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 /* 23 * Copyright 2010 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 /* 27 * Copyright 2015 Joyent, Inc. 28 * Copyright (c) 2014 by Delphix. All rights reserved. 29 */ 30 31 /* 32 * User Process Target 33 * 34 * The user process target is invoked when the -u or -p command-line options 35 * are used, or when an ELF executable file or ELF core file is specified on 36 * the command-line. This target is also selected by default when no target 37 * options are present. In this case, it defaults the executable name to 38 * "a.out". If no process or core file is currently attached, the target 39 * functions as a kind of virtual /dev/zero (in accordance with adb(1) 40 * semantics); reads from the virtual address space return zeroes and writes 41 * fail silently. The proc target itself is designed as a wrapper around the 42 * services provided by libproc.so: t->t_pshandle is set to the struct 43 * ps_prochandle pointer returned as a handle by libproc. The target also 44 * opens the executable file itself using the MDB GElf services, for 45 * interpreting the .symtab and .dynsym if no libproc handle has been 46 * initialized, and for handling i/o to and from the object file. Currently, 47 * the only ISA-dependent portions of the proc target are the $r and ::fpregs 48 * dcmds, the callbacks for t_next() and t_step_out(), and the list of named 49 * registers; these are linked in from the proc_isadep.c file for each ISA and 50 * called from the common code in this file. 51 * 52 * The user process target implements complete user process control using the 53 * facilities provided by libproc.so. The MDB execution control model and 54 * an overview of software event management is described in mdb_target.c. The 55 * proc target implements breakpoints by replacing the instruction of interest 56 * with a trap instruction, and then restoring the original instruction to step 57 * over the breakpoint. The idea of replacing program text with instructions 58 * that transfer control to the debugger dates back as far as 1951 [1]. When 59 * the target stops, we replace each breakpoint with the original instruction 60 * as part of the disarm operation. This means that no special processing is 61 * required for t_vread() because the instrumented instructions will never be 62 * seen by the debugger once the target stops. Some debuggers have improved 63 * start/stop performance by leaving breakpoint traps in place and then 64 * handling a read from a breakpoint address as a special case. Although this 65 * improves efficiency for a source-level debugger, it runs somewhat contrary 66 * to the philosophy of the low-level debugger. Since we remove the 67 * instructions, users can apply other external debugging tools to the process 68 * once it has stopped (e.g. the proc(1) tools) and not be misled by MDB 69 * instrumentation. The tracing of faults, signals, system calls, and 70 * watchpoints and general process inspection is implemented directly using 71 * the mechanisms provided by /proc, as described originally in [2] and [3]. 72 * 73 * References 74 * 75 * [1] S. Gill, "The Diagnosis Of Mistakes In Programmes on the EDSAC", 76 * Proceedings of the Royal Society Series A Mathematical and Physical 77 * Sciences, Cambridge University Press, 206(1087), May 1951, pp. 538-554. 78 * 79 * [2] T.J. Killian, "Processes as Files", Proceedings of the USENIX Association 80 * Summer Conference, Salt Lake City, June 1984, pp. 203-207. 81 * 82 * [3] Roger Faulkner and Ron Gomes, "The Process File System and Process 83 * Model in UNIX System V", Proceedings of the USENIX Association 84 * Winter Conference, Dallas, January 1991, pp. 243-252. 85 */ 86 87 #include <mdb/mdb_proc.h> 88 #include <mdb/mdb_disasm.h> 89 #include <mdb/mdb_signal.h> 90 #include <mdb/mdb_string.h> 91 #include <mdb/mdb_module.h> 92 #include <mdb/mdb_debug.h> 93 #include <mdb/mdb_conf.h> 94 #include <mdb/mdb_err.h> 95 #include <mdb/mdb_types.h> 96 #include <mdb/mdb.h> 97 98 #include <sys/utsname.h> 99 #include <sys/wait.h> 100 #include <sys/stat.h> 101 #include <termio.h> 102 #include <signal.h> 103 #include <stdio_ext.h> 104 #include <stdlib.h> 105 #include <string.h> 106 107 #define PC_FAKE -1UL /* illegal pc value unequal 0 */ 108 #define PANIC_BUFSIZE 1024 109 110 static const char PT_EXEC_PATH[] = "a.out"; /* Default executable */ 111 static const char PT_CORE_PATH[] = "core"; /* Default core file */ 112 113 static const pt_ptl_ops_t proc_lwp_ops; 114 static const pt_ptl_ops_t proc_tdb_ops; 115 static const mdb_se_ops_t proc_brkpt_ops; 116 static const mdb_se_ops_t proc_wapt_ops; 117 118 static int pt_setrun(mdb_tgt_t *, mdb_tgt_status_t *, int); 119 static void pt_activate_common(mdb_tgt_t *); 120 static mdb_tgt_vespec_f pt_ignore_sig; 121 static mdb_tgt_se_f pt_fork; 122 static mdb_tgt_se_f pt_exec; 123 124 static int pt_lookup_by_name_thr(mdb_tgt_t *, const char *, 125 const char *, GElf_Sym *, mdb_syminfo_t *, mdb_tgt_tid_t); 126 static int tlsbase(mdb_tgt_t *, mdb_tgt_tid_t, Lmid_t, const char *, 127 psaddr_t *); 128 129 /* 130 * When debugging postmortem, we don't resolve names as we may very well not 131 * be on a system on which those names resolve. 132 */ 133 #define PT_LIBPROC_RESOLVE(P) \ 134 (!(mdb.m_flags & MDB_FL_LMRAW) && Pstate(P) != PS_DEAD) 135 136 /* 137 * The Perror_printf() function interposes on the default, empty libproc 138 * definition. It will be called to report additional information on complex 139 * errors, such as a corrupt core file. We just pass the args to vwarn. 140 */ 141 /*ARGSUSED*/ 142 void 143 Perror_printf(struct ps_prochandle *P, const char *format, ...) 144 { 145 va_list alist; 146 147 va_start(alist, format); 148 vwarn(format, alist); 149 va_end(alist); 150 } 151 152 /* 153 * Open the specified i/o backend as the a.out executable file, and attempt to 154 * load its standard and dynamic symbol tables. Note that if mdb_gelf_create 155 * succeeds, io is assigned to p_fio and is automatically held by gelf_create. 156 */ 157 static mdb_gelf_file_t * 158 pt_open_aout(mdb_tgt_t *t, mdb_io_t *io) 159 { 160 pt_data_t *pt = t->t_data; 161 GElf_Sym s1, s2; 162 163 if ((pt->p_file = mdb_gelf_create(io, ET_NONE, GF_FILE)) == NULL) 164 return (NULL); 165 166 pt->p_symtab = mdb_gelf_symtab_create_file(pt->p_file, 167 SHT_SYMTAB, MDB_TGT_SYMTAB); 168 pt->p_dynsym = mdb_gelf_symtab_create_file(pt->p_file, 169 SHT_DYNSYM, MDB_TGT_DYNSYM); 170 171 /* 172 * If we've got an _start symbol with a zero size, prime the private 173 * symbol table with a copy of _start with its size set to the distance 174 * between _mcount and _start. We do this because DevPro has shipped 175 * the Intel crt1.o without proper .size directives for years, which 176 * precludes proper identification of _start in stack traces. 177 */ 178 if (mdb_gelf_symtab_lookup_by_name(pt->p_dynsym, "_start", &s1, 179 NULL) == 0 && s1.st_size == 0 && 180 GELF_ST_TYPE(s1.st_info) == STT_FUNC) { 181 if (mdb_gelf_symtab_lookup_by_name(pt->p_dynsym, "_mcount", 182 &s2, NULL) == 0 && GELF_ST_TYPE(s2.st_info) == STT_FUNC) { 183 s1.st_size = s2.st_value - s1.st_value; 184 mdb_gelf_symtab_insert(mdb.m_prsym, "_start", &s1); 185 } 186 } 187 188 pt->p_fio = io; 189 return (pt->p_file); 190 } 191 192 /* 193 * Destroy the symbol tables and GElf file object associated with p_fio. Note 194 * that we do not need to explicitly free p_fio: its reference count is 195 * automatically decremented by mdb_gelf_destroy, which will free it if needed. 196 */ 197 static void 198 pt_close_aout(mdb_tgt_t *t) 199 { 200 pt_data_t *pt = t->t_data; 201 202 if (pt->p_symtab != NULL) { 203 mdb_gelf_symtab_destroy(pt->p_symtab); 204 pt->p_symtab = NULL; 205 } 206 207 if (pt->p_dynsym != NULL) { 208 mdb_gelf_symtab_destroy(pt->p_dynsym); 209 pt->p_dynsym = NULL; 210 } 211 212 if (pt->p_file != NULL) { 213 mdb_gelf_destroy(pt->p_file); 214 pt->p_file = NULL; 215 } 216 217 mdb_gelf_symtab_delete(mdb.m_prsym, "_start", NULL); 218 pt->p_fio = NULL; 219 } 220 221 typedef struct tdb_mapping { 222 const char *tm_thr_lib; 223 const char *tm_db_dir; 224 const char *tm_db_name; 225 } tdb_mapping_t; 226 227 static const tdb_mapping_t tdb_map[] = { 228 { "/lwp/amd64/libthread.so", "/usr/lib/lwp/", "libthread_db.so" }, 229 { "/lwp/sparcv9/libthread.so", "/usr/lib/lwp/", "libthread_db.so" }, 230 { "/lwp/libthread.so", "/usr/lib/lwp/", "libthread_db.so" }, 231 { "/libthread.so", "/lib/", "libthread_db.so" }, 232 { "/libc_hwcap", "/lib/", "libc_db.so" }, 233 { "/libc.so", "/lib/", "libc_db.so" } 234 }; 235 236 /* 237 * Pobject_iter callback that we use to search for the presence of libthread in 238 * order to load the corresponding libthread_db support. We derive the 239 * libthread_db path dynamically based on the libthread path. If libthread is 240 * found, this function returns 1 (and thus Pobject_iter aborts and returns 1) 241 * regardless of whether it was successful in loading the libthread_db support. 242 * If we iterate over all objects and no libthread is found, 0 is returned. 243 * Since libthread_db support was then merged into libc_db, we load either 244 * libc_db or libthread_db, depending on which library we see first. 245 */ 246 /*ARGSUSED*/ 247 static int 248 thr_check(mdb_tgt_t *t, const prmap_t *pmp, const char *name) 249 { 250 pt_data_t *pt = t->t_data; 251 const mdb_tdb_ops_t *ops; 252 char *p; 253 254 char path[MAXPATHLEN]; 255 256 int libn; 257 258 if (name == NULL) 259 return (0); /* no rtld_db object name; keep going */ 260 261 for (libn = 0; libn < sizeof (tdb_map) / sizeof (tdb_map[0]); libn++) { 262 if ((p = strstr(name, tdb_map[libn].tm_thr_lib)) != NULL) 263 break; 264 } 265 266 if (p == NULL) 267 return (0); /* no match; keep going */ 268 269 path[0] = '\0'; 270 (void) strlcat(path, mdb.m_root, sizeof (path)); 271 (void) strlcat(path, tdb_map[libn].tm_db_dir, sizeof (path)); 272 #if !defined(_ILP32) 273 (void) strlcat(path, "64/", sizeof (path)); 274 #endif /* !_ILP32 */ 275 (void) strlcat(path, tdb_map[libn].tm_db_name, sizeof (path)); 276 277 /* Append the trailing library version number. */ 278 (void) strlcat(path, strrchr(name, '.'), sizeof (path)); 279 280 if ((ops = mdb_tdb_load(path)) == NULL) { 281 if (libn != 0 || errno != ENOENT) 282 warn("failed to load %s", path); 283 goto err; 284 } 285 286 if (ops == pt->p_tdb_ops) 287 return (1); /* no changes needed */ 288 289 PTL_DTOR(t); 290 pt->p_tdb_ops = ops; 291 pt->p_ptl_ops = &proc_tdb_ops; 292 pt->p_ptl_hdl = NULL; 293 294 if (PTL_CTOR(t) == -1) { 295 warn("failed to initialize %s", path); 296 goto err; 297 } 298 299 mdb_dprintf(MDB_DBG_TGT, "loaded %s for debugging %s\n", path, name); 300 (void) mdb_tgt_status(t, &t->t_status); 301 return (1); 302 err: 303 PTL_DTOR(t); 304 pt->p_tdb_ops = NULL; 305 pt->p_ptl_ops = &proc_lwp_ops; 306 pt->p_ptl_hdl = NULL; 307 308 if (libn != 0 || errno != ENOENT) { 309 warn("warning: debugger will only be able to " 310 "examine raw LWPs\n"); 311 } 312 313 (void) mdb_tgt_status(t, &t->t_status); 314 return (1); 315 } 316 317 /* 318 * Whenever the link map is consistent following an add or delete event, we ask 319 * libproc to update its mappings, check to see if we need to load libthread_db, 320 * and then update breakpoints which have been mapped or unmapped. 321 */ 322 /*ARGSUSED*/ 323 static void 324 pt_rtld_event(mdb_tgt_t *t, int vid, void *private) 325 { 326 struct ps_prochandle *P = t->t_pshandle; 327 pt_data_t *pt = t->t_data; 328 rd_event_msg_t rdm; 329 int docontinue = 1; 330 331 if (rd_event_getmsg(pt->p_rtld, &rdm) == RD_OK) { 332 333 mdb_dprintf(MDB_DBG_TGT, "rtld event type 0x%x state 0x%x\n", 334 rdm.type, rdm.u.state); 335 336 if (rdm.type == RD_DLACTIVITY && rdm.u.state == RD_CONSISTENT) { 337 mdb_sespec_t *sep, *nsep = mdb_list_next(&t->t_active); 338 pt_brkpt_t *ptb; 339 340 Pupdate_maps(P); 341 342 if (Pobject_iter(P, (proc_map_f *)thr_check, t) == 0 && 343 pt->p_ptl_ops != &proc_lwp_ops) { 344 mdb_dprintf(MDB_DBG_TGT, "unloading thread_db " 345 "support after dlclose\n"); 346 PTL_DTOR(t); 347 pt->p_tdb_ops = NULL; 348 pt->p_ptl_ops = &proc_lwp_ops; 349 pt->p_ptl_hdl = NULL; 350 (void) mdb_tgt_status(t, &t->t_status); 351 } 352 353 for (sep = nsep; sep != NULL; sep = nsep) { 354 nsep = mdb_list_next(sep); 355 ptb = sep->se_data; 356 357 if (sep->se_ops == &proc_brkpt_ops && 358 Paddr_to_map(P, ptb->ptb_addr) == NULL) 359 mdb_tgt_sespec_idle_one(t, sep, 360 EMDB_NOMAP); 361 } 362 363 if (!mdb_tgt_sespec_activate_all(t) && 364 (mdb.m_flags & MDB_FL_BPTNOSYMSTOP) && 365 pt->p_rtld_finished) { 366 /* 367 * We weren't able to activate the breakpoints. 368 * If so requested, we'll return without 369 * calling continue, thus throwing the user into 370 * the debugger. 371 */ 372 docontinue = 0; 373 } 374 375 if (pt->p_rdstate == PT_RD_ADD) 376 pt->p_rdstate = PT_RD_CONSIST; 377 } 378 379 if (rdm.type == RD_PREINIT) 380 (void) mdb_tgt_sespec_activate_all(t); 381 382 if (rdm.type == RD_POSTINIT) { 383 pt->p_rtld_finished = TRUE; 384 if (!mdb_tgt_sespec_activate_all(t) && 385 (mdb.m_flags & MDB_FL_BPTNOSYMSTOP)) { 386 /* 387 * Now that rtld has been initialized, we 388 * should be able to initialize all deferred 389 * breakpoints. If we can't, don't let the 390 * target continue. 391 */ 392 docontinue = 0; 393 } 394 } 395 396 if (rdm.type == RD_DLACTIVITY && rdm.u.state == RD_ADD && 397 pt->p_rtld_finished) 398 pt->p_rdstate = MAX(pt->p_rdstate, PT_RD_ADD); 399 } 400 401 if (docontinue) 402 (void) mdb_tgt_continue(t, NULL); 403 } 404 405 static void 406 pt_post_attach(mdb_tgt_t *t) 407 { 408 struct ps_prochandle *P = t->t_pshandle; 409 const lwpstatus_t *psp = &Pstatus(P)->pr_lwp; 410 pt_data_t *pt = t->t_data; 411 int hflag = MDB_TGT_SPEC_HIDDEN; 412 413 mdb_dprintf(MDB_DBG_TGT, "attach pr_flags=0x%x pr_why=%d pr_what=%d\n", 414 psp->pr_flags, psp->pr_why, psp->pr_what); 415 416 /* 417 * When we grab a process, the initial setting of p_rtld_finished 418 * should be false if the process was just created by exec; otherwise 419 * we permit unscoped references to resolve because we do not know how 420 * far the process has proceeded through linker initialization. 421 */ 422 if ((psp->pr_flags & PR_ISTOP) && psp->pr_why == PR_SYSEXIT && 423 psp->pr_errno == 0 && psp->pr_what == SYS_execve) { 424 if (mdb.m_target == NULL) { 425 warn("target performed exec of %s\n", 426 IOP_NAME(pt->p_fio)); 427 } 428 pt->p_rtld_finished = FALSE; 429 } else 430 pt->p_rtld_finished = TRUE; 431 432 /* 433 * When we grab a process, if it is stopped by job control and part of 434 * the same session (i.e. same controlling tty), set MDB_FL_JOBCTL so 435 * we will know to bring it to the foreground when we continue it. 436 */ 437 if (mdb.m_term != NULL && (psp->pr_flags & PR_STOPPED) && 438 psp->pr_why == PR_JOBCONTROL && getsid(0) == Pstatus(P)->pr_sid) 439 mdb.m_flags |= MDB_FL_JOBCTL; 440 441 /* 442 * When we grab control of a live process, set F_RDWR so that the 443 * target layer permits writes to the target's address space. 444 */ 445 t->t_flags |= MDB_TGT_F_RDWR; 446 447 (void) Pfault(P, FLTBPT, TRUE); /* always trace breakpoints */ 448 (void) Pfault(P, FLTWATCH, TRUE); /* always trace watchpoints */ 449 (void) Pfault(P, FLTTRACE, TRUE); /* always trace single-step */ 450 451 (void) Punsetflags(P, PR_ASYNC); /* require synchronous mode */ 452 (void) Psetflags(P, PR_BPTADJ); /* always adjust eip on x86 */ 453 (void) Psetflags(P, PR_FORK); /* inherit tracing on fork */ 454 455 /* 456 * Install event specifiers to track fork and exec activities: 457 */ 458 (void) mdb_tgt_add_sysexit(t, SYS_vfork, hflag, pt_fork, NULL); 459 (void) mdb_tgt_add_sysexit(t, SYS_forksys, hflag, pt_fork, NULL); 460 (void) mdb_tgt_add_sysexit(t, SYS_execve, hflag, pt_exec, NULL); 461 462 /* 463 * Attempt to instantiate the librtld_db agent and set breakpoints 464 * to track rtld activity. We will legitimately fail to instantiate 465 * the rtld_db agent if the target is statically linked. 466 */ 467 if (pt->p_rtld == NULL && (pt->p_rtld = Prd_agent(P)) != NULL) { 468 rd_notify_t rdn; 469 rd_err_e err; 470 471 if ((err = rd_event_enable(pt->p_rtld, TRUE)) != RD_OK) { 472 warn("failed to enable rtld_db event tracing: %s\n", 473 rd_errstr(err)); 474 goto out; 475 } 476 477 if ((err = rd_event_addr(pt->p_rtld, RD_PREINIT, 478 &rdn)) == RD_OK && rdn.type == RD_NOTIFY_BPT) { 479 (void) mdb_tgt_add_vbrkpt(t, rdn.u.bptaddr, 480 hflag, pt_rtld_event, NULL); 481 } else { 482 warn("failed to install rtld_db preinit tracing: %s\n", 483 rd_errstr(err)); 484 } 485 486 if ((err = rd_event_addr(pt->p_rtld, RD_POSTINIT, 487 &rdn)) == RD_OK && rdn.type == RD_NOTIFY_BPT) { 488 (void) mdb_tgt_add_vbrkpt(t, rdn.u.bptaddr, 489 hflag, pt_rtld_event, NULL); 490 } else { 491 warn("failed to install rtld_db postinit tracing: %s\n", 492 rd_errstr(err)); 493 } 494 495 if ((err = rd_event_addr(pt->p_rtld, RD_DLACTIVITY, 496 &rdn)) == RD_OK && rdn.type == RD_NOTIFY_BPT) { 497 (void) mdb_tgt_add_vbrkpt(t, rdn.u.bptaddr, 498 hflag, pt_rtld_event, NULL); 499 } else { 500 warn("failed to install rtld_db activity tracing: %s\n", 501 rd_errstr(err)); 502 } 503 } 504 out: 505 Pupdate_maps(P); 506 Psync(P); 507 508 /* 509 * If librtld_db failed to initialize due to an error or because we are 510 * debugging a statically linked executable, allow unscoped references. 511 */ 512 if (pt->p_rtld == NULL) 513 pt->p_rtld_finished = TRUE; 514 515 (void) mdb_tgt_sespec_activate_all(t); 516 } 517 518 /*ARGSUSED*/ 519 static int 520 pt_vespec_delete(mdb_tgt_t *t, void *private, int id, void *data) 521 { 522 if (id < 0) { 523 ASSERT(data == NULL); /* we don't use any ve_data */ 524 (void) mdb_tgt_vespec_delete(t, id); 525 } 526 return (0); 527 } 528 529 static void 530 pt_pre_detach(mdb_tgt_t *t, int clear_matched) 531 { 532 const lwpstatus_t *psp = &Pstatus(t->t_pshandle)->pr_lwp; 533 pt_data_t *pt = t->t_data; 534 long cmd = 0; 535 536 /* 537 * If we are about to release the process and it is stopped on a traced 538 * SIGINT, breakpoint fault, single-step fault, or watchpoint, make 539 * sure to clear this event prior to releasing the process so that it 540 * does not subsequently reissue the fault and die from SIGTRAP. 541 */ 542 if (psp->pr_flags & PR_ISTOP) { 543 if (psp->pr_why == PR_FAULTED && (psp->pr_what == FLTBPT || 544 psp->pr_what == FLTTRACE || psp->pr_what == FLTWATCH)) 545 cmd = PCCFAULT; 546 else if (psp->pr_why == PR_SIGNALLED && psp->pr_what == SIGINT) 547 cmd = PCCSIG; 548 549 if (cmd != 0) 550 (void) write(Pctlfd(t->t_pshandle), &cmd, sizeof (cmd)); 551 } 552 553 if (Pstate(t->t_pshandle) == PS_UNDEAD) 554 (void) waitpid(Pstatus(t->t_pshandle)->pr_pid, NULL, WNOHANG); 555 556 (void) mdb_tgt_vespec_iter(t, pt_vespec_delete, NULL); 557 mdb_tgt_sespec_idle_all(t, EMDB_NOPROC, clear_matched); 558 559 if (pt->p_fio != pt->p_aout_fio) { 560 pt_close_aout(t); 561 (void) pt_open_aout(t, pt->p_aout_fio); 562 } 563 564 PTL_DTOR(t); 565 pt->p_tdb_ops = NULL; 566 pt->p_ptl_ops = &proc_lwp_ops; 567 pt->p_ptl_hdl = NULL; 568 569 pt->p_rtld = NULL; 570 pt->p_signal = 0; 571 pt->p_rtld_finished = FALSE; 572 pt->p_rdstate = PT_RD_NONE; 573 } 574 575 static void 576 pt_release_parents(mdb_tgt_t *t) 577 { 578 struct ps_prochandle *P = t->t_pshandle; 579 pt_data_t *pt = t->t_data; 580 581 mdb_sespec_t *sep; 582 pt_vforkp_t *vfp; 583 584 while ((vfp = mdb_list_next(&pt->p_vforkp)) != NULL) { 585 mdb_dprintf(MDB_DBG_TGT, "releasing vfork parent %d\n", 586 (int)Pstatus(vfp->p_pshandle)->pr_pid); 587 588 /* 589 * To release vfork parents, we must also wipe out any armed 590 * events in the parent by switching t_pshandle and calling 591 * se_disarm(). Do not change states or lose the matched list. 592 */ 593 t->t_pshandle = vfp->p_pshandle; 594 595 for (sep = mdb_list_next(&t->t_active); sep != NULL; 596 sep = mdb_list_next(sep)) { 597 if (sep->se_state == MDB_TGT_SPEC_ARMED) 598 (void) sep->se_ops->se_disarm(t, sep); 599 } 600 601 t->t_pshandle = P; 602 603 Prelease(vfp->p_pshandle, PRELEASE_CLEAR); 604 mdb_list_delete(&pt->p_vforkp, vfp); 605 mdb_free(vfp, sizeof (pt_vforkp_t)); 606 } 607 } 608 609 /*ARGSUSED*/ 610 static void 611 pt_fork(mdb_tgt_t *t, int vid, void *private) 612 { 613 struct ps_prochandle *P = t->t_pshandle; 614 const lwpstatus_t *psp = &Pstatus(P)->pr_lwp; 615 pt_data_t *pt = t->t_data; 616 mdb_sespec_t *sep; 617 618 int follow_parent = mdb.m_forkmode != MDB_FM_CHILD; 619 int is_vfork = (psp->pr_what == SYS_vfork || 620 (psp->pr_what == SYS_forksys && psp->pr_sysarg[0] == 2)); 621 622 struct ps_prochandle *C; 623 const lwpstatus_t *csp; 624 char sysname[32]; 625 int gcode; 626 char c; 627 628 mdb_dprintf(MDB_DBG_TGT, "parent %s: errno=%d rv1=%ld rv2=%ld\n", 629 proc_sysname(psp->pr_what, sysname, sizeof (sysname)), 630 psp->pr_errno, psp->pr_rval1, psp->pr_rval2); 631 632 if (psp->pr_errno != 0) { 633 (void) mdb_tgt_continue(t, NULL); 634 return; /* fork failed */ 635 } 636 637 /* 638 * If forkmode is ASK and stdout is a terminal, then ask the user to 639 * explicitly set the fork behavior for this particular fork. 640 */ 641 if (mdb.m_forkmode == MDB_FM_ASK && mdb.m_term != NULL) { 642 mdb_iob_printf(mdb.m_err, "%s: %s detected: follow (p)arent " 643 "or (c)hild? ", mdb.m_pname, sysname); 644 mdb_iob_flush(mdb.m_err); 645 646 while (IOP_READ(mdb.m_term, &c, sizeof (c)) == sizeof (c)) { 647 if (c == 'P' || c == 'p') { 648 mdb_iob_printf(mdb.m_err, "%c\n", c); 649 follow_parent = TRUE; 650 break; 651 } else if (c == 'C' || c == 'c') { 652 mdb_iob_printf(mdb.m_err, "%c\n", c); 653 follow_parent = FALSE; 654 break; 655 } 656 } 657 } 658 659 /* 660 * The parent is now stopped on exit from its fork call. We must now 661 * grab the child on its return from fork in order to manipulate it. 662 */ 663 if ((C = Pgrab(psp->pr_rval1, PGRAB_RETAIN, &gcode)) == NULL) { 664 warn("failed to grab forked child process %ld: %s\n", 665 psp->pr_rval1, Pgrab_error(gcode)); 666 return; /* just stop if we failed to grab the child */ 667 } 668 669 /* 670 * We may have grabbed the child and stopped it prematurely before it 671 * stopped on exit from fork. If so, wait up to 1 sec for it to settle. 