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 (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.
23 */
24
25 /*
26 * Copyright (c) 2013, Joyent, Inc. All rights reserved.
27 */
28
29 /*
30 * Libkvm Kernel Target
31 *
32 * The libkvm kernel target provides access to both crash dumps and live
33 * kernels through /dev/ksyms and /dev/kmem, using the facilities provided by
34 * the libkvm.so library. The target-specific data structures are shared
35 * between this file (common code) and the ISA-dependent parts of the target,
36 * and so they are defined in the mdb_kvm.h header. The target processes an
37 * "executable" (/dev/ksyms or the unix.X file) which contains a primary
38 * .symtab and .dynsym, and then also iterates over the krtld module chain in
39 * the kernel in order to obtain a list of loaded modules and per-module symbol
40 * tables. To improve startup performance, the per-module symbol tables are
41 * instantiated on-the-fly whenever an address lookup falls within the text
42 * section of a given module. The target also relies on services from the
43 * mdb_ks (kernel support) module, which contains pieces of the implementation
44 * that must be compiled against the kernel implementation.
45 */
46
47 #include <sys/modctl.h>
48 #include <sys/kobj.h>
49 #include <sys/kobj_impl.h>
50 #include <sys/utsname.h>
51 #include <sys/panic.h>
52 #include <sys/dumphdr.h>
53 #include <sys/dumpadm.h>
54
55 #include <dlfcn.h>
56 #include <libctf.h>
57 #include <string.h>
58 #include <fcntl.h>
59 #include <errno.h>
60
61 #include <mdb/mdb_target_impl.h>
62 #include <mdb/mdb_err.h>
63 #include <mdb/mdb_debug.h>
64 #include <mdb/mdb_string.h>
65 #include <mdb/mdb_modapi.h>
66 #include <mdb/mdb_io_impl.h>
67 #include <mdb/mdb_ctf.h>
68 #include <mdb/mdb_kvm.h>
69 #include <mdb/mdb_module.h>
70 #include <mdb/mdb_kb.h>
71 #include <mdb/mdb.h>
72
73 #define KT_RELOC_BUF(buf, obase, nbase) \
74 ((uintptr_t)(buf) - (uintptr_t)(obase) + (uintptr_t)(nbase))
75
76 #define KT_BAD_BUF(buf, base, size) \
77 ((uintptr_t)(buf) < (uintptr_t)(base) || \
78 ((uintptr_t)(buf) >= (uintptr_t)(base) + (uintptr_t)(size)))
79
80 typedef struct kt_symarg {
81 mdb_tgt_sym_f *sym_cb; /* Caller's callback function */
82 void *sym_data; /* Callback function argument */
83 uint_t sym_type; /* Symbol type/binding filter */
84 mdb_syminfo_t sym_info; /* Symbol id and table id */
85 const char *sym_obj; /* Containing object */
86 } kt_symarg_t;
87
88 typedef struct kt_maparg {
89 mdb_tgt_t *map_target; /* Target used for mapping iter */
90 mdb_tgt_map_f *map_cb; /* Caller's callback function */
91 void *map_data; /* Callback function argument */
92 } kt_maparg_t;
93
94 static const char KT_MODULE[] = "mdb_ks";
95 static const char KT_CTFPARENT[] = "genunix";
96
97 static void
98 kt_load_module(kt_data_t *kt, mdb_tgt_t *t, kt_module_t *km)
99 {
100 km->km_data = mdb_alloc(km->km_datasz, UM_SLEEP);
101
102 (void) mdb_tgt_vread(t, km->km_data, km->km_datasz, km->km_symspace_va);
103
104 km->km_symbuf = (void *)
105 KT_RELOC_BUF(km->km_symtab_va, km->km_symspace_va, km->km_data);
106
107 km->km_strtab = (char *)
108 KT_RELOC_BUF(km->km_strtab_va, km->km_symspace_va, km->km_data);
109
110 km->km_symtab = mdb_gelf_symtab_create_raw(&kt->k_file->gf_ehdr,
111 &km->km_symtab_hdr, km->km_symbuf,
112 &km->km_strtab_hdr, km->km_strtab, MDB_TGT_SYMTAB);
113 }
114
115 static void
116 kt_load_modules(kt_data_t *kt, mdb_tgt_t *t)
117 {
118 char name[MAXNAMELEN];
119 uintptr_t addr, head;
120
121 struct module kmod;
122 struct modctl ctl;
123 Shdr symhdr, strhdr;
124 GElf_Sym sym;
125
126 kt_module_t *km;
127
128 if (mdb_tgt_lookup_by_name(t, MDB_TGT_OBJ_EXEC,
129 "modules", &sym, NULL) == -1) {
130 warn("failed to get 'modules' symbol");
131 return;
132 }
133
134 if (mdb_tgt_readsym(t, MDB_TGT_AS_VIRT, &ctl, sizeof (ctl),
135 MDB_TGT_OBJ_EXEC, "modules") != sizeof (ctl)) {
136 warn("failed to read 'modules' struct");
137 return;
138 }
139
140 addr = head = (uintptr_t)sym.st_value;
141
142 do {
143 if (addr == 0)
144 break; /* Avoid spurious NULL pointers in list */
145
146 if (mdb_tgt_vread(t, &ctl, sizeof (ctl), addr) == -1) {
147 warn("failed to read modctl at %p", (void *)addr);
148 return;
149 }
150
151 if (ctl.mod_mp == NULL)
152 continue; /* No associated krtld structure */
153
154 if (mdb_tgt_readstr(t, MDB_TGT_AS_VIRT, name, MAXNAMELEN,
155 (uintptr_t)ctl.mod_modname) <= 0) {
156 warn("failed to read module name at %p",
157 (void *)ctl.mod_modname);
158 continue;
159 }
160
161 mdb_dprintf(MDB_DBG_KMOD, "reading mod %s (%p)\n",
162 name, (void *)addr);
163
164 if (mdb_nv_lookup(&kt->k_modules, name) != NULL) {
165 warn("skipping duplicate module '%s', id=%d\n",
166 name, ctl.mod_id);
167 continue;
168 }
169
170 if (mdb_tgt_vread(t, &kmod, sizeof (kmod),
171 (uintptr_t)ctl.mod_mp) == -1) {
172 warn("failed to read module at %p\n",
173 (void *)ctl.mod_mp);
174 continue;
175 }
176
177 if (kmod.symspace == NULL || kmod.symhdr == NULL ||
178 kmod.strhdr == NULL) {
179 /*
180 * If no buffer for the symbols has been allocated,
181 * or the shdrs for .symtab and .strtab are missing,
182 * then we're out of luck.
183 */
184 continue;
185 }
186
187 if (mdb_tgt_vread(t, &symhdr, sizeof (Shdr),
188 (uintptr_t)kmod.symhdr) == -1) {
189 warn("failed to read .symtab header for '%s', id=%d",
190 name, ctl.mod_id);
191 continue;
192 }
193
194 if (mdb_tgt_vread(t, &strhdr, sizeof (Shdr),
195 (uintptr_t)kmod.strhdr) == -1) {
196 warn("failed to read .strtab header for '%s', id=%d",
197 name, ctl.mod_id);
198 continue;
199 }
200
201 /*
202 * Now get clever: f(*^ing krtld didn't used to bother updating
203 * its own kmod.symsize value. We know that prior to this bug
204 * being fixed, symspace was a contiguous buffer containing
205 * .symtab, .strtab, and the symbol hash table in that order.
206 * So if symsize is zero, recompute it as the size of .symtab
207 * plus the size of .strtab. We don't need to load the hash
208 * table anyway since we re-hash all the symbols internally.
