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 2019 Joyent, Inc. 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 1102 reexec: 1103 if ((p = strrchr(execname, '/')) == NULL) 1104 die("cannot determine absolute pathname\n"); 1105 #ifdef _LP64 1106 #ifdef __sparc 1107 (void) strcpy(p, "/../sparcv7/"); 1108 #else 1109 (void) strcpy(p, "/../i86/"); 1110 #endif 1111 #else 1112 #ifdef __sparc 1113 (void) strcpy(p, "/../sparcv9/"); 1114 #else 1115 (void) strcpy(p, "/../amd64/"); 1116 #endif 1117 #endif 1118 (void) strcat(p, mdb.m_pname); 1119 1120 if (mdb.m_term != NULL) 1121 (void) IOP_CTL(in_io, TCSETSW, &tios); 1122 1123 (void) putenv("_MDB_EXEC=1"); 1124 (void) execv(execname, argv); 1125 1126 /* 1127 * If execv fails, suppress ENOEXEC. Experience shows the most common 1128 * reason is that the machine is booted under a 32-bit kernel, in which 1129 * case it is clearer to only print the message below. 1130 */ 1131 if (errno != ENOEXEC) 1132 warn("failed to exec %s", execname); 1133 #ifdef _LP64 1134 die("64-bit %s cannot debug 32-bit program %s\n", 1135 mdb.m_pname, tgt_argv[0] ? 1136 tgt_argv[0] : tgt_argv[1]); 1137 #else 1138 die("32-bit %s cannot debug 64-bit program %s\n", 1139 mdb.m_pname, tgt_argv[0] ? 1140 tgt_argv[0] : tgt_argv[1]); 1141 #endif 1142 1143 goto tcreate; 1144 } 1145