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 * Copyright 2012, Josef 'Jeff' Sipek <jeffpc@31bits.net>. All rights reserved.
25 */
26
27 /*
28 * Copyright (c) 2013, Joyent, Inc. All rights reserved.
29 */
30
31 #include <sys/types.h>
32 #include <sys/mman.h>
33 #include <sys/priocntl.h>
34 #include <sys/rtpriocntl.h>
35 #include <sys/resource.h>
36 #include <sys/termios.h>
37 #include <sys/param.h>
38 #include <sys/regset.h>
39 #include <sys/frame.h>
40 #include <sys/stack.h>
41 #include <sys/reg.h>
42
43 #include <libproc.h>
44 #include <libscf.h>
45 #include <alloca.h>
46 #include <unistd.h>
47 #include <string.h>
48 #include <stdlib.h>
49 #include <fcntl.h>
50 #include <dlfcn.h>
51 #include <libctf.h>
52 #include <errno.h>
53 #include <kvm.h>
54
55 #include <mdb/mdb_lex.h>
56 #include <mdb/mdb_debug.h>
57 #include <mdb/mdb_signal.h>
58 #include <mdb/mdb_string.h>
59 #include <mdb/mdb_modapi.h>
60 #include <mdb/mdb_target.h>
61 #include <mdb/mdb_gelf.h>
62 #include <mdb/mdb_conf.h>
63 #include <mdb/mdb_err.h>
64 #include <mdb/mdb_io_impl.h>
65 #include <mdb/mdb_frame.h>
66 #include <mdb/mdb_set.h>
67 #include <kmdb/kmdb_kctl.h>
68 #include <mdb/mdb.h>
69
70 #ifndef STACK_BIAS
71 #define STACK_BIAS 0
72 #endif
73
74 #if defined(__sparc)
75 #define STACK_REGISTER SP
76 #else
77 #define STACK_REGISTER REG_FP
78 #endif
79
80 #ifdef _LP64
81 #define MDB_DEF_IPATH \
82 "%r/usr/platform/%p/lib/adb/%i:" \
83 "%r/usr/platform/%m/lib/adb/%i:" \
84 "%r/usr/lib/adb/%i"
85 #define MDB_DEF_LPATH \
86 "%r/usr/platform/%p/lib/mdb/%t/%i:" \
87 "%r/usr/platform/%m/lib/mdb/%t/%i:" \
88 "%r/usr/lib/mdb/%t/%i"
89 #else
90 #define MDB_DEF_IPATH \
91 "%r/usr/platform/%p/lib/adb:" \
92 "%r/usr/platform/%m/lib/adb:" \
93 "%r/usr/lib/adb"
94 #define MDB_DEF_LPATH \
95 "%r/usr/platform/%p/lib/mdb/%t:" \
96 "%r/usr/platform/%m/lib/mdb/%t:" \
97 "%r/usr/lib/mdb/%t"
98 #endif
99
100 #define MDB_DEF_PROMPT "> "
101
102 /*
103 * Similar to the panic_* variables in the kernel, we keep some relevant
104 * information stored in a set of global _mdb_abort_* variables; in the
105 * event that the debugger dumps core, these will aid core dump analysis.
106 */
107 const char *volatile _mdb_abort_str; /* reason for failure */
108 siginfo_t _mdb_abort_info; /* signal info for fatal signal */
109 ucontext_t _mdb_abort_ctx; /* context fatal signal interrupted */
110 int _mdb_abort_rcount; /* number of times resume requested */
111 int _mdb_self_fd = -1; /* fd for self as for valid_frame */
112
113 __NORETURN static void
114 terminate(int status)
115 {
116 (void) mdb_signal_blockall();
117 mdb_destroy();
118 exit(status);
119 }
120
121 static void
122 print_frame(uintptr_t pc, int fnum)
123 {
124 Dl_info dli;
125
126 if (dladdr((void *)pc, &dli)) {
127 mdb_iob_printf(mdb.m_err, " [%d] %s`%s+0x%lx()\n", fnum,
128 strbasename(dli.dli_fname), dli.dli_sname,
129 pc - (uintptr_t)dli.dli_saddr);
130 } else
131 mdb_iob_printf(mdb.m_err, " [%d] %p()\n", fnum, pc);
132 }
133
134 static int
135 valid_frame(struct frame *fr)
136 {
137 static struct frame fake;
138 uintptr_t addr = (uintptr_t)fr;
139
140 if (pread(_mdb_self_fd, &fake, sizeof (fake), addr) != sizeof (fake)) {
141 mdb_iob_printf(mdb.m_err, " invalid frame (%p)\n", fr);
142 return (0);
143 }
144
145 if (addr & (STACK_ALIGN - 1)) {
146 mdb_iob_printf(mdb.m_err, " mis-aligned frame (%p)\n", fr);
147 return (0);
148 }
149
150 return (1);
151 }
152
153 /*ARGSUSED*/
154 static void
155 flt_handler(int sig, siginfo_t *sip, ucontext_t *ucp, void *data)
156 {
157 static const struct rlimit rl = {
158 (rlim_t)RLIM_INFINITY, (rlim_t)RLIM_INFINITY
159 };
160
161 const mdb_idcmd_t *idcp = NULL;
162
163 if (mdb.m_frame != NULL && mdb.m_frame->f_cp != NULL)
164 idcp = mdb.m_frame->f_cp->c_dcmd;
165
166 if (sip != NULL)
167 bcopy(sip, &_mdb_abort_info, sizeof (_mdb_abort_info));
168 if (ucp != NULL)
169 bcopy(ucp, &_mdb_abort_ctx, sizeof (_mdb_abort_ctx));
170
171 _mdb_abort_info.si_signo = sig;
172 (void) mdb_signal_sethandler(sig, SIG_DFL, NULL);
173
174 /*
175 * If there is no current dcmd, or the current dcmd comes from a
176 * builtin module, we don't allow resume and always core dump.
