1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 /*
  22  * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
  23  * Use is subject to license terms.
  24  */
  25 /*
  26  * Copyright 2011 Bayard G. Bell <buffer.g.overflow@gmail.com>.
  27  * All rights reserved. Use is subject to license terms.
  28  * Copyright 2020 Joyent, Inc.
  29  */
  30 
  31 /*
  32  * Kernel's linker/loader
  33  */
  34 
  35 #include <sys/types.h>
  36 #include <sys/param.h>
  37 #include <sys/sysmacros.h>
  38 #include <sys/systm.h>
  39 #include <sys/user.h>
  40 #include <sys/kmem.h>
  41 #include <sys/reboot.h>
  42 #include <sys/bootconf.h>
  43 #include <sys/debug.h>
  44 #include <sys/uio.h>
  45 #include <sys/file.h>
  46 #include <sys/vnode.h>
  47 #include <sys/user.h>
  48 #include <sys/mman.h>
  49 #include <vm/as.h>
  50 #include <vm/seg_kp.h>
  51 #include <vm/seg_kmem.h>
  52 #include <sys/elf.h>
  53 #include <sys/elf_notes.h>
  54 #include <sys/vmsystm.h>
  55 #include <sys/kdi.h>
  56 #include <sys/atomic.h>
  57 #include <sys/kmdb.h>
  58 
  59 #include <sys/link.h>
  60 #include <sys/kobj.h>
  61 #include <sys/ksyms.h>
  62 #include <sys/disp.h>
  63 #include <sys/modctl.h>
  64 #include <sys/varargs.h>
  65 #include <sys/kstat.h>
  66 #include <sys/kobj_impl.h>
  67 #include <sys/fs/decomp.h>
  68 #include <sys/callb.h>
  69 #include <sys/cmn_err.h>
  70 #include <sys/tnf_probe.h>
  71 #include <sys/zmod.h>
  72 
  73 #include <krtld/reloc.h>
  74 #include <krtld/kobj_kdi.h>
  75 #include <sys/sha1.h>
  76 #include <sys/crypto/elfsign.h>
  77 
  78 #if !defined(_OBP)
  79 #include <sys/bootvfs.h>
  80 #endif
  81 
  82 /*
  83  * do_symbols() error codes
  84  */
  85 #define DOSYM_UNDEF             -1      /* undefined symbol */
  86 #define DOSYM_UNSAFE            -2      /* MT-unsafe driver symbol */
  87 
  88 #if !defined(_OBP)
  89 static void synthetic_bootaux(char *, val_t *);
  90 #endif
  91 
  92 static struct module *load_exec(val_t *, char *);
  93 static void load_linker(val_t *);
  94 static struct modctl *add_primary(const char *filename, int);
  95 static int bind_primary(val_t *, int);
  96 static int load_primary(struct module *, int);
  97 static int load_kmdb(val_t *);
  98 static int get_progbits(struct module *, struct _buf *);
  99 static int get_syms(struct module *, struct _buf *);
 100 static int get_ctf(struct module *, struct _buf *);
 101 static void get_signature(struct module *, struct _buf *);
 102 static int do_common(struct module *);
 103 static void add_dependent(struct module *, struct module *);
 104 static int do_dependents(struct modctl *, char *, size_t);
 105 static int do_symbols(struct module *, Elf64_Addr);
 106 static void module_assign(struct modctl *, struct module *);
 107 static void free_module_data(struct module *);
 108 static char *depends_on(struct module *);
 109 static char *getmodpath(const char *);
 110 static char *basename(char *);
 111 static void attr_val(val_t *);
 112 static char *find_libmacro(char *);
 113 static char *expand_libmacro(char *, char *, char *);
 114 static int read_bootflags(void);
 115 static int kobj_comp_setup(struct _buf *, struct compinfo *);
 116 static int kobj_uncomp_blk(struct _buf *, caddr_t, uint_t);
 117 static int kobj_read_blks(struct _buf *, caddr_t, uint_t, uint_t);
 118 static int kobj_boot_open(char *, int);
 119 static int kobj_boot_close(int);
 120 static int kobj_boot_seek(int, off_t, off_t);
 121 static int kobj_boot_read(int, caddr_t, size_t);
 122 static int kobj_boot_fstat(int, struct bootstat *);
 123 static int kobj_boot_compinfo(int, struct compinfo *);
 124 
 125 static Sym *lookup_one(struct module *, const char *);
 126 static void sym_insert(struct module *, char *, symid_t);
 127 static Sym *sym_lookup(struct module *, Sym *);
 128 
 129 static struct kobjopen_tctl *kobjopen_alloc(char *filename);
 130 static void kobjopen_free(struct kobjopen_tctl *ltp);
 131 static void kobjopen_thread(struct kobjopen_tctl *ltp);
 132 static int kobj_is_compressed(intptr_t);
 133 
 134 extern int kcopy(const void *, void *, size_t);
 135 extern int elf_mach_ok(Ehdr *);
 136 extern int alloc_gottable(struct module *, caddr_t *, caddr_t *);
 137 
 138 #if !defined(_OBP)
 139 extern int kobj_boot_mountroot(void);
 140 #endif
 141 
 142 static void tnf_unsplice_probes(uint_t, struct modctl *);
 143 extern tnf_probe_control_t *__tnf_probe_list_head;
 144 extern tnf_tag_data_t *__tnf_tag_list_head;
 145 
 146 extern int modrootloaded;
 147 extern int swaploaded;
 148 extern int bop_io_quiesced;
 149 extern int last_module_id;
 150 
 151 extern char stubs_base[];
 152 extern char stubs_end[];
 153 
 154 #ifdef KOBJ_DEBUG
 155 /*
 156  * Values that can be or'd in to kobj_debug and their effects:
 157  *
 158  *      D_DEBUG         - misc. debugging information.
 159  *      D_SYMBOLS       - list symbols and their values as they are entered
 160  *                        into the hash table
 161  *      D_RELOCATIONS   - display relocation processing information
 162  *      D_LOADING       - display information about each module as it
 163  *                        is loaded.
 164  */
 165 int kobj_debug = 0;
 166 
 167 #define KOBJ_MARK(s)    if (kobj_debug & D_DEBUG)   \
 168         (_kobj_printf(ops, "%d", __LINE__), _kobj_printf(ops, ": %s\n", s))
 169 #else
 170 #define KOBJ_MARK(s)    /* discard */
 171 #endif
 172 
 173 #define MODPATH_PROPNAME        "module-path"
 174 
 175 #ifdef MODDIR_SUFFIX
 176 static char slash_moddir_suffix_slash[] = MODDIR_SUFFIX "/";
 177 #else
 178 #define slash_moddir_suffix_slash       ""
 179 #endif
 180 
 181 #define _moddebug       get_weakish_int(&moddebug)
 182 #define _modrootloaded  get_weakish_int(&modrootloaded)
 183 #define _swaploaded     get_weakish_int(&swaploaded)
 184 #define _ioquiesced     get_weakish_int(&bop_io_quiesced)
 185 
 186 #define mod(X)          (struct module *)((X)->modl_modp->mod_mp)
 187 
 188 void    *romp;          /* rom vector (opaque to us) */
 189 struct bootops *ops;    /* bootops vector */
 190 void *dbvec;            /* debug vector */
 191 
 192 /*
 193  * kobjopen thread control structure
 194  */
 195 struct kobjopen_tctl {
 196         ksema_t         sema;
 197         char            *name;          /* name of file */
 198         struct vnode    *vp;            /* vnode return from vn_open() */
 199         int             Errno;          /* error return from vnopen    */
 200 };
 201 
 202 /*
 203  * Structure for defining dynamically expandable library macros
 204  */
 205 
 206 struct lib_macro_info {
 207         char    *lmi_list;              /* ptr to list of possible choices */
 208         char    *lmi_macroname;         /* pointer to macro name */
 209         ushort_t lmi_ba_index;          /* index into bootaux vector */
 210         ushort_t lmi_macrolen;          /* macro length */
 211 } libmacros[] = {
 212         { NULL, "CPU", BA_CPU, 0 },
 213         { NULL, "MMU", BA_MMU, 0 }
 214 };
 215 
 216 #define NLIBMACROS      sizeof (libmacros) / sizeof (struct lib_macro_info)
 217 
 218 char *boot_cpu_compatible_list;                 /* make $CPU available */
 219 
 220 char *kobj_module_path;                         /* module search path */
 221 vmem_t  *text_arena;                            /* module text arena */
 222 static vmem_t *data_arena;                      /* module data & bss arena */
 223 static vmem_t *ctf_arena;                       /* CTF debug data arena */
 224 static struct modctl *kobj_modules = NULL;      /* modules loaded */
 225 int kobj_mmu_pagesize;                          /* system pagesize */
 226 static int lg_pagesize;                         /* "large" pagesize */
 227 static int kobj_last_module_id = 0;             /* id assignment */
 228 static kmutex_t kobj_lock;                      /* protects mach memory list */
 229 
 230 /*
 231  * The following functions have been implemented by the kernel.
 232  * However, many 3rd party drivers provide their own implementations
 233  * of these functions.  When such drivers are loaded, messages
 234  * indicating that these symbols have been multiply defined will be
 235  * emitted to the console.  To avoid alarming customers for no good
 236  * reason, we simply suppress such warnings for the following set of
 237  * functions.
 238  */
 239 static char *suppress_sym_list[] =
 240 {
 241         "strstr",
 242         "strncat",
 243         "strlcat",
 244         "strlcpy",
 245         "strspn",
 246         "memcpy",
 247         "memset",
 248         "memmove",
 249         "memcmp",
 250         "memchr",
 251         "__udivdi3",
 252         "__divdi3",
 253         "__umoddi3",
 254         "__moddi3",
 255         NULL            /* This entry must exist */
 256 };
 257 
 258 /* indexed by KOBJ_NOTIFY_* */
 259 static kobj_notify_list_t *kobj_notifiers[KOBJ_NOTIFY_MAX + 1];
 260 
 261 /*
 262  * TNF probe management globals
 263  */
 264 tnf_probe_control_t     *__tnf_probe_list_head = NULL;
 265 tnf_tag_data_t          *__tnf_tag_list_head = NULL;
 266 int                     tnf_changed_probe_list = 0;
 267 
 268 /*
 269  * Prefix for statically defined tracing (SDT) DTrace probes.
 270  */
 271 const char              *sdt_prefix = "__dtrace_probe_";
 272 
 273 /*
 274  * Beginning and end of the kernel's dynamic text/data segments.
 275  */
 276 static caddr_t _text;
 277 static caddr_t _etext;
 278 static caddr_t _data;
 279 
 280 /*
 281  * The sparc linker doesn't create a memory location
 282  * for a variable named _edata, so _edata can only be
 283  * referred to, not modified.  krtld needs a static
 284  * variable to modify it - within krtld, of course -
 285  * outside of krtld, e_data is used in all kernels.
 286  */
 287 #if defined(__sparc)
 288 static caddr_t _edata;
 289 #else
 290 extern caddr_t _edata;
 291 #endif
 292 
 293 Addr dynseg = 0;        /* load address of "dynamic" segment */
 294 size_t dynsize;         /* "dynamic" segment size */
 295 
 296 
 297 int standalone = 1;                     /* an unwholey kernel? */
 298 int use_iflush;                         /* iflush after relocations */
 299 
 300 /*
 301  * _kobj_printf() and _vkobj_printf()
 302  *
 303  * Common printf function pointer. Can handle only one conversion
 304  * specification in the format string. Some of the functions invoked
 305  * through this function pointer cannot handle more that one conversion
 306  * specification in the format string.
 307  */
 308 void (*_kobj_printf)(void *, const char *, ...) __KPRINTFLIKE(2);
 309 void (*_vkobj_printf)(void *, const char *, va_list) __KVPRINTFLIKE(2);
 310 
 311 /*
 312  * Standalone function pointers for use within krtld.
 313  * Many platforms implement optimized platmod versions of
 314  * utilities such as bcopy and any such are not yet available
 315  * until the kernel is more completely stitched together.
 316  * See kobj_impl.h
 317  */
 318 void (*kobj_bcopy)(const void *, void *, size_t);
 319 void (*kobj_bzero)(void *, size_t);
 320 size_t (*kobj_strlcat)(char *, const char *, size_t);
 321 
 322 static kobj_stat_t kobj_stat;
 323 
 324 #define MINALIGN        8       /* at least a double-word */
 325 
 326 int
 327 get_weakish_int(int *ip)
 328 {
 329         if (standalone)
 330                 return (0);
 331         return (ip == NULL ? 0 : *ip);
 332 }
 333 
 334 static void *
 335 get_weakish_pointer(void **ptrp)
 336 {
 337         if (standalone)
 338                 return (0);
 339         return (ptrp == NULL ? 0 : *ptrp);
 340 }
 341 
 342 /*
 343  * XXX fix dependencies on "kernel"; this should work
 344  * for other standalone binaries as well.
 345  *
 346  * XXX Fix hashing code to use one pointer to
 347  * hash entries.
 348  *      |----------|
 349  *      | nbuckets |
 350  *      |----------|
 351  *      | nchains  |
 352  *      |----------|
 353  *      | bucket[] |
 354  *      |----------|
 355  *      | chain[]  |
 356  *      |----------|
 357  */
 358 
 359 /*
 360  * Load, bind and relocate all modules that
 361  * form the primary kernel. At this point, our
 362  * externals have not been relocated.
 363  */
 364 void
 365 kobj_init(
 366         void *romvec,
 367         void *dvec,
 368         struct bootops *bootvec,
 369         val_t *bootaux)
 370 {
 371         struct module *mp;
 372         struct modctl *modp;
 373         Addr entry;
 374         char filename[MAXPATHLEN];
 375 
 376         /*
 377          * Save these to pass on to
 378          * the booted standalone.
 379          */
 380         romp = romvec;
 381         dbvec = dvec;
 382 
 383         ops = bootvec;
 384         kobj_setup_standalone_vectors();
 385 
 386         KOBJ_MARK("Entered kobj_init()");
 387 
 388         (void) BOP_GETPROP(ops, "whoami", filename);
 389 
 390         /*
 391          * We don't support standalone debuggers anymore.  The use of kadb
 392          * will interfere with the later use of kmdb.  Let the user mend
 393          * their ways now.  Users will reach this message if they still
 394          * have the kadb binary on their system (perhaps they used an old
 395          * bfu, or maybe they intentionally copied it there) and have
 396          * specified its use in a way that eluded our checking in the boot
 397          * program.
 398          */
 399         if (dvec != NULL) {
 400                 _kobj_printf(ops, "\nWARNING: Standalone debuggers such as "
 401                     "kadb are no longer supported\n\n");
 402                 goto fail;
 403         }
 404 
 405 #if defined(_OBP)
 406         /*
 407          * OBP allows us to read both the ramdisk and
 408          * the underlying root fs when root is a disk.
 409          * This can lower incidences of unbootable systems
 410          * when the archive is out-of-date with the /etc
 411          * state files.
 412          */
 413         if (BOP_MOUNTROOT() != BOOT_SVC_OK) {
 414                 _kobj_printf(ops, "can't mount boot fs\n");
 415                 goto fail;
 416         }
 417 #else
 418         {
 419                 /* on x86, we always boot with a ramdisk */
 420                 (void) kobj_boot_mountroot();
 421 
 422                 /*
 423                  * Now that the ramdisk is mounted, finish boot property
 424                  * initialization.
 425                  */
 426                 read_bootenvrc();
 427         }
 428 
 429 #if !defined(_UNIX_KRTLD)
 430         /*
 431          * 'unix' is linked together with 'krtld' into one executable and
 432          * the early boot code does -not- hand us any of the dynamic metadata
 433          * about the executable. In particular, it does not read in, map or
 434          * otherwise look at the program headers. We fake all that up now.
 435          *
 436          * We do this early as DTrace static probes and tnf probes both call
 437          * undefined references.  We have to process those relocations before
 438          * calling any of them.
 439          *
 440          * OBP tells kobj_start() where the ELF image is in memory, so it
 441          * synthesized bootaux before kobj_init() was called
 442          */
 443         if (bootaux[BA_PHDR].ba_ptr == NULL)
 444                 synthetic_bootaux(filename, bootaux);
 445 
 446 #endif  /* !_UNIX_KRTLD */
 447 #endif  /* _OBP */
 448 
 449         /*
 450          * Save the interesting attribute-values
 451          * (scanned by kobj_boot).
 452          */
 453         attr_val(bootaux);
 454 
 455         /*
 456          * Set the module search path.
 457          */
 458         kobj_module_path = getmodpath(filename);
 459 
 460         boot_cpu_compatible_list = find_libmacro("CPU");
 461 
 462         /*
 463          * These two modules have actually been
 464          * loaded by boot, but we finish the job
 465          * by introducing them into the world of
 466          * loadable modules.
 467          */
 468 
 469         mp = load_exec(bootaux, filename);
 470         load_linker(bootaux);
 471 
 472         /*
 473          * Load all the primary dependent modules.
 474          */
 475         if (load_primary(mp, KOBJ_LM_PRIMARY) == -1)
 476                 goto fail;
 477 
 478         /*
 479          * Glue it together.
 480          */
 481         if (bind_primary(bootaux, KOBJ_LM_PRIMARY) == -1)
 482                 goto fail;
 483 
 484         entry = bootaux[BA_ENTRY].ba_val;
 485 
 486         /*
 487          * Get the boot flags
 488          */
 489         bootflags(ops);
 490 
 491         if (boothowto & RB_VERBOSE)
 492                 kobj_lm_dump(KOBJ_LM_PRIMARY);
 493 
 494         kobj_kdi_init();
 495 
 496         if (boothowto & RB_KMDB) {
 497                 if (load_kmdb(bootaux) < 0)
 498                         goto fail;
 499         }
 500 
 501         /*
 502          * Post setup.
 503          */
 504         s_text = _text;
 505         e_text = _etext;
 506         s_data = _data;
 507         e_data = _edata;
 508 
 509         kobj_sync_instruction_memory(s_text, e_text - s_text);
 510 
 511 #ifdef  KOBJ_DEBUG
 512         if (kobj_debug & D_DEBUG)
 513                 _kobj_printf(ops,
 514                     "krtld: transferring control to: 0x%lx\n", entry);
 515 #endif
 516 
 517         /*
 518          * Make sure the mod system knows about the modules already loaded.
 519          */
 520         last_module_id = kobj_last_module_id;
 521         bcopy(kobj_modules, &modules, sizeof (modules));
 522         modp = &modules;
 523         do {
 524                 if (modp->mod_next == kobj_modules)
 525                         modp->mod_next = &modules;
 526                 if (modp->mod_prev == kobj_modules)
 527                         modp->mod_prev = &modules;
 528         } while ((modp = modp->mod_next) != &modules);
 529 
 530         standalone = 0;
 531 
 532 #ifdef  KOBJ_DEBUG
 533         if (kobj_debug & D_DEBUG)
 534                 _kobj_printf(ops,
 535                     "krtld: really transferring control to: 0x%lx\n", entry);
 536 #endif
 537 
 538         /* restore printf/bcopy/bzero vectors before returning */
 539         kobj_restore_vectors();
 540 
 541 #if defined(_DBOOT)
 542         /*
 543          * krtld was called from a dboot ELF section, the embedded
 544          * dboot code contains the real entry via bootaux
 545          */
 546         exitto((caddr_t)entry);
 547 #else
 548         /*
 549          * krtld was directly called from startup
 550          */
 551         return;
 552 #endif
 553 
 554 fail:
 555 
 556         _kobj_printf(ops, "krtld: error during initial load/link phase\n");
 557 
 558 #if !defined(_UNIX_KRTLD)
 559         _kobj_printf(ops, "\n");
 560         _kobj_printf(ops, "krtld could neither locate nor resolve symbols"
 561             " for:\n");
 562         _kobj_printf(ops, "    %s\n", filename);
 563         _kobj_printf(ops, "in the boot archive. Please verify that this"
 564             " file\n");
 565         _kobj_printf(ops, "matches what is found in the boot archive.\n");
 566         _kobj_printf(ops, "You may need to boot using the Solaris failsafe to"
 567             " fix this.\n");
 568         bop_panic("Unable to boot");
 569 #endif
 570 }
 571 
 572 #if !defined(_UNIX_KRTLD) && !defined(_OBP)
 573 /*
 574  * Synthesize additional metadata that describes the executable if
 575  * krtld's caller didn't do it.
 576  *
 577  * (When the dynamic executable has an interpreter, the boot program
 578  * does all this for us.  Where we don't have an interpreter, (or a
 579  * even a boot program, perhaps) we have to do this for ourselves.)
 580  */
 581 static void
 582 synthetic_bootaux(char *filename, val_t *bootaux)
 583 {
 584         Ehdr ehdr;
 585         caddr_t phdrbase;
 586         struct _buf *file;
 587         int i, n;
 588 
 589         /*
 590          * Elf header
 591          */
 592         KOBJ_MARK("synthetic_bootaux()");
 593         KOBJ_MARK(filename);
 594         file = kobj_open_file(filename);
 595         if (file == (struct _buf *)-1) {
 596                 _kobj_printf(ops, "krtld: failed to open '%s'\n", filename);
 597                 return;
 598         }
 599         KOBJ_MARK("reading program headers");
 600         if (kobj_read_file(file, (char *)&ehdr, sizeof (ehdr), 0) < 0) {
 601                 _kobj_printf(ops, "krtld: %s: failed to read ehder\n",
 602                     filename);
 603                 return;
 604         }
 605 
 606         /*
 607          * Program headers
 608          */
 609         bootaux[BA_PHNUM].ba_val = ehdr.e_phnum;
 610         bootaux[BA_PHENT].ba_val = ehdr.e_phentsize;
 611         n = ehdr.e_phentsize * ehdr.e_phnum;
 612 
 613         phdrbase = kobj_alloc(n, KM_WAIT | KM_TMP);
 614 
 615         if (kobj_read_file(file, phdrbase, n, ehdr.e_phoff) < 0) {
 616                 _kobj_printf(ops, "krtld: %s: failed to read phdrs\n",
 617                     filename);
 618                 return;
 619         }
 620         bootaux[BA_PHDR].ba_ptr = phdrbase;
 621         kobj_close_file(file);
 622         KOBJ_MARK("closed file");
 623 
 624         /*
 625          * Find the dynamic section address
 626          */
 627         for (i = 0; i < ehdr.e_phnum; i++) {
 628                 Phdr *phdr = (Phdr *)(phdrbase + ehdr.e_phentsize * i);
 629 
 630                 if (phdr->p_type == PT_DYNAMIC) {
 631                         bootaux[BA_DYNAMIC].ba_ptr = (void *)phdr->p_vaddr;
 632                         break;
 633                 }
 634         }
 635         KOBJ_MARK("synthetic_bootaux() done");
 636 }
 637 #endif  /* !_UNIX_KRTLD && !_OBP */
 638 
 639 /*
 640  * Set up any global information derived
 641  * from attribute/values in the boot or
 642  * aux vector.