672 */ 673 if (Pstatus(C)->pr_lwp.pr_why != PR_SYSEXIT) 674 (void) Pwait(C, MILLISEC); 675 676 csp = &Pstatus(C)->pr_lwp; 677 678 if (csp->pr_why != PR_SYSEXIT || 679 (csp->pr_what != SYS_vfork && csp->pr_what != SYS_forksys)) { 680 warn("forked child process %ld did not stop on exit from " 681 "fork as expected\n", psp->pr_rval1); 682 } 683 684 warn("target forked child process %ld (debugger following %s)\n", 685 psp->pr_rval1, follow_parent ? "parent" : "child"); 686 687 (void) Punsetflags(C, PR_ASYNC); /* require synchronous mode */ 688 (void) Psetflags(C, PR_BPTADJ); /* always adjust eip on x86 */ 689 (void) Prd_agent(C); /* initialize librtld_db */ 690 691 /* 692 * At the time pt_fork() is called, the target event engine has already 693 * disarmed the specifiers on the active list, clearing out events in 694 * the parent process. However, this means that events that change 695 * the address space (e.g. breakpoints) have not been effectively 696 * disarmed in the child since its address space reflects the state of 697 * the process at the time of fork when events were armed. We must 698 * therefore handle this as a special case and re-invoke the disarm 699 * callback of each active specifier to clean out the child process. 700 */ 701 if (!is_vfork) { 702 for (t->t_pshandle = C, sep = mdb_list_next(&t->t_active); 703 sep != NULL; sep = mdb_list_next(sep)) { 704 if (sep->se_state == MDB_TGT_SPEC_ACTIVE) 705 (void) sep->se_ops->se_disarm(t, sep); 706 } 707 708 t->t_pshandle = P; /* restore pshandle to parent */ 709 } 710 711 /* 712 * If we're following the parent process, we need to temporarily change 713 * t_pshandle to refer to the child handle C so that we can clear out 714 * all the events in the child prior to releasing it below. If we are 715 * tracing a vfork, we also need to explicitly wait for the child to 716 * exec, exit, or die before we can reset and continue the parent. We 717 * avoid having to deal with the vfork child forking again by clearing 718 * PR_FORK and setting PR_RLC; if it does fork it will effectively be 719 * released from our control and we will continue following the parent. 720 */ 721 if (follow_parent) { 722 if (is_vfork) { 723 mdb_tgt_status_t status; 724 725 ASSERT(psp->pr_flags & PR_VFORKP); 726 mdb_tgt_sespec_idle_all(t, EBUSY, FALSE); 727 t->t_pshandle = C; 728 729 (void) Psysexit(C, SYS_execve, TRUE); 730 731 (void) Punsetflags(C, PR_FORK | PR_KLC); 732 (void) Psetflags(C, PR_RLC); 733 734 do { 735 if (pt_setrun(t, &status, 0) == -1 || 736 status.st_state == MDB_TGT_UNDEAD || 737 status.st_state == MDB_TGT_LOST) 738 break; /* failure or process died */ 739 740 } while (csp->pr_why != PR_SYSEXIT || 741 csp->pr_errno != 0 || csp->pr_what != SYS_execve); 742 } else 743 t->t_pshandle = C; 744 } 745 746 /* 747 * If we are following the child, destroy any active libthread_db 748 * handle before we release the parent process. 749 */ 750 if (!follow_parent) { 751 PTL_DTOR(t); 752 pt->p_tdb_ops = NULL; 753 pt->p_ptl_ops = &proc_lwp_ops; 754 pt->p_ptl_hdl = NULL; 755 } 756 757 /* 758 * Idle all events to make sure the address space and tracing flags are 759 * restored, and then release the process we are not tracing. If we 760 * are following the child of a vfork, we push the parent's pshandle 761 * on to a list of vfork parents to be released when we exec or exit. 762 */ 763 if (is_vfork && !follow_parent) { 764 pt_vforkp_t *vfp = mdb_alloc(sizeof (pt_vforkp_t), UM_SLEEP); 765 766 ASSERT(psp->pr_flags & PR_VFORKP); 767 vfp->p_pshandle = P; 768 mdb_list_append(&pt->p_vforkp, vfp); 769 mdb_tgt_sespec_idle_all(t, EBUSY, FALSE); 770 771 } else { 772 mdb_tgt_sespec_idle_all(t, EBUSY, FALSE); 773 Prelease(t->t_pshandle, PRELEASE_CLEAR); 774 if (!follow_parent) 775 pt_release_parents(t); 776 } 777 778 /* 779 * Now that all the hard stuff is done, switch t_pshandle back to the 780 * process we are following and reset our events to the ACTIVE state. 781 * If we are following the child, reset the libthread_db handle as well 782 * as the rtld agent. 783 */ 784 if (follow_parent) 785 t->t_pshandle = P; 786 else { 787 t->t_pshandle = C; 788 pt->p_rtld = Prd_agent(C); 789 (void) Pobject_iter(t->t_pshandle, (proc_map_f *)thr_check, t); 790 } 791 792 (void) mdb_tgt_sespec_activate_all(t); 793 (void) mdb_tgt_continue(t, NULL); 794 } 795 796 /*ARGSUSED*/ 797 static void 798 pt_exec(mdb_tgt_t *t, int vid, void *private) 799 { 800 struct ps_prochandle *P = t->t_pshandle; 801 const pstatus_t *psp = Pstatus(P); 802 pt_data_t *pt = t->t_data; 803 int follow_exec = mdb.m_execmode == MDB_EM_FOLLOW; 804 pid_t pid = psp->pr_pid; 805 806 char execname[MAXPATHLEN]; 807 mdb_sespec_t *sep, *nsep; 808 mdb_io_t *io; 809 char c; 810 811 mdb_dprintf(MDB_DBG_TGT, "exit from %s: errno=%d\n", proc_sysname( 812 psp->pr_lwp.pr_what, execname, sizeof (execname)), 813 psp->pr_lwp.pr_errno); 814 815 if (psp->pr_lwp.pr_errno != 0) { 816 (void) mdb_tgt_continue(t, NULL); 817 return; /* exec failed */ 818 } 819 820 /* 821 * If execmode is ASK and stdout is a terminal, then ask the user to 822 * explicitly set the exec behavior for this particular exec. If 823 * Pstate() still shows PS_LOST, we are being called from pt_setrun() 824 * directly and therefore we must resume the terminal since it is still 825 * in the suspended state as far as tgt_continue() is concerned. 826 */ 827 if (mdb.m_execmode == MDB_EM_ASK && mdb.m_term != NULL) { 828 if (Pstate(P) == PS_LOST) 829 IOP_RESUME(mdb.m_term); 830 831 mdb_iob_printf(mdb.m_err, "%s: %s detected: (f)ollow new " 832 "program or (s)top? ", mdb.m_pname, execname); 833 mdb_iob_flush(mdb.m_err); 834 835 while (IOP_READ(mdb.m_term, &c, sizeof (c)) == sizeof (c)) { 836 if (c == 'F' || c == 'f') { 837 mdb_iob_printf(mdb.m_err, "%c\n", c); 838 follow_exec = TRUE; 839 break; 840 } else if (c == 'S' || c == 's') { 841 mdb_iob_printf(mdb.m_err, "%c\n", c); 842 follow_exec = FALSE; 843 break; 844 } 845 } 846 847 if (Pstate(P) == PS_LOST) 848 IOP_SUSPEND(mdb.m_term); 849 } 850 851 pt_release_parents(t); /* release any waiting vfork parents */ 852 pt_pre_detach(t, FALSE); /* remove our breakpoints and idle events */ 853 Preset_maps(P); /* libproc must delete mappings and symtabs */ 854 pt_close_aout(t); /* free pt symbol tables and GElf file data */ 855 856 /* 857 * If we lost control of the process across the exec and are not able 858 * to reopen it, we have no choice but to clear the matched event list 859 * and wait for the user to quit or otherwise release the process. 860 */ 861 if (Pstate(P) == PS_LOST && Preopen(P) == -1) { 862 int error = errno; 863 864 warn("lost control of PID %d due to exec of %s executable\n", 865 (int)pid, error == EOVERFLOW ? "64-bit" : "set-id"); 866 867 for (sep = t->t_matched; sep != T_SE_END; sep = nsep) { 868 nsep = sep->se_matched; 869 sep->se_matched = NULL; 870 mdb_tgt_sespec_rele(t, sep); 871 } 872 873 if (error != EOVERFLOW) 874 return; /* just stop if we exec'd a set-id executable */ 875 } 876 877 if (Pstate(P) != PS_LOST) { 878 if (Pexecname(P, execname, sizeof (execname)) == NULL) { 879 (void) mdb_iob_snprintf(execname, sizeof (execname), 880 "/proc/%d/object/a.out", (int)pid); 881 } 882 883 if (follow_exec == FALSE || psp->pr_dmodel == PR_MODEL_NATIVE) 884 warn("target performed exec of %s\n", execname); 885 886 io = mdb_fdio_create_path(NULL, execname, pt->p_oflags, 0); 887 if (io == NULL) { 888 warn("failed to open %s", execname); 889 warn("a.out symbol tables will not be available\n"); 890 } else if (pt_open_aout(t, io) == NULL) { 891 (void) mdb_dis_select(pt_disasm(NULL)); 892 mdb_io_destroy(io); 893 } else 894 (void) mdb_dis_select(pt_disasm(&pt->p_file->gf_ehdr)); 895 } 896 897 /* 898 * We reset our libthread_db state here, but deliberately do NOT call 899 * PTL_DTOR because we do not want to call libthread_db's td_ta_delete. 900 * This interface is hopelessly broken in that it writes to the process 901 * address space (which we do not want it to do after an exec) and it 902 * doesn't bother deallocating any of its storage anyway. 903 */ 904 pt->p_tdb_ops = NULL; 905 pt->p_ptl_ops = &proc_lwp_ops; 906 pt->p_ptl_hdl = NULL; 907 908 if (follow_exec && psp->pr_dmodel != PR_MODEL_NATIVE) { 909 const char *argv[3]; 910 char *state, *env; 911 char pidarg[16]; 912 size_t envlen; 913 914 if (realpath(getexecname(), execname) == NULL) { 915 warn("cannot follow PID %d -- failed to resolve " 916 "debugger pathname for re-exec", (int)pid); 917 return; 918 } 919 920 warn("restarting debugger to follow PID %d ...\n", (int)pid); 921 mdb_dprintf(MDB_DBG_TGT, "re-exec'ing %s\n", execname); 922 923 (void) mdb_snprintf(pidarg, sizeof (pidarg), "-p%d", (int)pid); 924 925 state = mdb_get_config(); 926 envlen = strlen(MDB_CONFIG_ENV_VAR) + 1 + strlen(state) + 1; 927 env = mdb_alloc(envlen, UM_SLEEP); 928 (void) snprintf(env, envlen, 929 "%s=%s", MDB_CONFIG_ENV_VAR, state); 930 931 (void) putenv(env); 932 933 argv[0] = mdb.m_pname; 934 argv[1] = pidarg; 935 argv[2] = NULL; 936 937 if (mdb.m_term != NULL) 938 IOP_SUSPEND(mdb.m_term); 939 940 Prelease(P, PRELEASE_CLEAR | PRELEASE_HANG); 941 (void) execv(execname, (char *const *)argv); 942 warn("failed to re-exec debugger"); 943 944 if (mdb.m_term != NULL) 945 IOP_RESUME(mdb.m_term); 946 947 t->t_pshandle = pt->p_idlehandle; 948 return; 949 } 950 951 pt_post_attach(t); /* install tracing flags and activate events */ 952 pt_activate_common(t); /* initialize librtld_db and libthread_db */ 953 954 if (psp->pr_dmodel != PR_MODEL_NATIVE && mdb.m_term != NULL) { 955 warn("loadable dcmds will not operate on non-native %d-bit " 956 "data model\n", psp->pr_dmodel == PR_MODEL_ILP32 ? 32 : 64); 957 warn("use ::release -a and then run mdb -p %d to restart " 958 "debugger\n", (int)pid); 959 } 960 961 if (follow_exec) 962 (void) mdb_tgt_continue(t, NULL); 963 } 964 965 static int 966 pt_setflags(mdb_tgt_t *t, int flags) 967 { 968 pt_data_t *pt = t->t_data; 969 970 if ((flags ^ t->t_flags) & MDB_TGT_F_RDWR) { 971 int mode = (flags & MDB_TGT_F_RDWR) ? O_RDWR : O_RDONLY; 972 mdb_io_t *io; 973 974 if (pt->p_fio == NULL) 975 return (set_errno(EMDB_NOEXEC)); 976 977 io = mdb_fdio_create_path(NULL, IOP_NAME(pt->p_fio), mode, 0); 978 979 if (io == NULL) 980 return (-1); /* errno is set for us */ 981 982 t->t_flags = (t->t_flags & ~MDB_TGT_F_RDWR) | 983 (flags & MDB_TGT_F_RDWR); 984 985 pt->p_fio = mdb_io_hold(io); 986 mdb_io_rele(pt->p_file->gf_io); 987 pt->p_file->gf_io = pt->p_fio; 988 } 989 990 if (flags & MDB_TGT_F_FORCE) { 991 t->t_flags |= MDB_TGT_F_FORCE; 992 pt->p_gflags |= PGRAB_FORCE; 993 } 994 995 return (0); 996 } 997 998 /*ARGSUSED*/ 999 static int 1000 pt_frame(void *arglim, uintptr_t pc, uint_t argc, const long *argv, 1001 const mdb_tgt_gregset_t *gregs) 1002 { 1003 argc = MIN(argc, (uint_t)(uintptr_t)arglim); 1004 mdb_printf("%a(", pc); 1005 1006 if (argc != 0) { 1007 mdb_printf("%lr", *argv++); 1008 for (argc--; argc != 0; argc--) 1009 mdb_printf(", %lr", *argv++); 1010 } 1011 1012 mdb_printf(")\n"); 1013 return (0); 1014 } 1015 1016 static int 1017 pt_framev(void *arglim, uintptr_t pc, uint_t argc, const long *argv, 1018 const mdb_tgt_gregset_t *gregs) 1019 { 1020 argc = MIN(argc, (uint_t)(uintptr_t)arglim); 1021 #if defined(__i386) || defined(__amd64) 1022 mdb_printf("%0?lr %a(", gregs->gregs[R_FP], pc); 1023 #else 1024 mdb_printf("%0?lr %a(", gregs->gregs[R_SP], pc); 1025 #endif 1026 if (argc != 0) { 1027 mdb_printf("%lr", *argv++); 1028 for (argc--; argc != 0; argc--) 1029 mdb_printf(", %lr", *argv++); 1030 } 1031 1032 mdb_printf(")\n"); 1033 return (0); 1034 } 1035 1036 static int 1037 pt_framer(void *arglim, uintptr_t pc, uint_t argc, const long *argv, 1038 const mdb_tgt_gregset_t *gregs) 1039 { 1040 if (pt_frameregs(arglim, pc, argc, argv, gregs, pc == PC_FAKE) == -1) { 1041 /* 1042 * Use verbose format if register format is not supported. 1043 */ 1044 return (pt_framev(arglim, pc, argc, argv, gregs)); 1045 } 1046 1047 return (0); 1048 } 1049 1050 /*ARGSUSED*/ 1051 static int 1052 pt_stack_common(uintptr_t addr, uint_t flags, int argc, 1053 const mdb_arg_t *argv, mdb_tgt_stack_f *func, prgreg_t saved_pc) 1054 { 1055 void *arg = (void *)(uintptr_t)mdb.m_nargs; 1056 mdb_tgt_t *t = mdb.m_target; 1057 mdb_tgt_gregset_t gregs; 1058 1059 if (argc != 0) { 1060 if (argv->a_type == MDB_TYPE_CHAR || argc > 1) 1061 return (DCMD_USAGE); 1062 1063 if (argv->a_type == MDB_TYPE_STRING) 1064 arg = (void *)(uintptr_t)mdb_strtoull(argv->a_un.a_str); 1065 else 1066 arg = (void *)(uintptr_t)argv->a_un.a_val; 1067 } 1068 1069 if (t->t_pshandle == NULL || Pstate(t->t_pshandle) == PS_IDLE) { 1070 mdb_warn("no process active\n"); 1071 return (DCMD_ERR); 1072 } 1073 1074 /* 1075 * In the universe of sparcv7, sparcv9, ia32, and amd64 this code can be 1076 * common: <sys/procfs_isa.h> conveniently #defines R_FP to be the 1077 * appropriate register we need to set in order to perform a stack 1078 * traceback from a given frame address. 1079 */ 1080 if (flags & DCMD_ADDRSPEC) { 1081 bzero(&gregs, sizeof (gregs)); 1082 gregs.gregs[R_FP] = addr; 1083 #ifdef __sparc 1084 gregs.gregs[R_I7] = saved_pc; 1085 #endif /* __sparc */ 1086 } else if (PTL_GETREGS(t, PTL_TID(t), gregs.gregs) != 0) { 1087 mdb_warn("failed to get current register set"); 1088 return (DCMD_ERR); 1089 } 1090 1091 (void) mdb_tgt_stack_iter(t, &gregs, func, arg); 1092 return (DCMD_OK); 1093 } 1094 1095 static int 1096 pt_stack(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv) 1097 { 1098 return (pt_stack_common(addr, flags, argc, argv, pt_frame, 0)); 1099 } 1100 1101 static int 1102 pt_stackv(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv) 1103 { 1104 return (pt_stack_common(addr, flags, argc, argv, pt_framev, 0)); 1105 } 1106 1107 static int 1108 pt_stackr(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv) 1109 { 1110 /* 1111 * Force printing of first register window, by setting the 1112 * saved pc (%i7) to PC_FAKE. 1113 */ 1114 return (pt_stack_common(addr, flags, argc, argv, pt_framer, PC_FAKE)); 1115 } 1116 1117 /*ARGSUSED*/ 1118 static int 1119 pt_ignored(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv) 1120 { 1121 struct ps_prochandle *P = mdb.m_target->t_pshandle; 1122 char buf[PRSIGBUFSZ]; 1123 1124 if ((flags & DCMD_ADDRSPEC) || argc != 0) 1125 return (DCMD_USAGE); 1126 1127 if (P == NULL) { 1128 mdb_warn("no process is currently active\n"); 1129 return (DCMD_ERR); 1130 } 1131 1132 mdb_printf("%s\n", proc_sigset2str(&Pstatus(P)->pr_sigtrace, " ", 1133 FALSE, buf, sizeof (buf))); 1134 1135 return (DCMD_OK); 1136 } 1137 1138 /*ARGSUSED*/ 1139 static int 1140 pt_lwpid(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv) 1141 { 1142 struct ps_prochandle *P = mdb.m_target->t_pshandle; 1143 1144 if ((flags & DCMD_ADDRSPEC) || argc != 0) 1145 return (DCMD_USAGE); 1146 1147 if (P == NULL) { 1148 mdb_warn("no process is currently active\n"); 1149 return (DCMD_ERR); 1150 } 1151 1152 mdb_printf("%d\n", Pstatus(P)->pr_lwp.pr_lwpid); 1153 return (DCMD_OK); 1154 } 1155 1156 static int 1157 pt_print_lwpid(int *n, const lwpstatus_t *psp) 1158 { 1159 struct ps_prochandle *P = mdb.m_target->t_pshandle; 1160 int nlwp = Pstatus(P)->pr_nlwp; 1161 1162 if (*n == nlwp - 2) 1163 mdb_printf("%d and ", (int)psp->pr_lwpid); 1164 else if (*n == nlwp - 1) 1165 mdb_printf("%d are", (int)psp->pr_lwpid); 1166 else 1167 mdb_printf("%d, ", (int)psp->pr_lwpid); 1168 1169 (*n)++; 1170 return (0); 1171 } 1172 1173 /*ARGSUSED*/ 1174 static int 1175 pt_lwpids(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv) 1176 { 1177 struct ps_prochandle *P = mdb.m_target->t_pshandle; 1178 int n = 0; 1179 1180 if (P == NULL) { 1181 mdb_warn("no process is currently active\n"); 1182 return (DCMD_ERR); 1183 } 1184 1185 switch (Pstatus(P)->pr_nlwp) { 1186 case 0: 1187 mdb_printf("no lwps are"); 1188 break; 1189 case 1: 1190 mdb_printf("lwpid %d is the only lwp", 1191 Pstatus(P)->pr_lwp.pr_lwpid); 1192 break; 1193 default: 1194 mdb_printf("lwpids "); 1195 (void) Plwp_iter(P, (proc_lwp_f *)pt_print_lwpid, &n); 1196 } 1197 1198 switch (Pstate(P)) { 1199 case PS_DEAD: 1200 mdb_printf(" in core of process %d.\n", Pstatus(P)->pr_pid); 1201 break; 1202 case PS_IDLE: 1203 mdb_printf(" in idle target.\n"); 1204 break; 1205 default: 1206 mdb_printf(" in process %d.\n", (int)Pstatus(P)->pr_pid); 1207 break; 1208 } 1209 1210 return (DCMD_OK); 1211 } 1212 1213 /*ARGSUSED*/ 1214 static int 1215 pt_ignore(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv) 1216 { 1217 pt_data_t *pt = mdb.m_target->t_data; 1218 1219 if (!(flags & DCMD_ADDRSPEC) || argc != 0) 1220 return (DCMD_USAGE); 1221 1222 if (addr < 1 || addr > pt->p_maxsig) { 1223 mdb_warn("invalid signal number -- 0t%lu\n", addr); 1224 return (DCMD_ERR); 1225 } 1226 1227 (void) mdb_tgt_vespec_iter(mdb.m_target, pt_ignore_sig, (void *)addr); 1228 return (DCMD_OK); 1229 } 1230 1231 /*ARGSUSED*/ 1232 static int 1233 pt_attach(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv) 1234 { 1235 mdb_tgt_t *t = mdb.m_target; 1236 pt_data_t *pt = t->t_data; 1237 int state, perr; 1238 1239 if (!(flags & DCMD_ADDRSPEC) && argc == 0) 1240 return (DCMD_USAGE); 1241 1242 if (((flags & DCMD_ADDRSPEC) && argc != 0) || argc > 1 || 1243 (argc != 0 && argv->a_type != MDB_TYPE_STRING)) 1244 return (DCMD_USAGE); 1245 1246 if (t->t_pshandle != NULL && Pstate(t->t_pshandle) != PS_IDLE) { 1247 mdb_warn("debugger is already attached to a %s\n", 1248 (Pstate(t->t_pshandle) == PS_DEAD) ? "core" : "process"); 1249 return (DCMD_ERR); 1250 } 1251 1252 if (pt->p_fio == NULL) { 1253 mdb_warn("attach requires executable to be specified on " 1254 "command-line (or use -p)\n"); 1255 return (DCMD_ERR); 1256 } 1257 1258 if (flags & DCMD_ADDRSPEC) 1259 t->t_pshandle = Pgrab((pid_t)addr, pt->p_gflags, &perr); 1260 else 1261 t->t_pshandle = proc_arg_grab(argv->a_un.a_str, 1262 PR_ARG_ANY, pt->p_gflags, &perr); 1263 1264 if (t->t_pshandle == NULL) { 1265 t->t_pshandle = pt->p_idlehandle; 1266 mdb_warn("cannot attach: %s\n", Pgrab_error(perr)); 1267 return (DCMD_ERR); 1268 } 1269 1270 state = Pstate(t->t_pshandle); 1271 if (state != PS_DEAD && state != PS_IDLE) { 1272 (void) Punsetflags(t->t_pshandle, PR_KLC); 1273 (void) Psetflags(t->t_pshandle, PR_RLC); 1274 pt_post_attach(t); 1275 pt_activate_common(t); 1276 } 1277 1278 (void) mdb_tgt_status(t, &t->t_status); 1279 mdb_module_load_all(0); 1280 return (DCMD_OK); 1281 } 1282 1283 static int 1284 pt_regstatus(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv) 1285 { 1286 mdb_tgt_t *t = mdb.m_target; 1287 1288 if (t->t_pshandle != NULL) { 1289 const pstatus_t *psp = Pstatus(t->t_pshandle); 1290 int cursig = psp->pr_lwp.pr_cursig; 1291 char signame[SIG2STR_MAX]; 1292 int state = Pstate(t->t_pshandle); 1293 1294 if (state != PS_DEAD && state != PS_IDLE) 1295 mdb_printf("process id = %d\n", psp->pr_pid); 1296 else 1297 mdb_printf("no process\n"); 1298 1299 if (cursig != 0 && sig2str(cursig, signame) == 0) 1300 mdb_printf("SIG%s: %s\n", signame, strsignal(cursig)); 1301 } 1302 1303 return (pt_regs(addr, flags, argc, argv)); 1304 } 1305 1306 static int 1307 pt_findstack(uintptr_t tid, uint_t flags, int argc, const mdb_arg_t *argv) 1308 { 1309 mdb_tgt_t *t = mdb.m_target; 1310 mdb_tgt_gregset_t gregs; 1311 int showargs = 0; 1312 int count; 1313 uintptr_t pc, sp; 1314 1315 if (!