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 2008 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 #pragma ident "%Z%%M% %I% %E% SMI" 27 28 #include <sys/types.h> 29 #include <sys/mman.h> 30 #include <sys/priocntl.h> 31 #include <sys/rtpriocntl.h> 32 #include <sys/resource.h> 33 #include <sys/termios.h> 34 #include <sys/param.h> 35 #include <sys/regset.h> 36 #include <sys/frame.h> 37 #include <sys/stack.h> 38 #include <sys/reg.h> 39 40 #include <libproc.h> 41 #include <libscf.h> 42 #include <alloca.h> 43 #include <unistd.h> 44 #include <string.h> 45 #include <stdlib.h> 46 #include <fcntl.h> 47 #include <dlfcn.h> 48 #include <libctf.h> 49 #include <errno.h> 50 #include <kvm.h> 51 52 #include <mdb/mdb_lex.h> 53 #include <mdb/mdb_debug.h> 54 #include <mdb/mdb_signal.h> 55 #include <mdb/mdb_string.h> 56 #include <mdb/mdb_modapi.h> 57 #include <mdb/mdb_target.h> 58 #include <mdb/mdb_gelf.h> 59 #include <mdb/mdb_conf.h> 60 #include <mdb/mdb_err.h> 61 #include <mdb/mdb_io_impl.h> 62 #include <mdb/mdb_frame.h> 63 #include <mdb/mdb_set.h> 64 #include <kmdb/kmdb_kctl.h> 65 #include <mdb/mdb.h> 66 67 #ifndef STACK_BIAS 68 #define STACK_BIAS 0 69 #endif 70 71 #if defined(__sparc) 72 #define STACK_REGISTER SP 73 #else 74 #define STACK_REGISTER REG_FP 75 #endif 76 77 #ifdef _LP64 78 #define MDB_DEF_IPATH \ 79 "%r/usr/platform/%p/lib/adb/%i:" \ 80 "%r/usr/platform/%m/lib/adb/%i:" \ 81 "%r/usr/lib/adb/%i" 82 #define MDB_DEF_LPATH \ 83 "%r/usr/platform/%p/lib/mdb/%t/%i:" \ 84 "%r/usr/platform/%m/lib/mdb/%t/%i:" \ 85 "%r/usr/lib/mdb/%t/%i" 86 #else 87 #define MDB_DEF_IPATH \ 88 "%r/usr/platform/%p/lib/adb:" \ 89 "%r/usr/platform/%m/lib/adb:" \ 90 "%r/usr/lib/adb" 91 #define MDB_DEF_LPATH \ 92 "%r/usr/platform/%p/lib/mdb/%t:" \ 93 "%r/usr/platform/%m/lib/mdb/%t:" \ 94 "%r/usr/lib/mdb/%t" 95 #endif 96 97 #define MDB_DEF_PROMPT "> " 98 99 /* 100 * Similar to the panic_* variables in the kernel, we keep some relevant 101 * information stored in a set of global _mdb_abort_* variables; in the 102 * event that the debugger dumps core, these will aid core dump analysis. 103 */ 104 const char *volatile _mdb_abort_str; /* reason for failure */ 105 siginfo_t _mdb_abort_info; /* signal info for fatal signal */ 106 ucontext_t _mdb_abort_ctx; /* context fatal signal interrupted */ 107 int _mdb_abort_rcount; /* number of times resume requested */ 108 int _mdb_self_fd = -1; /* fd for self as for valid_frame */ 109 110 static void 111 terminate(int status) 112 { 113 mdb_destroy(); 114 exit(status); 115 } 116 117 static void 118 print_frame(uintptr_t pc, int fnum) 119 { 120 Dl_info dli; 121 122 if (dladdr((void *)pc, &dli)) { 123 mdb_iob_printf(mdb.m_err, " [%d] %s`%s+0x%lx()\n", fnum, 124 strbasename(dli.dli_fname), dli.dli_sname, 125 pc - (uintptr_t)dli.dli_saddr); 126 } else 127 mdb_iob_printf(mdb.m_err, " [%d] %p()\n", fnum, pc); 128 } 129 130 static int 131 valid_frame(struct frame *fr) 132 { 133 static struct frame fake; 134 uintptr_t addr = (uintptr_t)fr; 135 136 if (pread(_mdb_self_fd, &fake, sizeof (fake), addr) != sizeof (fake)) { 137 mdb_iob_printf(mdb.m_err, " invalid frame (%p)\n", fr); 138 return (0); 139 } 140 141 if (addr & (STACK_ALIGN - 1)) { 142 mdb_iob_printf(mdb.m_err, " mis-aligned frame (%p)\n", fr); 143 return (0); 144 } 145 146 return (1); 147 } 148 149 /*ARGSUSED*/ 150 static void 151 flt_handler(int sig, siginfo_t *sip, ucontext_t *ucp, void *data) 152 { 153 static const struct rlimit rl = { 154 (rlim_t)RLIM_INFINITY, (rlim_t)RLIM_INFINITY 155 }; 156 157 const mdb_idcmd_t *idcp = NULL; 