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 2018 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 void
1307 pt_thread_name(mdb_tgt_t *t, mdb_tgt_tid_t tid, char *buf, size_t bufsize)
1308 {
1309 char name[THREAD_NAME_MAX];
1310
1311 buf[0] = '\0';
1312
1313 if (t->t_pshandle == NULL ||
1314 Plwp_getname(t->t_pshandle, tid, name, sizeof (name)) != 0 ||
1315 name[0] == '\0') {
1316 (void) mdb_snprintf(buf, bufsize, "%lu", tid);
1317 return;
1318 }
1319
1320 (void) mdb_snprintf(buf, bufsize, "%lu [%s]", tid, name);
1321 }
1322
1323 static int
1324 pt_findstack(uintptr_t tid, uint_t flags, int argc, const mdb_arg_t *argv)
1325 {
1326 mdb_tgt_t *t = mdb.m_target;
1327 mdb_tgt_gregset_t gregs;
1328 int showargs = 0;
1329 int count;
1330 uintptr_t pc, sp;
1331 char name[128];
1332
1333 if (!(flags & DCMD_ADDRSPEC))
1334 return (DCMD_USAGE);
1335
1336 count = mdb_getopts(argc, argv, 'v', MDB_OPT_SETBITS, TRUE, &showargs,
1337 NULL);
1338 argc -= count;
1339 argv += count;
1340
1341 if (argc > 1 || (argc == 1 && argv->a_type != MDB_TYPE_STRING))
1342 return (DCMD_USAGE);
1343
1344 if (PTL_GETREGS(t, tid, gregs.gregs) != 0) {
1345 mdb_warn("failed to get register set for thread %p", tid);
1346 return (DCMD_ERR);
1347 }
1348
1349 pc = gregs.gregs[R_PC];
1350 #if defined(__i386) || defined(__amd64)
1351 sp = gregs.gregs[R_FP];
1352 #else
1353 sp = gregs.gregs[R_SP];
1354 #endif
1355
1356 pt_thread_name(t, tid, name, sizeof (name));
1357
1358 mdb_printf("stack pointer for thread %s: %p\n", name, sp);
1359 if (pc != 0)
1360 mdb_printf("[ %0?lr %a() ]\n", sp, pc);
1361
1362 (void) mdb_inc_indent(2);
1363 mdb_set_dot(sp);
1364
1365 if (argc == 1)
1366 (void) mdb_eval(argv->a_un.a_str);
1367 else if (showargs)
1368 (void) mdb_eval("<.$C");
1369 else
1370 (void) mdb_eval("<.$C0");
1371
1372 (void) mdb_dec_indent(2);
1373 return (DCMD_OK);
1374 }
1375
1376 /*ARGSUSED*/
1377 static int
1378 pt_gcore(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
1379 {
1380 mdb_tgt_t *t = mdb.m_target;
1381 char *prefix = "core";
1382 char *content_str = NULL;
1383 core_content_t content = CC_CONTENT_DEFAULT;
1384 size_t size;
1385 char *fname;
1386 pid_t pid;
1387
1388 if (flags & DCMD_ADDRSPEC)
1389 return (DCMD_USAGE);
1390
1391 if (mdb_getopts(argc, argv,
1392 'o', MDB_OPT_STR, &prefix,
1393 'c', MDB_OPT_STR, &content_str, NULL) != argc)
1394 return (DCMD_USAGE);
1395
1396 if (content_str != NULL &&
1397 (proc_str2content(content_str, &content) != 0 ||
1398 content == CC_CONTENT_INVALID)) {
1399 mdb_warn("invalid content string '%s'\n", content_str);
1400 return (DCMD_ERR);
1401 }
1402
1403 if (t->t_pshandle == NULL) {
1404 mdb_warn("no process active\n");
1405 return (DCMD_ERR);
1406 }
1407
1408 pid = Pstatus(t->t_pshandle)->pr_pid;
1409 size = 1 + mdb_snprintf(NULL, 0, "%s.%d", prefix, (int)pid);
1410 fname = mdb_alloc(size, UM_SLEEP | UM_GC);
1411 (void) mdb_snprintf(fname, size, "%s.%d", prefix, (int)pid);
1412
1413 if (Pgcore(t->t_pshandle, fname, content) != 0) {
1414 /*
1415 * Short writes during dumping are specifically described by
1416 * EBADE, just as ZFS uses this otherwise-unused code for
1417 * checksum errors. Translate to and mdb errno.
1418 */
1419 if (errno == EBADE)
1420 (void) set_errno(EMDB_SHORTWRITE);
1421 mdb_warn("couldn't dump core");
1422 return (DCMD_ERR);
1423 }
1424
1425 mdb_warn("%s dumped\n", fname);
1426
1427 return (DCMD_OK);
1428 }
1429
1430 /*ARGSUSED*/
1431 static int
1432 pt_kill(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
1433 {
1434 mdb_tgt_t *t = mdb.m_target;
1435 pt_data_t *pt = t->t_data;
1436 int state;
1437
1438 if ((flags & DCMD_ADDRSPEC) || argc != 0)
1439 return (DCMD_USAGE);
1440
1441 if (t->t_pshandle != NULL &&
1442 (state = Pstate(t->t_pshandle)) != PS_DEAD && state != PS_IDLE) {
1443 mdb_warn("victim process PID %d forcibly terminated\n",
1444 (int)Pstatus(t->t_pshandle)->pr_pid);
1445 pt_pre_detach(t, TRUE);
1446 pt_release_parents(t);
1447 Prelease(t->t_pshandle, PRELEASE_KILL);
1448 t->t_pshandle = pt->p_idlehandle;
1449 (void) mdb_tgt_status(t, &t->t_status);
1450 mdb.m_flags &= ~(MDB_FL_VCREATE | MDB_FL_JOBCTL);
1451 } else
1452 mdb_warn("no victim process is currently under control\n");
1453
1454 return (DCMD_OK);
1455 }
1456
1457 /*ARGSUSED*/
1458 static int
1459 pt_detach(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
1460 {
1461 mdb_tgt_t *t = mdb.m_target;
1462 pt_data_t *pt = t->t_data;
1463 int rflags = pt->p_rflags;
1464
1465 if (argc != 0 && argv->a_type == MDB_TYPE_STRING &&
1466 strcmp(argv->a_un.a_str, "-a") == 0) {
1467 rflags = PRELEASE_HANG | PRELEASE_CLEAR;
1468 argv++;
1469 argc--;
1470 }
1471
1472 if ((flags & DCMD_ADDRSPEC) || argc != 0)
1473 return (DCMD_USAGE);
1474
1475 if (t->t_pshandle == NULL || Pstate(t->t_pshandle) == PS_IDLE) {
1476 mdb_warn("debugger is not currently attached to a process "
1477 "or core file\n");
1478 return (DCMD_ERR);
1479 }
1480
1481 pt_pre_detach(t, TRUE);
1482 pt_release_parents(t);
1483 Prelease(t->t_pshandle, rflags);
1484 t->t_pshandle = pt->p_idlehandle;
1485 (void) mdb_tgt_status(t, &t->t_status);
1486 mdb.m_flags &= ~(MDB_FL_VCREATE | MDB_FL_JOBCTL);
1487
1488 return (DCMD_OK);
1489 }
1490
1491 static uintmax_t
1492 reg_disc_get(const mdb_var_t *v)
1493 {
1494 mdb_tgt_t *t = MDB_NV_COOKIE(v);
1495 mdb_tgt_tid_t tid = PTL_TID(t);
1496 mdb_tgt_reg_t r = 0;
1497
1498 if (tid != (mdb_tgt_tid_t)-1L)
1499 (void) mdb_tgt_getareg(t, tid, mdb_nv_get_name(v), &r);
1500
1501 return (r);
1502 }
1503
1504 static void
1505 reg_disc_set(mdb_var_t *v, uintmax_t r)
1506 {
1507 mdb_tgt_t *t = MDB_NV_COOKIE(v);
1508 mdb_tgt_tid_t tid = PTL_TID(t);
1509
1510 if (tid != (mdb_tgt_tid_t)-1L && mdb_tgt_putareg(t, tid,
1511 mdb_nv_get_name(v), r) == -1)
1512 mdb_warn("failed to modify %%%s register", mdb_nv_get_name(v));
1513 }
1514
1515 static void
1516 pt_print_reason(const lwpstatus_t *psp)
1517 {
1518 char name[SIG2STR_MAX + 4]; /* enough for SIG+name+\0, syscall or flt */
1519 const char *desc;
1520
1521 switch (psp->pr_why) {
1522 case PR_REQUESTED:
1523 mdb_printf("stopped by debugger");
1524 break;
1525 case PR_SIGNALLED:
1526 mdb_printf("stopped on %s (%s)", proc_signame(psp->pr_what,
1527 name, sizeof (name)), strsignal(psp->pr_what));
1528 break;
1529 case PR_SYSENTRY:
1530 mdb_printf("stopped on entry to %s system call",
1531 proc_sysname(psp->pr_what, name, sizeof (name)));
1532 break;
1533 case PR_SYSEXIT:
1534 mdb_printf("stopped on exit from %s system call",
1535 proc_sysname(psp->pr_what, name, sizeof (name)));
1536 break;
1537 case PR_JOBCONTROL:
1538 mdb_printf("stopped by job control");
1539 break;
1540 case PR_FAULTED:
1541 if (psp->pr_what == FLTBPT) {
1542 mdb_printf("stopped on a breakpoint");
1543 } else if (psp->pr_what == FLTWATCH) {
1544 switch (psp->pr_info.si_code) {
1545 case TRAP_RWATCH:
1546 desc = "read";
1547 break;
1548 case TRAP_WWATCH:
1549 desc = "write";
1550 break;
1551 case TRAP_XWATCH:
1552 desc = "execute";
1553 break;
1554 default:
1555 desc = "unknown";
1556 }
1557 mdb_printf("stopped %s a watchpoint (%s access to %p)",
1558 psp->pr_info.si_trapafter ? "after" : "on",
1559 desc, psp->pr_info.si_addr);
1560 } else if (psp->pr_what == FLTTRACE) {
1561 mdb_printf("stopped after a single-step");
1562 } else {
1563 mdb_printf("stopped on a %s fault",
1564 proc_fltname(psp->pr_what, name, sizeof (name)));
1565 }
1566 break;
1567 case PR_SUSPENDED:
1568 case PR_CHECKPOINT:
1569 mdb_printf("suspended by the kernel");
1570 break;
1571 default:
1572 mdb_printf("stopped for unknown reason (%d/%d)",
1573 psp->pr_why, psp->pr_what);
1574 }
1575 }
1576
1577 /*ARGSUSED*/
1578 static int
1579 pt_status_dcmd(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
1580 {
1581 mdb_tgt_t *t = mdb.m_target;
1582 struct ps_prochandle *P = t->t_pshandle;
1583 pt_data_t *pt = t->t_data;
1584
1585 if (P != NULL) {
1586 const psinfo_t *pip = Ppsinfo(P);
1587 const pstatus_t *psp = Pstatus(P);
1588 int cursig = 0, bits = 0, coredump = 0;
1589 int state;
1590 GElf_Sym sym;
1591 uintptr_t panicstr;
1592 char *panicbuf = mdb_alloc(PANIC_BUFSIZE, UM_SLEEP);
1593 const siginfo_t *sip = &(psp->pr_lwp.pr_info);
1594
1595 char execname[MAXPATHLEN], buf[BUFSIZ];
1596 char signame[SIG2STR_MAX + 4]; /* enough for SIG+name+\0 */
1597
1598 mdb_tgt_spec_desc_t desc;
1599 mdb_sespec_t *sep;
1600
1601 struct utsname uts;
1602 prcred_t cred;
1603 psinfo_t pi;
1604
1605 (void) strcpy(uts.nodename, "unknown machine");
1606 (void) Puname(P, &uts);
1607
1608 if (pip != NULL) {
1609 bcopy(pip, &pi, sizeof (psinfo_t));
1610 proc_unctrl_psinfo(&pi);
1611 } else
1612 bzero(&pi, sizeof (psinfo_t));
1613
1614 bits = pi.pr_dmodel == PR_MODEL_ILP32 ? 32 : 64;
1615
1616 state = Pstate(P);
1617 if (psp != NULL && state != PS_UNDEAD && state != PS_IDLE)
1618 cursig = psp->pr_lwp.pr_cursig;
1619
1620 if (state == PS_DEAD && pip != NULL) {
1621 mdb_printf("debugging core file of %s (%d-bit) "
1622 "from %s\n", pi.pr_fname, bits, uts.nodename);
1623
1624 } else if (state == PS_DEAD) {
1625 mdb_printf("debugging core file\n");
1626
1627 } else if (state == PS_IDLE) {
1628 const GElf_Ehdr *ehp = &pt->p_file->gf_ehdr;
1629
1630 mdb_printf("debugging %s file (%d-bit)\n",
1631 ehp->e_type == ET_EXEC ? "executable" : "object",
1632 ehp->e_ident[EI_CLASS] == ELFCLASS32 ? 32 : 64);
1633
1634 } else if (state == PS_UNDEAD && pi.pr_pid == 0) {
1635 mdb_printf("debugging defunct process\n");
1636
1637 } else {
1638 mdb_printf("debugging PID %d (%d-bit)\n",
1639 pi.pr_pid, bits);
1640 }
1641
1642 if (Pexecname(P, execname, sizeof (execname)) != NULL)
1643 mdb_printf("file: %s\n", execname);
1644
1645 if (pip != NULL && state == PS_DEAD)
1646 mdb_printf("initial argv: %s\n", pi.pr_psargs);
1647
1648 if (state != PS_UNDEAD && state != PS_IDLE) {
1649 mdb_printf("threading model: ");
1650 if (pt->p_ptl_ops == &proc_lwp_ops)
1651 mdb_printf("raw lwps\n");
1652 else
1653 mdb_printf("native threads\n");
1654 }
1655
1656 mdb_printf("status: ");
1657 switch (state) {
1658 case PS_RUN:
1659 ASSERT(!(psp->pr_flags & PR_STOPPED));
1660 mdb_printf("process is running");
1661 if (psp->pr_flags & PR_DSTOP)
1662 mdb_printf(", debugger stop directive pending");
1663 mdb_printf("\n");
1664 break;
1665
1666 case PS_STOP:
1667 ASSERT(psp->pr_flags & PR_STOPPED);
1668 pt_print_reason(&psp->pr_lwp);
1669
1670 if (psp->pr_flags & PR_DSTOP)
1671 mdb_printf(", debugger stop directive pending");
1672 if (psp->pr_flags & PR_ASLEEP)
1673 mdb_printf(", sleeping in %s system call",
1674 proc_sysname(psp->pr_lwp.pr_syscall,
1675 signame, sizeof (signame)));
1676
1677 mdb_printf("\n");
1678
1679 for (sep = t->t_matched; sep != T_SE_END;
1680 sep = sep->se_matched) {
1681 mdb_printf("event: %s\n", sep->se_ops->se_info(
1682 t, sep, mdb_list_next(&sep->se_velist),
1683 &desc, buf, sizeof (buf)));
1684 }
1685 break;
1686
1687 case PS_LOST:
1688 mdb_printf("debugger lost control of process\n");
1689 break;
1690
1691 case PS_UNDEAD:
1692 coredump = WIFSIGNALED(pi.pr_wstat) &&
1693 WCOREDUMP(pi.pr_wstat);
1694 /*FALLTHRU*/
1695
1696 case PS_DEAD:
1697 if (cursig == 0 && WIFSIGNALED(pi.pr_wstat))
1698 cursig = WTERMSIG(pi.pr_wstat);
1699 /*
1700 * We can only use pr_wstat == 0 as a test for gcore if
1701 * an NT_PRCRED note is present; these features were
1702 * added at the same time in Solaris 8.