209 */
210 if (kmod.symsize == 0)
211 kmod.symsize = symhdr.sh_size + strhdr.sh_size;
212
213 /*
214 * Similar logic can be used to make educated guesses
215 * at the values of kmod.symtbl and kmod.strings.
216 */
217 if (kmod.symtbl == NULL)
218 kmod.symtbl = kmod.symspace;
219 if (kmod.strings == NULL)
220 kmod.strings = kmod.symspace + symhdr.sh_size;
221
222 /*
223 * Make sure things seem reasonable before we proceed
224 * to actually read and decipher the symspace.
225 */
226 if (KT_BAD_BUF(kmod.symtbl, kmod.symspace, kmod.symsize) ||
227 KT_BAD_BUF(kmod.strings, kmod.symspace, kmod.symsize)) {
228 warn("skipping module '%s', id=%d (corrupt symspace)\n",
229 name, ctl.mod_id);
230 continue;
231 }
232
233 km = mdb_zalloc(sizeof (kt_module_t), UM_SLEEP);
234 km->km_name = strdup(name);
235
236 (void) mdb_nv_insert(&kt->k_modules, km->km_name, NULL,
237 (uintptr_t)km, MDB_NV_EXTNAME);
238
239 km->km_datasz = kmod.symsize;
240 km->km_symspace_va = (uintptr_t)kmod.symspace;
241 km->km_symtab_va = (uintptr_t)kmod.symtbl;
242 km->km_strtab_va = (uintptr_t)kmod.strings;
243 km->km_symtab_hdr = symhdr;
244 km->km_strtab_hdr = strhdr;
245 km->km_text_va = (uintptr_t)kmod.text;
246 km->km_text_size = kmod.text_size;
247 km->km_data_va = (uintptr_t)kmod.data;
248 km->km_data_size = kmod.data_size;
249 km->km_bss_va = (uintptr_t)kmod.bss;
250 km->km_bss_size = kmod.bss_size;
251
252 if (kt->k_ctfvalid) {
253 km->km_ctf_va = (uintptr_t)kmod.ctfdata;
254 km->km_ctf_size = kmod.ctfsize;
255 }
256
257 /*
258 * Add the module to the end of the list of modules in load-
259 * dependency order. This is needed to load the corresponding
260 * debugger modules in the same order for layering purposes.
261 */
262 mdb_list_append(&kt->k_modlist, km);
263
264 if (t->t_flags & MDB_TGT_F_PRELOAD) {
265 mdb_iob_printf(mdb.m_out, " %s", name);
266 mdb_iob_flush(mdb.m_out);
267 kt_load_module(kt, t, km);
268 }
269
270 } while ((addr = (uintptr_t)ctl.mod_next) != head);
271 }
272
273 int
274 kt_setflags(mdb_tgt_t *t, int flags)
275 {
276 int iochg = ((flags ^ t->t_flags) & MDB_TGT_F_ALLOWIO) &&
277 !mdb_prop_postmortem;
278 int rwchg = (flags ^ t->t_flags) & MDB_TGT_F_RDWR;
279 kt_data_t *kt = t->t_data;
280 const char *kvmfile;
281 void *cookie;
282 int mode;
283
284 if (!iochg && !rwchg)
285 return (0);
286
287 if (kt->k_xpv_domu) {
288 warn("read-only target");
289 return (-1);
290 }
291
292 if (iochg) {
293 kvmfile = (flags & MDB_TGT_F_ALLOWIO) ? "/dev/allkmem" :
294 "/dev/kmem";
295 } else {
296 kvmfile = kt->k_kvmfile;
297 }
298
299 mode = (flags & MDB_TGT_F_RDWR) ? O_RDWR : O_RDONLY;
300
301 if ((cookie = kt->k_kb_ops->kb_open(kt->k_symfile, kvmfile, NULL, mode,
302 mdb.m_pname)) == NULL) {
303 /* We failed to re-open, so don't change t_flags */
304 warn("failed to re-open target");
305 return (-1);
306 }
307
308 /*
309 * We successfully reopened the target, so update k_kvmfile. Also set
310 * the RDWR and ALLOWIO bits in t_flags to match those in flags.
311 */
312 (void) kt->k_kb_ops->kb_close(kt->k_cookie);
313 kt->k_cookie = cookie;
314
315 if (kvmfile != kt->k_kvmfile) {
316 strfree(kt->k_kvmfile);
317 kt->k_kvmfile = strdup(kvmfile);
318 }
319
320 t->t_flags = (t->t_flags & ~(MDB_TGT_F_RDWR | MDB_TGT_F_ALLOWIO)) |
321 (flags & (MDB_TGT_F_RDWR | MDB_TGT_F_ALLOWIO));
322
323 return (0);
324 }
325
326 /*
327 * Determine which PIDs (if any) have their pages saved in the dump. We
328 * do this by looking for content flags in dump_flags in the header. These
329 * flags, which won't be set in older dumps, tell us whether a single process
330 * has had its pages included in the dump. If a single process has been
331 * included, we need to get the PID for that process from the dump_pids
332 * array in the dump.
333 */
334 static int
335 kt_find_dump_contents(kt_data_t *kt)
336 {
337 dumphdr_t *dh = kt->k_dumphdr;
338 pid_t pid = -1;
339
340 if (dh->dump_flags & DF_ALL)
341 return (KT_DUMPCONTENT_ALL);
342
343 if (dh->dump_flags & DF_CURPROC) {
344 if ((pid = kt->k_dump_find_curproc()) == -1)
345 return (KT_DUMPCONTENT_INVALID);
346 else
347 return (pid);
348 } else {
349 return (KT_DUMPCONTENT_KERNEL);
350 }
351 }
352
353 static int
354 kt_dump_contains_proc(mdb_tgt_t *t, void *context)
355 {
356 kt_data_t *kt = t->t_data;
357 pid_t (*f_pid)(uintptr_t);
358 pid_t reqpid;
359
360 switch (kt->k_dumpcontent) {
361 case KT_DUMPCONTENT_KERNEL:
362 return (0);
363 case KT_DUMPCONTENT_ALL:
364 return (1);
365 case KT_DUMPCONTENT_INVALID:
366 goto procnotfound;
367 default:
368 f_pid = (pid_t (*)()) dlsym(RTLD_NEXT, "mdb_kproc_pid");
369 if (f_pid == NULL)
370 goto procnotfound;
371
372 reqpid = f_pid((uintptr_t)context);
373 if (reqpid == -1)
374 goto procnotfound;
375
376 return (kt->k_dumpcontent == reqpid);
377 }
378
379 procnotfound:
380 warn("unable to determine whether dump contains proc %p\n", context);
381 return (1);
382 }
383
384 int
385 kt_setcontext(mdb_tgt_t *t, void *context)
386 {
387 if (context != NULL) {
388 const char *argv[2];
389 int argc = 0;
390 mdb_tgt_t *ct;
391 kt_data_t *kt = t->t_data;
392
393 argv[argc++] = (const char *)context;
394 argv[argc] = NULL;
395
396 if (kt->k_dumphdr != NULL &&
397 !kt_dump_contains_proc(t, context)) {
398 warn("dump does not contain pages for proc %p\n",
399 context);
400 return (-1);
401 }
402
403 if ((ct = mdb_tgt_create(mdb_kproc_tgt_create,
404 t->t_flags, argc, argv)) == NULL)
405 return (-1);
406
407 mdb_printf("debugger context set to proc %p\n", context);
408 mdb_tgt_activate(ct);
409 } else
410 mdb_printf("debugger context set to kernel\n");
411
412 return (0);
413 }
414
415 static int
416 kt_stack(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
417 {
418 kt_data_t *kt = mdb.m_target->t_data;