(flags & DCMD_ADDRSPEC)) 1316 return (DCMD_USAGE); 1317 1318 count = mdb_getopts(argc, argv, 'v', MDB_OPT_SETBITS, TRUE, &showargs, 1319 NULL); 1320 argc -= count; 1321 argv += count; 1322 1323 if (argc > 1 || (argc == 1 && argv->a_type != MDB_TYPE_STRING)) 1324 return (DCMD_USAGE); 1325 1326 if (PTL_GETREGS(t, tid, gregs.gregs) != 0) { 1327 mdb_warn("failed to get register set for thread %p", tid); 1328 return (DCMD_ERR); 1329 } 1330 1331 pc = gregs.gregs[R_PC]; 1332 #if defined(__i386) || defined(__amd64) 1333 sp = gregs.gregs[R_FP]; 1334 #else 1335 sp = gregs.gregs[R_SP]; 1336 #endif 1337 mdb_printf("stack pointer for thread %p: %p\n", tid, sp); 1338 if (pc != 0) 1339 mdb_printf("[ %0?lr %a() ]\n", sp, pc); 1340 1341 (void) mdb_inc_indent(2); 1342 mdb_set_dot(sp); 1343 1344 if (argc == 1) 1345 (void) mdb_eval(argv->a_un.a_str); 1346 else if (showargs) 1347 (void) mdb_eval("<.$C"); 1348 else 1349 (void) mdb_eval("<.$C0"); 1350 1351 (void) mdb_dec_indent(2); 1352 return (DCMD_OK); 1353 } 1354 1355 /*ARGSUSED*/ 1356 static int 1357 pt_gcore(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv) 1358 { 1359 mdb_tgt_t *t = mdb.m_target; 1360 char *prefix = "core"; 1361 char *content_str = NULL; 1362 core_content_t content = CC_CONTENT_DEFAULT; 1363 size_t size; 1364 char *fname; 1365 pid_t pid; 1366 1367 if (flags & DCMD_ADDRSPEC) 1368 return (DCMD_USAGE); 1369 1370 if (mdb_getopts(argc, argv, 1371 'o', MDB_OPT_STR, &prefix, 1372 'c', MDB_OPT_STR, &content_str, NULL) != argc) 1373 return (DCMD_USAGE); 1374 1375 if (content_str != NULL && 1376 (proc_str2content(content_str, &content) != 0 || 1377 content == CC_CONTENT_INVALID)) { 1378 mdb_warn("invalid content string '%s'\n", content_str); 1379 return (DCMD_ERR); 1380 } 1381 1382 if (t->t_pshandle == NULL) { 1383 mdb_warn("no process active\n"); 1384 return (DCMD_ERR); 1385 } 1386 1387 pid = Pstatus(t->t_pshandle)->pr_pid; 1388 size = 1 + mdb_snprintf(NULL, 0, "%s.%d", prefix, (int)pid); 1389 fname = mdb_alloc(size, UM_SLEEP | UM_GC); 1390 (void) mdb_snprintf(fname, size, "%s.%d", prefix, (int)pid); 1391 1392 if (Pgcore(t->t_pshandle, fname, content) != 0) { 1393 /* 1394 * Short writes during dumping are specifically described by 1395 * EBADE, just as ZFS uses this otherwise-unused code for 1396 * checksum errors. Translate to and mdb errno. 1397 */ 1398 if (errno == EBADE) 1399 (void) set_errno(EMDB_SHORTWRITE); 1400 mdb_warn("couldn't dump core"); 1401 return (DCMD_ERR); 1402 } 1403 1404 mdb_warn("%s dumped\n", fname); 1405 1406 return (DCMD_OK); 1407 } 1408 1409 /*ARGSUSED*/ 1410 static int 1411 pt_kill(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv) 1412 { 1413 mdb_tgt_t *t = mdb.m_target; 1414 pt_data_t *pt = t->t_data; 1415 int state; 1416 1417 if ((flags & DCMD_ADDRSPEC) || argc != 0) 1418 return (DCMD_USAGE); 1419 1420 if (t->t_pshandle != NULL && 1421 (state = Pstate(t->t_pshandle)) != PS_DEAD && state != PS_IDLE) { 1422 mdb_warn("victim process PID %d forcibly terminated\n", 1423 (int)Pstatus(t->t_pshandle)->pr_pid); 1424 pt_pre_detach(t, TRUE); 1425 pt_release_parents(t); 1426 Prelease(t->t_pshandle, PRELEASE_KILL); 1427 t->t_pshandle = pt->p_idlehandle; 1428 (void) mdb_tgt_status(t, &t->t_status); 1429 mdb.m_flags &= ~(MDB_FL_VCREATE | MDB_FL_JOBCTL); 1430 } else 1431 mdb_warn("no victim process is currently under control\n"); 1432 1433 return (DCMD_OK); 1434 } 1435 1436 /*ARGSUSED*/ 1437 static int 1438 pt_detach(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv) 1439 { 1440 mdb_tgt_t *t = mdb.m_target; 1441 pt_data_t *pt = t->t_data; 1442 int rflags = pt->p_rflags; 1443 1444 if (argc != 0 && argv->a_type == MDB_TYPE_STRING && 1445 strcmp(argv->a_un.a_str, "-a") == 0) { 1446 rflags = PRELEASE_HANG | PRELEASE_CLEAR; 1447 argv++; 1448 argc--; 1449 } 1450 1451 if ((flags & DCMD_ADDRSPEC) || argc != 0) 1452 return (DCMD_USAGE); 1453 1454 if (t->t_pshandle == NULL || Pstate(t->t_pshandle) == PS_IDLE) { 1455 mdb_warn("debugger is not currently attached to a process " 1456 "or core file\n"); 1457 return (DCMD_ERR); 1458 } 1459 1460 pt_pre_detach(t, TRUE); 1461 pt_release_parents(t); 1462 Prelease(t->t_pshandle, rflags); 1463 t->t_pshandle = pt->p_idlehandle; 1464 (void) mdb_tgt_status(t, &t->t_status); 1465 mdb.m_flags &= ~(MDB_FL_VCREATE | MDB_FL_JOBCTL); 1466 1467 return (DCMD_OK); 1468 } 1469 1470 static uintmax_t 1471 reg_disc_get(const mdb_var_t *v) 1472 { 1473 mdb_tgt_t *t = MDB_NV_COOKIE(v); 1474 mdb_tgt_tid_t tid = PTL_TID(t); 1475 mdb_tgt_reg_t r = 0; 1476 1477 if (tid != (mdb_tgt_tid_t)-1L) 1478 (void) mdb_tgt_getareg(t, tid, mdb_nv_get_name(v), &r); 1479 1480 return (r); 1481 } 1482 1483 static void 1484 reg_disc_set(mdb_var_t *v, uintmax_t r) 1485 { 1486 mdb_tgt_t *t = MDB_NV_COOKIE(v); 1487 mdb_tgt_tid_t tid = PTL_TID(t); 1488 1489 if (tid != (mdb_tgt_tid_t)-1L && mdb_tgt_putareg(t, tid, 1490 mdb_nv_get_name(v), r) == -1) 1491 mdb_warn("failed to modify %%%s register", mdb_nv_get_name(v)); 1492 } 1493 1494 static void 1495 pt_print_reason(const lwpstatus_t *psp) 1496 { 1497 char name[SIG2STR_MAX + 4]; /* enough for SIG+name+\0, syscall or flt */ 1498 const char *desc; 1499 1500 switch (psp->pr_why) { 1501 case PR_REQUESTED: 1502 mdb_printf("stopped by debugger"); 1503 break; 1504 case PR_SIGNALLED: 1505 mdb_printf("stopped on %s (%s)", proc_signame(psp->pr_what, 1506 name, sizeof (name)), strsignal(psp->pr_what)); 1507 break; 1508 case PR_SYSENTRY: 1509 mdb_printf("stopped on entry to %s system call", 1510 proc_sysname(psp->pr_what, name, sizeof (name))); 1511 break; 1512 case PR_SYSEXIT: 1513 mdb_printf("stopped on exit from %s system call", 1514 proc_sysname(psp->pr_what, name, sizeof (name))); 1515 break; 1516 case PR_JOBCONTROL: 1517 mdb_printf("stopped by job control"); 1518 break; 1519 case PR_FAULTED: 1520 if (psp->pr_what == FLTBPT) { 1521 mdb_printf("stopped on a breakpoint"); 1522 } else if (psp->pr_what == FLTWATCH) { 1523 switch (psp->pr_info.si_code) { 1524 case TRAP_RWATCH: 1525 desc = "read"; 1526 break; 1527 case TRAP_WWATCH: 1528 desc = "write"; 1529 break; 1530 case TRAP_XWATCH: 1531 desc = "execute"; 1532 break; 1533 default: 1534 desc = "unknown"; 1535 } 1536 mdb_printf("stopped %s a watchpoint (%s access to %p)", 1537 psp->pr_info.si_trapafter ? "after" : "on", 1538 desc, psp->pr_info.si_addr); 1539 } else if (psp->pr_what == FLTTRACE) { 1540 mdb_printf("stopped after a single-step"); 1541 } else { 1542 mdb_printf("stopped on a %s fault", 1543 proc_fltname(psp->pr_what, name, sizeof (name))); 1544 } 1545 break; 1546 case PR_SUSPENDED: 1547 case PR_CHECKPOINT: 1548 mdb_printf("suspended by the kernel"); 1549 break; 1550 default: 1551 mdb_printf("stopped for unknown reason (%d/%d)", 1552 psp->pr_why, psp->pr_what); 1553 } 1554 } 1555 1556 /*ARGSUSED*/ 1557 static int 1558 pt_status_dcmd(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv) 1559 { 1560 mdb_tgt_t *t = mdb.m_target; 1561 struct ps_prochandle *P = t->t_pshandle; 1562 pt_data_t *pt = t->t_data; 1563 1564 if (P != NULL) { 1565 const psinfo_t *pip = Ppsinfo(P); 1566 const pstatus_t *psp = Pstatus(P); 1567 int cursig = 0, bits = 0, coredump = 0; 1568 int state; 1569 GElf_Sym sym; 1570 uintptr_t panicstr; 1571 char *panicbuf = mdb_alloc(PANIC_BUFSIZE, UM_SLEEP); 1572 const siginfo_t *sip = &(psp->pr_lwp.pr_info); 1573 1574 char execname[MAXPATHLEN], buf[BUFSIZ]; 1575 char signame[SIG2STR_MAX + 4]; /* enough for SIG+name+\0 */ 1576 1577 mdb_tgt_spec_desc_t desc; 1578 mdb_sespec_t *sep; 1579 1580 struct utsname uts; 1581 prcred_t cred; 1582 psinfo_t pi; 1583 1584 (void) strcpy(uts.nodename, "unknown machine"); 1585 (void) Puname(P, &uts); 1586 1587 if (pip != NULL) { 1588 bcopy(pip, &pi, sizeof (psinfo_t)); 1589 proc_unctrl_psinfo(&pi); 1590 } else 1591 bzero(&pi, sizeof (psinfo_t)); 1592 1593 bits = pi.pr_dmodel == PR_MODEL_ILP32 ? 32 : 64; 1594 1595 state = Pstate(P); 1596 if (psp != NULL && state != PS_UNDEAD && state != PS_IDLE) 1597 cursig = psp->pr_lwp.pr_cursig; 1598 1599 if (state == PS_DEAD && pip != NULL) { 1600 mdb_printf("debugging core file of %s (%d-bit) " 1601 "from %s\n", pi.pr_fname, bits, uts.nodename); 1602 1603 } else if (state == PS_DEAD) { 1604 mdb_printf("debugging core file\n"); 1605 1606 } else if (state == PS_IDLE) { 1607 const GElf_Ehdr *ehp = &pt->p_file->gf_ehdr; 1608 1609 mdb_printf("debugging %s file (%d-bit)\n", 1610 ehp->e_type == ET_EXEC ? "executable" : "object", 1611 ehp->e_ident[EI_CLASS] == ELFCLASS32 ? 32 : 64); 1612 1613 } else if (state == PS_UNDEAD && pi.pr_pid == 0) { 1614 mdb_printf("debugging defunct process\n"); 1615 1616 } else { 1617 mdb_printf("debugging PID %d (%d-bit)\n", 1618 pi.pr_pid, bits); 1619 } 1620 1621 if (Pexecname(P, execname, sizeof (execname)) != NULL) 1622 mdb_printf("file: %s\n", execname); 1623 1624 if (pip != NULL && state == PS_DEAD) 1625 mdb_printf("initial argv: %s\n", pi.pr_psargs); 1626 1627 if (state != PS_UNDEAD && state != PS_IDLE) { 1628 mdb_printf("threading model: "); 1629 if (pt->p_ptl_ops == &proc_lwp_ops) 1630 mdb_printf("raw lwps\n"); 1631 else 1632 mdb_printf("native threads\n"); 1633 } 1634 1635 mdb_printf("status: "); 1636 switch (state) { 1637 case PS_RUN: 1638 ASSERT(!(psp->pr_flags & PR_STOPPED)); 1639 mdb_printf("process is running"); 1640 if (psp->pr_flags & PR_DSTOP) 1641 mdb_printf(", debugger stop directive pending"); 1642 mdb_printf("\n"); 1643 break; 1644 1645 case PS_STOP: 1646 ASSERT(psp->pr_flags & PR_STOPPED); 1647 pt_print_reason(&psp->pr_lwp); 1648 1649 if (psp->pr_flags & PR_DSTOP) 1650 mdb_printf(", debugger stop directive pending"); 1651 if (psp->pr_flags & PR_ASLEEP) 1652 mdb_printf(", sleeping in %s system call", 1653 proc_sysname(psp->pr_lwp.pr_syscall, 1654 signame, sizeof (signame))); 1655 1656 mdb_printf("\n"); 1657 1658 for (sep = t->t_matched; sep != T_SE_END; 1659 sep = sep->se_matched) { 1660 mdb_printf("event: %s\n", sep->se_ops->se_info( 1661 t, sep, mdb_list_next(&sep->se_velist), 1662 &desc, buf, sizeof (buf))); 1663 } 1664 break; 1665 1666 case PS_LOST: 1667 mdb_printf("debugger lost control of process\n"); 1668 break; 1669 1670 case PS_UNDEAD: 1671 coredump = WIFSIGNALED(pi.pr_wstat) && 1672 WCOREDUMP(pi.pr_wstat); 1673 /*FALLTHRU*/ 1674 1675 case PS_DEAD: 1676 if (cursig == 0 && WIFSIGNALED(pi.pr_wstat)) 1677 cursig = WTERMSIG(pi.pr_wstat); 1678 /* 1679 * We can only use pr_wstat == 0 as a test for gcore if 1680 * an NT_PRCRED note is present; these features were 1681 * added at the same time in Solaris 8. 1682 */ 1683 if (pi.pr_wstat == 0 && Pstate(P) == PS_DEAD && 1684 Pcred(P, &cred, 1) == 0) { 1685 mdb_printf("process core file generated " 1686 "with gcore(1)\n"); 1687 } else if (cursig != 0) { 1688 mdb_printf("process terminated by %s (%s)", 1689 proc_signame(cursig, signame, 1690 sizeof (signame)), strsignal(cursig)); 1691 1692 if (sip->si_signo != 0 && SI_FROMUSER(sip) && 1693 sip->si_pid != 0) { 1694 mdb_printf(", pid=%d uid=%u", 1695 (int)sip->si_pid, sip->si_uid); 1696 if (sip->si_code != 0) { 1697 mdb_printf(" code=%d", 1698 sip->si_code); 1699 } 1700 } else { 1701 switch (sip->si_signo) { 1702 case SIGILL: 1703 case SIGTRAP: 1704 case SIGFPE: 1705 case SIGSEGV: 1706 case SIGBUS: 1707 case SIGEMT: 1708 mdb_printf(", addr=%p", 1709 sip->si_addr); 1710 default: 1711 break; 1712 } 1713 } 1714 1715 if (coredump) 1716 mdb_printf(" - core file dumped"); 1717 mdb_printf("\n"); 1718 } else { 1719 mdb_printf("process terminated with exit " 1720 "status %d\n", WEXITSTATUS(pi.pr_wstat)); 1721 } 1722 1723 if (Plookup_by_name(t->t_pshandle, "libc.so", 1724 "panicstr", &sym) == 0 && 1725 Pread(t->t_pshandle, &panicstr, sizeof (panicstr), 1726 sym.st_value) == sizeof (panicstr) && 1727 Pread_string(t->t_pshandle, panicbuf, 1728 PANIC_BUFSIZE, panicstr) > 0) { 1729 mdb_printf("panic message: %s", 1730 panicbuf); 1731 } 1732 1733 1734 break; 1735 1736 case PS_IDLE: 1737 mdb_printf("idle\n"); 1738 break; 1739 1740 default: 1741 mdb_printf("unknown libproc Pstate: %d\n", Pstate(P)); 1742 } 1743 mdb_free(panicbuf, PANIC_BUFSIZE); 1744 1745 } else if (pt->p_file != NULL) { 1746 const GElf_Ehdr *ehp = &pt->p_file->gf_ehdr; 1747 1748 mdb_printf("debugging %s file (%d-bit)\n", 1749 ehp->e_type == ET_EXEC ? "executable" : "object", 1750 ehp->e_ident[EI_CLASS] == ELFCLASS32 ? 32 : 64); 1751 mdb_printf("executable file: %s\n", IOP_NAME(pt->p_fio)); 1752 mdb_printf("status: idle\n"); 1753 } 1754 1755 return (DCMD_OK); 1756 } 1757 1758 static int 1759 pt_tls(uintptr_t tid, uint_t flags, int argc, const mdb_arg_t *argv) 1760 { 1761 const char *name; 1762 const char *object; 1763 GElf_Sym sym; 1764 mdb_syminfo_t si; 1765 mdb_tgt_t *t = mdb.m_target; 1766 1767 if (!(flags & DCMD_ADDRSPEC) || argc > 1) 1768 return (DCMD_USAGE); 1769 1770 if (argc == 0) { 1771 psaddr_t b; 1772 1773 if (tlsbase(t, tid, PR_LMID_EVERY, MDB_TGT_OBJ_EXEC, &b) != 0) { 1774 mdb_warn("failed to lookup tlsbase for %r", tid); 1775 return (DCMD_ERR); 1776 } 1777 1778 mdb_printf("%lr\n", b); 1779 mdb_set_dot(b); 1780 1781 return (DCMD_OK); 1782 } 1783 1784 name = argv[0].a_un.a_str; 1785 object = MDB_TGT_OBJ_EVERY; 1786 1787 if (pt_lookup_by_name_thr(t, object, name, &sym, &si, tid) != 0) { 1788 mdb_warn("failed to lookup %s", name); 1789 return (DCMD_ABORT); /* avoid repeated failure */ 1790 } 1791 1792 if (GELF_ST_TYPE(sym.st_info) != STT_TLS && DCMD_HDRSPEC(flags)) 1793 mdb_warn("%s does not refer to thread local storage\n", name); 1794 1795 mdb_printf("%llr\n", sym.st_value); 1796 mdb_set_dot(sym.st_value); 1797 1798 return (DCMD_OK); 1799 } 1800 1801 /*ARGSUSED*/ 1802 static int 1803 pt_tmodel(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv) 1804 { 1805 mdb_tgt_t *t = mdb.m_target; 1806 pt_data_t *pt = t->t_data; 1807 const pt_ptl_ops_t *ptl_ops; 1808 1809 if (argc != 1 || argv->a_type != MDB_TYPE_STRING) 1810 return (DCMD_USAGE); 1811 1812 if (strcmp(argv->a_un.a_str, "thread") == 0) 1813 ptl_ops = &proc_tdb_ops; 1814 else if (strcmp(argv->a_un.a_str, "lwp") == 0) 1815 ptl_ops = &proc_lwp_ops; 1816 else 1817 return (DCMD_USAGE); 1818 1819 if (t->t_pshandle != NULL && pt->p_ptl_ops != ptl_ops) { 1820 PTL_DTOR(t); 1821 pt->p_tdb_ops = NULL; 1822 pt->p_ptl_ops = &proc_lwp_ops; 1823 pt->p_ptl_hdl = NULL; 1824 1825 if (ptl_ops == &proc_tdb_ops) { 1826 (void) Pobject_iter(t->t_pshandle, (proc_map_f *) 1827 thr_check, t); 1828 } 1829 } 1830 1831 (void) mdb_tgt_status(t, &t->t_status); 1832 return (DCMD_OK); 1833 } 1834 1835 static const char * 1836 env_match(const char *cmp, const char *nameval) 1837 { 1838 const char *loc; 1839 size_t cmplen = strlen(cmp); 1840 1841 loc = strchr(nameval, '='); 1842 if (loc != NULL && (loc - nameval) == cmplen && 1843 strncmp(nameval, cmp, cmplen) == 0) { 1844 return (loc + 1); 1845 } 1846 1847 return (NULL); 1848 } 1849 1850 /*ARGSUSED*/ 1851 static int 1852 print_env(void *data, struct ps_prochandle *P, uintptr_t addr, 1853 const char *nameval) 1854 { 1855 const char *value; 1856 1857 if (nameval == NULL) { 1858 mdb_printf("<0x%p>\n", addr); 1859 } else { 1860 if (data == NULL) 1861 mdb_printf("%s\n", nameval); 1862 else if ((value = env_match(data, nameval)) != NULL) 1863 mdb_printf("%s\n", value); 1864 } 1865 1866 return (0); 1867 } 1868 1869 /*ARGSUSED*/ 1870 static int 1871 pt_getenv(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv) 1872 { 1873 mdb_tgt_t *t = mdb.m_target; 1874 pt_data_t *pt = t->t_data; 1875 int i; 1876 uint_t opt_t = 0; 1877 mdb_var_t *v; 1878 1879 i = mdb_getopts(argc, argv, 1880 't', MDB_OPT_SETBITS, TRUE, &opt_t, NULL); 1881 1882 argc -= i; 1883 argv += i; 1884 1885 if ((flags & DCMD_ADDRSPEC) || argc > 1) 1886 return (DCMD_USAGE); 1887 1888 if (argc == 1 && argv->a_type != MDB_TYPE_STRING) 1889 return (DCMD_USAGE); 1890 1891 if (opt_t && t->t_pshandle == NULL) { 1892 mdb_warn("no process active\n"); 1893 return (DCMD_ERR); 1894 } 1895 1896 if (opt_t && (Pstate(t->t_pshandle) == PS_IDLE || 1897 Pstate(t->t_pshandle) == PS_UNDEAD)) { 1898 mdb_warn("-t option requires target to be running\n"); 1899 return (DCMD_ERR); 1900 } 1901 1902 if (opt_t != 0) { 1903 if (Penv_iter(t->t_pshandle, print_env, 1904 argc == 0 ? NULL : (void *)argv->a_un.a_str) != 0) 1905 return (DCMD_ERR); 1906 } else if (argc == 1) { 1907 if ((v = mdb_nv_lookup(&pt->p_env, argv->a_un.a_str)) == NULL) 1908 return (DCMD_ERR); 1909 1910 ASSERT(strchr(mdb_nv_get_cookie(v), '=') != NULL); 1911 mdb_printf("%s\n", strchr(mdb_nv_get_cookie(v), '=') + 1); 1912 } else { 1913 1914 mdb_nv_rewind(&pt->p_env); 1915 while ((v = mdb_nv_advance(&pt->p_env)) != NULL) 1916 mdb_printf("%s\n", mdb_nv_get_cookie(v)); 1917 } 1918 1919 return (DCMD_OK); 1920 } 1921 1922 /* 1923 * Function to set a variable in the internal environment, which is used when 1924 * creating new processes. Note that it is possible that 'nameval' can refer to 1925 * read-only memory, if mdb calls putenv() on an existing value before calling 1926 * this function. While we should avoid this situation, this function is 1927 * designed to be robust in the face of such changes. 1928 */ 1929 static void 1930 pt_env_set(pt_data_t *pt, const char *nameval) 1931 { 1932 mdb_var_t *v; 1933 char *equals, *val; 1934 const char *name; 1935 size_t len; 1936 1937 if ((equals = strchr(nameval, '=')) != NULL) { 1938 val = strdup(nameval); 1939 equals = val + (equals - nameval); 1940 } else { 1941 /* 1942 * nameval doesn't contain an equals character. Convert this to 1943 * be 'nameval='. 1944 */ 1945 len = strlen(nameval); 1946 val = mdb_alloc(len + 2, UM_SLEEP); 1947 (void) mdb_snprintf(val, len + 2, "%s=", nameval); 1948 equals = val + len; 1949 } 1950 1951 /* temporary truncate the string for lookup/insert */ 1952 *equals = '\0'; 1953 v = mdb_nv_lookup(&pt->p_env, val); 1954 1955 if (v != NULL) { 1956 char *old = mdb_nv_get_cookie(v); 1957 mdb_free(old, strlen(old) + 1); 1958 name = mdb_nv_get_name(v); 1959 } else { 1960 /* 1961 * The environment is created using MDB_NV_EXTNAME, so we must 1962 * provide external storage for the variable names. 1963 */ 1964 name = strdup(val); 1965 } 1966 1967 *equals = '='; 1968 1969 (void) mdb_nv_insert(&pt->p_env, name, NULL, (uintptr_t)val, 1970 MDB_NV_EXTNAME); 1971 1972 if (equals) 1973 *equals = '='; 1974 } 1975 1976 /* 1977 * Clears the internal environment. 1978 */ 1979 static void 1980 pt_env_clear(pt_data_t *pt) 1981 { 1982 mdb_var_t *v; 1983 char *val, *name; 1984 1985 mdb_nv_rewind(&pt->p_env); 1986 while ((v = mdb_nv_advance(&pt->p_env)) != NULL) { 1987 1988 name = (char *)mdb_nv_get_name(v); 1989 val = mdb_nv_get_cookie(v); 1990 1991 mdb_nv_remove(&pt->p_env, v); 1992 1993 mdb_free(name, strlen(name) + 1); 1994 mdb_free(val, strlen(val) + 1); 1995 } 1996 } 1997 1998 /*ARGSUSED*/ 1999 static int 2000 pt_setenv(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv) 2001 { 2002 mdb_tgt_t *t = mdb.m_target; 2003 pt_data_t *pt = t->t_data; 2004 char *nameval; 2005 size_t len; 2006 int alloc; 2007 2008 if ((flags & DCMD_ADDRSPEC) || argc == 0 || argc > 2) 2009 return (DCMD_USAGE); 2010 2011 if ((argc > 0 && argv[0].a_type != MDB_TYPE_STRING) || 2012 (argc > 1 && argv[1].a_type != MDB_TYPE_STRING)) 2013 return (DCMD_USAGE); 2014 2015 if (t->t_pshandle == NULL) { 2016 mdb_warn("no process active\n"); 2017 return (DCMD_ERR); 2018 } 2019 2020 /* 2021 * If the process is in some sort of running state, warn the user that 2022 * changes won't immediately take effect. 2023 */ 2024 if (Pstate(t->t_pshandle) == PS_RUN || 2025 Pstate(t->t_pshandle) == PS_STOP) { 2026 mdb_warn("warning: changes will not take effect until process" 2027 " is restarted\n"); 2028 } 2029 2030 /* 2031 * We allow two forms of operation. The first is the usual "name=value" 2032 * parameter. We also allow the user to specify two arguments, where 2033 * the first is the name of the variable, and the second is the value. 2034 */ 2035 alloc = 0; 2036 if (argc == 1) { 2037 nameval = (char *)argv->a_un.a_str; 2038 } else { 2039 len = strlen(argv[0].a_un.a_str) + 2040 strlen(argv[1].a_un.a_str) + 2; 2041 nameval = mdb_alloc(len, UM_SLEEP); 2042 (void) mdb_snprintf(nameval, len, "%s=%s", argv[0].a_un.a_str, 2043 argv[1].a_un.a_str); 2044 alloc = 1; 2045 } 2046 2047 pt_env_set(pt, nameval); 2048 2049 if (alloc) 2050 mdb_free(nameval, strlen(nameval) + 1); 2051 2052 return (DCMD_OK); 2053 } 2054 2055 /*ARGSUSED*/ 2056 static int 2057 pt_unsetenv(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv) 2058 { 2059 mdb_tgt_t *t = mdb.m_target; 2060 pt_data_t *pt = t->t_data; 2061 mdb_var_t *v; 2062 char *value, *name; 2063 2064 if ((flags & DCMD_ADDRSPEC) || argc > 1) 2065 return (DCMD_USAGE); 2066 2067 if (argc == 1 && argv->a_type != MDB_TYPE_STRING) 2068 return (DCMD_USAGE); 2069 2070 if (t->t_pshandle == NULL) { 2071 mdb_warn("no process active\n"); 2072 return (DCMD_ERR); 2073 } 2074 2075 /* 2076 * If the process is in some sort of running state, warn the user that 2077 * changes won't immediately take effect. 