1703 */
1704 if (pi.pr_wstat == 0 && Pstate(P) == PS_DEAD &&
1705 Pcred(P, &cred, 1) == 0) {
1706 mdb_printf("process core file generated "
1707 "with gcore(1)\n");
1708 } else if (cursig != 0) {
1709 mdb_printf("process terminated by %s (%s)",
1710 proc_signame(cursig, signame,
1711 sizeof (signame)), strsignal(cursig));
1712
1713 if (sip->si_signo != 0 && SI_FROMUSER(sip) &&
1714 sip->si_pid != 0) {
1715 mdb_printf(", pid=%d uid=%u",
1716 (int)sip->si_pid, sip->si_uid);
1717 if (sip->si_code != 0) {
1718 mdb_printf(" code=%d",
1719 sip->si_code);
1720 }
1721 } else {
1722 switch (sip->si_signo) {
1723 case SIGILL:
1724 case SIGTRAP:
1725 case SIGFPE:
1726 case SIGSEGV:
1727 case SIGBUS:
1728 case SIGEMT:
1729 mdb_printf(", addr=%p",
1730 sip->si_addr);
1731 default:
1732 break;
1733 }
1734 }
1735
1736 if (coredump)
1737 mdb_printf(" - core file dumped");
1738 mdb_printf("\n");
1739 } else {
1740 mdb_printf("process terminated with exit "
1741 "status %d\n", WEXITSTATUS(pi.pr_wstat));
1742 }
1743
1744 if (Plookup_by_name(t->t_pshandle, "libc.so",
1745 "panicstr", &sym) == 0 &&
1746 Pread(t->t_pshandle, &panicstr, sizeof (panicstr),
1747 sym.st_value) == sizeof (panicstr) &&
1748 Pread_string(t->t_pshandle, panicbuf,
1749 PANIC_BUFSIZE, panicstr) > 0) {
1750 mdb_printf("panic message: %s",
1751 panicbuf);
1752 }
1753
1754
1755 break;
1756
1757 case PS_IDLE:
1758 mdb_printf("idle\n");
1759 break;
1760
1761 default:
1762 mdb_printf("unknown libproc Pstate: %d\n", Pstate(P));
1763 }
1764 mdb_free(panicbuf, PANIC_BUFSIZE);
1765
1766 } else if (pt->p_file != NULL) {
1767 const GElf_Ehdr *ehp = &pt->p_file->gf_ehdr;
1768
1769 mdb_printf("debugging %s file (%d-bit)\n",
1770 ehp->e_type == ET_EXEC ? "executable" : "object",
1771 ehp->e_ident[EI_CLASS] == ELFCLASS32 ? 32 : 64);
1772 mdb_printf("executable file: %s\n", IOP_NAME(pt->p_fio));
1773 mdb_printf("status: idle\n");
1774 }
1775
1776 return (DCMD_OK);
1777 }
1778
1779 static int
1780 pt_tls(uintptr_t tid, uint_t flags, int argc, const mdb_arg_t *argv)
1781 {
1782 const char *name;
1783 const char *object;
1784 GElf_Sym sym;
1785 mdb_syminfo_t si;
1786 mdb_tgt_t *t = mdb.m_target;
1787
1788 if (!(flags & DCMD_ADDRSPEC) || argc > 1)
1789 return (DCMD_USAGE);
1790
1791 if (argc == 0) {
1792 psaddr_t b;
1793
1794 if (tlsbase(t, tid, PR_LMID_EVERY, MDB_TGT_OBJ_EXEC, &b) != 0) {
1795 mdb_warn("failed to lookup tlsbase for %r", tid);
1796 return (DCMD_ERR);
1797 }
1798
1799 mdb_printf("%lr\n", b);
1800 mdb_set_dot(b);
1801
1802 return (DCMD_OK);
1803 }
1804
1805 name = argv[0].a_un.a_str;
1806 object = MDB_TGT_OBJ_EVERY;
1807
1808 if (pt_lookup_by_name_thr(t, object, name, &sym, &si, tid) != 0) {
1809 mdb_warn("failed to lookup %s", name);
1810 return (DCMD_ABORT); /* avoid repeated failure */
1811 }
1812
1813 if (GELF_ST_TYPE(sym.st_info) != STT_TLS && DCMD_HDRSPEC(flags))
1814 mdb_warn("%s does not refer to thread local storage\n", name);
1815
1816 mdb_printf("%llr\n", sym.st_value);
1817 mdb_set_dot(sym.st_value);
1818
1819 return (DCMD_OK);
1820 }
1821
1822 /*ARGSUSED*/
1823 static int
1824 pt_tmodel(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
1825 {
1826 mdb_tgt_t *t = mdb.m_target;
1827 pt_data_t *pt = t->t_data;
1828 const pt_ptl_ops_t *ptl_ops;
1829
1830 if (argc != 1 || argv->a_type != MDB_TYPE_STRING)
1831 return (DCMD_USAGE);
1832
1833 if (strcmp(argv->a_un.a_str, "thread") == 0)
1834 ptl_ops = &proc_tdb_ops;
1835 else if (strcmp(argv->a_un.a_str, "lwp") == 0)
1836 ptl_ops = &proc_lwp_ops;
1837 else
1838 return (DCMD_USAGE);
1839
1840 if (t->t_pshandle != NULL && pt->p_ptl_ops != ptl_ops) {
1841 PTL_DTOR(t);
1842 pt->p_tdb_ops = NULL;
1843 pt->p_ptl_ops = &proc_lwp_ops;
1844 pt->p_ptl_hdl = NULL;
1845
1846 if (ptl_ops == &proc_tdb_ops) {
1847 (void) Pobject_iter(t->t_pshandle, (proc_map_f *)
1848 thr_check, t);
1849 }
1850 }
1851
1852 (void) mdb_tgt_status(t, &t->t_status);
1853 return (DCMD_OK);
1854 }
1855
1856 static const char *
1857 env_match(const char *cmp, const char *nameval)
1858 {
1859 const char *loc;
1860 size_t cmplen = strlen(cmp);
1861
1862 loc = strchr(nameval, '=');
1863 if (loc != NULL && (loc - nameval) == cmplen &&
1864 strncmp(nameval, cmp, cmplen) == 0) {
1865 return (loc + 1);
1866 }
1867
1868 return (NULL);
1869 }
1870
1871 /*ARGSUSED*/
1872 static int
1873 print_env(void *data, struct ps_prochandle *P, uintptr_t addr,
1874 const char *nameval)
1875 {
1876 const char *value;
1877
1878 if (nameval == NULL) {
1879 mdb_printf("<0x%p>\n", addr);
1880 } else {
1881 if (data == NULL)
1882 mdb_printf("%s\n", nameval);
1883 else if ((value = env_match(data, nameval)) != NULL)
1884 mdb_printf("%s\n", value);
1885 }
1886
1887 return (0);
1888 }
1889
1890 /*ARGSUSED*/
1891 static int
1892 pt_getenv(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
1893 {
1894 mdb_tgt_t *t = mdb.m_target;
1895 pt_data_t *pt = t->t_data;
1896 int i;
1897 uint_t opt_t = 0;
1898 mdb_var_t *v;
1899
1900 i = mdb_getopts(argc, argv,
1901 't', MDB_OPT_SETBITS, TRUE, &opt_t, NULL);
1902
1903 argc -= i;
1904 argv += i;
1905
1906 if ((flags & DCMD_ADDRSPEC) || argc > 1)
1907 return (DCMD_USAGE);
1908
1909 if (argc == 1 && argv->a_type != MDB_TYPE_STRING)
1910 return (DCMD_USAGE);
1911
1912 if (opt_t && t->t_pshandle == NULL) {
1913 mdb_warn("no process active\n");
1914 return (DCMD_ERR);
1915 }
1916
1917 if (opt_t && (Pstate(t->t_pshandle) == PS_IDLE ||
1918 Pstate(t->t_pshandle) == PS_UNDEAD)) {
1919 mdb_warn("-t option requires target to be running\n");
1920 return (DCMD_ERR);
1921 }
1922
1923 if (opt_t != 0) {
1924 if (Penv_iter(t->t_pshandle, print_env,
1925 argc == 0 ? NULL : (void *)argv->a_un.a_str) != 0)
1926 return (DCMD_ERR);
1927 } else if (argc == 1) {
1928 if ((v = mdb_nv_lookup(&pt->p_env, argv->a_un.a_str)) == NULL)
1929 return (DCMD_ERR);
1930
1931 ASSERT(strchr(mdb_nv_get_cookie(v), '=') != NULL);
1932 mdb_printf("%s\n", strchr(mdb_nv_get_cookie(v), '=') + 1);
1933 } else {
1934
1935 mdb_nv_rewind(&pt->p_env);
1936 while ((v = mdb_nv_advance(&pt->p_env)) != NULL)
1937 mdb_printf("%s\n", mdb_nv_get_cookie(v));
1938 }
1939
1940 return (DCMD_OK);
1941 }
1942
1943 /*
1944 * Function to set a variable in the internal environment, which is used when
1945 * creating new processes. Note that it is possible that 'nameval' can refer to
1946 * read-only memory, if mdb calls putenv() on an existing value before calling
1947 * this function. While we should avoid this situation, this function is
1948 * designed to be robust in the face of such changes.
1949 */
1950 static void
1951 pt_env_set(pt_data_t *pt, const char *nameval)
1952 {
1953 mdb_var_t *v;
1954 char *equals, *val;
1955 const char *name;
1956 size_t len;
1957
1958 if ((equals = strchr(nameval, '=')) != NULL) {
1959 val = strdup(nameval);
1960 equals = val + (equals - nameval);
1961 } else {
1962 /*
1963 * nameval doesn't contain an equals character. Convert this to
1964 * be 'nameval='.
1965 */
1966 len = strlen(nameval);
1967 val = mdb_alloc(len + 2, UM_SLEEP);
1968 (void) mdb_snprintf(val, len + 2, "%s=", nameval);
1969 equals = val + len;
1970 }
1971
1972 /* temporary truncate the string for lookup/insert */
1973 *equals = '\0';
1974 v = mdb_nv_lookup(&pt->p_env, val);
1975
1976 if (v != NULL) {
1977 char *old = mdb_nv_get_cookie(v);
1978 mdb_free(old, strlen(old) + 1);
1979 name = mdb_nv_get_name(v);
1980 } else {
1981 /*
1982 * The environment is created using MDB_NV_EXTNAME, so we must
1983 * provide external storage for the variable names.
1984 */
1985 name = strdup(val);
1986 }
1987
1988 *equals = '=';
1989
1990 (void) mdb_nv_insert(&pt->p_env, name, NULL, (uintptr_t)val,
1991 MDB_NV_EXTNAME);
1992
1993 if (equals)
1994 *equals = '=';
1995 }
1996
1997 /*
1998 * Clears the internal environment.
1999 */
2000 static void
2001 pt_env_clear(pt_data_t *pt)
2002 {
2003 mdb_var_t *v;
2004 char *val, *name;
2005
2006 mdb_nv_rewind(&pt->p_env);
2007 while ((v = mdb_nv_advance(&pt->p_env)) != NULL) {
2008
2009 name = (char *)mdb_nv_get_name(v);
2010 val = mdb_nv_get_cookie(v);
2011
2012 mdb_nv_remove(&pt->p_env, v);
2013
2014 mdb_free(name, strlen(name) + 1);
2015 mdb_free(val, strlen(val) + 1);
2016 }
2017 }
2018
2019 /*ARGSUSED*/
2020 static int
2021 pt_setenv(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
2022 {
2023 mdb_tgt_t *t = mdb.m_target;
2024 pt_data_t *pt = t->t_data;
2025 char *nameval;
2026 size_t len;
2027 int alloc;
2028
2029 if ((flags & DCMD_ADDRSPEC) || argc == 0 || argc > 2)
2030 return (DCMD_USAGE);
2031
2032 if ((argc > 0 && argv[0].a_type != MDB_TYPE_STRING) ||
2033 (argc > 1 && argv[1].a_type != MDB_TYPE_STRING))
2034 return (DCMD_USAGE);
2035
2036 if (t->t_pshandle == NULL) {
2037 mdb_warn("no process active\n");
2038 return (DCMD_ERR);
2039 }
2040
2041 /*
2042 * If the process is in some sort of running state, warn the user that
2043 * changes won't immediately take effect.
2044 */
2045 if (Pstate(t->t_pshandle) == PS_RUN ||
2046 Pstate(t->t_pshandle) == PS_STOP) {
2047 mdb_warn("warning: changes will not take effect until process"
2048 " is restarted\n");
2049 }
2050
2051 /*
2052 * We allow two forms of operation. The first is the usual "name=value"
2053 * parameter. We also allow the user to specify two arguments, where
2054 * the first is the name of the variable, and the second is the value.
2055 */
2056 alloc = 0;
2057 if (argc == 1) {
2058 nameval = (char *)argv->a_un.a_str;
2059 } else {
2060 len = strlen(argv[0].a_un.a_str) +
2061 strlen(argv[1].a_un.a_str) + 2;
2062 nameval = mdb_alloc(len, UM_SLEEP);
2063 (void) mdb_snprintf(nameval, len, "%s=%s", argv[0].a_un.a_str,
2064 argv[1].a_un.a_str);
2065 alloc = 1;
2066 }
2067
2068 pt_env_set(pt, nameval);
2069
2070 if (alloc)
2071 mdb_free(nameval, strlen(nameval) + 1);
2072
2073 return (DCMD_OK);
2074 }
2075
2076 /*ARGSUSED*/
2077 static int
2078 pt_unsetenv(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
2079 {
2080 mdb_tgt_t *t = mdb.m_target;
2081 pt_data_t *pt = t->t_data;
2082 mdb_var_t *v;
2083 char *value, *name;
2084
2085 if ((flags & DCMD_ADDRSPEC) || argc > 1)
2086 return (DCMD_USAGE);
2087
2088 if (argc == 1 && argv->a_type != MDB_TYPE_STRING)
2089 return (DCMD_USAGE);
2090
2091 if (t->t_pshandle == NULL) {
2092 mdb_warn("no process active\n");
2093 return (DCMD_ERR);
2094 }
2095
2096 /*
2097 * If the process is in some sort of running state, warn the user that
2098 * changes won't immediately take effect.
2099 */
2100 if (Pstate(t->t_pshandle) == PS_RUN ||
2101 Pstate(t->t_pshandle) == PS_STOP) {
2102 mdb_warn("warning: changes will not take effect until process"
2103 " is restarted\n");
2104 }
2105
2106 if (argc == 0) {
2107 pt_env_clear(pt);
2108 } else {
2109 if ((v = mdb_nv_lookup(&pt->p_env, argv->a_un.a_str)) != NULL) {
2110 name = (char *)mdb_nv_get_name(v);
2111 value = mdb_nv_get_cookie(v);
2112
2113 mdb_nv_remove(&pt->p_env, v);
2114
2115 mdb_free(name, strlen(name) + 1);
2116 mdb_free(value, strlen(value) + 1);
2117 }
2118 }
2119
2120 return (DCMD_OK);
2121 }
2122
2123 void
2124 getenv_help(void)
2125 {
2126 mdb_printf("-t show current process environment"
2127 " instead of initial environment.\n");
2128 }
2129
2130 static const mdb_dcmd_t pt_dcmds[] = {
2131 { "$c", "?[cnt]", "print stack backtrace", pt_stack },
2132 { "$C", "?[cnt]", "print stack backtrace", pt_stackv },
2133 { "$i", NULL, "print signals that are ignored", pt_ignored },
2134 { "$l", NULL, "print the representative thread's lwp id", pt_lwpid },
2135 { "$L", NULL, "print list of the active lwp ids", pt_lwpids },
2136 { "$r", "?[-u]", "print general-purpose registers", pt_regs },
2137 { "$x", "?", "print floating point registers", pt_fpregs },
2138 { "$X", "?", "print floating point registers", pt_fpregs },
2139 { "$y", "?", "print floating point registers", pt_fpregs },
2140 { "$Y", "?", "print floating point registers", pt_fpregs },
2141 { "$?", "?", "print status and registers", pt_regstatus },
2142 { ":A", "?[core|pid]", "attach to process or core file", pt_attach },
2143 { ":i", ":", "ignore signal (delete all matching events)", pt_ignore },
2144 { ":k", NULL, "forcibly kill and release target", pt_kill },
2145 { ":R", "[-a]", "release the previously attached process", pt_detach },
2146 { "attach", "?[core|pid]",
2147 "attach to process or core file", pt_attach },
2148 { "findstack", ":[-v]", "find user thread stack", pt_findstack },
2149 { "gcore", "[-o prefix] [-c content]",
2150 "produce a core file for the attached process", pt_gcore },
2151 { "getenv", "[-t] [name]", "display an environment variable",
2152 pt_getenv, getenv_help },
2153 { "kill", NULL, "forcibly kill and release target", pt_kill },
2154 { "release", "[-a]",
2155 "release the previously attached process", pt_detach },
2156 { "regs", "?[-u]", "print general-purpose registers", pt_regs },
2157 { "fpregs", "?[-dqs]", "print floating point registers", pt_fpregs },
2158 { "setenv", "name=value", "set an environment variable", pt_setenv },
2159 { "stack", "?[cnt]", "print stack backtrace", pt_stack },
2160 { "stackregs", "?", "print stack backtrace and registers", pt_stackr },
2161 { "status", NULL, "print summary of current target", pt_status_dcmd },
2162 { "tls", ":symbol",
2163 "lookup TLS data in the context of a given thread", pt_tls },
2164 { "tmodel", "{thread|lwp}", NULL, pt_tmodel },
2165 { "unsetenv", "[name]", "clear an environment variable", pt_unsetenv },
2166 { NULL }
2167 };
2168
2169 static void
2170 pt_thr_walk_fini(mdb_walk_state_t *wsp)
2171 {
2172 mdb_addrvec_destroy(wsp->walk_data);
2173 mdb_free(wsp->walk_data, sizeof (mdb_addrvec_t));
2174 }
2175
2176 static int
2177 pt_thr_walk_init(mdb_walk_state_t *wsp)
2178 {
2179 wsp->walk_data = mdb_zalloc(sizeof (mdb_addrvec_t), UM_SLEEP);
2180 mdb_addrvec_create(wsp->walk_data);
2181
2182 if (PTL_ITER(mdb.m_target, wsp->walk_data) == -1) {
2183 mdb_warn("failed to iterate over threads");
2184 pt_thr_walk_fini(wsp);
2185 return (WALK_ERR);
2186 }
2187
2188 return (WALK_NEXT);
2189 }
2190
2191 static int
2192 pt_thr_walk_step(mdb_walk_state_t *wsp)
2193 {
2194 if (mdb_addrvec_length(wsp->walk_data) != 0) {
2195 return (wsp->walk_callback(mdb_addrvec_shift(wsp->walk_data),
2196 NULL, wsp->walk_cbdata));
2197 }
2198 return (WALK_DONE);
2199 }
2200
2201 static const mdb_walker_t pt_walkers[] = {
2202 { "thread", "walk list of valid thread identifiers",
2203 pt_thr_walk_init, pt_thr_walk_step, pt_thr_walk_fini },
2204 { NULL }
2205 };
2206
2207 static int
2208 pt_agent_check(boolean_t *agent, const lwpstatus_t *psp)
2209 {
2210 if (psp->pr_flags & PR_AGENT)
2211 *agent = B_TRUE;
2212
2213 return (0);
2214 }
2215
2216 static void
2217 pt_activate_common(mdb_tgt_t *t)
2218 {
2219 pt_data_t *pt = t->t_data;
2220 boolean_t hasagent = B_FALSE;
2221 GElf_Sym sym;
2222
2223 /*
2224 * If we have a libproc handle and AT_BASE is set, the process or core
2225 * is dynamically linked. We call Prd_agent() to force libproc to
2226 * try to initialize librtld_db, and issue a warning if that fails.
2227 */
2228 if (t->t_pshandle != NULL && Pgetauxval(t->t_pshandle,
2229 AT_BASE) != -1L && Prd_agent(t->t_pshandle) == NULL) {
2230 mdb_warn("warning: librtld_db failed to initialize; shared "
2231 "library information will not be available\n");
2232 }
2233
2234 if (t->t_pshandle != NULL) {
2235 (void) Plwp_iter(t->t_pshandle,
2236 (proc_lwp_f *)pt_agent_check, &hasagent);
2237 }
2238
2239 if (hasagent) {
2240 mdb_warn("agent lwp detected; forcing "
2241 "lwp thread model (use ::tmodel to change)\n");
2242 } else if (t->t_pshandle != NULL && Pstate(t->t_pshandle) != PS_IDLE) {
2243 /*
2244 * If we have a libproc handle and we do not have an agent LWP,
2245 * look for the correct thread debugging library. (If we have
2246 * an agent LWP, we leave the model as the raw LWP model to
2247 * allow the agent LWP to be visible to the debugger.)
2248 */
2249 (void) Pobject_iter(t->t_pshandle, (proc_map_f *)thr_check, t);
2250 }
2251
2252 /*
2253 * If there's a global object named '_mdb_abort_info', assuming we're
2254 * debugging mdb itself and load the developer support module.
2255 */
2256 if (mdb_gelf_symtab_lookup_by_name(pt->p_symtab, "_mdb_abort_info",
2257 &sym, NULL) == 0 && GELF_ST_TYPE(sym.st_info) == STT_OBJECT) {
2258 if (mdb_module_load("mdb_ds", MDB_MOD_SILENT) < 0)
2259 mdb_warn("warning: failed to load developer support\n");
2260 }
2261
2262 mdb_tgt_elf_export(pt->p_file);
2263 }
2264
2265 static void
2266 pt_activate(mdb_tgt_t *t)
2267 {
2268 static const mdb_nv_disc_t reg_disc = { reg_disc_set, reg_disc_get };
2269
2270 pt_data_t *pt = t->t_data;
2271 struct utsname u1, u2;
2272 mdb_var_t *v;
2273 core_content_t content;
2274
2275 if (t->t_pshandle) {
2276 mdb_prop_postmortem = (Pstate(t->t_pshandle) == PS_DEAD);
2277 mdb_prop_kernel = FALSE;
2278 } else
2279 mdb_prop_kernel = mdb_prop_postmortem = FALSE;
2280
2281 mdb_prop_datamodel = MDB_TGT_MODEL_NATIVE;
2282
2283 /*
2284 * If we're examining a core file that doesn't contain program text,
2285 * and uname(2) doesn't match the NT_UTSNAME note recorded in the
2286 * core file, issue a warning.
2287 */
2288 if (mdb_prop_postmortem == TRUE &&
2289 ((content = Pcontent(t->t_pshandle)) == CC_CONTENT_INVALID ||
2290 !(content & CC_CONTENT_TEXT)) &&
2291 uname(&u1) >= 0 && Puname(t->t_pshandle, &u2) == 0 &&
2292 (strcmp(u1.release, u2.release) != 0 ||
2293 strcmp(u1.version, u2.version) != 0)) {
2294 mdb_warn("warning: core file is from %s %s %s; shared text "
2295 "mappings may not match installed libraries\n",
2296 u2.sysname, u2.release, u2.version);
2297 }
2298
2299 /*
2300 * Perform the common initialization tasks -- these are shared with
2301 * the pt_exec() and pt_run() subroutines.