 643  */
 644 static void
 645 attr_val(val_t *bootaux)
 646 {
 647         Phdr *phdr;
 648         int phnum, phsize;
 649         int i;
 650 
 651         KOBJ_MARK("attr_val()");
 652         kobj_mmu_pagesize = bootaux[BA_PAGESZ].ba_val;
 653         lg_pagesize = bootaux[BA_LPAGESZ].ba_val;
 654         use_iflush = bootaux[BA_IFLUSH].ba_val;
 655 
 656         phdr = (Phdr *)bootaux[BA_PHDR].ba_ptr;
 657         phnum = bootaux[BA_PHNUM].ba_val;
 658         phsize = bootaux[BA_PHENT].ba_val;
 659         for (i = 0; i < phnum; i++) {
 660                 phdr = (Phdr *)(bootaux[BA_PHDR].ba_val + i * phsize);
 661 
 662                 if (phdr->p_type != PT_LOAD) {
 663                         continue;
 664                 }
 665                 /*
 666                  * Bounds of the various segments.
 667                  */
 668                 if (!(phdr->p_flags & PF_X)) {
 669 #if defined(_RELSEG)
 670                         /*
 671                          * sparc kernel puts the dynamic info
 672                          * into a separate segment, which is
 673                          * free'd in bop_fini()
 674                          */
 675                         ASSERT(phdr->p_vaddr != 0);
 676                         dynseg = phdr->p_vaddr;
 677                         dynsize = phdr->p_memsz;
 678 #else
 679                         ASSERT(phdr->p_vaddr == 0);
 680 #endif
 681                 } else {
 682                         if (phdr->p_flags & PF_W) {
 683                                 _data = (caddr_t)phdr->p_vaddr;
 684                                 _edata = _data + phdr->p_memsz;
 685                         } else {
 686                                 _text = (caddr_t)phdr->p_vaddr;
 687                                 _etext = _text + phdr->p_memsz;
 688                         }
 689                 }
 690         }
 691 
 692         /* To do the kobj_alloc, _edata needs to be set. */
 693         for (i = 0; i < NLIBMACROS; i++) {
 694                 if (bootaux[libmacros[i].lmi_ba_index].ba_ptr != NULL) {
 695                         libmacros[i].lmi_list = kobj_alloc(
 696                             strlen(bootaux[libmacros[i].lmi_ba_index].ba_ptr) +
 697                             1, KM_WAIT);
 698                         (void) strcpy(libmacros[i].lmi_list,
 699                             bootaux[libmacros[i].lmi_ba_index].ba_ptr);
 700                 }
 701                 libmacros[i].lmi_macrolen = strlen(libmacros[i].lmi_macroname);
 702         }
 703 }
 704 
 705 /*
 706  * Set up the booted executable.
 707  */
 708 static struct module *
 709 load_exec(val_t *bootaux, char *filename)
 710 {
 711         struct modctl *cp;
 712         struct module *mp;
 713         Dyn *dyn;
 714         Sym *sp;
 715         int i, lsize, osize, nsize, allocsize;
 716         char *libname, *tmp;
 717         char path[MAXPATHLEN];
 718 
 719 #ifdef KOBJ_DEBUG
 720         if (kobj_debug & D_DEBUG)
 721                 _kobj_printf(ops, "module path '%s'\n", kobj_module_path);
 722 #endif
 723 
 724         KOBJ_MARK("add_primary");
 725         cp = add_primary(filename, KOBJ_LM_PRIMARY);
 726 
 727         KOBJ_MARK("struct module");
 728         mp = kobj_zalloc(sizeof (struct module), KM_WAIT);
 729         cp->mod_mp = mp;
 730 
 731         /*
 732          * We don't have the following information
 733          * since this module is an executable and not
 734          * a relocatable .o.
 735          */
 736         mp->symtbl_section = 0;
 737         mp->shdrs = NULL;
 738         mp->strhdr = NULL;
 739 
 740         /*
 741          * Since this module is the only exception,
 742          * we cons up some section headers.
 743          */
 744         KOBJ_MARK("symhdr");
 745         mp->symhdr = kobj_zalloc(sizeof (Shdr), KM_WAIT);
 746 
 747         KOBJ_MARK("strhdr");
 748         mp->strhdr = kobj_zalloc(sizeof (Shdr), KM_WAIT);
 749 
 750         mp->symhdr->sh_type = SHT_SYMTAB;
 751         mp->strhdr->sh_type = SHT_STRTAB;
 752         /*
 753          * Scan the dynamic structure.
 754          */
 755         for (dyn = (Dyn *) bootaux[BA_DYNAMIC].ba_ptr;
 756             dyn->d_tag != DT_NULL; dyn++) {
 757                 switch (dyn->d_tag) {
 758                 case DT_SYMTAB:
 759                         mp->symspace = mp->symtbl = (char *)dyn->d_un.d_ptr;
 760                         mp->symhdr->sh_addr = dyn->d_un.d_ptr;
 761                         break;
 762                 case DT_HASH:
 763                         mp->nsyms = *((uint_t *)dyn->d_un.d_ptr + 1);
 764                         mp->hashsize = *(uint_t *)dyn->d_un.d_ptr;
 765                         break;
 766                 case DT_STRTAB:
 767                         mp->strings = (char *)dyn->d_un.d_ptr;
 768                         mp->strhdr->sh_addr = dyn->d_un.d_ptr;
 769                         break;
 770                 case DT_STRSZ:
 771                         mp->strhdr->sh_size = dyn->d_un.d_val;
 772                         break;
 773                 case DT_SYMENT:
 774                         mp->symhdr->sh_entsize = dyn->d_un.d_val;
 775                         break;
 776                 }
 777         }
 778 
 779         /*
 780          * Collapse any DT_NEEDED entries into one string.
 781          */
 782         nsize = osize = 0;
 783         allocsize = MAXPATHLEN;
 784 
 785         KOBJ_MARK("depends_on");
 786         mp->depends_on = kobj_alloc(allocsize, KM_WAIT);
 787 
 788         for (dyn = (Dyn *) bootaux[BA_DYNAMIC].ba_ptr;
 789             dyn->d_tag != DT_NULL; dyn++)
 790                 if (dyn->d_tag == DT_NEEDED) {
 791                         char *_lib;
 792 
 793                         libname = mp->strings + dyn->d_un.d_val;
 794                         if (strchr(libname, '$') != NULL) {
 795                                 if ((_lib = expand_libmacro(libname,
 796                                     path, path)) != NULL)
 797                                         libname = _lib;
 798                                 else
 799                                         _kobj_printf(ops, "krtld: "
 800                                             "load_exec: fail to "
 801                                             "expand %s\n", libname);
 802                         }
 803                         lsize = strlen(libname);
 804                         nsize += lsize;
 805                         if (nsize + 1 > allocsize) {
 806                                 KOBJ_MARK("grow depends_on");
 807                                 tmp = kobj_alloc(allocsize + MAXPATHLEN,
 808                                     KM_WAIT);
 809                                 bcopy(mp->depends_on, tmp, osize);
 810                                 kobj_free(mp->depends_on, allocsize);
 811                                 mp->depends_on = tmp;
 812                                 allocsize += MAXPATHLEN;
 813                         }
 814                         bcopy(libname, mp->depends_on + osize, lsize);
 815                         *(mp->depends_on + nsize) = ' '; /* separate */
 816                         nsize++;
 817                         osize = nsize;
 818                 }
 819         if (nsize) {
 820                 mp->depends_on[nsize - 1] = '\0'; /* terminate the string */
 821                 /*
 822                  * alloc with exact size and copy whatever it got over
 823                  */
 824                 KOBJ_MARK("realloc depends_on");
 825                 tmp = kobj_alloc(nsize, KM_WAIT);
 826                 bcopy(mp->depends_on, tmp, nsize);
 827                 kobj_free(mp->depends_on, allocsize);
 828                 mp->depends_on = tmp;
 829         } else {
 830                 kobj_free(mp->depends_on, allocsize);
 831                 mp->depends_on = NULL;
 832         }
 833 
 834         mp->flags = KOBJ_EXEC|KOBJ_PRIM;     /* NOT a relocatable .o */
 835         mp->symhdr->sh_size = mp->nsyms * mp->symhdr->sh_entsize;
 836         /*
 837          * We allocate our own table since we don't
 838          * hash undefined references.
 839          */
 840         KOBJ_MARK("chains");
 841         mp->chains = kobj_zalloc(mp->nsyms * sizeof (symid_t), KM_WAIT);
 842         KOBJ_MARK("buckets");
 843         mp->buckets = kobj_zalloc(mp->hashsize * sizeof (symid_t), KM_WAIT);
 844 
 845         mp->text = _text;
 846         mp->data = _data;
 847 
 848         mp->text_size = _etext - _text;
 849         mp->data_size = _edata - _data;
 850 
 851         cp->mod_text = mp->text;
 852         cp->mod_text_size = mp->text_size;
 853 
 854         mp->filename = cp->mod_filename;
 855 
 856 #ifdef  KOBJ_DEBUG
 857         if (kobj_debug & D_LOADING) {
 858                 _kobj_printf(ops, "krtld: file=%s\n", mp->filename);
 859                 _kobj_printf(ops, "\ttext: 0x%p", mp->text);
 860                 _kobj_printf(ops, " size: 0x%lx\n", mp->text_size);
 861                 _kobj_printf(ops, "\tdata: 0x%p", mp->data);
 862                 _kobj_printf(ops, " dsize: 0x%lx\n", mp->data_size);
 863         }
 864 #endif /* KOBJ_DEBUG */
 865 
 866         /*
 867          * Insert symbols into the hash table.
 868          */
 869         for (i = 0; i < mp->nsyms; i++) {
 870                 sp = (Sym *)(mp->symtbl + i * mp->symhdr->sh_entsize);
 871 
 872                 if (sp->st_name == 0 || sp->st_shndx == SHN_UNDEF)
 873                         continue;
 874 #if defined(__sparc)
 875                 /*
 876                  * Register symbols are ignored in the kernel
 877                  */
 878                 if (ELF_ST_TYPE(sp->st_info) == STT_SPARC_REGISTER)
 879                         continue;
 880 #endif  /* __sparc */
 881 
 882                 sym_insert(mp, mp->strings + sp->st_name, i);
 883         }
 884 
 885         KOBJ_MARK("load_exec done");
 886         return (mp);
 887 }
 888 
 889 /*
 890  * Set up the linker module (if it's compiled in, LDNAME is NULL)
 891  */
 892 static void
 893 load_linker(val_t *bootaux)
 894 {
 895         struct module *kmp = (struct module *)kobj_modules->mod_mp;
 896         struct module *mp;
 897         struct modctl *cp;
 898         int i;
 899         Shdr *shp;
 900         Sym *sp;
 901         int shsize;
 902         char *dlname = (char *)bootaux[BA_LDNAME].ba_ptr;
 903 
 904         /*
 905          * On some architectures, krtld is compiled into the kernel.
 906          */
 907         if (dlname == NULL)
 908                 return;
 909 
 910         cp = add_primary(dlname, KOBJ_LM_PRIMARY);
 911 
 912         mp = kobj_zalloc(sizeof (struct module), KM_WAIT);
 913 
 914         cp->mod_mp = mp;
 915         mp->hdr = *(Ehdr *)bootaux[BA_LDELF].ba_ptr;
 916         shsize = mp->hdr.e_shentsize * mp->hdr.e_shnum;
 917         mp->shdrs = kobj_alloc(shsize, KM_WAIT);
 918         bcopy(bootaux[BA_LDSHDR].ba_ptr, mp->shdrs, shsize);
 919 
 920         for (i = 1; i < (int)mp->hdr.e_shnum; i++) {
 921                 shp = (Shdr *)(mp->shdrs + (i * mp->hdr.e_shentsize));
 922 
 923                 if (shp->sh_flags & SHF_ALLOC) {
 924                         if (shp->sh_flags & SHF_WRITE) {
 925                                 if (mp->data == NULL)
 926                                         mp->data = (char *)shp->sh_addr;
 927                         } else if (mp->text == NULL) {
 928                                 mp->text = (char *)shp->sh_addr;
 929                         }
 930                 }
 931                 if (shp->sh_type == SHT_SYMTAB) {
 932                         mp->symtbl_section = i;
 933                         mp->symhdr = shp;
 934                         mp->symspace = mp->symtbl = (char *)shp->sh_addr;
 935                 }
 936         }
 937         mp->nsyms = mp->symhdr->sh_size / mp->symhdr->sh_entsize;
 938         mp->flags = KOBJ_INTERP|KOBJ_PRIM;
 939         mp->strhdr = (Shdr *)
 940             (mp->shdrs + mp->symhdr->sh_link * mp->hdr.e_shentsize);
 941         mp->strings = (char *)mp->strhdr->sh_addr;
 942         mp->hashsize = kobj_gethashsize(mp->nsyms);
 943 
 944         mp->symsize = mp->symhdr->sh_size + mp->strhdr->sh_size + sizeof (int) +
 945             (mp->hashsize + mp->nsyms) * sizeof (symid_t);
 946 
 947         mp->chains = kobj_zalloc(mp->nsyms * sizeof (symid_t), KM_WAIT);
 948         mp->buckets = kobj_zalloc(mp->hashsize * sizeof (symid_t), KM_WAIT);
 949 
 950         mp->bss = bootaux[BA_BSS].ba_val;
 951         mp->bss_align = 0;   /* pre-aligned during allocation */
 952         mp->bss_size = (uintptr_t)_edata - mp->bss;
 953         mp->text_size = _etext - mp->text;
 954         mp->data_size = _edata - mp->data;
 955         mp->filename = cp->mod_filename;
 956         cp->mod_text = mp->text;
 957         cp->mod_text_size = mp->text_size;
 958 
 959         /*
 960          * Now that we've figured out where the linker is,
 961          * set the limits for the booted object.
 962          */
 963         kmp->text_size = (size_t)(mp->text - kmp->text);
 964         kmp->data_size = (size_t)(mp->data - kmp->data);
 965         kobj_modules->mod_text_size = kmp->text_size;
 966 
 967 #ifdef  KOBJ_DEBUG
 968         if (kobj_debug & D_LOADING) {
 969                 _kobj_printf(ops, "krtld: file=%s\n", mp->filename);
 970                 _kobj_printf(ops, "\ttext:0x%p", mp->text);
 971                 _kobj_printf(ops, " size: 0x%lx\n", mp->text_size);
 972                 _kobj_printf(ops, "\tdata:0x%p", mp->data);
 973                 _kobj_printf(ops, " dsize: 0x%lx\n", mp->data_size);
 974         }
 975 #endif /* KOBJ_DEBUG */
 976 
 977         /*
 978          * Insert the symbols into the hash table.
 979          */
 980         for (i = 0; i < mp->nsyms; i++) {
 981                 sp = (Sym *)(mp->symtbl + i * mp->symhdr->sh_entsize);
 982 
 983                 if (sp->st_name == 0 || sp->st_shndx == SHN_UNDEF)
 984                         continue;
 985                 if (ELF_ST_BIND(sp->st_info) == STB_GLOBAL) {
 986                         if (sp->st_shndx == SHN_COMMON)
 987                                 sp->st_shndx = SHN_ABS;
 988                 }
 989                 sym_insert(mp, mp->strings + sp->st_name, i);
 990         }
 991 
 992 }
 993 
 994 static kobj_notify_list_t **
 995 kobj_notify_lookup(uint_t type)
 996 {
 997         ASSERT(type != 0 && type < sizeof (kobj_notifiers) /
 998             sizeof (kobj_notify_list_t *));
 999 
1000         return (&kobj_notifiers[type]);
1001 }
1002 
1003 int
1004 kobj_notify_add(kobj_notify_list_t *knp)
1005 {
1006         kobj_notify_list_t **knl;
1007 
1008         knl = kobj_notify_lookup(knp->kn_type);
1009 
1010         knp->kn_next = NULL;
1011         knp->kn_prev = NULL;
1012 
1013         mutex_enter(&kobj_lock);
1014 
1015         if (*knl != NULL) {
1016                 (*knl)->kn_prev = knp;
1017                 knp->kn_next = *knl;
1018         }
1019         (*knl) = knp;
1020 
1021         mutex_exit(&kobj_lock);
1022         return (0);
1023 }
1024 
1025 int
1026 kobj_notify_remove(kobj_notify_list_t *knp)
1027 {
1028         kobj_notify_list_t **knl = kobj_notify_lookup(knp->kn_type);
1029         kobj_notify_list_t *tknp;
1030 
1031         mutex_enter(&kobj_lock);
1032 
1033         /* LINTED */
1034         if (tknp = knp->kn_next)
1035                 tknp->kn_prev = knp->kn_prev;
1036 
1037         /* LINTED */
1038         if (tknp = knp->kn_prev)
1039                 tknp->kn_next = knp->kn_next;
1040         else
1041                 *knl = knp->kn_next;
1042 
1043         mutex_exit(&kobj_lock);
1044 
1045         return (0);
1046 }
1047 
1048 /*
1049  * Notify all interested callbacks of a specified change in module state.
1050  */
1051 static void
1052 kobj_notify(int type, struct modctl *modp)
1053 {
1054         kobj_notify_list_t *knp;
1055 
1056         if (modp->mod_loadflags & MOD_NONOTIFY || standalone)
1057                 return;
1058 
1059         mutex_enter(&kobj_lock);
1060 
1061         for (knp = *(kobj_notify_lookup(type)); knp != NULL; knp = knp->kn_next)
1062                 knp->kn_func(type, modp);
1063 
1064         /*
1065          * KDI notification must be last (it has to allow for work done by the
1066          * other notification callbacks), so we call it manually.
1067          */
1068         kobj_kdi_mod_notify(type, modp);
1069 
1070         mutex_exit(&kobj_lock);
1071 }
1072 
1073 /*
1074  * Create the module path.
1075  */
1076 static char *
1077 getmodpath(const char *filename)
1078 {
1079         char *path = kobj_zalloc(MAXPATHLEN, KM_WAIT);
1080 
1081         /*
1082          * Platform code gets first crack, then add
1083          * the default components
1084          */
1085         mach_modpath(path, filename);
1086         if (*path != '\0')
1087                 (void) strcat(path, " ");
1088         return (strcat(path, MOD_DEFPATH));
1089 }
1090 
1091 static struct modctl *
1092 add_primary(const char *filename, int lmid)
1093 {
1094         struct modctl *cp;
1095 
1096         cp = kobj_zalloc(sizeof (struct modctl), KM_WAIT);
1097 
1098         cp->mod_filename = kobj_alloc(strlen(filename) + 1, KM_WAIT);
1099 
1100         /*
1101          * For symbol lookup, we assemble our own
1102          * modctl list of the primary modules.
1103          */
1104 
1105         (void) strcpy(cp->mod_filename, filename);
1106         cp->mod_modname = basename(cp->mod_filename);
1107 
1108         /* set values for modinfo assuming that the load will work */
1109         cp->mod_prim = 1;
1110         cp->mod_loaded = 1;
1111         cp->mod_installed = 1;
1112         cp->mod_loadcnt = 1;
1113         cp->mod_loadflags = MOD_NOAUTOUNLOAD;
1114 
1115         cp->mod_id = kobj_last_module_id++;
1116 
1117         /*
1118          * Link the module in. We'll pass this info on
1119          * to the mod squad later.
1120          */
1121         if (kobj_modules == NULL) {
1122                 kobj_modules = cp;
1123                 cp->mod_prev = cp->mod_next = cp;
1124         } else {
1125                 cp->mod_prev = kobj_modules->mod_prev;
1126                 cp->mod_next = kobj_modules;
1127                 kobj_modules->mod_prev->mod_next = cp;
1128                 kobj_modules->mod_prev = cp;
1129         }
1130 
1131         kobj_lm_append(lmid, cp);
1132 
1133         return (cp);
1134 }
1135 
1136 static int
1137 bind_primary(val_t *bootaux, int lmid)
1138 {
1139         struct modctl_list *linkmap = kobj_lm_lookup(lmid);
1140         struct modctl_list *lp;
1141         struct module *mp;
1142 
1143         /*
1144          * Do common symbols.
1145          */
1146         for (lp = linkmap; lp; lp = lp->modl_next) {
1147                 mp = mod(lp);
1148 
1149                 /*
1150                  * Don't do common section relocations for modules that
1151                  * don't need it.
1152                  */
1153                 if (mp->flags & (KOBJ_EXEC|KOBJ_INTERP))
1154                         continue;
1155 
1156                 if (do_common(mp) < 0)
1157                         return (-1);
1158         }
1159 
1160         /*
1161          * Resolve symbols.
1162          */
1163         for (lp = linkmap; lp; lp = lp->modl_next) {
1164                 mp = mod(lp);
1165 
1166                 if (do_symbols(mp, 0) < 0)
1167                         return (-1);
1168         }
1169 
1170         /*
1171          * Do relocations.