2078 */ 2079 if (Pstate(t->t_pshandle) == PS_RUN || 2080 Pstate(t->t_pshandle) == PS_STOP) { 2081 mdb_warn("warning: changes will not take effect until process" 2082 " is restarted\n"); 2083 } 2084 2085 if (argc == 0) { 2086 pt_env_clear(pt); 2087 } else { 2088 if ((v = mdb_nv_lookup(&pt->p_env, argv->a_un.a_str)) != NULL) { 2089 name = (char *)mdb_nv_get_name(v); 2090 value = mdb_nv_get_cookie(v); 2091 2092 mdb_nv_remove(&pt->p_env, v); 2093 2094 mdb_free(name, strlen(name) + 1); 2095 mdb_free(value, strlen(value) + 1); 2096 } 2097 } 2098 2099 return (DCMD_OK); 2100 } 2101 2102 void 2103 getenv_help(void) 2104 { 2105 mdb_printf("-t show current process environment" 2106 " instead of initial environment.\n"); 2107 } 2108 2109 static const mdb_dcmd_t pt_dcmds[] = { 2110 { "$c", "?[cnt]", "print stack backtrace", pt_stack }, 2111 { "$C", "?[cnt]", "print stack backtrace", pt_stackv }, 2112 { "$i", NULL, "print signals that are ignored", pt_ignored }, 2113 { "$l", NULL, "print the representative thread's lwp id", pt_lwpid }, 2114 { "$L", NULL, "print list of the active lwp ids", pt_lwpids }, 2115 { "$r", "?[-u]", "print general-purpose registers", pt_regs }, 2116 { "$x", "?", "print floating point registers", pt_fpregs }, 2117 { "$X", "?", "print floating point registers", pt_fpregs }, 2118 { "$y", "?", "print floating point registers", pt_fpregs }, 2119 { "$Y", "?", "print floating point registers", pt_fpregs }, 2120 { "$?", "?", "print status and registers", pt_regstatus }, 2121 { ":A", "?[core|pid]", "attach to process or core file", pt_attach }, 2122 { ":i", ":", "ignore signal (delete all matching events)", pt_ignore }, 2123 { ":k", NULL, "forcibly kill and release target", pt_kill }, 2124 { ":R", "[-a]", "release the previously attached process", pt_detach }, 2125 { "attach", "?[core|pid]", 2126 "attach to process or core file", pt_attach }, 2127 { "findstack", ":[-v]", "find user thread stack", pt_findstack }, 2128 { "gcore", "[-o prefix] [-c content]", 2129 "produce a core file for the attached process", pt_gcore }, 2130 { "getenv", "[-t] [name]", "display an environment variable", 2131 pt_getenv, getenv_help }, 2132 { "kill", NULL, "forcibly kill and release target", pt_kill }, 2133 { "release", "[-a]", 2134 "release the previously attached process", pt_detach }, 2135 { "regs", "?[-u]", "print general-purpose registers", pt_regs }, 2136 { "fpregs", "?[-dqs]", "print floating point registers", pt_fpregs }, 2137 { "setenv", "name=value", "set an environment variable", pt_setenv }, 2138 { "stack", "?[cnt]", "print stack backtrace", pt_stack }, 2139 { "stackregs", "?", "print stack backtrace and registers", pt_stackr }, 2140 { "status", NULL, "print summary of current target", pt_status_dcmd }, 2141 { "tls", ":symbol", 2142 "lookup TLS data in the context of a given thread", pt_tls }, 2143 { "tmodel", "{thread|lwp}", NULL, pt_tmodel }, 2144 { "unsetenv", "[name]", "clear an environment variable", pt_unsetenv }, 2145 { NULL } 2146 }; 2147 2148 static void 2149 pt_thr_walk_fini(mdb_walk_state_t *wsp) 2150 { 2151 mdb_addrvec_destroy(wsp->walk_data); 2152 mdb_free(wsp->walk_data, sizeof (mdb_addrvec_t)); 2153 } 2154 2155 static int 2156 pt_thr_walk_init(mdb_walk_state_t *wsp) 2157 { 2158 wsp->walk_data = mdb_zalloc(sizeof (mdb_addrvec_t), UM_SLEEP); 2159 mdb_addrvec_create(wsp->walk_data); 2160 2161 if (PTL_ITER(mdb.m_target, wsp->walk_data) == -1) { 2162 mdb_warn("failed to iterate over threads"); 2163 pt_thr_walk_fini(wsp); 2164 return (WALK_ERR); 2165 } 2166 2167 return (WALK_NEXT); 2168 } 2169 2170 static int 2171 pt_thr_walk_step(mdb_walk_state_t *wsp) 2172 { 2173 if (mdb_addrvec_length(wsp->walk_data) != 0) { 2174 return (wsp->walk_callback(mdb_addrvec_shift(wsp->walk_data), 2175 NULL, wsp->walk_cbdata)); 2176 } 2177 return (WALK_DONE); 2178 } 2179 2180 static const mdb_walker_t pt_walkers[] = { 2181 { "thread", "walk list of valid thread identifiers", 2182 pt_thr_walk_init, pt_thr_walk_step, pt_thr_walk_fini }, 2183 { NULL } 2184 }; 2185 2186 static int 2187 pt_agent_check(boolean_t *agent, const lwpstatus_t *psp) 2188 { 2189 if (psp->pr_flags & PR_AGENT) 2190 *agent = B_TRUE; 2191 2192 return (0); 2193 } 2194 2195 static void 2196 pt_activate_common(mdb_tgt_t *t) 2197 { 2198 pt_data_t *pt = t->t_data; 2199 boolean_t hasagent = B_FALSE; 2200 GElf_Sym sym; 2201 2202 /* 2203 * If we have a libproc handle and AT_BASE is set, the process or core 2204 * is dynamically linked. We call Prd_agent() to force libproc to 2205 * try to initialize librtld_db, and issue a warning if that fails. 2206 */ 2207 if (t->t_pshandle != NULL && Pgetauxval(t->t_pshandle, 2208 AT_BASE) != -1L && Prd_agent(t->t_pshandle) == NULL) { 2209 mdb_warn("warning: librtld_db failed to initialize; shared " 2210 "library information will not be available\n"); 2211 } 2212 2213 if (t->t_pshandle != NULL) { 2214 (void) Plwp_iter(t->t_pshandle, 2215 (proc_lwp_f *)pt_agent_check, &hasagent); 2216 } 2217 2218 if (hasagent) { 2219 mdb_warn("agent lwp detected; forcing " 2220 "lwp thread model (use ::tmodel to change)\n"); 2221 } else if (t->t_pshandle != NULL && Pstate(t->t_pshandle) != PS_IDLE) { 2222 /* 2223 * If we have a libproc handle and we do not have an agent LWP, 2224 * look for the correct thread debugging library. (If we have 2225 * an agent LWP, we leave the model as the raw LWP model to 2226 * allow the agent LWP to be visible to the debugger.) 2227 */ 2228 (void) Pobject_iter(t->t_pshandle, (proc_map_f *)thr_check, t); 2229 } 2230 2231 /* 2232 * If there's a global object named '_mdb_abort_info', assuming we're 2233 * debugging mdb itself and load the developer support module. 2234 */ 2235 if (mdb_gelf_symtab_lookup_by_name(pt->p_symtab, "_mdb_abort_info", 2236 &sym, NULL) == 0 && GELF_ST_TYPE(sym.st_info) == STT_OBJECT) { 2237 if (mdb_module_load("mdb_ds", MDB_MOD_SILENT) < 0) 2238 mdb_warn("warning: failed to load developer support\n"); 2239 } 2240 2241 mdb_tgt_elf_export(pt->p_file); 2242 } 2243 2244 static void 2245 pt_activate(mdb_tgt_t *t) 2246 { 2247 static const mdb_nv_disc_t reg_disc = { reg_disc_set, reg_disc_get }; 2248 2249 pt_data_t *pt = t->t_data; 2250 struct utsname u1, u2; 2251 mdb_var_t *v; 2252 core_content_t content; 2253 2254 if (t->t_pshandle) { 2255 mdb_prop_postmortem = (Pstate(t->t_pshandle) == PS_DEAD); 2256 mdb_prop_kernel = FALSE; 2257 } else 2258 mdb_prop_kernel = mdb_prop_postmortem = FALSE; 2259 2260 mdb_prop_datamodel = MDB_TGT_MODEL_NATIVE; 2261 2262 /* 2263 * If we're examining a core file that doesn't contain program text, 2264 * and uname(2) doesn't match the NT_UTSNAME note recorded in the 2265 * core file, issue a warning. 2266 */ 2267 if (mdb_prop_postmortem == TRUE && 2268 ((content = Pcontent(t->t_pshandle)) == CC_CONTENT_INVALID || 2269 !(content & CC_CONTENT_TEXT)) && 2270 uname(&u1) >= 0 && Puname(t->t_pshandle, &u2) == 0 && 2271 (strcmp(u1.release, u2.release) != 0 || 2272 strcmp(u1.version, u2.version) != 0)) { 2273 mdb_warn("warning: core file is from %s %s %s; shared text " 2274 "mappings may not match installed libraries\n", 2275 u2.sysname, u2.release, u2.version); 2276 } 2277 2278 /* 2279 * Perform the common initialization tasks -- these are shared with 2280 * the pt_exec() and pt_run() subroutines. 2281 */ 2282 pt_activate_common(t); 2283 2284 (void) mdb_tgt_register_dcmds(t, &pt_dcmds[0], MDB_MOD_FORCE); 2285 (void) mdb_tgt_register_walkers(t, &pt_walkers[0], MDB_MOD_FORCE); 2286 2287 /* 2288 * Iterate through our register description list and export 2289 * each register as a named variable. 2290 */ 2291 mdb_nv_rewind(&pt->p_regs); 2292 while ((v = mdb_nv_advance(&pt->p_regs)) != NULL) { 2293 ushort_t rd_flags = MDB_TGT_R_FLAGS(mdb_nv_get_value(v)); 2294 2295 if (!(rd_flags & MDB_TGT_R_EXPORT)) 2296 continue; /* Don't export register as a variable */ 2297 2298 (void) mdb_nv_insert(&mdb.m_nv, mdb_nv_get_name(v), ®_disc, 2299 (uintptr_t)t, MDB_NV_PERSIST); 2300 } 2301 } 2302 2303 static void 2304 pt_deactivate(mdb_tgt_t *t) 2305 { 2306 pt_data_t *pt = t->t_data; 2307 const mdb_dcmd_t *dcp; 2308 const mdb_walker_t *wp; 2309 mdb_var_t *v, *w; 2310 2311 mdb_nv_rewind(&pt->p_regs); 2312 while ((v = mdb_nv_advance(&pt->p_regs)) != NULL) { 2313 ushort_t rd_flags = MDB_TGT_R_FLAGS(mdb_nv_get_value(v)); 2314 2315 if (!(rd_flags & MDB_TGT_R_EXPORT)) 2316 continue; /* Didn't export register as a variable */ 2317 2318 if (w = mdb_nv_lookup(&mdb.m_nv, mdb_nv_get_name(v))) { 2319 w->v_flags &= ~MDB_NV_PERSIST; 2320 mdb_nv_remove(&mdb.m_nv, w); 2321 } 2322 } 2323 2324 for (wp = &pt_walkers[0]; wp->walk_name != NULL; wp++) { 2325 if (mdb_module_remove_walker(t->t_module, wp->walk_name) == -1) 2326 warn("failed to remove walk %s", wp->walk_name); 2327 } 2328 2329 for (dcp = &pt_dcmds[0]; dcp->dc_name != NULL; dcp++) { 2330 if (mdb_module_remove_dcmd(t->t_module, dcp->dc_name) == -1) 2331 warn("failed to remove dcmd %s", dcp->dc_name); 2332 } 2333 2334 mdb_prop_postmortem = FALSE; 2335 mdb_prop_kernel = FALSE; 2336 mdb_prop_datamodel = MDB_TGT_MODEL_UNKNOWN; 2337 } 2338 2339 static void 2340 pt_periodic(mdb_tgt_t *t) 2341 { 2342 pt_data_t *pt = t->t_data; 2343 2344 if (pt->p_rdstate == PT_RD_CONSIST) { 2345 if (t->t_pshandle != NULL && Pstate(t->t_pshandle) < PS_LOST && 2346 !(mdb.m_flags & MDB_FL_NOMODS)) { 2347 mdb_printf("%s: You've got symbols!\n", mdb.m_pname); 2348 mdb_module_load_all(0); 2349 } 2350 pt->p_rdstate = PT_RD_NONE; 2351 } 2352 } 2353 2354 static void 2355 pt_destroy(mdb_tgt_t *t) 2356 { 2357 pt_data_t *pt = t->t_data; 2358 2359 if (pt->p_idlehandle != NULL && pt->p_idlehandle != t->t_pshandle) 2360 Prelease(pt->p_idlehandle, 0); 2361 2362 if (t->t_pshandle != NULL) { 2363 PTL_DTOR(t); 2364 pt_release_parents(t); 2365 pt_pre_detach(t, TRUE); 2366 Prelease(t->t_pshandle, pt->p_rflags); 2367 } 2368 2369 mdb.m_flags &= ~(MDB_FL_VCREATE | MDB_FL_JOBCTL); 2370 pt_close_aout(t); 2371 2372 if (pt->p_aout_fio != NULL) 2373 mdb_io_rele(pt->p_aout_fio); 2374 2375 pt_env_clear(pt); 2376 mdb_nv_destroy(&pt->p_env); 2377 2378 mdb_nv_destroy(&pt->p_regs); 2379 mdb_free(pt, sizeof (pt_data_t)); 2380 } 2381 2382 /*ARGSUSED*/ 2383 static const char * 2384 pt_name(mdb_tgt_t *t) 2385 { 2386 return ("proc"); 2387 } 2388 2389 static const char * 2390 pt_platform(mdb_tgt_t *t) 2391 { 2392 pt_data_t *pt = t->t_data; 2393 2394 if (t->t_pshandle != NULL && 2395 Pplatform(t->t_pshandle, pt->p_platform, MAXNAMELEN) != NULL) 2396 return (pt->p_platform); 2397 2398 return (mdb_conf_platform()); 2399 } 2400 2401 static int 2402 pt_uname(mdb_tgt_t *t, struct utsname *utsp) 2403 { 2404 if (t->t_pshandle != NULL) 2405 return (Puname(t->t_pshandle, utsp)); 2406 2407 return (uname(utsp) >= 0 ? 0 : -1); 2408 } 2409 2410 static int 2411 pt_dmodel(mdb_tgt_t *t) 2412 { 2413 if (t->t_pshandle == NULL) 2414 return (MDB_TGT_MODEL_NATIVE); 2415 2416 switch (Pstatus(t->t_pshandle)->pr_dmodel) { 2417 case PR_MODEL_ILP32: 2418 return (MDB_TGT_MODEL_ILP32); 2419 case PR_MODEL_LP64: 2420 return (MDB_TGT_MODEL_LP64); 2421 } 2422 2423 return (MDB_TGT_MODEL_UNKNOWN); 2424 } 2425 2426 static ssize_t 2427 pt_vread(mdb_tgt_t *t, void *buf, size_t nbytes, uintptr_t addr) 2428 { 2429 ssize_t n; 2430 2431 /* 2432 * If no handle is open yet, reads from virtual addresses are 2433 * allowed to succeed but return zero-filled memory. 2434 */ 2435 if (t->t_pshandle == NULL) { 2436 bzero(buf, nbytes); 2437 return (nbytes); 2438 } 2439 2440 if ((n = Pread(t->t_pshandle, buf, nbytes, addr)) <= 0) 2441 return (set_errno(EMDB_NOMAP)); 2442 2443 return (n); 2444 } 2445 2446 static ssize_t 2447 pt_vwrite(mdb_tgt_t *t, const void *buf, size_t nbytes, uintptr_t addr) 2448 { 2449 ssize_t n; 2450 2451 /* 2452 * If no handle is open yet, writes to virtual addresses are 2453 * allowed to succeed but do not actually modify anything. 2454 */ 2455 if (t->t_pshandle == NULL) 2456 return (nbytes); 2457 2458 n = Pwrite(t->t_pshandle, buf, nbytes, addr); 2459 2460 if (n == -1 && errno == EIO) 2461 return (set_errno(EMDB_NOMAP)); 2462 2463 return (n); 2464 } 2465 2466 static ssize_t 2467 pt_fread(mdb_tgt_t *t, void *buf, size_t nbytes, uintptr_t addr) 2468 { 2469 pt_data_t *pt = t->t_data; 2470 2471 if (pt->p_file != NULL) { 2472 return (mdb_gelf_rw(pt->p_file, buf, nbytes, addr, 2473 IOPF_READ(pt->p_fio), GIO_READ)); 2474 } 2475 2476 bzero(buf, nbytes); 2477 return (nbytes); 2478 } 2479 2480 static ssize_t 2481 pt_fwrite(mdb_tgt_t *t, const void *buf, size_t nbytes, uintptr_t addr) 2482 { 2483 pt_data_t *pt = t->t_data; 2484 2485 if (pt->p_file != NULL) { 2486 return (mdb_gelf_rw(pt->p_file, (void *)buf, nbytes, addr, 2487 IOPF_WRITE(pt->p_fio), GIO_WRITE)); 2488 } 2489 2490 return (nbytes); 2491 } 2492 2493 static const char * 2494 pt_resolve_lmid(const char *object, Lmid_t *lmidp) 2495 { 2496 Lmid_t lmid = PR_LMID_EVERY; 2497 const char *p; 2498 2499 if (object == MDB_TGT_OBJ_EVERY || object == MDB_TGT_OBJ_EXEC) 2500 lmid = LM_ID_BASE; /* restrict scope to a.out's link map */ 2501 else if (object != MDB_TGT_OBJ_RTLD && strncmp(object, "LM", 2) == 0 && 2502 (p = strchr(object, '`')) != NULL) { 2503 object += 2; /* skip past initial "LM" prefix */ 2504 lmid = strntoul(object, (size_t)(p - object), mdb.m_radix); 2505 object = p + 1; /* skip past link map specifier */ 2506 } 2507 2508 *lmidp = lmid; 2509 return (object); 2510 } 2511 2512 static int 2513 tlsbase(mdb_tgt_t *t, mdb_tgt_tid_t tid, Lmid_t lmid, const char *object, 2514 psaddr_t *basep) 2515 { 2516 pt_data_t *pt = t->t_data; 2517 const rd_loadobj_t *loadobjp; 2518 td_thrhandle_t th; 2519 td_err_e err; 2520 2521 if (object == MDB_TGT_OBJ_EVERY) 2522 return (set_errno(EINVAL)); 2523 2524 if (t->t_pshandle == NULL || Pstate(t->t_pshandle) == PS_IDLE) 2525 return (set_errno(EMDB_NOPROC)); 2526 2527 if (pt->p_tdb_ops == NULL) 2528 return (set_errno(EMDB_TDB)); 2529 2530 err = pt->p_tdb_ops->td_ta_map_id2thr(pt->p_ptl_hdl, tid, &th); 2531 if (err != TD_OK) 2532 return (set_errno(tdb_to_errno(err))); 2533 2534 /* 2535 * If this fails, rtld_db has failed to initialize properly. 2536 */ 2537 if ((loadobjp = Plmid_to_loadobj(t->t_pshandle, lmid, object)) == NULL) 2538 return (set_errno(EMDB_NORTLD)); 2539 2540 /* 2541 * This will fail if the TLS block has not been allocated for the 2542 * object that contains the TLS symbol in question. 2543 */ 2544 err = pt->p_tdb_ops->td_thr_tlsbase(&th, loadobjp->rl_tlsmodid, basep); 2545 if (err != TD_OK) 2546 return (set_errno(tdb_to_errno(err))); 2547 2548 return (0); 2549 } 2550 2551 typedef struct { 2552 mdb_tgt_t *pl_tgt; 2553 const char *pl_name; 2554 Lmid_t pl_lmid; 2555 GElf_Sym *pl_symp; 2556 mdb_syminfo_t *pl_sip; 2557 mdb_tgt_tid_t pl_tid; 2558 mdb_bool_t pl_found; 2559 } pt_lookup_t; 2560 2561 /*ARGSUSED*/ 2562 static int 2563 pt_lookup_cb(void *data, const prmap_t *pmp, const char *object) 2564 { 2565 pt_lookup_t *plp = data; 2566 struct ps_prochandle *P = plp->pl_tgt->t_pshandle; 2567 prsyminfo_t si; 2568 GElf_Sym sym; 2569 2570 if (Pxlookup_by_name(P, plp->pl_lmid, object, plp->pl_name, &sym, 2571 &si) != 0) 2572 return (0); 2573 2574 /* 2575 * If we encounter a match with SHN_UNDEF, keep looking for a 2576 * better match. Return the first match with SHN_UNDEF set if no 2577 * better match is found. 2578 */ 2579 if (sym.st_shndx == SHN_UNDEF) { 2580 if (!plp->pl_found) { 2581 plp->pl_found = TRUE; 2582 *plp->pl_symp = sym; 2583 plp->pl_sip->sym_table = si.prs_table; 2584 plp->pl_sip->sym_id = si.prs_id; 2585 } 2586 2587 return (0); 2588 } 2589 2590 /* 2591 * Note that if the symbol's st_shndx is SHN_UNDEF we don't have the 2592 * TLS offset anyway, so adding in the tlsbase would be worthless. 2593 */ 2594 if (GELF_ST_TYPE(sym.st_info) == STT_TLS && 2595 plp->pl_tid != (mdb_tgt_tid_t)-1) { 2596 psaddr_t base; 2597 2598 if (tlsbase(plp->pl_tgt, plp->pl_tid, plp->pl_lmid, object, 2599 &base) != 0) 2600 return (-1); /* errno is set for us */ 2601 2602 sym.st_value += base; 2603 } 2604 2605 plp->pl_found = TRUE; 2606 *plp->pl_symp = sym; 2607 plp->pl_sip->sym_table = si.prs_table; 2608 plp->pl_sip->sym_id = si.prs_id; 2609 2610 return (1); 2611 } 2612 2613 /* 2614 * Lookup the symbol with a thread context so that we can adjust TLS symbols 2615 * to get the values as they would appear in the context of the given thread. 2616 */ 2617 static int 2618 pt_lookup_by_name_thr(mdb_tgt_t *t, const char *object, 2619 const char *name, GElf_Sym *symp, mdb_syminfo_t *sip, mdb_tgt_tid_t tid) 2620 { 2621 struct ps_prochandle *P = t->t_pshandle; 2622 pt_data_t *pt = t->t_data; 2623 Lmid_t lmid; 2624 uint_t i; 2625 const rd_loadobj_t *aout_lop; 2626 2627 object = pt_resolve_lmid(object, &lmid); 2628 2629 if (P != NULL) { 2630 pt_lookup_t pl; 2631 2632 pl.pl_tgt = t; 2633 pl.pl_name = name; 2634 pl.pl_lmid = lmid; 2635 pl.pl_symp = symp; 2636 pl.pl_sip = sip; 2637 pl.pl_tid = tid; 2638 pl.pl_found = FALSE; 2639 2640 if (object == MDB_TGT_OBJ_EVERY) { 2641 if (Pobject_iter_resolved(P, pt_lookup_cb, &pl) == -1) 2642 return (-1); /* errno is set for us */ 2643 if ((!pl.pl_found) && 2644 (Pobject_iter(P, pt_lookup_cb, &pl) == -1)) 2645 return (-1); /* errno is set for us */ 2646 } else { 2647 const prmap_t *pmp; 2648 2649 /* 2650 * This can fail either due to an invalid lmid or 2651 * an invalid object. To determine which is 2652 * faulty, we test the lmid against known valid 2653 * lmids and then see if using a wild-card lmid 2654 * improves ths situation. 2655 */ 2656 if ((pmp = Plmid_to_map(P, lmid, object)) == NULL) { 2657 if (lmid != PR_LMID_EVERY && 2658 lmid != LM_ID_BASE && 2659 lmid != LM_ID_LDSO && 2660 Plmid_to_map(P, PR_LMID_EVERY, object) 2661 != NULL) 2662 return (set_errno(EMDB_NOLMID)); 2663 else 2664 return (set_errno(EMDB_NOOBJ)); 2665 } 2666 2667 if (pt_lookup_cb(&pl, pmp, object) == -1) 2668 return (-1); /* errno is set for us */ 2669 } 2670 2671 if (pl.pl_found) 2672 return (0); 2673 } 2674 2675 /* 2676 * If libproc doesn't have the symbols for rtld, we're cooked -- 2677 * mdb doesn't have those symbols either. 2678 */ 2679 if (object == MDB_TGT_OBJ_RTLD) 2680 return (set_errno(EMDB_NOSYM)); 2681 2682 if (object != MDB_TGT_OBJ_EXEC && object != MDB_TGT_OBJ_EVERY) { 2683 int status = mdb_gelf_symtab_lookup_by_file(pt->p_symtab, 2684 object, name, symp, &sip->sym_id); 2685 2686 if (status != 0) { 2687 if (P != NULL && 2688 Plmid_to_map(P, PR_LMID_EVERY, object) != NULL) 2689 return (set_errno(EMDB_NOSYM)); 2690 else 2691 return (-1); /* errno set from lookup_by_file */ 2692 } 2693 2694 goto found; 2695 } 2696 2697 if (mdb_gelf_symtab_lookup_by_name(pt->p_symtab, name, symp, &i) == 0) { 2698 sip->sym_table = MDB_TGT_SYMTAB; 2699 sip->sym_id = i; 2700 goto local_found; 2701 } 2702 2703 if (mdb_gelf_symtab_lookup_by_name(pt->p_dynsym, name, symp, &i) == 0) { 2704 sip->sym_table = MDB_TGT_DYNSYM; 2705 sip->sym_id = i; 2706 goto local_found; 2707 } 2708 2709 return (set_errno(EMDB_NOSYM)); 2710 2711 local_found: 2712 if (pt->p_file != NULL && 2713 pt->p_file->gf_ehdr.e_type == ET_DYN && 2714 P != NULL && 2715 (aout_lop = Pname_to_loadobj(P, PR_OBJ_EXEC)) != NULL) 2716 symp->st_value += aout_lop->rl_base; 2717 2718 found: 2719 /* 2720 * If the symbol has type TLS, libproc should have found the symbol 2721 * if it exists and has been allocated. 2722 */ 2723 if (GELF_ST_TYPE(symp->st_info) == STT_TLS) 2724 return (set_errno(EMDB_TLS)); 2725 2726 return (0); 2727 } 2728 2729 static int 2730 pt_lookup_by_name(mdb_tgt_t *t, const char *object, 2731 const char *name, GElf_Sym *symp, mdb_syminfo_t *sip) 2732 { 2733 return (pt_lookup_by_name_thr(t, object, name, symp, sip, PTL_TID(t))); 2734 } 2735 2736 static int 2737 pt_lookup_by_addr(mdb_tgt_t *t, uintptr_t addr, uint_t flags, 2738 char *buf, size_t nbytes, GElf_Sym *symp, mdb_syminfo_t *sip) 2739 { 2740 struct ps_prochandle *P = t->t_pshandle; 2741 pt_data_t *pt = t->t_data; 2742 rd_plt_info_t rpi = { 0 }; 2743 2744 const char *pltsym; 2745 int rv, match, i; 2746 2747 mdb_gelf_symtab_t *gsts[3]; /* mdb.m_prsym, .symtab, .dynsym */ 2748 int gstc = 0; /* number of valid gsts[] entries */ 2749 2750 mdb_gelf_symtab_t *gst = NULL; /* set if 'sym' is from a gst */ 2751 const prmap_t *pmp = NULL; /* set if 'sym' is from libproc */ 2752 GElf_Sym sym; /* best symbol found so far if !exact */ 2753 prsyminfo_t si; 2754 2755 /* 2756 * Fill in our array of symbol table pointers with the private symbol 2757 * table, static symbol table, and dynamic symbol table if applicable. 