2302 */
2303 pt_activate_common(t);
2304
2305 (void) mdb_tgt_register_dcmds(t, &pt_dcmds[0], MDB_MOD_FORCE);
2306 (void) mdb_tgt_register_walkers(t, &pt_walkers[0], MDB_MOD_FORCE);
2307
2308 /*
2309 * Iterate through our register description list and export
2310 * each register as a named variable.
2311 */
2312 mdb_nv_rewind(&pt->p_regs);
2313 while ((v = mdb_nv_advance(&pt->p_regs)) != NULL) {
2314 ushort_t rd_flags = MDB_TGT_R_FLAGS(mdb_nv_get_value(v));
2315
2316 if (!(rd_flags & MDB_TGT_R_EXPORT))
2317 continue; /* Don't export register as a variable */
2318
2319 (void) mdb_nv_insert(&mdb.m_nv, mdb_nv_get_name(v), ®_disc,
2320 (uintptr_t)t, MDB_NV_PERSIST);
2321 }
2322 }
2323
2324 static void
2325 pt_deactivate(mdb_tgt_t *t)
2326 {
2327 pt_data_t *pt = t->t_data;
2328 const mdb_dcmd_t *dcp;
2329 const mdb_walker_t *wp;
2330 mdb_var_t *v, *w;
2331
2332 mdb_nv_rewind(&pt->p_regs);
2333 while ((v = mdb_nv_advance(&pt->p_regs)) != NULL) {
2334 ushort_t rd_flags = MDB_TGT_R_FLAGS(mdb_nv_get_value(v));
2335
2336 if (!(rd_flags & MDB_TGT_R_EXPORT))
2337 continue; /* Didn't export register as a variable */
2338
2339 if (w = mdb_nv_lookup(&mdb.m_nv, mdb_nv_get_name(v))) {
2340 w->v_flags &= ~MDB_NV_PERSIST;
2341 mdb_nv_remove(&mdb.m_nv, w);
2342 }
2343 }
2344
2345 for (wp = &pt_walkers[0]; wp->walk_name != NULL; wp++) {
2346 if (mdb_module_remove_walker(t->t_module, wp->walk_name) == -1)
2347 warn("failed to remove walk %s", wp->walk_name);
2348 }
2349
2350 for (dcp = &pt_dcmds[0]; dcp->dc_name != NULL; dcp++) {
2351 if (mdb_module_remove_dcmd(t->t_module, dcp->dc_name) == -1)
2352 warn("failed to remove dcmd %s", dcp->dc_name);
2353 }
2354
2355 mdb_prop_postmortem = FALSE;
2356 mdb_prop_kernel = FALSE;
2357 mdb_prop_datamodel = MDB_TGT_MODEL_UNKNOWN;
2358 }
2359
2360 static void
2361 pt_periodic(mdb_tgt_t *t)
2362 {
2363 pt_data_t *pt = t->t_data;
2364
2365 if (pt->p_rdstate == PT_RD_CONSIST) {
2366 if (t->t_pshandle != NULL && Pstate(t->t_pshandle) < PS_LOST &&
2367 !(mdb.m_flags & MDB_FL_NOMODS)) {
2368 mdb_printf("%s: You've got symbols!\n", mdb.m_pname);
2369 mdb_module_load_all(0);
2370 }
2371 pt->p_rdstate = PT_RD_NONE;
2372 }
2373 }
2374
2375 static void
2376 pt_destroy(mdb_tgt_t *t)
2377 {
2378 pt_data_t *pt = t->t_data;
2379
2380 if (pt->p_idlehandle != NULL && pt->p_idlehandle != t->t_pshandle)
2381 Prelease(pt->p_idlehandle, 0);
2382
2383 if (t->t_pshandle != NULL) {
2384 PTL_DTOR(t);
2385 pt_release_parents(t);
2386 pt_pre_detach(t, TRUE);
2387 Prelease(t->t_pshandle, pt->p_rflags);
2388 }
2389
2390 mdb.m_flags &= ~(MDB_FL_VCREATE | MDB_FL_JOBCTL);
2391 pt_close_aout(t);
2392
2393 if (pt->p_aout_fio != NULL)
2394 mdb_io_rele(pt->p_aout_fio);
2395
2396 pt_env_clear(pt);
2397 mdb_nv_destroy(&pt->p_env);
2398
2399 mdb_nv_destroy(&pt->p_regs);
2400 mdb_free(pt, sizeof (pt_data_t));
2401 }
2402
2403 /*ARGSUSED*/
2404 static const char *
2405 pt_name(mdb_tgt_t *t)
2406 {
2407 return ("proc");
2408 }
2409
2410 static const char *
2411 pt_platform(mdb_tgt_t *t)
2412 {
2413 pt_data_t *pt = t->t_data;
2414
2415 if (t->t_pshandle != NULL &&
2416 Pplatform(t->t_pshandle, pt->p_platform, MAXNAMELEN) != NULL)
2417 return (pt->p_platform);
2418
2419 return (mdb_conf_platform());
2420 }
2421
2422 static int
2423 pt_uname(mdb_tgt_t *t, struct utsname *utsp)
2424 {
2425 if (t->t_pshandle != NULL)
2426 return (Puname(t->t_pshandle, utsp));
2427
2428 return (uname(utsp) >= 0 ? 0 : -1);
2429 }
2430
2431 static int
2432 pt_dmodel(mdb_tgt_t *t)
2433 {
2434 if (t->t_pshandle == NULL)
2435 return (MDB_TGT_MODEL_NATIVE);
2436
2437 switch (Pstatus(t->t_pshandle)->pr_dmodel) {
2438 case PR_MODEL_ILP32:
2439 return (MDB_TGT_MODEL_ILP32);
2440 case PR_MODEL_LP64:
2441 return (MDB_TGT_MODEL_LP64);
2442 }
2443
2444 return (MDB_TGT_MODEL_UNKNOWN);
2445 }
2446
2447 static ssize_t
2448 pt_vread(mdb_tgt_t *t, void *buf, size_t nbytes, uintptr_t addr)
2449 {
2450 ssize_t n;
2451
2452 /*
2453 * If no handle is open yet, reads from virtual addresses are
2454 * allowed to succeed but return zero-filled memory.
2455 */
2456 if (t->t_pshandle == NULL) {
2457 bzero(buf, nbytes);
2458 return (nbytes);
2459 }
2460
2461 if ((n = Pread(t->t_pshandle, buf, nbytes, addr)) <= 0)
2462 return (set_errno(EMDB_NOMAP));
2463
2464 return (n);
2465 }
2466
2467 static ssize_t
2468 pt_vwrite(mdb_tgt_t *t, const void *buf, size_t nbytes, uintptr_t addr)
2469 {
2470 ssize_t n;
2471
2472 /*
2473 * If no handle is open yet, writes to virtual addresses are
2474 * allowed to succeed but do not actually modify anything.
2475 */
2476 if (t->t_pshandle == NULL)
2477 return (nbytes);
2478
2479 n = Pwrite(t->t_pshandle, buf, nbytes, addr);
2480
2481 if (n == -1 && errno == EIO)
2482 return (set_errno(EMDB_NOMAP));
2483
2484 return (n);
2485 }
2486
2487 static ssize_t
2488 pt_fread(mdb_tgt_t *t, void *buf, size_t nbytes, uintptr_t addr)
2489 {
2490 pt_data_t *pt = t->t_data;
2491
2492 if (pt->p_file != NULL) {
2493 return (mdb_gelf_rw(pt->p_file, buf, nbytes, addr,
2494 IOPF_READ(pt->p_fio), GIO_READ));
2495 }
2496
2497 bzero(buf, nbytes);
2498 return (nbytes);
2499 }
2500
2501 static ssize_t
2502 pt_fwrite(mdb_tgt_t *t, const void *buf, size_t nbytes, uintptr_t addr)
2503 {
2504 pt_data_t *pt = t->t_data;
2505
2506 if (pt->p_file != NULL) {
2507 return (mdb_gelf_rw(pt->p_file, (void *)buf, nbytes, addr,
2508 IOPF_WRITE(pt->p_fio), GIO_WRITE));
2509 }
2510
2511 return (nbytes);
2512 }
2513
2514 static const char *
2515 pt_resolve_lmid(const char *object, Lmid_t *lmidp)
2516 {
2517 Lmid_t lmid = PR_LMID_EVERY;
2518 const char *p;
2519
2520 if (object == MDB_TGT_OBJ_EVERY || object == MDB_TGT_OBJ_EXEC)
2521 lmid = LM_ID_BASE; /* restrict scope to a.out's link map */
2522 else if (object != MDB_TGT_OBJ_RTLD && strncmp(object, "LM", 2) == 0 &&
2523 (p = strchr(object, '`')) != NULL) {
2524 object += 2; /* skip past initial "LM" prefix */
2525 lmid = strntoul(object, (size_t)(p - object), mdb.m_radix);
2526 object = p + 1; /* skip past link map specifier */
2527 }
2528
2529 *lmidp = lmid;
2530 return (object);
2531 }
2532
2533 static int
2534 tlsbase(mdb_tgt_t *t, mdb_tgt_tid_t tid, Lmid_t lmid, const char *object,
2535 psaddr_t *basep)
2536 {
2537 pt_data_t *pt = t->t_data;
2538 const rd_loadobj_t *loadobjp;
2539 td_thrhandle_t th;
2540 td_err_e err;
2541
2542 if (object == MDB_TGT_OBJ_EVERY)
2543 return (set_errno(EINVAL));
2544
2545 if (t->t_pshandle == NULL || Pstate(t->t_pshandle) == PS_IDLE)
2546 return (set_errno(EMDB_NOPROC));
2547
2548 if (pt->p_tdb_ops == NULL)
2549 return (set_errno(EMDB_TDB));
2550
2551 err = pt->p_tdb_ops->td_ta_map_id2thr(pt->p_ptl_hdl, tid, &th);
2552 if (err != TD_OK)
2553 return (set_errno(tdb_to_errno(err)));
2554
2555 /*
2556 * If this fails, rtld_db has failed to initialize properly.
2557 */
2558 if ((loadobjp = Plmid_to_loadobj(t->t_pshandle, lmid, object)) == NULL)
2559 return (set_errno(EMDB_NORTLD));
2560
2561 /*
2562 * This will fail if the TLS block has not been allocated for the
2563 * object that contains the TLS symbol in question.
2564 */
2565 err = pt->p_tdb_ops->td_thr_tlsbase(&th, loadobjp->rl_tlsmodid, basep);
2566 if (err != TD_OK)
2567 return (set_errno(tdb_to_errno(err)));
2568
2569 return (0);
2570 }
2571
2572 typedef struct {
2573 mdb_tgt_t *pl_tgt;
2574 const char *pl_name;
2575 Lmid_t pl_lmid;
2576 GElf_Sym *pl_symp;
2577 mdb_syminfo_t *pl_sip;
2578 mdb_tgt_tid_t pl_tid;
2579 mdb_bool_t pl_found;
2580 } pt_lookup_t;
2581
2582 /*ARGSUSED*/
2583 static int
2584 pt_lookup_cb(void *data, const prmap_t *pmp, const char *object)
2585 {
2586 pt_lookup_t *plp = data;
2587 struct ps_prochandle *P = plp->pl_tgt->t_pshandle;
2588 prsyminfo_t si;
2589 GElf_Sym sym;
2590
2591 if (Pxlookup_by_name(P, plp->pl_lmid, object, plp->pl_name, &sym,
2592 &si) != 0)
2593 return (0);
2594
2595 /*
2596 * If we encounter a match with SHN_UNDEF, keep looking for a
2597 * better match. Return the first match with SHN_UNDEF set if no
2598 * better match is found.
2599 */
2600 if (sym.st_shndx == SHN_UNDEF) {
2601 if (!plp->pl_found) {
2602 plp->pl_found = TRUE;
2603 *plp->pl_symp = sym;
2604 plp->pl_sip->sym_table = si.prs_table;
2605 plp->pl_sip->sym_id = si.prs_id;
2606 }
2607
2608 return (0);
2609 }
2610
2611 /*
2612 * Note that if the symbol's st_shndx is SHN_UNDEF we don't have the
2613 * TLS offset anyway, so adding in the tlsbase would be worthless.
2614 */
2615 if (GELF_ST_TYPE(sym.st_info) == STT_TLS &&
2616 plp->pl_tid != (mdb_tgt_tid_t)-1) {
2617 psaddr_t base;
2618
2619 if (tlsbase(plp->pl_tgt, plp->pl_tid, plp->pl_lmid, object,
2620 &base) != 0)
2621 return (-1); /* errno is set for us */
2622
2623 sym.st_value += base;
2624 }
2625
2626 plp->pl_found = TRUE;
2627 *plp->pl_symp = sym;
2628 plp->pl_sip->sym_table = si.prs_table;
2629 plp->pl_sip->sym_id = si.prs_id;
2630
2631 return (1);
2632 }
2633
2634 /*
2635 * Lookup the symbol with a thread context so that we can adjust TLS symbols
2636 * to get the values as they would appear in the context of the given thread.
2637 */
2638 static int
2639 pt_lookup_by_name_thr(mdb_tgt_t *t, const char *object,
2640 const char *name, GElf_Sym *symp, mdb_syminfo_t *sip, mdb_tgt_tid_t tid)
2641 {
2642 struct ps_prochandle *P = t->t_pshandle;
2643 pt_data_t *pt = t->t_data;
2644 Lmid_t lmid;
2645 uint_t i;
2646 const rd_loadobj_t *aout_lop;
2647
2648 object = pt_resolve_lmid(object, &lmid);
2649
2650 if (P != NULL) {
2651 pt_lookup_t pl;
2652
2653 pl.pl_tgt = t;
2654 pl.pl_name = name;
2655 pl.pl_lmid = lmid;
2656 pl.pl_symp = symp;
2657 pl.pl_sip = sip;
2658 pl.pl_tid = tid;
2659 pl.pl_found = FALSE;
2660
2661 if (object == MDB_TGT_OBJ_EVERY) {
2662 if (Pobject_iter_resolved(P, pt_lookup_cb, &pl) == -1)
2663 return (-1); /* errno is set for us */
2664 if ((!pl.pl_found) &&
2665 (Pobject_iter(P, pt_lookup_cb, &pl) == -1))
2666 return (-1); /* errno is set for us */
2667 } else {
2668 const prmap_t *pmp;
2669
2670 /*
2671 * This can fail either due to an invalid lmid or
2672 * an invalid object. To determine which is
2673 * faulty, we test the lmid against known valid
2674 * lmids and then see if using a wild-card lmid
2675 * improves ths situation.
2676 */
2677 if ((pmp = Plmid_to_map(P, lmid, object)) == NULL) {
2678 if (lmid != PR_LMID_EVERY &&
2679 lmid != LM_ID_BASE &&
2680 lmid != LM_ID_LDSO &&
2681 Plmid_to_map(P, PR_LMID_EVERY, object)
2682 != NULL)
2683 return (set_errno(EMDB_NOLMID));
2684 else
2685 return (set_errno(EMDB_NOOBJ));
2686 }
2687
2688 if (pt_lookup_cb(&pl, pmp, object) == -1)
2689 return (-1); /* errno is set for us */
2690 }
2691
2692 if (pl.pl_found)
2693 return (0);
2694 }
2695
2696 /*
2697 * If libproc doesn't have the symbols for rtld, we're cooked --
2698 * mdb doesn't have those symbols either.
2699 */
2700 if (object == MDB_TGT_OBJ_RTLD)
2701 return (set_errno(EMDB_NOSYM));
2702
2703 if (object != MDB_TGT_OBJ_EXEC && object != MDB_TGT_OBJ_EVERY) {
2704 int status = mdb_gelf_symtab_lookup_by_file(pt->p_symtab,
2705 object, name, symp, &sip->sym_id);
2706
2707 if (status != 0) {
2708 if (P != NULL &&
2709 Plmid_to_map(P, PR_LMID_EVERY, object) != NULL)
2710 return (set_errno(EMDB_NOSYM));
2711 else
2712 return (-1); /* errno set from lookup_by_file */
2713 }
2714
2715 goto found;
2716 }
2717
2718 if (mdb_gelf_symtab_lookup_by_name(pt->p_symtab, name, symp, &i) == 0) {
2719 sip->sym_table = MDB_TGT_SYMTAB;
2720 sip->sym_id = i;
2721 goto local_found;
2722 }
2723
2724 if (mdb_gelf_symtab_lookup_by_name(pt->p_dynsym, name, symp, &i) == 0) {
2725 sip->sym_table = MDB_TGT_DYNSYM;
2726 sip->sym_id = i;
2727 goto local_found;
2728 }
2729
2730 return (set_errno(EMDB_NOSYM));
2731
2732 local_found:
2733 if (pt->p_file != NULL &&
2734 pt->p_file->gf_ehdr.e_type == ET_DYN &&
2735 P != NULL &&
2736 (aout_lop = Pname_to_loadobj(P, PR_OBJ_EXEC)) != NULL)
2737 symp->st_value += aout_lop->rl_base;
2738
2739 found:
2740 /*
2741 * If the symbol has type TLS, libproc should have found the symbol
2742 * if it exists and has been allocated.
2743 */
2744 if (GELF_ST_TYPE(symp->st_info) == STT_TLS)
2745 return (set_errno(EMDB_TLS));
2746
2747 return (0);
2748 }
2749
2750 static int
2751 pt_lookup_by_name(mdb_tgt_t *t, const char *object,
2752 const char *name, GElf_Sym *symp, mdb_syminfo_t *sip)
2753 {
2754 return (pt_lookup_by_name_thr(t, object, name, symp, sip, PTL_TID(t)));
2755 }
2756
2757 static int
2758 pt_lookup_by_addr(mdb_tgt_t *t, uintptr_t addr, uint_t flags,
2759 char *buf, size_t nbytes, GElf_Sym *symp, mdb_syminfo_t *sip)
2760 {
2761 struct ps_prochandle *P = t->t_pshandle;
2762 pt_data_t *pt = t->t_data;
2763 rd_plt_info_t rpi = { 0 };
2764
2765 const char *pltsym;
2766 int rv, match, i;
2767
2768 mdb_gelf_symtab_t *gsts[3]; /* mdb.m_prsym, .symtab, .dynsym */
2769 int gstc = 0; /* number of valid gsts[] entries */
2770
2771 mdb_gelf_symtab_t *gst = NULL; /* set if 'sym' is from a gst */
2772 const prmap_t *pmp = NULL; /* set if 'sym' is from libproc */
2773 GElf_Sym sym; /* best symbol found so far if !exact */
2774 prsyminfo_t si;
2775
2776 /*
2777 * Fill in our array of symbol table pointers with the private symbol
2778 * table, static symbol table, and dynamic symbol table if applicable.
2779 * These are done in order of precedence so that if we match and
2780 * MDB_TGT_SYM_EXACT is set, we need not look any further.