1172          */
1173         for (lp = linkmap; lp; lp = lp->modl_next) {
1174                 mp = mod(lp);
1175 
1176                 if (mp->flags & KOBJ_EXEC) {
1177                         Dyn *dyn;
1178                         Word relasz = 0, relaent = 0;
1179                         char *rela = NULL;
1180 
1181                         for (dyn = (Dyn *)bootaux[BA_DYNAMIC].ba_ptr;
1182                             dyn->d_tag != DT_NULL; dyn++) {
1183                                 switch (dyn->d_tag) {
1184                                 case DT_RELASZ:
1185                                 case DT_RELSZ:
1186                                         relasz = dyn->d_un.d_val;
1187                                         break;
1188                                 case DT_RELAENT:
1189                                 case DT_RELENT:
1190                                         relaent = dyn->d_un.d_val;
1191                                         break;
1192                                 case DT_RELA:
1193                                         rela = (char *)dyn->d_un.d_ptr;
1194                                         break;
1195                                 case DT_REL:
1196                                         rela = (char *)dyn->d_un.d_ptr;
1197                                         break;
1198                                 }
1199                         }
1200                         if (relasz == 0 ||
1201                             relaent == 0 || rela == NULL) {
1202                                 _kobj_printf(ops, "krtld: bind_primary(): "
1203                                     "no relocation information found for "
1204                                     "module %s\n", mp->filename);
1205                                 return (-1);
1206                         }
1207 #ifdef  KOBJ_DEBUG
1208                         if (kobj_debug & D_RELOCATIONS)
1209                                 _kobj_printf(ops, "krtld: relocating: file=%s "
1210                                     "KOBJ_EXEC\n", mp->filename);
1211 #endif
1212                         if (do_relocate(mp, rela, relasz/relaent, relaent,
1213                             (Addr)mp->text) < 0)
1214                                 return (-1);
1215                 } else {
1216                         if (do_relocations(mp) < 0)
1217                                 return (-1);
1218                 }
1219 
1220                 kobj_sync_instruction_memory(mp->text, mp->text_size);
1221         }
1222 
1223         for (lp = linkmap; lp; lp = lp->modl_next) {
1224                 mp = mod(lp);
1225 
1226                 /*
1227                  * We need to re-read the full symbol table for the boot file,
1228                  * since we couldn't use the full one before.  We also need to
1229                  * load the CTF sections of both the boot file and the
1230                  * interpreter (us).
1231                  */
1232                 if (mp->flags & KOBJ_EXEC) {
1233                         struct _buf *file;
1234                         int n;
1235 
1236                         file = kobj_open_file(mp->filename);
1237                         if (file == (struct _buf *)-1)
1238                                 return (-1);
1239                         if (kobj_read_file(file, (char *)&mp->hdr,
1240                             sizeof (mp->hdr), 0) < 0)
1241                                 return (-1);
1242                         n = mp->hdr.e_shentsize * mp->hdr.e_shnum;
1243                         mp->shdrs = kobj_alloc(n, KM_WAIT);
1244                         if (kobj_read_file(file, mp->shdrs, n,
1245                             mp->hdr.e_shoff) < 0)
1246                                 return (-1);
1247                         if (get_syms(mp, file) < 0)
1248                                 return (-1);
1249                         if (get_ctf(mp, file) < 0)
1250                                 return (-1);
1251                         kobj_close_file(file);
1252                         mp->flags |= KOBJ_RELOCATED;
1253 
1254                 } else if (mp->flags & KOBJ_INTERP) {
1255                         struct _buf *file;
1256 
1257                         /*
1258                          * The interpreter path fragment in mp->filename
1259                          * will already have the module directory suffix
1260                          * in it (if appropriate).
1261                          */
1262                         file = kobj_open_path(mp->filename, 1, 0);
1263                         if (file == (struct _buf *)-1)
1264                                 return (-1);
1265                         if (get_ctf(mp, file) < 0)
1266                                 return (-1);
1267                         kobj_close_file(file);
1268                         mp->flags |= KOBJ_RELOCATED;
1269                 }
1270         }
1271 
1272         return (0);
1273 }
1274 
1275 static struct modctl *
1276 mod_already_loaded(char *modname)
1277 {
1278         struct modctl *mctl = kobj_modules;
1279 
1280         do {
1281                 if (strcmp(modname, mctl->mod_filename) == 0)
1282                         return (mctl);
1283                 mctl = mctl->mod_next;
1284 
1285         } while (mctl != kobj_modules);
1286 
1287         return (NULL);
1288 }
1289 
1290 /*
1291  * Load all the primary dependent modules.
1292  */
1293 static int
1294 load_primary(struct module *mp, int lmid)
1295 {
1296         struct modctl *cp;
1297         struct module *dmp;
1298         char *p, *q;
1299         char modname[MODMAXNAMELEN];
1300 
1301         if ((p = mp->depends_on) == NULL)
1302                 return (0);
1303 
1304         /* CONSTANTCONDITION */
1305         while (1) {
1306                 /*
1307                  * Skip space.
1308                  */
1309                 while (*p && (*p == ' ' || *p == '\t'))
1310                         p++;
1311                 /*
1312                  * Get module name.
1313                  */
1314                 q = modname;
1315                 while (*p && *p != ' ' && *p != '\t')
1316                         *q++ = *p++;
1317 
1318                 if (q == modname)
1319                         break;
1320 
1321                 *q = '\0';
1322                 /*
1323                  * Check for dup dependencies.
1324                  */
1325                 if (strcmp(modname, "dtracestubs") == 0 ||
1326                     mod_already_loaded(modname) != NULL)
1327                         continue;
1328 
1329                 cp = add_primary(modname, lmid);
1330                 cp->mod_busy = 1;
1331                 /*
1332                  * Load it.
1333                  */
1334                 (void) kobj_load_module(cp, 1);
1335                 cp->mod_busy = 0;
1336 
1337                 if ((dmp = cp->mod_mp) == NULL) {
1338                         cp->mod_loaded = 0;
1339                         cp->mod_installed = 0;
1340                         cp->mod_loadcnt = 0;
1341                         return (-1);
1342                 }
1343 
1344                 add_dependent(mp, dmp);
1345                 dmp->flags |= KOBJ_PRIM;
1346 
1347                 /*
1348                  * Recurse.
1349                  */
1350                 if (load_primary(dmp, lmid) == -1) {
1351                         cp->mod_loaded = 0;
1352                         cp->mod_installed = 0;
1353                         cp->mod_loadcnt = 0;
1354                         return (-1);
1355                 }
1356         }
1357         return (0);
1358 }
1359 
1360 static int
1361 console_is_usb_serial(void)
1362 {
1363         char *console;
1364         int len, ret;
1365 
1366         if ((len = BOP_GETPROPLEN(ops, "console")) == -1)
1367                 return (0);
1368 
1369         console = kobj_zalloc(len, KM_WAIT|KM_TMP);
1370         (void) BOP_GETPROP(ops, "console", console);
1371         ret = (strcmp(console, "usb-serial") == 0);
1372         kobj_free(console, len);
1373 
1374         return (ret);
1375 }
1376 
1377 static int
1378 load_kmdb(val_t *bootaux)
1379 {
1380         struct modctl *mctl;
1381         struct module *mp;
1382         Sym *sym;
1383 
1384         if (console_is_usb_serial()) {
1385                 _kobj_printf(ops, "kmdb not loaded "
1386                     "(unsupported on usb serial console)\n");
1387                 return (0);
1388         }
1389 
1390         _kobj_printf(ops, "Loading kmdb...\n");
1391 
1392         if ((mctl = add_primary("misc/kmdbmod", KOBJ_LM_DEBUGGER)) == NULL)
1393                 return (-1);
1394 
1395         mctl->mod_busy = 1;
1396         (void) kobj_load_module(mctl, 1);
1397         mctl->mod_busy = 0;
1398 
1399         if ((mp = mctl->mod_mp) == NULL)
1400                 return (-1);
1401 
1402         mp->flags |= KOBJ_PRIM;
1403 
1404         if (load_primary(mp, KOBJ_LM_DEBUGGER) < 0)
1405                 return (-1);
1406 
1407         if (boothowto & RB_VERBOSE)
1408                 kobj_lm_dump(KOBJ_LM_DEBUGGER);
1409 
1410         if (bind_primary(bootaux, KOBJ_LM_DEBUGGER) < 0)
1411                 return (-1);
1412 
1413         if ((sym = lookup_one(mctl->mod_mp, "kctl_boot_activate")) == NULL)
1414                 return (-1);
1415 
1416 #ifdef  KOBJ_DEBUG
1417         if (kobj_debug & D_DEBUG) {
1418                 _kobj_printf(ops, "calling kctl_boot_activate() @ 0x%lx\n",
1419                     sym->st_value);
1420                 _kobj_printf(ops, "\tops 0x%p\n", ops);
1421                 _kobj_printf(ops, "\tromp 0x%p\n", romp);
1422         }
1423 #endif
1424 
1425         if (((kctl_boot_activate_f *)sym->st_value)(ops, romp, 0,
1426             (const char **)kobj_kmdb_argv) < 0)
1427                 return (-1);
1428 
1429         return (0);
1430 }
1431 
1432 /*
1433  * Return a string listing module dependencies.
1434  */
1435 static char *
1436 depends_on(struct module *mp)
1437 {
1438         Sym *sp;
1439         char *depstr, *q;
1440 
1441         /*
1442          * The module doesn't have a depends_on value, so let's try it the
1443          * old-fashioned way - via "_depends_on"
1444          */
1445         if ((sp = lookup_one(mp, "_depends_on")) == NULL)
1446                 return (NULL);
1447 
1448         q = (char *)sp->st_value;
1449 
1450 #ifdef KOBJ_DEBUG
1451         /*
1452          * _depends_on is a deprecated interface, so we warn about its use
1453          * irrespective of subsequent processing errors. How else are we going
1454          * to be able to deco this interface completely?
1455          * Changes initially limited to DEBUG because third-party modules
1456          * should be flagged to developers before general use base.
1457          */
1458         _kobj_printf(ops,
1459             "Warning: %s uses deprecated _depends_on interface.\n",
1460             mp->filename);
1461         _kobj_printf(ops, "Please notify module developer or vendor.\n");
1462 #endif
1463 
1464         /*
1465          * Idiot checks. Make sure it's
1466          * in-bounds and NULL terminated.
1467          */
1468         if (kobj_addrcheck(mp, q) || q[sp->st_size - 1] != '\0') {
1469                 _kobj_printf(ops, "Error processing dependency for %s\n",
1470                     mp->filename);
1471                 return (NULL);
1472         }
1473 
1474         depstr = (char *)kobj_alloc(strlen(q) + 1, KM_WAIT);
1475         (void) strcpy(depstr, q);
1476 
1477         return (depstr);
1478 }
1479 
1480 void
1481 kobj_getmodinfo(void *xmp, struct modinfo *modinfo)
1482 {
1483         struct module *mp;
1484         mp = (struct module *)xmp;
1485 
1486         modinfo->mi_base = mp->text;
1487         modinfo->mi_size = mp->text_size + mp->data_size;
1488 }
1489 
1490 /*
1491  * kobj_export_ksyms() performs the following services:
1492  *
1493  * (1) Migrates the symbol table from boot/kobj memory to the ksyms arena.
1494  * (2) Removes unneeded symbols to save space.
1495  * (3) Reduces memory footprint by using VM_BESTFIT allocations.
1496  * (4) Makes the symbol table visible to /dev/ksyms.
1497  */
1498 static void
1499 kobj_export_ksyms(struct module *mp)
1500 {
1501         Sym *esp = (Sym *)(mp->symtbl + mp->symhdr->sh_size);
1502         Sym *sp, *osp;
1503         char *name;
1504         size_t namelen;
1505         struct module *omp;
1506         uint_t nsyms;
1507         size_t symsize = mp->symhdr->sh_entsize;
1508         size_t locals = 1;
1509         size_t strsize;
1510 
1511         /*
1512          * Make a copy of the original module structure.
1513          */
1514         omp = kobj_alloc(sizeof (struct module), KM_WAIT);
1515         bcopy(mp, omp, sizeof (struct module));
1516 
1517         /*
1518          * Compute the sizes of the new symbol table sections.
1519          */
1520         for (nsyms = strsize = 1, osp = (Sym *)omp->symtbl; osp < esp; osp++) {
1521                 if (osp->st_value == 0)
1522                         continue;
1523                 if (sym_lookup(omp, osp) == NULL)
1524                         continue;
1525                 name = omp->strings + osp->st_name;
1526                 namelen = strlen(name);
1527                 if (ELF_ST_BIND(osp->st_info) == STB_LOCAL)
1528                         locals++;
1529                 nsyms++;
1530                 strsize += namelen + 1;
1531         }
1532 
1533         mp->nsyms = nsyms;
1534         mp->hashsize = kobj_gethashsize(mp->nsyms);
1535 
1536         /*
1537          * ksyms_lock must be held as writer during any operation that
1538          * modifies ksyms_arena, including allocation from same, and
1539          * must not be dropped until the arena is vmem_walk()able.
1540          */
1541         rw_enter(&ksyms_lock, RW_WRITER);
1542 
1543         /*
1544          * Allocate space for the new section headers (symtab and strtab),
1545          * symbol table, buckets, chains, and strings.
1546          */
1547         mp->symsize = (2 * sizeof (Shdr)) + (nsyms * symsize) +
1548             (mp->hashsize + mp->nsyms) * sizeof (symid_t) + strsize;
1549 
1550         if (mp->flags & KOBJ_NOKSYMS) {
1551                 mp->symspace = kobj_alloc(mp->symsize, KM_WAIT);
1552         } else {
1553                 mp->symspace = vmem_alloc(ksyms_arena, mp->symsize,
1554                     VM_BESTFIT | VM_SLEEP);
1555         }
1556         bzero(mp->symspace, mp->symsize);
1557 
1558         /*
1559          * Divvy up symspace.
1560          */
1561         mp->shdrs = mp->symspace;
1562         mp->symhdr = (Shdr *)mp->shdrs;
1563         mp->strhdr = (Shdr *)(mp->symhdr + 1);
1564         mp->symtbl = (char *)(mp->strhdr + 1);
1565         mp->buckets = (symid_t *)(mp->symtbl + (nsyms * symsize));
1566         mp->chains = (symid_t *)(mp->buckets + mp->hashsize);
1567         mp->strings = (char *)(mp->chains + nsyms);
1568 
1569         /*
1570          * Fill in the new section headers (symtab and strtab).
1571          */
1572         mp->hdr.e_shnum = 2;
1573         mp->symtbl_section = 0;
1574 
1575         mp->symhdr->sh_type = SHT_SYMTAB;
1576         mp->symhdr->sh_addr = (Addr)mp->symtbl;
1577         mp->symhdr->sh_size = nsyms * symsize;
1578         mp->symhdr->sh_link = 1;
1579         mp->symhdr->sh_info = locals;
1580         mp->symhdr->sh_addralign = sizeof (Addr);
1581         mp->symhdr->sh_entsize = symsize;
1582 
1583         mp->strhdr->sh_type = SHT_STRTAB;
1584         mp->strhdr->sh_addr = (Addr)mp->strings;
1585         mp->strhdr->sh_size = strsize;
1586         mp->strhdr->sh_addralign = 1;
1587 
1588         /*
1589          * Construct the new symbol table.
1590          */
1591         for (nsyms = strsize = 1, osp = (Sym *)omp->symtbl; osp < esp; osp++) {
1592                 if (osp->st_value == 0)
1593                         continue;
1594                 if (sym_lookup(omp, osp) == NULL)
1595                         continue;
1596                 name = omp->strings + osp->st_name;
1597                 namelen = strlen(name);
1598                 sp = (Sym *)(mp->symtbl + symsize * nsyms);
1599                 bcopy(osp, sp, symsize);
1600                 bcopy(name, mp->strings + strsize, namelen);
1601                 sp->st_name = strsize;
1602                 sym_insert(mp, name, nsyms);
1603                 nsyms++;
1604                 strsize += namelen + 1;
1605         }
1606 
1607         rw_exit(&ksyms_lock);
1608 
1609         /*
1610          * Free the old section headers -- we'll never need them again.
1611          */
1612         if (!(mp->flags & KOBJ_PRIM)) {
1613                 uint_t  shn;
1614                 Shdr    *shp;
1615 
1616                 for (shn = 1; shn < omp->hdr.e_shnum; shn++) {
1617                         shp = (Shdr *)(omp->shdrs + shn * omp->hdr.e_shentsize);
1618                         switch (shp->sh_type) {
1619                         case SHT_RELA:
1620                         case SHT_REL:
1621                                 if (shp->sh_addr != 0) {
1622                                         kobj_free((void *)shp->sh_addr,
1623                                             shp->sh_size);
1624                                 }
1625                                 break;
1626                         }
1627                 }
1628                 kobj_free(omp->shdrs, omp->hdr.e_shentsize * omp->hdr.e_shnum);
1629         }
1630         /*
1631          * Discard the old symbol table and our copy of the module strucure.
1632          */
1633         if (!(mp->flags & KOBJ_PRIM))
1634                 kobj_free(omp->symspace, omp->symsize);
1635         kobj_free(omp, sizeof (struct module));
1636 }
1637 
1638 static void
1639 kobj_export_ctf(struct module *mp)
1640 {
1641         char *data = mp->ctfdata;
1642         size_t size = mp->ctfsize;
1643 
1644         if (data != NULL) {
1645                 if (_moddebug & MODDEBUG_NOCTF) {
1646                         mp->ctfdata = NULL;
1647                         mp->ctfsize = 0;
1648                 } else {
1649                         mp->ctfdata = vmem_alloc(ctf_arena, size,
1650                             VM_BESTFIT | VM_SLEEP);
1651                         bcopy(data, mp->ctfdata, size);
1652                 }
1653 
1654                 if (!(mp->flags & KOBJ_PRIM))
1655                         kobj_free(data, size);
1656         }
1657 }
1658 
1659 void
1660 kobj_export_module(struct module *mp)
1661 {
1662         kobj_export_ksyms(mp);
1663         kobj_export_ctf(mp);
1664 
1665         mp->flags |= KOBJ_EXPORTED;
1666 }
1667 
1668 static int
1669 process_dynamic(struct module *mp, char *dyndata, char *strdata)
1670 {
1671         char *path = NULL, *depstr = NULL;
1672         int allocsize = 0, osize = 0, nsize = 0;
1673         char *libname, *tmp;
1674         int lsize;
1675         Dyn *dynp;
1676 
1677         for (dynp = (Dyn *)dyndata; dynp && dynp->d_tag != DT_NULL; dynp++) {
1678                 switch (dynp->d_tag) {
1679                 case DT_NEEDED:
1680                         /*
1681                          * Read the DT_NEEDED entries, expanding the macros they
1682                          * contain (if any), and concatenating them into a
1683                          * single space-separated dependency list.