419 return (kt->k_dcmd_stack(addr, flags, argc, argv));
420 }
421
422 static int
423 kt_stackv(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
424 {
425 kt_data_t *kt = mdb.m_target->t_data;
426 return (kt->k_dcmd_stackv(addr, flags, argc, argv));
427 }
428
429 static int
430 kt_stackr(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
431 {
432 kt_data_t *kt = mdb.m_target->t_data;
433 return (kt->k_dcmd_stackr(addr, flags, argc, argv));
434 }
435
436 static int
437 kt_regs(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
438 {
439 kt_data_t *kt = mdb.m_target->t_data;
440
441 if (argc != 0 || (flags & DCMD_ADDRSPEC))
442 return (DCMD_USAGE);
443
444 addr = (uintptr_t)kt->k_regs;
445
446 return (kt->k_dcmd_regs(addr, flags, argc, argv));
447 }
448
449 #ifdef __x86
450 static int
451 kt_cpustack(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
452 {
453 kt_data_t *kt = mdb.m_target->t_data;
454 return (kt->k_dcmd_cpustack(addr, flags, argc, argv));
455 }
456
457 static int
458 kt_cpuregs(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
459 {
460 kt_data_t *kt = mdb.m_target->t_data;
461 return (kt->k_dcmd_cpuregs(addr, flags, argc, argv));
462 }
463 #endif /* __x86 */
464
465 /*ARGSUSED*/
466 static int
467 kt_status_dcmd(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
468 {
469 kt_data_t *kt = mdb.m_target->t_data;
470 struct utsname uts;
471
472 bzero(&uts, sizeof (uts));
473 (void) strcpy(uts.nodename, "unknown machine");
474 (void) kt_uname(mdb.m_target, &uts);
475
476 if (mdb_prop_postmortem) {
477 mdb_printf("debugging %scrash dump %s (%d-bit) from %s\n",
478 kt->k_xpv_domu ? "domain " : "", kt->k_kvmfile,
479 (int)(sizeof (void *) * NBBY), uts.nodename);
480 } else {
481 mdb_printf("debugging live kernel (%d-bit) on %s\n",
482 (int)(sizeof (void *) * NBBY), uts.nodename);
483 }
484
485 mdb_printf("operating system: %s %s (%s)\n",
486 uts.release, uts.version, uts.machine);
487
488 if (kt->k_dumphdr) {
489 dumphdr_t *dh = kt->k_dumphdr;
490
491 mdb_printf("image uuid: %s\n", dh->dump_uuid[0] != '\0' ?
492 dh->dump_uuid : "(not set)");
493 mdb_printf("panic message: %s\n", dh->dump_panicstring);
494
495 kt->k_dump_print_content(dh, kt->k_dumpcontent);
496 } else {
497 char uuid[37];
498
499 if (mdb_readsym(uuid, 37, "dump_osimage_uuid") == 37 &&
500 uuid[36] == '\0') {
501 mdb_printf("image uuid: %s\n", uuid);
502 }
503 }
504
505 return (DCMD_OK);
506 }
507
508 static const mdb_dcmd_t kt_dcmds[] = {
509 { "$c", "?[cnt]", "print stack backtrace", kt_stack },
510 { "$C", "?[cnt]", "print stack backtrace", kt_stackv },
511 { "$r", NULL, "print general-purpose registers", kt_regs },
512 { "$?", NULL, "print status and registers", kt_regs },
513 { "regs", NULL, "print general-purpose registers", kt_regs },
514 { "stack", "?[cnt]", "print stack backtrace", kt_stack },
515 { "stackregs", "?", "print stack backtrace and registers", kt_stackr },
516 #ifdef __x86
517 { "cpustack", "?[-v] [-c cpuid] [cnt]", "print stack backtrace for a "
518 "specific CPU", kt_cpustack },
519 { "cpuregs", "?[-c cpuid]", "print general-purpose registers for a "
520 "specific CPU", kt_cpuregs },
521 #endif
522 { "status", NULL, "print summary of current target", kt_status_dcmd },
523 { NULL }
524 };
525
526 static uintmax_t
527 reg_disc_get(const mdb_var_t *v)
528 {
529 mdb_tgt_t *t = MDB_NV_COOKIE(v);
530 kt_data_t *kt = t->t_data;
531 mdb_tgt_reg_t r = 0;
532
533 (void) mdb_tgt_getareg(t, kt->k_tid, mdb_nv_get_name(v), &r);
534 return (r);
535 }
536
537 static kt_module_t *
538 kt_module_by_name(kt_data_t *kt, const char *name)
539 {
540 kt_module_t *km;
541
542 for (km = mdb_list_next(&kt->k_modlist); km; km = mdb_list_next(km)) {
543 if (strcmp(name, km->km_name) == 0)
544 return (km);
545 }
546
547 return (NULL);
548 }
549
550 void
551 kt_activate(mdb_tgt_t *t)
552 {
553 static const mdb_nv_disc_t reg_disc = { NULL, reg_disc_get };
554 kt_data_t *kt = t->t_data;
555 void *sym;
556
557 int oflag;
558
559 mdb_prop_postmortem = kt->k_xpv_domu || (kt->k_dumphdr != NULL);
560 mdb_prop_kernel = TRUE;
561 mdb_prop_datamodel = MDB_TGT_MODEL_NATIVE;
562
563 if (kt->k_activated == FALSE) {
564 struct utsname u1, u2;
565 /*
566 * If we're examining a crash dump, root is /, and uname(2)
567 * does not match the utsname in the dump, issue a warning.
568 * Note that we are assuming that the modules and macros in
569 * /usr/lib are compiled against the kernel from uname -rv.
570 */
571 if (mdb_prop_postmortem && strcmp(mdb.m_root, "/") == 0 &&
572 uname(&u1) >= 0 && kt_uname(t, &u2) >= 0 &&
573 (strcmp(u1.release, u2.release) ||
574 strcmp(u1.version, u2.version))) {
575 mdb_warn("warning: dump is from %s %s %s; dcmds and "
576 "macros may not match kernel implementation\n",
577 u2.sysname, u2.release, u2.version);
578 }
579
580 if (mdb_module_load(KT_MODULE, MDB_MOD_GLOBAL) < 0) {
581 warn("failed to load kernel support module -- "
582 "some modules may not load\n");
583 }
584
585 if (mdb_prop_postmortem && kt->k_dumphdr != NULL) {
586 sym = dlsym(RTLD_NEXT, "mdb_dump_print_content");
587 if (sym != NULL)
588 kt->k_dump_print_content = (void (*)())sym;
589
590 sym = dlsym(RTLD_NEXT, "mdb_dump_find_curproc");
591 if (sym != NULL)
592 kt->k_dump_find_curproc = (int (*)())sym;
593
594 kt->k_dumpcontent = kt_find_dump_contents(kt);
595 }
596
597 if (t->t_flags & MDB_TGT_F_PRELOAD) {
598 oflag = mdb_iob_getflags(mdb.m_out) & MDB_IOB_PGENABLE;
599
600 mdb_iob_clrflags(mdb.m_out, oflag);
601 mdb_iob_puts(mdb.m_out, "Preloading module symbols: [");
602 mdb_iob_flush(mdb.m_out);
603 }
604
605 if (!(t->t_flags & MDB_TGT_F_NOLOAD)) {
606 kt_load_modules(kt, t);
607
608 /*
609 * Determine where the CTF data for krtld is. If krtld
610 * is rolled into unix, force load the MDB krtld
611 * module.