177 */
178 if (idcp == NULL || idcp->idc_modp == NULL ||
179 idcp->idc_modp == &mdb.m_rmod || idcp->idc_modp->mod_hdl == NULL)
180 goto dump;
181
182 if (mdb.m_term != NULL) {
183 struct frame *fr = (struct frame *)
184 (ucp->uc_mcontext.gregs[STACK_REGISTER] + STACK_BIAS);
185
186 char signame[SIG2STR_MAX];
187 int i = 1;
188 char c;
189
190 if (sig2str(sig, signame) == -1) {
191 mdb_iob_printf(mdb.m_err,
192 "\n*** %s: received signal %d at:\n",
193 mdb.m_pname, sig);
194 } else {
195 mdb_iob_printf(mdb.m_err,
196 "\n*** %s: received signal %s at:\n",
197 mdb.m_pname, signame);
198 }
199
200 if (ucp->uc_mcontext.gregs[REG_PC] != 0)
201 print_frame(ucp->uc_mcontext.gregs[REG_PC], i++);
202
203 while (fr != NULL && valid_frame(fr) && fr->fr_savpc != 0) {
204 print_frame(fr->fr_savpc, i++);
205 fr = (struct frame *)
206 ((uintptr_t)fr->fr_savfp + STACK_BIAS);
207 }
208
209 query:
210 mdb_iob_printf(mdb.m_err, "\n%s: (c)ore dump, (q)uit, "
211 "(r)ecover, or (s)top for debugger [cqrs]? ", mdb.m_pname);
212
213 mdb_iob_flush(mdb.m_err);
214
215 for (;;) {
216 if (IOP_READ(mdb.m_term, &c, sizeof (c)) != sizeof (c))
217 goto dump;
218
219 switch (c) {
220 case 'c':
221 case 'C':
222 (void) setrlimit(RLIMIT_CORE, &rl);
223 mdb_iob_printf(mdb.m_err, "\n%s: attempting "
224 "to dump core ...\n", mdb.m_pname);
225 goto dump;
226
227 case 'q':
228 case 'Q':
229 mdb_iob_discard(mdb.m_out);
230 mdb_iob_nl(mdb.m_err);
231 (void) mdb_signal_unblockall();
232 terminate(1);
233 /*NOTREACHED*/
234
235 case 'r':
236 case 'R':
237 mdb_iob_printf(mdb.m_err, "\n%s: unloading "
238 "module '%s' ...\n", mdb.m_pname,
239 idcp->idc_modp->mod_name);
240
241 (void) mdb_module_unload(
242 idcp->idc_modp->mod_name, 0);
243
244 (void) mdb_signal_sethandler(sig,
245 flt_handler, NULL);
246
247 _mdb_abort_rcount++;
248 mdb.m_intr = 0;
249 mdb.m_pend = 0;
250
251 (void) mdb_signal_unblockall();
252 longjmp(mdb.m_frame->f_pcb, MDB_ERR_ABORT);
253 /*NOTREACHED*/
254
255 case 's':
256 case 'S':
257 mdb_iob_printf(mdb.m_err, "\n%s: "
258 "attempting to stop pid %d ...\n",
259 mdb.m_pname, (int)getpid());
260
261 /*
262 * Stop ourself; if this fails or we are
263 * subsequently continued, ask again.