2781 */
2782 if (mdb.m_prsym != NULL)
2783 gsts[gstc++] = mdb.m_prsym;
2784 if (P == NULL && pt->p_symtab != NULL)
2785 gsts[gstc++] = pt->p_symtab;
2786 if (P == NULL && pt->p_dynsym != NULL)
2787 gsts[gstc++] = pt->p_dynsym;
2788
2789 /*
2790 * Loop through our array attempting to match the address. If we match
2791 * and we're in exact mode, we're done. Otherwise save the symbol in
2792 * the local sym variable if it is closer than our previous match.
2793 * We explicitly watch for zero-valued symbols since DevPro insists
2794 * on storing __fsr_init_value's value as the symbol value instead
2795 * of storing it in a constant integer.
2796 */
2797 for (i = 0; i < gstc; i++) {
2798 if (mdb_gelf_symtab_lookup_by_addr(gsts[i], addr, flags, buf,
2799 nbytes, symp, &sip->sym_id) != 0 || symp->st_value == 0)
2800 continue;
2801
2802 if (flags & MDB_TGT_SYM_EXACT) {
2803 gst = gsts[i];
2804 goto found;
2805 }
2806
2807 if (gst == NULL || mdb_gelf_sym_closer(symp, &sym, addr)) {
2808 gst = gsts[i];
2809 sym = *symp;
2810 }
2811 }
2812
2813 /*
2814 * If we have no libproc handle active, we're done: fail if gst is
2815 * NULL; otherwise copy out our best symbol and skip to the end.
2816 * We also skip to found if gst is the private symbol table: we
2817 * want this to always take precedence over PLT re-vectoring.
2818 */
2819 if (P == NULL || (gst != NULL && gst == mdb.m_prsym)) {
2820 if (gst == NULL)
2821 return (set_errno(EMDB_NOSYMADDR));
2822 *symp = sym;
2823 goto found;
2824 }
2825
2826 /*
2827 * Check to see if the address is in a PLT: if it is, use librtld_db to
2828 * attempt to resolve the PLT entry. If the entry is bound, reset addr
2829 * to the bound address, add a special prefix to the caller's buf,
2830 * forget our previous guess, and then continue using the new addr.
2831 * If the entry is not bound, copy the corresponding symbol name into
2832 * buf and return a fake symbol for the given address.
2833 */
2834 if ((pltsym = Ppltdest(P, addr)) != NULL) {
2835 const rd_loadobj_t *rlp;
2836 rd_agent_t *rap;
2837
2838 if ((rap = Prd_agent(P)) != NULL &&
2839 (rlp = Paddr_to_loadobj(P, addr)) != NULL &&
2840 rd_plt_resolution(rap, addr, Pstatus(P)->pr_lwp.pr_lwpid,
2841 rlp->rl_plt_base, &rpi) == RD_OK &&
2842 (rpi.pi_flags & RD_FLG_PI_PLTBOUND)) {
2843 size_t n;
2844 n = mdb_iob_snprintf(buf, nbytes, "PLT=");
2845 addr = rpi.pi_baddr;
2846 if (n > nbytes) {
2847 buf += nbytes;
2848 nbytes = 0;
2849 } else {
2850 buf += n;
2851 nbytes -= n;
2852 }
2853 gst = NULL;
2854 } else {
2855 (void) mdb_iob_snprintf(buf, nbytes, "PLT:%s", pltsym);
2856 bzero(symp, sizeof (GElf_Sym));
2857 symp->st_value = addr;
2858 symp->st_info = GELF_ST_INFO(STB_GLOBAL, STT_FUNC);
2859 return (0);
2860 }
2861 }
2862
2863 /*
2864 * Ask libproc to convert the address to the closest symbol for us.
2865 * Once we get the closest symbol, we perform the EXACT match or
2866 * smart-mode or absolute distance check ourself:
2867 */
2868 if (PT_LIBPROC_RESOLVE(P)) {
2869 rv = Pxlookup_by_addr_resolved(P, addr, buf, nbytes,
2870 symp, &si);
2871 } else {
2872 rv = Pxlookup_by_addr(P, addr, buf, nbytes,
2873 symp, &si);
2874 }
2875 if ((rv == 0) && (symp->st_value != 0) &&
2876 (gst == NULL || mdb_gelf_sym_closer(symp, &sym, addr))) {
2877
2878 if (flags & MDB_TGT_SYM_EXACT)
2879 match = (addr == symp->st_value);
2880 else if (mdb.m_symdist == 0)
2881 match = (addr >= symp->st_value &&
2882 addr < symp->st_value + symp->st_size);
2883 else
2884 match = (addr >= symp->st_value &&
2885 addr < symp->st_value + mdb.m_symdist);
2886
2887 if (match) {
2888 pmp = Paddr_to_map(P, addr);
2889 gst = NULL;
2890 sip->sym_table = si.prs_table;
2891 sip->sym_id = si.prs_id;
2892 goto found;
2893 }
2894 }
2895
2896 /*
2897 * If we get here, Plookup_by_addr has failed us. If we have no
2898 * previous best symbol (gst == NULL), we've failed completely.
2899 * Otherwise we copy out that symbol and continue on to 'found'.
2900 */
2901 if (gst == NULL)
2902 return (set_errno(EMDB_NOSYMADDR));
2903 *symp = sym;
2904 found:
2905 /*
2906 * Once we've found something, copy the final name into the caller's
2907 * buffer and prefix it with the mapping name if appropriate.
2908 */
2909 if (pmp != NULL && pmp != Pname_to_map(P, PR_OBJ_EXEC)) {
2910 const char *prefix = pmp->pr_mapname;
2911 Lmid_t lmid;
2912
2913 if (PT_LIBPROC_RESOLVE(P)) {
2914 if (Pobjname_resolved(P, addr, pt->p_objname,
2915 MDB_TGT_MAPSZ))
2916 prefix = pt->p_objname;
2917 } else {
2918 if (Pobjname(P, addr, pt->p_objname, MDB_TGT_MAPSZ))
2919 prefix = pt->p_objname;
2920 }
2921
2922 if (buf != NULL && nbytes > 1) {
2923 (void) strncpy(pt->p_symname, buf, MDB_TGT_SYM_NAMLEN);
2924 pt->p_symname[MDB_TGT_SYM_NAMLEN - 1] = '\0';
2925 } else {
2926 pt->p_symname[0] = '\0';
2927 }
2928
2929 if (prefix == pt->p_objname && Plmid(P, addr, &lmid) == 0 && (
2930 (lmid != LM_ID_BASE && lmid != LM_ID_LDSO) ||
2931 (mdb.m_flags & MDB_FL_SHOWLMID))) {
2932 (void) mdb_iob_snprintf(buf, nbytes, "LM%lr`%s`%s",
2933 lmid, strbasename(prefix), pt->p_symname);
2934 } else {
2935 (void) mdb_iob_snprintf(buf, nbytes, "%s`%s",
2936 strbasename(prefix), pt->p_symname);
2937 }
2938
2939 } else if (gst != NULL && buf != NULL && nbytes > 0) {
2940 (void) strncpy(buf, mdb_gelf_sym_name(gst, symp), nbytes);
2941 buf[nbytes - 1] = '\0';
2942 }
2943
2944 return (0);
2945 }
2946
2947
2948 static int
2949 pt_symbol_iter_cb(void *arg, const GElf_Sym *sym, const char *name,
2950 const prsyminfo_t *sip)
2951 {
2952 pt_symarg_t *psp = arg;
2953
2954 psp->psym_info.sym_id = sip->prs_id;
2955
2956 return (psp->psym_func(psp->psym_private, sym, name, &psp->psym_info,
2957 psp->psym_obj));
2958 }
2959
2960 static int
2961 pt_objsym_iter(void *arg, const prmap_t *pmp, const char *object)
2962 {
2963 Lmid_t lmid = PR_LMID_EVERY;
2964 pt_symarg_t *psp = arg;
2965
2966 psp->psym_obj = object;
2967
2968 (void) Plmid(psp->psym_targ->t_pshandle, pmp->pr_vaddr, &lmid);
2969 (void) Pxsymbol_iter(psp->psym_targ->t_pshandle, lmid, object,
2970 psp->psym_which, psp->psym_type, pt_symbol_iter_cb, arg);
2971
2972 return (0);
2973 }
2974
2975 static int
2976 pt_symbol_filt(void *arg, const GElf_Sym *sym, const char *name, uint_t id)
2977 {
2978 pt_symarg_t *psp = arg;
2979
2980 if (mdb_tgt_sym_match(sym, psp->psym_type)) {
2981 psp->psym_info.sym_id = id;
2982 return (psp->psym_func(psp->psym_private, sym, name,
2983 &psp->psym_info, psp->psym_obj));
2984 }
2985
2986 return (0);
2987 }
2988
2989 static int
2990 pt_symbol_iter(mdb_tgt_t *t, const char *object, uint_t which,
2991 uint_t type, mdb_tgt_sym_f *func, void *private)
2992 {
2993 pt_data_t *pt = t->t_data;
2994 mdb_gelf_symtab_t *gst;
2995 pt_symarg_t ps;
2996 Lmid_t lmid;
2997
2998 object = pt_resolve_lmid(object, &lmid);
2999
3000 ps.psym_targ = t;
3001 ps.psym_which = which;
3002 ps.psym_type = type;
3003 ps.psym_func = func;
3004 ps.psym_private = private;
3005 ps.psym_obj = object;
3006
3007 if (t->t_pshandle != NULL) {
3008 if (object != MDB_TGT_OBJ_EVERY) {
3009 if (Plmid_to_map(t->t_pshandle, lmid, object) == NULL)
3010 return (set_errno(EMDB_NOOBJ));
3011 (void) Pxsymbol_iter(t->t_pshandle, lmid, object,
3012 which, type, pt_symbol_iter_cb, &ps);
3013 return (0);
3014 } else if (Prd_agent(t->t_pshandle) != NULL) {
3015 if (PT_LIBPROC_RESOLVE(t->t_pshandle)) {
3016 (void) Pobject_iter_resolved(t->t_pshandle,
3017 pt_objsym_iter, &ps);
3018 } else {
3019 (void) Pobject_iter(t->t_pshandle,
3020 pt_objsym_iter, &ps);
3021 }
3022 return (0);
3023 }
3024 }
3025
3026 if (lmid != LM_ID_BASE && lmid != PR_LMID_EVERY)
3027 return (set_errno(EMDB_NOLMID));
3028
3029 if (object != MDB_TGT_OBJ_EXEC && object != MDB_TGT_OBJ_EVERY &&
3030 pt->p_fio != NULL &&
3031 strcmp(object, IOP_NAME(pt->p_fio)) != 0)
3032 return (set_errno(EMDB_NOOBJ));
3033
3034 if (which == MDB_TGT_SYMTAB)
3035 gst = pt->p_symtab;
3036 else
3037 gst = pt->p_dynsym;
3038
3039 if (gst != NULL) {
3040 ps.psym_info.sym_table = gst->gst_tabid;
3041 mdb_gelf_symtab_iter(gst, pt_symbol_filt, &ps);
3042 }
3043
3044 return (0);
3045 }
3046
3047 static const mdb_map_t *
3048 pt_prmap_to_mdbmap(mdb_tgt_t *t, const prmap_t *prp, mdb_map_t *mp)
3049 {
3050 struct ps_prochandle *P = t->t_pshandle;
3051 char *rv, name[MAXPATHLEN];
3052 Lmid_t lmid;
3053
3054 if (PT_LIBPROC_RESOLVE(P)) {
3055 rv = Pobjname_resolved(P, prp->pr_vaddr, name, sizeof (name));
3056 } else {
3057 rv = Pobjname(P, prp->pr_vaddr, name, sizeof (name));
3058 }
3059
3060 if (rv != NULL) {
3061 if (Plmid(P, prp->pr_vaddr, &lmid) == 0 && (
3062 (lmid != LM_ID_BASE && lmid != LM_ID_LDSO) ||
3063 (mdb.m_flags & MDB_FL_SHOWLMID))) {
3064 (void) mdb_iob_snprintf(mp->map_name, MDB_TGT_MAPSZ,
3065 "LM%lr`%s", lmid, name);
3066 } else {
3067 (void) strncpy(mp->map_name, name, MDB_TGT_MAPSZ - 1);
3068 mp->map_name[MDB_TGT_MAPSZ - 1] = '\0';
3069 }
3070 } else {
3071 (void) strncpy(mp->map_name, prp->pr_mapname,
3072 MDB_TGT_MAPSZ - 1);
3073 mp->map_name[MDB_TGT_MAPSZ - 1] = '\0';
3074 }
3075
3076 mp->map_base = prp->pr_vaddr;
3077 mp->map_size = prp->pr_size;
3078 mp->map_flags = 0;
3079
3080 if (prp->pr_mflags & MA_READ)
3081 mp->map_flags |= MDB_TGT_MAP_R;
3082 if (prp->pr_mflags & MA_WRITE)
3083 mp->map_flags |= MDB_TGT_MAP_W;
3084 if (prp->pr_mflags & MA_EXEC)
3085 mp->map_flags |= MDB_TGT_MAP_X;
3086
3087 if (prp->pr_mflags & MA_SHM)
3088 mp->map_flags |= MDB_TGT_MAP_SHMEM;
3089 if (prp->pr_mflags & MA_BREAK)
3090 mp->map_flags |= MDB_TGT_MAP_HEAP;
3091 if (prp->pr_mflags & MA_STACK)
3092 mp->map_flags |= MDB_TGT_MAP_STACK;
3093 if (prp->pr_mflags & MA_ANON)
3094 mp->map_flags |= MDB_TGT_MAP_ANON;
3095
3096 return (mp);
3097 }
3098
3099 /*ARGSUSED*/
3100 static int
3101 pt_map_apply(void *arg, const prmap_t *prp, const char *name)
3102 {
3103 pt_maparg_t *pmp = arg;
3104 mdb_map_t map;
3105
3106 return (pmp->pmap_func(pmp->pmap_private,
3107 pt_prmap_to_mdbmap(pmp->pmap_targ, prp, &map), map.map_name));
3108 }
3109
3110 static int
3111 pt_mapping_iter(mdb_tgt_t *t, mdb_tgt_map_f *func, void *private)
3112 {
3113 if (t->t_pshandle != NULL) {
3114 pt_maparg_t pm;
3115
3116 pm.pmap_targ = t;
3117 pm.pmap_func = func;
3118 pm.pmap_private = private;
3119
3120 if (PT_LIBPROC_RESOLVE(t->t_pshandle)) {
3121 (void) Pmapping_iter_resolved(t->t_pshandle,
3122 pt_map_apply, &pm);
3123 } else {
3124 (void) Pmapping_iter(t->t_pshandle,
3125 pt_map_apply, &pm);
3126 }
3127 return (0);
3128 }
3129
3130 return (set_errno(EMDB_NOPROC));
3131 }
3132
3133 static int
3134 pt_object_iter(mdb_tgt_t *t, mdb_tgt_map_f *func, void *private)
3135 {
3136 pt_data_t *pt = t->t_data;
3137
3138 /*
3139 * If we have a libproc handle, we can just call Pobject_iter to
3140 * iterate over its list of load object information.
3141 */
3142 if (t->t_pshandle != NULL) {
3143 pt_maparg_t pm;
3144
3145 pm.pmap_targ = t;
3146 pm.pmap_func = func;
3147 pm.pmap_private = private;
3148
3149 if (PT_LIBPROC_RESOLVE(t->t_pshandle)) {
3150 (void) Pobject_iter_resolved(t->t_pshandle,
3151 pt_map_apply, &pm);
3152 } else {
3153 (void) Pobject_iter(t->t_pshandle,
3154 pt_map_apply, &pm);
3155 }
3156 return (0);
3157 }
3158
3159 /*
3160 * If we're examining an executable or other ELF file but we have no
3161 * libproc handle, fake up some information based on DT_NEEDED entries.
3162 */
3163 if (pt->p_dynsym != NULL && pt->p_file->gf_dyns != NULL &&
3164 pt->p_fio != NULL) {
3165 mdb_gelf_sect_t *gsp = pt->p_dynsym->gst_ssect;
3166 GElf_Dyn *dynp = pt->p_file->gf_dyns;
3167 mdb_map_t *mp = &pt->p_map;
3168 const char *s = IOP_NAME(pt->p_fio);
3169 size_t i;
3170
3171 (void) strncpy(mp->map_name, s, MDB_TGT_MAPSZ);
3172 mp->map_name[MDB_TGT_MAPSZ - 1] = '\0';
3173 mp->map_flags = MDB_TGT_MAP_R | MDB_TGT_MAP_X;
3174 mp->map_base = NULL;
3175 mp->map_size = 0;
3176
3177 if (func(private, mp, s) != 0)
3178 return (0);
3179
3180 for (i = 0; i < pt->p_file->gf_ndyns; i++, dynp++) {
3181 if (dynp->d_tag == DT_NEEDED) {
3182 s = (char *)gsp->gs_data + dynp->d_un.d_val;
3183 (void) strncpy(mp->map_name, s, MDB_TGT_MAPSZ);
3184 mp->map_name[MDB_TGT_MAPSZ - 1] = '\0';
3185 if (func(private, mp, s) != 0)
3186 return (0);
3187 }
3188 }
3189
3190 return (0);
3191 }
3192
3193 return (set_errno(EMDB_NOPROC));
3194 }
3195
3196 static const mdb_map_t *
3197 pt_addr_to_map(mdb_tgt_t *t, uintptr_t addr)
3198 {
3199 pt_data_t *pt = t->t_data;
3200 const prmap_t *pmp;
3201
3202 if (t->t_pshandle == NULL) {
3203 (void) set_errno(EMDB_NOPROC);
3204 return (NULL);
3205 }
3206
3207 if ((pmp = Paddr_to_map(t->t_pshandle, addr)) == NULL) {
3208 (void) set_errno(EMDB_NOMAP);
3209 return (NULL);
3210 }
3211
3212 return (pt_prmap_to_mdbmap(t, pmp, &pt->p_map));
3213 }
3214
3215 static const mdb_map_t *
3216 pt_name_to_map(mdb_tgt_t *t, const char *object)
3217 {
3218 pt_data_t *pt = t->t_data;
3219 const prmap_t *pmp;
3220 Lmid_t lmid;
3221
3222 if (t->t_pshandle == NULL) {
3223 (void) set_errno(EMDB_NOPROC);
3224 return (NULL);
3225 }
3226
3227 object = pt_resolve_lmid(object, &lmid);
3228
3229 if ((pmp = Plmid_to_map(t->t_pshandle, lmid, object)) == NULL) {
3230 (void) set_errno(EMDB_NOOBJ);
3231 return (NULL);
3232 }
3233
3234 return (pt_prmap_to_mdbmap(t, pmp, &pt->p_map));
3235 }
3236
3237 static ctf_file_t *
3238 pt_addr_to_ctf(mdb_tgt_t *t, uintptr_t addr)
3239 {
3240 ctf_file_t *ret;
3241
3242 if (t->t_pshandle == NULL) {
3243 (void) set_errno(EMDB_NOPROC);
3244 return (NULL);
3245 }
3246
3247 if ((ret = Paddr_to_ctf(t->t_pshandle, addr)) == NULL) {
3248 (void) set_errno(EMDB_NOOBJ);
3249 return (NULL);
3250 }
3251
3252 return (ret);
3253 }
3254
3255 static ctf_file_t *
3256 pt_name_to_ctf(mdb_tgt_t *t, const char *name)
3257 {
3258 ctf_file_t *ret;
3259
3260 if (t->t_pshandle == NULL) {
3261 (void) set_errno(EMDB_NOPROC);
3262 return (NULL);
3263 }
3264
3265 if ((ret = Pname_to_ctf(t->t_pshandle, name)) == NULL) {
3266 (void) set_errno(EMDB_NOOBJ);
3267 return (NULL);
3268 }
3269
3270 return (ret);
3271 }
3272
3273 static int
3274 pt_status(mdb_tgt_t *t, mdb_tgt_status_t *tsp)
3275 {
3276 const pstatus_t *psp;
3277 prgregset_t gregs;
3278 int state;
3279
3280 bzero(tsp, sizeof (mdb_tgt_status_t));
3281
3282 if (t->t_pshandle == NULL) {
3283 tsp->st_state = MDB_TGT_IDLE;
3284 return (0);
3285 }
3286
3287 switch (state = Pstate(t->t_pshandle)) {
3288 case PS_RUN:
3289 tsp->st_state = MDB_TGT_RUNNING;
3290 break;
3291
3292 case PS_STOP:
3293 tsp->st_state = MDB_TGT_STOPPED;
3294 psp = Pstatus(t->t_pshandle);
3295
3296 tsp->st_tid = PTL_TID(t);
3297 if (PTL_GETREGS(t, tsp->st_tid, gregs) == 0)
3298 tsp->st_pc = gregs[R_PC];
3299
3300 if (psp->pr_flags & PR_ISTOP)
3301 tsp->st_flags |= MDB_TGT_ISTOP;
3302 if (psp->pr_flags & PR_DSTOP)
3303 tsp->st_flags |= MDB_TGT_DSTOP;
3304
3305 break;
3306
3307 case PS_LOST:
3308 tsp->st_state = MDB_TGT_LOST;
3309 break;
3310 case PS_UNDEAD:
3311 tsp->st_state = MDB_TGT_UNDEAD;
3312 break;
3313 case PS_DEAD:
3314 tsp->st_state = MDB_TGT_DEAD;
3315 break;
3316 case PS_IDLE:
3317 tsp->st_state = MDB_TGT_IDLE;
3318 break;
3319 default:
3320 fail("unknown libproc state (%d)\n", state);
3321 }
3322
3323 if (t->t_flags & MDB_TGT_F_BUSY)
3324 tsp->st_flags |= MDB_TGT_BUSY;
3325
3326 return (0);
3327 }
3328
3329 static void
3330 pt_dupfd(const char *file, int oflags, mode_t mode, int dfd)
3331 {
3332 int fd;
3333
3334 if ((fd = open(file, oflags, mode)) >= 0) {
3335 (void) fcntl(fd, F_DUP2FD, dfd);
3336 (void) close(fd);
3337 } else
3338 warn("failed to open %s as descriptor %d", file, dfd);
3339 }
3340
3341 /*
3342 * The Pcreate_callback() function interposes on the default, empty libproc
3343 * definition. It will be called following a fork of a new child process by
3344 * Pcreate() below, but before the exec of the new process image. We use this
3345 * callback to optionally redirect stdin and stdout and reset the dispositions
3346 * of SIGPIPE and SIGQUIT from SIG_IGN back to SIG_DFL.