612 */
613 kt->k_rtld_name = "krtld";
614
615 if (kt_module_by_name(kt, "krtld") == NULL) {
616 (void) mdb_module_load("krtld", MDB_MOD_SILENT);
617 kt->k_rtld_name = "unix";
618 }
619 }
620
621
622 if (t->t_flags & MDB_TGT_F_PRELOAD) {
623 mdb_iob_puts(mdb.m_out, " ]\n");
624 mdb_iob_setflags(mdb.m_out, oflag);
625 }
626
627 kt->k_activated = TRUE;
628 }
629
630 (void) mdb_tgt_register_dcmds(t, &kt_dcmds[0], MDB_MOD_FORCE);
631
632 /* Export some of our registers as named variables */
633 mdb_tgt_register_regvars(t, kt->k_rds, ®_disc, MDB_NV_RDONLY);
634
635 mdb_tgt_elf_export(kt->k_file);
636 }
637
638 void
639 kt_deactivate(mdb_tgt_t *t)
640 {
641 kt_data_t *kt = t->t_data;
642
643 const mdb_tgt_regdesc_t *rdp;
644 const mdb_dcmd_t *dcp;
645
646 for (rdp = kt->k_rds; rdp->rd_name != NULL; rdp++) {
647 mdb_var_t *v;
648
649 if (!(rdp->rd_flags & MDB_TGT_R_EXPORT))
650 continue; /* Didn't export register as a variable */
651
652 if ((v = mdb_nv_lookup(&mdb.m_nv, rdp->rd_name)) != NULL) {
653 v->v_flags &= ~MDB_NV_PERSIST;
654 mdb_nv_remove(&mdb.m_nv, v);
655 }
656 }
657
658 for (dcp = &kt_dcmds[0]; dcp->dc_name != NULL; dcp++) {
659 if (mdb_module_remove_dcmd(t->t_module, dcp->dc_name) == -1)
660 warn("failed to remove dcmd %s", dcp->dc_name);
661 }
662
663 mdb_prop_postmortem = FALSE;
664 mdb_prop_kernel = FALSE;
665 mdb_prop_datamodel = MDB_TGT_MODEL_UNKNOWN;
666 }
667
668 /*ARGSUSED*/
669 const char *
670 kt_name(mdb_tgt_t *t)
671 {
672 return ("kvm");
673 }
674
675 const char *
676 kt_platform(mdb_tgt_t *t)
677 {
678 kt_data_t *kt = t->t_data;
679 return (kt->k_platform);
680 }
681
682 int
683 kt_uname(mdb_tgt_t *t, struct utsname *utsp)
684 {
685 return (mdb_tgt_readsym(t, MDB_TGT_AS_VIRT, utsp,
686 sizeof (struct utsname), MDB_TGT_OBJ_EXEC, "utsname"));
687 }
688
689 /*ARGSUSED*/
690 int
691 kt_dmodel(mdb_tgt_t *t)
692 {
693 return (MDB_TGT_MODEL_NATIVE);
694 }
695
696 ssize_t
697 kt_aread(mdb_tgt_t *t, mdb_tgt_as_t as, void *buf,
698 size_t nbytes, mdb_tgt_addr_t addr)
699 {
700 kt_data_t *kt = t->t_data;
701 ssize_t rval;
702
703 if ((rval = kt->k_kb_ops->kb_aread(kt->k_cookie, addr, buf,
704 nbytes, as)) == -1)
705 return (set_errno(EMDB_NOMAP));
706
707 return (rval);
708 }
709
710 ssize_t
711 kt_awrite(mdb_tgt_t *t, mdb_tgt_as_t as, const void *buf,
712 size_t nbytes, mdb_tgt_addr_t addr)
713 {
714 kt_data_t *kt = t->t_data;
715 ssize_t rval;
716
717 if ((rval = kt->k_kb_ops->kb_awrite(kt->k_cookie, addr, buf,
718 nbytes, as)) == -1)
719 return (set_errno(EMDB_NOMAP));
720
721 return (rval);
722 }
723
724 ssize_t
725 kt_vread(mdb_tgt_t *t, void *buf, size_t nbytes, uintptr_t addr)
726 {
727 kt_data_t *kt = t->t_data;
728 ssize_t rval;
729
730 if ((rval = kt->k_kb_ops->kb_kread(kt->k_cookie, addr, buf,
731 nbytes)) == -1)
732 return (set_errno(EMDB_NOMAP));
733
734 return (rval);
735 }
736
737 ssize_t
738 kt_vwrite(mdb_tgt_t *t, const void *buf, size_t nbytes, uintptr_t addr)
739 {
740 kt_data_t *kt = t->t_data;
741 ssize_t rval;
742
743 if ((rval = kt->k_kb_ops->kb_kwrite(kt->k_cookie, addr, buf,
744 nbytes)) == -1)
745 return (set_errno(EMDB_NOMAP));
746
747 return (rval);
748 }
749
750 ssize_t
751 kt_fread(mdb_tgt_t *t, void *buf, size_t nbytes, uintptr_t addr)
752 {
753 return (kt_vread(t, buf, nbytes, addr));
754 }
755
756 ssize_t
757 kt_fwrite(mdb_tgt_t *t, const void *buf, size_t nbytes, uintptr_t addr)
758 {
759 return (kt_vwrite(t, buf, nbytes, addr));
760 }
761
762 ssize_t
763 kt_pread(mdb_tgt_t *t, void *buf, size_t nbytes, physaddr_t addr)
764 {
765 kt_data_t *kt = t->t_data;
766 ssize_t rval;
767
768 if ((rval = kt->k_kb_ops->kb_pread(kt->k_cookie, addr, buf,
769 nbytes)) == -1)
770 return (set_errno(EMDB_NOMAP));
771
772 return (rval);
773 }
774
775 ssize_t
776 kt_pwrite(mdb_tgt_t *t, const void *buf, size_t nbytes, physaddr_t addr)
777 {
778 kt_data_t *kt = t->t_data;
779 ssize_t rval;
780
781 if ((rval = kt->k_kb_ops->kb_pwrite(kt->k_cookie, addr, buf,
782 nbytes)) == -1)
783 return (set_errno(EMDB_NOMAP));
784
785 return (rval);
786 }
787
788 int
789 kt_vtop(mdb_tgt_t *t, mdb_tgt_as_t as, uintptr_t va, physaddr_t *pap)
790 {
791 kt_data_t *kt = t->t_data;
792
793 struct as *asp;
794 physaddr_t pa;
795 mdb_module_t *mod;
796 mdb_var_t *v;
797 int (*fptr)(uintptr_t, struct as *, physaddr_t *);
798
799 switch ((uintptr_t)as) {
800 case (uintptr_t)MDB_TGT_AS_PHYS:
801 case (uintptr_t)MDB_TGT_AS_FILE:
802 case (uintptr_t)MDB_TGT_AS_IO:
803 return (set_errno(EINVAL));
804 case (uintptr_t)MDB_TGT_AS_VIRT:
805 asp = kt->k_as;
806 break;
807 default:
808 asp = (struct as *)as;
809 }
810
811 if ((pa = kt->k_kb_ops->kb_vtop(kt->k_cookie, asp, va)) != -1ULL) {
812 *pap = pa;
813 return (0);
814 }
815
816 if ((v = mdb_nv_lookup(&mdb.m_modules, "unix")) != NULL &&
817 (mod = mdb_nv_get_cookie(v)) != NULL) {
818
819 fptr = (int (*)(uintptr_t, struct as *, physaddr_t *))
820 dlsym(mod->mod_hdl, "platform_vtop");
821
822 if ((fptr != NULL) && ((*fptr)(va, asp, pap) == 0))
823 return (0);
824 }
825
826 return (set_errno(EMDB_NOMAP));
827 }
828
829 int
830 kt_lookup_by_name(mdb_tgt_t *t, const char *obj, const char *name,
831 GElf_Sym *symp, mdb_syminfo_t *sip)
832 {
833 kt_data_t *kt = t->t_data;
834 kt_module_t *km, kmod;
835 mdb_var_t *v;
836 int n;
837
838 /*
839 * To simplify the implementation, we create a fake module on the stack
840 * which is "prepended" to k_modlist and whose symtab is kt->k_symtab.