1684                          */
1685                         libname = (ulong_t)dynp->d_un.d_ptr + strdata;
1686 
1687                         if (strchr(libname, '$') != NULL) {
1688                                 char *_lib;
1689 
1690                                 if (path == NULL)
1691                                         path = kobj_alloc(MAXPATHLEN, KM_WAIT);
1692                                 if ((_lib = expand_libmacro(libname, path,
1693                                     path)) != NULL)
1694                                         libname = _lib;
1695                                 else {
1696                                         _kobj_printf(ops, "krtld: "
1697                                             "process_dynamic: failed to expand "
1698                                             "%s\n", libname);
1699                                 }
1700                         }
1701 
1702                         lsize = strlen(libname);
1703                         nsize += lsize;
1704                         if (nsize + 1 > allocsize) {
1705                                 tmp = kobj_alloc(allocsize + MAXPATHLEN,
1706                                     KM_WAIT);
1707                                 if (depstr != NULL) {
1708                                         bcopy(depstr, tmp, osize);
1709                                         kobj_free(depstr, allocsize);
1710                                 }
1711                                 depstr = tmp;
1712                                 allocsize += MAXPATHLEN;
1713                         }
1714                         bcopy(libname, depstr + osize, lsize);
1715                         *(depstr + nsize) = ' '; /* separator */
1716                         nsize++;
1717                         osize = nsize;
1718                         break;
1719 
1720                 case DT_FLAGS_1:
1721                         if (dynp->d_un.d_val & DF_1_IGNMULDEF)
1722                                 mp->flags |= KOBJ_IGNMULDEF;
1723                         if (dynp->d_un.d_val & DF_1_NOKSYMS)
1724                                 mp->flags |= KOBJ_NOKSYMS;
1725 
1726                         break;
1727                 }
1728         }
1729 
1730         /*
1731          * finish up the depends string (if any)
1732          */
1733         if (depstr != NULL) {
1734                 *(depstr + nsize - 1) = '\0'; /* overwrite separator w/term */
1735                 if (path != NULL)
1736                         kobj_free(path, MAXPATHLEN);
1737 
1738                 tmp = kobj_alloc(nsize, KM_WAIT);
1739                 bcopy(depstr, tmp, nsize);
1740                 kobj_free(depstr, allocsize);
1741                 depstr = tmp;
1742 
1743                 mp->depends_on = depstr;
1744         }
1745 
1746         return (0);
1747 }
1748 
1749 static int
1750 do_dynamic(struct module *mp, struct _buf *file)
1751 {
1752         Shdr *dshp, *dstrp, *shp;
1753         char *dyndata, *dstrdata;
1754         int dshn, shn, rc;
1755 
1756         /* find and validate the dynamic section (if any) */
1757 
1758         for (dshp = NULL, shn = 1; shn < mp->hdr.e_shnum; shn++) {
1759                 shp = (Shdr *)(mp->shdrs + shn * mp->hdr.e_shentsize);
1760                 switch (shp->sh_type) {
1761                 case SHT_DYNAMIC:
1762                         if (dshp != NULL) {
1763                                 _kobj_printf(ops, "krtld: get_dynamic: %s, ",
1764                                     mp->filename);
1765                                 _kobj_printf(ops,
1766                                     "multiple dynamic sections\n");
1767                                 return (-1);
1768                         } else {
1769                                 dshp = shp;
1770                                 dshn = shn;
1771                         }
1772                         break;
1773                 }
1774         }
1775 
1776         if (dshp == NULL)
1777                 return (0);
1778 
1779         if (dshp->sh_link > mp->hdr.e_shnum) {
1780                 _kobj_printf(ops, "krtld: get_dynamic: %s, ", mp->filename);
1781                 _kobj_printf(ops, "no section for sh_link %d\n", dshp->sh_link);
1782                 return (-1);
1783         }
1784         dstrp = (Shdr *)(mp->shdrs + dshp->sh_link * mp->hdr.e_shentsize);
1785 
1786         if (dstrp->sh_type != SHT_STRTAB) {
1787                 _kobj_printf(ops, "krtld: get_dynamic: %s, ", mp->filename);
1788                 _kobj_printf(ops, "sh_link not a string table for section %d\n",
1789                     dshn);
1790                 return (-1);
1791         }
1792 
1793         /* read it from disk */
1794 
1795         dyndata = kobj_alloc(dshp->sh_size, KM_WAIT|KM_TMP);
1796         if (kobj_read_file(file, dyndata, dshp->sh_size, dshp->sh_offset) < 0) {
1797                 _kobj_printf(ops, "krtld: get_dynamic: %s, ", mp->filename);
1798                 _kobj_printf(ops, "error reading section %d\n", dshn);
1799 
1800                 kobj_free(dyndata, dshp->sh_size);
1801                 return (-1);
1802         }
1803 
1804         dstrdata = kobj_alloc(dstrp->sh_size, KM_WAIT|KM_TMP);
1805         if (kobj_read_file(file, dstrdata, dstrp->sh_size,
1806             dstrp->sh_offset) < 0) {
1807                 _kobj_printf(ops, "krtld: get_dynamic: %s, ", mp->filename);
1808                 _kobj_printf(ops, "error reading section %d\n", dshp->sh_link);
1809 
1810                 kobj_free(dyndata, dshp->sh_size);
1811                 kobj_free(dstrdata, dstrp->sh_size);
1812                 return (-1);
1813         }
1814 
1815         /* pull the interesting pieces out */
1816 
1817         rc = process_dynamic(mp, dyndata, dstrdata);
1818 
1819         kobj_free(dyndata, dshp->sh_size);
1820         kobj_free(dstrdata, dstrp->sh_size);
1821 
1822         return (rc);
1823 }
1824 
1825 void
1826 kobj_set_ctf(struct module *mp, caddr_t data, size_t size)
1827 {
1828         if (!standalone) {
1829                 if (mp->ctfdata != NULL) {
1830                         if (vmem_contains(ctf_arena, mp->ctfdata,
1831                             mp->ctfsize)) {
1832                                 vmem_free(ctf_arena, mp->ctfdata, mp->ctfsize);
1833                         } else {
1834                                 kobj_free(mp->ctfdata, mp->ctfsize);
1835                         }
1836                 }
1837         }
1838 
1839         /*
1840          * The order is very important here.  We need to make sure that
1841          * consumers, at any given instant, see a consistent state.  We'd
1842          * rather they see no CTF data than the address of one buffer and the
1843          * size of another.
1844          */
1845         mp->ctfdata = NULL;
1846         membar_producer();
1847         mp->ctfsize = size;
1848         mp->ctfdata = data;
1849         membar_producer();
1850 }
1851 
1852 int
1853 kobj_load_module(struct modctl *modp, int use_path)
1854 {
1855         char *filename = modp->mod_filename;
1856         char *modname = modp->mod_modname;
1857         int i;
1858         int n;
1859         struct _buf *file;
1860         struct module *mp = NULL;
1861 #ifdef MODDIR_SUFFIX
1862         int no_suffixdir_drv = 0;
1863 #endif
1864 
1865         mp = kobj_zalloc(sizeof (struct module), KM_WAIT);
1866 
1867         /*
1868          * We need to prevent kmdb's symbols from leaking into /dev/ksyms.
1869          * kmdb contains a bunch of symbols with well-known names, symbols
1870          * which will mask the real versions, thus causing no end of trouble
1871          * for mdb.
1872          */
1873         if (strcmp(modp->mod_modname, "kmdbmod") == 0)
1874                 mp->flags |= KOBJ_NOKSYMS;
1875 
1876         file = kobj_open_path(filename, use_path, 1);
1877         if (file == (struct _buf *)-1) {
1878 #ifdef MODDIR_SUFFIX
1879                 file = kobj_open_path(filename, use_path, 0);
1880 #endif
1881                 if (file == (struct _buf *)-1) {
1882                         kobj_free(mp, sizeof (*mp));
1883                         goto bad;
1884                 }
1885 #ifdef MODDIR_SUFFIX
1886                 /*
1887                  * There is no driver module in the ISA specific (suffix)
1888                  * subdirectory but there is a module in the parent directory.
1889                  */
1890                 if (strncmp(filename, "drv/", 4) == 0) {
1891                         no_suffixdir_drv = 1;
1892                 }
1893 #endif
1894         }
1895 
1896         mp->filename = kobj_alloc(strlen(file->_name) + 1, KM_WAIT);
1897         (void) strcpy(mp->filename, file->_name);
1898 
1899         if (kobj_read_file(file, (char *)&mp->hdr, sizeof (mp->hdr), 0) < 0) {
1900                 _kobj_printf(ops, "kobj_load_module: %s read header failed\n",
1901                     modname);
1902                 kobj_free(mp->filename, strlen(file->_name) + 1);
1903                 kobj_free(mp, sizeof (*mp));
1904                 goto bad;
1905         }
1906         for (i = 0; i < SELFMAG; i++) {
1907                 if (mp->hdr.e_ident[i] != ELFMAG[i]) {
1908                         if (_moddebug & MODDEBUG_ERRMSG)
1909                                 _kobj_printf(ops, "%s not an elf module\n",
1910                                     modname);
1911                         kobj_free(mp->filename, strlen(file->_name) + 1);
1912                         kobj_free(mp, sizeof (*mp));
1913                         goto bad;
1914                 }
1915         }
1916         /*
1917          * It's ELF, but is it our ISA?  Interpreting the header
1918          * from a file for a byte-swapped ISA could cause a huge
1919          * and unsatisfiable value to be passed to kobj_alloc below
1920          * and therefore hang booting.
1921          */
1922         if (!elf_mach_ok(&mp->hdr)) {
1923                 if (_moddebug & MODDEBUG_ERRMSG)
1924                         _kobj_printf(ops, "%s not an elf module for this ISA\n",
1925                             modname);
1926                 kobj_free(mp->filename, strlen(file->_name) + 1);
1927                 kobj_free(mp, sizeof (*mp));
1928 #ifdef MODDIR_SUFFIX
1929                 /*
1930                  * The driver mod is not in the ISA specific subdirectory
1931                  * and the module in the parent directory is not our ISA.
1932                  * If it is our ISA, for now we will silently succeed.
1933                  */
1934                 if (no_suffixdir_drv == 1) {
1935                         cmn_err(CE_CONT, "?NOTICE: %s: 64-bit driver module"
1936                             " not found\n", modname);
1937                 }
1938 #endif
1939                 goto bad;
1940         }
1941 
1942         /*
1943          * All modules, save for unix, should be relocatable (as opposed to
1944          * dynamic).  Dynamic modules come with PLTs and GOTs, which can't
1945          * currently be processed by krtld.
1946          */
1947         if (mp->hdr.e_type != ET_REL) {
1948                 if (_moddebug & MODDEBUG_ERRMSG)
1949                         _kobj_printf(ops, "%s isn't a relocatable (ET_REL) "
1950                             "module\n", modname);
1951                 kobj_free(mp->filename, strlen(file->_name) + 1);
1952                 kobj_free(mp, sizeof (*mp));
1953                 goto bad;
1954         }
1955 
1956         n = mp->hdr.e_shentsize * mp->hdr.e_shnum;
1957         mp->shdrs = kobj_alloc(n, KM_WAIT);
1958 
1959         if (kobj_read_file(file, mp->shdrs, n, mp->hdr.e_shoff) < 0) {
1960                 _kobj_printf(ops, "kobj_load_module: %s error reading "
1961                     "section headers\n", modname);
1962                 kobj_free(mp->shdrs, n);
1963                 kobj_free(mp->filename, strlen(file->_name) + 1);
1964                 kobj_free(mp, sizeof (*mp));
1965                 goto bad;
1966         }
1967 
1968         kobj_notify(KOBJ_NOTIFY_MODLOADING, modp);
1969         module_assign(modp, mp);
1970 
1971         /* read in sections */
1972         if (get_progbits(mp, file) < 0) {
1973                 _kobj_printf(ops, "%s error reading sections\n", modname);
1974                 goto bad;
1975         }
1976 
1977         if (do_dynamic(mp, file) < 0) {
1978                 _kobj_printf(ops, "%s error reading dynamic section\n",
1979                     modname);
1980                 goto bad;
1981         }
1982 
1983         modp->mod_text = mp->text;
1984         modp->mod_text_size = mp->text_size;
1985 
1986         /* read in symbols; adjust values for each section's real address */
1987         if (get_syms(mp, file) < 0) {
1988                 _kobj_printf(ops, "%s error reading symbols\n",
1989                     modname);
1990                 goto bad;
1991         }
1992 
1993         /*
1994          * If we didn't dependency information from the dynamic section, look
1995          * for it the old-fashioned way.
1996          */
1997         if (mp->depends_on == NULL)
1998                 mp->depends_on = depends_on(mp);
1999 
2000         if (get_ctf(mp, file) < 0) {
2001                 _kobj_printf(ops, "%s debug information will not "
2002                     "be available\n", modname);
2003         }
2004 
2005         /* primary kernel modules do not have a signature section */
2006         if (!(mp->flags & KOBJ_PRIM))
2007                 get_signature(mp, file);
2008 
2009 #ifdef  KOBJ_DEBUG
2010         if (kobj_debug & D_LOADING) {
2011                 _kobj_printf(ops, "krtld: file=%s\n", mp->filename);
2012                 _kobj_printf(ops, "\ttext:0x%p", mp->text);
2013                 _kobj_printf(ops, " size: 0x%lx\n", mp->text_size);
2014                 _kobj_printf(ops, "\tdata:0x%p", mp->data);
2015                 _kobj_printf(ops, " dsize: 0x%lx\n", mp->data_size);
2016         }
2017 #endif /* KOBJ_DEBUG */
2018 
2019         /*
2020          * For primary kernel modules, we defer
2021          * symbol resolution and relocation until
2022          * all primary objects have been loaded.
2023          */
2024         if (!standalone) {
2025                 int ddrval, dcrval;
2026                 char *dependent_modname;
2027                 /* load all dependents */
2028                 dependent_modname = kobj_zalloc(MODMAXNAMELEN, KM_WAIT);
2029                 ddrval = do_dependents(modp, dependent_modname, MODMAXNAMELEN);
2030 
2031                 /*
2032                  * resolve undefined and common symbols,
2033                  * also allocates common space
2034                  */
2035                 if ((dcrval = do_common(mp)) < 0) {
2036                         switch (dcrval) {
2037                         case DOSYM_UNSAFE:
2038                                 _kobj_printf(ops, "WARNING: mod_load: "
2039                                     "MT-unsafe module '%s' rejected\n",
2040                                     modname);
2041                                 break;
2042                         case DOSYM_UNDEF:
2043                                 _kobj_printf(ops, "WARNING: mod_load: "
2044                                     "cannot load module '%s'\n",
2045                                     modname);
2046                                 if (ddrval == -1) {
2047                                         _kobj_printf(ops, "WARNING: %s: ",
2048                                             modname);
2049                                         _kobj_printf(ops,
2050                                             "unable to resolve dependency, "
2051                                             "module '%s' not found\n",
2052                                             dependent_modname);
2053                                 }
2054                                 break;
2055                         }
2056                 }
2057                 kobj_free(dependent_modname, MODMAXNAMELEN);
2058                 if (dcrval < 0)
2059                         goto bad;
2060 
2061                 /* process relocation tables */
2062                 if (do_relocations(mp) < 0) {
2063                         _kobj_printf(ops, "%s error doing relocations\n",
2064                             modname);
2065                         goto bad;
2066                 }
2067 
2068                 if (mp->destination) {
2069                         off_t   off = (uintptr_t)mp->destination & PAGEOFFSET;
2070                         caddr_t base = (caddr_t)mp->destination - off;
2071                         size_t  size = P2ROUNDUP(mp->text_size + off, PAGESIZE);
2072 
2073                         hat_unload(kas.a_hat, base, size, HAT_UNLOAD_UNLOCK);
2074                         vmem_free(heap_arena, base, size);
2075                 }
2076 
2077                 /* sync_instruction_memory */
2078                 kobj_sync_instruction_memory(mp->text, mp->text_size);
2079                 kobj_export_module(mp);
2080                 kobj_notify(KOBJ_NOTIFY_MODLOADED, modp);
2081         }
2082         kobj_close_file(file);
2083         return (0);
2084 bad:
2085         if (file != (struct _buf *)-1)
2086                 kobj_close_file(file);
2087         if (modp->mod_mp != NULL)
2088                 free_module_data(modp->mod_mp);
2089 
2090         module_assign(modp, NULL);
2091         return ((file == (struct _buf *)-1) ? ENOENT : EINVAL);
2092 }
2093 
2094 int
2095 kobj_load_primary_module(struct modctl *modp)
2096 {
2097         struct modctl *dep;
2098         struct module *mp;
2099 
2100         if (kobj_load_module(modp, 0) != 0)
2101                 return (-1);
2102 
2103         dep = NULL;
2104         mp = modp->mod_mp;
2105         mp->flags |= KOBJ_PRIM;
2106 
2107         /* Bind new module to its dependents */
2108         if (mp->depends_on != NULL && (dep =
2109             mod_already_loaded(mp->depends_on)) == NULL) {
2110 #ifdef  KOBJ_DEBUG
2111                 if (kobj_debug & D_DEBUG) {
2112                         _kobj_printf(ops, "krtld: failed to resolve deps "
2113                             "for primary %s\n", modp->mod_modname);
2114                 }
2115 #endif
2116                 return (-1);
2117         }
2118 
2119         if (dep != NULL)
2120                 add_dependent(mp, dep->mod_mp);
2121 
2122         /*
2123          * Relocate it.  This module may not be part of a link map, so we
2124          * can't use bind_primary.
2125          */
2126         if (do_common(mp) < 0 || do_symbols(mp, 0) < 0 ||
2127             do_relocations(mp) < 0) {
2128 #ifdef  KOBJ_DEBUG
2129                 if (kobj_debug & D_DEBUG) {
2130                         _kobj_printf(ops, "krtld: failed to relocate "
2131                             "primary %s\n", modp->mod_modname);
2132                 }
2133 #endif
2134                 return (-1);
2135         }
2136 
2137         return (0);
2138 }
2139 
2140 static void
2141 module_assign(struct modctl *cp, struct module *mp)
2142 {
2143         if (standalone) {
2144                 cp->mod_mp = mp;
2145                 return;
2146         }
2147         mutex_enter(&mod_lock);
2148         cp->mod_mp = mp;
2149         cp->mod_gencount++;
2150         mutex_exit(&mod_lock);
2151 }
2152 
2153 void
2154 kobj_unload_module(struct modctl *modp)
2155 {
2156         struct module *mp = modp->mod_mp;
2157 
2158         if ((_moddebug & MODDEBUG_KEEPTEXT) && mp) {
2159                 _kobj_printf(ops, "text for %s ", mp->filename);
2160                 _kobj_printf(ops, "was at %p\n", mp->text);
2161                 mp->text = NULL;     /* don't actually free it */
2162         }
2163 
2164         kobj_notify(KOBJ_NOTIFY_MODUNLOADING, modp);
2165 
2166         /*
2167          * Null out mod_mp first, so consumers (debuggers) know not to look
2168          * at the module structure any more.
2169          */
2170         mutex_enter(&mod_lock);
2171         modp->mod_mp = NULL;
2172         mutex_exit(&mod_lock);
2173 
2174         kobj_notify(KOBJ_NOTIFY_MODUNLOADED, modp);
2175         free_module_data(mp);
2176 }
2177 
2178 static void
2179 free_module_data(struct module *mp)
2180 {
2181         struct module_list *lp, *tmp;
2182         int ksyms_exported = 0;
2183 
2184         lp = mp->head;
2185         while (lp) {
2186                 tmp = lp;
2187                 lp = lp->next;
2188                 kobj_free((char *)tmp, sizeof (*tmp));
2189         }
2190 
2191         rw_enter(&ksyms_lock, RW_WRITER);
2192         if (mp->symspace) {
2193                 if (vmem_contains(ksyms_arena, mp->symspace, mp->symsize)) {
2194                         vmem_free(ksyms_arena, mp->symspace, mp->symsize);
2195                         ksyms_exported = 1;
2196                 } else {
2197                         if (mp->flags & KOBJ_NOKSYMS)
2198                                 ksyms_exported = 1;
2199                         kobj_free(mp->symspace, mp->symsize);
2200                 }
2201         }
2202         rw_exit(&ksyms_lock);
2203 
2204         if (mp->ctfdata) {
2205                 if (vmem_contains(ctf_arena, mp->ctfdata, mp->ctfsize))
2206                         vmem_free(ctf_arena, mp->ctfdata, mp->ctfsize);
2207                 else
2208                         kobj_free(mp->ctfdata, mp->ctfsize);
2209         }
2210 
2211         if (mp->sigdata)
2212                 kobj_free(mp->sigdata, mp->sigsize);
2213 
2214         /*
2215          * We did not get far enough into kobj_export_ksyms() to free allocated
2216          * buffers because we encounted error conditions. Free the buffers.
2217          */
2218         if ((ksyms_exported == 0) && (mp->shdrs != NULL)) {
2219                 uint_t shn;
2220                 Shdr *shp;
2221 
2222                 for (shn = 1; shn < mp->hdr.e_shnum; shn++) {
2223                         shp = (Shdr *)(mp->shdrs + shn * mp->hdr.e_shentsize);
2224                         switch (shp->sh_type) {
2225                         case SHT_RELA:
2226                         case SHT_REL:
2227                                 if (shp->sh_addr != 0)
2228                                         kobj_free((void *)shp->sh_addr,
2229                                             shp->sh_size);
2230                                 break;
2231                         }
2232                 }
2233 err_free_done:
2234                 if (!(mp->flags & KOBJ_PRIM)) {
2235                         kobj_free(mp->shdrs,
2236                             mp->hdr.e_shentsize * mp->hdr.e_shnum);
2237                 }
2238         }
2239 
2240         if (mp->bss)
2241                 vmem_free(data_arena, (void *)mp->bss, mp->bss_size);
2242 
2243         if (mp->fbt_tab)
2244                 kobj_texthole_free(mp->fbt_tab, mp->fbt_size);
2245 
2246         if (mp->textwin_base)
2247                 kobj_textwin_free(mp);
2248 
2249         if (mp->sdt_probes != NULL) {
2250                 sdt_probedesc_t *sdp = mp->sdt_probes, *next;
2251 
2252                 while (sdp != NULL) {
2253                         next = sdp->sdpd_next;
2254                         kobj_free(sdp->sdpd_name, strlen(sdp->sdpd_name) + 1);
2255                         kobj_free(sdp, sizeof (sdt_probedesc_t));
2256                         sdp = next;
2257                 }
2258         }
2259 
2260         if (mp->sdt_tab)
2261                 kobj_texthole_free(mp->sdt_tab, mp->sdt_size);
2262         if (mp->text)
2263                 vmem_free(text_arena, mp->text, mp->text_size);
2264         if (mp->data)
2265                 vmem_free(data_arena, mp->data, mp->data_size);
2266         if (mp->depends_on)
2267                 kobj_free(mp->depends_on, strlen(mp->depends_on)+1);
2268         if (mp->filename)
2269                 kobj_free(mp->filename, strlen(mp->filename)+1);
2270 
2271         kobj_free((char *)mp, sizeof (*mp));
2272 }
2273 
2274 static int
2275 get_progbits(struct module *mp, struct _buf *file)
2276 {
2277         struct proginfo *tp, *dp, *sdp;
2278         Shdr *shp;
2279         reloc_dest_t dest = NULL;
2280         uintptr_t bits_ptr;
2281         uintptr_t text = 0, data, textptr;
2282         uint_t shn;
2283         int err = -1;
2284 
2285         tp = kobj_zalloc(sizeof (struct proginfo), KM_WAIT|KM_TMP);
2286         dp = kobj_zalloc(sizeof (struct proginfo), KM_WAIT|KM_TMP);
2287         sdp = kobj_zalloc(sizeof (struct proginfo), KM_WAIT|KM_TMP);
2288         /*
2289          * loop through sections to find out how much space we need
2290          * for text, data, (also bss that is already assigned)
2291          */
2292         if (get_progbits_size(mp, tp, dp, sdp) < 0)
2293                 goto done;
2294 
2295         mp->text_size = tp->size;
2296         mp->data_size = dp->size;
2297 
2298         if (standalone) {
2299                 caddr_t limit = _data;
2300 
2301                 if (lg_pagesize && _text + lg_pagesize < limit)
2302                         limit = _text + lg_pagesize;
2303 
2304                 mp->text = kobj_segbrk(&_etext, mp->text_size,
2305                     tp->align, limit);
2306                 /*
2307                  * If we can't grow the text segment, try the
2308                  * data segment before failing.