158 159 if (mdb.m_frame != NULL && mdb.m_frame->f_cp != NULL) 160 idcp = mdb.m_frame->f_cp->c_dcmd; 161 162 if (sip != NULL) 163 bcopy(sip, &_mdb_abort_info, sizeof (_mdb_abort_info)); 164 if (ucp != NULL) 165 bcopy(ucp, &_mdb_abort_ctx, sizeof (_mdb_abort_ctx)); 166 167 _mdb_abort_info.si_signo = sig; 168 (void) mdb_signal_sethandler(sig, SIG_DFL, NULL); 169 170 /* 171 * If there is no current dcmd, or the current dcmd comes from a 172 * builtin module, we don't allow resume and always core dump. 173 */ 174 if (idcp == NULL || idcp->idc_modp == NULL || 175 idcp->idc_modp == &mdb.m_rmod || idcp->idc_modp->mod_hdl == NULL) 176 goto dump; 177 178 if (mdb.m_term != NULL) { 179 struct frame *fr = (struct frame *) 180 (ucp->uc_mcontext.gregs[STACK_REGISTER] + STACK_BIAS); 181 182 char signame[SIG2STR_MAX]; 183 int i = 1; 184 char c; 185 186 if (sig2str(sig, signame) == -1) { 187 mdb_iob_printf(mdb.m_err, 188 "\n*** %s: received signal %d at:\n", 189 mdb.m_pname, sig); 190 } else { 191 mdb_iob_printf(mdb.m_err, 192 "\n*** %s: received signal %s at:\n", 193 mdb.m_pname, signame); 194 } 195 196 if (ucp->uc_mcontext.gregs[REG_PC] != 0) 197 print_frame(ucp->uc_mcontext.gregs[REG_PC], i++); 198 199 while (fr != NULL && valid_frame(fr) && fr->fr_savpc != 0) { 200 print_frame(fr->fr_savpc, i++); 201 fr = (struct frame *) 202 ((uintptr_t)fr->fr_savfp + STACK_BIAS); 203 } 204 205 query: 206 mdb_iob_printf(mdb.m_err, "\n%s: (c)ore dump, (q)uit, " 207 "(r)ecover, or (s)top for debugger [cqrs]? ", mdb.m_pname); 208 209 mdb_iob_flush(mdb.m_err); 210 211 for (;;) { 212 if (IOP_READ(mdb.m_term, &c, sizeof (c)) != sizeof (c)) 213 goto dump; 214 215 switch (c) { 216 case 'c': 217 case 'C': 218 (void) setrlimit(RLIMIT_CORE, &rl); 219 mdb_iob_printf(mdb.m_err, "\n%s: attempting " 220 "to dump core ...\n", mdb.m_pname); 221 goto dump; 222 223 case 'q': 224 case 'Q': 225 mdb_iob_discard(mdb.m_out); 226 mdb_iob_nl(mdb.m_err); 227 (void) mdb_signal_unblockall(); 228 terminate(1); 229 /*NOTREACHED*/ 230 231 case 'r': 232 case 'R': 233 mdb_iob_printf(mdb.m_err, "\n%s: unloading " 234 "module '%s' ...\n", mdb.m_pname, 235 idcp->idc_modp->mod_name); 236 237 (void) mdb_module_unload( 238 idcp->idc_modp->mod_name, 0); 239 240 (void) mdb_signal_sethandler(sig, 241 flt_handler, NULL); 242 243 _mdb_abort_rcount++; 244 mdb.m_intr = 0; 245 mdb.m_pend = 0; 246 247 (void) mdb_signal_unblockall(); 248 longjmp(mdb.m_frame->f_pcb, MDB_ERR_ABORT); 249 /*NOTREACHED*/ 250 251 case 's': 252 case 'S': 253 mdb_iob_printf(mdb.m_err, "\n%s: " 254 "attempting to stop pid %d ...\n", 255 mdb.m_pname, (int)getpid()); 256 257 /* 258 * Stop ourself; if this fails or we are 259 * subsequently continued, ask again. 260 */ 261 (void) mdb_signal_raise(SIGSTOP); 262 (void) mdb_signal_unblockall(); 263 goto query; 264 } 265 } 266 } 267 268 dump: 269 if (SI_FROMUSER(sip)) { 270 (void) mdb_signal_block(sig); 271 (void) mdb_signal_raise(sig); 272 } 273 274 (void) sigfillset(&ucp->uc_sigmask); 275 (void) sigdelset(&ucp->uc_sigmask, sig); 276 277 if (_mdb_abort_str == NULL) 278 _mdb_abort_str = "fatal signal received"; 279 280 ucp->uc_flags |= UC_SIGMASK; 281 (void) setcontext(ucp); 282 } 283 284 /*ARGSUSED*/ 285 static void 286 int_handler(int sig, siginfo_t *sip, ucontext_t *ucp, void *data) 287 { 288 if (mdb.m_intr == 0) 289 longjmp(mdb.m_frame->f_pcb, MDB_ERR_SIGINT); 290 else 291 mdb.m_pend++; 292 } 293 294 static void 295 control_kmdb(int start) 296 { 297 int fd; 298 299 if ((fd = open("/dev/kmdb", O_RDONLY)) < 0) 300 die("failed to open /dev/kmdb"); 301 