2758 * These are done in order of precedence so that if we match and 2759 * MDB_TGT_SYM_EXACT is set, we need not look any further. 2760 */ 2761 if (mdb.m_prsym != NULL) 2762 gsts[gstc++] = mdb.m_prsym; 2763 if (P == NULL && pt->p_symtab != NULL) 2764 gsts[gstc++] = pt->p_symtab; 2765 if (P == NULL && pt->p_dynsym != NULL) 2766 gsts[gstc++] = pt->p_dynsym; 2767 2768 /* 2769 * Loop through our array attempting to match the address. If we match 2770 * and we're in exact mode, we're done. Otherwise save the symbol in 2771 * the local sym variable if it is closer than our previous match. 2772 * We explicitly watch for zero-valued symbols since DevPro insists 2773 * on storing __fsr_init_value's value as the symbol value instead 2774 * of storing it in a constant integer. 2775 */ 2776 for (i = 0; i < gstc; i++) { 2777 if (mdb_gelf_symtab_lookup_by_addr(gsts[i], addr, flags, buf, 2778 nbytes, symp, &sip->sym_id) != 0 || symp->st_value == 0) 2779 continue; 2780 2781 if (flags & MDB_TGT_SYM_EXACT) { 2782 gst = gsts[i]; 2783 goto found; 2784 } 2785 2786 if (gst == NULL || mdb_gelf_sym_closer(symp, &sym, addr)) { 2787 gst = gsts[i]; 2788 sym = *symp; 2789 } 2790 } 2791 2792 /* 2793 * If we have no libproc handle active, we're done: fail if gst is 2794 * NULL; otherwise copy out our best symbol and skip to the end. 2795 * We also skip to found if gst is the private symbol table: we 2796 * want this to always take precedence over PLT re-vectoring. 2797 */ 2798 if (P == NULL || (gst != NULL && gst == mdb.m_prsym)) { 2799 if (gst == NULL) 2800 return (set_errno(EMDB_NOSYMADDR)); 2801 *symp = sym; 2802 goto found; 2803 } 2804 2805 /* 2806 * Check to see if the address is in a PLT: if it is, use librtld_db to 2807 * attempt to resolve the PLT entry. If the entry is bound, reset addr 2808 * to the bound address, add a special prefix to the caller's buf, 2809 * forget our previous guess, and then continue using the new addr. 2810 * If the entry is not bound, copy the corresponding symbol name into 2811 * buf and return a fake symbol for the given address. 2812 */ 2813 if ((pltsym = Ppltdest(P, addr)) != NULL) { 2814 const rd_loadobj_t *rlp; 2815 rd_agent_t *rap; 2816 2817 if ((rap = Prd_agent(P)) != NULL && 2818 (rlp = Paddr_to_loadobj(P, addr)) != NULL && 2819 rd_plt_resolution(rap, addr, Pstatus(P)->pr_lwp.pr_lwpid, 2820 rlp->rl_plt_base, &rpi) == RD_OK && 2821 (rpi.pi_flags & RD_FLG_PI_PLTBOUND)) { 2822 size_t n; 2823 n = mdb_iob_snprintf(buf, nbytes, "PLT="); 2824 addr = rpi.pi_baddr; 2825 if (n > nbytes) { 2826 buf += nbytes; 2827 nbytes = 0; 2828 } else { 2829 buf += n; 2830 nbytes -= n; 2831 } 2832 gst = NULL; 2833 } else { 2834 (void) mdb_iob_snprintf(buf, nbytes, "PLT:%s", pltsym); 2835 bzero(symp, sizeof (GElf_Sym)); 2836 symp->st_value = addr; 2837 symp->st_info = GELF_ST_INFO(STB_GLOBAL, STT_FUNC); 2838 return (0); 2839 } 2840 } 2841 2842 /* 2843 * Ask libproc to convert the address to the closest symbol for us. 2844 * Once we get the closest symbol, we perform the EXACT match or 2845 * smart-mode or absolute distance check ourself: 2846 */ 2847 if (PT_LIBPROC_RESOLVE(P)) { 2848 rv = Pxlookup_by_addr_resolved(P, addr, buf, nbytes, 2849 symp, &si); 2850 } else { 2851 rv = Pxlookup_by_addr(P, addr, buf, nbytes, 2852 symp, &si); 2853 } 2854 if ((rv == 0) && (symp->st_value != 0) && 2855 (gst == NULL || mdb_gelf_sym_closer(symp, &sym, addr))) { 2856 2857 if (flags & MDB_TGT_SYM_EXACT) 2858 match = (addr == symp->st_value); 2859 else if (mdb.m_symdist == 0) 2860 match = (addr >= symp->st_value && 2861 addr < symp->st_value + symp->st_size); 2862 else 2863 match = (addr >= symp->st_value && 2864 addr < symp->st_value + mdb.m_symdist); 2865 2866 if (match) { 2867 pmp = Paddr_to_map(P, addr); 2868 gst = NULL; 2869 sip->sym_table = si.prs_table; 2870 sip->sym_id = si.prs_id; 2871 goto found; 2872 } 2873 } 2874 2875 /* 2876 * If we get here, Plookup_by_addr has failed us. If we have no 2877 * previous best symbol (gst == NULL), we've failed completely. 2878 * Otherwise we copy out that symbol and continue on to 'found'. 2879 */ 2880 if (gst == NULL) 2881 return (set_errno(EMDB_NOSYMADDR)); 2882 *symp = sym; 2883 found: 2884 /* 2885 * Once we've found something, copy the final name into the caller's 2886 * buffer and prefix it with the mapping name if appropriate. 2887 */ 2888 if (pmp != NULL && pmp != Pname_to_map(P, PR_OBJ_EXEC)) { 2889 const char *prefix = pmp->pr_mapname; 2890 Lmid_t lmid; 2891 2892 if (PT_LIBPROC_RESOLVE(P)) { 2893 if (Pobjname_resolved(P, addr, pt->p_objname, 2894 MDB_TGT_MAPSZ)) 2895 prefix = pt->p_objname; 2896 } else { 2897 if (Pobjname(P, addr, pt->p_objname, MDB_TGT_MAPSZ)) 2898 prefix = pt->p_objname; 2899 } 2900 2901 if (buf != NULL && nbytes > 1) { 2902 (void) strncpy(pt->p_symname, buf, MDB_TGT_SYM_NAMLEN); 2903 pt->p_symname[MDB_TGT_SYM_NAMLEN - 1] = '\0'; 2904 } else { 2905 pt->p_symname[0] = '\0'; 2906 } 2907 2908 if (prefix == pt->p_objname && Plmid(P, addr, &lmid) == 0 && ( 2909 (lmid != LM_ID_BASE && lmid != LM_ID_LDSO) || 2910 (mdb.m_flags & MDB_FL_SHOWLMID))) { 2911 (void) mdb_iob_snprintf(buf, nbytes, "LM%lr`%s`%s", 2912 lmid, strbasename(prefix), pt->p_symname); 2913 } else { 2914 (void) mdb_iob_snprintf(buf, nbytes, "%s`%s", 2915 strbasename(prefix), pt->p_symname); 2916 } 2917 2918 } else if (gst != NULL && buf != NULL && nbytes > 0) { 2919 (void) strncpy(buf, mdb_gelf_sym_name(gst, symp), nbytes); 2920 buf[nbytes - 1] = '\0'; 2921 } 2922 2923 return (0); 2924 } 2925 2926 2927 static int 2928 pt_symbol_iter_cb(void *arg, const GElf_Sym *sym, const char *name, 2929 const prsyminfo_t *sip) 2930 { 2931 pt_symarg_t *psp = arg; 2932 2933 psp->psym_info.sym_id = sip->prs_id; 2934 2935 return (psp->psym_func(psp->psym_private, sym, name, &psp->psym_info, 2936 psp->psym_obj)); 2937 } 2938 2939 static int 2940 pt_objsym_iter(void *arg, const prmap_t *pmp, const char *object) 2941 { 2942 Lmid_t lmid = PR_LMID_EVERY; 2943 pt_symarg_t *psp = arg; 2944 2945 psp->psym_obj = object; 2946 2947 (void) Plmid(psp->psym_targ->t_pshandle, pmp->pr_vaddr, &lmid); 2948 (void) Pxsymbol_iter(psp->psym_targ->t_pshandle, lmid, object, 2949 psp->psym_which, psp->psym_type, pt_symbol_iter_cb, arg); 2950 2951 return (0); 2952 } 2953 2954 static int 2955 pt_symbol_filt(void *arg, const GElf_Sym *sym, const char *name, uint_t id) 2956 { 2957 pt_symarg_t *psp = arg; 2958 2959 if (mdb_tgt_sym_match(sym, psp->psym_type)) { 2960 psp->psym_info.sym_id = id; 2961 return (psp->psym_func(psp->psym_private, sym, name, 2962 &psp->psym_info, psp->psym_obj)); 2963 } 2964 2965 return (0); 2966 } 2967 2968 static int 2969 pt_symbol_iter(mdb_tgt_t *t, const char *object, uint_t which, 2970 uint_t type, mdb_tgt_sym_f *func, void *private) 2971 { 2972 pt_data_t *pt = t->t_data; 2973 mdb_gelf_symtab_t *gst; 2974 pt_symarg_t ps; 2975 Lmid_t lmid; 2976 2977 object = pt_resolve_lmid(object, &lmid); 2978 2979 ps.psym_targ = t; 2980 ps.psym_which = which; 2981 ps.psym_type = type; 2982 ps.psym_func = func; 2983 ps.psym_private = private; 2984 ps.psym_obj = object; 2985 2986 if (t->t_pshandle != NULL) { 2987 if (object != MDB_TGT_OBJ_EVERY) { 2988 if (Plmid_to_map(t->t_pshandle, lmid, object) == NULL) 2989 return (set_errno(EMDB_NOOBJ)); 2990 (void) Pxsymbol_iter(t->t_pshandle, lmid, object, 2991 which, type, pt_symbol_iter_cb, &ps); 2992 return (0); 2993 } else if (Prd_agent(t->t_pshandle) != NULL) { 2994 if (PT_LIBPROC_RESOLVE(t->t_pshandle)) { 2995 (void) Pobject_iter_resolved(t->t_pshandle, 2996 pt_objsym_iter, &ps); 2997 } else { 2998 (void) Pobject_iter(t->t_pshandle, 2999 pt_objsym_iter, &ps); 3000 } 3001 return (0); 3002 } 3003 } 3004 3005 if (lmid != LM_ID_BASE && lmid != PR_LMID_EVERY) 3006 return (set_errno(EMDB_NOLMID)); 3007 3008 if (object != MDB_TGT_OBJ_EXEC && object != MDB_TGT_OBJ_EVERY && 3009 pt->p_fio != NULL && 3010 strcmp(object, IOP_NAME(pt->p_fio)) != 0) 3011 return (set_errno(EMDB_NOOBJ)); 3012 3013 if (which == MDB_TGT_SYMTAB) 3014 gst = pt->p_symtab; 3015 else 3016 gst = pt->p_dynsym; 3017 3018 if (gst != NULL) { 3019 ps.psym_info.sym_table = gst->gst_tabid; 3020 mdb_gelf_symtab_iter(gst, pt_symbol_filt, &ps); 3021 } 3022 3023 return (0); 3024 } 3025 3026 static const mdb_map_t * 3027 pt_prmap_to_mdbmap(mdb_tgt_t *t, const prmap_t *prp, mdb_map_t *mp) 3028 { 3029 struct ps_prochandle *P = t->t_pshandle; 3030 char *rv, name[MAXPATHLEN]; 3031 Lmid_t lmid; 3032 3033 if (PT_LIBPROC_RESOLVE(P)) { 3034 rv = Pobjname_resolved(P, prp->pr_vaddr, name, sizeof (name)); 3035 } else { 3036 rv = Pobjname(P, prp->pr_vaddr, name, sizeof (name)); 3037 } 3038 3039 if (rv != NULL) { 3040 if (Plmid(P, prp->pr_vaddr, &lmid) == 0 && ( 3041 (lmid != LM_ID_BASE && lmid != LM_ID_LDSO) || 3042 (mdb.m_flags & MDB_FL_SHOWLMID))) { 3043 (void) mdb_iob_snprintf(mp->map_name, MDB_TGT_MAPSZ, 3044 "LM%lr`%s", lmid, name); 3045 } else { 3046 (void) strncpy(mp->map_name, name, MDB_TGT_MAPSZ - 1); 3047 mp->map_name[MDB_TGT_MAPSZ - 1] = '\0'; 3048 } 3049 } else { 3050 (void) strncpy(mp->map_name, prp->pr_mapname, 3051 MDB_TGT_MAPSZ - 1); 3052 mp->map_name[MDB_TGT_MAPSZ - 1] = '\0'; 3053 } 3054 3055 mp->map_base = prp->pr_vaddr; 3056 mp->map_size = prp->pr_size; 3057 mp->map_flags = 0; 3058 3059 if (prp->pr_mflags & MA_READ) 3060 mp->map_flags |= MDB_TGT_MAP_R; 3061 if (prp->pr_mflags & MA_WRITE) 3062 mp->map_flags |= MDB_TGT_MAP_W; 3063 if (prp->pr_mflags & MA_EXEC) 3064 mp->map_flags |= MDB_TGT_MAP_X; 3065 3066 if (prp->pr_mflags & MA_SHM) 3067 mp->map_flags |= MDB_TGT_MAP_SHMEM; 3068 if (prp->pr_mflags & MA_BREAK) 3069 mp->map_flags |= MDB_TGT_MAP_HEAP; 3070 if (prp->pr_mflags & MA_STACK) 3071 mp->map_flags |= MDB_TGT_MAP_STACK; 3072 if (prp->pr_mflags & MA_ANON) 3073 mp->map_flags |= MDB_TGT_MAP_ANON; 3074 3075 return (mp); 3076 } 3077 3078 /*ARGSUSED*/ 3079 static int 3080 pt_map_apply(void *arg, const prmap_t *prp, const char *name) 3081 { 3082 pt_maparg_t *pmp = arg; 3083 mdb_map_t map; 3084 3085 return (pmp->pmap_func(pmp->pmap_private, 3086 pt_prmap_to_mdbmap(pmp->pmap_targ, prp, &map), map.map_name)); 3087 } 3088 3089 static int 3090 pt_mapping_iter(mdb_tgt_t *t, mdb_tgt_map_f *func, void *private) 3091 { 3092 if (t->t_pshandle != NULL) { 3093 pt_maparg_t pm; 3094 3095 pm.pmap_targ = t; 3096 pm.pmap_func = func; 3097 pm.pmap_private = private; 3098 3099 if (PT_LIBPROC_RESOLVE(t->t_pshandle)) { 3100 (void) Pmapping_iter_resolved(t->t_pshandle, 3101 pt_map_apply, &pm); 3102 } else { 3103 (void) Pmapping_iter(t->t_pshandle, 3104 pt_map_apply, &pm); 3105 } 3106 return (0); 3107 } 3108 3109 return (set_errno(EMDB_NOPROC)); 3110 } 3111 3112 static int 3113 pt_object_iter(mdb_tgt_t *t, mdb_tgt_map_f *func, void *private) 3114 { 3115 pt_data_t *pt = t->t_data; 3116 3117 /* 3118 * If we have a libproc handle, we can just call Pobject_iter to 3119 * iterate over its list of load object information. 3120 */ 3121 if (t->t_pshandle != NULL) { 3122 pt_maparg_t pm; 3123 3124 pm.pmap_targ = t; 3125 pm.pmap_func = func; 3126 pm.pmap_private = private; 3127 3128 if (PT_LIBPROC_RESOLVE(t->t_pshandle)) { 3129 (void) Pobject_iter_resolved(t->t_pshandle, 3130 pt_map_apply, &pm); 3131 } else { 3132 (void) Pobject_iter(t->t_pshandle, 3133 pt_map_apply, &pm); 3134 } 3135 return (0); 3136 } 3137 3138 /* 3139 * If we're examining an executable or other ELF file but we have no 3140 * libproc handle, fake up some information based on DT_NEEDED entries. 3141 */ 3142 if (pt->p_dynsym != NULL && pt->p_file->gf_dyns != NULL && 3143 pt->p_fio != NULL) { 3144 mdb_gelf_sect_t *gsp = pt->p_dynsym->gst_ssect; 3145 GElf_Dyn *dynp = pt->p_file->gf_dyns; 3146 mdb_map_t *mp = &pt->p_map; 3147 const char *s = IOP_NAME(pt->p_fio); 3148 size_t i; 3149 3150 (void) strncpy(mp->map_name, s, MDB_TGT_MAPSZ); 3151 mp->map_name[MDB_TGT_MAPSZ - 1] = '\0'; 3152 mp->map_flags = MDB_TGT_MAP_R | MDB_TGT_MAP_X; 3153 mp->map_base = NULL; 3154 mp->map_size = 0; 3155 3156 if (func(private, mp, s) != 0) 3157 return (0); 3158 3159 for (i = 0; i < pt->p_file->gf_ndyns; i++, dynp++) { 3160 if (dynp->d_tag == DT_NEEDED) { 3161 s = (char *)gsp->gs_data + dynp->d_un.d_val; 3162 (void) strncpy(mp->map_name, s, MDB_TGT_MAPSZ); 3163 mp->map_name[MDB_TGT_MAPSZ - 1] = '\0'; 3164 if (func(private, mp, s) != 0) 3165 return (0); 3166 } 3167 } 3168 3169 return (0); 3170 } 3171 3172 return (set_errno(EMDB_NOPROC)); 3173 } 3174 3175 static const mdb_map_t * 3176 pt_addr_to_map(mdb_tgt_t *t, uintptr_t addr) 3177 { 3178 pt_data_t *pt = t->t_data; 3179 const prmap_t *pmp; 3180 3181 if (t->t_pshandle == NULL) { 3182 (void) set_errno(EMDB_NOPROC); 3183 return (NULL); 3184 } 3185 3186 if ((pmp = Paddr_to_map(t->t_pshandle, addr)) == NULL) { 3187 (void) set_errno(EMDB_NOMAP); 3188 return (NULL); 3189 } 3190 3191 return (pt_prmap_to_mdbmap(t, pmp, &pt->p_map)); 3192 } 3193 3194 static const mdb_map_t * 3195 pt_name_to_map(mdb_tgt_t *t, const char *object) 3196 { 3197 pt_data_t *pt = t->t_data; 3198 const prmap_t *pmp; 3199 Lmid_t lmid; 3200 3201 if (t->t_pshandle == NULL) { 3202 (void) set_errno(EMDB_NOPROC); 3203 return (NULL); 3204 } 3205 3206 object = pt_resolve_lmid(object, &lmid); 3207 3208 if ((pmp = Plmid_to_map(t->t_pshandle, lmid, object)) == NULL) { 3209 (void) set_errno(EMDB_NOOBJ); 3210 return (NULL); 3211 } 3212 3213 return (pt_prmap_to_mdbmap(t, pmp, &pt->p_map)); 3214 } 3215 3216 static ctf_file_t * 3217 pt_addr_to_ctf(mdb_tgt_t *t, uintptr_t addr) 3218 { 3219 ctf_file_t *ret; 3220 3221 if (t->t_pshandle == NULL) { 3222 (void) set_errno(EMDB_NOPROC); 3223 return (NULL); 3224 } 3225 3226 if ((ret = Paddr_to_ctf(t->t_pshandle, addr)) == NULL) { 3227 (void) set_errno(EMDB_NOOBJ); 3228 return (NULL); 3229 } 3230 3231 return (ret); 3232 } 3233 3234 static ctf_file_t * 3235 pt_name_to_ctf(mdb_tgt_t *t, const char *name) 3236 { 3237 ctf_file_t *ret; 3238 3239 if (t->t_pshandle == NULL) { 3240 (void) set_errno(EMDB_NOPROC); 3241 return (NULL); 3242 } 3243 3244 if ((ret = Pname_to_ctf(t->t_pshandle, name)) == NULL) { 3245 (void) set_errno(EMDB_NOOBJ); 3246 return (NULL); 3247 } 3248 3249 return (ret); 3250 } 3251 3252 static int 3253 pt_status(mdb_tgt_t *t, mdb_tgt_status_t *tsp) 3254 { 3255 const pstatus_t *psp; 3256 prgregset_t gregs; 3257 int state; 3258 3259 bzero(tsp, sizeof (mdb_tgt_status_t)); 3260 3261 if (t->t_pshandle == NULL) { 3262 tsp->st_state = MDB_TGT_IDLE; 3263 return (0); 3264 } 3265 3266 switch (state = Pstate(t->t_pshandle)) { 3267 case PS_RUN: 3268 tsp->st_state = MDB_TGT_RUNNING; 3269 break; 3270 3271 case PS_STOP: 3272 tsp->st_state = MDB_TGT_STOPPED; 3273 psp = Pstatus(t->t_pshandle); 3274 3275 tsp->st_tid = PTL_TID(t); 3276 if (PTL_GETREGS(t, tsp->st_tid, gregs) == 0) 3277 tsp->st_pc = gregs[R_PC]; 3278 3279 if (psp->pr_flags & PR_ISTOP) 3280 tsp->st_flags |= MDB_TGT_ISTOP; 3281 if (psp->pr_flags & PR_DSTOP) 3282 tsp->st_flags |= MDB_TGT_DSTOP; 3283 3284 break; 3285 3286 case PS_LOST: 3287 tsp->st_state = MDB_TGT_LOST; 3288 break; 3289 case PS_UNDEAD: 3290 tsp->st_state = MDB_TGT_UNDEAD; 3291 break; 3292 case PS_DEAD: 3293 tsp->st_state = MDB_TGT_DEAD; 3294 break; 3295 case PS_IDLE: 3296 tsp->st_state = MDB_TGT_IDLE; 3297 break; 3298 default: 3299 fail("unknown libproc state (%d)\n", state); 3300 } 3301 3302 if (t->t_flags & MDB_TGT_F_BUSY) 3303 tsp->st_flags |= MDB_TGT_BUSY; 3304 3305 return (0); 3306 } 3307 3308 static void 3309 pt_dupfd(const char *file, int oflags, mode_t mode, int dfd) 3310 { 3311 int fd; 3312 3313 if ((fd = open(file, oflags, mode)) >= 0) { 3314 (void) fcntl(fd, F_DUP2FD, dfd); 3315 (void) close(fd); 3316 } else 3317 warn("failed to open %s as descriptor %d", file, dfd); 3318 } 3319 3320 /* 3321 * The Pcreate_callback() function interposes on the default, empty libproc 3322 * definition. It will be called following a fork of a new child process by 3323 * Pcreate() below, but before the exec of the new process image. We use this 3324 * callback to optionally redirect stdin and stdout and reset the dispositions 3325 * of SIGPIPE and SIGQUIT from SIG_IGN back to SIG_DFL. 3326 */ 3327 /*ARGSUSED*/ 3328 void 3329 Pcreate_callback(struct ps_prochandle *P) 3330 { 3331 pt_data_t *pt = mdb.m_target->t_data; 3332 3333 if (pt->p_stdin != NULL) 3334 pt_dupfd(pt->p_stdin, O_RDWR, 0, STDIN_FILENO); 3335 if (pt->p_stdout != NULL) 3336 pt_dupfd(pt->p_stdout, O_CREAT | O_WRONLY, 0666, STDOUT_FILENO); 3337 3338 (void) mdb_signal_sethandler(SIGPIPE, SIG_DFL, NULL); 3339 (void) mdb_signal_sethandler(SIGQUIT, SIG_DFL, NULL); 3340 } 3341 3342 static int 3343 pt_run(mdb_tgt_t *t, int argc, const mdb_arg_t *argv) 3344 { 3345 pt_data_t *pt = t->t_data; 3346 struct ps_prochandle *P; 3347 char execname[MAXPATHLEN]; 3348 const char **pargv; 3349 int pargc = 0; 3350 int i, perr; 3351 char **penv; 3352 mdb_var_t *v; 3353 3354 if (pt->p_aout_fio == NULL) { 3355 warn("run requires executable to be specified on " 3356 "command-line\n"); 3357 return (set_errno(EMDB_TGT)); 3358 } 3359 3360 pargv = mdb_alloc(sizeof (char *) * (argc + 2), UM_SLEEP); 3361 pargv[pargc++] = strbasename(IOP_NAME(pt->p_aout_fio)); 3362 3363 for (i = 0; i < argc; i++) { 3364 if (argv[i].a_type != MDB_TYPE_STRING) { 3365 mdb_free(pargv, sizeof (char *) * (argc + 2)); 3366 return (set_errno(EINVAL)); 3367 } 3368 if (argv[i].a_un.a_str[0] == '<') 3369 pt->p_stdin = argv[i].a_un.a_str + 1; 3370 else if (argv[i].a_un.a_str[0] == '>') 3371 pt->p_stdout = argv[i].a_un.a_str + 1; 3372 else 3373 pargv[pargc++] = argv[i].a_un.a_str; 3374 } 3375 pargv[pargc] = NULL; 3376 3377 /* 3378 * Since Pcreate() uses execvp() and "." may not be present in $PATH, 3379 * we must manually prepend "./" when the executable is a simple name. 3380 */ 3381 if (strchr(IOP_NAME(pt->p_aout_fio), '/') == NULL) { 3382 (void) snprintf(execname, sizeof (execname), "./%s", 3383 IOP_NAME(pt->p_aout_fio)); 3384 } else { 3385 (void) snprintf(execname, sizeof (execname), "%s", 3386 IOP_NAME(pt->p_aout_fio)); 3387 } 3388 3389 penv = mdb_alloc((mdb_nv_size(&pt->p_env)+ 1) * sizeof (char *), 3390 UM_SLEEP); 3391 for (mdb_nv_rewind(&pt->p_env), i = 0; 3392 (v = mdb_nv_advance(&pt->p_env)) != NULL; i++) 3393 penv[i] = mdb_nv_get_cookie(v); 3394 penv[i] = NULL; 3395 3396 P = Pxcreate(execname, (char **)pargv, penv, &perr, NULL, 0); 3397 mdb_free(pargv, sizeof (char *) * (argc + 2)); 3398 pt->p_stdin = pt->p_stdout = NULL; 3399 3400 mdb_free(penv, i * sizeof (char *)); 3401 3402 if (P == NULL) { 3403 warn("failed to create process: %s\n", Pcreate_error(perr)); 3404 return (set_errno(EMDB_TGT)); 3405 } 3406 3407 if (t->t_pshandle != NULL) { 3408 pt_pre_detach(t, TRUE); 3409 if (t->t_pshandle != pt->p_idlehandle) 3410 Prelease(t->t_pshandle, pt->p_rflags); 3411 } 3412 3413 (void) Punsetflags(P, PR_RLC); /* make sure run-on-last-close is off */ 3414 (void) Psetflags(P, PR_KLC); /* kill on last close by debugger */ 3415 pt->p_rflags = PRELEASE_KILL; /* kill on debugger Prelease */ 3416 t->t_pshandle = P; 3417 3418 pt_post_attach(t); 3419 pt_activate_common(t); 3420 (void) mdb_tgt_status(t, &t->t_status); 3421 mdb.m_flags |= MDB_FL_VCREATE; 3422 3423 return (0); 3424 } 3425 3426 /* 3427 * Forward a signal to the victim process in order to force it to stop or die. 3428 * Refer to the comments above pt_setrun(), below, for more info. 3429 */ 3430 /*ARGSUSED*/ 3431 static void 3432 pt_sigfwd(int sig, siginfo_t *sip, ucontext_t *ucp, mdb_tgt_t *t) 3433 { 3434 struct ps_prochandle *P = t->t_pshandle; 3435 const lwpstatus_t *psp = &Pstatus(P)->pr_lwp; 3436 pid_t pid = Pstatus(P)->pr_pid; 3437 long ctl[2]; 3438 3439 if (getpgid(pid) != mdb.m_pgid) { 3440 mdb_dprintf(MDB_DBG_TGT, "fwd SIG#%d to %d\n", sig, (int)pid); 3441 (void) kill(pid, sig); 3442 } 3443 3444 if (Pwait(P, 1) == 0 && (psp->pr_flags & PR_STOPPED) && 3445 psp->pr_why == PR_JOBCONTROL && Pdstop(P) == 0) { 3446 /* 3447 * If we're job control stopped and our DSTOP is pending, the 3448 * victim will never see our signal, so undo the kill() and 3449 * then send SIGCONT the victim to kick it out of the job 3450 * control stop and force our DSTOP to take effect. 