841 */
842 kmod.km_symtab = kt->k_symtab;
843 kmod.km_list.ml_next = mdb_list_next(&kt->k_modlist);
844
845 switch ((uintptr_t)obj) {
846 case (uintptr_t)MDB_TGT_OBJ_EXEC:
847 km = &kmod;
848 n = 1;
849 break;
850
851 case (uintptr_t)MDB_TGT_OBJ_EVERY:
852 km = &kmod;
853 n = mdb_nv_size(&kt->k_modules) + 1;
854 break;
855
856 case (uintptr_t)MDB_TGT_OBJ_RTLD:
857 obj = kt->k_rtld_name;
858 /*FALLTHRU*/
859
860 default:
861 if ((v = mdb_nv_lookup(&kt->k_modules, obj)) == NULL)
862 return (set_errno(EMDB_NOOBJ));
863
864 km = mdb_nv_get_cookie(v);
865 n = 1;
866
867 if (km->km_symtab == NULL)
868 kt_load_module(kt, t, km);
869 }
870
871 for (; n > 0; n--, km = mdb_list_next(km)) {
872 if (mdb_gelf_symtab_lookup_by_name(km->km_symtab, name,
873 symp, &sip->sym_id) == 0) {
874 sip->sym_table = MDB_TGT_SYMTAB;
875 return (0);
876 }
877 }
878
879 return (set_errno(EMDB_NOSYM));
880 }
881
882 int
883 kt_lookup_by_addr(mdb_tgt_t *t, uintptr_t addr, uint_t flags,
884 char *buf, size_t nbytes, GElf_Sym *symp, mdb_syminfo_t *sip)
885 {
886 kt_data_t *kt = t->t_data;
887 kt_module_t kmods[3], *kmods_begin = &kmods[0], *kmods_end;
888 const char *name;
889
890 kt_module_t *km = &kmods[0]; /* Point km at first fake module */
891 kt_module_t *sym_km = NULL; /* Module associated with best sym */
892 GElf_Sym sym; /* Best symbol found so far if !exact */
893 uint_t symid; /* ID of best symbol found so far */
894
895 /*
896 * To simplify the implementation, we create fake modules on the stack
897 * that are "prepended" to k_modlist and whose symtab is set to
898 * each of three special symbol tables, in order of precedence.
899 */
900 km->km_symtab = mdb.m_prsym;
901
902 if (kt->k_symtab != NULL) {
903 km->km_list.ml_next = (mdb_list_t *)(km + 1);
904 km = mdb_list_next(km);
905 km->km_symtab = kt->k_symtab;
906 }
907
908 if (kt->k_dynsym != NULL) {
909 km->km_list.ml_next = (mdb_list_t *)(km + 1);
910 km = mdb_list_next(km);
911 km->km_symtab = kt->k_dynsym;
912 }
913
914 km->km_list.ml_next = mdb_list_next(&kt->k_modlist);
915 kmods_end = km;
916
917 /*
918 * Now iterate over the list of fake and real modules. If the module
919 * has no symbol table and the address is in the text section,
920 * instantiate the module's symbol table. In exact mode, we can
921 * jump to 'found' immediately if we match. Otherwise we continue
922 * looking and improve our choice if we find a closer symbol.
923 */
924 for (km = &kmods[0]; km != NULL; km = mdb_list_next(km)) {
925 if (km->km_symtab == NULL && addr >= km->km_text_va &&
926 addr < km->km_text_va + km->km_text_size)
927 kt_load_module(kt, t, km);
928
929 if (mdb_gelf_symtab_lookup_by_addr(km->km_symtab, addr,
930 flags, buf, nbytes, symp, &sip->sym_id) != 0 ||
931 symp->st_value == 0)
932 continue;
933
934 if (flags & MDB_TGT_SYM_EXACT) {
935 sym_km = km;
936 goto found;
937 }
938
939 if (sym_km == NULL || mdb_gelf_sym_closer(symp, &sym, addr)) {
940 sym_km = km;
941 sym = *symp;
942 symid = sip->sym_id;
943 }
944 }
945
946 if (sym_km == NULL)
947 return (set_errno(EMDB_NOSYMADDR));
948
949 *symp = sym; /* Copy our best symbol into the caller's symbol */
950 sip->sym_id = symid;
951 found:
952 /*
953 * Once we've found something, copy the final name into the caller's
954 * buffer and prefix it with the load object name if appropriate.
955 */
956 if (sym_km != NULL) {
957 name = mdb_gelf_sym_name(sym_km->km_symtab, symp);
958
959 if (sym_km < kmods_begin || sym_km > kmods_end) {
960 (void) mdb_snprintf(buf, nbytes, "%s`%s",
961 sym_km->km_name, name);
962 } else if (nbytes > 0) {
963 (void) strncpy(buf, name, nbytes);
964 buf[nbytes - 1] = '\0';
965 }
966
967 if (sym_km->km_symtab == mdb.m_prsym)
968 sip->sym_table = MDB_TGT_PRVSYM;
969 else
970 sip->sym_table = MDB_TGT_SYMTAB;
971 } else {
972 sip->sym_table = MDB_TGT_SYMTAB;
973 }
974
975 return (0);
976 }
977
978 static int
979 kt_symtab_func(void *data, const GElf_Sym *sym, const char *name, uint_t id)
980 {
981 kt_symarg_t *argp = data;
982
983 if (mdb_tgt_sym_match(sym, argp->sym_type)) {
984 argp->sym_info.sym_id = id;
985
986 return (argp->sym_cb(argp->sym_data, sym, name,
987 &argp->sym_info, argp->sym_obj));
988 }
989
990 return (0);
991 }
992
993 static void
994 kt_symtab_iter(mdb_gelf_symtab_t *gst, uint_t type, const char *obj,
995 mdb_tgt_sym_f *cb, void *p)
996 {
997 kt_symarg_t arg;
998
999 arg.sym_cb = cb;
1000 arg.sym_data = p;
1001 arg.sym_type = type;
1002 arg.sym_info.sym_table = gst->gst_tabid;
1003 arg.sym_obj = obj;
1004
1005 mdb_gelf_symtab_iter(gst, kt_symtab_func, &arg);
1006 }
1007
1008 int
1009 kt_symbol_iter(mdb_tgt_t *t, const char *obj, uint_t which, uint_t type,
1010 mdb_tgt_sym_f *cb, void *data)
1011 {
1012 kt_data_t *kt = t->t_data;
1013 kt_module_t *km;
1014
1015 mdb_gelf_symtab_t *symtab = NULL;
1016 mdb_var_t *v;
1017
1018 switch ((uintptr_t)obj) {
1019 case (uintptr_t)MDB_TGT_OBJ_EXEC:
1020 if (which == MDB_TGT_SYMTAB)
1021 symtab = kt->k_symtab;
1022 else
1023 symtab = kt->k_dynsym;
1024 break;
1025
1026 case (uintptr_t)MDB_TGT_OBJ_EVERY:
1027 if (which == MDB_TGT_DYNSYM) {
1028 symtab = kt->k_dynsym;
1029 obj = MDB_TGT_OBJ_EXEC;
1030 break;
1031 }
1032
1033 mdb_nv_rewind(&kt->k_modules);
1034 while ((v = mdb_nv_advance(&kt->k_modules)) != NULL) {
1035 km = mdb_nv_get_cookie(v);
1036
1037 if (km->km_symtab == NULL)
1038 kt_load_module(kt, t, km);
1039
1040 if (km->km_symtab != NULL)
1041 kt_symtab_iter(km->km_symtab, type,
1042 km->km_name, cb, data);
1043 }
1044 break;
1045
1046 case (uintptr_t)MDB_TGT_OBJ_RTLD:
1047 obj = kt->k_rtld_name;
1048 /*FALLTHRU*/
1049
1050 default:
1051 v = mdb_nv_lookup(&kt->k_modules, obj);
1052
1053 if (v == NULL)
1054 return (set_errno(EMDB_NOOBJ));
1055
1056 km = mdb_nv_get_cookie(v);
1057
1058 if (km->km_symtab == NULL)
1059 kt_load_module(kt, t, km);
1060
1061 symtab = km->km_symtab;
1062 }
1063
1064 if (symtab)
1065 kt_symtab_iter(symtab, type, obj, cb, data);
1066
1067 return (0);
1068 }
1069
1070 static int
1071 kt_mapping_walk(uintptr_t addr, const void *data, kt_maparg_t *marg)
1072 {
1073 /*
1074 * This is a bit sketchy but avoids problematic compilation of this
1075 * target against the current VM implementation. Now that we have
1076 * vmem, we can make this less broken and more informative by changing
1077 * this code to invoke the vmem walker in the near future.