2309                  */
2310                 if (mp->text == NULL) {
2311                         mp->text = kobj_segbrk(&_edata, mp->text_size,
2312                             tp->align, 0);
2313                 }
2314 
2315                 mp->data = kobj_segbrk(&_edata, mp->data_size, dp->align, 0);
2316 
2317                 if (mp->text == NULL || mp->data == NULL)
2318                         goto done;
2319 
2320         } else {
2321                 if (text_arena == NULL)
2322                         kobj_vmem_init(&text_arena, &data_arena);
2323 
2324                 /*
2325                  * some architectures may want to load the module on a
2326                  * page that is currently read only. It may not be
2327                  * possible for those architectures to remap their page
2328                  * on the fly. So we provide a facility for them to hang
2329                  * a private hook where the memory they assign the module
2330                  * is not the actual place where the module loads.
2331                  *
2332                  * In this case there are two addresses that deal with the
2333                  * modload.
2334                  * 1) the final destination of the module
2335                  * 2) the address that is used to view the newly
2336                  * loaded module until all the relocations relative to 1
2337                  * above are completed.
2338                  *
2339                  * That is what dest is used for below.
2340                  */
2341                 mp->text_size += tp->align;
2342                 mp->data_size += dp->align;
2343 
2344                 mp->text = kobj_text_alloc(text_arena, mp->text_size);
2345 
2346                 /*
2347                  * a remap is taking place. Align the text ptr relative
2348                  * to the secondary mapping. That is where the bits will
2349                  * be read in.
2350                  */
2351                 if (kvseg.s_base != NULL && !vmem_contains(heaptext_arena,
2352                     mp->text, mp->text_size)) {
2353                         off_t   off = (uintptr_t)mp->text & PAGEOFFSET;
2354                         size_t  size = P2ROUNDUP(mp->text_size + off, PAGESIZE);
2355                         caddr_t map = vmem_alloc(heap_arena, size, VM_SLEEP);
2356                         caddr_t orig = mp->text - off;
2357                         pgcnt_t pages = size / PAGESIZE;
2358 
2359                         dest = (reloc_dest_t)(map + off);
2360                         text = ALIGN((uintptr_t)dest, tp->align);
2361 
2362                         while (pages--) {
2363                                 hat_devload(kas.a_hat, map, PAGESIZE,
2364                                     hat_getpfnum(kas.a_hat, orig),
2365                                     PROT_READ | PROT_WRITE | PROT_EXEC,
2366                                     HAT_LOAD_NOCONSIST | HAT_LOAD_LOCK);
2367                                 map += PAGESIZE;
2368                                 orig += PAGESIZE;
2369                         }
2370                         /*
2371                          * Since we set up a non-cacheable mapping, we need
2372                          * to flush any old entries in the cache that might
2373                          * be left around from the read-only mapping.
2374                          */
2375                         dcache_flushall();
2376                 }
2377                 if (mp->data_size)
2378                         mp->data = vmem_alloc(data_arena, mp->data_size,
2379                             VM_SLEEP | VM_BESTFIT);
2380         }
2381         textptr = (uintptr_t)mp->text;
2382         textptr = ALIGN(textptr, tp->align);
2383         mp->destination = dest;
2384 
2385         /*
2386          * This is the case where a remap is not being done.
2387          */
2388         if (text == 0)
2389                 text = ALIGN((uintptr_t)mp->text, tp->align);
2390         data = ALIGN((uintptr_t)mp->data, dp->align);
2391 
2392         /* now loop though sections assigning addresses and loading the data */
2393         for (shn = 1; shn < mp->hdr.e_shnum; shn++) {
2394                 shp = (Shdr *)(mp->shdrs + shn * mp->hdr.e_shentsize);
2395                 if (!(shp->sh_flags & SHF_ALLOC))
2396                         continue;
2397 
2398                 if ((shp->sh_flags & SHF_WRITE) == 0)
2399                         bits_ptr = text;
2400                 else
2401                         bits_ptr = data;
2402 
2403                 bits_ptr = ALIGN(bits_ptr, shp->sh_addralign);
2404 
2405                 if (shp->sh_type == SHT_NOBITS) {
2406                         /*
2407                          * Zero bss.
2408                          */
2409                         bzero((caddr_t)bits_ptr, shp->sh_size);
2410                         shp->sh_type = SHT_PROGBITS;
2411                 } else {
2412                         if (kobj_read_file(file, (char *)bits_ptr,
2413                             shp->sh_size, shp->sh_offset) < 0)
2414                                 goto done;
2415                 }
2416 
2417                 if (shp->sh_flags & SHF_WRITE) {
2418                         shp->sh_addr = bits_ptr;
2419                 } else {
2420                         textptr = ALIGN(textptr, shp->sh_addralign);
2421                         shp->sh_addr = textptr;
2422                         textptr += shp->sh_size;
2423                 }
2424 
2425                 bits_ptr += shp->sh_size;
2426                 if ((shp->sh_flags & SHF_WRITE) == 0)
2427                         text = bits_ptr;
2428                 else
2429                         data = bits_ptr;
2430         }
2431 
2432         err = 0;
2433 done:
2434         /*
2435          * Free and mark as freed the section headers here so that
2436          * free_module_data() does not have to worry about this buffer.
2437          *
2438          * This buffer is freed here because one of the possible reasons
2439          * for error is a section with non-zero sh_addr and in that case
2440          * free_module_data() would have no way of recognizing that this
2441          * buffer was unallocated.
2442          */
2443         if (err != 0) {
2444                 kobj_free(mp->shdrs, mp->hdr.e_shentsize * mp->hdr.e_shnum);
2445                 mp->shdrs = NULL;
2446         }
2447 
2448         (void) kobj_free(tp, sizeof (struct proginfo));
2449         (void) kobj_free(dp, sizeof (struct proginfo));
2450         (void) kobj_free(sdp, sizeof (struct proginfo));
2451 
2452         return (err);
2453 }
2454 
2455 /*
2456  * Go through suppress_sym_list to see if "multiply defined"
2457  * warning of this symbol should be suppressed.  Return 1 if
2458  * warning should be suppressed, 0 otherwise.
2459  */
2460 static int
2461 kobj_suppress_warning(char *symname)
2462 {
2463         int     i;
2464 
2465         for (i = 0; suppress_sym_list[i] != NULL; i++) {
2466                 if (strcmp(suppress_sym_list[i], symname) == 0)
2467                         return (1);
2468         }
2469 
2470         return (0);
2471 }
2472 
2473 static int
2474 get_syms(struct module *mp, struct _buf *file)
2475 {
2476         uint_t          shn;
2477         Shdr    *shp;
2478         uint_t          i;
2479         Sym     *sp, *ksp;
2480         char            *symname;
2481         int             dosymtab = 0;
2482 
2483         /*
2484          * Find the interesting sections.
2485          */
2486         for (shn = 1; shn < mp->hdr.e_shnum; shn++) {
2487                 shp = (Shdr *)(mp->shdrs + shn * mp->hdr.e_shentsize);
2488                 switch (shp->sh_type) {
2489                 case SHT_SYMTAB:
2490                         mp->symtbl_section = shn;
2491                         mp->symhdr = shp;
2492                         dosymtab++;
2493                         break;
2494 
2495                 case SHT_RELA:
2496                 case SHT_REL:
2497                         /*
2498                          * Already loaded.
2499                          */
2500                         if (shp->sh_addr)
2501                                 continue;
2502 
2503                         /* KM_TMP since kobj_free'd in do_relocations */
2504                         shp->sh_addr = (Addr)
2505                             kobj_alloc(shp->sh_size, KM_WAIT|KM_TMP);
2506 
2507                         if (kobj_read_file(file, (char *)shp->sh_addr,
2508                             shp->sh_size, shp->sh_offset) < 0) {
2509                                 _kobj_printf(ops, "krtld: get_syms: %s, ",
2510                                     mp->filename);
2511                                 _kobj_printf(ops, "error reading section %d\n",
2512                                     shn);
2513                                 return (-1);
2514                         }
2515                         break;
2516                 }
2517         }
2518 
2519         /*
2520          * This is true for a stripped executable.  In the case of
2521          * 'unix' it can be stripped but it still contains the SHT_DYNSYM,
2522          * and since that symbol information is still present everything
2523          * is just fine.
2524          */
2525         if (!dosymtab) {
2526                 if (mp->flags & KOBJ_EXEC)
2527                         return (0);
2528                 _kobj_printf(ops, "krtld: get_syms: %s ",
2529                     mp->filename);
2530                 _kobj_printf(ops, "no SHT_SYMTAB symbol table found\n");
2531                 return (-1);
2532         }
2533 
2534         /*
2535          * get the associated string table header
2536          */
2537         if ((mp->symhdr == 0) || (mp->symhdr->sh_link >= mp->hdr.e_shnum))
2538                 return (-1);
2539         mp->strhdr = (Shdr *)
2540             (mp->shdrs + mp->symhdr->sh_link * mp->hdr.e_shentsize);
2541 
2542         mp->nsyms = mp->symhdr->sh_size / mp->symhdr->sh_entsize;
2543         mp->hashsize = kobj_gethashsize(mp->nsyms);
2544 
2545         /*
2546          * Allocate space for the symbol table, buckets, chains, and strings.
2547          */
2548         mp->symsize = mp->symhdr->sh_size +
2549             (mp->hashsize + mp->nsyms) * sizeof (symid_t) + mp->strhdr->sh_size;
2550         mp->symspace = kobj_zalloc(mp->symsize, KM_WAIT|KM_SCRATCH);
2551 
2552         mp->symtbl = mp->symspace;
2553         mp->buckets = (symid_t *)(mp->symtbl + mp->symhdr->sh_size);
2554         mp->chains = mp->buckets + mp->hashsize;
2555         mp->strings = (char *)(mp->chains + mp->nsyms);
2556 
2557         if (kobj_read_file(file, mp->symtbl,
2558             mp->symhdr->sh_size, mp->symhdr->sh_offset) < 0 ||
2559             kobj_read_file(file, mp->strings,
2560             mp->strhdr->sh_size, mp->strhdr->sh_offset) < 0)
2561                 return (-1);
2562 
2563         /*
2564          * loop through the symbol table adjusting values to account
2565          * for where each section got loaded into memory.  Also
2566          * fill in the hash table.
2567          */
2568         for (i = 1; i < mp->nsyms; i++) {
2569                 sp = (Sym *)(mp->symtbl + i * mp->symhdr->sh_entsize);
2570                 if (sp->st_shndx < SHN_LORESERVE) {
2571                         if (sp->st_shndx >= mp->hdr.e_shnum) {
2572                                 _kobj_printf(ops, "%s bad shndx ",
2573                                     file->_name);
2574                                 _kobj_printf(ops, "in symbol %d\n", i);
2575                                 return (-1);
2576                         }
2577                         shp = (Shdr *)
2578                             (mp->shdrs +
2579                             sp->st_shndx * mp->hdr.e_shentsize);
2580                         if (!(mp->flags & KOBJ_EXEC))
2581                                 sp->st_value += shp->sh_addr;
2582                 }
2583 
2584                 if (sp->st_name == 0 || sp->st_shndx == SHN_UNDEF)
2585                         continue;
2586                 if (sp->st_name >= mp->strhdr->sh_size)
2587                         return (-1);
2588 
2589                 symname = mp->strings + sp->st_name;
2590 
2591                 if (!(mp->flags & KOBJ_EXEC) &&
2592                     ELF_ST_BIND(sp->st_info) == STB_GLOBAL) {
2593                         ksp = kobj_lookup_all(mp, symname, 0);
2594 
2595                         if (ksp && ELF_ST_BIND(ksp->st_info) == STB_GLOBAL &&
2596                             !kobj_suppress_warning(symname) &&
2597                             sp->st_shndx != SHN_UNDEF &&
2598                             sp->st_shndx != SHN_COMMON &&
2599                             ksp->st_shndx != SHN_UNDEF &&
2600                             ksp->st_shndx != SHN_COMMON) {
2601                                 /*
2602                                  * Unless this symbol is a stub, it's multiply
2603                                  * defined.  Multiply-defined symbols are
2604                                  * usually bad, but some objects (kmdb) have
2605                                  * a legitimate need to have their own
2606                                  * copies of common functions.
2607                                  */
2608                                 if ((standalone ||
2609                                     ksp->st_value < (uintptr_t)stubs_base ||
2610                                     ksp->st_value >= (uintptr_t)stubs_end) &&
2611                                     !(mp->flags & KOBJ_IGNMULDEF)) {
2612                                         _kobj_printf(ops,
2613                                             "%s symbol ", file->_name);
2614                                         _kobj_printf(ops,
2615                                             "%s multiply defined\n", symname);
2616                                 }
2617                         }
2618                 }
2619 
2620                 sym_insert(mp, symname, i);
2621         }
2622 
2623         return (0);
2624 }
2625 
2626 static int
2627 get_ctf(struct module *mp, struct _buf *file)
2628 {
2629         char *shstrtab, *ctfdata;
2630         size_t shstrlen;
2631         Shdr *shp;
2632         uint_t i;
2633 
2634         if (_moddebug & MODDEBUG_NOCTF)
2635                 return (0); /* do not attempt to even load CTF data */
2636 
2637         if (mp->hdr.e_shstrndx >= mp->hdr.e_shnum) {
2638                 _kobj_printf(ops, "krtld: get_ctf: %s, ",
2639                     mp->filename);
2640                 _kobj_printf(ops, "corrupt e_shstrndx %u\n",
2641                     mp->hdr.e_shstrndx);
2642                 return (-1);
2643         }
2644 
2645         shp = (Shdr *)(mp->shdrs + mp->hdr.e_shstrndx * mp->hdr.e_shentsize);
2646         shstrlen = shp->sh_size;
2647         shstrtab = kobj_alloc(shstrlen, KM_WAIT|KM_TMP);
2648 
2649         if (kobj_read_file(file, shstrtab, shstrlen, shp->sh_offset) < 0) {
2650                 _kobj_printf(ops, "krtld: get_ctf: %s, ",
2651                     mp->filename);
2652                 _kobj_printf(ops, "error reading section %u\n",
2653                     mp->hdr.e_shstrndx);
2654                 kobj_free(shstrtab, shstrlen);
2655                 return (-1);
2656         }
2657 
2658         for (i = 0; i < mp->hdr.e_shnum; i++) {
2659                 shp = (Shdr *)(mp->shdrs + i * mp->hdr.e_shentsize);
2660 
2661                 if (shp->sh_size != 0 && shp->sh_name < shstrlen &&
2662                     strcmp(shstrtab + shp->sh_name, ".SUNW_ctf") == 0) {
2663                         ctfdata = kobj_alloc(shp->sh_size, KM_WAIT|KM_SCRATCH);
2664 
2665                         if (kobj_read_file(file, ctfdata, shp->sh_size,
2666                             shp->sh_offset) < 0) {
2667                                 _kobj_printf(ops, "krtld: get_ctf: %s, error "
2668                                     "reading .SUNW_ctf data\n", mp->filename);
2669                                 kobj_free(ctfdata, shp->sh_size);
2670                                 kobj_free(shstrtab, shstrlen);
2671                                 return (-1);
2672                         }
2673 
2674                         mp->ctfdata = ctfdata;
2675                         mp->ctfsize = shp->sh_size;
2676                         break;
2677                 }
2678         }
2679 
2680         kobj_free(shstrtab, shstrlen);
2681         return (0);
2682 }
2683 
2684 #define SHA1_DIGEST_LENGTH      20      /* SHA1 digest length in bytes */
2685 
2686 /*
2687  * Return the hash of the ELF sections that are memory resident.
2688  * i.e. text and data.  We skip a SHT_NOBITS section since it occupies
2689  * no space in the file. We use SHA1 here since libelfsign uses
2690  * it and both places need to use the same algorithm.
2691  */
2692 static void
2693 crypto_es_hash(struct module *mp, char *hash, char *shstrtab)
2694 {
2695         uint_t shn;
2696         Shdr *shp;
2697         SHA1_CTX ctx;
2698 
2699         SHA1Init(&ctx);
2700 
2701         for (shn = 1; shn < mp->hdr.e_shnum; shn++) {
2702                 shp = (Shdr *)(mp->shdrs + shn * mp->hdr.e_shentsize);
2703                 if (!(shp->sh_flags & SHF_ALLOC) || shp->sh_size == 0)
2704                         continue;
2705 
2706                 /*
2707                  * The check should ideally be shp->sh_type == SHT_NOBITS.
2708                  * However, we can't do that check here as get_progbits()
2709                  * resets the type.
2710                  */
2711                 if (strcmp(shstrtab + shp->sh_name, ".bss") == 0)
2712                         continue;
2713 #ifdef  KOBJ_DEBUG
2714                 if (kobj_debug & D_DEBUG)
2715                         _kobj_printf(ops,
2716                             "krtld: crypto_es_hash: updating hash with"
2717                             " %s data size=%lx\n", shstrtab + shp->sh_name,
2718                             (size_t)shp->sh_size);
2719 #endif
2720                 ASSERT(shp->sh_addr != 0);
2721                 SHA1Update(&ctx, (const uint8_t *)shp->sh_addr, shp->sh_size);
2722         }
2723 
2724         SHA1Final((uchar_t *)hash, &ctx);
2725 }
2726 
2727 /*
2728  * Get the .SUNW_signature section for the module, it it exists.
2729  *
2730  * This section exists only for crypto modules. None of the
2731  * primary modules have this section currently.
2732  */
2733 static void
2734 get_signature(struct module *mp, struct _buf *file)
2735 {
2736         char *shstrtab, *sigdata = NULL;
2737         size_t shstrlen;
2738         Shdr *shp;
2739         uint_t i;
2740 
2741         if (mp->hdr.e_shstrndx >= mp->hdr.e_shnum) {
2742                 _kobj_printf(ops, "krtld: get_signature: %s, ",
2743                     mp->filename);
2744                 _kobj_printf(ops, "corrupt e_shstrndx %u\n",
2745                     mp->hdr.e_shstrndx);
2746                 return;
2747         }
2748 
2749         shp = (Shdr *)(mp->shdrs + mp->hdr.e_shstrndx * mp->hdr.e_shentsize);
2750         shstrlen = shp->sh_size;
2751         shstrtab = kobj_alloc(shstrlen, KM_WAIT|KM_TMP);
2752 
2753         if (kobj_read_file(file, shstrtab, shstrlen, shp->sh_offset) < 0) {
2754                 _kobj_printf(ops, "krtld: get_signature: %s, ",
2755                     mp->filename);
2756                 _kobj_printf(ops, "error reading section %u\n",
2757                     mp->hdr.e_shstrndx);
2758                 kobj_free(shstrtab, shstrlen);
2759                 return;
2760         }
2761 
2762         for (i = 0; i < mp->hdr.e_shnum; i++) {
2763                 shp = (Shdr *)(mp->shdrs + i * mp->hdr.e_shentsize);
2764                 if (shp->sh_size != 0 && shp->sh_name < shstrlen &&
2765                     strcmp(shstrtab + shp->sh_name,
2766                     ELF_SIGNATURE_SECTION) == 0) {
2767                         filesig_vers_t filesig_version;
2768                         size_t sigsize = shp->sh_size + SHA1_DIGEST_LENGTH;
2769                         sigdata = kobj_alloc(sigsize, KM_WAIT|KM_SCRATCH);
2770 
2771                         if (kobj_read_file(file, sigdata, shp->sh_size,
2772                             shp->sh_offset) < 0) {
2773                                 _kobj_printf(ops, "krtld: get_signature: %s,"
2774                                     " error reading .SUNW_signature data\n",
2775                                     mp->filename);
2776                                 kobj_free(sigdata, sigsize);
2777                                 kobj_free(shstrtab, shstrlen);
2778                                 return;
2779                         }
2780                         filesig_version = ((struct filesignatures *)sigdata)->
2781                             filesig_sig.filesig_version;
2782                         if (!(filesig_version == FILESIG_VERSION1 ||
2783                             filesig_version == FILESIG_VERSION3)) {
2784                                 /* skip versions we don't understand */
2785                                 kobj_free(sigdata, sigsize);
2786                                 kobj_free(shstrtab, shstrlen);
2787                                 return;
2788                         }
2789 
2790                         mp->sigdata = sigdata;
2791                         mp->sigsize = sigsize;
2792                         break;
2793                 }
2794         }
2795 
2796         if (sigdata != NULL) {
2797                 crypto_es_hash(mp, sigdata + shp->sh_size, shstrtab);
2798         }
2799 
2800         kobj_free(shstrtab, shstrlen);
2801 }
2802 
2803 static void
2804 add_dependent(struct module *mp, struct module *dep)
2805 {
2806         struct module_list *lp;
2807 
2808         for (lp = mp->head; lp; lp = lp->next) {
2809                 if (lp->mp == dep)
2810                         return; /* already on the list */
2811         }
2812 
2813         if (lp == NULL) {
2814                 lp = kobj_zalloc(sizeof (*lp), KM_WAIT);
2815 
2816                 lp->mp = dep;
2817                 lp->next = NULL;
2818                 if (mp->tail)
2819                         mp->tail->next = lp;
2820                 else
2821                         mp->head = lp;
2822                 mp->tail = lp;
2823         }
2824 }
2825 
2826 static int
2827 do_dependents(struct modctl *modp, char *modname, size_t modnamelen)
2828 {
2829         struct module *mp;
2830         struct modctl *req;
2831         char *d, *p, *q;
2832         int c;
2833         char *err_modname = NULL;
2834 
2835         mp = modp->mod_mp;
2836 
2837         if ((p = mp->depends_on) == NULL)
2838                 return (0);
2839 
2840         for (;;) {
2841                 /*
2842                  * Skip space.
2843                  */
2844                 while (*p && (*p == ' ' || *p == '\t'))
2845                         p++;
2846                 /*
2847                  * Get module name.