3451 */ 3452 if ((psp->pr_flags & PR_DSTOP) && 3453 prismember(&Pstatus(P)->pr_sigpend, sig)) { 3454 ctl[0] = PCUNKILL; 3455 ctl[1] = sig; 3456 (void) write(Pctlfd(P), ctl, sizeof (ctl)); 3457 } 3458 3459 mdb_dprintf(MDB_DBG_TGT, "fwd SIGCONT to %d\n", (int)pid); 3460 (void) kill(pid, SIGCONT); 3461 } 3462 } 3463 3464 /* 3465 * Common code for step and continue: if no victim process has been created, 3466 * call pt_run() to create one. Then set the victim running, clearing any 3467 * pending fault. One special case is that if the victim was previously 3468 * stopped on reception of SIGINT, we know that SIGINT was traced and the user 3469 * requested the victim to stop, so clear this signal before continuing. 3470 * For all other traced signals, the signal will be delivered on continue. 3471 * 3472 * Once the victim process is running, we wait for it to stop on an event of 3473 * interest. Although libproc provides the basic primitive to wait for the 3474 * victim, we must be careful in our handling of signals. We want to allow the 3475 * user to issue a SIGINT or SIGQUIT using the designated terminal control 3476 * character (typically ^C and ^\), and have these signals stop the target and 3477 * return control to the debugger if the signals are traced. There are three 3478 * cases to be considered in our implementation: 3479 * 3480 * (1) If the debugger and victim are in the same process group, both receive 3481 * the signal from the terminal driver. The debugger returns from Pwait() with 3482 * errno = EINTR, so we want to loop back and continue waiting until the victim 3483 * stops on receipt of its SIGINT or SIGQUIT. 3484 * 3485 * (2) If the debugger and victim are in different process groups, and the 3486 * victim is a member of the foreground process group, it will receive the 3487 * signal from the terminal driver and the debugger will not. As such, we 3488 * will remain blocked in Pwait() until the victim stops on its signal. 3489 * 3490 * (3) If the debugger and victim are in different process groups, and the 3491 * debugger is a member of the foreground process group, it will receive the 3492 * signal from the terminal driver, and the victim will not. The debugger 3493 * returns from Pwait() with errno = EINTR, so we need to forward the signal 3494 * to the victim process directly and then Pwait() again for it to stop. 3495 * 3496 * We can observe that all three cases are handled by simply calling Pwait() 3497 * repeatedly if it fails with EINTR, and forwarding SIGINT and SIGQUIT to 3498 * the victim if it is in a different process group, using pt_sigfwd() above. 3499 * 3500 * An additional complication is that the process may not be able to field 3501 * the signal if it is currently stopped by job control. In this case, we 3502 * also DSTOP the process, and then send it a SIGCONT to wake it up from 3503 * job control and force it to re-enter stop() under the control of /proc. 3504 * 3505 * Finally, we would like to allow the user to suspend the process using the 3506 * terminal suspend character (typically ^Z) if both are in the same session. 3507 * We again employ pt_sigfwd() to forward SIGTSTP to the victim, wait for it to 3508 * stop from job control, and then capture it using /proc. Once the process 3509 * has stopped, normal SIGTSTP processing is restored and the user can issue 3510 * another ^Z in order to suspend the debugger and return to the parent shell. 3511 */ 3512 static int 3513 pt_setrun(mdb_tgt_t *t, mdb_tgt_status_t *tsp, int flags) 3514 { 3515 struct ps_prochandle *P = t->t_pshandle; 3516 pt_data_t *pt = t->t_data; 3517 pid_t old_pgid = -1; 3518 3519 mdb_signal_f *intf, *quitf, *tstpf; 3520 const lwpstatus_t *psp; 3521 void *intd, *quitd, *tstpd; 3522 3523 int sig = pt->p_signal; 3524 int error = 0; 3525 int pgid = -1; 3526 3527 pt->p_signal = 0; /* clear pending signal */ 3528 3529 if (P == NULL && pt_run(t, 0, NULL) == -1) 3530 return (-1); /* errno is set for us */ 3531 3532 P = t->t_pshandle; 3533 psp = &Pstatus(P)->pr_lwp; 3534 3535 if (sig == 0 && psp->pr_why == PR_SIGNALLED && psp->pr_what == SIGINT) 3536 flags |= PRCSIG; /* clear pending SIGINT */ 3537 else 3538 flags |= PRCFAULT; /* clear any pending fault (e.g. BPT) */ 3539 3540 intf = mdb_signal_gethandler(SIGINT, &intd); 3541 quitf = mdb_signal_gethandler(SIGQUIT, &quitd); 3542 tstpf = mdb_signal_gethandler(SIGTSTP, &tstpd); 3543 3544 (void) mdb_signal_sethandler(SIGINT, (mdb_signal_f *)pt_sigfwd, t); 3545 (void) mdb_signal_sethandler(SIGQUIT, (mdb_signal_f *)pt_sigfwd, t); 3546 (void) mdb_signal_sethandler(SIGTSTP, (mdb_signal_f *)pt_sigfwd, t); 3547 3548 if (sig != 0 && Pstate(P) == PS_RUN && 3549 kill(Pstatus(P)->pr_pid, sig) == -1) { 3550 error = errno; 3551 goto out; 3552 } 3553 3554 /* 3555 * If we attached to a job stopped background process in the same 3556 * session, make its pgid the foreground process group before running 3557 * it. Ignore SIGTTOU while doing this to avoid being suspended. 3558 */ 3559 if (mdb.m_flags & MDB_FL_JOBCTL) { 3560 (void) mdb_signal_sethandler(SIGTTOU, SIG_IGN, NULL); 3561 (void) IOP_CTL(mdb.m_term, TIOCGPGRP, &old_pgid); 3562 (void) IOP_CTL(mdb.m_term, TIOCSPGRP, 3563 (void *)&Pstatus(P)->pr_pgid); 3564 (void) mdb_signal_sethandler(SIGTTOU, SIG_DFL, NULL); 3565 } 3566 3567 if (Pstate(P) != PS_RUN && Psetrun(P, sig, flags) == -1) { 3568 error = errno; 3569 goto out; 3570 } 3571 3572 /* 3573 * If the process is stopped on job control, resume its process group 3574 * by sending it a SIGCONT if we are in the same session. Otherwise 3575 * we have no choice but to wait for someone else to foreground it. 3576 */ 3577 if (psp->pr_why == PR_JOBCONTROL) { 3578 if (mdb.m_flags & MDB_FL_JOBCTL) 3579 (void) kill(-Pstatus(P)->pr_pgid, SIGCONT); 3580 else if (mdb.m_term != NULL) 3581 warn("process is still suspended by job control ...\n"); 3582 } 3583 3584 /* 3585 * Wait for the process to stop. As described above, we loop around if 3586 * we are interrupted (EINTR). If we lose control, attempt to re-open 3587 * the process, or call pt_exec() if that fails to handle a re-exec. 3588 * If the process dies (ENOENT) or Pwait() fails, break out of the loop. 3589 */ 3590 while (Pwait(P, 0) == -1) { 3591 if (errno != EINTR) { 3592 if (Pstate(P) == PS_LOST) { 3593 if (Preopen(P) == 0) 3594 continue; /* Pwait() again */ 3595 else 3596 pt_exec(t, 0, NULL); 3597 } else if (errno != ENOENT) 3598 warn("failed to wait for event"); 3599 break; 3600 } 3601 } 3602 3603 /* 3604 * If we changed the foreground process group, restore the old pgid 3605 * while ignoring SIGTTOU so we are not accidentally suspended. 3606 */ 3607 if (old_pgid != -1) { 3608 (void) mdb_signal_sethandler(SIGTTOU, SIG_IGN, NULL); 3609 (void) IOP_CTL(mdb.m_term, TIOCSPGRP, &pgid); 3610 (void) mdb_signal_sethandler(SIGTTOU, SIG_DFL, NULL); 3611 } 3612 3613 /* 3614 * If we're now stopped on exit from a successful exec, release any 3615 * vfork parents and clean out their address space before returning 3616 * to tgt_continue() and perturbing the list of armed event specs. 3617 * If we're stopped for any other reason, just update the mappings. 3618 */ 3619 switch (Pstate(P)) { 3620 case PS_STOP: 3621 if (psp->pr_why == PR_SYSEXIT && psp->pr_errno == 0 && 3622 psp->pr_what == SYS_execve) 3623 pt_release_parents(t); 3624 else 3625 Pupdate_maps(P); 3626 break; 3627 3628 case PS_UNDEAD: 3629 case PS_LOST: 3630 pt_release_parents(t); 3631 break; 3632 } 3633 3634 out: 3635 (void) mdb_signal_sethandler(SIGINT, intf, intd); 3636 (void) mdb_signal_sethandler(SIGQUIT, quitf, quitd); 3637 (void) mdb_signal_sethandler(SIGTSTP, tstpf, tstpd); 3638 (void) pt_status(t, tsp); 3639 3640 return (error ? set_errno(error) : 0); 3641 } 3642 3643 static int 3644 pt_step(mdb_tgt_t *t, mdb_tgt_status_t *tsp) 3645 { 3646 return (pt_setrun(t, tsp, PRSTEP)); 3647 } 3648 3649 static int 3650 pt_continue(mdb_tgt_t *t, mdb_tgt_status_t *tsp) 3651 { 3652 return (pt_setrun(t, tsp, 0)); 3653 } 3654 3655 static int 3656 pt_signal(mdb_tgt_t *t, int sig) 3657 { 3658 pt_data_t *pt = t->t_data; 3659 3660 if (sig > 0 && sig <= pt->p_maxsig) { 3661 pt->p_signal = sig; /* pending until next pt_setrun */ 3662 return (0); 3663 } 3664 3665 return (set_errno(EMDB_BADSIGNUM)); 3666 } 3667 3668 static int 3669 pt_sysenter_ctor(mdb_tgt_t *t, mdb_sespec_t *sep, void *args) 3670 { 3671 struct ps_prochandle *P = t->t_pshandle; 3672 3673 if (P != NULL && Pstate(P) < PS_LOST) { 3674 sep->se_data = args; /* data is raw system call number */ 3675 return (Psysentry(P, (intptr_t)args, TRUE) < 0 ? -1 : 0); 3676 } 3677 3678 return (set_errno(EMDB_NOPROC)); 3679 } 3680 3681 static void 3682 pt_sysenter_dtor(mdb_tgt_t *t, mdb_sespec_t *sep) 3683 { 3684 (void) Psysentry(t->t_pshandle, (intptr_t)sep->se_data, FALSE); 3685 } 3686 3687 /*ARGSUSED*/ 3688 static char * 3689 pt_sysenter_info(mdb_tgt_t *t, mdb_sespec_t *sep, mdb_vespec_t *vep, 3690 mdb_tgt_spec_desc_t *sp, char *buf, size_t nbytes) 3691 { 3692 char name[32]; 3693 int sysnum; 3694 3695 if (vep != NULL) 3696 sysnum = (intptr_t)vep->ve_args; 3697 else 3698 sysnum = (intptr_t)sep->se_data; 3699 3700 (void) proc_sysname(sysnum, name, sizeof (name)); 3701 (void) mdb_iob_snprintf(buf, nbytes, "stop on entry to %s", name); 3702 3703 return (buf); 3704 } 3705 3706 /*ARGSUSED*/ 3707 static int 3708 pt_sysenter_match(mdb_tgt_t *t, mdb_sespec_t *sep, mdb_tgt_status_t *tsp) 3709 { 3710 const lwpstatus_t *psp = &Pstatus(t->t_pshandle)->pr_lwp; 3711 int sysnum = (intptr_t)sep->se_data; 3712 3713 return (psp->pr_why == PR_SYSENTRY && psp->pr_what == sysnum); 3714 } 3715 3716 static const mdb_se_ops_t proc_sysenter_ops = { 3717 pt_sysenter_ctor, /* se_ctor */ 3718 pt_sysenter_dtor, /* se_dtor */ 3719 pt_sysenter_info, /* se_info */ 3720 no_se_secmp, /* se_secmp */ 3721 no_se_vecmp, /* se_vecmp */ 3722 no_se_arm, /* se_arm */ 3723 no_se_disarm, /* se_disarm */ 3724 no_se_cont, /* se_cont */ 3725 pt_sysenter_match /* se_match */ 3726 }; 3727 3728 static int 3729 pt_sysexit_ctor(mdb_tgt_t *t, mdb_sespec_t *sep, void *args) 3730 { 3731 struct ps_prochandle *P = t->t_pshandle; 3732 3733 if (P != NULL && Pstate(P) < PS_LOST) { 3734 sep->se_data = args; /* data is raw system call number */ 3735 return (Psysexit(P, (intptr_t)args, TRUE) < 0 ? -1 : 0); 3736 } 3737 3738 return (set_errno(EMDB_NOPROC)); 3739 } 3740 3741 static void 3742 pt_sysexit_dtor(mdb_tgt_t *t, mdb_sespec_t *sep) 3743 { 3744 (void) Psysexit(t->t_pshandle, (intptr_t)sep->se_data, FALSE); 3745 } 3746 3747 /*ARGSUSED*/ 3748 static char * 3749 pt_sysexit_info(mdb_tgt_t *t, mdb_sespec_t *sep, mdb_vespec_t *vep, 3750 mdb_tgt_spec_desc_t *sp, char *buf, size_t nbytes) 3751 { 3752 char name[32]; 3753 int sysnum; 3754 3755 if (vep != NULL) 3756 sysnum = (intptr_t)vep->ve_args; 3757 else 3758 sysnum = (intptr_t)sep->se_data; 3759 3760 (void) proc_sysname(sysnum, name, sizeof (name)); 3761 (void) mdb_iob_snprintf(buf, nbytes, "stop on exit from %s", name); 3762 3763 return (buf); 3764 } 3765 3766 /*ARGSUSED*/ 3767 static int 3768 pt_sysexit_match(mdb_tgt_t *t, mdb_sespec_t *sep, mdb_tgt_status_t *tsp) 3769 { 3770 const lwpstatus_t *psp = &Pstatus(t->t_pshandle)->pr_lwp; 3771 int sysnum = (intptr_t)sep->se_data; 3772 3773 return (psp->pr_why == PR_SYSEXIT && psp->pr_what == sysnum); 3774 } 3775 3776 static const mdb_se_ops_t proc_sysexit_ops = { 3777 pt_sysexit_ctor, /* se_ctor */ 3778 pt_sysexit_dtor, /* se_dtor */ 3779 pt_sysexit_info, /* se_info */ 3780 no_se_secmp, /* se_secmp */ 3781 no_se_vecmp, /* se_vecmp */ 3782 no_se_arm, /* se_arm */ 3783 no_se_disarm, /* se_disarm */ 3784 no_se_cont, /* se_cont */ 3785 pt_sysexit_match /* se_match */ 3786 }; 3787 3788 static int 3789 pt_signal_ctor(mdb_tgt_t *t, mdb_sespec_t *sep, void *args) 3790 { 3791 struct ps_prochandle *P = t->t_pshandle; 3792 3793 if (P != NULL && Pstate(P) < PS_LOST) { 3794 sep->se_data = args; /* data is raw signal number */ 3795 return (Psignal(P, (intptr_t)args, TRUE) < 0 ? -1 : 0); 3796 } 3797 3798 return (set_errno(EMDB_NOPROC)); 3799 } 3800 3801 static void 3802 pt_signal_dtor(mdb_tgt_t *t, mdb_sespec_t *sep) 3803 { 3804 (void) Psignal(t->t_pshandle, (intptr_t)sep->se_data, FALSE); 3805 } 3806 3807 /*ARGSUSED*/ 3808 static char * 3809 pt_signal_info(mdb_tgt_t *t, mdb_sespec_t *sep, mdb_vespec_t *vep, 3810 mdb_tgt_spec_desc_t *sp, char *buf, size_t nbytes) 3811 { 3812 char name[SIG2STR_MAX]; 3813 int signum; 3814 3815 if (vep != NULL) 3816 signum = (intptr_t)vep->ve_args; 3817 else 3818 signum = (intptr_t)sep->se_data; 3819 3820 (void) proc_signame(signum, name, sizeof (name)); 3821 (void) mdb_iob_snprintf(buf, nbytes, "stop on %s", name); 3822 3823 return (buf); 3824 } 3825 3826 /*ARGSUSED*/ 3827 static int 3828 pt_signal_match(mdb_tgt_t *t, mdb_sespec_t *sep, mdb_tgt_status_t *tsp) 3829 { 3830 const lwpstatus_t *psp = &Pstatus(t->t_pshandle)->pr_lwp; 3831 int signum = (intptr_t)sep->se_data; 3832 3833 return (psp->pr_why == PR_SIGNALLED && psp->pr_what == signum); 3834 } 3835 3836 static const mdb_se_ops_t proc_signal_ops = { 3837 pt_signal_ctor, /* se_ctor */ 3838 pt_signal_dtor, /* se_dtor */ 3839 pt_signal_info, /* se_info */ 3840 no_se_secmp, /* se_secmp */ 3841 no_se_vecmp, /* se_vecmp */ 3842 no_se_arm, /* se_arm */ 3843 no_se_disarm, /* se_disarm */ 3844 no_se_cont, /* se_cont */ 3845 pt_signal_match /* se_match */ 3846 }; 3847 3848 static int 3849 pt_fault_ctor(mdb_tgt_t *t, mdb_sespec_t *sep, void *args) 3850 { 3851 struct ps_prochandle *P = t->t_pshandle; 3852 3853 if (P != NULL && Pstate(P) < PS_LOST) { 3854 sep->se_data = args; /* data is raw fault number */ 3855 return (Pfault(P, (intptr_t)args, TRUE) < 0 ? -1 : 0); 3856 } 3857 3858 return (set_errno(EMDB_NOPROC)); 3859 } 3860 3861 static void 3862 pt_fault_dtor(mdb_tgt_t *t, mdb_sespec_t *sep) 3863 { 3864 int fault = (intptr_t)sep->se_data; 3865 3866 if (fault != FLTBPT && fault != FLTTRACE && fault != FLTWATCH) 3867 (void) Pfault(t->t_pshandle, fault, FALSE); 3868 } 3869 3870 /*ARGSUSED*/ 3871 static char * 3872 pt_fault_info(mdb_tgt_t *t, mdb_sespec_t *sep, mdb_vespec_t *vep, 3873 mdb_tgt_spec_desc_t *sp, char *buf, size_t nbytes) 3874 { 3875 char name[32]; 3876 int fltnum; 3877 3878 if (vep != NULL) 3879 fltnum = (intptr_t)vep->ve_args; 3880 else 3881 fltnum = (intptr_t)sep->se_data; 3882 3883 (void) proc_fltname(fltnum, name, sizeof (name)); 3884 (void) mdb_iob_snprintf(buf, nbytes, "stop on %s", name); 3885 3886 return (buf); 3887 } 3888 3889 /*ARGSUSED*/ 3890 static int 3891 pt_fault_match(mdb_tgt_t *t, mdb_sespec_t *sep, mdb_tgt_status_t *tsp) 3892 { 3893 const lwpstatus_t *psp = &Pstatus(t->t_pshandle)->pr_lwp; 3894 int fltnum = (intptr_t)sep->se_data; 3895 3896 return (psp->pr_why == PR_FAULTED && psp->pr_what == fltnum); 3897 } 3898 3899 static const mdb_se_ops_t proc_fault_ops = { 3900 pt_fault_ctor, /* se_ctor */ 3901 pt_fault_dtor, /* se_dtor */ 3902 pt_fault_info, /* se_info */ 3903 no_se_secmp, /* se_secmp */ 3904 no_se_vecmp, /* se_vecmp */ 3905 no_se_arm, /* se_arm */ 3906 no_se_disarm, /* se_disarm */ 3907 no_se_cont, /* se_cont */ 3908 pt_fault_match /* se_match */ 3909 }; 3910 3911 /* 3912 * Callback for pt_ignore() dcmd above: for each VID, determine if it 3913 * corresponds to a vespec that traces the specified signal, and delete it. 3914 */ 3915 /*ARGSUSED*/ 3916 static int 3917 pt_ignore_sig(mdb_tgt_t *t, void *sig, int vid, void *data) 3918 { 3919 mdb_vespec_t *vep = mdb_tgt_vespec_lookup(t, vid); 3920 3921 if (vep->ve_se->se_ops == &proc_signal_ops && vep->ve_args == sig) 3922 (void) mdb_tgt_vespec_delete(t, vid); 3923 3924 return (0); 3925 } 3926 3927 static int 3928 pt_brkpt_ctor(mdb_tgt_t *t, mdb_sespec_t *sep, void *args) 3929 { 3930 pt_data_t *pt = t->t_data; 3931 pt_bparg_t *pta = args; 3932 pt_brkpt_t *ptb; 3933 GElf_Sym s; 3934 3935 if (t->t_pshandle == NULL || Pstate(t->t_pshandle) >= PS_LOST) 3936 return (set_errno(EMDB_NOPROC)); 3937 3938 if (pta->pta_symbol != NULL) { 3939 if (!pt->p_rtld_finished && 3940 strchr(pta->pta_symbol, '`') == NULL) 3941 return (set_errno(EMDB_NOSYM)); 3942 if (mdb_tgt_lookup_by_scope(t, pta->pta_symbol, &s, 3943 NULL) == -1) { 3944 if (errno != EMDB_NOOBJ && !(errno == EMDB_NOSYM && 3945 (!(mdb.m_flags & MDB_FL_BPTNOSYMSTOP) || 3946 !pt->p_rtld_finished))) { 3947 warn("breakpoint %s activation failed", 3948 pta->pta_symbol); 3949 } 3950 return (-1); /* errno is set for us */ 3951 } 3952 3953 pta->pta_addr = (uintptr_t)s.st_value; 3954 } 3955 3956 #ifdef __sparc 3957 if (pta->pta_addr & 3) 3958 return (set_errno(EMDB_BPALIGN)); 3959 #endif 3960 3961 if (Paddr_to_map(t->t_pshandle, pta->pta_addr) == NULL) 3962 return (set_errno(EMDB_NOMAP)); 3963 3964 ptb = mdb_alloc(sizeof (pt_brkpt_t), UM_SLEEP); 3965 ptb->ptb_addr = pta->pta_addr; 3966 ptb->ptb_instr = NULL; 3967 sep->se_data = ptb; 3968 3969 return (0); 3970 } 3971 3972 /*ARGSUSED*/ 3973 static void 3974 pt_brkpt_dtor(mdb_tgt_t *t, mdb_sespec_t *sep) 3975 { 3976 mdb_free(sep->se_data, sizeof (pt_brkpt_t)); 3977 } 3978 3979 /*ARGSUSED*/ 3980 static char * 3981 pt_brkpt_info(mdb_tgt_t *t, mdb_sespec_t *sep, mdb_vespec_t *vep, 3982 mdb_tgt_spec_desc_t *sp, char *buf, size_t nbytes) 3983 { 3984 uintptr_t addr = NULL; 3985 3986 if (vep != NULL) { 3987 pt_bparg_t *pta = vep->ve_args; 3988 3989 if (pta->pta_symbol != NULL) { 3990 (void) mdb_iob_snprintf(buf, nbytes, "stop at %s", 3991 pta->pta_symbol); 3992 } else { 3993 (void) mdb_iob_snprintf(buf, nbytes, "stop at %a", 3994 pta->pta_addr); 3995 addr = pta->pta_addr; 3996 } 3997 3998 } else { 3999 addr = ((pt_brkpt_t *)sep->se_data)->ptb_addr; 4000 (void) mdb_iob_snprintf(buf, nbytes, "stop at %a", addr); 4001 } 4002 4003 sp->spec_base = addr; 4004 sp->spec_size = sizeof (instr_t); 4005 4006 return (buf); 4007 } 4008 4009 static int 4010 pt_brkpt_secmp(mdb_tgt_t *t, mdb_sespec_t *sep, void *args) 4011 { 4012 pt_brkpt_t *ptb = sep->se_data; 4013 pt_bparg_t *pta = args; 4014 GElf_Sym sym; 4015 4016 if (pta->pta_symbol != NULL) { 4017 return (mdb_tgt_lookup_by_scope(t, pta->pta_symbol, 4018 &sym, NULL) == 0 && sym.st_value == ptb->ptb_addr); 4019 } 4020 4021 return (pta->pta_addr == ptb->ptb_addr); 4022 } 4023 4024 /*ARGSUSED*/ 4025 static int 4026 pt_brkpt_vecmp(mdb_tgt_t *t, mdb_vespec_t *vep, void *args) 4027 { 4028 pt_bparg_t *pta1 = vep->ve_args; 4029 pt_bparg_t *pta2 = args; 4030 4031 if (pta1->pta_symbol != NULL && pta2->pta_symbol != NULL) 4032 return (strcmp(pta1->pta_symbol, pta2->pta_symbol) == 0); 4033 4034 if (pta1->pta_symbol == NULL && pta2->pta_symbol == NULL) 4035 return (pta1->pta_addr == pta2->pta_addr); 4036 4037 return (0); /* fail if one is symbolic, other is an explicit address */ 4038 } 4039 4040 static int 4041 pt_brkpt_arm(mdb_tgt_t *t, mdb_sespec_t *sep) 4042 { 4043 pt_brkpt_t *ptb = sep->se_data; 4044 return (Psetbkpt(t->t_pshandle, ptb->ptb_addr, &ptb->ptb_instr)); 4045 } 4046 4047 /* 4048 * In order to disarm a breakpoint, we replace the trap instruction at ptb_addr 4049 * with the saved instruction. However, if we have stopped after a successful 4050 * exec(2), we do not want to restore ptb_instr because the address space has 4051 * now been replaced with the text of a different executable, and so restoring 4052 * the saved instruction would be incorrect. The exec itself has effectively 4053 * removed all breakpoint trap instructions for us, so we can just return. 4054 */ 4055 static int 4056 pt_brkpt_disarm(mdb_tgt_t *t, mdb_sespec_t *sep) 4057 { 4058 const lwpstatus_t *psp = &Pstatus(t->t_pshandle)->pr_lwp; 4059 pt_brkpt_t *ptb = sep->se_data; 4060 4061 if (psp->pr_why == PR_SYSEXIT && psp->pr_errno == 0 && 4062 psp->pr_what == SYS_execve) 4063 return (0); /* do not restore saved instruction */ 4064 4065 return (Pdelbkpt(t->t_pshandle, ptb->ptb_addr, ptb->ptb_instr)); 4066 } 4067 4068 /* 4069 * Determine whether the specified sespec is an armed watchpoint that overlaps 4070 * with the given breakpoint and has the given flags set. We use this to find 4071 * conflicts with breakpoints, below. 4072 */ 4073 static int 4074 pt_wp_overlap(mdb_sespec_t *sep, pt_brkpt_t *ptb, int flags) 4075 { 4076 const prwatch_t *wp = sep->se_data; 4077 4078 return (sep->se_state == MDB_TGT_SPEC_ARMED && 4079 sep->se_ops == &proc_wapt_ops && (wp->pr_wflags & flags) && 4080 ptb->ptb_addr - wp->pr_vaddr < wp->pr_size); 4081 } 4082 4083 /* 4084 * We step over breakpoints using Pxecbkpt() in libproc. If a conflicting 4085 * watchpoint is present, we must temporarily remove it before stepping over 4086 * the breakpoint so we do not immediately re-trigger the watchpoint. We know 4087 * the watchpoint has already triggered on our trap instruction as part of 4088 * fetching it. Before we return, we must re-install any disabled watchpoints. 