3347 */
3348 /*ARGSUSED*/
3349 void
3350 Pcreate_callback(struct ps_prochandle *P)
3351 {
3352 pt_data_t *pt = mdb.m_target->t_data;
3353
3354 if (pt->p_stdin != NULL)
3355 pt_dupfd(pt->p_stdin, O_RDWR, 0, STDIN_FILENO);
3356 if (pt->p_stdout != NULL)
3357 pt_dupfd(pt->p_stdout, O_CREAT | O_WRONLY, 0666, STDOUT_FILENO);
3358
3359 (void) mdb_signal_sethandler(SIGPIPE, SIG_DFL, NULL);
3360 (void) mdb_signal_sethandler(SIGQUIT, SIG_DFL, NULL);
3361 }
3362
3363 static int
3364 pt_run(mdb_tgt_t *t, int argc, const mdb_arg_t *argv)
3365 {
3366 pt_data_t *pt = t->t_data;
3367 struct ps_prochandle *P;
3368 char execname[MAXPATHLEN];
3369 const char **pargv;
3370 int pargc = 0;
3371 int i, perr;
3372 char **penv;
3373 mdb_var_t *v;
3374
3375 if (pt->p_aout_fio == NULL) {
3376 warn("run requires executable to be specified on "
3377 "command-line\n");
3378 return (set_errno(EMDB_TGT));
3379 }
3380
3381 pargv = mdb_alloc(sizeof (char *) * (argc + 2), UM_SLEEP);
3382 pargv[pargc++] = strbasename(IOP_NAME(pt->p_aout_fio));
3383
3384 for (i = 0; i < argc; i++) {
3385 if (argv[i].a_type != MDB_TYPE_STRING) {
3386 mdb_free(pargv, sizeof (char *) * (argc + 2));
3387 return (set_errno(EINVAL));
3388 }
3389 if (argv[i].a_un.a_str[0] == '<')
3390 pt->p_stdin = argv[i].a_un.a_str + 1;
3391 else if (argv[i].a_un.a_str[0] == '>')
3392 pt->p_stdout = argv[i].a_un.a_str + 1;
3393 else
3394 pargv[pargc++] = argv[i].a_un.a_str;
3395 }
3396 pargv[pargc] = NULL;
3397
3398 /*
3399 * Since Pcreate() uses execvp() and "." may not be present in $PATH,
3400 * we must manually prepend "./" when the executable is a simple name.
3401 */
3402 if (strchr(IOP_NAME(pt->p_aout_fio), '/') == NULL) {
3403 (void) snprintf(execname, sizeof (execname), "./%s",
3404 IOP_NAME(pt->p_aout_fio));
3405 } else {
3406 (void) snprintf(execname, sizeof (execname), "%s",
3407 IOP_NAME(pt->p_aout_fio));
3408 }
3409
3410 penv = mdb_alloc((mdb_nv_size(&pt->p_env)+ 1) * sizeof (char *),
3411 UM_SLEEP);
3412 for (mdb_nv_rewind(&pt->p_env), i = 0;
3413 (v = mdb_nv_advance(&pt->p_env)) != NULL; i++)
3414 penv[i] = mdb_nv_get_cookie(v);
3415 penv[i] = NULL;
3416
3417 P = Pxcreate(execname, (char **)pargv, penv, &perr, NULL, 0);
3418 mdb_free(pargv, sizeof (char *) * (argc + 2));
3419 pt->p_stdin = pt->p_stdout = NULL;
3420
3421 mdb_free(penv, i * sizeof (char *));
3422
3423 if (P == NULL) {
3424 warn("failed to create process: %s\n", Pcreate_error(perr));
3425 return (set_errno(EMDB_TGT));
3426 }
3427
3428 if (t->t_pshandle != NULL) {
3429 pt_pre_detach(t, TRUE);
3430 if (t->t_pshandle != pt->p_idlehandle)
3431 Prelease(t->t_pshandle, pt->p_rflags);
3432 }
3433
3434 (void) Punsetflags(P, PR_RLC); /* make sure run-on-last-close is off */
3435 (void) Psetflags(P, PR_KLC); /* kill on last close by debugger */
3436 pt->p_rflags = PRELEASE_KILL; /* kill on debugger Prelease */
3437 t->t_pshandle = P;
3438
3439 pt_post_attach(t);
3440 pt_activate_common(t);
3441 (void) mdb_tgt_status(t, &t->t_status);
3442 mdb.m_flags |= MDB_FL_VCREATE;
3443
3444 return (0);
3445 }
3446
3447 /*
3448 * Forward a signal to the victim process in order to force it to stop or die.
3449 * Refer to the comments above pt_setrun(), below, for more info.
3450 */
3451 /*ARGSUSED*/
3452 static void
3453 pt_sigfwd(int sig, siginfo_t *sip, ucontext_t *ucp, mdb_tgt_t *t)
3454 {
3455 struct ps_prochandle *P = t->t_pshandle;
3456 const lwpstatus_t *psp = &Pstatus(P)->pr_lwp;
3457 pid_t pid = Pstatus(P)->pr_pid;
3458 long ctl[2];
3459
3460 if (getpgid(pid) != mdb.m_pgid) {
3461 mdb_dprintf(MDB_DBG_TGT, "fwd SIG#%d to %d\n", sig, (int)pid);
3462 (void) kill(pid, sig);
3463 }
3464
3465 if (Pwait(P, 1) == 0 && (psp->pr_flags & PR_STOPPED) &&
3466 psp->pr_why == PR_JOBCONTROL && Pdstop(P) == 0) {
3467 /*
3468 * If we're job control stopped and our DSTOP is pending, the
3469 * victim will never see our signal, so undo the kill() and
3470 * then send SIGCONT the victim to kick it out of the job
3471 * control stop and force our DSTOP to take effect.
3472 */
3473 if ((psp->pr_flags & PR_DSTOP) &&
3474 prismember(&Pstatus(P)->pr_sigpend, sig)) {
3475 ctl[0] = PCUNKILL;
3476 ctl[1] = sig;
3477 (void) write(Pctlfd(P), ctl, sizeof (ctl));
3478 }
3479
3480 mdb_dprintf(MDB_DBG_TGT, "fwd SIGCONT to %d\n", (int)pid);
3481 (void) kill(pid, SIGCONT);
3482 }
3483 }
3484
3485 /*
3486 * Common code for step and continue: if no victim process has been created,
3487 * call pt_run() to create one. Then set the victim running, clearing any
3488 * pending fault. One special case is that if the victim was previously
3489 * stopped on reception of SIGINT, we know that SIGINT was traced and the user
3490 * requested the victim to stop, so clear this signal before continuing.
3491 * For all other traced signals, the signal will be delivered on continue.
3492 *
3493 * Once the victim process is running, we wait for it to stop on an event of
3494 * interest. Although libproc provides the basic primitive to wait for the
3495 * victim, we must be careful in our handling of signals. We want to allow the
3496 * user to issue a SIGINT or SIGQUIT using the designated terminal control
3497 * character (typically ^C and ^\), and have these signals stop the target and
3498 * return control to the debugger if the signals are traced. There are three
3499 * cases to be considered in our implementation:
3500 *
3501 * (1) If the debugger and victim are in the same process group, both receive
3502 * the signal from the terminal driver. The debugger returns from Pwait() with
3503 * errno = EINTR, so we want to loop back and continue waiting until the victim
3504 * stops on receipt of its SIGINT or SIGQUIT.
3505 *
3506 * (2) If the debugger and victim are in different process groups, and the
3507 * victim is a member of the foreground process group, it will receive the
3508 * signal from the terminal driver and the debugger will not. As such, we
3509 * will remain blocked in Pwait() until the victim stops on its signal.
3510 *
3511 * (3) If the debugger and victim are in different process groups, and the
3512 * debugger is a member of the foreground process group, it will receive the
3513 * signal from the terminal driver, and the victim will not. The debugger
3514 * returns from Pwait() with errno = EINTR, so we need to forward the signal
3515 * to the victim process directly and then Pwait() again for it to stop.
3516 *
3517 * We can observe that all three cases are handled by simply calling Pwait()
3518 * repeatedly if it fails with EINTR, and forwarding SIGINT and SIGQUIT to
3519 * the victim if it is in a different process group, using pt_sigfwd() above.
3520 *
3521 * An additional complication is that the process may not be able to field
3522 * the signal if it is currently stopped by job control. In this case, we
3523 * also DSTOP the process, and then send it a SIGCONT to wake it up from
3524 * job control and force it to re-enter stop() under the control of /proc.
3525 *
3526 * Finally, we would like to allow the user to suspend the process using the
3527 * terminal suspend character (typically ^Z) if both are in the same session.
3528 * We again employ pt_sigfwd() to forward SIGTSTP to the victim, wait for it to
3529 * stop from job control, and then capture it using /proc. Once the process
3530 * has stopped, normal SIGTSTP processing is restored and the user can issue
3531 * another ^Z in order to suspend the debugger and return to the parent shell.
3532 */
3533 static int
3534 pt_setrun(mdb_tgt_t *t, mdb_tgt_status_t *tsp, int flags)
3535 {
3536 struct ps_prochandle *P = t->t_pshandle;
3537 pt_data_t *pt = t->t_data;
3538 pid_t old_pgid = -1;
3539
3540 mdb_signal_f *intf, *quitf, *tstpf;
3541 const lwpstatus_t *psp;
3542 void *intd, *quitd, *tstpd;
3543
3544 int sig = pt->p_signal;
3545 int error = 0;
3546 int pgid = -1;
3547
3548 pt->p_signal = 0; /* clear pending signal */
3549
3550 if (P == NULL && pt_run(t, 0, NULL) == -1)
3551 return (-1); /* errno is set for us */
3552
3553 P = t->t_pshandle;
3554 psp = &Pstatus(P)->pr_lwp;
3555
3556 if (sig == 0 && psp->pr_why == PR_SIGNALLED && psp->pr_what == SIGINT)
3557 flags |= PRCSIG; /* clear pending SIGINT */
3558 else
3559 flags |= PRCFAULT; /* clear any pending fault (e.g. BPT) */
3560
3561 intf = mdb_signal_gethandler(SIGINT, &intd);
3562 quitf = mdb_signal_gethandler(SIGQUIT, &quitd);
3563 tstpf = mdb_signal_gethandler(SIGTSTP, &tstpd);
3564
3565 (void) mdb_signal_sethandler(SIGINT, (mdb_signal_f *)pt_sigfwd, t);
3566 (void) mdb_signal_sethandler(SIGQUIT, (mdb_signal_f *)pt_sigfwd, t);
3567 (void) mdb_signal_sethandler(SIGTSTP, (mdb_signal_f *)pt_sigfwd, t);
3568
3569 if (sig != 0 && Pstate(P) == PS_RUN &&
3570 kill(Pstatus(P)->pr_pid, sig) == -1) {
3571 error = errno;
3572 goto out;
3573 }
3574
3575 /*
3576 * If we attached to a job stopped background process in the same
3577 * session, make its pgid the foreground process group before running
3578 * it. Ignore SIGTTOU while doing this to avoid being suspended.
3579 */
3580 if (mdb.m_flags & MDB_FL_JOBCTL) {
3581 (void) mdb_signal_sethandler(SIGTTOU, SIG_IGN, NULL);
3582 (void) IOP_CTL(mdb.m_term, TIOCGPGRP, &old_pgid);
3583 (void) IOP_CTL(mdb.m_term, TIOCSPGRP,
3584 (void *)&Pstatus(P)->pr_pgid);
3585 (void) mdb_signal_sethandler(SIGTTOU, SIG_DFL, NULL);
3586 }
3587
3588 if (Pstate(P) != PS_RUN && Psetrun(P, sig, flags) == -1) {
3589 error = errno;
3590 goto out;
3591 }
3592
3593 /*
3594 * If the process is stopped on job control, resume its process group
3595 * by sending it a SIGCONT if we are in the same session. Otherwise
3596 * we have no choice but to wait for someone else to foreground it.
3597 */
3598 if (psp->pr_why == PR_JOBCONTROL) {
3599 if (mdb.m_flags & MDB_FL_JOBCTL)
3600 (void) kill(-Pstatus(P)->pr_pgid, SIGCONT);
3601 else if (mdb.m_term != NULL)
3602 warn("process is still suspended by job control ...\n");
3603 }
3604
3605 /*
3606 * Wait for the process to stop. As described above, we loop around if
3607 * we are interrupted (EINTR). If we lose control, attempt to re-open
3608 * the process, or call pt_exec() if that fails to handle a re-exec.
3609 * If the process dies (ENOENT) or Pwait() fails, break out of the loop.
3610 */
3611 while (Pwait(P, 0) == -1) {
3612 if (errno != EINTR) {
3613 if (Pstate(P) == PS_LOST) {
3614 if (Preopen(P) == 0)
3615 continue; /* Pwait() again */
3616 else
3617 pt_exec(t, 0, NULL);
3618 } else if (errno != ENOENT)
3619 warn("failed to wait for event");
3620 break;
3621 }
3622 }
3623
3624 /*
3625 * If we changed the foreground process group, restore the old pgid
3626 * while ignoring SIGTTOU so we are not accidentally suspended.
3627 */
3628 if (old_pgid != -1) {
3629 (void) mdb_signal_sethandler(SIGTTOU, SIG_IGN, NULL);
3630 (void) IOP_CTL(mdb.m_term, TIOCSPGRP, &pgid);
3631 (void) mdb_signal_sethandler(SIGTTOU, SIG_DFL, NULL);
3632 }
3633
3634 /*
3635 * If we're now stopped on exit from a successful exec, release any
3636 * vfork parents and clean out their address space before returning
3637 * to tgt_continue() and perturbing the list of armed event specs.
3638 * If we're stopped for any other reason, just update the mappings.