264 */
265 (void) mdb_signal_raise(SIGSTOP);
266 (void) mdb_signal_unblockall();
267 goto query;
268 }
269 }
270 }
271
272 dump:
273 if (SI_FROMUSER(sip)) {
274 (void) mdb_signal_block(sig);
275 (void) mdb_signal_raise(sig);
276 }
277
278 (void) sigfillset(&ucp->uc_sigmask);
279 (void) sigdelset(&ucp->uc_sigmask, sig);
280
281 if (_mdb_abort_str == NULL)
282 _mdb_abort_str = "fatal signal received";
283
284 ucp->uc_flags |= UC_SIGMASK;
285 (void) setcontext(ucp);
286 }
287
288 /*ARGSUSED*/
289 static void
290 int_handler(int sig, siginfo_t *sip, ucontext_t *ucp, void *data)
291 {
292 if (mdb.m_intr == 0)
293 longjmp(mdb.m_frame->f_pcb, MDB_ERR_SIGINT);
294 else
295 mdb.m_pend++;
296 }
297
298 static void
299 control_kmdb(int start)
300 {
301 int fd;
302
303 if ((fd = open("/dev/kmdb", O_RDONLY)) < 0)
304 die("failed to open /dev/kmdb");
305
306 if (start) {
307 char *state = mdb_get_config();
308
309 if (ioctl(fd, KMDB_IOC_START, state) < 0)
310 die("failed to start kmdb");
311
312 strfree(state);
313 } else {
314 if (ioctl(fd, KMDB_IOC_STOP) < 0)
315 die("failed to stop kmdb");
316 }
317
318 (void) close(fd);
319 }
320
321 static void
322 usage(int status)
323 {
324 mdb_iob_printf(mdb.m_err, "Usage: %s [-fkmuwyAFKMSUW] [+/-o option] "
325 "[-p pid] [-s dist] [-I path] [-L path]\n\t[-P prompt] "
326 "[-R root] [-V dis-version] [-e expr] "
327 "[object [core] | core | suffix]\n\n",
328 mdb.m_pname);
329
330 mdb_iob_puts(mdb.m_err,
331 "\t-e evaluate expr and return status\n"
332 "\t-f force raw file debugging mode\n"
333 "\t-k force kernel debugging mode\n"
334 "\t-m disable demand-loading of module symbols\n"
335 "\t-o set specified debugger option (+o to unset)\n"
336 "\t-p attach to specified process-id\n"
337 "\t-s set symbol matching distance\n"
338 "\t-u force user program debugging mode\n"
339 "\t-w enable write mode\n"
340 "\t-y send terminal initialization sequences for tty mode\n"
341 "\t-A disable automatic loading of mdb modules\n"
342 "\t-F enable forcible takeover mode\n"
343 "\t-K stop operating system and enter live kernel debugger\n"
344 "\t-M preload all module symbols\n"
345 "\t-I set initial path for macro files\n"
346 "\t-L set initial path for module libs\n"
347 "\t-P set command-line prompt\n"
348 "\t-R set root directory for pathname expansion\n"
349 "\t-S suppress processing of ~/.mdbrc file\n"
350 "\t-U unload live kernel debugger\n"
351 "\t-W enable I/O-mapped memory access (kernel only)\n"
352 "\t-V set disassembler version\n");
353
354 terminate(status);
355 }
356
357 static char *
358 mdb_scf_console_term(void)
359 {
360 scf_simple_prop_t *prop;
361 char *term = NULL;
362
363 if ((prop = scf_simple_prop_get(NULL,
364 "svc:/system/console-login:default", "ttymon",
365 "terminal_type")) == NULL)
366 return (NULL);
367
368 if (scf_simple_prop_type(prop) == SCF_TYPE_ASTRING &&
369 (term = scf_simple_prop_next_astring(prop)) != NULL)
370 term = strdup(term);
371
372 scf_simple_prop_free(prop);
373 return (term);
374 }
375
376 /*
377 * Unpleasant hack: we might be debugging a hypervisor domain dump.
378 * Earlier versions use a non-ELF file. Later versions are ELF, but are
379 * /always/ ELF64, so our standard ehdr check isn't good enough. Since
380 * we don't want to know too much about the file format, we'll ask
381 * mdb_kb.
382 */
383 #ifdef __x86
384 static int
385 identify_xvm_file(const char *file, int *longmode)
386 {
387 int (*identify)(const char *, int *);
388
389 if (mdb_module_load("mdb_kb", MDB_MOD_GLOBAL | MDB_MOD_SILENT) != 0)
390 return (0);
391
392 identify = (int (*)())dlsym(RTLD_NEXT, "xkb_identify");
393
394 if (identify == NULL)
395 return (0);
396
397 return (identify(file, longmode));
398 }
399 #else
400 /*ARGSUSED*/
401 static int
402 identify_xvm_file(const char *file, int *longmode)
403 {
404 return (0);
405 }
406 #endif /* __x86 */
407
408 int
409 main(int argc, char *argv[], char *envp[])
410 {
411 extern int mdb_kvm_is_compressed_dump(mdb_io_t *);
412 extern int mdb_kvm_is_dump(mdb_io_t *);
413 mdb_tgt_ctor_f *tgt_ctor = NULL;
414 const char **tgt_argv = alloca((argc + 2) * sizeof (char *));
415 int tgt_argc = 0;
416 mdb_tgt_t *tgt;
417
418 char object[MAXPATHLEN], execname[MAXPATHLEN];
419 mdb_io_t *in_io, *out_io, *err_io, *null_io;
420 struct termios tios;
421 int status, c;
422 char *p;
423
424 const char *Iflag = NULL, *Lflag = NULL, *Vflag = NULL, *pidarg = NULL;
425 const char *eflag = NULL;
426 int fflag = 0, Kflag = 0, Rflag = 0, Sflag = 0, Oflag = 0, Uflag = 0;
427
428 int ttylike;
429 int longmode = 0;
430
431 stack_t sigstack;
432
433 if (realpath(getexecname(), execname) == NULL) {
434 (void) strncpy(execname, argv[0], MAXPATHLEN);
435 execname[MAXPATHLEN - 1] = '\0';
436 }
437
438 mdb_create(execname, argv[0]);
439 bzero(tgt_argv, argc * sizeof (char *));
440 argv[0] = (char *)mdb.m_pname;
441 _mdb_self_fd = open("/proc/self/as", O_RDONLY);
442
443 mdb.m_env = envp;
444
445 out_io = mdb_fdio_create(STDOUT_FILENO);
446 mdb.m_out = mdb_iob_create(out_io, MDB_IOB_WRONLY);
447
448 err_io = mdb_fdio_create(STDERR_FILENO);
449 mdb.m_err = mdb_iob_create(err_io, MDB_IOB_WRONLY);
450 mdb_iob_clrflags(mdb.m_err, MDB_IOB_AUTOWRAP);
451
452 null_io = mdb_nullio_create();
453 mdb.m_null = mdb_iob_create(null_io, MDB_IOB_WRONLY);
454
455 in_io = mdb_fdio_create(STDIN_FILENO);
456 if ((mdb.m_termtype = getenv("TERM")) != NULL) {
457 mdb.m_termtype = strdup(mdb.m_termtype);
458 mdb.m_flags |= MDB_FL_TERMGUESS;
459 }
460 mdb.m_term = NULL;
461
462 mdb_dmode(mdb_dstr2mode(getenv("MDB_DEBUG")));
463 mdb.m_pgid = getpgrp();
464
465 if (getenv("_MDB_EXEC") != NULL)
466 mdb.m_flags |= MDB_FL_EXEC;
467
468 /*
469 * Setup an alternate signal stack. When tearing down pipelines in
470 * terminate(), we may have to destroy the stack of the context in
471 * which we are currently executing the signal handler.