4089 */ 4090 static int 4091 pt_brkpt_cont(mdb_tgt_t *t, mdb_sespec_t *sep, mdb_tgt_status_t *tsp) 4092 { 4093 pt_brkpt_t *ptb = sep->se_data; 4094 int status = -1; 4095 int error; 4096 const lwpstatus_t *psp = &Pstatus(t->t_pshandle)->pr_lwp; 4097 4098 /* 4099 * If the PC no longer matches our original address, then the user has 4100 * changed it while we have been stopped. In this case, it no longer 4101 * makes any sense to continue over this breakpoint. We return as if we 4102 * continued normally. 4103 */ 4104 if ((uintptr_t)psp->pr_info.si_addr != psp->pr_reg[R_PC]) 4105 return (pt_status(t, tsp)); 4106 4107 for (sep = mdb_list_next(&t->t_active); sep; sep = mdb_list_next(sep)) { 4108 if (pt_wp_overlap(sep, ptb, WA_EXEC)) 4109 (void) Pdelwapt(t->t_pshandle, sep->se_data); 4110 } 4111 4112 if (Pxecbkpt(t->t_pshandle, ptb->ptb_instr) == 0 && 4113 Pdelbkpt(t->t_pshandle, ptb->ptb_addr, ptb->ptb_instr) == 0) 4114 status = pt_status(t, tsp); 4115 4116 error = errno; /* save errno from Pxecbkpt, Pdelbkpt, or pt_status */ 4117 4118 for (sep = mdb_list_next(&t->t_active); sep; sep = mdb_list_next(sep)) { 4119 if (pt_wp_overlap(sep, ptb, WA_EXEC) && 4120 Psetwapt(t->t_pshandle, sep->se_data) == -1) { 4121 sep->se_state = MDB_TGT_SPEC_ERROR; 4122 sep->se_errno = errno; 4123 } 4124 } 4125 4126 (void) set_errno(error); 4127 return (status); 4128 } 4129 4130 /*ARGSUSED*/ 4131 static int 4132 pt_brkpt_match(mdb_tgt_t *t, mdb_sespec_t *sep, mdb_tgt_status_t *tsp) 4133 { 4134 const lwpstatus_t *psp = &Pstatus(t->t_pshandle)->pr_lwp; 4135 pt_brkpt_t *ptb = sep->se_data; 4136 4137 return (psp->pr_why == PR_FAULTED && psp->pr_what == FLTBPT && 4138 psp->pr_reg[R_PC] == ptb->ptb_addr); 4139 } 4140 4141 static const mdb_se_ops_t proc_brkpt_ops = { 4142 pt_brkpt_ctor, /* se_ctor */ 4143 pt_brkpt_dtor, /* se_dtor */ 4144 pt_brkpt_info, /* se_info */ 4145 pt_brkpt_secmp, /* se_secmp */ 4146 pt_brkpt_vecmp, /* se_vecmp */ 4147 pt_brkpt_arm, /* se_arm */ 4148 pt_brkpt_disarm, /* se_disarm */ 4149 pt_brkpt_cont, /* se_cont */ 4150 pt_brkpt_match /* se_match */ 4151 }; 4152 4153 static int 4154 pt_wapt_ctor(mdb_tgt_t *t, mdb_sespec_t *sep, void *args) 4155 { 4156 if (t->t_pshandle == NULL || Pstate(t->t_pshandle) >= PS_LOST) 4157 return (set_errno(EMDB_NOPROC)); 4158 4159 sep->se_data = mdb_alloc(sizeof (prwatch_t), UM_SLEEP); 4160 bcopy(args, sep->se_data, sizeof (prwatch_t)); 4161 return (0); 4162 } 4163 4164 /*ARGSUSED*/ 4165 static void 4166 pt_wapt_dtor(mdb_tgt_t *t, mdb_sespec_t *sep) 4167 { 4168 mdb_free(sep->se_data, sizeof (prwatch_t)); 4169 } 4170 4171 /*ARGSUSED*/ 4172 static char * 4173 pt_wapt_info(mdb_tgt_t *t, mdb_sespec_t *sep, mdb_vespec_t *vep, 4174 mdb_tgt_spec_desc_t *sp, char *buf, size_t nbytes) 4175 { 4176 prwatch_t *wp = vep != NULL ? vep->ve_args : sep->se_data; 4177 char desc[24]; 4178 4179 ASSERT(wp->pr_wflags != 0); 4180 desc[0] = '\0'; 4181 4182 switch (wp->pr_wflags) { 4183 case WA_READ: 4184 (void) strcat(desc, "/read"); 4185 break; 4186 case WA_WRITE: 4187 (void) strcat(desc, "/write"); 4188 break; 4189 case WA_EXEC: 4190 (void) strcat(desc, "/exec"); 4191 break; 4192 default: 4193 if (wp->pr_wflags & WA_READ) 4194 (void) strcat(desc, "/r"); 4195 if (wp->pr_wflags & WA_WRITE) 4196 (void) strcat(desc, "/w"); 4197 if (wp->pr_wflags & WA_EXEC) 4198 (void) strcat(desc, "/x"); 4199 } 4200 4201 (void) mdb_iob_snprintf(buf, nbytes, "stop on %s of [%la, %la)", 4202 desc + 1, wp->pr_vaddr, wp->pr_vaddr + wp->pr_size); 4203 4204 sp->spec_base = wp->pr_vaddr; 4205 sp->spec_size = wp->pr_size; 4206 4207 return (buf); 4208 } 4209 4210 /*ARGSUSED*/ 4211 static int 4212 pt_wapt_secmp(mdb_tgt_t *t, mdb_sespec_t *sep, void *args) 4213 { 4214 prwatch_t *wp1 = sep->se_data; 4215 prwatch_t *wp2 = args; 4216 4217 return (wp1->pr_vaddr == wp2->pr_vaddr && 4218 wp1->pr_size == wp2->pr_size && wp1->pr_wflags == wp2->pr_wflags); 4219 } 4220 4221 /*ARGSUSED*/ 4222 static int 4223 pt_wapt_vecmp(mdb_tgt_t *t, mdb_vespec_t *vep, void *args) 4224 { 4225 prwatch_t *wp1 = vep->ve_args; 4226 prwatch_t *wp2 = args; 4227 4228 return (wp1->pr_vaddr == wp2->pr_vaddr && 4229 wp1->pr_size == wp2->pr_size && wp1->pr_wflags == wp2->pr_wflags); 4230 } 4231 4232 static int 4233 pt_wapt_arm(mdb_tgt_t *t, mdb_sespec_t *sep) 4234 { 4235 return (Psetwapt(t->t_pshandle, sep->se_data)); 4236 } 4237 4238 static int 4239 pt_wapt_disarm(mdb_tgt_t *t, mdb_sespec_t *sep) 4240 { 4241 return (Pdelwapt(t->t_pshandle, sep->se_data)); 4242 } 4243 4244 /* 4245 * Determine whether the specified sespec is an armed breakpoint at the 4246 * given %pc. We use this to find conflicts with watchpoints below. 4247 */ 4248 static int 4249 pt_bp_overlap(mdb_sespec_t *sep, uintptr_t pc) 4250 { 4251 pt_brkpt_t *ptb = sep->se_data; 4252 4253 return (sep->se_state == MDB_TGT_SPEC_ARMED && 4254 sep->se_ops == &proc_brkpt_ops && ptb->ptb_addr == pc); 4255 } 4256 4257 /* 4258 * We step over watchpoints using Pxecwapt() in libproc. If a conflicting 4259 * breakpoint is present, we must temporarily disarm it before stepping 4260 * over the watchpoint so we do not immediately re-trigger the breakpoint. 4261 * This is similar to the case handled in pt_brkpt_cont(), above. 4262 */ 4263 static int 4264 pt_wapt_cont(mdb_tgt_t *t, mdb_sespec_t *sep, mdb_tgt_status_t *tsp) 4265 { 4266 const lwpstatus_t *psp = &Pstatus(t->t_pshandle)->pr_lwp; 4267 mdb_sespec_t *bep = NULL; 4268 int status = -1; 4269 int error; 4270 4271 /* 4272 * If the PC no longer matches our original address, then the user has 4273 * changed it while we have been stopped. In this case, it no longer 4274 * makes any sense to continue over this instruction. We return as if 4275 * we continued normally. 4276 */ 4277 if ((uintptr_t)psp->pr_info.si_pc != psp->pr_reg[R_PC]) 4278 return (pt_status(t, tsp)); 4279 4280 if (psp->pr_info.si_code != TRAP_XWATCH) { 4281 for (bep = mdb_list_next(&t->t_active); bep != NULL; 4282 bep = mdb_list_next(bep)) { 4283 if (pt_bp_overlap(bep, psp->pr_reg[R_PC])) { 4284 (void) bep->se_ops->se_disarm(t, bep); 4285 bep->se_state = MDB_TGT_SPEC_ACTIVE; 4286 break; 4287 } 4288 } 4289 } 4290 4291 if (Pxecwapt(t->t_pshandle, sep->se_data) == 0) 4292 status = pt_status(t, tsp); 4293 4294 error = errno; /* save errno from Pxecwapt or pt_status */ 4295 4296 if (bep != NULL) 4297 mdb_tgt_sespec_arm_one(t, bep); 4298 4299 (void) set_errno(error); 4300 return (status); 4301 } 4302 4303 /*ARGSUSED*/ 4304 static int 4305 pt_wapt_match(mdb_tgt_t *t, mdb_sespec_t *sep, mdb_tgt_status_t *tsp) 4306 { 4307 const lwpstatus_t *psp = &Pstatus(t->t_pshandle)->pr_lwp; 4308 prwatch_t *wp = sep->se_data; 4309 4310 return (psp->pr_why == PR_FAULTED && psp->pr_what == FLTWATCH && 4311 (uintptr_t)psp->pr_info.si_addr - wp->pr_vaddr < wp->pr_size); 4312 } 4313 4314 static const mdb_se_ops_t proc_wapt_ops = { 4315 pt_wapt_ctor, /* se_ctor */ 4316 pt_wapt_dtor, /* se_dtor */ 4317 pt_wapt_info, /* se_info */ 4318 pt_wapt_secmp, /* se_secmp */ 4319 pt_wapt_vecmp, /* se_vecmp */ 4320 pt_wapt_arm, /* se_arm */ 4321 pt_wapt_disarm, /* se_disarm */ 4322 pt_wapt_cont, /* se_cont */ 4323 pt_wapt_match /* se_match */ 4324 }; 4325 4326 static void 4327 pt_bparg_dtor(mdb_vespec_t *vep) 4328 { 4329 pt_bparg_t *pta = vep->ve_args; 4330 4331 if (pta->pta_symbol != NULL) 4332 strfree(pta->pta_symbol); 4333 4334 mdb_free(pta, sizeof (pt_bparg_t)); 4335 } 4336 4337 static int 4338 pt_add_vbrkpt(mdb_tgt_t *t, uintptr_t addr, 4339 int spec_flags, mdb_tgt_se_f *func, void *data) 4340 { 4341 pt_bparg_t *pta = mdb_alloc(sizeof (pt_bparg_t), UM_SLEEP); 4342 4343 pta->pta_symbol = NULL; 4344 pta->pta_addr = addr; 4345 4346 return (mdb_tgt_vespec_insert(t, &proc_brkpt_ops, spec_flags, 4347 func, data, pta, pt_bparg_dtor)); 4348 } 4349 4350 static int 4351 pt_add_sbrkpt(mdb_tgt_t *t, const char *sym, 4352 int spec_flags, mdb_tgt_se_f *func, void *data) 4353 { 4354 pt_bparg_t *pta; 4355 4356 if (sym[0] == '`') { 4357 (void) set_errno(EMDB_NOOBJ); 4358 return (0); 4359 } 4360 4361 if (sym[strlen(sym) - 1] == '`') { 4362 (void) set_errno(EMDB_NOSYM); 4363 return (0); 4364 } 4365 4366 pta = mdb_alloc(sizeof (pt_bparg_t), UM_SLEEP); 4367 pta->pta_symbol = strdup(sym); 4368 pta->pta_addr = NULL; 4369 4370 return (mdb_tgt_vespec_insert(t, &proc_brkpt_ops, spec_flags, 4371 func, data, pta, pt_bparg_dtor)); 4372 } 4373 4374 static int 4375 pt_wparg_overlap(const prwatch_t *wp1, const prwatch_t *wp2) 4376 { 4377 if (wp2->pr_vaddr + wp2->pr_size <= wp1->pr_vaddr) 4378 return (0); /* no range overlap */ 4379 4380 if (wp1->pr_vaddr + wp1->pr_size <= wp2->pr_vaddr) 4381 return (0); /* no range overlap */ 4382 4383 return (wp1->pr_vaddr != wp2->pr_vaddr || 4384 wp1->pr_size != wp2->pr_size || wp1->pr_wflags != wp2->pr_wflags); 4385 } 4386 4387 static void 4388 pt_wparg_dtor(mdb_vespec_t *vep) 4389 { 4390 mdb_free(vep->ve_args, sizeof (prwatch_t)); 4391 } 4392 4393 static int 4394 pt_add_vwapt(mdb_tgt_t *t, uintptr_t addr, size_t len, uint_t wflags, 4395 int spec_flags, mdb_tgt_se_f *func, void *data) 4396 { 4397 prwatch_t *wp = mdb_alloc(sizeof (prwatch_t), UM_SLEEP); 4398 mdb_sespec_t *sep; 4399 4400 wp->pr_vaddr = addr; 4401 wp->pr_size = len; 4402 wp->pr_wflags = 0; 4403 4404 if (wflags & MDB_TGT_WA_R) 4405 wp->pr_wflags |= WA_READ; 4406 if (wflags & MDB_TGT_WA_W) 4407 wp->pr_wflags |= WA_WRITE; 4408 if (wflags & MDB_TGT_WA_X) 4409 wp->pr_wflags |= WA_EXEC; 4410 4411 for (sep = mdb_list_next(&t->t_active); sep; sep = mdb_list_next(sep)) { 4412 if (sep->se_ops == &proc_wapt_ops && 4413 mdb_list_next(&sep->se_velist) != NULL && 4414 pt_wparg_overlap(wp, sep->se_data)) 4415 goto dup; 4416 } 4417 4418 for (sep = mdb_list_next(&t->t_idle); sep; sep = mdb_list_next(sep)) { 4419 if (sep->se_ops == &proc_wapt_ops && pt_wparg_overlap(wp, 4420 ((mdb_vespec_t *)mdb_list_next(&sep->se_velist))->ve_args)) 4421 goto dup; 4422 } 4423 4424 return (mdb_tgt_vespec_insert(t, &proc_wapt_ops, spec_flags, 4425 func, data, wp, pt_wparg_dtor)); 4426 4427 dup: 4428 mdb_free(wp, sizeof (prwatch_t)); 4429 (void) set_errno(EMDB_WPDUP); 4430 return (0); 4431 } 4432 4433 static int 4434 pt_add_sysenter(mdb_tgt_t *t, int sysnum, 4435 int spec_flags, mdb_tgt_se_f *func, void *data) 4436 { 4437 if (sysnum <= 0 || sysnum > PRMAXSYS) { 4438 (void) set_errno(EMDB_BADSYSNUM); 4439 return (0); 4440 } 4441 4442 return (mdb_tgt_vespec_insert(t, &proc_sysenter_ops, spec_flags, 4443 func, data, (void *)(uintptr_t)sysnum, no_ve_dtor)); 4444 } 4445 4446 static int 4447 pt_add_sysexit(mdb_tgt_t *t, int sysnum, 4448 int spec_flags, mdb_tgt_se_f *func, void *data) 4449 { 4450 if (sysnum <= 0 || sysnum > PRMAXSYS) { 4451 (void) set_errno(EMDB_BADSYSNUM); 4452 return (0); 4453 } 4454 4455 return (mdb_tgt_vespec_insert(t, &proc_sysexit_ops, spec_flags, 4456 func, data, (void *)(uintptr_t)sysnum, no_ve_dtor)); 4457 } 4458 4459 static int 4460 pt_add_signal(mdb_tgt_t *t, int signum, 4461 int spec_flags, mdb_tgt_se_f *func, void *data) 4462 { 4463 pt_data_t *pt = t->t_data; 4464 4465 if (signum <= 0 || signum > pt->p_maxsig) { 4466 (void) set_errno(EMDB_BADSIGNUM); 4467 return (0); 4468 } 4469 4470 return (mdb_tgt_vespec_insert(t, &proc_signal_ops, spec_flags, 4471 func, data, (void *)(uintptr_t)signum, no_ve_dtor)); 4472 } 4473 4474 static int 4475 pt_add_fault(mdb_tgt_t *t, int fltnum, 4476 int spec_flags, mdb_tgt_se_f *func, void *data) 4477 { 4478 if (fltnum <= 0 || fltnum > PRMAXFAULT) { 4479 (void) set_errno(EMDB_BADFLTNUM); 4480 return (0); 4481 } 4482 4483 return (mdb_tgt_vespec_insert(t, &proc_fault_ops, spec_flags, 4484 func, data, (void *)(uintptr_t)fltnum, no_ve_dtor)); 4485 } 4486 4487 static int 4488 pt_getareg(mdb_tgt_t *t, mdb_tgt_tid_t tid, 4489 const char *rname, mdb_tgt_reg_t *rp) 4490 { 4491 pt_data_t *pt = t->t_data; 4492 prgregset_t grs; 4493 mdb_var_t *v; 4494 4495 if (t->t_pshandle == NULL) 4496 return (set_errno(EMDB_NOPROC)); 4497 4498 if ((v = mdb_nv_lookup(&pt->p_regs, rname)) != NULL) { 4499 uintmax_t rd_nval = mdb_nv_get_value(v); 4500 ushort_t rd_num = MDB_TGT_R_NUM(rd_nval); 4501 ushort_t rd_flags = MDB_TGT_R_FLAGS(rd_nval); 4502 4503 if (!MDB_TGT_R_IS_FP(rd_flags)) { 4504 mdb_tgt_reg_t r = 0; 4505 4506 #if defined(__sparc) && defined(_ILP32) 4507 /* 4508 * If we are debugging on 32-bit SPARC, the globals and 4509 * outs can have 32 upper bits hiding in the xregs. 4510 */ 4511 /* gcc doesn't like >= R_G0 because R_G0 == 0 */ 4512 int is_g = (rd_num == R_G0 || 4513 rd_num >= R_G1 && rd_num <= R_G7); 4514 int is_o = (rd_num >= R_O0 && rd_num <= R_O7); 4515 prxregset_t xrs; 4516 4517 if (is_g && PTL_GETXREGS(t, tid, &xrs) == 0 && 4518 xrs.pr_type == XR_TYPE_V8P) { 4519 r |= (uint64_t)xrs.pr_un.pr_v8p.pr_xg[ 4520 rd_num - R_G0 + XR_G0] << 32; 4521 } 4522 4523 if (is_o && PTL_GETXREGS(t, tid, &xrs) == 0 && 4524 xrs.pr_type == XR_TYPE_V8P) { 4525 r |= (uint64_t)xrs.pr_un.pr_v8p.pr_xo[ 4526 rd_num - R_O0 + XR_O0] << 32; 4527 } 4528 #endif /* __sparc && _ILP32 */ 4529 4530 /* 4531 * Avoid sign-extension by casting: recall that procfs 4532 * defines prgreg_t as a long or int and our native 4533 * register handling uses uint64_t's. 4534 */ 4535 if (PTL_GETREGS(t, tid, grs) == 0) { 4536 *rp = r | (ulong_t)grs[rd_num]; 4537 if (rd_flags & MDB_TGT_R_32) 4538 *rp &= 0xffffffffULL; 4539 else if (rd_flags & MDB_TGT_R_16) 4540 *rp &= 0xffffULL; 4541 else if (rd_flags & MDB_TGT_R_8H) 4542 *rp = (*rp & 0xff00ULL) >> 8; 4543 else if (rd_flags & MDB_TGT_R_8L) 4544 *rp &= 0xffULL; 4545 return (0); 4546 } 4547 return (-1); 4548 } else 4549 return (pt_getfpreg(t, tid, rd_num, rd_flags, rp)); 4550 } 4551 4552 return (set_errno(EMDB_BADREG)); 4553 } 4554 4555 static int 4556 pt_putareg(mdb_tgt_t *t, mdb_tgt_tid_t tid, const char *rname, mdb_tgt_reg_t r) 4557 { 4558 pt_data_t *pt = t->t_data; 4559 prgregset_t grs; 4560 mdb_var_t *v; 4561 4562 if (t->t_pshandle == NULL) 4563 return (set_errno(EMDB_NOPROC)); 4564 4565 if ((v = mdb_nv_lookup(&pt->p_regs, rname)) != NULL) { 4566 uintmax_t rd_nval = mdb_nv_get_value(v); 4567 ushort_t rd_num = MDB_TGT_R_NUM(rd_nval); 4568 ushort_t rd_flags = MDB_TGT_R_FLAGS(rd_nval); 4569 4570 if (!MDB_TGT_R_IS_FP(rd_flags)) { 4571 4572 if (rd_flags & MDB_TGT_R_32) 4573 r &= 0xffffffffULL; 4574 else if (rd_flags & MDB_TGT_R_16) 4575 r &= 0xffffULL; 4576 else if (rd_flags & MDB_TGT_R_8H) 4577 r = (r & 0xffULL) << 8; 4578 else if (rd_flags & MDB_TGT_R_8L) 4579 r &= 0xffULL; 4580 4581 #if defined(__sparc) && defined(_ILP32) 4582 /* 4583 * If we are debugging on 32-bit SPARC, the globals and 4584 * outs can have 32 upper bits stored in the xregs. 4585 */ 4586 int is_g = (rd_num == R_G0 || 4587 rd_num >= R_G1 && rd_num <= R_G7); 4588 int is_o = (rd_num >= R_O0 && rd_num <= R_O7); 4589 prxregset_t xrs; 4590 4591 if ((is_g || is_o) && PTL_GETXREGS(t, tid, &xrs) == 0 && 4592 xrs.pr_type == XR_TYPE_V8P) { 4593 if (is_g) { 4594 xrs.pr_un.pr_v8p.pr_xg[rd_num - 4595 R_G0 + XR_G0] = (uint32_t)(r >> 32); 4596 } else if (is_o) { 4597 xrs.pr_un.pr_v8p.pr_xo[rd_num - 4598 R_O0 + XR_O0] = (uint32_t)(r >> 32); 4599 } 4600 4601 if (PTL_SETXREGS(t, tid, &xrs) == -1) 4602 return (-1); 4603 } 4604 #endif /* __sparc && _ILP32 */ 4605 4606 if (PTL_GETREGS(t, tid, grs) == 0) { 4607 grs[rd_num] = (prgreg_t)r; 4608 return (PTL_SETREGS(t, tid, grs)); 4609 } 4610 return (-1); 4611 } else 4612 return (pt_putfpreg(t, tid, rd_num, rd_flags, r)); 4613 } 4614 4615 return (set_errno(EMDB_BADREG)); 4616 } 4617 4618 static int 4619 pt_stack_call(pt_stkarg_t *psp, const prgregset_t grs, uint_t argc, long *argv) 4620 { 4621 psp->pstk_gotpc |= (grs[R_PC] != 0); 4622 4623 if (!psp->pstk_gotpc) 4624 return (0); /* skip initial zeroed frames */ 4625 4626 return (psp->pstk_func(psp->pstk_private, grs[R_PC], 4627 argc, argv, (const struct mdb_tgt_gregset *)grs)); 4628 } 4629 4630 static int 4631 pt_stack_iter(mdb_tgt_t *t, const mdb_tgt_gregset_t *gsp, 4632 mdb_tgt_stack_f *func, void *arg) 4633 { 4634 if (t->t_pshandle != NULL) { 4635 pt_stkarg_t pstk; 4636 4637 pstk.pstk_func = func; 4638 pstk.pstk_private = arg; 4639 pstk.pstk_gotpc = FALSE; 4640 4641 (void) Pstack_iter(t->t_pshandle, gsp->gregs, 4642 (proc_stack_f *)pt_stack_call, &pstk); 4643 4644 return (0); 4645 } 4646 4647 return (set_errno(EMDB_NOPROC)); 4648 } 4649 4650 static int 4651 pt_auxv(mdb_tgt_t *t, const auxv_t **auxvp) 4652 { 4653 if (t->t_pshandle != NULL) { 4654 *auxvp = Pgetauxvec(t->t_pshandle); 4655 return (0); 4656 } 4657 4658 return (set_errno(EMDB_NOPROC)); 4659 } 4660 4661 4662 static const mdb_tgt_ops_t proc_ops = { 4663 pt_setflags, /* t_setflags */ 4664 (int (*)()) mdb_tgt_notsup, /* t_setcontext */ 4665 pt_activate, /* t_activate */ 4666 pt_deactivate, /* t_deactivate */ 4667 pt_periodic, /* t_periodic */ 4668 pt_destroy, /* t_destroy */ 4669 pt_name, /* t_name */ 4670 (const char *(*)()) mdb_conf_isa, /* t_isa */ 4671 pt_platform, /* t_platform */ 4672 pt_uname, /* t_uname */ 4673 pt_dmodel, /* t_dmodel */ 4674 (ssize_t (*)()) mdb_tgt_notsup, /* t_aread */ 4675 (ssize_t (*)()) mdb_tgt_notsup, /* t_awrite */ 4676 pt_vread, /* t_vread */ 4677 pt_vwrite, /* t_vwrite */ 4678 (ssize_t (*)()) mdb_tgt_notsup, /* t_pread */ 4679 (ssize_t (*)()) mdb_tgt_notsup, /* t_pwrite */ 4680 pt_fread, /* t_fread */ 4681 pt_fwrite, /* t_fwrite */ 4682 (ssize_t (*)()) mdb_tgt_notsup, /* t_ioread */ 4683 (ssize_t (*)()) mdb_tgt_notsup, /* t_iowrite */ 4684 (int (*)()) mdb_tgt_notsup, /* t_vtop */ 4685 pt_lookup_by_name, /* t_lookup_by_name */ 4686 pt_lookup_by_addr, /* t_lookup_by_addr */ 4687 pt_symbol_iter, /* t_symbol_iter */ 4688 pt_mapping_iter, /* t_mapping_iter */ 4689 pt_object_iter, /* t_object_iter */ 4690 pt_addr_to_map, /* t_addr_to_map */ 4691 pt_name_to_map, /* t_name_to_map */ 4692 pt_addr_to_ctf, /* t_addr_to_ctf */ 4693 pt_name_to_ctf, /* t_name_to_ctf */ 4694 pt_status, /* t_status */ 4695 pt_run, /* t_run */ 4696 pt_step, /* t_step */ 4697 pt_step_out, /* t_step_out */ 4698 (int (*)()) mdb_tgt_notsup, /* t_step_branch */ 4699 pt_next, /* t_next */ 4700 pt_continue, /* t_cont */ 4701 pt_signal, /* t_signal */ 4702 pt_add_vbrkpt, /* t_add_vbrkpt */ 4703 pt_add_sbrkpt, /* t_add_sbrkpt */ 4704 (int (*)()) mdb_tgt_null, /* t_add_pwapt */ 4705 pt_add_vwapt, /* t_add_vwapt */ 4706 (int (*)()) mdb_tgt_null, /* t_add_iowapt */ 4707 pt_add_sysenter, /* t_add_sysenter */ 4708 pt_add_sysexit, /* t_add_sysexit */ 4709 pt_add_signal, /* t_add_signal */ 4710 pt_add_fault, /* t_add_fault */ 4711 pt_getareg, /* t_getareg */ 4712 pt_putareg, /* t_putareg */ 4713 pt_stack_iter, /* t_stack_iter */ 4714 pt_auxv /* t_auxv */ 4715 }; 4716 4717 /* 4718 * Utility function for converting libproc errno values to mdb error values 4719 * for the ptl calls below. Currently, we only need to convert ENOENT to 4720 * EMDB_NOTHREAD to produce a more useful error message for the user. 4721 */ 4722 static int 4723 ptl_err(int error) 4724 { 4725 if (error != 0 && errno == ENOENT) 4726 return (set_errno(EMDB_NOTHREAD)); 4727 4728 return (error); 4729 } 4730 4731 /*ARGSUSED*/ 4732 static mdb_tgt_tid_t 4733 pt_lwp_tid(mdb_tgt_t *t, void *tap) 4734 { 4735 if (t->t_pshandle != NULL) 4736 return (Pstatus(t->t_pshandle)->pr_lwp.pr_lwpid); 4737 4738 return (set_errno(EMDB_NOPROC)); 4739 } 4740 4741 static int 4742 pt_lwp_add(mdb_addrvec_t *ap, const lwpstatus_t *psp) 4743 { 4744 mdb_addrvec_unshift(ap, psp->pr_lwpid); 4745 return (0); 4746 } 4747 4748 /*ARGSUSED*/ 4749 static int 4750 pt_lwp_iter(mdb_tgt_t *t, void *tap, mdb_addrvec_t *ap) 4751 { 4752 if (t->t_pshandle != NULL) 4753 return (Plwp_iter(t->t_pshandle, (proc_lwp_f *)pt_lwp_add, ap)); 4754 4755 return (set_errno(EMDB_NOPROC)); 4756 } 4757 4758 /*ARGSUSED*/ 4759 static int 4760 pt_lwp_getregs(mdb_tgt_t *t, void *tap, mdb_tgt_tid_t tid, prgregset_t gregs) 4761 { 4762 if (t->t_pshandle != NULL) { 4763 return (ptl_err(Plwp_getregs(t->t_pshandle, 4764 (lwpid_t)tid, gregs))); 4765 } 4766 return (set_errno(EMDB_NOPROC)); 4767 } 4768 4769 /*ARGSUSED*/ 4770 static int 4771 pt_lwp_setregs(mdb_tgt_t *t, void *tap, mdb_tgt_tid_t tid, prgregset_t gregs) 4772 { 4773 if (t->t_pshandle != NULL) { 4774 return (ptl_err(Plwp_setregs(t->t_pshandle, 4775 (lwpid_t)tid, gregs))); 4776 } 4777 return (set_errno(EMDB_NOPROC)); 4778 } 4779 4780 #ifdef __sparc 4781 4782 /*ARGSUSED*/ 4783 static int 4784 pt_lwp_getxregs(mdb_tgt_t *t, void *tap, mdb_tgt_tid_t tid, prxregset_t *xregs) 4785 { 4786 if (t->t_pshandle != NULL) { 4787 return (ptl_err(Plwp_getxregs(t->t_pshandle, 4788 (lwpid_t)tid, xregs))); 4789 } 4790 return (set_errno(EMDB_NOPROC)); 4791 } 4792 4793 /*ARGSUSED*/ 4794 static int 4795 pt_lwp_setxregs(mdb_tgt_t *t, void *tap, mdb_tgt_tid_t tid, 4796 const prxregset_t *xregs) 4797 { 4798 if (t->t_pshandle != NULL) { 4799 return (ptl_err(Plwp_setxregs(t->t_pshandle, 