3639 */
3640 switch (Pstate(P)) {
3641 case PS_STOP:
3642 if (psp->pr_why == PR_SYSEXIT && psp->pr_errno == 0 &&
3643 psp->pr_what == SYS_execve)
3644 pt_release_parents(t);
3645 else
3646 Pupdate_maps(P);
3647 break;
3648
3649 case PS_UNDEAD:
3650 case PS_LOST:
3651 pt_release_parents(t);
3652 break;
3653 }
3654
3655 out:
3656 (void) mdb_signal_sethandler(SIGINT, intf, intd);
3657 (void) mdb_signal_sethandler(SIGQUIT, quitf, quitd);
3658 (void) mdb_signal_sethandler(SIGTSTP, tstpf, tstpd);
3659 (void) pt_status(t, tsp);
3660
3661 return (error ? set_errno(error) : 0);
3662 }
3663
3664 static int
3665 pt_step(mdb_tgt_t *t, mdb_tgt_status_t *tsp)
3666 {
3667 return (pt_setrun(t, tsp, PRSTEP));
3668 }
3669
3670 static int
3671 pt_continue(mdb_tgt_t *t, mdb_tgt_status_t *tsp)
3672 {
3673 return (pt_setrun(t, tsp, 0));
3674 }
3675
3676 static int
3677 pt_signal(mdb_tgt_t *t, int sig)
3678 {
3679 pt_data_t *pt = t->t_data;
3680
3681 if (sig > 0 && sig <= pt->p_maxsig) {
3682 pt->p_signal = sig; /* pending until next pt_setrun */
3683 return (0);
3684 }
3685
3686 return (set_errno(EMDB_BADSIGNUM));
3687 }
3688
3689 static int
3690 pt_sysenter_ctor(mdb_tgt_t *t, mdb_sespec_t *sep, void *args)
3691 {
3692 struct ps_prochandle *P = t->t_pshandle;
3693
3694 if (P != NULL && Pstate(P) < PS_LOST) {
3695 sep->se_data = args; /* data is raw system call number */
3696 return (Psysentry(P, (intptr_t)args, TRUE) < 0 ? -1 : 0);
3697 }
3698
3699 return (set_errno(EMDB_NOPROC));
3700 }
3701
3702 static void
3703 pt_sysenter_dtor(mdb_tgt_t *t, mdb_sespec_t *sep)
3704 {
3705 (void) Psysentry(t->t_pshandle, (intptr_t)sep->se_data, FALSE);
3706 }
3707
3708 /*ARGSUSED*/
3709 static char *
3710 pt_sysenter_info(mdb_tgt_t *t, mdb_sespec_t *sep, mdb_vespec_t *vep,
3711 mdb_tgt_spec_desc_t *sp, char *buf, size_t nbytes)
3712 {
3713 char name[32];
3714 int sysnum;
3715
3716 if (vep != NULL)
3717 sysnum = (intptr_t)vep->ve_args;
3718 else
3719 sysnum = (intptr_t)sep->se_data;
3720
3721 (void) proc_sysname(sysnum, name, sizeof (name));
3722 (void) mdb_iob_snprintf(buf, nbytes, "stop on entry to %s", name);
3723
3724 return (buf);
3725 }
3726
3727 /*ARGSUSED*/
3728 static int
3729 pt_sysenter_match(mdb_tgt_t *t, mdb_sespec_t *sep, mdb_tgt_status_t *tsp)
3730 {
3731 const lwpstatus_t *psp = &Pstatus(t->t_pshandle)->pr_lwp;
3732 int sysnum = (intptr_t)sep->se_data;
3733
3734 return (psp->pr_why == PR_SYSENTRY && psp->pr_what == sysnum);
3735 }
3736
3737 static const mdb_se_ops_t proc_sysenter_ops = {
3738 pt_sysenter_ctor, /* se_ctor */
3739 pt_sysenter_dtor, /* se_dtor */
3740 pt_sysenter_info, /* se_info */
3741 no_se_secmp, /* se_secmp */
3742 no_se_vecmp, /* se_vecmp */
3743 no_se_arm, /* se_arm */
3744 no_se_disarm, /* se_disarm */
3745 no_se_cont, /* se_cont */
3746 pt_sysenter_match /* se_match */
3747 };
3748
3749 static int
3750 pt_sysexit_ctor(mdb_tgt_t *t, mdb_sespec_t *sep, void *args)
3751 {
3752 struct ps_prochandle *P = t->t_pshandle;
3753
3754 if (P != NULL && Pstate(P) < PS_LOST) {
3755 sep->se_data = args; /* data is raw system call number */
3756 return (Psysexit(P, (intptr_t)args, TRUE) < 0 ? -1 : 0);
3757 }
3758
3759 return (set_errno(EMDB_NOPROC));
3760 }
3761
3762 static void
3763 pt_sysexit_dtor(mdb_tgt_t *t, mdb_sespec_t *sep)
3764 {
3765 (void) Psysexit(t->t_pshandle, (intptr_t)sep->se_data, FALSE);
3766 }
3767
3768 /*ARGSUSED*/
3769 static char *
3770 pt_sysexit_info(mdb_tgt_t *t, mdb_sespec_t *sep, mdb_vespec_t *vep,
3771 mdb_tgt_spec_desc_t *sp, char *buf, size_t nbytes)
3772 {
3773 char name[32];
3774 int sysnum;
3775
3776 if (vep != NULL)
3777 sysnum = (intptr_t)vep->ve_args;
3778 else
3779 sysnum = (intptr_t)sep->se_data;
3780
3781 (void) proc_sysname(sysnum, name, sizeof (name));
3782 (void) mdb_iob_snprintf(buf, nbytes, "stop on exit from %s", name);
3783
3784 return (buf);
3785 }
3786
3787 /*ARGSUSED*/
3788 static int
3789 pt_sysexit_match(mdb_tgt_t *t, mdb_sespec_t *sep, mdb_tgt_status_t *tsp)
3790 {
3791 const lwpstatus_t *psp = &Pstatus(t->t_pshandle)->pr_lwp;
3792 int sysnum = (intptr_t)sep->se_data;
3793
3794 return (psp->pr_why == PR_SYSEXIT && psp->pr_what == sysnum);
3795 }
3796
3797 static const mdb_se_ops_t proc_sysexit_ops = {
3798 pt_sysexit_ctor, /* se_ctor */
3799 pt_sysexit_dtor, /* se_dtor */
3800 pt_sysexit_info, /* se_info */
3801 no_se_secmp, /* se_secmp */
3802 no_se_vecmp, /* se_vecmp */
3803 no_se_arm, /* se_arm */
3804 no_se_disarm, /* se_disarm */
3805 no_se_cont, /* se_cont */
3806 pt_sysexit_match /* se_match */
3807 };
3808
3809 static int
3810 pt_signal_ctor(mdb_tgt_t *t, mdb_sespec_t *sep, void *args)
3811 {
3812 struct ps_prochandle *P = t->t_pshandle;
3813
3814 if (P != NULL && Pstate(P) < PS_LOST) {
3815 sep->se_data = args; /* data is raw signal number */
3816 return (Psignal(P, (intptr_t)args, TRUE) < 0 ? -1 : 0);
3817 }
3818
3819 return (set_errno(EMDB_NOPROC));
3820 }
3821
3822 static void
3823 pt_signal_dtor(mdb_tgt_t *t, mdb_sespec_t *sep)
3824 {
3825 (void) Psignal(t->t_pshandle, (intptr_t)sep->se_data, FALSE);
3826 }
3827
3828 /*ARGSUSED*/
3829 static char *
3830 pt_signal_info(mdb_tgt_t *t, mdb_sespec_t *sep, mdb_vespec_t *vep,
3831 mdb_tgt_spec_desc_t *sp, char *buf, size_t nbytes)
3832 {
3833 char name[SIG2STR_MAX];
3834 int signum;
3835
3836 if (vep != NULL)
3837 signum = (intptr_t)vep->ve_args;
3838 else
3839 signum = (intptr_t)sep->se_data;
3840
3841 (void) proc_signame(signum, name, sizeof (name));
3842 (void) mdb_iob_snprintf(buf, nbytes, "stop on %s", name);
3843
3844 return (buf);
3845 }
3846
3847 /*ARGSUSED*/
3848 static int
3849 pt_signal_match(mdb_tgt_t *t, mdb_sespec_t *sep, mdb_tgt_status_t *tsp)
3850 {
3851 const lwpstatus_t *psp = &Pstatus(t->t_pshandle)->pr_lwp;
3852 int signum = (intptr_t)sep->se_data;
3853
3854 return (psp->pr_why == PR_SIGNALLED && psp->pr_what == signum);
3855 }
3856
3857 static const mdb_se_ops_t proc_signal_ops = {
3858 pt_signal_ctor, /* se_ctor */
3859 pt_signal_dtor, /* se_dtor */
3860 pt_signal_info, /* se_info */
3861 no_se_secmp, /* se_secmp */
3862 no_se_vecmp, /* se_vecmp */
3863 no_se_arm, /* se_arm */
3864 no_se_disarm, /* se_disarm */
3865 no_se_cont, /* se_cont */
3866 pt_signal_match /* se_match */
3867 };
3868
3869 static int
3870 pt_fault_ctor(mdb_tgt_t *t, mdb_sespec_t *sep, void *args)
3871 {
3872 struct ps_prochandle *P = t->t_pshandle;
3873
3874 if (P != NULL && Pstate(P) < PS_LOST) {
3875 sep->se_data = args; /* data is raw fault number */
3876 return (Pfault(P, (intptr_t)args, TRUE) < 0 ? -1 : 0);
3877 }
3878
3879 return (set_errno(EMDB_NOPROC));
3880 }
3881
3882 static void
3883 pt_fault_dtor(mdb_tgt_t *t, mdb_sespec_t *sep)
3884 {
3885 int fault = (intptr_t)sep->se_data;
3886
3887 if (fault != FLTBPT && fault != FLTTRACE && fault != FLTWATCH)
3888 (void) Pfault(t->t_pshandle, fault, FALSE);
3889 }
3890
3891 /*ARGSUSED*/
3892 static char *
3893 pt_fault_info(mdb_tgt_t *t, mdb_sespec_t *sep, mdb_vespec_t *vep,
3894 mdb_tgt_spec_desc_t *sp, char *buf, size_t nbytes)
3895 {
3896 char name[32];
3897 int fltnum;
3898
3899 if (vep != NULL)
3900 fltnum = (intptr_t)vep->ve_args;
3901 else
3902 fltnum = (intptr_t)sep->se_data;
3903
3904 (void) proc_fltname(fltnum, name, sizeof (name));
3905 (void) mdb_iob_snprintf(buf, nbytes, "stop on %s", name);
3906
3907 return (buf);
3908 }
3909
3910 /*ARGSUSED*/
3911 static int
3912 pt_fault_match(mdb_tgt_t *t, mdb_sespec_t *sep, mdb_tgt_status_t *tsp)
3913 {
3914 const lwpstatus_t *psp = &Pstatus(t->t_pshandle)->pr_lwp;
3915 int fltnum = (intptr_t)sep->se_data;
3916
3917 return (psp->pr_why == PR_FAULTED && psp->pr_what == fltnum);
3918 }
3919
3920 static const mdb_se_ops_t proc_fault_ops = {
3921 pt_fault_ctor, /* se_ctor */
3922 pt_fault_dtor, /* se_dtor */
3923 pt_fault_info, /* se_info */
3924 no_se_secmp, /* se_secmp */
3925 no_se_vecmp, /* se_vecmp */
3926 no_se_arm, /* se_arm */
3927 no_se_disarm, /* se_disarm */
3928 no_se_cont, /* se_cont */
3929 pt_fault_match /* se_match */
3930 };
3931
3932 /*
3933 * Callback for pt_ignore() dcmd above: for each VID, determine if it
3934 * corresponds to a vespec that traces the specified signal, and delete it.
3935 */
3936 /*ARGSUSED*/
3937 static int
3938 pt_ignore_sig(mdb_tgt_t *t, void *sig, int vid, void *data)
3939 {
3940 mdb_vespec_t *vep = mdb_tgt_vespec_lookup(t, vid);
3941
3942 if (vep->ve_se->se_ops == &proc_signal_ops && vep->ve_args == sig)
3943 (void) mdb_tgt_vespec_delete(t, vid);
3944
3945 return (0);
3946 }
3947
3948 static int
3949 pt_brkpt_ctor(mdb_tgt_t *t, mdb_sespec_t *sep, void *args)
3950 {
3951 pt_data_t *pt = t->t_data;
3952 pt_bparg_t *pta = args;
3953 pt_brkpt_t *ptb;
3954 GElf_Sym s;
3955
3956 if (t->t_pshandle == NULL || Pstate(t->t_pshandle) >= PS_LOST)
3957 return (set_errno(EMDB_NOPROC));
3958
3959 if (pta->pta_symbol != NULL) {
3960 if (!pt->p_rtld_finished &&
3961 strchr(pta->pta_symbol, '`') == NULL)
3962 return (set_errno(EMDB_NOSYM));
3963 if (mdb_tgt_lookup_by_scope(t, pta->pta_symbol, &s,
3964 NULL) == -1) {
3965 if (errno != EMDB_NOOBJ && !(errno == EMDB_NOSYM &&
3966 (!(mdb.m_flags & MDB_FL_BPTNOSYMSTOP) ||
3967 !pt->p_rtld_finished))) {
3968 warn("breakpoint %s activation failed",
3969 pta->pta_symbol);
3970 }
3971 return (-1); /* errno is set for us */
3972 }
3973
3974 pta->pta_addr = (uintptr_t)s.st_value;
3975 }
3976
3977 #ifdef __sparc
3978 if (pta->pta_addr & 3)
3979 return (set_errno(EMDB_BPALIGN));
3980 #endif
3981
3982 if (Paddr_to_map(t->t_pshandle, pta->pta_addr) == NULL)
3983 return (set_errno(EMDB_NOMAP));
3984
3985 ptb = mdb_alloc(sizeof (pt_brkpt_t), UM_SLEEP);
3986 ptb->ptb_addr = pta->pta_addr;
3987 ptb->ptb_instr = NULL;
3988 sep->se_data = ptb;
3989
3990 return (0);
3991 }
3992
3993 /*ARGSUSED*/
3994 static void
3995 pt_brkpt_dtor(mdb_tgt_t *t, mdb_sespec_t *sep)
3996 {
3997 mdb_free(sep->se_data, sizeof (pt_brkpt_t));
3998 }
3999
4000 /*ARGSUSED*/
4001 static char *
4002 pt_brkpt_info(mdb_tgt_t *t, mdb_sespec_t *sep, mdb_vespec_t *vep,
4003 mdb_tgt_spec_desc_t *sp, char *buf, size_t nbytes)
4004 {
4005 uintptr_t addr = NULL;
4006
4007 if (vep != NULL) {
4008 pt_bparg_t *pta = vep->ve_args;
4009
4010 if (pta->pta_symbol != NULL) {
4011 (void) mdb_iob_snprintf(buf, nbytes, "stop at %s",
4012 pta->pta_symbol);
4013 } else {
4014 (void) mdb_iob_snprintf(buf, nbytes, "stop at %a",
4015 pta->pta_addr);
4016 addr = pta->pta_addr;
4017 }
4018
4019 } else {
4020 addr = ((pt_brkpt_t *)sep->se_data)->ptb_addr;
4021 (void) mdb_iob_snprintf(buf, nbytes, "stop at %a", addr);
4022 }
4023
4024 sp->spec_base = addr;
4025 sp->spec_size = sizeof (instr_t);
4026
4027 return (buf);
4028 }
4029
4030 static int
4031 pt_brkpt_secmp(mdb_tgt_t *t, mdb_sespec_t *sep, void *args)
4032 {
4033 pt_brkpt_t *ptb = sep->se_data;
4034 pt_bparg_t *pta = args;
4035 GElf_Sym sym;
4036
4037 if (pta->pta_symbol != NULL) {
4038 return (mdb_tgt_lookup_by_scope(t, pta->pta_symbol,
4039 &sym, NULL) == 0 && sym.st_value == ptb->ptb_addr);
4040 }
4041
4042 return (pta->pta_addr == ptb->ptb_addr);
4043 }
4044
4045 /*ARGSUSED*/
4046 static int
4047 pt_brkpt_vecmp(mdb_tgt_t *t, mdb_vespec_t *vep, void *args)
4048 {
4049 pt_bparg_t *pta1 = vep->ve_args;
4050 pt_bparg_t *pta2 = args;
4051
4052 if (pta1->pta_symbol != NULL && pta2->pta_symbol != NULL)
4053 return (strcmp(pta1->pta_symbol, pta2->pta_symbol) == 0);
4054
4055 if (pta1->pta_symbol == NULL && pta2->pta_symbol == NULL)
4056 return (pta1->pta_addr == pta2->pta_addr);
4057
4058 return (0); /* fail if one is symbolic, other is an explicit address */
4059 }
4060
4061 static int
4062 pt_brkpt_arm(mdb_tgt_t *t, mdb_sespec_t *sep)
4063 {
4064 pt_brkpt_t *ptb = sep->se_data;
4065 return (Psetbkpt(t->t_pshandle, ptb->ptb_addr, &ptb->ptb_instr));
4066 }
4067
4068 /*
4069 * In order to disarm a breakpoint, we replace the trap instruction at ptb_addr
4070 * with the saved instruction. However, if we have stopped after a successful
4071 * exec(2), we do not want to restore ptb_instr because the address space has
4072 * now been replaced with the text of a different executable, and so restoring
4073 * the saved instruction would be incorrect. The exec itself has effectively
4074 * removed all breakpoint trap instructions for us, so we can just return.
4075 */
4076 static int
4077 pt_brkpt_disarm(mdb_tgt_t *t, mdb_sespec_t *sep)
4078 {
4079 const lwpstatus_t *psp = &Pstatus(t->t_pshandle)->pr_lwp;
4080 pt_brkpt_t *ptb = sep->se_data;
4081
4082 if (psp->pr_why == PR_SYSEXIT && psp->pr_errno == 0 &&
4083 psp->pr_what == SYS_execve)
4084 return (0); /* do not restore saved instruction */
4085
4086 return (Pdelbkpt(t->t_pshandle, ptb->ptb_addr, ptb->ptb_instr));
4087 }
4088
4089 /*
4090 * Determine whether the specified sespec is an armed watchpoint that overlaps
4091 * with the given breakpoint and has the given flags set. We use this to find
4092 * conflicts with breakpoints, below.
4093 */
4094 static int
4095 pt_wp_overlap(mdb_sespec_t *sep, pt_brkpt_t *ptb, int flags)
4096 {
4097 const prwatch_t *wp = sep->se_data;
4098
4099 return (sep->se_state == MDB_TGT_SPEC_ARMED &&
4100 sep->se_ops == &proc_wapt_ops && (wp->pr_wflags & flags) &&
4101 ptb->ptb_addr - wp->pr_vaddr < wp->pr_size);
4102 }
4103
4104 /*
4105 * We step over breakpoints using Pxecbkpt() in libproc. If a conflicting
4106 * watchpoint is present, we must temporarily remove it before stepping over
4107 * the breakpoint so we do not immediately re-trigger the watchpoint. We know
4108 * the watchpoint has already triggered on our trap instruction as part of
4109 * fetching it. Before we return, we must re-install any disabled watchpoints.
4110 */
4111 static int
4112 pt_brkpt_cont(mdb_tgt_t *t, mdb_sespec_t *sep, mdb_tgt_status_t *tsp)
4113 {
4114 pt_brkpt_t *ptb = sep->se_data;
4115 int status = -1;
4116 int error;
4117 const lwpstatus_t *psp = &Pstatus(t->t_pshandle)->pr_lwp;
4118
4119 /*
4120 * If the PC no longer matches our original address, then the user has
4121 * changed it while we have been stopped. In this case, it no longer
4122 * makes any sense to continue over this breakpoint. We return as if we
4123 * continued normally.