2848                  */
2849                 d = p;
2850                 q = modname;
2851                 c = 0;
2852                 while (*p && *p != ' ' && *p != '\t') {
2853                         if (c < modnamelen - 1) {
2854                                 *q++ = *p;
2855                                 c++;
2856                         }
2857                         p++;
2858                 }
2859 
2860                 if (q == modname)
2861                         break;
2862 
2863                 if (c == modnamelen - 1) {
2864                         char *dep = kobj_alloc(p - d + 1, KM_WAIT|KM_TMP);
2865 
2866                         (void) strncpy(dep, d,  p - d + 1);
2867                         dep[p - d] = '\0';
2868 
2869                         _kobj_printf(ops, "%s: dependency ", modp->mod_modname);
2870                         _kobj_printf(ops, "'%s' too long ", dep);
2871                         _kobj_printf(ops, "(max %d chars)\n", (int)modnamelen);
2872 
2873                         kobj_free(dep, p - d + 1);
2874 
2875                         return (-1);
2876                 }
2877 
2878                 *q = '\0';
2879                 if ((req = mod_load_requisite(modp, modname)) == NULL) {
2880 #ifndef KOBJ_DEBUG
2881                         if (_moddebug & MODDEBUG_LOADMSG) {
2882 #endif  /* KOBJ_DEBUG */
2883                                 _kobj_printf(ops,
2884                                     "%s: unable to resolve dependency, ",
2885                                     modp->mod_modname);
2886                                 _kobj_printf(ops, "cannot load module '%s'\n",
2887                                     modname);
2888 #ifndef KOBJ_DEBUG
2889                         }
2890 #endif  /* KOBJ_DEBUG */
2891                         if (err_modname == NULL) {
2892                                 /*
2893                                  * This must be the same size as the modname
2894                                  * one.
2895                                  */
2896                                 err_modname = kobj_zalloc(MODMAXNAMELEN,
2897                                     KM_WAIT);
2898 
2899                                 /*
2900                                  * We can use strcpy() here without fearing
2901                                  * the NULL terminator because the size of
2902                                  * err_modname is the same as one of modname,
2903                                  * and it's filled with zeros.
2904                                  */
2905                                 (void) strcpy(err_modname, modname);
2906                         }
2907                         continue;
2908                 }
2909 
2910                 add_dependent(mp, req->mod_mp);
2911                 mod_release_mod(req);
2912 
2913         }
2914 
2915         if (err_modname != NULL) {
2916                 /*
2917                  * Copy the first module name where you detect an error to keep
2918                  * its behavior the same as before.
2919                  * This way keeps minimizing the memory use for error
2920                  * modules, and this might be important at boot time because
2921                  * the memory usage is a crucial factor for booting in most
2922                  * cases. You can expect more verbose messages when using
2923                  * a debug kernel or setting a bit in moddebug.
2924                  */
2925                 bzero(modname, MODMAXNAMELEN);
2926                 (void) strcpy(modname, err_modname);
2927                 kobj_free(err_modname, MODMAXNAMELEN);
2928                 return (-1);
2929         }
2930 
2931         return (0);
2932 }
2933 
2934 static int
2935 do_common(struct module *mp)
2936 {
2937         int err;
2938 
2939         /*
2940          * first time through, assign all symbols defined in other
2941          * modules, and count up how much common space will be needed
2942          * (bss_size and bss_align)
2943          */
2944         if ((err = do_symbols(mp, 0)) < 0)
2945                 return (err);
2946         /*
2947          * increase bss_size by the maximum delta that could be
2948          * computed by the ALIGN below
2949          */
2950         mp->bss_size += mp->bss_align;
2951         if (mp->bss_size) {
2952                 if (standalone)
2953                         mp->bss = (uintptr_t)kobj_segbrk(&_edata, mp->bss_size,
2954                             MINALIGN, 0);
2955                 else
2956                         mp->bss = (uintptr_t)vmem_alloc(data_arena,
2957                             mp->bss_size, VM_SLEEP | VM_BESTFIT);
2958                 bzero((void *)mp->bss, mp->bss_size);
2959                 /* now assign addresses to all common symbols */
2960                 if ((err = do_symbols(mp, ALIGN(mp->bss, mp->bss_align))) < 0)
2961                         return (err);
2962         }
2963         return (0);
2964 }
2965 
2966 static int
2967 do_symbols(struct module *mp, Elf64_Addr bss_base)
2968 {
2969         int bss_align;
2970         uintptr_t bss_ptr;
2971         int err;
2972         int i;
2973         Sym *sp, *sp1;
2974         char *name;
2975         int assign;
2976         int resolved = 1;
2977 
2978         /*
2979          * Nothing left to do (optimization).
2980          */
2981         if (mp->flags & KOBJ_RESOLVED)
2982                 return (0);
2983 
2984         assign = (bss_base) ? 1 : 0;
2985         bss_ptr = bss_base;
2986         bss_align = 0;
2987         err = 0;
2988 
2989         for (i = 1; i < mp->nsyms; i++) {
2990                 sp = (Sym *)(mp->symtbl + mp->symhdr->sh_entsize * i);
2991                 /*
2992                  * we know that st_name is in bounds, since get_sections
2993                  * has already checked all of the symbols
2994                  */
2995                 name = mp->strings + sp->st_name;
2996                 if (sp->st_shndx != SHN_UNDEF && sp->st_shndx != SHN_COMMON)
2997                         continue;
2998 #if defined(__sparc)
2999                 /*
3000                  * Register symbols are ignored in the kernel
3001                  */
3002                 if (ELF_ST_TYPE(sp->st_info) == STT_SPARC_REGISTER) {
3003                         if (*name != '\0') {
3004                                 _kobj_printf(ops, "%s: named REGISTER symbol ",
3005                                     mp->filename);
3006                                 _kobj_printf(ops, "not supported '%s'\n",
3007                                     name);
3008                                 err = DOSYM_UNDEF;
3009                         }
3010                         continue;
3011                 }
3012 #endif  /* __sparc */
3013                 /*
3014                  * TLS symbols are ignored in the kernel
3015                  */
3016                 if (ELF_ST_TYPE(sp->st_info) == STT_TLS) {
3017                         _kobj_printf(ops, "%s: TLS symbol ",
3018                             mp->filename);
3019                         _kobj_printf(ops, "not supported '%s'\n",
3020                             name);
3021                         err = DOSYM_UNDEF;
3022                         continue;
3023                 }
3024 
3025                 if (ELF_ST_BIND(sp->st_info) != STB_LOCAL) {
3026                         if ((sp1 = kobj_lookup_all(mp, name, 0)) != NULL) {
3027                                 sp->st_shndx = SHN_ABS;
3028                                 sp->st_value = sp1->st_value;
3029                                 continue;
3030                         }
3031                 }
3032 
3033                 if (sp->st_shndx == SHN_UNDEF) {
3034                         resolved = 0;
3035 
3036                         if (strncmp(name, sdt_prefix, strlen(sdt_prefix)) == 0)
3037                                 continue;
3038 
3039                         /*
3040                          * If it's not a weak reference and it's
3041                          * not a primary object, it's an error.
3042                          * (Primary objects may take more than
3043                          * one pass to resolve)
3044                          */
3045                         if (!(mp->flags & KOBJ_PRIM) &&
3046                             ELF_ST_BIND(sp->st_info) != STB_WEAK) {
3047                                 _kobj_printf(ops, "%s: undefined symbol",
3048                                     mp->filename);
3049                                 _kobj_printf(ops, " '%s'\n", name);
3050                                 /*
3051                                  * Try to determine whether this symbol
3052                                  * represents a dependency on obsolete
3053                                  * unsafe driver support.  This is just
3054                                  * to make the warning more informative.
3055                                  */
3056                                 if (strcmp(name, "sleep") == 0 ||
3057                                     strcmp(name, "unsleep") == 0 ||
3058                                     strcmp(name, "wakeup") == 0 ||
3059                                     strcmp(name, "bsd_compat_ioctl") == 0 ||
3060                                     strcmp(name, "unsafe_driver") == 0 ||
3061                                     strncmp(name, "spl", 3) == 0 ||
3062                                     strncmp(name, "i_ddi_spl", 9) == 0)
3063                                         err = DOSYM_UNSAFE;
3064                                 if (err == 0)
3065                                         err = DOSYM_UNDEF;
3066                         }
3067                         continue;
3068                 }
3069                 /*
3070                  * It's a common symbol - st_value is the
3071                  * required alignment.
3072                  */
3073                 if (sp->st_value > bss_align)
3074                         bss_align = sp->st_value;
3075                 bss_ptr = ALIGN(bss_ptr, sp->st_value);
3076                 if (assign) {
3077                         sp->st_shndx = SHN_ABS;
3078                         sp->st_value = bss_ptr;
3079                 }
3080                 bss_ptr += sp->st_size;
3081         }
3082         if (err)
3083                 return (err);
3084         if (assign == 0 && mp->bss == 0) {
3085                 mp->bss_align = bss_align;
3086                 mp->bss_size = bss_ptr;
3087         } else if (resolved) {
3088                 mp->flags |= KOBJ_RESOLVED;
3089         }
3090 
3091         return (0);
3092 }
3093 
3094 uint_t
3095 kobj_hash_name(const char *p)
3096 {
3097         uint_t g;
3098         uint_t hval;
3099 
3100         hval = 0;
3101         while (*p) {
3102                 hval = (hval << 4) + *p++;
3103                 if ((g = (hval & 0xf0000000)) != 0)
3104                         hval ^= g >> 24;
3105                 hval &= ~g;
3106         }
3107         return (hval);
3108 }
3109 
3110 /* look for name in all modules */
3111 uintptr_t
3112 kobj_getsymvalue(char *name, int kernelonly)
3113 {
3114         Sym             *sp;
3115         struct modctl   *modp;
3116         struct module   *mp;
3117         uintptr_t       value = 0;
3118 
3119         if ((sp = kobj_lookup_kernel(name)) != NULL)
3120                 return ((uintptr_t)sp->st_value);
3121 
3122         if (kernelonly)
3123                 return (0);     /* didn't find it in the kernel so give up */
3124 
3125         mutex_enter(&mod_lock);
3126         modp = &modules;
3127         do {
3128                 mp = (struct module *)modp->mod_mp;
3129                 if (mp && !(mp->flags & KOBJ_PRIM) && modp->mod_loaded &&
3130                     (sp = lookup_one(mp, name))) {
3131                         value = (uintptr_t)sp->st_value;
3132                         break;
3133                 }
3134         } while ((modp = modp->mod_next) != &modules);
3135         mutex_exit(&mod_lock);
3136         return (value);
3137 }
3138 
3139 /* look for a symbol near value. */
3140 char *
3141 kobj_getsymname(uintptr_t value, ulong_t *offset)
3142 {
3143         char *name = NULL;
3144         struct modctl *modp;
3145 
3146         struct modctl_list *lp;
3147         struct module *mp;
3148 
3149         /*
3150          * Loop through the primary kernel modules.
3151          */
3152         for (lp = kobj_lm_lookup(KOBJ_LM_PRIMARY); lp; lp = lp->modl_next) {
3153                 mp = mod(lp);
3154 
3155                 if ((name = kobj_searchsym(mp, value, offset)) != NULL)
3156                         return (name);
3157         }
3158 
3159         mutex_enter(&mod_lock);
3160         modp = &modules;
3161         do {
3162                 mp = (struct module *)modp->mod_mp;
3163                 if (mp && !(mp->flags & KOBJ_PRIM) && modp->mod_loaded &&
3164                     (name = kobj_searchsym(mp, value, offset)))
3165                         break;
3166         } while ((modp = modp->mod_next) != &modules);
3167         mutex_exit(&mod_lock);
3168         return (name);
3169 }
3170 
3171 /* return address of symbol and size */
3172 
3173 uintptr_t
3174 kobj_getelfsym(char *name, void *mp, int *size)
3175 {
3176         Sym *sp;
3177 
3178         if (mp == NULL)
3179                 sp = kobj_lookup_kernel(name);
3180         else
3181                 sp = lookup_one(mp, name);
3182 
3183         if (sp == NULL)
3184                 return (0);
3185 
3186         *size = (int)sp->st_size;
3187         return ((uintptr_t)sp->st_value);
3188 }
3189 
3190 uintptr_t
3191 kobj_lookup(struct module *mod, const char *name)
3192 {
3193         Sym *sp;
3194 
3195         sp = lookup_one(mod, name);
3196 
3197         if (sp == NULL)
3198                 return (0);
3199 
3200         return ((uintptr_t)sp->st_value);
3201 }
3202 
3203 char *
3204 kobj_searchsym(struct module *mp, uintptr_t value, ulong_t *offset)
3205 {
3206         Sym *symtabptr;
3207         char *strtabptr;
3208         int symnum;
3209         Sym *sym;
3210         Sym *cursym;
3211         uintptr_t curval;
3212 
3213         *offset = (ulong_t)-1l;         /* assume not found */
3214         cursym  = NULL;
3215 
3216         if (kobj_addrcheck(mp, (void *)value) != 0)
3217                 return (NULL);          /* not in this module */
3218 
3219         strtabptr  = mp->strings;
3220         symtabptr  = (Sym *)mp->symtbl;
3221 
3222         /*
3223          * Scan the module's symbol table for a symbol <= value
3224          */
3225         for (symnum = 1, sym = symtabptr + 1;
3226             symnum < mp->nsyms; symnum++, sym = (Sym *)
3227             ((uintptr_t)sym + mp->symhdr->sh_entsize)) {
3228                 if (ELF_ST_BIND(sym->st_info) != STB_GLOBAL) {
3229                         if (ELF_ST_BIND(sym->st_info) != STB_LOCAL)
3230                                 continue;
3231                         if (ELF_ST_TYPE(sym->st_info) != STT_OBJECT &&
3232                             ELF_ST_TYPE(sym->st_info) != STT_FUNC)
3233                                 continue;
3234                 }
3235 
3236                 curval = (uintptr_t)sym->st_value;
3237 
3238                 if (curval > value)
3239                         continue;
3240 
3241                 /*
3242                  * If one or both are functions...
3243                  */
3244                 if (ELF_ST_TYPE(sym->st_info) == STT_FUNC || (cursym != NULL &&
3245                     ELF_ST_TYPE(cursym->st_info) == STT_FUNC)) {
3246                         /* Ignore if the address is out of the bounds */
3247                         if (value - sym->st_value >= sym->st_size)
3248                                 continue;
3249 
3250                         if (cursym != NULL &&
3251                             ELF_ST_TYPE(cursym->st_info) == STT_FUNC) {
3252                                 /* Prefer the function to the non-function */
3253                                 if (ELF_ST_TYPE(sym->st_info) != STT_FUNC)
3254                                         continue;
3255 
3256                                 /* Prefer the larger of the two functions */
3257                                 if (sym->st_size <= cursym->st_size)
3258                                         continue;
3259                         }
3260                 } else if (value - curval >= *offset) {
3261                         continue;
3262                 }
3263 
3264                 *offset = (ulong_t)(value - curval);
3265                 cursym = sym;
3266         }
3267         if (cursym == NULL)
3268                 return (NULL);
3269 
3270         return (strtabptr + cursym->st_name);
3271 }
3272 
3273 Sym *
3274 kobj_lookup_all(struct module *mp, char *name, int include_self)
3275 {
3276         Sym *sp;
3277         struct module_list *mlp;
3278         struct modctl_list *clp;
3279         struct module *mmp;
3280 
3281         if (include_self && (sp = lookup_one(mp, name)) != NULL)
3282                 return (sp);
3283 
3284         for (mlp = mp->head; mlp; mlp = mlp->next) {
3285                 if ((sp = lookup_one(mlp->mp, name)) != NULL &&
3286                     ELF_ST_BIND(sp->st_info) != STB_LOCAL)
3287                         return (sp);
3288         }
3289 
3290         /*
3291          * Loop through the primary kernel modules.
3292          */
3293         for (clp = kobj_lm_lookup(KOBJ_LM_PRIMARY); clp; clp = clp->modl_next) {
3294                 mmp = mod(clp);
3295 
3296                 if (mmp == NULL || mp == mmp)
3297                         continue;
3298 
3299                 if ((sp = lookup_one(mmp, name)) != NULL &&
3300                     ELF_ST_BIND(sp->st_info) != STB_LOCAL)
3301                         return (sp);
3302         }
3303         return (NULL);
3304 }
3305 
3306 Sym *
3307 kobj_lookup_kernel(const char *name)
3308 {
3309         struct modctl_list *lp;
3310         struct module *mp;
3311         Sym *sp;
3312 
3313         /*
3314          * Loop through the primary kernel modules.
3315          */
3316         for (lp = kobj_lm_lookup(KOBJ_LM_PRIMARY); lp; lp = lp->modl_next) {
3317                 mp = mod(lp);
3318 
3319                 if (mp == NULL)
3320                         continue;
3321 
3322                 if ((sp = lookup_one(mp, name)) != NULL)
3323                         return (sp);
3324         }
3325         return (NULL);
3326 }
3327 
3328 static Sym *
3329 lookup_one(struct module *mp, const char *name)
3330 {
3331         symid_t *ip;
3332         char *name1;
3333         Sym *sp;
3334 
3335         for (ip = &mp->buckets[kobj_hash_name(name) % mp->hashsize]; *ip;
3336             ip = &mp->chains[*ip]) {
3337                 sp = (Sym *)(mp->symtbl +
3338                     mp->symhdr->sh_entsize * *ip);
3339                 name1 = mp->strings + sp->st_name;
3340                 if (strcmp(name, name1) == 0 &&
3341                     ELF_ST_TYPE(sp->st_info) != STT_FILE &&
3342                     sp->st_shndx != SHN_UNDEF &&
3343                     sp->st_shndx != SHN_COMMON)
3344                         return (sp);
3345         }
3346         return (NULL);
3347 }
3348 
3349 /*
3350  * Lookup a given symbol pointer in the module's symbol hash.  If the symbol
3351  * is hashed, return the symbol pointer; otherwise return NULL.
3352  */
3353 static Sym *
3354 sym_lookup(struct module *mp, Sym *ksp)
3355 {
3356         char *name = mp->strings + ksp->st_name;
3357         symid_t *ip;
3358         Sym *sp;
3359 
3360         for (ip = &mp->buckets[kobj_hash_name(name) % mp->hashsize]; *ip;
3361             ip = &mp->chains[*ip]) {
3362                 sp = (Sym *)(mp->symtbl + mp->symhdr->sh_entsize * *ip);
3363                 if (sp == ksp)
3364                         return (ksp);
3365         }
3366         return (NULL);
3367 }
3368 
3369 static void
3370 sym_insert(struct module *mp, char *name, symid_t index)
3371 {
3372         symid_t *ip;
3373 
3374 #ifdef KOBJ_DEBUG
3375         if (kobj_debug & D_SYMBOLS) {
3376                 static struct module *lastmp = NULL;
3377                 Sym *sp;
3378                 if (lastmp != mp) {
3379                         _kobj_printf(ops,
3380                             "krtld: symbol entry: file=%s\n",
3381                             mp->filename);
3382                         _kobj_printf(ops,
3383                             "krtld:\tsymndx\tvalue\t\t"
3384                             "symbol name\n");
3385                         lastmp = mp;
3386                 }
3387                 sp = (Sym *)(mp->symtbl +
3388                     index * mp->symhdr->sh_entsize);
3389                 _kobj_printf(ops, "krtld:\t[%3d]", index);
3390                 _kobj_printf(ops, "\t0x%lx", sp->st_value);
3391                 _kobj_printf(ops, "\t%s\n", name);
3392         }
3393 #endif
3394 
3395         for (ip = &mp->buckets[kobj_hash_name(name) % mp->hashsize]; *ip;
3396             ip = &mp->chains[*ip]) {
3397                 ;
3398         }
3399         *ip = index;
3400 }
3401 
3402 struct modctl *
3403 kobj_boot_mod_lookup(const char *modname)
3404 {
3405         struct modctl *mctl = kobj_modules;
3406 
3407         do {
3408                 if (strcmp(modname, mctl->mod_modname) == 0)
3409                         return (mctl);
3410         } while ((mctl = mctl->mod_next) != kobj_modules);
3411 
3412         return (NULL);
3413 }
3414 
3415 /*
3416  * Determine if the module exists.
3417  */
3418 int
3419 kobj_path_exists(char *name, int use_path)
3420 {
3421         struct _buf *file;
3422 
3423         file = kobj_open_path(name, use_path, 1);
3424 #ifdef  MODDIR_SUFFIX
3425         if (file == (struct _buf *)-1)
3426                 file = kobj_open_path(name, use_path, 0);
3427 #endif  /* MODDIR_SUFFIX */
3428         if (file == (struct _buf *)-1)
3429                 return (0);
3430         kobj_close_file(file);
3431         return (1);
3432 }
3433 
3434 /*
3435  * fullname is dynamically allocated to be able to hold the
3436  * maximum size string that can be constructed from name.
3437  * path is exactly like the shell PATH variable.
3438  */
3439 struct _buf *
3440 kobj_open_path(char *name, int use_path, int use_moddir_suffix)
3441 {
3442         char *p, *q;
3443         char *pathp;
3444         char *pathpsave;
3445         char *fullname;
3446         int maxpathlen;
3447         struct _buf *file;
3448 
3449 #if !defined(MODDIR_SUFFIX)
3450         use_moddir_suffix = B_FALSE;
3451 #endif
3452 
3453         if (!use_path)
3454                 pathp = "";             /* use name as specified */
3455         else
3456                 pathp = kobj_module_path;
3457                                         /* use configured default path */
3458 
3459         pathpsave = pathp;              /* keep this for error reporting */
3460 
3461         /*
3462          * Allocate enough space for the largest possible fullname.
3463          * since path is of the form <directory> : <directory> : ...
3464          * we're potentially allocating a little more than we need to
3465          * but we'll allocate the exact amount when we find the right directory.
3466          * (The + 3 below is one for NULL terminator and one for the '/'
3467          * we might have to add at the beginning of path and one for
3468          * the '/' between path and name.)