302 if (start) { 303 char *state = mdb_get_config(); 304 305 if (ioctl(fd, KMDB_IOC_START, state) < 0) 306 die("failed to start kmdb"); 307 308 strfree(state); 309 } else { 310 if (ioctl(fd, KMDB_IOC_STOP) < 0) 311 die("failed to stop kmdb"); 312 } 313 314 close(fd); 315 } 316 317 static void 318 usage(int status) 319 { 320 mdb_iob_printf(mdb.m_err, "Usage: %s [-fkmuwyAFKMSUW] [+/-o option] " 321 "[-p pid] [-s dist] [-I path] [-L path]\n\t[-P prompt] " 322 "[-R root] [-V dis-version] [object [core] | core | suffix]\n\n", 323 mdb.m_pname); 324 325 mdb_iob_puts(mdb.m_err, 326 "\t-f force raw file debugging mode\n" 327 "\t-k force kernel debugging mode\n" 328 "\t-m disable demand-loading of module symbols\n" 329 "\t-o set specified debugger option (+o to unset)\n" 330 "\t-p attach to specified process-id\n" 331 "\t-s set symbol matching distance\n" 332 "\t-u force user program debugging mode\n" 333 "\t-w enable write mode\n" 334 "\t-y send terminal initialization sequences for tty mode\n" 335 "\t-A disable automatic loading of mdb modules\n" 336 "\t-F enable forcible takeover mode\n" 337 "\t-K stop operating system and enter live kernel debugger\n" 338 "\t-M preload all module symbols\n" 339 "\t-I set initial path for macro files\n" 340 "\t-L set initial path for module libs\n" 341 "\t-P set command-line prompt\n" 342 "\t-R set root directory for pathname expansion\n" 343 "\t-S suppress processing of ~/.mdbrc file\n" 344 "\t-U unload live kernel debugger\n" 345 "\t-W enable I/O-mapped memory access (kernel only)\n" 346 "\t-V set disassembler version\n"); 347 348 terminate(status); 349 } 350 351 static char * 352 mdb_scf_console_term(void) 353 { 354 scf_simple_prop_t *prop; 355 char *term = NULL; 356 357 if ((prop = scf_simple_prop_get(NULL, 358 "svc:/system/console-login:default", "ttymon", 359 "terminal_type")) == NULL) 360 return (NULL); 361 362 if (scf_simple_prop_type(prop) == SCF_TYPE_ASTRING && 363 (term = scf_simple_prop_next_astring(prop)) != NULL) 364 term = strdup(term); 365 366 scf_simple_prop_free(prop); 367 return (term); 368 } 369 370 /* 371 * Unpleasant hack: we might be debugging a hypervisor domain dump. 372 * Earlier versions use a non-ELF file. Later versions are ELF, but are 373 * /always/ ELF64, so our standard ehdr check isn't good enough. Since 374 * we don't want to know too much about the file format, we'll ask 375 * mdb_kb. 376 */ 377 #ifdef __x86 378 static int 379 identify_xvm_file(const char *file, int *longmode) 380 { 381 int (*identify)(const char *, int *); 382 383 if (mdb_module_load("mdb_kb", MDB_MOD_GLOBAL | MDB_MOD_SILENT) != 0) 384 return (0); 385 386 identify = (int (*)())dlsym(RTLD_NEXT, "xkb_identify"); 387 388 if (identify == NULL) 389 return (0); 390 391 return (identify(file, longmode)); 392 } 393 #else 394 /*ARGSUSED*/ 395 static int 396 identify_xvm_file(const char *file, int *longmode) 397 { 398 return (0); 399 } 400 #endif /* __x86 */ 401 402 int 403 main(int argc, char *argv[], char *envp[]) 404 { 405 mdb_tgt_ctor_f *tgt_ctor = NULL; 406 const char **tgt_argv = alloca(argc * sizeof (char *)); 407 int tgt_argc = 0; 408 mdb_tgt_t *tgt; 409 410 char object[MAXPATHLEN], execname[MAXPATHLEN]; 411 mdb_io_t *in_io, *out_io, *err_io, *null_io; 412 struct termios tios; 413 int status, c; 414 char *p; 415 416 const char *Iflag = NULL, *Lflag = NULL, *Vflag = NULL, *pidarg = NULL; 417 int fflag = 0, Kflag = 0, Rflag = 0, Sflag = 0, Oflag = 0, Uflag = 0; 418 419 int ttylike; 420 int longmode = 0; 421 422 stack_t sigstack; 423 424 if (realpath(getexecname(), execname) == NULL) { 