472 */
473 sigstack.ss_sp = mmap(NULL, SIGSTKSZ, PROT_READ | PROT_WRITE,
474 MAP_PRIVATE | MAP_ANON, -1, 0);
475 if (sigstack.ss_sp == MAP_FAILED)
476 die("could not allocate signal stack");
477 sigstack.ss_size = SIGSTKSZ;
478 sigstack.ss_flags = 0;
479 if (sigaltstack(&sigstack, NULL) != 0)
480 die("could not set signal stack");
481
482 (void) mdb_signal_sethandler(SIGPIPE, SIG_IGN, NULL);
483 (void) mdb_signal_sethandler(SIGQUIT, SIG_IGN, NULL);
484
485 (void) mdb_signal_sethandler(SIGILL, flt_handler, NULL);
486 (void) mdb_signal_sethandler(SIGTRAP, flt_handler, NULL);
487 (void) mdb_signal_sethandler(SIGIOT, flt_handler, NULL);
488 (void) mdb_signal_sethandler(SIGEMT, flt_handler, NULL);
489 (void) mdb_signal_sethandler(SIGFPE, flt_handler, NULL);
490 (void) mdb_signal_sethandler(SIGBUS, flt_handler, NULL);
491 (void) mdb_signal_sethandler(SIGSEGV, flt_handler, NULL);
492
493 (void) mdb_signal_sethandler(SIGHUP, (mdb_signal_f *)terminate, NULL);
494 (void) mdb_signal_sethandler(SIGTERM, (mdb_signal_f *)terminate, NULL);
495
496 for (mdb.m_rdvers = RD_VERSION; mdb.m_rdvers > 0; mdb.m_rdvers--) {
497 if (rd_init(mdb.m_rdvers) == RD_OK)
498 break;
499 }
500
501 for (mdb.m_ctfvers = CTF_VERSION; mdb.m_ctfvers > 0; mdb.m_ctfvers--) {
502 if (ctf_version(mdb.m_ctfvers) != -1)
503 break;
504 }
505
506 if ((p = getenv("HISTSIZE")) != NULL && strisnum(p)) {
507 mdb.m_histlen = strtoi(p);
508 if (mdb.m_histlen < 1)
509 mdb.m_histlen = 1;
510 }
511
512 while (optind < argc) {
513 while ((c = getopt(argc, argv,
514 "e:fkmo:p:s:uwyACD:FI:KL:MOP:R:SUV:W")) != (int)EOF) {
515 switch (c) {
516 case 'e':
517 if (eflag != NULL) {
518 warn("-e already specified\n");
519 terminate(2);
520 }
521 eflag = optarg;
522 break;
523 case 'f':
524 fflag++;
525 tgt_ctor = mdb_rawfile_tgt_create;
526 break;
527 case 'k':
528 tgt_ctor = mdb_kvm_tgt_create;
529 break;
530 case 'm':
531 mdb.m_tgtflags |= MDB_TGT_F_NOLOAD;
532 mdb.m_tgtflags &= ~MDB_TGT_F_PRELOAD;
533 break;
534 case 'o':
535 if (!mdb_set_options(optarg, TRUE))
536 terminate(2);
537 break;
538 case 'p':
539 tgt_ctor = mdb_proc_tgt_create;
540 pidarg = optarg;
541 break;
542 case 's':
543 if (!strisnum(optarg)) {
544 warn("expected integer following -s\n");
545 terminate(2);
546 }
547 mdb.m_symdist = (size_t)(uint_t)strtoi(optarg);
548 break;
549 case 'u':
550 tgt_ctor = mdb_proc_tgt_create;
551 break;
552 case 'w':
553 mdb.m_tgtflags |= MDB_TGT_F_RDWR;
554 break;
555 case 'y':
556 mdb.m_flags |= MDB_FL_USECUP;
557 break;
558 case 'A':
559 (void) mdb_set_options("nomods", TRUE);
560 break;
561 case 'C':
562 (void) mdb_set_options("noctf", TRUE);
563 break;
564 case 'D':
565 mdb_dmode(mdb_dstr2mode(optarg));
566 break;
567 case 'F':
568 mdb.m_tgtflags |= MDB_TGT_F_FORCE;
569 break;
570 case 'I':
571 Iflag = optarg;
572 break;
573 case 'L':
574 Lflag = optarg;
575 break;
576 case 'K':
577 Kflag++;
578 break;
579 case 'M':
580 mdb.m_tgtflags |= MDB_TGT_F_PRELOAD;
581 mdb.m_tgtflags &= ~MDB_TGT_F_NOLOAD;
582 break;
583 case 'O':
584 Oflag++;
585 break;
586 case 'P':
587 if (!mdb_set_prompt(optarg))
588 terminate(2);
589 break;
590 case 'R':
591 (void) strncpy(mdb.m_root, optarg, MAXPATHLEN);
592 mdb.m_root[MAXPATHLEN - 1] = '\0';
593 Rflag++;
594 break;
595 case 'S':
596 Sflag++;
597 break;
598 case 'U':
599 Uflag++;
600 break;
601 case 'V':
602 Vflag = optarg;
603 break;
604 case 'W':
605 mdb.m_tgtflags |= MDB_TGT_F_ALLOWIO;
606 break;
607 case '?':
608 if (optopt == '?')