4800 (lwpid_t)tid, xregs))); 4801 } 4802 return (set_errno(EMDB_NOPROC)); 4803 } 4804 4805 #endif /* __sparc */ 4806 4807 /*ARGSUSED*/ 4808 static int 4809 pt_lwp_getfpregs(mdb_tgt_t *t, void *tap, mdb_tgt_tid_t tid, 4810 prfpregset_t *fpregs) 4811 { 4812 if (t->t_pshandle != NULL) { 4813 return (ptl_err(Plwp_getfpregs(t->t_pshandle, 4814 (lwpid_t)tid, fpregs))); 4815 } 4816 return (set_errno(EMDB_NOPROC)); 4817 } 4818 4819 /*ARGSUSED*/ 4820 static int 4821 pt_lwp_setfpregs(mdb_tgt_t *t, void *tap, mdb_tgt_tid_t tid, 4822 const prfpregset_t *fpregs) 4823 { 4824 if (t->t_pshandle != NULL) { 4825 return (ptl_err(Plwp_setfpregs(t->t_pshandle, 4826 (lwpid_t)tid, fpregs))); 4827 } 4828 return (set_errno(EMDB_NOPROC)); 4829 } 4830 4831 static const pt_ptl_ops_t proc_lwp_ops = { 4832 (int (*)()) mdb_tgt_nop, 4833 (void (*)()) mdb_tgt_nop, 4834 pt_lwp_tid, 4835 pt_lwp_iter, 4836 pt_lwp_getregs, 4837 pt_lwp_setregs, 4838 #ifdef __sparc 4839 pt_lwp_getxregs, 4840 pt_lwp_setxregs, 4841 #endif 4842 pt_lwp_getfpregs, 4843 pt_lwp_setfpregs 4844 }; 4845 4846 static int 4847 pt_tdb_ctor(mdb_tgt_t *t) 4848 { 4849 pt_data_t *pt = t->t_data; 4850 td_thragent_t *tap; 4851 td_err_e err; 4852 4853 if ((err = pt->p_tdb_ops->td_ta_new(t->t_pshandle, &tap)) != TD_OK) 4854 return (set_errno(tdb_to_errno(err))); 4855 4856 pt->p_ptl_hdl = tap; 4857 return (0); 4858 } 4859 4860 static void 4861 pt_tdb_dtor(mdb_tgt_t *t, void *tap) 4862 { 4863 pt_data_t *pt = t->t_data; 4864 4865 ASSERT(tap == pt->p_ptl_hdl); 4866 (void) pt->p_tdb_ops->td_ta_delete(tap); 4867 pt->p_ptl_hdl = NULL; 4868 } 4869 4870 static mdb_tgt_tid_t 4871 pt_tdb_tid(mdb_tgt_t *t, void *tap) 4872 { 4873 pt_data_t *pt = t->t_data; 4874 4875 td_thrhandle_t th; 4876 td_thrinfo_t ti; 4877 td_err_e err; 4878 4879 if (t->t_pshandle == NULL) 4880 return (set_errno(EMDB_NOPROC)); 4881 4882 if ((err = pt->p_tdb_ops->td_ta_map_lwp2thr(tap, 4883 Pstatus(t->t_pshandle)->pr_lwp.pr_lwpid, &th)) != TD_OK) 4884 return (set_errno(tdb_to_errno(err))); 4885 4886 if ((err = pt->p_tdb_ops->td_thr_get_info(&th, &ti)) != TD_OK) 4887 return (set_errno(tdb_to_errno(err))); 4888 4889 return (ti.ti_tid); 4890 } 4891 4892 static int 4893 pt_tdb_add(const td_thrhandle_t *thp, pt_addarg_t *pap) 4894 { 4895 td_thrinfo_t ti; 4896 4897 if (pap->pa_pt->p_tdb_ops->td_thr_get_info(thp, &ti) == TD_OK && 4898 ti.ti_state != TD_THR_ZOMBIE) 4899 mdb_addrvec_unshift(pap->pa_ap, ti.ti_tid); 4900 4901 return (0); 4902 } 4903 4904 static int 4905 pt_tdb_iter(mdb_tgt_t *t, void *tap, mdb_addrvec_t *ap) 4906 { 4907 pt_data_t *pt = t->t_data; 4908 pt_addarg_t arg; 4909 int err; 4910 4911 if (t->t_pshandle == NULL) 4912 return (set_errno(EMDB_NOPROC)); 4913 4914 arg.pa_pt = pt; 4915 arg.pa_ap = ap; 4916 4917 if ((err = pt->p_tdb_ops->td_ta_thr_iter(tap, (td_thr_iter_f *) 4918 pt_tdb_add, &arg, TD_THR_ANY_STATE, TD_THR_LOWEST_PRIORITY, 4919 TD_SIGNO_MASK, TD_THR_ANY_USER_FLAGS)) != TD_OK) 4920 return (set_errno(tdb_to_errno(err))); 4921 4922 return (0); 4923 } 4924 4925 static int 4926 pt_tdb_getregs(mdb_tgt_t *t, void *tap, mdb_tgt_tid_t tid, prgregset_t gregs) 4927 { 4928 pt_data_t *pt = t->t_data; 4929 4930 td_thrhandle_t th; 4931 td_err_e err; 4932 4933 if (t->t_pshandle == NULL) 4934 return (set_errno(EMDB_NOPROC)); 4935 4936 if ((err = pt->p_tdb_ops->td_ta_map_id2thr(tap, tid, &th)) != TD_OK) 4937 return (set_errno(tdb_to_errno(err))); 4938 4939 err = pt->p_tdb_ops->td_thr_getgregs(&th, gregs); 4940 if (err != TD_OK && err != TD_PARTIALREG) 4941 return (set_errno(tdb_to_errno(err))); 4942 4943 return (0); 4944 } 4945 4946 static int 4947 pt_tdb_setregs(mdb_tgt_t *t, void *tap, mdb_tgt_tid_t tid, prgregset_t gregs) 4948 { 4949 pt_data_t *pt = t->t_data; 4950 4951 td_thrhandle_t th; 4952 td_err_e err; 4953 4954 if (t->t_pshandle == NULL) 4955 return (set_errno(EMDB_NOPROC)); 4956 4957 if ((err = pt->p_tdb_ops->td_ta_map_id2thr(tap, tid, &th)) != TD_OK) 4958 return (set_errno(tdb_to_errno(err))); 4959 4960 err = pt->p_tdb_ops->td_thr_setgregs(&th, gregs); 4961 if (err != TD_OK && err != TD_PARTIALREG) 4962 return (set_errno(tdb_to_errno(err))); 4963 4964 return (0); 4965 } 4966 4967 #ifdef __sparc 4968 4969 static int 4970 pt_tdb_getxregs(mdb_tgt_t *t, void *tap, mdb_tgt_tid_t tid, prxregset_t *xregs) 4971 { 4972 pt_data_t *pt = t->t_data; 4973 4974 td_thrhandle_t th; 4975 td_err_e err; 4976 4977 if (t->t_pshandle == NULL) 4978 return (set_errno(EMDB_NOPROC)); 4979 4980 if ((err = pt->p_tdb_ops->td_ta_map_id2thr(tap, tid, &th)) != TD_OK) 4981 return (set_errno(tdb_to_errno(err))); 4982 4983 err = pt->p_tdb_ops->td_thr_getxregs(&th, xregs); 4984 if (err != TD_OK && err != TD_PARTIALREG) 4985 return (set_errno(tdb_to_errno(err))); 4986 4987 return (0); 4988 } 4989 4990 static int 4991 pt_tdb_setxregs(mdb_tgt_t *t, void *tap, mdb_tgt_tid_t tid, 4992 const prxregset_t *xregs) 4993 { 4994 pt_data_t *pt = t->t_data; 4995 4996 td_thrhandle_t th; 4997 td_err_e err; 4998 4999 if (t->t_pshandle == NULL) 5000 return (set_errno(EMDB_NOPROC)); 5001 5002 if ((err = pt->p_tdb_ops->td_ta_map_id2thr(tap, tid, &th)) != TD_OK) 5003 return (set_errno(tdb_to_errno(err))); 5004 5005 err = pt->p_tdb_ops->td_thr_setxregs(&th, xregs); 5006 if (err != TD_OK && err != TD_PARTIALREG) 5007 return (set_errno(tdb_to_errno(err))); 5008 5009 return (0); 5010 } 5011 5012 #endif /* __sparc */ 5013 5014 static int 5015 pt_tdb_getfpregs(mdb_tgt_t *t, void *tap, mdb_tgt_tid_t tid, 5016 prfpregset_t *fpregs) 5017 { 5018 pt_data_t *pt = t->t_data; 5019 5020 td_thrhandle_t th; 5021 td_err_e err; 5022 5023 if (t->t_pshandle == NULL) 5024 return (set_errno(EMDB_NOPROC)); 5025 5026 if ((err = pt->p_tdb_ops->td_ta_map_id2thr(tap, tid, &th)) != TD_OK) 5027 return (set_errno(tdb_to_errno(err))); 5028 5029 err = pt->p_tdb_ops->td_thr_getfpregs(&th, fpregs); 5030 if (err != TD_OK && err != TD_PARTIALREG) 5031 return (set_errno(tdb_to_errno(err))); 5032 5033 return (0); 5034 } 5035 5036 static int 5037 pt_tdb_setfpregs(mdb_tgt_t *t, void *tap, mdb_tgt_tid_t tid, 5038 const prfpregset_t *fpregs) 5039 { 5040 pt_data_t *pt = t->t_data; 5041 5042 td_thrhandle_t th; 5043 td_err_e err; 5044 5045 if (t->t_pshandle == NULL) 5046 return (set_errno(EMDB_NOPROC)); 5047 5048 if ((err = pt->p_tdb_ops->td_ta_map_id2thr(tap, tid, &th)) != TD_OK) 5049 return (set_errno(tdb_to_errno(err))); 5050 5051 err = pt->p_tdb_ops->td_thr_setfpregs(&th, fpregs); 5052 if (err != TD_OK && err != TD_PARTIALREG) 5053 return (set_errno(tdb_to_errno(err))); 5054 5055 return (0); 5056 } 5057 5058 static const pt_ptl_ops_t proc_tdb_ops = { 5059 pt_tdb_ctor, 5060 pt_tdb_dtor, 5061 pt_tdb_tid, 5062 pt_tdb_iter, 5063 pt_tdb_getregs, 5064 pt_tdb_setregs, 5065 #ifdef __sparc 5066 pt_tdb_getxregs, 5067 pt_tdb_setxregs, 5068 #endif 5069 pt_tdb_getfpregs, 5070 pt_tdb_setfpregs 5071 }; 5072 5073 static ssize_t 5074 pt_xd_auxv(mdb_tgt_t *t, void *buf, size_t nbytes) 5075 { 5076 struct ps_prochandle *P = t->t_pshandle; 5077 const auxv_t *auxp, *auxv = NULL; 5078 int auxn = 0; 5079 5080 if (P != NULL && (auxv = Pgetauxvec(P)) != NULL && 5081 auxv->a_type != AT_NULL) { 5082 for (auxp = auxv, auxn = 1; auxp->a_type != NULL; auxp++) 5083 auxn++; 5084 } 5085 5086 if (buf == NULL && nbytes == 0) 5087 return (sizeof (auxv_t) * auxn); 5088 5089 if (auxn == 0) 5090 return (set_errno(ENODATA)); 5091 5092 nbytes = MIN(nbytes, sizeof (auxv_t) * auxn); 5093 bcopy(auxv, buf, nbytes); 5094 return (nbytes); 5095 } 5096 5097 static ssize_t 5098 pt_xd_cred(mdb_tgt_t *t, void *buf, size_t nbytes) 5099 { 5100 prcred_t cr, *crp; 5101 size_t cbytes = 0; 5102 5103 if (t->t_pshandle != NULL && Pcred(t->t_pshandle, &cr, 1) == 0) { 5104 cbytes = (cr.pr_ngroups <= 1) ? sizeof (prcred_t) : 5105 (sizeof (prcred_t) + (cr.pr_ngroups - 1) * sizeof (gid_t)); 5106 } 5107 5108 if (buf == NULL && nbytes == 0) 5109 return (cbytes); 5110 5111 if (cbytes == 0) 5112 return (set_errno(ENODATA)); 5113 5114 crp = mdb_alloc(cbytes, UM_SLEEP); 5115 5116 if (Pcred(t->t_pshandle, crp, cr.pr_ngroups) == -1) 5117 return (set_errno(ENODATA)); 5118 5119 nbytes = MIN(nbytes, cbytes); 5120 bcopy(crp, buf, nbytes); 5121 mdb_free(crp, cbytes); 5122 return (nbytes); 5123 } 5124 5125 static ssize_t 5126 pt_xd_ehdr(mdb_tgt_t *t, void *buf, size_t nbytes) 5127 { 5128 pt_data_t *pt = t->t_data; 5129 5130 if (buf == NULL && nbytes == 0) 5131 return (sizeof (GElf_Ehdr)); 5132 5133 if (pt->p_file == NULL) 5134 return (set_errno(ENODATA)); 5135 5136 nbytes = MIN(nbytes, sizeof (GElf_Ehdr)); 5137 bcopy(&pt->p_file->gf_ehdr, buf, nbytes); 5138 return (nbytes); 5139 } 5140 5141 static int 5142 pt_copy_lwp(lwpstatus_t **lspp, const lwpstatus_t *lsp) 5143 { 5144 bcopy(lsp, *lspp, sizeof (lwpstatus_t)); 5145 (*lspp)++; 5146 return (0); 5147 } 5148 5149 static ssize_t 5150 pt_xd_lwpstatus(mdb_tgt_t *t, void *buf, size_t nbytes) 5151 { 5152 lwpstatus_t *lsp, *lbuf; 5153 const pstatus_t *psp; 5154 int nlwp = 0; 5155 5156 if (t->t_pshandle != NULL && (psp = Pstatus(t->t_pshandle)) != NULL) 5157 nlwp = psp->pr_nlwp; 5158 5159 if (buf == NULL && nbytes == 0) 5160 return (sizeof (lwpstatus_t) * nlwp); 5161 5162 if (nlwp == 0) 5163 return (set_errno(ENODATA)); 5164 5165 lsp = lbuf = mdb_alloc(sizeof (lwpstatus_t) * nlwp, UM_SLEEP); 5166 nbytes = MIN(nbytes, sizeof (lwpstatus_t) * nlwp); 5167 5168 (void) Plwp_iter(t->t_pshandle, (proc_lwp_f *)pt_copy_lwp, &lsp); 5169 bcopy(lbuf, buf, nbytes); 5170 5171 mdb_free(lbuf, sizeof (lwpstatus_t) * nlwp); 5172 return (nbytes); 5173 } 5174 5175 static ssize_t 5176 pt_xd_pshandle(mdb_tgt_t *t, void *buf, size_t nbytes) 5177 { 5178 if (buf == NULL && nbytes == 0) 5179 return (sizeof (struct ps_prochandle *)); 5180 5181 if (t->t_pshandle == NULL || nbytes != sizeof (struct ps_prochandle *)) 5182 return (set_errno(ENODATA)); 5183 5184 bcopy(&t->t_pshandle, buf, nbytes); 5185 return (nbytes); 5186 } 5187 5188 static ssize_t 5189 pt_xd_psinfo(mdb_tgt_t *t, void *buf, size_t nbytes) 5190 { 5191 const psinfo_t *psp; 5192 5193 if (buf == NULL && nbytes == 0) 5194 return (sizeof (psinfo_t)); 5195 5196 if (t->t_pshandle == NULL || (psp = Ppsinfo(t->t_pshandle)) == NULL) 5197 return (set_errno(ENODATA)); 5198 5199 nbytes = MIN(nbytes, sizeof (psinfo_t)); 5200 bcopy(psp, buf, nbytes); 5201 return (nbytes); 5202 } 5203 5204 static ssize_t 5205 pt_xd_pstatus(mdb_tgt_t *t, void *buf, size_t nbytes) 5206 { 5207 const pstatus_t *psp; 5208 5209 if (buf == NULL && nbytes == 0) 5210 return (sizeof (pstatus_t)); 5211 5212 if (t->t_pshandle == NULL || (psp = Pstatus(t->t_pshandle)) == NULL) 5213 return (set_errno(ENODATA)); 5214 5215 nbytes = MIN(nbytes, sizeof (pstatus_t)); 5216 bcopy(psp, buf, nbytes); 5217 return (nbytes); 5218 } 5219 5220 static ssize_t 5221 pt_xd_utsname(mdb_tgt_t *t, void *buf, size_t nbytes) 5222 { 5223 struct utsname uts; 5224 5225 if (buf == NULL && nbytes == 0) 5226 return (sizeof (struct utsname)); 5227 5228 if (t->t_pshandle == NULL || Puname(t->t_pshandle, &uts) != 0) 5229 return (set_errno(ENODATA)); 5230 5231 nbytes = MIN(nbytes, sizeof (struct utsname)); 5232 bcopy(&uts, buf, nbytes); 5233 return (nbytes); 5234 } 5235 5236 int 5237 mdb_proc_tgt_create(mdb_tgt_t *t, int argc, const char *argv[]) 5238 { 5239 pt_data_t *pt = mdb_zalloc(sizeof (pt_data_t), UM_SLEEP); 5240 5241 const char *aout_path = argc > 0 ? argv[0] : PT_EXEC_PATH; 5242 const char *core_path = argc > 1 ? argv[1] : NULL; 5243 5244 const mdb_tgt_regdesc_t *rdp; 5245 char execname[MAXPATHLEN]; 5246 struct stat64 st; 5247 int perr; 5248 int state; 5249 struct rlimit rlim; 5250 int i; 5251 5252 if (argc > 2) { 5253 mdb_free(pt, sizeof (pt_data_t)); 5254 return (set_errno(EINVAL)); 5255 } 5256 5257 if (t->t_flags & MDB_TGT_F_RDWR) 5258 pt->p_oflags = O_RDWR; 5259 else 5260 pt->p_oflags = O_RDONLY; 5261 5262 if (t->t_flags & MDB_TGT_F_FORCE) 5263 pt->p_gflags |= PGRAB_FORCE; 5264 if (t->t_flags & MDB_TGT_F_NOSTOP) 5265 pt->p_gflags |= PGRAB_NOSTOP; 5266 5267 pt->p_ptl_ops = &proc_lwp_ops; 5268 pt->p_maxsig = sysconf(_SC_SIGRT_MAX); 5269 5270 (void) mdb_nv_create(&pt->p_regs, UM_SLEEP); 5271 (void) mdb_nv_create(&pt->p_env, UM_SLEEP); 5272 5273 t->t_ops = &proc_ops; 5274 t->t_data = pt; 5275 5276 /* 5277 * If no core file name was specified, but the file ./core is present, 5278 * infer that we want to debug it. I find this behavior confusing, 5279 * so we only do this when precise adb(1) compatibility is required. 5280 */ 5281 if (core_path == NULL && (mdb.m_flags & MDB_FL_ADB) && 5282 access(PT_CORE_PATH, F_OK) == 0) 5283 core_path = PT_CORE_PATH; 5284 5285 /* 5286 * For compatibility with adb(1), the special name "-" may be used 5287 * to suppress the loading of the executable or core file. 5288 */ 5289 if (aout_path != NULL && strcmp(aout_path, "-") == 0) 5290 aout_path = NULL; 5291 if (core_path != NULL && strcmp(core_path, "-") == 0) 5292 core_path = NULL; 5293 5294 /* 5295 * If a core file or pid was specified, attempt to grab it now using 5296 * proc_arg_grab(); otherwise we'll create a fresh process later. 5297 */ 5298 if (core_path != NULL && (t->t_pshandle = proc_arg_xgrab(core_path, 5299 aout_path == PT_EXEC_PATH ? NULL : aout_path, PR_ARG_ANY, 5300 pt->p_gflags, &perr, NULL)) == NULL) { 5301 mdb_warn("cannot debug %s: %s\n", core_path, Pgrab_error(perr)); 5302 goto err; 5303 } 5304 5305 if (aout_path != NULL && 5306 (pt->p_idlehandle = Pgrab_file(aout_path, &perr)) != NULL && 5307 t->t_pshandle == NULL) 5308 t->t_pshandle = pt->p_idlehandle; 5309 5310 if (t->t_pshandle != NULL) 5311 state = Pstate(t->t_pshandle); 5312 5313 /* 5314 * Make sure we'll have enough file descriptors to handle a target 5315 * has many many mappings. 5316 */ 5317 if (getrlimit(RLIMIT_NOFILE, &rlim) == 0) { 5318 rlim.rlim_cur = rlim.rlim_max; 5319 (void) setrlimit(RLIMIT_NOFILE, &rlim); 5320 (void) enable_extended_FILE_stdio(-1, -1); 5321 } 5322 5323 /* 5324 * If we don't have an executable path or the executable path is the 5325 * /proc/<pid>/object/a.out path, but we now have a libproc handle, 5326 * attempt to derive the executable path using Pexecname(). We need 5327 * to do this in the /proc case in order to open the executable for 5328 * writing because /proc/object/<file> permission are masked with 0555. 5329 * If Pexecname() fails us, fall back to /proc/<pid>/object/a.out. 5330 */ 5331 if (t->t_pshandle != NULL && (aout_path == NULL || (stat64(aout_path, 5332 &st) == 0 && strcmp(st.st_fstype, "proc") == 0))) { 5333 GElf_Sym s; 5334 aout_path = Pexecname(t->t_pshandle, execname, MAXPATHLEN); 5335 if (aout_path == NULL && state != PS_DEAD && state != PS_IDLE) { 5336 (void) mdb_iob_snprintf(execname, sizeof (execname), 5337 "/proc/%d/object/a.out", 5338 (int)Pstatus(t->t_pshandle)->pr_pid); 5339 aout_path = execname; 5340 } 5341 if (aout_path == NULL && 5342 Plookup_by_name(t->t_pshandle, "a.out", "_start", &s) != 0) 5343 mdb_warn("warning: failed to infer pathname to " 5344 "executable; symbol table will not be available\n"); 5345 5346 mdb_dprintf(MDB_DBG_TGT, "a.out is %s\n", aout_path); 5347 } 5348 5349 /* 5350 * Attempt to open the executable file. We only want this operation 5351 * to actually cause the constructor to abort if the executable file 5352 * name was given explicitly. If we defaulted to PT_EXEC_PATH or 5353 * derived the executable using Pexecname, then we want to continue 5354 * along with p_fio and p_file set to NULL. 5355 */ 5356 if (aout_path != NULL && (pt->p_aout_fio = mdb_fdio_create_path(NULL, 5357 aout_path, pt->p_oflags, 0)) == NULL && argc > 0) { 5358 mdb_warn("failed to open %s", aout_path); 5359 goto err; 5360 } 5361 5362 /* 5363 * Now create an ELF file from the input file, if we have one. Again, 5364 * only abort the constructor if the name was given explicitly. 5365 */ 5366 if (pt->p_aout_fio != NULL && pt_open_aout(t, 5367 mdb_io_hold(pt->p_aout_fio)) == NULL && argc > 0) 5368 goto err; 5369 5370 /* 5371 * If we've successfully opened an ELF file, select the appropriate 5372 * disassembler based on the ELF header. 5373 */ 5374 if (pt->p_file != NULL) 5375 (void) mdb_dis_select(pt_disasm(&pt->p_file->gf_ehdr)); 5376 else 5377 (void) mdb_dis_select(pt_disasm(NULL)); 5378 5379 /* 5380 * Add each register described in the target ISA register description 5381 * list to our hash table of register descriptions and then add any 5382 * appropriate ISA-specific floating-point register descriptions. 5383 */ 5384 for (rdp = pt_regdesc; rdp->rd_name != NULL; rdp++) { 5385 (void) mdb_nv_insert(&pt->p_regs, rdp->rd_name, NULL, 5386 MDB_TGT_R_NVAL(rdp->rd_num, rdp->rd_flags), MDB_NV_RDONLY); 5387 } 5388 pt_addfpregs(t); 5389 5390 /* 5391 * Certain important /proc structures may be of interest to mdb 5392 * modules and their dcmds. Export these using the xdata interface: 5393 */ 5394 (void) mdb_tgt_xdata_insert(t, "auxv", 5395 "procfs auxv_t array", pt_xd_auxv); 5396 (void) mdb_tgt_xdata_insert(t, "cred", 5397 "procfs prcred_t structure", pt_xd_cred); 5398 (void) mdb_tgt_xdata_insert(t, "ehdr", 5399 "executable file GElf_Ehdr structure", pt_xd_ehdr); 5400 (void) mdb_tgt_xdata_insert(t, "lwpstatus", 5401 "procfs lwpstatus_t array", pt_xd_lwpstatus); 5402 (void) mdb_tgt_xdata_insert(t, "pshandle", 5403 "libproc proc service API handle", pt_xd_pshandle); 5404 (void) mdb_tgt_xdata_insert(t, "psinfo", 5405 "procfs psinfo_t structure", pt_xd_psinfo); 5406 (void) mdb_tgt_xdata_insert(t, "pstatus", 5407 "procfs pstatus_t structure", pt_xd_pstatus); 5408 (void) mdb_tgt_xdata_insert(t, "utsname", 5409 "utsname structure", pt_xd_utsname); 5410 5411 /* 5412 * Force a status update now so that we fill in t_status with the 5413 * latest information based on any successful grab. 5414 */ 5415 (void) mdb_tgt_status(t, &t->t_status); 5416 5417 /* 5418 * If we're not examining a core file, trace SIGINT and all signals 5419 * that cause the process to dump core as part of our initialization. 5420 */ 5421 if ((t->t_pshandle != NULL && state != PS_DEAD && state != PS_IDLE) || 5422 (pt->p_file != NULL && pt->p_file->gf_ehdr.e_type == ET_EXEC)) { 5423 5424 int tflag = MDB_TGT_SPEC_STICKY; /* default sigs are sticky */ 5425 5426 (void) mdb_tgt_add_signal(t, SIGINT, tflag, no_se_f, NULL); 5427 (void) mdb_tgt_add_signal(t, SIGQUIT, tflag, no_se_f, NULL); 5428 (void) mdb_tgt_add_signal(t, SIGILL, tflag, no_se_f, NULL); 5429 (void) mdb_tgt_add_signal(t, SIGTRAP, tflag, no_se_f, NULL); 5430 (void) mdb_tgt_add_signal(t, SIGABRT, tflag, no_se_f, NULL); 5431 (void) mdb_tgt_add_signal(t, SIGEMT, tflag, no_se_f, NULL); 5432 (void) mdb_tgt_add_signal(t, SIGFPE, tflag, no_se_f, NULL); 5433 (void) mdb_tgt_add_signal(t, SIGBUS, tflag, no_se_f, NULL); 5434 (void) mdb_tgt_add_signal(t, SIGSEGV, tflag, no_se_f, NULL); 5435 (void) mdb_tgt_add_signal(t, SIGSYS, tflag, no_se_f, NULL); 5436 (void) mdb_tgt_add_signal(t, SIGXCPU, tflag, no_se_f, NULL); 5437 (void) mdb_tgt_add_signal(t, SIGXFSZ, tflag, no_se_f, NULL); 5438 } 5439 5440 /* 5441 * If we've grabbed a live process, establish our initial breakpoints 5442 * and librtld_db agent so we can track rtld activity. If FL_VCREATE 5443 * is set, this process was created by a previous instantiation of 5444 * the debugger, so reset pr_flags to kill it; otherwise we attached 5445 * to an already running process. Pgrab() has already set the PR_RLC 5446 * flag appropriately based on whether the process was stopped when we 5447 * attached. 5448 */ 5449 if (t->t_pshandle != NULL && state != PS_DEAD && state != PS_IDLE) { 5450 if (mdb.m_flags & MDB_FL_VCREATE) { 5451 (void) Punsetflags(t->t_pshandle, PR_RLC); 5452 (void) Psetflags(t->t_pshandle, PR_KLC); 5453 pt->p_rflags = PRELEASE_KILL; 5454 } else { 5455 (void) Punsetflags(t->t_pshandle, PR_KLC); 5456 } 5457 pt_post_attach(t); 5458 } 5459 5460 /* 5461 * Initialize a local copy of the environment, which can be modified 5462 * before running the program. 5463 */ 5464 for (i = 0; mdb.m_env[i] != NULL; i++) 5465 pt_env_set(pt, mdb.m_env[i]); 5466 5467 /* 5468 * If adb(1) compatibility mode is on, then print the appropriate 5469 * greeting message if we have grabbed a core file. 5470 */ 5471 if ((mdb.m_flags & MDB_FL_ADB) && t->t_pshandle != NULL && 5472 state == PS_DEAD) { 5473 const pstatus_t *psp = Pstatus(t->t_pshandle); 5474 int cursig = psp->pr_lwp.pr_cursig; 5475 char signame[SIG2STR_MAX]; 5476 5477 mdb_printf("core file = %s -- program ``%s'' on platform %s\n", 5478 core_path, aout_path ? aout_path : "?", pt_platform(t)); 5479 5480 if (cursig != 0 && sig2str(cursig, signame) == 0) 5481 mdb_printf("SIG%s: %s\n", signame, strsignal(cursig)); 5482 } 5483 5484 return (0); 5485 5486 err: 5487 pt_destroy(t); 5488 return (-1); 5489 } 5490