3469          */
3470         maxpathlen = strlen(pathp) + strlen(name) + 3;
3471         /* sizeof includes null */
3472         maxpathlen += sizeof (slash_moddir_suffix_slash) - 1;
3473         fullname = kobj_zalloc(maxpathlen, KM_WAIT);
3474 
3475         for (;;) {
3476                 p = fullname;
3477                 if (*pathp != '\0' && *pathp != '/')
3478                         *p++ = '/';     /* path must start with '/' */
3479                 while (*pathp && *pathp != ':' && *pathp != ' ')
3480                         *p++ = *pathp++;
3481                 if (p != fullname && p[-1] != '/')
3482                         *p++ = '/';
3483                 if (use_moddir_suffix) {
3484                         char *b = basename(name);
3485                         char *s;
3486 
3487                         /* copy everything up to the base name */
3488                         q = name;
3489                         while (q != b && *q)
3490                                 *p++ = *q++;
3491                         s = slash_moddir_suffix_slash;
3492                         while (*s)
3493                                 *p++ = *s++;
3494                         /* copy the rest */
3495                         while (*b)
3496                                 *p++ = *b++;
3497                 } else {
3498                         q = name;
3499                         while (*q)
3500                                 *p++ = *q++;
3501                 }
3502                 *p = 0;
3503                 if ((file = kobj_open_file(fullname)) != (struct _buf *)-1) {
3504                         kobj_free(fullname, maxpathlen);
3505                         return (file);
3506                 }
3507                 while (*pathp == ' ' || *pathp == ':')
3508                         pathp++;
3509                 if (*pathp == 0)
3510                         break;
3511 
3512         }
3513         kobj_free(fullname, maxpathlen);
3514         if (_moddebug & MODDEBUG_ERRMSG) {
3515                 _kobj_printf(ops, "can't open %s,", name);
3516                 _kobj_printf(ops, " path is %s\n", pathpsave);
3517         }
3518         return ((struct _buf *)-1);
3519 }
3520 
3521 intptr_t
3522 kobj_open(char *filename)
3523 {
3524         struct vnode *vp;
3525         int fd;
3526 
3527         if (_modrootloaded) {
3528                 struct kobjopen_tctl *ltp = kobjopen_alloc(filename);
3529                 int Errno;
3530 
3531                 /*
3532                  * Hand off the open to a thread who has a
3533                  * stack size capable handling the request.
3534                  */
3535                 if (curthread != &t0) {
3536                         (void) thread_create(NULL, DEFAULTSTKSZ * 2,
3537                             kobjopen_thread, ltp, 0, &p0, TS_RUN, maxclsyspri);
3538                         sema_p(&ltp->sema);
3539                         Errno = ltp->Errno;
3540                         vp = ltp->vp;
3541                 } else {
3542                         /*
3543                          * 1098067: module creds should not be those of the
3544                          * caller
3545                          */
3546                         cred_t *saved_cred = curthread->t_cred;
3547                         curthread->t_cred = kcred;
3548                         Errno = vn_openat(filename, UIO_SYSSPACE, FREAD, 0, &vp,
3549                             0, 0, rootdir, -1);
3550                         curthread->t_cred = saved_cred;
3551                 }
3552                 kobjopen_free(ltp);
3553 
3554                 if (Errno) {
3555                         if (_moddebug & MODDEBUG_ERRMSG) {
3556                                 _kobj_printf(ops,
3557                                     "kobj_open: vn_open of %s fails, ",
3558                                     filename);
3559                                 _kobj_printf(ops, "Errno = %d\n", Errno);
3560                         }
3561                         return (-1);
3562                 } else {
3563                         if (_moddebug & MODDEBUG_ERRMSG) {
3564                                 _kobj_printf(ops, "kobj_open: '%s'", filename);
3565                                 _kobj_printf(ops, " vp = %p\n", vp);
3566                         }
3567                         return ((intptr_t)vp);
3568                 }
3569         } else {
3570                 fd = kobj_boot_open(filename, 0);
3571 
3572                 if (_moddebug & MODDEBUG_ERRMSG) {
3573                         if (fd < 0)
3574                                 _kobj_printf(ops,
3575                                     "kobj_open: can't open %s\n", filename);
3576                         else {
3577                                 _kobj_printf(ops, "kobj_open: '%s'", filename);
3578                                 _kobj_printf(ops, " descr = 0x%x\n", fd);
3579                         }
3580                 }
3581                 return ((intptr_t)fd);
3582         }
3583 }
3584 
3585 /*
3586  * Calls to kobj_open() are handled off to this routine as a separate thread.
3587  */
3588 static void
3589 kobjopen_thread(struct kobjopen_tctl *ltp)
3590 {
3591         kmutex_t        cpr_lk;
3592         callb_cpr_t     cpr_i;
3593 
3594         mutex_init(&cpr_lk, NULL, MUTEX_DEFAULT, NULL);
3595         CALLB_CPR_INIT(&cpr_i, &cpr_lk, callb_generic_cpr, "kobjopen");
3596         ltp->Errno = vn_open(ltp->name, UIO_SYSSPACE, FREAD, 0, &(ltp->vp),
3597             0, 0);
3598         sema_v(&ltp->sema);
3599         mutex_enter(&cpr_lk);
3600         CALLB_CPR_EXIT(&cpr_i);
3601         mutex_destroy(&cpr_lk);
3602         thread_exit();
3603 }
3604 
3605 /*
3606  * allocate and initialize a kobjopen thread structure
3607  */
3608 static struct kobjopen_tctl *
3609 kobjopen_alloc(char *filename)
3610 {
3611         struct kobjopen_tctl *ltp = kmem_zalloc(sizeof (*ltp), KM_SLEEP);
3612 
3613         ASSERT(filename != NULL);
3614 
3615         ltp->name = kmem_alloc(strlen(filename) + 1, KM_SLEEP);
3616         bcopy(filename, ltp->name, strlen(filename) + 1);
3617         sema_init(&ltp->sema, 0, NULL, SEMA_DEFAULT, NULL);
3618         return (ltp);
3619 }
3620 
3621 /*
3622  * free a kobjopen thread control structure
3623  */
3624 static void
3625 kobjopen_free(struct kobjopen_tctl *ltp)
3626 {
3627         sema_destroy(&ltp->sema);
3628         kmem_free(ltp->name, strlen(ltp->name) + 1);
3629         kmem_free(ltp, sizeof (*ltp));
3630 }
3631 
3632 int
3633 kobj_read(intptr_t descr, char *buf, uint_t size, uint_t offset)
3634 {
3635         int stat;
3636         ssize_t resid;
3637 
3638         if (_modrootloaded) {
3639                 if ((stat = vn_rdwr(UIO_READ, (struct vnode *)descr, buf, size,
3640                     (offset_t)offset, UIO_SYSSPACE, 0, (rlim64_t)0, CRED(),
3641                     &resid)) != 0) {
3642                         _kobj_printf(ops,
3643                             "vn_rdwr failed with error 0x%x\n", stat);
3644                         return (-1);
3645                 }
3646                 return (size - resid);
3647         } else {
3648                 int count = 0;
3649 
3650                 if (kobj_boot_seek((int)descr, (off_t)0, offset) != 0) {
3651                         _kobj_printf(ops,
3652                             "kobj_read: seek 0x%x failed\n", offset);
3653                         return (-1);
3654                 }
3655 
3656                 count = kobj_boot_read((int)descr, buf, size);
3657                 if (count < size) {
3658                         if (_moddebug & MODDEBUG_ERRMSG) {
3659                                 _kobj_printf(ops,
3660                                     "kobj_read: req %d bytes, ", size);
3661                                 _kobj_printf(ops, "got %d\n", count);
3662                         }
3663                 }
3664                 return (count);
3665         }
3666 }
3667 
3668 void
3669 kobj_close(intptr_t descr)
3670 {
3671         if (_moddebug & MODDEBUG_ERRMSG)
3672                 _kobj_printf(ops, "kobj_close: 0x%lx\n", descr);
3673 
3674         if (_modrootloaded) {
3675                 struct vnode *vp = (struct vnode *)descr;
3676                 (void) VOP_CLOSE(vp, FREAD, 1, (offset_t)0, CRED(), NULL);
3677                 VN_RELE(vp);
3678         } else
3679                 (void) kobj_boot_close((int)descr);
3680 }
3681 
3682 int
3683 kobj_fstat(intptr_t descr, struct bootstat *buf)
3684 {
3685         if (buf == NULL)
3686                 return (-1);
3687 
3688         if (_modrootloaded) {
3689                 vattr_t vattr;
3690                 struct vnode *vp = (struct vnode *)descr;
3691                 if (VOP_GETATTR(vp, &vattr, 0, kcred, NULL) != 0)
3692                         return (-1);
3693 
3694                 /*
3695                  * The vattr and bootstat structures are similar, but not
3696                  * identical.  We do our best to fill in the bootstat structure
3697                  * from the contents of vattr (transfering only the ones that
3698                  * are obvious.
3699                  */
3700 
3701                 buf->st_mode = (uint32_t)vattr.va_mode;
3702                 buf->st_nlink = (uint32_t)vattr.va_nlink;
3703                 buf->st_uid = (int32_t)vattr.va_uid;
3704                 buf->st_gid = (int32_t)vattr.va_gid;
3705                 buf->st_rdev = (uint64_t)vattr.va_rdev;
3706                 buf->st_size = (uint64_t)vattr.va_size;
3707                 buf->st_atim.tv_sec = (int64_t)vattr.va_atime.tv_sec;
3708                 buf->st_atim.tv_nsec = (int64_t)vattr.va_atime.tv_nsec;
3709                 buf->st_mtim.tv_sec = (int64_t)vattr.va_mtime.tv_sec;
3710                 buf->st_mtim.tv_nsec = (int64_t)vattr.va_mtime.tv_nsec;
3711                 buf->st_ctim.tv_sec = (int64_t)vattr.va_ctime.tv_sec;
3712                 buf->st_ctim.tv_nsec = (int64_t)vattr.va_ctime.tv_nsec;
3713                 buf->st_blksize = (int32_t)vattr.va_blksize;
3714                 buf->st_blocks = (int64_t)vattr.va_nblocks;
3715 
3716                 return (0);
3717         }
3718 
3719         return (kobj_boot_fstat((int)descr, buf));
3720 }
3721 
3722 
3723 struct _buf *
3724 kobj_open_file(char *name)
3725 {
3726         struct _buf *file;
3727         struct compinfo cbuf;
3728         intptr_t fd;
3729 
3730         if ((fd = kobj_open(name)) == -1) {
3731                 return ((struct _buf *)-1);
3732         }
3733 
3734         file = kobj_zalloc(sizeof (struct _buf), KM_WAIT|KM_TMP);
3735         file->_fd = fd;
3736         file->_name = kobj_alloc(strlen(name)+1, KM_WAIT|KM_TMP);
3737         file->_cnt = file->_size = file->_off = 0;
3738         file->_ln = 1;
3739         file->_ptr = file->_base;
3740         (void) strcpy(file->_name, name);
3741 
3742         /*
3743          * Before root is mounted, we must check
3744          * for a compressed file and do our own
3745          * buffering.
3746          */
3747         if (_modrootloaded) {
3748                 file->_base = kobj_zalloc(MAXBSIZE, KM_WAIT);
3749                 file->_bsize = MAXBSIZE;
3750 
3751                 /* Check if the file is compressed */
3752                 file->_iscmp = kobj_is_compressed(fd);
3753         } else {
3754                 if (kobj_boot_compinfo(fd, &cbuf) != 0) {
3755                         kobj_close_file(file);
3756                         return ((struct _buf *)-1);
3757                 }
3758                 file->_iscmp = cbuf.iscmp;
3759                 if (file->_iscmp) {
3760                         if (kobj_comp_setup(file, &cbuf) != 0) {
3761                                 kobj_close_file(file);
3762                                 return ((struct _buf *)-1);
3763                         }
3764                 } else {
3765                         file->_base = kobj_zalloc(cbuf.blksize, KM_WAIT|KM_TMP);
3766                         file->_bsize = cbuf.blksize;
3767                 }
3768         }
3769         return (file);
3770 }
3771 
3772 static int
3773 kobj_comp_setup(struct _buf *file, struct compinfo *cip)
3774 {
3775         struct comphdr *hdr;
3776 
3777         /*
3778          * read the compressed image into memory,
3779          * so we can deompress from there
3780          */
3781         file->_dsize = cip->fsize;
3782         file->_dbuf = kobj_alloc(cip->fsize, KM_WAIT|KM_TMP);
3783         if (kobj_read(file->_fd, file->_dbuf, cip->fsize, 0) != cip->fsize) {
3784                 kobj_free(file->_dbuf, cip->fsize);
3785                 return (-1);
3786         }
3787 
3788         hdr = kobj_comphdr(file);
3789         if (hdr->ch_magic != CH_MAGIC_ZLIB || hdr->ch_version != CH_VERSION ||
3790             hdr->ch_algorithm != CH_ALG_ZLIB || hdr->ch_fsize == 0 ||
3791             !ISP2(hdr->ch_blksize)) {
3792                 kobj_free(file->_dbuf, cip->fsize);
3793                 return (-1);
3794         }
3795         file->_base = kobj_alloc(hdr->ch_blksize, KM_WAIT|KM_TMP);
3796         file->_bsize = hdr->ch_blksize;
3797         return (0);
3798 }
3799 
3800 void
3801 kobj_close_file(struct _buf *file)
3802 {
3803         kobj_close(file->_fd);
3804         if (file->_base != NULL)
3805                 kobj_free(file->_base, file->_bsize);
3806         if (file->_dbuf != NULL)
3807                 kobj_free(file->_dbuf, file->_dsize);
3808         kobj_free(file->_name, strlen(file->_name)+1);
3809         kobj_free(file, sizeof (struct _buf));
3810 }
3811 
3812 int
3813 kobj_read_file(struct _buf *file, char *buf, uint_t size, uint_t off)
3814 {
3815         int b_size, c_size;
3816         int b_off;      /* Offset into buffer for start of bcopy */
3817         int count = 0;
3818         int page_addr;
3819 
3820         if (_moddebug & MODDEBUG_ERRMSG) {
3821                 _kobj_printf(ops, "kobj_read_file: size=%x,", size);
3822                 _kobj_printf(ops, " offset=%x at", off);
3823                 _kobj_printf(ops, " buf=%lx\n", (uintptr_t)buf);
3824         }
3825 
3826         /*
3827          * Handle compressed (gzip for now) file here. First get the
3828          * compressed size, then read the image into memory and finally
3829          * call zlib to decompress the image at the supplied memory buffer.
3830          */
3831         if (file->_iscmp == CH_MAGIC_GZIP) {
3832                 ulong_t dlen;
3833                 vattr_t vattr;
3834                 struct vnode *vp = (struct vnode *)file->_fd;
3835                 ssize_t resid;
3836                 int err = 0;
3837 
3838                 if (VOP_GETATTR(vp, &vattr, 0, kcred, NULL) != 0)
3839                         return (-1);
3840 
3841                 file->_dbuf = kobj_alloc(vattr.va_size, KM_WAIT|KM_TMP);
3842                 file->_dsize = vattr.va_size;
3843 
3844                 /* Read the compressed file into memory */
3845                 if ((err = vn_rdwr(UIO_READ, vp, file->_dbuf, vattr.va_size,
3846                     (offset_t)(0), UIO_SYSSPACE, 0, (rlim64_t)0, CRED(),
3847                     &resid)) != 0) {
3848 
3849                         _kobj_printf(ops, "kobj_read_file :vn_rdwr() failed, "
3850                             "error code 0x%x\n", err);
3851                         return (-1);
3852                 }
3853 
3854                 dlen = size;
3855 
3856                 /* Decompress the image at the supplied memory buffer */
3857                 if ((err = z_uncompress(buf, &dlen, file->_dbuf,
3858                     vattr.va_size)) != Z_OK) {
3859                         _kobj_printf(ops, "kobj_read_file: z_uncompress "
3860                             "failed, error code : 0x%x\n", err);
3861                         return (-1);
3862                 }
3863 
3864                 if (dlen != size) {
3865                         _kobj_printf(ops, "kobj_read_file: z_uncompress "
3866                             "failed to uncompress (size returned 0x%lx , "
3867                             "expected size: 0x%x)\n", dlen, size);
3868                         return (-1);
3869                 }
3870 
3871                 return (0);
3872         }
3873 
3874         while (size) {
3875                 page_addr = F_PAGE(file, off);
3876                 b_size = file->_size;
3877                 /*
3878                  * If we have the filesystem page the caller's referring to
3879                  * and we have something in the buffer,
3880                  * satisfy as much of the request from the buffer as we can.
3881                  */
3882                 if (page_addr == file->_off && b_size > 0) {
3883                         b_off = B_OFFSET(file, off);
3884                         c_size = b_size - b_off;
3885                         /*
3886                          * If there's nothing to copy, we're at EOF.
3887                          */
3888                         if (c_size <= 0)
3889                                 break;
3890                         if (c_size > size)
3891                                 c_size = size;
3892                         if (buf) {
3893                                 if (_moddebug & MODDEBUG_ERRMSG)
3894                                         _kobj_printf(ops, "copying %x bytes\n",
3895                                             c_size);
3896                                 bcopy(file->_base+b_off, buf, c_size);
3897                                 size -= c_size;
3898                                 off += c_size;
3899                                 buf += c_size;
3900                                 count += c_size;
3901                         } else {
3902                                 _kobj_printf(ops, "kobj_read: system error");
3903                                 count = -1;
3904                                 break;
3905                         }
3906                 } else {
3907                         /*
3908                          * If the caller's offset is page aligned and
3909                          * the caller want's at least a filesystem page and
3910                          * the caller provided a buffer,
3911                          * read directly into the caller's buffer.
3912                          */
3913                         if (page_addr == off &&
3914                             (c_size = F_BLKS(file, size)) && buf) {
3915                                 c_size = kobj_read_blks(file, buf, c_size,
3916                                     page_addr);
3917                                 if (c_size < 0) {
3918                                         count = -1;
3919                                         break;
3920                                 }
3921                                 count += c_size;
3922                                 if (c_size != F_BLKS(file, size))
3923                                         break;
3924                                 size -= c_size;
3925                                 off += c_size;
3926                                 buf += c_size;
3927                         /*
3928                          * Otherwise, read into our buffer and copy next time
3929                          * around the loop.
3930                          */
3931                         } else {
3932                                 file->_off = page_addr;
3933                                 c_size = kobj_read_blks(file, file->_base,
3934                                     file->_bsize, page_addr);
3935                                 file->_ptr = file->_base;
3936                                 file->_cnt = c_size;
3937                                 file->_size = c_size;
3938                                 /*
3939                                  * If a _filbuf call or nothing read, break.
3940                                  */
3941                                 if (buf == NULL || c_size <= 0) {
3942                                         count = c_size;
3943                                         break;
3944                                 }
3945                         }
3946                         if (_moddebug & MODDEBUG_ERRMSG)
3947                                 _kobj_printf(ops, "read %x bytes\n", c_size);
3948                 }
3949         }
3950         if (_moddebug & MODDEBUG_ERRMSG)
3951                 _kobj_printf(ops, "count = %x\n", count);
3952 
3953         return (count);
3954 }
3955 
3956 static int
3957 kobj_read_blks(struct _buf *file, char *buf, uint_t size, uint_t off)
3958 {
3959         int ret;
3960 
3961         ASSERT(B_OFFSET(file, size) == 0 && B_OFFSET(file, off) == 0);
3962         if (file->_iscmp) {
3963                 uint_t blks;
3964                 int nret;
3965 
3966                 ret = 0;
3967                 for (blks = size / file->_bsize; blks != 0; blks--) {
3968                         nret = kobj_uncomp_blk(file, buf, off);
3969                         if (nret == -1)
3970                                 return (-1);
3971                         buf += nret;
3972                         off += nret;
3973                         ret += nret;
3974                         if (nret < file->_bsize)
3975                                 break;
3976                 }
3977         } else
3978                 ret = kobj_read(file->_fd, buf, size, off);
3979         return (ret);
3980 }
3981 
3982 static int
3983 kobj_uncomp_blk(struct _buf *file, char *buf, uint_t off)
3984 {
3985         struct comphdr *hdr = kobj_comphdr(file);
3986         ulong_t dlen, slen;
3987         caddr_t src;
3988         int i;
3989 
3990         dlen = file->_bsize;
3991         i = off / file->_bsize;
3992         src = file->_dbuf + hdr->ch_blkmap[i];
3993         if (i == hdr->ch_fsize / file->_bsize)
3994                 slen = file->_dsize - hdr->ch_blkmap[i];
3995         else
3996                 slen = hdr->ch_blkmap[i + 1] - hdr->ch_blkmap[i];
3997         if (z_uncompress(buf, &dlen, src, slen) != Z_OK)
3998                 return (-1);
3999         return (dlen);
4000 }
4001 
4002 int
4003 kobj_filbuf(struct _buf *f)
4004 {
4005         if (kobj_read_file(f, NULL, f->_bsize, f->_off + f->_size) > 0)
4006                 return (kobj_getc(f));
4007         return (-1);
4008 }
4009 
4010 void
4011 kobj_free(void *address, size_t size)
4012 {
4013         if (standalone)
4014                 return;
4015 
4016         kmem_free(address, size);
4017         kobj_stat.nfree_calls++;
4018         kobj_stat.nfree += size;
4019 }
4020 
4021 void *
4022 kobj_zalloc(size_t size, int flag)
4023 {
4024         void *v;
4025 
4026         if ((v = kobj_alloc(size, flag)) != 0) {
4027                 bzero(v, size);
4028         }
4029 
4030         return (v);
4031 }
4032 
4033 void *
4034 kobj_alloc(size_t size, int flag)
4035 {
4036         /*
4037          * If we are running standalone in the
4038          * linker, we ask boot for memory.
4039          * Either it's temporary memory that we lose
4040          * once boot is mapped out or we allocate it
4041          * permanently using the dynamic data segment.