609 usage(0);
610 /* FALLTHROUGH */
611 default:
612 usage(2);
613 }
614 }
615
616 if (optind < argc) {
617 const char *arg = argv[optind++];
618
619 if (arg[0] == '+' && strlen(arg) == 2) {
620 if (arg[1] != 'o') {
621 warn("illegal option -- %s\n", arg);
622 terminate(2);
623 }
624 if (optind >= argc) {
625 warn("option requires an argument -- "
626 "%s\n", arg);
627 terminate(2);
628 }
629 if (!mdb_set_options(argv[optind++], FALSE))
630 terminate(2);
631 } else
632 tgt_argv[tgt_argc++] = arg;
633 }
634 }
635
636 if (rd_ctl(RD_CTL_SET_HELPPATH, (void *)mdb.m_root) != RD_OK) {
637 warn("cannot set librtld_db helper path to %s\n", mdb.m_root);
638 terminate(2);
639 }
640
641 if (mdb.m_debug & MDB_DBG_HELP)
642 terminate(0); /* Quit here if we've printed out the tokens */
643
644
645 if (Iflag != NULL && strchr(Iflag, ';') != NULL) {
646 warn("macro path cannot contain semicolons\n");
647 terminate(2);
648 }
649
650 if (Lflag != NULL && strchr(Lflag, ';') != NULL) {
651 warn("module path cannot contain semicolons\n");
652 terminate(2);
653 }
654
655 if (Kflag || Uflag) {
656 char *nm;
657
658 if (tgt_ctor != NULL || Iflag != NULL) {
659 warn("neither -f, -k, -p, -u, nor -I "
660 "may be used with -K\n");
661 usage(2);
662 }
663
664 if (Lflag != NULL)
665 mdb_set_lpath(Lflag);
666
667 if ((nm = ttyname(STDIN_FILENO)) == NULL ||
668 strcmp(nm, "/dev/console") != 0) {
669 /*
670 * Due to the consequences of typing mdb -K instead of
671 * mdb -k on a tty other than /dev/console, we require
672 * -F when starting kmdb from a tty other than
673 * /dev/console.
674 */
675 if (!(mdb.m_tgtflags & MDB_TGT_F_FORCE)) {
676 die("-F must also be supplied to start kmdb "
677 "from non-console tty\n");
678 }
679
680 if (mdb.m_termtype == NULL || (mdb.m_flags &
681 MDB_FL_TERMGUESS)) {
682 if (mdb.m_termtype != NULL)
683 strfree(mdb.m_termtype);
684
685 if ((mdb.m_termtype = mdb_scf_console_term()) !=
686 NULL)
687 mdb.m_flags |= MDB_FL_TERMGUESS;
688 }
689 } else {
690 /*
691 * When on console, $TERM (if set) takes precedence over
692 * the SMF setting.
693 */
694 if (mdb.m_termtype == NULL && (mdb.m_termtype =
695 mdb_scf_console_term()) != NULL)
696 mdb.m_flags |= MDB_FL_TERMGUESS;
697 }
698
699 control_kmdb(Kflag);
700 terminate(0);
701 /*NOTREACHED*/
702 }
703
704 if (eflag != NULL) {
705 IOP_CLOSE(in_io);
706 in_io = mdb_strio_create(eflag);
707 mdb.m_lastret = 0;
708 }
709
710 /*
711 * If standard input appears to have tty attributes, attempt to
712 * initialize a terminal i/o backend on top of stdin and stdout.
713 */
714 ttylike = (IOP_CTL(in_io, TCGETS, &tios) == 0);
715 if (ttylike) {
716 if ((mdb.m_term = mdb_termio_create(mdb.m_termtype,
717 in_io, out_io)) == NULL) {
718 if (!(mdb.m_flags & MDB_FL_EXEC)) {
719 warn("term init failed: command-line editing "
720 "and prompt will not be available\n");
721 }
722 } else {
723 in_io = mdb.m_term;
724 }
725 }
726
727 mdb.m_in = mdb_iob_create(in_io, MDB_IOB_RDONLY);
728 if (mdb.m_term != NULL) {
729 mdb_iob_setpager(mdb.m_out, mdb.m_term);
730 if (mdb.m_flags & MDB_FL_PAGER)
731 mdb_iob_setflags(mdb.m_out, MDB_IOB_PGENABLE);
732 else
733 mdb_iob_clrflags(mdb.m_out, MDB_IOB_PGENABLE);
734 } else if (ttylike)
735 mdb_iob_setflags(mdb.m_in, MDB_IOB_TTYLIKE);
736 else
737 mdb_iob_setbuf(mdb.m_in, mdb_alloc(1, UM_SLEEP), 1);
738
739 mdb_pservice_init();
740 mdb_lex_reset();
741
742 if ((mdb.m_shell = getenv("SHELL")) == NULL)
743 mdb.m_shell = "/bin/sh";
744
745 /*
746 * If the debugger state is to be inherited from a previous instance,
747 * restore it now prior to path evaluation so that %R is updated.