425 (void) strncpy(execname, argv[0], MAXPATHLEN); 426 execname[MAXPATHLEN - 1] = '\0'; 427 } 428 429 mdb_create(execname, argv[0]); 430 bzero(tgt_argv, argc * sizeof (char *)); 431 argv[0] = (char *)mdb.m_pname; 432 _mdb_self_fd = open("/proc/self/as", O_RDONLY); 433 434 mdb.m_env = envp; 435 436 out_io = mdb_fdio_create(STDOUT_FILENO); 437 mdb.m_out = mdb_iob_create(out_io, MDB_IOB_WRONLY); 438 439 err_io = mdb_fdio_create(STDERR_FILENO); 440 mdb.m_err = mdb_iob_create(err_io, MDB_IOB_WRONLY); 441 mdb_iob_clrflags(mdb.m_err, MDB_IOB_AUTOWRAP); 442 443 null_io = mdb_nullio_create(); 444 mdb.m_null = mdb_iob_create(null_io, MDB_IOB_WRONLY); 445 446 in_io = mdb_fdio_create(STDIN_FILENO); 447 if ((mdb.m_termtype = getenv("TERM")) != NULL) { 448 mdb.m_termtype = strdup(mdb.m_termtype); 449 mdb.m_flags |= MDB_FL_TERMGUESS; 450 } 451 mdb.m_term = NULL; 452 453 mdb_dmode(mdb_dstr2mode(getenv("MDB_DEBUG"))); 454 mdb.m_pgid = getpgrp(); 455 456 if (getenv("_MDB_EXEC") != NULL) 457 mdb.m_flags |= MDB_FL_EXEC; 458 459 /* 460 * Setup an alternate signal stack. When tearing down pipelines in 461 * terminate(), we may have to destroy the stack of the context in 462 * which we are currently executing the signal handler. 463 */ 464 sigstack.ss_sp = mmap(NULL, SIGSTKSZ, PROT_READ | PROT_WRITE, 465 MAP_PRIVATE | MAP_ANON, -1, 0); 466 if (sigstack.ss_sp == MAP_FAILED) 467 die("could not allocate signal stack"); 468 sigstack.ss_size = SIGSTKSZ; 469 sigstack.ss_flags = 0; 470 if (sigaltstack(&sigstack, NULL) != 0) 471 die("could not set signal stack"); 472 473 (void) mdb_signal_sethandler(SIGPIPE, SIG_IGN, NULL); 474 (void) mdb_signal_sethandler(SIGQUIT, SIG_IGN, NULL); 475 476 (void) mdb_signal_sethandler(SIGILL, flt_handler, NULL); 477 (void) mdb_signal_sethandler(SIGTRAP, flt_handler, NULL); 478 (void) mdb_signal_sethandler(SIGIOT, flt_handler, NULL); 479 (void) mdb_signal_sethandler(SIGEMT, flt_handler, NULL); 480 (void) mdb_signal_sethandler(SIGFPE, flt_handler, NULL); 481 (void) mdb_signal_sethandler(SIGBUS, flt_handler, NULL); 482 (void) mdb_signal_sethandler(SIGSEGV, flt_handler, NULL); 483 484 (void) mdb_signal_sethandler(SIGHUP, (mdb_signal_f *)terminate, NULL); 485 (void) mdb_signal_sethandler(SIGTERM, (mdb_signal_f *)terminate, NULL); 486 487 for (mdb.m_rdvers = RD_VERSION; mdb.m_rdvers > 0; mdb.m_rdvers--) { 488 if (rd_init(mdb.m_rdvers) == RD_OK) 489 break; 490 } 491 492 for (mdb.m_ctfvers = CTF_VERSION; mdb.m_ctfvers > 0; mdb.m_ctfvers--) { 493 if (ctf_version(mdb.m_ctfvers) != -1) 494 break; 495 } 496 497 if ((p = getenv("HISTSIZE")) != NULL && strisnum(p)) { 498 mdb.m_histlen = strtoi(p); 499 if (mdb.m_histlen < 1) 500 mdb.m_histlen = 1; 501 } 502 503 while (optind < argc) { 504 while ((c = getopt(argc, argv, 505 "fkmo:p:s:uwyACD:FI:KL:MOP:R:SUV:W")) != (int)EOF) { 506 switch (c) { 507 case 'f': 508 fflag++; 509 tgt_ctor = mdb_rawfile_tgt_create; 510 break; 511 case 'k': 512 tgt_ctor = mdb_kvm_tgt_create; 513 break; 514 case 'm': 515 mdb.m_tgtflags |= MDB_TGT_F_NOLOAD; 516 mdb.m_tgtflags &= ~MDB_TGT_F_PRELOAD; 517 break; 518 case 'o': 519 if (!mdb_set_options(optarg, TRUE)) 520 terminate(2); 521 break; 522 case 'p': 523 tgt_ctor = mdb_proc_tgt_create; 524 pidarg = optarg; 525 break; 526 case 's': 527 if (!strisnum(optarg)) { 528 warn("expected integer following -s\n"); 529 terminate(2); 530 } 531 mdb.m_symdist = (size_t)(uint_t)strtoi(optarg); 532 break; 533 case 'u': 534 tgt_ctor = mdb_proc_tgt_create; 535 break; 536 case 'w': 537 mdb.m_tgtflags |= MDB_TGT_F_RDWR; 538 break; 