4124 */
4125 if ((uintptr_t)psp->pr_info.si_addr != psp->pr_reg[R_PC])
4126 return (pt_status(t, tsp));
4127
4128 for (sep = mdb_list_next(&t->t_active); sep; sep = mdb_list_next(sep)) {
4129 if (pt_wp_overlap(sep, ptb, WA_EXEC))
4130 (void) Pdelwapt(t->t_pshandle, sep->se_data);
4131 }
4132
4133 if (Pxecbkpt(t->t_pshandle, ptb->ptb_instr) == 0 &&
4134 Pdelbkpt(t->t_pshandle, ptb->ptb_addr, ptb->ptb_instr) == 0)
4135 status = pt_status(t, tsp);
4136
4137 error = errno; /* save errno from Pxecbkpt, Pdelbkpt, or pt_status */
4138
4139 for (sep = mdb_list_next(&t->t_active); sep; sep = mdb_list_next(sep)) {
4140 if (pt_wp_overlap(sep, ptb, WA_EXEC) &&
4141 Psetwapt(t->t_pshandle, sep->se_data) == -1) {
4142 sep->se_state = MDB_TGT_SPEC_ERROR;
4143 sep->se_errno = errno;
4144 }
4145 }
4146
4147 (void) set_errno(error);
4148 return (status);
4149 }
4150
4151 /*ARGSUSED*/
4152 static int
4153 pt_brkpt_match(mdb_tgt_t *t, mdb_sespec_t *sep, mdb_tgt_status_t *tsp)
4154 {
4155 const lwpstatus_t *psp = &Pstatus(t->t_pshandle)->pr_lwp;
4156 pt_brkpt_t *ptb = sep->se_data;
4157
4158 return (psp->pr_why == PR_FAULTED && psp->pr_what == FLTBPT &&
4159 psp->pr_reg[R_PC] == ptb->ptb_addr);
4160 }
4161
4162 static const mdb_se_ops_t proc_brkpt_ops = {
4163 pt_brkpt_ctor, /* se_ctor */
4164 pt_brkpt_dtor, /* se_dtor */
4165 pt_brkpt_info, /* se_info */
4166 pt_brkpt_secmp, /* se_secmp */
4167 pt_brkpt_vecmp, /* se_vecmp */
4168 pt_brkpt_arm, /* se_arm */
4169 pt_brkpt_disarm, /* se_disarm */
4170 pt_brkpt_cont, /* se_cont */
4171 pt_brkpt_match /* se_match */
4172 };
4173
4174 static int
4175 pt_wapt_ctor(mdb_tgt_t *t, mdb_sespec_t *sep, void *args)
4176 {
4177 if (t->t_pshandle == NULL || Pstate(t->t_pshandle) >= PS_LOST)
4178 return (set_errno(EMDB_NOPROC));
4179
4180 sep->se_data = mdb_alloc(sizeof (prwatch_t), UM_SLEEP);
4181 bcopy(args, sep->se_data, sizeof (prwatch_t));
4182 return (0);
4183 }
4184
4185 /*ARGSUSED*/
4186 static void
4187 pt_wapt_dtor(mdb_tgt_t *t, mdb_sespec_t *sep)
4188 {
4189 mdb_free(sep->se_data, sizeof (prwatch_t));
4190 }
4191
4192 /*ARGSUSED*/
4193 static char *
4194 pt_wapt_info(mdb_tgt_t *t, mdb_sespec_t *sep, mdb_vespec_t *vep,
4195 mdb_tgt_spec_desc_t *sp, char *buf, size_t nbytes)
4196 {
4197 prwatch_t *wp = vep != NULL ? vep->ve_args : sep->se_data;
4198 char desc[24];
4199
4200 ASSERT(wp->pr_wflags != 0);
4201 desc[0] = '\0';
4202
4203 switch (wp->pr_wflags) {
4204 case WA_READ:
4205 (void) strcat(desc, "/read");
4206 break;
4207 case WA_WRITE:
4208 (void) strcat(desc, "/write");
4209 break;
4210 case WA_EXEC:
4211 (void) strcat(desc, "/exec");
4212 break;
4213 default:
4214 if (wp->pr_wflags & WA_READ)
4215 (void) strcat(desc, "/r");
4216 if (wp->pr_wflags & WA_WRITE)
4217 (void) strcat(desc, "/w");
4218 if (wp->pr_wflags & WA_EXEC)
4219 (void) strcat(desc, "/x");
4220 }
4221
4222 (void) mdb_iob_snprintf(buf, nbytes, "stop on %s of [%la, %la)",
4223 desc + 1, wp->pr_vaddr, wp->pr_vaddr + wp->pr_size);
4224
4225 sp->spec_base = wp->pr_vaddr;
4226 sp->spec_size = wp->pr_size;
4227
4228 return (buf);
4229 }
4230
4231 /*ARGSUSED*/
4232 static int
4233 pt_wapt_secmp(mdb_tgt_t *t, mdb_sespec_t *sep, void *args)
4234 {
4235 prwatch_t *wp1 = sep->se_data;
4236 prwatch_t *wp2 = args;
4237
4238 return (wp1->pr_vaddr == wp2->pr_vaddr &&
4239 wp1->pr_size == wp2->pr_size && wp1->pr_wflags == wp2->pr_wflags);
4240 }
4241
4242 /*ARGSUSED*/
4243 static int
4244 pt_wapt_vecmp(mdb_tgt_t *t, mdb_vespec_t *vep, void *args)
4245 {
4246 prwatch_t *wp1 = vep->ve_args;
4247 prwatch_t *wp2 = args;
4248
4249 return (wp1->pr_vaddr == wp2->pr_vaddr &&
4250 wp1->pr_size == wp2->pr_size && wp1->pr_wflags == wp2->pr_wflags);
4251 }
4252
4253 static int
4254 pt_wapt_arm(mdb_tgt_t *t, mdb_sespec_t *sep)
4255 {
4256 return (Psetwapt(t->t_pshandle, sep->se_data));
4257 }
4258
4259 static int
4260 pt_wapt_disarm(mdb_tgt_t *t, mdb_sespec_t *sep)
4261 {
4262 return (Pdelwapt(t->t_pshandle, sep->se_data));
4263 }
4264
4265 /*
4266 * Determine whether the specified sespec is an armed breakpoint at the
4267 * given %pc. We use this to find conflicts with watchpoints below.
4268 */
4269 static int
4270 pt_bp_overlap(mdb_sespec_t *sep, uintptr_t pc)
4271 {
4272 pt_brkpt_t *ptb = sep->se_data;
4273
4274 return (sep->se_state == MDB_TGT_SPEC_ARMED &&
4275 sep->se_ops == &proc_brkpt_ops && ptb->ptb_addr == pc);
4276 }
4277
4278 /*
4279 * We step over watchpoints using Pxecwapt() in libproc. If a conflicting
4280 * breakpoint is present, we must temporarily disarm it before stepping
4281 * over the watchpoint so we do not immediately re-trigger the breakpoint.
4282 * This is similar to the case handled in pt_brkpt_cont(), above.
4283 */
4284 static int
4285 pt_wapt_cont(mdb_tgt_t *t, mdb_sespec_t *sep, mdb_tgt_status_t *tsp)
4286 {
4287 const lwpstatus_t *psp = &Pstatus(t->t_pshandle)->pr_lwp;
4288 mdb_sespec_t *bep = NULL;
4289 int status = -1;
4290 int error;
4291
4292 /*
4293 * If the PC no longer matches our original address, then the user has
4294 * changed it while we have been stopped. In this case, it no longer
4295 * makes any sense to continue over this instruction. We return as if
4296 * we continued normally.
4297 */
4298 if ((uintptr_t)psp->pr_info.si_pc != psp->pr_reg[R_PC])
4299 return (pt_status(t, tsp));
4300
4301 if (psp->pr_info.si_code != TRAP_XWATCH) {
4302 for (bep = mdb_list_next(&t->t_active); bep != NULL;
4303 bep = mdb_list_next(bep)) {
4304 if (pt_bp_overlap(bep, psp->pr_reg[R_PC])) {
4305 (void) bep->se_ops->se_disarm(t, bep);
4306 bep->se_state = MDB_TGT_SPEC_ACTIVE;
4307 break;
4308 }
4309 }
4310 }
4311
4312 if (Pxecwapt(t->t_pshandle, sep->se_data) == 0)
4313 status = pt_status(t, tsp);
4314
4315 error = errno; /* save errno from Pxecwapt or pt_status */
4316
4317 if (bep != NULL)
4318 mdb_tgt_sespec_arm_one(t, bep);
4319
4320 (void) set_errno(error);
4321 return (status);
4322 }
4323
4324 /*ARGSUSED*/
4325 static int
4326 pt_wapt_match(mdb_tgt_t *t, mdb_sespec_t *sep, mdb_tgt_status_t *tsp)
4327 {
4328 const lwpstatus_t *psp = &Pstatus(t->t_pshandle)->pr_lwp;
4329 prwatch_t *wp = sep->se_data;
4330
4331 return (psp->pr_why == PR_FAULTED && psp->pr_what == FLTWATCH &&
4332 (uintptr_t)psp->pr_info.si_addr - wp->pr_vaddr < wp->pr_size);
4333 }
4334
4335 static const mdb_se_ops_t proc_wapt_ops = {
4336 pt_wapt_ctor, /* se_ctor */
4337 pt_wapt_dtor, /* se_dtor */
4338 pt_wapt_info, /* se_info */
4339 pt_wapt_secmp, /* se_secmp */
4340 pt_wapt_vecmp, /* se_vecmp */
4341 pt_wapt_arm, /* se_arm */
4342 pt_wapt_disarm, /* se_disarm */
4343 pt_wapt_cont, /* se_cont */
4344 pt_wapt_match /* se_match */
4345 };
4346
4347 static void
4348 pt_bparg_dtor(mdb_vespec_t *vep)
4349 {
4350 pt_bparg_t *pta = vep->ve_args;
4351
4352 if (pta->pta_symbol != NULL)
4353 strfree(pta->pta_symbol);
4354
4355 mdb_free(pta, sizeof (pt_bparg_t));
4356 }
4357
4358 static int
4359 pt_add_vbrkpt(mdb_tgt_t *t, uintptr_t addr,
4360 int spec_flags, mdb_tgt_se_f *func, void *data)
4361 {
4362 pt_bparg_t *pta = mdb_alloc(sizeof (pt_bparg_t), UM_SLEEP);
4363
4364 pta->pta_symbol = NULL;
4365 pta->pta_addr = addr;
4366
4367 return (mdb_tgt_vespec_insert(t, &proc_brkpt_ops, spec_flags,
4368 func, data, pta, pt_bparg_dtor));
4369 }
4370
4371 static int
4372 pt_add_sbrkpt(mdb_tgt_t *t, const char *sym,
4373 int spec_flags, mdb_tgt_se_f *func, void *data)
4374 {
4375 pt_bparg_t *pta;
4376
4377 if (sym[0] == '`') {
4378 (void) set_errno(EMDB_NOOBJ);
4379 return (0);
4380 }
4381
4382 if (sym[strlen(sym) - 1] == '`') {
4383 (void) set_errno(EMDB_NOSYM);
4384 return (0);
4385 }
4386
4387 pta = mdb_alloc(sizeof (pt_bparg_t), UM_SLEEP);
4388 pta->pta_symbol = strdup(sym);
4389 pta->pta_addr = NULL;
4390
4391 return (mdb_tgt_vespec_insert(t, &proc_brkpt_ops, spec_flags,
4392 func, data, pta, pt_bparg_dtor));
4393 }
4394
4395 static int
4396 pt_wparg_overlap(const prwatch_t *wp1, const prwatch_t *wp2)
4397 {
4398 if (wp2->pr_vaddr + wp2->pr_size <= wp1->pr_vaddr)
4399 return (0); /* no range overlap */
4400
4401 if (wp1->pr_vaddr + wp1->pr_size <= wp2->pr_vaddr)
4402 return (0); /* no range overlap */
4403
4404 return (wp1->pr_vaddr != wp2->pr_vaddr ||
4405 wp1->pr_size != wp2->pr_size || wp1->pr_wflags != wp2->pr_wflags);
4406 }
4407
4408 static void
4409 pt_wparg_dtor(mdb_vespec_t *vep)
4410 {
4411 mdb_free(vep->ve_args, sizeof (prwatch_t));
4412 }
4413
4414 static int
4415 pt_add_vwapt(mdb_tgt_t *t, uintptr_t addr, size_t len, uint_t wflags,
4416 int spec_flags, mdb_tgt_se_f *func, void *data)
4417 {
4418 prwatch_t *wp = mdb_alloc(sizeof (prwatch_t), UM_SLEEP);
4419 mdb_sespec_t *sep;
4420
4421 wp->pr_vaddr = addr;
4422 wp->pr_size = len;
4423 wp->pr_wflags = 0;
4424
4425 if (wflags & MDB_TGT_WA_R)
4426 wp->pr_wflags |= WA_READ;
4427 if (wflags & MDB_TGT_WA_W)
4428 wp->pr_wflags |= WA_WRITE;
4429 if (wflags & MDB_TGT_WA_X)
4430 wp->pr_wflags |= WA_EXEC;
4431
4432 for (sep = mdb_list_next(&t->t_active); sep; sep = mdb_list_next(sep)) {
4433 if (sep->se_ops == &proc_wapt_ops &&
4434 mdb_list_next(&sep->se_velist) != NULL &&
4435 pt_wparg_overlap(wp, sep->se_data))
4436 goto dup;
4437 }
4438
4439 for (sep = mdb_list_next(&t->t_idle); sep; sep = mdb_list_next(sep)) {
4440 if (sep->se_ops == &proc_wapt_ops && pt_wparg_overlap(wp,
4441 ((mdb_vespec_t *)mdb_list_next(&sep->se_velist))->ve_args))
4442 goto dup;
4443 }
4444
4445 return (mdb_tgt_vespec_insert(t, &proc_wapt_ops, spec_flags,
4446 func, data, wp, pt_wparg_dtor));
4447
4448 dup:
4449 mdb_free(wp, sizeof (prwatch_t));
4450 (void) set_errno(EMDB_WPDUP);
4451 return (0);
4452 }
4453
4454 static int
4455 pt_add_sysenter(mdb_tgt_t *t, int sysnum,
4456 int spec_flags, mdb_tgt_se_f *func, void *data)
4457 {
4458 if (sysnum <= 0 || sysnum > PRMAXSYS) {
4459 (void) set_errno(EMDB_BADSYSNUM);
4460 return (0);
4461 }
4462
4463 return (mdb_tgt_vespec_insert(t, &proc_sysenter_ops, spec_flags,
4464 func, data, (void *)(uintptr_t)sysnum, no_ve_dtor));
4465 }
4466
4467 static int
4468 pt_add_sysexit(mdb_tgt_t *t, int sysnum,
4469 int spec_flags, mdb_tgt_se_f *func, void *data)
4470 {
4471 if (sysnum <= 0 || sysnum > PRMAXSYS) {
4472 (void) set_errno(EMDB_BADSYSNUM);
4473 return (0);
4474 }
4475
4476 return (mdb_tgt_vespec_insert(t, &proc_sysexit_ops, spec_flags,
4477 func, data, (void *)(uintptr_t)sysnum, no_ve_dtor));
4478 }
4479
4480 static int
4481 pt_add_signal(mdb_tgt_t *t, int signum,
4482 int spec_flags, mdb_tgt_se_f *func, void *data)
4483 {
4484 pt_data_t *pt = t->t_data;
4485
4486 if (signum <= 0 || signum > pt->p_maxsig) {
4487 (void) set_errno(EMDB_BADSIGNUM);
4488 return (0);
4489 }
4490
4491 return (mdb_tgt_vespec_insert(t, &proc_signal_ops, spec_flags,
4492 func, data, (void *)(uintptr_t)signum, no_ve_dtor));
4493 }
4494
4495 static int
4496 pt_add_fault(mdb_tgt_t *t, int fltnum,
4497 int spec_flags, mdb_tgt_se_f *func, void *data)
4498 {
4499 if (fltnum <= 0 || fltnum > PRMAXFAULT) {
4500 (void) set_errno(EMDB_BADFLTNUM);
4501 return (0);
4502 }
4503
4504 return (mdb_tgt_vespec_insert(t, &proc_fault_ops, spec_flags,
4505 func, data, (void *)(uintptr_t)fltnum, no_ve_dtor));
4506 }
4507
4508 static int
4509 pt_getareg(mdb_tgt_t *t, mdb_tgt_tid_t tid,
4510 const char *rname, mdb_tgt_reg_t *rp)
4511 {
4512 pt_data_t *pt = t->t_data;
4513 prgregset_t grs;
4514 mdb_var_t *v;
4515
4516 if (t->t_pshandle == NULL)
4517 return (set_errno(EMDB_NOPROC));
4518
4519 if ((v = mdb_nv_lookup(&pt->p_regs, rname)) != NULL) {
4520 uintmax_t rd_nval = mdb_nv_get_value(v);
4521 ushort_t rd_num = MDB_TGT_R_NUM(rd_nval);
4522 ushort_t rd_flags = MDB_TGT_R_FLAGS(rd_nval);
4523
4524 if (!MDB_TGT_R_IS_FP(rd_flags)) {
4525 mdb_tgt_reg_t r = 0;
4526
4527 #if defined(__sparc) && defined(_ILP32)
4528 /*
4529 * If we are debugging on 32-bit SPARC, the globals and
4530 * outs can have 32 upper bits hiding in the xregs.
4531 */
4532 /* gcc doesn't like >= R_G0 because R_G0 == 0 */
4533 int is_g = (rd_num == R_G0 ||
4534 rd_num >= R_G1 && rd_num <= R_G7);
4535 int is_o = (rd_num >= R_O0 && rd_num <= R_O7);
4536 prxregset_t xrs;
4537
4538 if (is_g && PTL_GETXREGS(t, tid, &xrs) == 0 &&
4539 xrs.pr_type == XR_TYPE_V8P) {
4540 r |= (uint64_t)xrs.pr_un.pr_v8p.pr_xg[
4541 rd_num - R_G0 + XR_G0] << 32;
4542 }
4543
4544 if (is_o && PTL_GETXREGS(t, tid, &xrs) == 0 &&
4545 xrs.pr_type == XR_TYPE_V8P) {
4546 r |= (uint64_t)xrs.pr_un.pr_v8p.pr_xo[
4547 rd_num - R_O0 + XR_O0] << 32;
4548 }
4549 #endif /* __sparc && _ILP32 */
4550
4551 /*
4552 * Avoid sign-extension by casting: recall that procfs
4553 * defines prgreg_t as a long or int and our native
4554 * register handling uses uint64_t's.
4555 */
4556 if (PTL_GETREGS(t, tid, grs) == 0) {
4557 *rp = r | (ulong_t)grs[rd_num];
4558 if (rd_flags & MDB_TGT_R_32)
4559 *rp &= 0xffffffffULL;
4560 else if (rd_flags & MDB_TGT_R_16)
4561 *rp &= 0xffffULL;
4562 else if (rd_flags & MDB_TGT_R_8H)
4563 *rp = (*rp & 0xff00ULL) >> 8;
4564 else if (rd_flags & MDB_TGT_R_8L)
4565 *rp &= 0xffULL;
4566 return (0);
4567 }
4568 return (-1);
4569 } else
4570 return (pt_getfpreg(t, tid, rd_num, rd_flags, rp));
4571 }
4572
4573 return (set_errno(EMDB_BADREG));
4574 }
4575
4576 static int
4577 pt_putareg(mdb_tgt_t *t, mdb_tgt_tid_t tid, const char *rname, mdb_tgt_reg_t r)
4578 {
4579 pt_data_t *pt = t->t_data;
4580 prgregset_t grs;
4581 mdb_var_t *v;
4582
4583 if (t->t_pshandle == NULL)
4584 return (set_errno(EMDB_NOPROC));
4585
4586 if ((v = mdb_nv_lookup(&pt->p_regs, rname)) != NULL) {
4587 uintmax_t rd_nval = mdb_nv_get_value(v);
4588 ushort_t rd_num = MDB_TGT_R_NUM(rd_nval);
4589 ushort_t rd_flags = MDB_TGT_R_FLAGS(rd_nval);
4590
4591 if (!MDB_TGT_R_IS_FP(rd_flags)) {
4592
4593 if (rd_flags & MDB_TGT_R_32)
4594 r &= 0xffffffffULL;
4595 else if (rd_flags & MDB_TGT_R_16)
4596 r &= 0xffffULL;
4597 else if (rd_flags & MDB_TGT_R_8H)
4598 r = (r & 0xffULL) << 8;
4599 else if (rd_flags & MDB_TGT_R_8L)
4600 r &= 0xffULL;
4601
4602 #if defined(__sparc) && defined(_ILP32)
4603 /*
4604 * If we are debugging on 32-bit SPARC, the globals and
4605 * outs can have 32 upper bits stored in the xregs.