1078 */
1079 const struct kt_seg {
1080 caddr_t s_base;
1081 size_t s_size;
1082 } *segp = (const struct kt_seg *)data;
1083
1084 mdb_map_t map;
1085 GElf_Sym sym;
1086 mdb_syminfo_t info;
1087
1088 map.map_base = (uintptr_t)segp->s_base;
1089 map.map_size = segp->s_size;
1090 map.map_flags = MDB_TGT_MAP_R | MDB_TGT_MAP_W | MDB_TGT_MAP_X;
1091
1092 if (kt_lookup_by_addr(marg->map_target, addr, MDB_TGT_SYM_EXACT,
1093 map.map_name, MDB_TGT_MAPSZ, &sym, &info) == -1) {
1094
1095 (void) mdb_iob_snprintf(map.map_name, MDB_TGT_MAPSZ,
1096 "%lr", addr);
1097 }
1098
1099 return (marg->map_cb(marg->map_data, &map, map.map_name));
1100 }
1101
1102 int
1103 kt_mapping_iter(mdb_tgt_t *t, mdb_tgt_map_f *func, void *private)
1104 {
1105 kt_data_t *kt = t->t_data;
1106 kt_maparg_t m;
1107
1108 m.map_target = t;
1109 m.map_cb = func;
1110 m.map_data = private;
1111
1112 return (mdb_pwalk("seg", (mdb_walk_cb_t)kt_mapping_walk, &m,
1113 (uintptr_t)kt->k_as));
1114 }
1115
1116 static const mdb_map_t *
1117 kt_module_to_map(kt_module_t *km, mdb_map_t *map)
1118 {
1119 (void) strncpy(map->map_name, km->km_name, MDB_TGT_MAPSZ);
1120 map->map_name[MDB_TGT_MAPSZ - 1] = '\0';
1121 map->map_base = km->km_text_va;
1122 map->map_size = km->km_text_size;
1123 map->map_flags = MDB_TGT_MAP_R | MDB_TGT_MAP_W | MDB_TGT_MAP_X;
1124
1125 return (map);
1126 }
1127
1128 int
1129 kt_object_iter(mdb_tgt_t *t, mdb_tgt_map_f *func, void *private)
1130 {
1131 kt_data_t *kt = t->t_data;
1132 kt_module_t *km;
1133 mdb_map_t m;
1134
1135 for (km = mdb_list_next(&kt->k_modlist); km; km = mdb_list_next(km)) {
1136 if (func(private, kt_module_to_map(km, &m), km->km_name) == -1)
1137 break;
1138 }
1139
1140 return (0);
1141 }
1142
1143 const mdb_map_t *
1144 kt_addr_to_map(mdb_tgt_t *t, uintptr_t addr)
1145 {
1146 kt_data_t *kt = t->t_data;
1147 kt_module_t *km;
1148
1149 for (km = mdb_list_next(&kt->k_modlist); km; km = mdb_list_next(km)) {
1150 if (addr - km->km_text_va < km->km_text_size ||
1151 addr - km->km_data_va < km->km_data_size ||
1152 addr - km->km_bss_va < km->km_bss_size)
1153 return (kt_module_to_map(km, &kt->k_map));
1154 }
1155
1156 (void) set_errno(EMDB_NOMAP);
1157 return (NULL);
1158 }
1159
1160 const mdb_map_t *
1161 kt_name_to_map(mdb_tgt_t *t, const char *name)
1162 {
1163 kt_data_t *kt = t->t_data;
1164 kt_module_t *km;
1165 mdb_map_t m;
1166
1167 /*
1168 * If name is MDB_TGT_OBJ_EXEC, return the first module on the list,
1169 * which will be unix since we keep k_modlist in load order.
1170 */
1171 if (name == MDB_TGT_OBJ_EXEC)
1172 return (kt_module_to_map(mdb_list_next(&kt->k_modlist), &m));
1173
1174 if (name == MDB_TGT_OBJ_RTLD)
1175 name = kt->k_rtld_name;
1176
1177 if ((km = kt_module_by_name(kt, name)) != NULL)
1178 return (kt_module_to_map(km, &m));
1179
1180 (void) set_errno(EMDB_NOOBJ);
1181 return (NULL);
1182 }
1183
1184 static ctf_file_t *
1185 kt_load_ctfdata(mdb_tgt_t *t, kt_module_t *km)
1186 {
1187 kt_data_t *kt = t->t_data;
1188 int err;
1189
1190 if (km->km_ctfp != NULL)
1191 return (km->km_ctfp);
1192
1193 if (km->km_ctf_va == 0) {
1194 (void) set_errno(EMDB_NOCTF);
1195 return (NULL);
1196 }
1197
1198 if (km->km_symtab == NULL)
1199 kt_load_module(t->t_data, t, km);
1200
1201 if ((km->km_ctf_buf = mdb_alloc(km->km_ctf_size, UM_NOSLEEP)) == NULL) {
1202 warn("failed to allocate memory to load %s debugging "
1203 "information", km->km_name);
1204 return (NULL);
1205 }
1206
1207 if (mdb_tgt_vread(t, km->km_ctf_buf, km->km_ctf_size,
1208 km->km_ctf_va) != km->km_ctf_size) {
1209 warn("failed to read %lu bytes of debug data for %s at %p",
1210 (ulong_t)km->km_ctf_size, km->km_name,
1211 (void *)km->km_ctf_va);
1212 mdb_free(km->km_ctf_buf, km->km_ctf_size);
1213 km->km_ctf_buf = NULL;
1214 return (NULL);
1215 }
1216
1217 if ((km->km_ctfp = mdb_ctf_bufopen((const void *)km->km_ctf_buf,
1218 km->km_ctf_size, km->km_symbuf, &km->km_symtab_hdr,
1219 km->km_strtab, &km->km_strtab_hdr, &err)) == NULL) {
1220 mdb_free(km->km_ctf_buf, km->km_ctf_size);
1221 km->km_ctf_buf = NULL;
1222 (void) set_errno(ctf_to_errno(err));
1223 return (NULL);
1224 }
1225
1226 mdb_dprintf(MDB_DBG_KMOD, "loaded %lu bytes of CTF data for %s\n",
1227 (ulong_t)km->km_ctf_size, km->km_name);
1228
1229 if (ctf_parent_name(km->km_ctfp) != NULL) {
1230 mdb_var_t *v;
1231
1232 if ((v = mdb_nv_lookup(&kt->k_modules,
1233 ctf_parent_name(km->km_ctfp))) == NULL) {
1234 warn("failed to load CTF data for %s - parent %s not "