539 case 'y': 540 mdb.m_flags |= MDB_FL_USECUP; 541 break; 542 case 'A': 543 (void) mdb_set_options("nomods", TRUE); 544 break; 545 case 'C': 546 (void) mdb_set_options("noctf", TRUE); 547 break; 548 case 'D': 549 mdb_dmode(mdb_dstr2mode(optarg)); 550 break; 551 case 'F': 552 mdb.m_tgtflags |= MDB_TGT_F_FORCE; 553 break; 554 case 'I': 555 Iflag = optarg; 556 break; 557 case 'L': 558 Lflag = optarg; 559 break; 560 case 'K': 561 Kflag++; 562 break; 563 case 'M': 564 mdb.m_tgtflags |= MDB_TGT_F_PRELOAD; 565 mdb.m_tgtflags &= ~MDB_TGT_F_NOLOAD; 566 break; 567 case 'O': 568 Oflag++; 569 break; 570 case 'P': 571 if (!mdb_set_prompt(optarg)) 572 terminate(2); 573 break; 574 case 'R': 575 (void) strncpy(mdb.m_root, optarg, MAXPATHLEN); 576 mdb.m_root[MAXPATHLEN - 1] = '\0'; 577 Rflag++; 578 break; 579 case 'S': 580 Sflag++; 581 break; 582 case 'U': 583 Uflag++; 584 break; 585 case 'V': 586 Vflag = optarg; 587 break; 588 case 'W': 589 mdb.m_tgtflags |= MDB_TGT_F_ALLOWIO; 590 break; 591 case '?': 592 if (optopt == '?') 593 usage(0); 594 /* FALLTHROUGH */ 595 default: 596 usage(2); 597 } 598 } 599 600 if (optind < argc) { 601 const char *arg = argv[optind++]; 602 603 if (arg[0] == '+' && strlen(arg) == 2) { 604 if (arg[1] != 'o') { 605 warn("illegal option -- %s\n", arg); 606 terminate(2); 607 } 608 if (optind >= argc) { 609 warn("option requires an argument -- " 610 "%s\n", arg); 611 terminate(2); 612 } 613 if (!mdb_set_options(argv[optind++], FALSE)) 614 terminate(2); 615 } else 616 tgt_argv[tgt_argc++] = arg; 617 } 618 } 619 620 if (rd_ctl(RD_CTL_SET_HELPPATH, (void *)mdb.m_root) != RD_OK) { 621 warn("cannot set librtld_db helper path to %s\n", mdb.m_root); 622 terminate(2); 623 } 624 625 if (mdb.m_debug & MDB_DBG_HELP) 626 terminate(0); /* Quit here if we've printed out the tokens */ 627 628 629 if (Iflag != NULL && strchr(Iflag, ';') != NULL) { 630 warn("macro path cannot contain semicolons\n"); 631 terminate(2); 632 } 633 634 if (Lflag != NULL && strchr(Lflag, ';') != NULL) { 635 warn("module path cannot contain semicolons\n"); 636 terminate(2); 637 } 638 639 if (Kflag || Uflag) { 640 char *nm; 641 642 if (tgt_ctor != NULL || Iflag != NULL) { 643 warn("neither -f, -k, -p, -u, nor -I " 644 "may be used with -K\n"); 645 usage(2); 646 } 647 648 if (Lflag != NULL) 649 mdb_set_lpath(Lflag); 650 651 if ((nm = ttyname(STDIN_FILENO)) == NULL || 652 strcmp(nm, "/dev/console") != 0) { 653 /* 654 * Due to the consequences of typing mdb -K instead of 655 * mdb -k on a tty other than /dev/console, we require 656 * -F when starting kmdb from a tty other than 657 * /dev/console. 658 */ 659 if (!(mdb.m_tgtflags & MDB_TGT_F_FORCE)) { 660 die("-F must also be supplied to start kmdb " 661 "from non-console tty\n"); 662 } 663 664 if (mdb.m_termtype == NULL || (mdb.m_flags & 665 MDB_FL_TERMGUESS)) { 666 if (mdb.m_termtype != NULL) 667 strfree(mdb.m_termtype); 668 669 if ((mdb.m_termtype = mdb_scf_console_term()) != 670 NULL) 671 mdb.m_flags |= MDB_FL_TERMGUESS; 672 } 673 } else { 674 /* 675 * When on console, $TERM (if set) takes precedence over 676 * the SMF setting. 677 */ 678 if (mdb.m_termtype == NULL && (mdb.m_termtype = 679 mdb_scf_console_term()) != NULL) 680 mdb.m_flags |= MDB_FL_TERMGUESS; 681 } 682 683 control_kmdb(Kflag); 684 terminate(0); 685 /*NOTREACHED*/ 686 } 687 688 /* 689 * If standard input appears to have tty attributes, attempt to 690 * initialize a terminal i/o backend on top of stdin and stdout. 691 */ 692 ttylike = (IOP_CTL(in_io, TCGETS, &tios) == 0); 693 if (ttylike) { 694 if ((mdb.m_term = mdb_termio_create(mdb.m_termtype, 695 in_io, out_io)) == NULL) { 696 if (!