748 */
749 if ((p = getenv(MDB_CONFIG_ENV_VAR)) != NULL) {
750 mdb_set_config(p);
751 (void) unsetenv(MDB_CONFIG_ENV_VAR);
752 }
753
754 /*
755 * Path evaluation part 1: Create the initial module path to allow
756 * the target constructor to load a support module. Then expand
757 * any command-line arguments that modify the paths.
758 */
759 if (Iflag != NULL)
760 mdb_set_ipath(Iflag);
761 else
762 mdb_set_ipath(MDB_DEF_IPATH);
763
764 if (Lflag != NULL)
765 mdb_set_lpath(Lflag);
766 else
767 mdb_set_lpath(MDB_DEF_LPATH);
768
769 if (mdb_get_prompt() == NULL && !(mdb.m_flags & MDB_FL_ADB))
770 (void) mdb_set_prompt(MDB_DEF_PROMPT);
771
772 if (tgt_ctor == mdb_kvm_tgt_create) {
773 if (pidarg != NULL) {
774 warn("-p and -k options are mutually exclusive\n");
775 terminate(2);
776 }
777
778 if (tgt_argc == 0)
779 tgt_argv[tgt_argc++] = "/dev/ksyms";
780 if (tgt_argc == 1 && strisnum(tgt_argv[0]) == 0) {
781 if (mdb.m_tgtflags & MDB_TGT_F_ALLOWIO)
782 tgt_argv[tgt_argc++] = "/dev/allkmem";
783 else
784 tgt_argv[tgt_argc++] = "/dev/kmem";
785 }
786 }
787
788 if (pidarg != NULL) {
789 if (tgt_argc != 0) {
790 warn("-p may not be used with other arguments\n");
791 terminate(2);
792 }
793 if (proc_arg_psinfo(pidarg, PR_ARG_PIDS, NULL, &status) == -1) {
794 die("cannot attach to %s: %s\n",
795 pidarg, Pgrab_error(status));
796 }
797 if (strchr(pidarg, '/') != NULL)
798 (void) mdb_iob_snprintf(object, MAXPATHLEN,
799 "%s/object/a.out", pidarg);
800 else
801 (void) mdb_iob_snprintf(object, MAXPATHLEN,
802 "/proc/%s/object/a.out", pidarg);
803 tgt_argv[tgt_argc++] = object;
804 tgt_argv[tgt_argc++] = pidarg;
805 }
806
807 /*
808 * Find the first argument that is not a special "-" token. If one is
809 * found, we will examine this file and make some inferences below.
810 */
811 for (c = 0; c < tgt_argc && strcmp(tgt_argv[c], "-") == 0; c++)
812 continue;
813
814 if (c < tgt_argc) {
815 Elf32_Ehdr ehdr;
816 mdb_io_t *io;
817
818 /*
819 * If special "-" tokens preceded an argument, shift the entire
820 * argument list to the left to remove the leading "-" args.
821 */
822 if (c > 0) {
823 bcopy(&tgt_argv[c], tgt_argv,
824 sizeof (const char *) * (tgt_argc - c));
825 tgt_argc -= c;
826 }
827
828 if (fflag)
829 goto tcreate; /* skip re-exec and just create target */
830
831 /*
832 * If we just have an object file name, and that file doesn't
833 * exist, and it's a string of digits, infer it to be a
834 * sequence number referring to a pair of crash dump files.
835 */
836 if (tgt_argc == 1 && access(tgt_argv[0], F_OK) == -1 &&
837 strisnum(tgt_argv[0])) {
838
839 size_t len = strlen(tgt_argv[0]) + 8;
840 const char *object = tgt_argv[0];
841
842 tgt_argv[0] = alloca(len);
843 tgt_argv[1] = alloca(len);
844
845 (void) strcpy((char *)tgt_argv[0], "unix.");
846 (void) strcat((char *)tgt_argv[0], object);
847 (void) strcpy((char *)tgt_argv[1], "vmcore.");
848 (void) strcat((char *)tgt_argv[1], object);
849
850 if (access(tgt_argv[0], F_OK) == -1 &&
851 access(tgt_argv[1], F_OK) != -1) {
852 /*
853 * If we have a vmcore but not a unix file,
854 * set the symbol table to be the vmcore to
855 * force libkvm to extract it out of the dump.
856 */
857 tgt_argv[0] = tgt_argv[1];
858 } else if (access(tgt_argv[0], F_OK) == -1 &&
859 access(tgt_argv[1], F_OK) == -1) {
860 (void) strcpy((char *)tgt_argv[1], "vmdump.");
861 (void) strcat((char *)tgt_argv[1], object);
862 if (access(tgt_argv[1], F_OK) == 0) {
863 mdb_iob_printf(mdb.m_err,
864 "cannot open compressed dump; "
865 "decompress using savecore -f %s\n",
866 tgt_argv[1]);
867 terminate(0);
868 }
869 }
870
871 tgt_argc = 2;
872 }
873
874 /*
875 * We need to open the object file in order to determine its
876 * ELF class and potentially re-exec ourself.