1235 "loaded\n", km->km_name,
1236 ctf_parent_name(km->km_ctfp));
1237 }
1238
1239 if (v != NULL) {
1240 kt_module_t *pm = mdb_nv_get_cookie(v);
1241
1242 if (pm->km_ctfp == NULL)
1243 (void) kt_load_ctfdata(t, pm);
1244
1245 if (pm->km_ctfp != NULL && ctf_import(km->km_ctfp,
1246 pm->km_ctfp) == CTF_ERR) {
1247 warn("failed to import parent types into "
1248 "%s: %s\n", km->km_name,
1249 ctf_errmsg(ctf_errno(km->km_ctfp)));
1250 }
1251 }
1252 }
1253
1254 return (km->km_ctfp);
1255 }
1256
1257 ctf_file_t *
1258 kt_addr_to_ctf(mdb_tgt_t *t, uintptr_t addr)
1259 {
1260 kt_data_t *kt = t->t_data;
1261 kt_module_t *km;
1262
1263 for (km = mdb_list_next(&kt->k_modlist); km; km = mdb_list_next(km)) {
1264 if (addr - km->km_text_va < km->km_text_size ||
1265 addr - km->km_data_va < km->km_data_size ||
1266 addr - km->km_bss_va < km->km_bss_size)
1267 return (kt_load_ctfdata(t, km));
1268 }
1269
1270 (void) set_errno(EMDB_NOMAP);
1271 return (NULL);
1272 }
1273
1274 ctf_file_t *
1275 kt_name_to_ctf(mdb_tgt_t *t, const char *name)
1276 {
1277 kt_data_t *kt = t->t_data;
1278 kt_module_t *km;
1279
1280 if (name == MDB_TGT_OBJ_EXEC)
1281 name = KT_CTFPARENT;
1282 else if (name == MDB_TGT_OBJ_RTLD)
1283 name = kt->k_rtld_name;
1284
1285 if ((km = kt_module_by_name(kt, name)) != NULL)
1286 return (kt_load_ctfdata(t, km));
1287
1288 (void) set_errno(EMDB_NOOBJ);
1289 return (NULL);
1290 }
1291
1292 /*ARGSUSED*/
1293 int
1294 kt_status(mdb_tgt_t *t, mdb_tgt_status_t *tsp)
1295 {
1296 kt_data_t *kt = t->t_data;
1297 bzero(tsp, sizeof (mdb_tgt_status_t));
1298 tsp->st_state = (kt->k_xpv_domu || (kt->k_dumphdr != NULL)) ?
1299 MDB_TGT_DEAD : MDB_TGT_RUNNING;
1300 return (0);
1301 }
1302
1303 static ssize_t
1304 kt_xd_dumphdr(mdb_tgt_t *t, void *buf, size_t nbytes)
1305 {
1306 kt_data_t *kt = t->t_data;
1307
1308 if (buf == NULL && nbytes == 0)
1309 return (sizeof (dumphdr_t));
1310
1311 if (kt->k_dumphdr == NULL)
1312 return (set_errno(ENODATA));
1313
1314 nbytes = MIN(nbytes, sizeof (dumphdr_t));
1315 bcopy(kt->k_dumphdr, buf, nbytes);
1316
1317 return (nbytes);
1318 }
1319
1320 void
1321 kt_destroy(mdb_tgt_t *t)
1322 {
1323 kt_data_t *kt = t->t_data;
1324 kt_module_t *km, *nkm;
1325
1326 (void) mdb_module_unload(KT_MODULE, 0);
1327
1328 if (kt->k_regs != NULL)
1329 mdb_free(kt->k_regs, kt->k_regsize);
1330
1331 if (kt->k_symtab != NULL)
1332 mdb_gelf_symtab_destroy(kt->k_symtab);
1333
1334 if (kt->k_dynsym != NULL)
1335 mdb_gelf_symtab_destroy(kt->k_dynsym);
1336
1337 if (kt->k_dumphdr != NULL)
1338 mdb_free(kt->k_dumphdr, sizeof (dumphdr_t));
1339
1340 mdb_gelf_destroy(kt->k_file);
1341
1342 (void) kt->k_kb_ops->kb_close(kt->k_cookie);
1343
1344 for (km = mdb_list_next(&kt->k_modlist); km; km = nkm) {
1345 if (km->km_symtab)
1346 mdb_gelf_symtab_destroy(km->km_symtab);
1347
1348 if (km->km_data)
1349 mdb_free(km->km_data, km->km_datasz);
1350
1351 if (km->km_ctfp)
1352 ctf_close(km->km_ctfp);
1353
1354 if (km->km_ctf_buf != NULL)
1355 mdb_free(km->km_ctf_buf, km->km_ctf_size);
1356
1357 nkm = mdb_list_next(km);
1358 strfree(km->km_name);
1359 mdb_free(km, sizeof (kt_module_t));
1360 }
1361
1362 mdb_nv_destroy(&kt->k_modules);
1363
1364 strfree(kt->k_kvmfile);
1365 if (kt->k_symfile != NULL)
1366 strfree(kt->k_symfile);
1367
1368 mdb_free(kt, sizeof (kt_data_t));
1369 }
1370
1371 static int
1372 kt_data_stub(void)
1373 {
1374 return (-1);
1375 }
1376
1377 int
1378 mdb_kvm_tgt_create(mdb_tgt_t *t, int argc, const char *argv[])
1379 {
1380 kt_data_t *kt = mdb_zalloc(sizeof (kt_data_t), UM_SLEEP);
1381 mdb_kb_ops_t *kvm_kb_ops = libkvm_kb_ops();
1382 int oflag = (t->t_flags & MDB_TGT_F_RDWR) ? O_RDWR : O_RDONLY;
1383 struct utsname uts;
1384 GElf_Sym sym;
1385 pgcnt_t pmem;
1386
1387
1388 if (argc == 2) {
1389 kt->k_symfile = strdup(argv[0]);
1390 kt->k_kvmfile = strdup(argv[1]);
1391
1392 kt->k_cookie = kvm_kb_ops->kb_open(kt->k_symfile,
1393 kt->k_kvmfile, NULL, oflag, (char *)mdb.m_pname);
1394
1395 if (kt->k_cookie == NULL)
1396 goto err;
1397
1398 kt->k_xpv_domu = 0;
1399 kt->k_kb_ops = kvm_kb_ops;
1400 } else {
1401 #ifndef __x86
1402 return (set_errno(EINVAL));
1403 #else
1404 mdb_kb_ops_t *(*getops)(void);
1405
1406 kt->k_symfile = NULL;
1407 kt->k_kvmfile = strdup(argv[0]);
1408
1409 getops = (mdb_kb_ops_t *(*)())dlsym(RTLD_NEXT, "mdb_kb_ops");
1410
1411 /*
1412 * Load mdb_kb if it's not already loaded during
1413 * identification.