4042          */
4043         if (standalone) {
4044 #if defined(_OBP)
4045                 if (flag & (KM_TMP | KM_SCRATCH))
4046                         return (bop_temp_alloc(size, MINALIGN));
4047 #else
4048                 if (flag & (KM_TMP | KM_SCRATCH))
4049                         return (BOP_ALLOC(ops, 0, size, MINALIGN));
4050 #endif
4051                 return (kobj_segbrk(&_edata, size, MINALIGN, 0));
4052         }
4053 
4054         kobj_stat.nalloc_calls++;
4055         kobj_stat.nalloc += size;
4056 
4057         return (kmem_alloc(size, (flag & KM_NOWAIT) ? KM_NOSLEEP : KM_SLEEP));
4058 }
4059 
4060 /*
4061  * Allow the "mod" system to sync up with the work
4062  * already done by kobj during the initial loading
4063  * of the kernel.  This also gives us a chance
4064  * to reallocate memory that belongs to boot.
4065  */
4066 void
4067 kobj_sync(void)
4068 {
4069         struct modctl_list *lp, **lpp;
4070 
4071         /*
4072          * The module path can be set in /etc/system via 'moddir' commands
4073          */
4074         if (default_path != NULL)
4075                 kobj_module_path = default_path;
4076         else
4077                 default_path = kobj_module_path;
4078 
4079         ksyms_arena = vmem_create("ksyms", NULL, 0, sizeof (uint64_t),
4080             segkmem_alloc, segkmem_free, heap_arena, 0, VM_SLEEP);
4081 
4082         ctf_arena = vmem_create("ctf", NULL, 0, sizeof (uint_t),
4083             segkmem_alloc, segkmem_free, heap_arena, 0, VM_SLEEP);
4084 
4085         /*
4086          * Move symbol tables from boot memory to ksyms_arena.
4087          */
4088         for (lpp = kobj_linkmaps; *lpp != NULL; lpp++) {
4089                 for (lp = *lpp; lp != NULL; lp = lp->modl_next)
4090                         kobj_export_module(mod(lp));
4091         }
4092 }
4093 
4094 caddr_t
4095 kobj_segbrk(caddr_t *spp, size_t size, size_t align, caddr_t limit)
4096 {
4097         uintptr_t va, pva;
4098         size_t alloc_pgsz = kobj_mmu_pagesize;
4099         size_t alloc_align = BO_NO_ALIGN;
4100         size_t alloc_size;
4101 
4102         /*
4103          * If we are using "large" mappings for the kernel,
4104          * request aligned memory from boot using the
4105          * "large" pagesize.
4106          */
4107         if (lg_pagesize) {
4108                 alloc_align = lg_pagesize;
4109                 alloc_pgsz = lg_pagesize;
4110         }
4111 
4112 #if defined(__sparc)
4113         /* account for redzone */
4114         if (limit)
4115                 limit -= alloc_pgsz;
4116 #endif  /* __sparc */
4117 
4118         va = ALIGN((uintptr_t)*spp, align);
4119         pva = P2ROUNDUP((uintptr_t)*spp, alloc_pgsz);
4120         /*
4121          * Need more pages?
4122          */
4123         if (va + size > pva) {
4124                 uintptr_t npva;
4125 
4126                 alloc_size = P2ROUNDUP(size - (pva - va), alloc_pgsz);
4127                 /*
4128                  * Check for overlapping segments.
4129                  */
4130                 if (limit && limit <= *spp + alloc_size) {
4131                         return ((caddr_t)0);
4132                 }
4133 
4134                 npva = (uintptr_t)BOP_ALLOC(ops, (caddr_t)pva,
4135                     alloc_size, alloc_align);
4136 
4137                 if (npva == 0) {
4138                         _kobj_printf(ops, "BOP_ALLOC failed, 0x%lx bytes",
4139                             alloc_size);
4140                         _kobj_printf(ops, " aligned %lx", alloc_align);
4141                         _kobj_printf(ops, " at 0x%lx\n", pva);
4142                         return (NULL);
4143                 }
4144         }
4145         *spp = (caddr_t)(va + size);
4146 
4147         return ((caddr_t)va);
4148 }
4149 
4150 /*
4151  * Calculate the number of output hash buckets.
4152  * We use the next prime larger than n / 4,
4153  * so the average hash chain is about 4 entries.
4154  * More buckets would just be a waste of memory.
4155  */
4156 uint_t
4157 kobj_gethashsize(uint_t n)
4158 {
4159         int f;
4160         int hsize = MAX(n / 4, 2);
4161 
4162         for (f = 2; f * f <= hsize; f++)
4163                 if (hsize % f == 0)
4164                         hsize += f = 1;
4165 
4166         return (hsize);
4167 }
4168 
4169 /*
4170  * Get the file size.
4171  *
4172  * Before root is mounted, files are compressed in the boot_archive ramdisk
4173  * (in the memory). kobj_fstat would return the compressed file size.
4174  * In order to get the uncompressed file size, read the file to the end and
4175  * count its size.
4176  */
4177 int
4178 kobj_get_filesize(struct _buf *file, uint64_t *size)
4179 {
4180         int err = 0;
4181         ssize_t resid;
4182         uint32_t buf;
4183 
4184         if (_modrootloaded) {
4185                 struct bootstat bst;
4186 
4187                 if (kobj_fstat(file->_fd, &bst) != 0)
4188                         return (EIO);
4189                 *size = bst.st_size;
4190 
4191                 if (file->_iscmp == CH_MAGIC_GZIP) {
4192                         /*
4193                          * Read the last 4 bytes of the compressed (gzip)
4194                          * image to get the size of its uncompressed
4195                          * version.
4196                          */
4197                         if ((err = vn_rdwr(UIO_READ, (struct vnode *)file->_fd,
4198                             (char *)(&buf), 4, (offset_t)(*size - 4),
4199                             UIO_SYSSPACE, 0, (rlim64_t)0, CRED(), &resid))
4200                             != 0) {
4201                                 _kobj_printf(ops, "kobj_get_filesize: "
4202                                     "vn_rdwr() failed with error 0x%x\n", err);
4203                                 return (-1);
4204                         }
4205 
4206                         *size =  (uint64_t)buf;
4207                 }
4208         } else {
4209 
4210 #if defined(_OBP)
4211                 struct bootstat bsb;
4212 
4213                 if (file->_iscmp) {
4214                         struct comphdr *hdr = kobj_comphdr(file);
4215 
4216                         *size = hdr->ch_fsize;
4217                 } else if (kobj_boot_fstat(file->_fd, &bsb) != 0)
4218                         return (EIO);
4219                 else
4220                         *size = bsb.st_size;
4221 #else
4222                 char *buf;
4223                 int count;
4224                 uint64_t offset = 0;
4225 
4226                 buf = kmem_alloc(MAXBSIZE, KM_SLEEP);
4227                 do {
4228                         count = kobj_read_file(file, buf, MAXBSIZE, offset);
4229                         if (count < 0) {
4230                                 kmem_free(buf, MAXBSIZE);
4231                                 return (EIO);
4232                         }
4233                         offset += count;
4234                 } while (count == MAXBSIZE);
4235                 kmem_free(buf, MAXBSIZE);
4236 
4237                 *size = offset;
4238 #endif
4239         }
4240 
4241         return (0);
4242 }
4243 
4244 static char *
4245 basename(char *s)
4246 {
4247         char *p, *q;
4248 
4249         q = NULL;
4250         p = s;
4251         do {
4252                 if (*p == '/')
4253                         q = p;
4254         } while (*p++);
4255         return (q ? q + 1 : s);
4256 }
4257 
4258 void
4259 kobj_stat_get(kobj_stat_t *kp)
4260 {
4261         *kp = kobj_stat;
4262 }
4263 
4264 int
4265 kobj_getpagesize()
4266 {
4267         return (lg_pagesize);
4268 }
4269 
4270 void
4271 kobj_textwin_alloc(struct module *mp)
4272 {
4273         ASSERT(MUTEX_HELD(&mod_lock));
4274 
4275         if (mp->textwin != NULL)
4276                 return;
4277 
4278         /*
4279          * If the text is not contained in the heap, then it is not contained
4280          * by a writable mapping.  (Specifically, it's on the nucleus page.)
4281          * We allocate a read/write mapping for this module's text to allow
4282          * the text to be patched without calling hot_patch_kernel_text()
4283          * (which is quite slow).
4284          */
4285         if (!vmem_contains(heaptext_arena, mp->text, mp->text_size)) {
4286                 uintptr_t text = (uintptr_t)mp->text;
4287                 uintptr_t size = (uintptr_t)mp->text_size;
4288                 uintptr_t i;
4289                 caddr_t va;
4290                 size_t sz = ((text + size + PAGESIZE - 1) & PAGEMASK) -
4291                     (text & PAGEMASK);
4292 
4293                 va = mp->textwin_base = vmem_alloc(heap_arena, sz, VM_SLEEP);
4294 
4295                 for (i = text & PAGEMASK; i < text + size; i += PAGESIZE) {
4296                         hat_devload(kas.a_hat, va, PAGESIZE,
4297                             hat_getpfnum(kas.a_hat, (caddr_t)i),
4298                             PROT_READ | PROT_WRITE,
4299                             HAT_LOAD_LOCK | HAT_LOAD_NOCONSIST);
4300                         va += PAGESIZE;
4301                 }
4302 
4303                 mp->textwin = mp->textwin_base + (text & PAGEOFFSET);
4304         } else {
4305                 mp->textwin = mp->text;
4306         }
4307 }
4308 
4309 void
4310 kobj_textwin_free(struct module *mp)
4311 {
4312         uintptr_t text = (uintptr_t)mp->text;
4313         uintptr_t tsize = (uintptr_t)mp->text_size;
4314         size_t size = (((text + tsize + PAGESIZE - 1) & PAGEMASK) -
4315             (text & PAGEMASK));
4316 
4317         mp->textwin = NULL;
4318 
4319         if (mp->textwin_base == NULL)
4320                 return;
4321 
4322         hat_unload(kas.a_hat, mp->textwin_base, size, HAT_UNLOAD_UNLOCK);
4323         vmem_free(heap_arena, mp->textwin_base, size);
4324         mp->textwin_base = NULL;
4325 }
4326 
4327 static char *
4328 find_libmacro(char *name)
4329 {
4330         int lmi;
4331 
4332         for (lmi = 0; lmi < NLIBMACROS; lmi++) {
4333                 if (strcmp(name, libmacros[lmi].lmi_macroname) == 0)
4334                         return (libmacros[lmi].lmi_list);
4335         }
4336         return (NULL);
4337 }
4338 
4339 /*
4340  * Check for $MACRO in tail (string to expand) and expand it in path at pathend
4341  * returns path if successful, else NULL
4342  * Support multiple $MACROs expansion and the first valid path will be returned
4343  * Caller's responsibility to provide enough space in path to expand
4344  */
4345 char *
4346 expand_libmacro(char *tail, char *path, char *pathend)
4347 {
4348         char c, *p, *p1, *p2, *path2, *endp;
4349         int diff, lmi, macrolen, valid_macro, more_macro;
4350         struct _buf *file;
4351 
4352         /*
4353          * check for $MACROS between nulls or slashes
4354          */
4355         p = strchr(tail, '$');
4356         if (p == NULL)
4357                 return (NULL);
4358         for (lmi = 0; lmi < NLIBMACROS; lmi++) {
4359                 macrolen = libmacros[lmi].lmi_macrolen;
4360                 if (strncmp(p + 1, libmacros[lmi].lmi_macroname, macrolen) == 0)
4361                         break;
4362         }
4363 
4364         valid_macro = 0;
4365         if (lmi < NLIBMACROS) {
4366                 /*
4367                  * The following checks are used to restrict expansion of
4368                  * macros to those that form a full directory/file name
4369                  * and to keep the behavior same as before.  If this
4370                  * restriction is removed or no longer valid in the future,
4371                  * the checks below can be deleted.
4372                  */
4373                 if ((p == tail) || (*(p - 1) == '/')) {
4374                         c = *(p + macrolen + 1);
4375                         if (c == '/' || c == '\0')
4376                                 valid_macro = 1;
4377                 }
4378         }
4379 
4380         if (!valid_macro) {
4381                 p2 = strchr(p, '/');
4382                 /*
4383                  * if no more macro to expand, then just copy whatever left
4384                  * and check whether it exists
4385                  */
4386                 if (p2 == NULL || strchr(p2, '$') == NULL) {
4387                         (void) strcpy(pathend, tail);
4388                         if ((file = kobj_open_path(path, 1, 1)) !=
4389                             (struct _buf *)-1) {
4390                                 kobj_close_file(file);
4391                                 return (path);
4392                         } else
4393                                 return (NULL);
4394                 } else {
4395                         /*
4396                          * copy all chars before '/' and call expand_libmacro()
4397                          * again
4398                          */
4399                         diff = p2 - tail;
4400                         bcopy(tail, pathend, diff);
4401                         pathend += diff;
4402                         *(pathend) = '\0';
4403                         return (expand_libmacro(p2, path, pathend));
4404                 }
4405         }
4406 
4407         more_macro = 0;
4408         if (c != '\0') {
4409                 endp = p + macrolen + 1;
4410                 if (strchr(endp, '$') != NULL)
4411                         more_macro = 1;
4412         } else
4413                 endp = NULL;
4414 
4415         /*
4416          * copy lmi_list and split it into components.
4417          * then put the part of tail before $MACRO into path
4418          * at pathend
4419          */
4420         diff = p - tail;
4421         if (diff > 0)
4422                 bcopy(tail, pathend, diff);
4423         path2 = pathend + diff;
4424         p1 = libmacros[lmi].lmi_list;
4425         while (p1 && (*p1 != '\0')) {
4426                 p2 = strchr(p1, ':');
4427                 if (p2) {
4428                         diff = p2 - p1;
4429                         bcopy(p1, path2, diff);
4430                         *(path2 + diff) = '\0';
4431                 } else {
4432                         diff = strlen(p1);
4433                         bcopy(p1, path2, diff + 1);
4434                 }
4435                 /* copy endp only if there isn't any more macro to expand */
4436                 if (!more_macro && (endp != NULL))
4437                         (void) strcat(path2, endp);
4438                 file = kobj_open_path(path, 1, 1);
4439                 if (file != (struct _buf *)-1) {
4440                         kobj_close_file(file);
4441                         /*
4442                          * if more macros to expand then call expand_libmacro(),
4443                          * else return path which has the whole path
4444                          */
4445                         if (!more_macro || (expand_libmacro(endp, path,
4446                             path2 + diff) != NULL)) {
4447                                 return (path);
4448                         }
4449                 }
4450                 if (p2)
4451                         p1 = ++p2;
4452                 else
4453                         return (NULL);
4454         }
4455         return (NULL);
4456 }
4457 
4458 static void
4459 tnf_add_notifyunload(kobj_notify_f *fp)
4460 {
4461         kobj_notify_list_t *entry;
4462 
4463         entry = kobj_alloc(sizeof (kobj_notify_list_t), KM_WAIT);
4464         entry->kn_type = KOBJ_NOTIFY_MODUNLOADING;
4465         entry->kn_func = fp;
4466         (void) kobj_notify_add(entry);
4467 }
4468 
4469 /* ARGSUSED */
4470 static void
4471 tnf_unsplice_probes(uint_t what, struct modctl *mod)
4472 {
4473         tnf_probe_control_t **p;
4474         tnf_tag_data_t **q;
4475         struct module *mp = mod->mod_mp;
4476 
4477         if (!(mp->flags & KOBJ_TNF_PROBE))
4478                 return;
4479 
4480         for (p = &__tnf_probe_list_head; *p; )
4481                 if (kobj_addrcheck(mp, (char *)*p) == 0)
4482                         *p = (*p)->next;
4483                 else
4484                         p = &(*p)->next;
4485 
4486         for (q = &__tnf_tag_list_head; *q; )
4487                 if (kobj_addrcheck(mp, (char *)*q) == 0)
4488                         *q = (tnf_tag_data_t *)(*q)->tag_version;
4489                 else
4490                         q = (tnf_tag_data_t **)&(*q)->tag_version;
4491 
4492         tnf_changed_probe_list = 1;
4493 }
4494 
4495 int
4496 tnf_splice_probes(int boot_load, tnf_probe_control_t *plist,
4497     tnf_tag_data_t *tlist)
4498 {
4499         int result = 0;
4500         static int add_notify = 1;
4501 
4502         if (plist) {
4503                 tnf_probe_control_t *pl;
4504 
4505                 for (pl = plist; pl->next; )
4506                         pl = pl->next;
4507 
4508                 if (!boot_load)
4509                         mutex_enter(&mod_lock);
4510                 tnf_changed_probe_list = 1;
4511                 pl->next = __tnf_probe_list_head;
4512                 __tnf_probe_list_head = plist;
4513                 if (!boot_load)
4514                         mutex_exit(&mod_lock);
4515                 result = 1;
4516         }
4517 
4518         if (tlist) {
4519                 tnf_tag_data_t *tl;
4520 
4521                 for (tl = tlist; tl->tag_version; )
4522                         tl = (tnf_tag_data_t *)tl->tag_version;
4523 
4524                 if (!boot_load)
4525                         mutex_enter(&mod_lock);
4526                 tl->tag_version = (tnf_tag_version_t *)__tnf_tag_list_head;
4527                 __tnf_tag_list_head = tlist;
4528                 if (!boot_load)
4529                         mutex_exit(&mod_lock);
4530                 result = 1;
4531         }
4532         if (!boot_load && result && add_notify) {
4533                 tnf_add_notifyunload(tnf_unsplice_probes);
4534                 add_notify = 0;
4535         }
4536         return (result);
4537 }
4538 
4539 char *kobj_file_buf;
4540 int kobj_file_bufsize;
4541 
4542 /*
4543  * This code is for the purpose of manually recording which files
4544  * needs to go into the boot archive on any given system.
4545  *
4546  * To enable the code, set kobj_file_bufsize in /etc/system
4547  * and reboot the system, then use mdb to look at kobj_file_buf.
4548  */
4549 static void
4550 kobj_record_file(char *filename)
4551 {
4552         static char *buf;
4553         static int size = 0;
4554         int n;
4555 
4556         if (kobj_file_bufsize == 0)     /* don't bother */
4557                 return;
4558 
4559         if (kobj_file_buf == NULL) {    /* allocate buffer */
4560                 size = kobj_file_bufsize;
4561                 buf = kobj_file_buf = kobj_alloc(size, KM_WAIT|KM_TMP);
4562         }
4563 
4564         n = snprintf(buf, size, "%s\n", filename);
4565         if (n > size)
4566                 n = size;
4567         size -= n;
4568         buf += n;
4569 }
4570 
4571 static int
4572 kobj_boot_fstat(int fd, struct bootstat *stp)
4573 {
4574 #if defined(_OBP)
4575         if (!standalone && _ioquiesced)
4576                 return (-1);
4577         return (BOP_FSTAT(ops, fd, stp));
4578 #else
4579         return (BRD_FSTAT(bfs_ops, fd, stp));
4580 #endif
4581 }
4582 
4583 static int
4584 kobj_boot_open(char *filename, int flags)
4585 {
4586 #if defined(_OBP)
4587 
4588         /*
4589          * If io via bootops is quiesced, it means boot is no longer
4590          * available to us.  We make it look as if we can't open the
4591          * named file - which is reasonably accurate.
4592          */
4593         if (!standalone && _ioquiesced)
4594                 return (-1);
4595 
4596         kobj_record_file(filename);
4597         return (BOP_OPEN(filename, flags));
4598 #else /* x86 */
4599         kobj_record_file(filename);
4600         return (BRD_OPEN(bfs_ops, filename, flags));
4601 #endif
4602 }
4603 
4604 static int
4605 kobj_boot_close(int fd)
4606 {
4607 #if defined(_OBP)
4608         if (!standalone && _ioquiesced)
4609                 return (-1);
4610 
4611         return (BOP_CLOSE(fd));
4612 #else /* x86 */
4613         return (BRD_CLOSE(bfs_ops, fd));
4614 #endif
4615 }
4616 
4617 /*ARGSUSED*/
4618 static int
4619 kobj_boot_seek(int fd, off_t hi, off_t lo)
4620 {
4621 #if defined(_OBP)
4622         return (BOP_SEEK(fd, lo) == -1 ? -1 : 0);
4623 #else
4624         return (BRD_SEEK(bfs_ops, fd, lo, SEEK_SET));
4625 #endif
4626 }
4627 
4628 static int
4629 kobj_boot_read(int fd, caddr_t buf, size_t size)
4630 {
4631 #if defined(_OBP)
4632         return (BOP_READ(fd, buf, size));
4633 #else
4634         return (BRD_READ(bfs_ops, fd, buf, size));
4635 #endif
4636 }
4637 
4638 static int
4639 kobj_boot_compinfo(int fd, struct compinfo *cb)
4640 {
4641         return (boot_compinfo(fd, cb));
4642 }
4643 
4644 /*
4645  * Check if the file is compressed (for now we handle only gzip).
4646  * It returns CH_MAGIC_GZIP if the file is compressed and 0 otherwise.
4647  */
4648 static int
4649 kobj_is_compressed(intptr_t fd)
4650 {
4651         struct vnode *vp = (struct vnode *)fd;
4652         ssize_t resid;
4653         uint16_t magic_buf;
4654         int err = 0;
4655 
4656         if ((err = vn_rdwr(UIO_READ, vp, (caddr_t)((intptr_t)&magic_buf),
4657             sizeof (magic_buf), (offset_t)(0),
4658             UIO_SYSSPACE, 0, (rlim64_t)0, CRED(), &resid)) != 0) {
4659 
4660                 _kobj_printf(ops, "kobj_is_compressed: vn_rdwr() failed, "
4661                     "error code 0x%x\n", err);
4662                 return (0);
4663         }
4664 
4665         if (magic_buf == CH_MAGIC_GZIP)
4666                 return (CH_MAGIC_GZIP);
4667 
4668         return (0);
4669 }