877 */
878 if ((io = mdb_fdio_create_path(NULL, tgt_argv[0],
879 O_RDONLY, 0)) == NULL)
880 die("failed to open %s", tgt_argv[0]);
881
882 if (tgt_argc == 1) {
883 if (mdb_kvm_is_compressed_dump(io)) {
884 /*
885 * We have a single vmdump.N compressed dump
886 * file; give a helpful message.
887 */
888 mdb_iob_printf(mdb.m_err,
889 "cannot open compressed dump; "
890 "decompress using savecore -f %s\n",
891 tgt_argv[0]);
892 terminate(0);
893 } else if (mdb_kvm_is_dump(io)) {
894 /*
895 * We have an uncompressed dump as our only
896 * argument; specify the dump as the symbol
897 * table to force libkvm to dig it out of the
898 * dump.
899 */
900 tgt_argv[tgt_argc++] = tgt_argv[0];
901 }
902 }
903
904 /*
905 * If the target is unknown or is not the rawfile target, do
906 * a gelf_check to determine if the file is an ELF file. If
907 * it is not and the target is unknown, use the rawfile tgt.
908 * Otherwise an ELF-based target is needed, so we must abort.
909 */
910 if (mdb_gelf_check(io, &ehdr, ET_NONE) == -1) {
911 if (tgt_ctor != NULL) {
912 (void) mdb_gelf_check(io, &ehdr, ET_EXEC);
913 mdb_io_destroy(io);
914 terminate(1);
915 } else
916 tgt_ctor = mdb_rawfile_tgt_create;
917 }
918
919 mdb_io_destroy(io);
920
921 if (identify_xvm_file(tgt_argv[0], &longmode) == 1) {
922 #ifdef _LP64
923 if (!longmode)
924 goto reexec;
925 #else
926 if (longmode)
927 goto reexec;
928 #endif
929 tgt_ctor = mdb_kvm_tgt_create;
930 goto tcreate;
931 }
932
933 /*
934 * The object file turned out to be a user core file (ET_CORE),
935 * and no other arguments were specified, swap 0 and 1. The
936 * proc target will infer the executable for us.
937 */
938 if (ehdr.e_type == ET_CORE) {
939 tgt_argv[tgt_argc++] = tgt_argv[0];
940 tgt_argv[0] = NULL;
941 tgt_ctor = mdb_proc_tgt_create;
942 }
943
944 /*
945 * If tgt_argv[1] is filled in, open it up and determine if it
946 * is a vmcore file. If it is, gelf_check will fail and we
947 * set tgt_ctor to 'kvm'; otherwise we use the default.
948 */
949 if (tgt_argc > 1 && strcmp(tgt_argv[1], "-") != 0 &&
950 tgt_argv[0] != NULL && pidarg == NULL) {
951 Elf32_Ehdr chdr;
952
953 if (access(tgt_argv[1], F_OK) == -1)
954 die("failed to access %s", tgt_argv[1]);
955
956 /* *.N case: drop vmdump.N from the list */
957 if (tgt_argc == 3) {
958 if ((io = mdb_fdio_create_path(NULL,
959 tgt_argv[2], O_RDONLY, 0)) == NULL)
960 die("failed to open %s", tgt_argv[2]);
961 if (mdb_kvm_is_compressed_dump(io))
962 tgt_argv[--tgt_argc] = NULL;
963 mdb_io_destroy(io);
964 }
965
966 if ((io = mdb_fdio_create_path(NULL, tgt_argv[1],
967 O_RDONLY, 0)) == NULL)
968 die("failed to open %s", tgt_argv[1]);
969
970 if (mdb_gelf_check(io, &chdr, ET_NONE) == -1)
971 tgt_ctor = mdb_kvm_tgt_create;
972
973 mdb_io_destroy(io);
974 }
975
976 /*
977 * At this point, we've read the ELF header for either an
978 * object file or core into ehdr. If the class does not match
979 * ours, attempt to exec the mdb of the appropriate class.
980 */
981 #ifdef _LP64
982 if (ehdr.e_ident[EI_CLASS] == ELFCLASS32)
983 goto reexec;
984 #else
985 if (ehdr.e_ident[EI_CLASS] == ELFCLASS64)
986 goto reexec;
987 #endif
988 }
989
990 tcreate:
991 if (tgt_ctor == NULL)
992 tgt_ctor = mdb_proc_tgt_create;
993
994 tgt = mdb_tgt_create(tgt_ctor, mdb.m_tgtflags, tgt_argc, tgt_argv);
995
996 if (tgt == NULL) {
997 if (errno == EINVAL)
998 usage(2); /* target can return EINVAL to get usage */
999 if (errno == EMDB_TGT)
1000 terminate(1); /* target already printed error msg */
1001 die("failed to initialize target");
1002 }
1003
1004 mdb_tgt_activate(tgt);
1005
1006 mdb_create_loadable_disasms();
1007
1008 if (Vflag != NULL && mdb_dis_select(Vflag) == -1)
1009 warn("invalid disassembler mode -- %s\n", Vflag);
1010
1011
1012 if (Rflag && mdb.m_term != NULL)
1013 warn("Using proto area %s\n", mdb.m_root);
1014
1015 /*
1016 * If the target was successfully constructed and -O was specified,
1017 * we now attempt to enter piggy-mode for debugging jurassic problems.