1414 */
1415 if (getops == NULL) {
1416 (void) mdb_module_load("mdb_kb",
1417 MDB_MOD_GLOBAL | MDB_MOD_SILENT);
1418 getops = (mdb_kb_ops_t *(*)())
1419 dlsym(RTLD_NEXT, "mdb_kb_ops");
1420 }
1421
1422 if (getops == NULL || (kt->k_kb_ops = getops()) == NULL) {
1423 warn("failed to load KVM backend ops\n");
1424 goto err;
1425 }
1426
1427 kt->k_cookie = kt->k_kb_ops->kb_open(NULL, kt->k_kvmfile, NULL,
1428 oflag, (char *)mdb.m_pname);
1429
1430 if (kt->k_cookie == NULL)
1431 goto err;
1432
1433 kt->k_xpv_domu = 1;
1434 #endif
1435 }
1436
1437 if ((kt->k_fio = kt->k_kb_ops->kb_sym_io(kt->k_cookie,
1438 kt->k_symfile)) == NULL)
1439 goto err;
1440
1441 if ((kt->k_file = mdb_gelf_create(kt->k_fio,
1442 ET_EXEC, GF_FILE)) == NULL) {
1443 mdb_io_destroy(kt->k_fio);
1444 goto err;
1445 }
1446
1447 kt->k_symtab =
1448 mdb_gelf_symtab_create_file(kt->k_file, SHT_SYMTAB, MDB_TGT_SYMTAB);
1449
1450 kt->k_dynsym =
1451 mdb_gelf_symtab_create_file(kt->k_file, SHT_DYNSYM, MDB_TGT_DYNSYM);
1452
1453 if (mdb_gelf_symtab_lookup_by_name(kt->k_symtab, "kas",
1454 &sym, NULL) == -1) {
1455 warn("'kas' symbol is missing from kernel\n");
1456 goto err;
1457 }
1458
1459 kt->k_as = (struct as *)(uintptr_t)sym.st_value;
1460
1461 if (mdb_gelf_symtab_lookup_by_name(kt->k_symtab, "platform",
1462 &sym, NULL) == -1) {
1463 warn("'platform' symbol is missing from kernel\n");
1464 goto err;
1465 }
1466
1467 if (kt->k_kb_ops->kb_kread(kt->k_cookie, sym.st_value,
1468 kt->k_platform, MAXNAMELEN) <= 0) {
1469 warn("failed to read 'platform' string from kernel");
1470 goto err;
1471 }
1472
1473 if (mdb_gelf_symtab_lookup_by_name(kt->k_symtab, "utsname",
1474 &sym, NULL) == -1) {
1475 warn("'utsname' symbol is missing from kernel\n");
1476 goto err;
1477 }
1478
1479 if (kt->k_kb_ops->kb_kread(kt->k_cookie, sym.st_value, &uts,
1480 sizeof (uts)) <= 0) {
1481 warn("failed to read 'utsname' struct from kernel");
1482 goto err;
1483 }
1484
1485 kt->k_dump_print_content = (void (*)())kt_data_stub;
1486 kt->k_dump_find_curproc = kt_data_stub;
1487
1488 /*
1489 * We set k_ctfvalid based on the presence of the CTF vmem arena
1490 * symbol. The CTF members were added to the end of struct module at
1491 * the same time, so this allows us to know whether we can use them.
1492 */
1493 if (mdb_gelf_symtab_lookup_by_name(kt->k_symtab, "ctf_arena", &sym,
1494 NULL) == 0 && !(mdb.m_flags & MDB_FL_NOCTF))
1495 kt->k_ctfvalid = 1;
1496
1497 (void) mdb_nv_create(&kt->k_modules, UM_SLEEP);
1498 t->t_pshandle = kt->k_cookie;
1499 t->t_data = kt;
1500
1501 #if defined(__sparc)
1502 #if defined(__sparcv9)
1503 kt_sparcv9_init(t);
1504 #else
1505 kt_sparcv7_init(t);
1506 #endif
1507 #elif defined(__amd64)
1508 kt_amd64_init(t);
1509 #elif defined(__i386)
1510 kt_ia32_init(t);
1511 #else
1512 #error "unknown ISA"
1513 #endif
1514
1515 /*
1516 * We read our representative thread ID (address) from the kernel's
1517 * global panic_thread. It will remain 0 if this is a live kernel.
1518 */
1519 (void) mdb_tgt_readsym(t, MDB_TGT_AS_VIRT, &kt->k_tid, sizeof (void *),
1520 MDB_TGT_OBJ_EXEC, "panic_thread");
1521
1522 if ((mdb.m_flags & MDB_FL_ADB) && mdb_tgt_readsym(t, MDB_TGT_AS_VIRT,
1523 &pmem, sizeof (pmem), MDB_TGT_OBJ_EXEC, "physmem") == sizeof (pmem))
1524 mdb_printf("physmem %lx\n", (ulong_t)pmem);
1525
1526 /*
1527 * If this is not a live kernel or a hypervisor dump, read the dump
1528 * header. We don't have to sanity-check the header, as the open would
1529 * not have succeeded otherwise.
1530 */
1531 if (!kt->k_xpv_domu && strcmp(kt->k_symfile, "/dev/ksyms") != 0) {
1532 mdb_io_t *vmcore;
1533
1534 kt->k_dumphdr = mdb_alloc(sizeof (dumphdr_t), UM_SLEEP);
1535
1536 if ((vmcore = mdb_fdio_create_path(NULL, kt->k_kvmfile,
1537 O_RDONLY, 0)) == NULL) {
1538 mdb_warn("failed to open %s", kt->k_kvmfile);
1539 goto err;
1540 }
1541
1542 if (IOP_READ(vmcore, kt->k_dumphdr, sizeof (dumphdr_t)) !=
1543 sizeof (dumphdr_t)) {
1544 mdb_warn("failed to read dump header");
1545 mdb_io_destroy(vmcore);
1546 goto err;
1547 }
1548
1549 mdb_io_destroy(vmcore);
1550
1551 (void) mdb_tgt_xdata_insert(t, "dumphdr",
1552 "dump header structure", kt_xd_dumphdr);
1553 }
1554
1555 return (0);
1556
1557 err:
1558 if (kt->k_dumphdr != NULL)
1559 mdb_free(kt->k_dumphdr, sizeof (dumphdr_t));
1560
1561 if (kt->k_symtab != NULL)
1562 mdb_gelf_symtab_destroy(kt->k_symtab);
1563
1564 if (kt->k_dynsym != NULL)
1565 mdb_gelf_symtab_destroy(kt->k_dynsym);
1566
1567 if (kt->k_file != NULL)
1568 mdb_gelf_destroy(kt->k_file);
1569
1570 if (kt->k_cookie != NULL)
1571 (void) kt->k_kb_ops->kb_close(kt->k_cookie);
1572
1573 mdb_free(kt, sizeof (kt_data_t));
1574 return (-1);
1575 }
1576
1577 int
1578 mdb_kvm_is_dump(mdb_io_t *io)
1579 {
1580 dumphdr_t h;
1581
1582 (void) IOP_SEEK(io, (off64_t)0L, SEEK_SET);
1583
1584 return (IOP_READ(io, &h, sizeof (dumphdr_t)) == sizeof (dumphdr_t) &&
1585 h.dump_magic == DUMP_MAGIC);
1586 }
1587
1588 int
1589 mdb_kvm_is_compressed_dump(mdb_io_t *io)
1590 {
1591 dumphdr_t h;
1592
1593 (void) IOP_SEEK(io, (off64_t)0L, SEEK_SET);
1594
1595 return (IOP_READ(io, &h, sizeof (dumphdr_t)) == sizeof (dumphdr_t) &&
1596 h.dump_magic == DUMP_MAGIC &&
1597 (h.dump_flags & DF_COMPRESSED) != 0);
1598 }