(mdb.m_flags & MDB_FL_EXEC)) { 697 warn("term init failed: command-line editing " 698 "and prompt will not be available\n"); 699 } 700 } else { 701 in_io = mdb.m_term; 702 } 703 } 704 705 mdb.m_in = mdb_iob_create(in_io, MDB_IOB_RDONLY); 706 if (mdb.m_term != NULL) { 707 mdb_iob_setpager(mdb.m_out, mdb.m_term); 708 if (mdb.m_flags & MDB_FL_PAGER) 709 mdb_iob_setflags(mdb.m_out, MDB_IOB_PGENABLE); 710 else 711 mdb_iob_clrflags(mdb.m_out, MDB_IOB_PGENABLE); 712 } else if (ttylike) 713 mdb_iob_setflags(mdb.m_in, MDB_IOB_TTYLIKE); 714 else 715 mdb_iob_setbuf(mdb.m_in, mdb_alloc(1, UM_SLEEP), 1); 716 717 mdb_pservice_init(); 718 mdb_lex_reset(); 719 720 if ((mdb.m_shell = getenv("SHELL")) == NULL) 721 mdb.m_shell = "/bin/sh"; 722 723 /* 724 * If the debugger state is to be inherited from a previous instance, 725 * restore it now prior to path evaluation so that %R is updated. 726 */ 727 if ((p = getenv(MDB_CONFIG_ENV_VAR)) != NULL) { 728 mdb_set_config(p); 729 (void) unsetenv(MDB_CONFIG_ENV_VAR); 730 } 731 732 /* 733 * Path evaluation part 1: Create the initial module path to allow 734 * the target constructor to load a support module. Then expand 735 * any command-line arguments that modify the paths. 736 */ 737 if (Iflag != NULL) 738 mdb_set_ipath(Iflag); 739 else 740 mdb_set_ipath(MDB_DEF_IPATH); 741 742 if (Lflag != NULL) 743 mdb_set_lpath(Lflag); 744 else 745 mdb_set_lpath(MDB_DEF_LPATH); 746 747 if (mdb_get_prompt() == NULL && !(mdb.m_flags & MDB_FL_ADB)) 748 (void) mdb_set_prompt(MDB_DEF_PROMPT); 749 750 if (tgt_ctor == mdb_kvm_tgt_create) { 751 if (pidarg != NULL) { 752 warn("-p and -k options are mutually exclusive\n"); 753 terminate(2); 754 } 755 756 if (tgt_argc == 0) 757 tgt_argv[tgt_argc++] = "/dev/ksyms"; 758 if (tgt_argc == 1 && strisnum(tgt_argv[0]) == 0) { 759 if (mdb.m_tgtflags & MDB_TGT_F_ALLOWIO) 760 tgt_argv[tgt_argc++] = "/dev/allkmem"; 761 else 762 tgt_argv[tgt_argc++] = "/dev/kmem"; 763 } 764 } 765 766 if (pidarg != NULL) { 767 if (tgt_argc != 0) { 768 warn("-p may not be used with other arguments\n"); 769 terminate(2); 770 } 771 if (proc_arg_psinfo(pidarg, PR_ARG_PIDS, NULL, &status) == -1) { 772 die("cannot attach to %s: %s\n", 773 pidarg, Pgrab_error(status)); 774 } 775 if (strchr(pidarg, '/') != NULL) 776 (void) mdb_iob_snprintf(object, MAXPATHLEN, 777 "%s/object/a.out", pidarg); 778 else 779 (void) mdb_iob_snprintf(object, MAXPATHLEN, 780 "/proc/%s/object/a.out", pidarg); 781 tgt_argv[tgt_argc++] = object; 782 tgt_argv[tgt_argc++] = pidarg; 783 } 784 785 /* 786 * Find the first argument that is not a special "-" token. If one is 787 * found, we will examine this file and make some inferences below. 788 */ 789 for (c = 0; c < tgt_argc && strcmp(tgt_argv[c], "-") == 0; c++) 790 continue; 791 792 if (c < tgt_argc) { 793 Elf32_Ehdr ehdr; 794 mdb_io_t *io; 795 796 /* 797 * If special "-" tokens preceded an argument, shift the entire 798 * argument list to the left to remove the leading "-" args. 799 */ 800 if (c > 0) { 801 bcopy(&tgt_argv[c], tgt_argv, 802 sizeof (const char *) * (tgt_argc - c)); 803 tgt_argc -= c; 804 } 805 806 /* 807 * If we just have an object file name, and that file doesn't 808 * exist, and it's a string of digits, infer it to be a 809 * sequence number referring to a pair of crash dump files. 