1018 */
1019 if (Oflag) {
1020 pcinfo_t pci;
1021
1022 (void) strcpy(pci.pc_clname, "RT");
1023
1024 if (priocntl(P_LWPID, P_MYID, PC_GETCID, (caddr_t)&pci) != -1) {
1025 pcparms_t pcp;
1026 rtparms_t *rtp = (rtparms_t *)pcp.pc_clparms;
1027
1028 rtp->rt_pri = 35;
1029 rtp->rt_tqsecs = 0;
1030 rtp->rt_tqnsecs = RT_TQDEF;
1031
1032 pcp.pc_cid = pci.pc_cid;
1033
1034 if (priocntl(P_LWPID, P_MYID, PC_SETPARMS,
1035 (caddr_t)&pcp) == -1) {
1036 warn("failed to set RT parameters");
1037 Oflag = 0;
1038 }
1039 } else {
1040 warn("failed to get RT class id");
1041 Oflag = 0;
1042 }
1043
1044 if (mlockall(MCL_CURRENT | MCL_FUTURE) == -1) {
1045 warn("failed to lock address space");
1046 Oflag = 0;
1047 }
1048
1049 if (Oflag)
1050 mdb_printf("%s: oink, oink!\n", mdb.m_pname);
1051 }
1052
1053 /*
1054 * Path evaluation part 2: Re-evaluate the path now that the target
1055 * is ready (and thus we have access to the real platform string).
1056 * Do this before reading ~/.mdbrc to allow path modifications prior
1057 * to performing module auto-loading.
1058 */
1059 mdb_set_ipath(mdb.m_ipathstr);
1060 mdb_set_lpath(mdb.m_lpathstr);
1061
1062 if (!Sflag && (p = getenv("HOME")) != NULL) {
1063 char rcpath[MAXPATHLEN];
1064 mdb_io_t *rc_io;
1065 int fd;
1066
1067 (void) mdb_iob_snprintf(rcpath, MAXPATHLEN, "%s/.mdbrc", p);
1068 fd = open64(rcpath, O_RDONLY);
1069
1070 if (fd >= 0 && (rc_io = mdb_fdio_create_named(fd, rcpath))) {
1071 mdb_iob_t *iob = mdb_iob_create(rc_io, MDB_IOB_RDONLY);
1072 mdb_iob_t *old = mdb.m_in;
1073
1074 mdb.m_in = iob;
1075 (void) mdb_run();
1076 mdb.m_in = old;
1077 }
1078 }
1079
1080 if (!(mdb.m_flags & MDB_FL_NOMODS))
1081 mdb_module_load_all(0);
1082
1083 (void) mdb_signal_sethandler(SIGINT, int_handler, NULL);
1084 while ((status = mdb_run()) == MDB_ERR_ABORT ||
1085 status == MDB_ERR_OUTPUT) {
1086 /*
1087 * If a write failed on stdout, give up. A more informative
1088 * error message will already have been printed by mdb_run().
1089 */
1090 if (status == MDB_ERR_OUTPUT &&
1091 mdb_iob_getflags(mdb.m_out) & MDB_IOB_ERR) {
1092 mdb_warn("write to stdout failed, exiting\n");
1093 break;
1094 }
1095 continue;
1096 }
1097
1098 terminate((status == MDB_ERR_QUIT || status == 0) ?
1099 (eflag != NULL && mdb.m_lastret != 0 ? 1 : 0) : 1);
1100 /*NOTREACHED*/
1101 return (0);
1102
1103 reexec:
1104 if ((p = strrchr(execname, '/')) == NULL)
1105 die("cannot determine absolute pathname\n");
1106 #ifdef _LP64
1107 #ifdef __sparc
1108 (void) strcpy(p, "/../sparcv7/");
1109 #else
1110 (void) strcpy(p, "/../i86/");
1111 #endif
1112 #else
1113 #ifdef __sparc
1114 (void) strcpy(p, "/../sparcv9/");
1115 #else
1116 (void) strcpy(p, "/../amd64/");
1117 #endif
1118 #endif
1119 (void) strcat(p, mdb.m_pname);
1120
1121 if (mdb.m_term != NULL)
1122 (void) IOP_CTL(in_io, TCSETSW, &tios);
1123
1124 (void) putenv("_MDB_EXEC=1");
1125 (void) execv(execname, argv);
1126
1127 /*
1128 * If execv fails, suppress ENOEXEC. Experience shows the most common
1129 * reason is that the machine is booted under a 32-bit kernel, in which
1130 * case it is clearer to only print the message below.
1131 */
1132 if (errno != ENOEXEC)
1133 warn("failed to exec %s", execname);
1134 #ifdef _LP64
1135 die("64-bit %s cannot debug 32-bit program %s\n",
1136 mdb.m_pname, tgt_argv[0] ?
1137 tgt_argv[0] : tgt_argv[1]);
1138 #else
1139 die("32-bit %s cannot debug 64-bit program %s\n",
1140 mdb.m_pname, tgt_argv[0] ?
1141 tgt_argv[0] : tgt_argv[1]);
1142 #endif
1143
1144 goto tcreate;
1145 }