810 */ 811 if (tgt_argc == 1 && access(tgt_argv[0], F_OK) == -1 && 812 strisnum(tgt_argv[0])) { 813 814 size_t len = strlen(tgt_argv[0]) + 8; 815 const char *object = tgt_argv[0]; 816 817 tgt_argv[0] = mdb_alloc(len, UM_SLEEP); 818 tgt_argv[1] = mdb_alloc(len, UM_SLEEP); 819 820 (void) strcpy((char *)tgt_argv[0], "unix."); 821 (void) strcat((char *)tgt_argv[0], object); 822 (void) strcpy((char *)tgt_argv[1], "vmcore."); 823 (void) strcat((char *)tgt_argv[1], object); 824 825 tgt_argc = 2; 826 } 827 828 /* 829 * We need to open the object file in order to determine its 830 * ELF class and potentially re-exec ourself. 831 */ 832 if ((io = mdb_fdio_create_path(NULL, tgt_argv[0], 833 O_RDONLY, 0)) == NULL) 834 die("failed to open %s", tgt_argv[0]); 835 836 /* 837 * If the target is unknown or is not the rawfile target, do 838 * a gelf_check to determine if the file is an ELF file. If 839 * it is not and the target is unknown, use the rawfile tgt. 840 * Otherwise an ELF-based target is needed, so we must abort. 841 */ 842 if (tgt_ctor != mdb_rawfile_tgt_create && 843 mdb_gelf_check(io, &ehdr, ET_NONE) == -1) { 844 if (tgt_ctor != NULL) { 845 (void) mdb_gelf_check(io, &ehdr, ET_EXEC); 846 mdb_io_destroy(io); 847 terminate(1); 848 } else 849 tgt_ctor = mdb_rawfile_tgt_create; 850 } 851 852 mdb_io_destroy(io); 853 854 if (identify_xvm_file(tgt_argv[0], &longmode) == 1 && 855 !fflag) { 856 #ifdef _LP64 857 if (!longmode) 858 goto reexec; 859 #else 860 if (longmode) 861 goto reexec; 862 #endif 863 tgt_ctor = mdb_kvm_tgt_create; 864 goto tcreate; 865 } 866 867 if (tgt_ctor == mdb_rawfile_tgt_create) 868 goto tcreate; /* skip re-exec and just create target */ 869 870 /* 871 * The object file turned out to be a user core file (ET_CORE), 872 * and no other arguments were specified, swap 0 and 1. The 873 * proc target will infer the executable for us. 874 */ 875 if (ehdr.e_type == ET_CORE) { 876 tgt_argv[tgt_argc++] = tgt_argv[0]; 877 tgt_argv[0] = NULL; 878 tgt_ctor = mdb_proc_tgt_create; 879 } 880 881 /* 882 * If tgt_argv[1] is filled in, open it up and determine if it 883 * is a vmcore file. If it is, gelf_check will fail and we 884 * set tgt_ctor to 'kvm'; otherwise we use the default. 885 */ 886 if (tgt_argc > 1 && strcmp(tgt_argv[1], "-") != 0 && 887 tgt_argv[0] != NULL && pidarg == NULL) { 888 Elf32_Ehdr chdr; 889 890 if (access(tgt_argv[1], F_OK) == -1) 891 die("failed to access %s", tgt_argv[1]); 892 893 if ((io = mdb_fdio_create_path(NULL, tgt_argv[1], 894 O_RDONLY, 0)) == NULL) 895 die("failed to open %s", tgt_argv[1]); 896 897 if (mdb_gelf_check(io, &chdr, ET_NONE) == -1) 898 tgt_ctor = mdb_kvm_tgt_create; 899 900 mdb_io_destroy(io); 901 } 902 903 /* 904 * At this point, we've read the ELF header for either an 905 * object file or core into ehdr. If the class does not match 906 * ours, attempt to exec the mdb of the appropriate class. 907 */ 908 #ifdef _LP64 909 if (ehdr.e_ident[EI_CLASS] == ELFCLASS32) 910 goto reexec; 911 #else 912 if (ehdr.e_ident[EI_CLASS] == ELFCLASS64) 913 goto reexec; 914 #endif 915 } 916 917 tcreate: 918 if (tgt_ctor == NULL) 919 tgt_ctor = mdb_proc_tgt_create; 920 921 tgt = mdb_tgt_create(tgt_ctor, mdb.m_tgtflags, tgt_argc, tgt_argv); 922 923 if (tgt == NULL) { 924 if (errno == EINVAL) 925 usage(2); /* target can return EINVAL to get usage */ 926 if (errno == EMDB_TGT) 927 terminate(1); /* target already printed error msg */ 928 die("failed to initialize target"); 929 } 930 931 mdb_tgt_activate(tgt); 932 933 mdb_create_loadable_disasms(); 934 935 if (Vflag != NULL && mdb_dis_select(Vflag) == -1) 936 warn("invalid disassembler mode -- %s\n", Vflag); 937 938 939 if (Rflag && mdb.m_term != NULL) 940 warn("Using proto area %s\n", mdb.m_root); 941 942 /* 943 * If the target was successfully constructed and -O was specified, 944 * we now attempt to enter piggy-mode for debugging jurassic problems. 945 */ 946 if (Oflag) { 947 pcinfo_t pci; 948 949 (void) strcpy(pci.pc_clname, "RT"); 950 951 if (priocntl(P_LWPID, P_MYID, PC_GETCID, (caddr_t)&pci) != -1) { 952 pcparms_t pcp; 953 rtparms_t *rtp = (rtparms_t *)pcp.pc_clparms; 954 955 rtp->rt_pri = 35; 956 rtp->rt_tqsecs = 0; 957 rtp->rt_tqnsecs = RT_TQDEF; 958 959 pcp.pc_cid = pci.pc_cid; 960 961 if (priocntl(P_LWPID, P_MYID, PC_SETPARMS, 962 (caddr_t)&pcp) == -1) { 963 warn("failed to set RT parameters"); 964 Oflag = 0; 965 } 966 } else { 967 warn("failed to get RT class id"); 968 Oflag = 0; 969 } 970 971 if (mlockall(MCL_CURRENT | MCL_FUTURE) == -1) { 972 warn("failed to lock address space"); 973 Oflag = 0; 974 } 975 976 if (Oflag) 977 mdb_printf("%s: oink, oink!\n", mdb.m_pname); 978 } 979 980 /* 981 * Path evaluation part 2: Re-evaluate the path now that the target 982 * is ready (and thus we have access to the real platform string). 983 * Do this before reading ~/.mdbrc to allow path modifications prior 984 * to performing module auto-loading. 985 */ 986 mdb_set_ipath(mdb.m_ipathstr); 987 mdb_set_lpath(mdb.m_lpathstr); 988 989 if (!Sflag && (p = getenv("HOME")) != NULL) { 990 char rcpath[MAXPATHLEN]; 991 mdb_io_t *rc_io; 992 int fd; 993 994 (void) mdb_iob_snprintf(rcpath, MAXPATHLEN, "%s/.mdbrc", p); 995 fd = open64(rcpath, O_RDONLY); 996 997 if (fd >= 0 && (rc_io = mdb_fdio_create_named(fd, rcpath))) { 998 mdb_iob_t *iob = mdb_iob_create(rc_io, MDB_IOB_RDONLY); 999 mdb_iob_t *old = mdb.m_in; 1000 1001 mdb.m_in = iob; 1002 (void) mdb_run(); 1003 mdb.m_in = old; 1004 } 1005 } 1006 1007 if (!(mdb.m_flags & MDB_FL_NOMODS)) 1008 mdb_module_load_all(0); 1009 1010 (void) mdb_signal_sethandler(SIGINT, int_handler, NULL); 1011 while ((status = mdb_run()) == MDB_ERR_ABORT || 1012 status == MDB_ERR_OUTPUT) { 1013 /* 1014 * If a write failed on stdout, give up. A more informative 1015 * error message will already have been printed by mdb_run(). 1016 */ 1017 if (status == MDB_ERR_OUTPUT && 1018 mdb_iob_getflags(mdb.m_out) & MDB_IOB_ERR) { 1019 mdb_warn("write to stdout failed, exiting\n"); 1020 break; 1021 } 1022 continue; 1023 } 1024 1025 terminate((status == MDB_ERR_QUIT || status == 0) ? 0 : 1); 1026 /*NOTREACHED*/ 1027 return (0); 1028 1029 reexec: 1030 if ((p = strrchr(execname, '/')) == NULL) 1031 die("cannot determine absolute pathname\n"); 1032 #ifdef _LP64 1033 #ifdef __sparc 1034 (void) strcpy(p, "/../sparcv7/"); 1035 #else 1036 (void) strcpy(p, "/../i86/"); 1037 #endif 1038 #else 1039 #ifdef __sparc 1040 (void) strcpy(p, "/../sparcv9/"); 1041 #else 1042 (void) strcpy(p, "/../amd64/"); 1043 #endif 1044 #endif 1045 (void) strcat(p, mdb.m_pname); 1046 1047 if (mdb.m_term != NULL) 1048 (void) IOP_CTL(in_io, TCSETSW, &tios); 1049 1050 (void) putenv("_MDB_EXEC=1"); 1051 (void) execv(execname, argv); 1052 1053 /* 1054 * If execv fails, suppress ENOEXEC. Experience shows the most common 1055 * reason is that the machine is booted under a 32-bit kernel, in which 1056 * case it is clearer to only print the message below. 1057 */ 1058 if (errno != ENOEXEC) 1059 warn("failed to exec %s", execname); 1060 #ifdef _LP64 1061 die("64-bit %s cannot debug 32-bit program %s\n", 1062 mdb.m_pname, tgt_argv[0] ? 1063 tgt_argv[0] : tgt_argv[1]); 1064 #else 1065 die("32-bit %s cannot debug 64-bit program %s\n", 1066 mdb.m_pname, tgt_argv[0] ? 1067 tgt_argv[0] : tgt_argv[1]); 1068 #endif 1069 1070 goto tcreate; 1071 } 1072