4606 */
4607 int is_g = (rd_num == R_G0 ||
4608 rd_num >= R_G1 && rd_num <= R_G7);
4609 int is_o = (rd_num >= R_O0 && rd_num <= R_O7);
4610 prxregset_t xrs;
4611
4612 if ((is_g || is_o) && PTL_GETXREGS(t, tid, &xrs) == 0 &&
4613 xrs.pr_type == XR_TYPE_V8P) {
4614 if (is_g) {
4615 xrs.pr_un.pr_v8p.pr_xg[rd_num -
4616 R_G0 + XR_G0] = (uint32_t)(r >> 32);
4617 } else if (is_o) {
4618 xrs.pr_un.pr_v8p.pr_xo[rd_num -
4619 R_O0 + XR_O0] = (uint32_t)(r >> 32);
4620 }
4621
4622 if (PTL_SETXREGS(t, tid, &xrs) == -1)
4623 return (-1);
4624 }
4625 #endif /* __sparc && _ILP32 */
4626
4627 if (PTL_GETREGS(t, tid, grs) == 0) {
4628 grs[rd_num] = (prgreg_t)r;
4629 return (PTL_SETREGS(t, tid, grs));
4630 }
4631 return (-1);
4632 } else
4633 return (pt_putfpreg(t, tid, rd_num, rd_flags, r));
4634 }
4635
4636 return (set_errno(EMDB_BADREG));
4637 }
4638
4639 static int
4640 pt_stack_call(pt_stkarg_t *psp, const prgregset_t grs, uint_t argc, long *argv)
4641 {
4642 psp->pstk_gotpc |= (grs[R_PC] != 0);
4643
4644 if (!psp->pstk_gotpc)
4645 return (0); /* skip initial zeroed frames */
4646
4647 return (psp->pstk_func(psp->pstk_private, grs[R_PC],
4648 argc, argv, (const struct mdb_tgt_gregset *)grs));
4649 }
4650
4651 static int
4652 pt_stack_iter(mdb_tgt_t *t, const mdb_tgt_gregset_t *gsp,
4653 mdb_tgt_stack_f *func, void *arg)
4654 {
4655 if (t->t_pshandle != NULL) {
4656 pt_stkarg_t pstk;
4657
4658 pstk.pstk_func = func;
4659 pstk.pstk_private = arg;
4660 pstk.pstk_gotpc = FALSE;
4661
4662 (void) Pstack_iter(t->t_pshandle, gsp->gregs,
4663 (proc_stack_f *)pt_stack_call, &pstk);
4664
4665 return (0);
4666 }
4667
4668 return (set_errno(EMDB_NOPROC));
4669 }
4670
4671 static int
4672 pt_auxv(mdb_tgt_t *t, const auxv_t **auxvp)
4673 {
4674 if (t->t_pshandle != NULL) {
4675 *auxvp = Pgetauxvec(t->t_pshandle);
4676 return (0);
4677 }
4678
4679 return (set_errno(EMDB_NOPROC));
4680 }
4681
4682
4683 static const mdb_tgt_ops_t proc_ops = {
4684 pt_setflags, /* t_setflags */
4685 (int (*)()) mdb_tgt_notsup, /* t_setcontext */
4686 pt_activate, /* t_activate */
4687 pt_deactivate, /* t_deactivate */
4688 pt_periodic, /* t_periodic */
4689 pt_destroy, /* t_destroy */
4690 pt_name, /* t_name */
4691 (const char *(*)()) mdb_conf_isa, /* t_isa */
4692 pt_platform, /* t_platform */
4693 pt_uname, /* t_uname */
4694 pt_dmodel, /* t_dmodel */
4695 (ssize_t (*)()) mdb_tgt_notsup, /* t_aread */
4696 (ssize_t (*)()) mdb_tgt_notsup, /* t_awrite */
4697 pt_vread, /* t_vread */
4698 pt_vwrite, /* t_vwrite */
4699 (ssize_t (*)()) mdb_tgt_notsup, /* t_pread */
4700 (ssize_t (*)()) mdb_tgt_notsup, /* t_pwrite */
4701 pt_fread, /* t_fread */
4702 pt_fwrite, /* t_fwrite */
4703 (ssize_t (*)()) mdb_tgt_notsup, /* t_ioread */
4704 (ssize_t (*)()) mdb_tgt_notsup, /* t_iowrite */
4705 (int (*)()) mdb_tgt_notsup, /* t_vtop */
4706 pt_lookup_by_name, /* t_lookup_by_name */
4707 pt_lookup_by_addr, /* t_lookup_by_addr */
4708 pt_symbol_iter, /* t_symbol_iter */
4709 pt_mapping_iter, /* t_mapping_iter */
4710 pt_object_iter, /* t_object_iter */
4711 pt_addr_to_map, /* t_addr_to_map */
4712 pt_name_to_map, /* t_name_to_map */
4713 pt_addr_to_ctf, /* t_addr_to_ctf */
4714 pt_name_to_ctf, /* t_name_to_ctf */
4715 pt_status, /* t_status */
4716 pt_run, /* t_run */
4717 pt_step, /* t_step */
4718 pt_step_out, /* t_step_out */
4719 pt_next, /* t_next */
4720 pt_continue, /* t_cont */
4721 pt_signal, /* t_signal */
4722 pt_add_vbrkpt, /* t_add_vbrkpt */
4723 pt_add_sbrkpt, /* t_add_sbrkpt */
4724 (int (*)()) mdb_tgt_null, /* t_add_pwapt */
4725 pt_add_vwapt, /* t_add_vwapt */
4726 (int (*)()) mdb_tgt_null, /* t_add_iowapt */
4727 pt_add_sysenter, /* t_add_sysenter */
4728 pt_add_sysexit, /* t_add_sysexit */
4729 pt_add_signal, /* t_add_signal */
4730 pt_add_fault, /* t_add_fault */
4731 pt_getareg, /* t_getareg */
4732 pt_putareg, /* t_putareg */
4733 pt_stack_iter, /* t_stack_iter */
4734 pt_auxv /* t_auxv */
4735 };
4736
4737 /*
4738 * Utility function for converting libproc errno values to mdb error values
4739 * for the ptl calls below. Currently, we only need to convert ENOENT to
4740 * EMDB_NOTHREAD to produce a more useful error message for the user.
4741 */
4742 static int
4743 ptl_err(int error)
4744 {
4745 if (error != 0 && errno == ENOENT)
4746 return (set_errno(EMDB_NOTHREAD));
4747
4748 return (error);
4749 }
4750
4751 /*ARGSUSED*/
4752 static mdb_tgt_tid_t
4753 pt_lwp_tid(mdb_tgt_t *t, void *tap)
4754 {
4755 if (t->t_pshandle != NULL)
4756 return (Pstatus(t->t_pshandle)->pr_lwp.pr_lwpid);
4757
4758 return (set_errno(EMDB_NOPROC));
4759 }
4760
4761 static int
4762 pt_lwp_add(mdb_addrvec_t *ap, const lwpstatus_t *psp)
4763 {
4764 mdb_addrvec_unshift(ap, psp->pr_lwpid);
4765 return (0);
4766 }
4767
4768 /*ARGSUSED*/
4769 static int
4770 pt_lwp_iter(mdb_tgt_t *t, void *tap, mdb_addrvec_t *ap)
4771 {
4772 if (t->t_pshandle != NULL)
4773 return (Plwp_iter(t->t_pshandle, (proc_lwp_f *)pt_lwp_add, ap));
4774
4775 return (set_errno(EMDB_NOPROC));
4776 }
4777
4778 /*ARGSUSED*/
4779 static int
4780 pt_lwp_getregs(mdb_tgt_t *t, void *tap, mdb_tgt_tid_t tid, prgregset_t gregs)
4781 {
4782 if (t->t_pshandle != NULL) {
4783 return (ptl_err(Plwp_getregs(t->t_pshandle,
4784 (lwpid_t)tid, gregs)));
4785 }
4786 return (set_errno(EMDB_NOPROC));
4787 }
4788
4789 /*ARGSUSED*/
4790 static int
4791 pt_lwp_setregs(mdb_tgt_t *t, void *tap, mdb_tgt_tid_t tid, prgregset_t gregs)
4792 {
4793 if (t->t_pshandle != NULL) {
4794 return (ptl_err(Plwp_setregs(t->t_pshandle,
4795 (lwpid_t)tid, gregs)));
4796 }
4797 return (set_errno(EMDB_NOPROC));
4798 }
4799
4800 #ifdef __sparc
4801
4802 /*ARGSUSED*/
4803 static int
4804 pt_lwp_getxregs(mdb_tgt_t *t, void *tap, mdb_tgt_tid_t tid, prxregset_t *xregs)
4805 {
4806 if (t->t_pshandle != NULL) {
4807 return (ptl_err(Plwp_getxregs(t->t_pshandle,
4808 (lwpid_t)tid, xregs)));
4809 }
4810 return (set_errno(EMDB_NOPROC));
4811 }
4812
4813 /*ARGSUSED*/
4814 static int
4815 pt_lwp_setxregs(mdb_tgt_t *t, void *tap, mdb_tgt_tid_t tid,
4816 const prxregset_t *xregs)
4817 {
4818 if (t->t_pshandle != NULL) {
4819 return (ptl_err(Plwp_setxregs(t->t_pshandle,
4820 (lwpid_t)tid, xregs)));
4821 }
4822 return (set_errno(EMDB_NOPROC));
4823 }
4824
4825 #endif /* __sparc */
4826
4827 /*ARGSUSED*/
4828 static int
4829 pt_lwp_getfpregs(mdb_tgt_t *t, void *tap, mdb_tgt_tid_t tid,
4830 prfpregset_t *fpregs)
4831 {
4832 if (t->t_pshandle != NULL) {
4833 return (ptl_err(Plwp_getfpregs(t->t_pshandle,
4834 (lwpid_t)tid, fpregs)));
4835 }
4836 return (set_errno(EMDB_NOPROC));
4837 }
4838
4839 /*ARGSUSED*/
4840 static int
4841 pt_lwp_setfpregs(mdb_tgt_t *t, void *tap, mdb_tgt_tid_t tid,
4842 const prfpregset_t *fpregs)
4843 {
4844 if (t->t_pshandle != NULL) {
4845 return (ptl_err(Plwp_setfpregs(t->t_pshandle,
4846 (lwpid_t)tid, fpregs)));
4847 }
4848 return (set_errno(EMDB_NOPROC));
4849 }
4850
4851 static const pt_ptl_ops_t proc_lwp_ops = {
4852 (int (*)()) mdb_tgt_nop,
4853 (void (*)()) mdb_tgt_nop,
4854 pt_lwp_tid,
4855 pt_lwp_iter,
4856 pt_lwp_getregs,
4857 pt_lwp_setregs,
4858 #ifdef __sparc
4859 pt_lwp_getxregs,
4860 pt_lwp_setxregs,
4861 #endif
4862 pt_lwp_getfpregs,
4863 pt_lwp_setfpregs
4864 };
4865
4866 static int
4867 pt_tdb_ctor(mdb_tgt_t *t)
4868 {
4869 pt_data_t *pt = t->t_data;
4870 td_thragent_t *tap;
4871 td_err_e err;
4872
4873 if ((err = pt->p_tdb_ops->td_ta_new(t->t_pshandle, &tap)) != TD_OK)
4874 return (set_errno(tdb_to_errno(err)));
4875
4876 pt->p_ptl_hdl = tap;
4877 return (0);
4878 }
4879
4880 static void
4881 pt_tdb_dtor(mdb_tgt_t *t, void *tap)
4882 {
4883 pt_data_t *pt = t->t_data;
4884
4885 ASSERT(tap == pt->p_ptl_hdl);
4886 (void) pt->p_tdb_ops->td_ta_delete(tap);
4887 pt->p_ptl_hdl = NULL;
4888 }
4889
4890 static mdb_tgt_tid_t
4891 pt_tdb_tid(mdb_tgt_t *t, void *tap)
4892 {
4893 pt_data_t *pt = t->t_data;
4894
4895 td_thrhandle_t th;
4896 td_thrinfo_t ti;
4897 td_err_e err;
4898
4899 if (t->t_pshandle == NULL)
4900 return (set_errno(EMDB_NOPROC));
4901
4902 if ((err = pt->p_tdb_ops->td_ta_map_lwp2thr(tap,
4903 Pstatus(t->t_pshandle)->pr_lwp.pr_lwpid, &th)) != TD_OK)
4904 return (set_errno(tdb_to_errno(err)));
4905
4906 if ((err = pt->p_tdb_ops->td_thr_get_info(&th, &ti)) != TD_OK)
4907 return (set_errno(tdb_to_errno(err)));
4908
4909 return (ti.ti_tid);
4910 }
4911
4912 static int
4913 pt_tdb_add(const td_thrhandle_t *thp, pt_addarg_t *pap)
4914 {
4915 td_thrinfo_t ti;
4916
4917 if (pap->pa_pt->p_tdb_ops->td_thr_get_info(thp, &ti) == TD_OK &&
4918 ti.ti_state != TD_THR_ZOMBIE)
4919 mdb_addrvec_unshift(pap->pa_ap, ti.ti_tid);
4920
4921 return (0);
4922 }
4923
4924 static int
4925 pt_tdb_iter(mdb_tgt_t *t, void *tap, mdb_addrvec_t *ap)
4926 {
4927 pt_data_t *pt = t->t_data;
4928 pt_addarg_t arg;
4929 int err;
4930
4931 if (t->t_pshandle == NULL)
4932 return (set_errno(EMDB_NOPROC));
4933
4934 arg.pa_pt = pt;
4935 arg.pa_ap = ap;
4936
4937 if ((err = pt->p_tdb_ops->td_ta_thr_iter(tap, (td_thr_iter_f *)
4938 pt_tdb_add, &arg, TD_THR_ANY_STATE, TD_THR_LOWEST_PRIORITY,
4939 TD_SIGNO_MASK, TD_THR_ANY_USER_FLAGS)) != TD_OK)
4940 return (set_errno(tdb_to_errno(err)));
4941
4942 return (0);
4943 }
4944
4945 static int
4946 pt_tdb_getregs(mdb_tgt_t *t, void *tap, mdb_tgt_tid_t tid, prgregset_t gregs)
4947 {
4948 pt_data_t *pt = t->t_data;
4949
4950 td_thrhandle_t th;
4951 td_err_e err;
4952
4953 if (t->t_pshandle == NULL)
4954 return (set_errno(EMDB_NOPROC));
4955
4956 if ((err = pt->p_tdb_ops->td_ta_map_id2thr(tap, tid, &th)) != TD_OK)
4957 return (set_errno(tdb_to_errno(err)));
4958
4959 err = pt->p_tdb_ops->td_thr_getgregs(&th, gregs);
4960 if (err != TD_OK && err != TD_PARTIALREG)
4961 return (set_errno(tdb_to_errno(err)));
4962
4963 return (0);
4964 }
4965
4966 static int
4967 pt_tdb_setregs(mdb_tgt_t *t, void *tap, mdb_tgt_tid_t tid, prgregset_t gregs)
4968 {
4969 pt_data_t *pt = t->t_data;
4970
4971 td_thrhandle_t th;
4972 td_err_e err;
4973
4974 if (t->t_pshandle == NULL)
4975 return (set_errno(EMDB_NOPROC));
4976
4977 if ((err = pt->p_tdb_ops->td_ta_map_id2thr(tap, tid, &th)) != TD_OK)
4978 return (set_errno(tdb_to_errno(err)));
4979
4980 err = pt->p_tdb_ops->td_thr_setgregs(&th, gregs);
4981 if (err != TD_OK && err != TD_PARTIALREG)
4982 return (set_errno(tdb_to_errno(err)));
4983
4984 return (0);
4985 }
4986
4987 #ifdef __sparc
4988
4989 static int
4990 pt_tdb_getxregs(mdb_tgt_t *t, void *tap, mdb_tgt_tid_t tid, prxregset_t *xregs)
4991 {
4992 pt_data_t *pt = t->t_data;
4993
4994 td_thrhandle_t th;
4995 td_err_e err;
4996
4997 if (t->t_pshandle == NULL)
4998 return (set_errno(EMDB_NOPROC));
4999
5000 if ((err = pt->p_tdb_ops->td_ta_map_id2thr(tap, tid, &th)) != TD_OK)
5001 return (set_errno(tdb_to_errno(err)));
5002
5003 err = pt->p_tdb_ops->td_thr_getxregs(&th, xregs);
5004 if (err != TD_OK && err != TD_PARTIALREG)
5005 return (set_errno(tdb_to_errno(err)));
5006
5007 return (0);
5008 }
5009
5010 static int
5011 pt_tdb_setxregs(mdb_tgt_t *t, void *tap, mdb_tgt_tid_t tid,
5012 const prxregset_t *xregs)
5013 {
5014 pt_data_t *pt = t->t_data;
5015
5016 td_thrhandle_t th;
5017 td_err_e err;
5018
5019 if (t->t_pshandle == NULL)
5020 return (set_errno(EMDB_NOPROC));
5021
5022 if ((err = pt->p_tdb_ops->td_ta_map_id2thr(tap, tid, &th)) != TD_OK)
5023 return (set_errno(tdb_to_errno(err)));
5024
5025 err = pt->p_tdb_ops->td_thr_setxregs(&th, xregs);
5026 if (err != TD_OK && err != TD_PARTIALREG)
5027 return (set_errno(tdb_to_errno(err)));
5028
5029 return (0);
5030 }
5031
5032 #endif /* __sparc */
5033
5034 static int
5035 pt_tdb_getfpregs(mdb_tgt_t *t, void *tap, mdb_tgt_tid_t tid,
5036 prfpregset_t *fpregs)
5037 {
5038 pt_data_t *pt = t->t_data;
5039
5040 td_thrhandle_t th;
5041 td_err_e err;
5042
5043 if (t->t_pshandle == NULL)
5044 return (set_errno(EMDB_NOPROC));
5045
5046 if ((err = pt->p_tdb_ops->td_ta_map_id2thr(tap, tid, &th)) != TD_OK)
5047 return (set_errno(tdb_to_errno(err)));
5048
5049 err = pt->p_tdb_ops->td_thr_getfpregs(&th, fpregs);
5050 if (err != TD_OK && err != TD_PARTIALREG)
5051 return (set_errno(tdb_to_errno(err)));
5052
5053 return (0);
5054 }
5055
5056 static int
5057 pt_tdb_setfpregs(mdb_tgt_t *t, void *tap, mdb_tgt_tid_t tid,
5058 const prfpregset_t *fpregs)
5059 {
5060 pt_data_t *pt = t->t_data;
5061
5062 td_thrhandle_t th;
5063 td_err_e err;
5064
5065 if (t->t_pshandle == NULL)
5066 return (set_errno(EMDB_NOPROC));
5067
5068 if ((err = pt->p_tdb_ops->td_ta_map_id2thr(tap, tid, &th)) != TD_OK)
5069 return (set_errno(tdb_to_errno(err)));
5070
5071 err = pt->p_tdb_ops->td_thr_setfpregs(&th, fpregs);
5072 if (err != TD_OK && err != TD_PARTIALREG)
5073 return (set_errno(tdb_to_errno(err)));
5074
5075 return (0);
5076 }
5077
5078 static const pt_ptl_ops_t proc_tdb_ops = {
5079 pt_tdb_ctor,
5080 pt_tdb_dtor,
5081 pt_tdb_tid,
5082 pt_tdb_iter,
5083 pt_tdb_getregs,
5084 pt_tdb_setregs,
5085 #ifdef __sparc
5086 pt_tdb_getxregs,
5087 pt_tdb_setxregs,
5088 #endif
5089 pt_tdb_getfpregs,
5090 pt_tdb_setfpregs
5091 };
5092
5093 static ssize_t
5094 pt_xd_auxv(mdb_tgt_t *t, void *buf, size_t nbytes)
5095 {
5096 struct ps_prochandle *P = t->t_pshandle;
5097 const auxv_t *auxp, *auxv = NULL;
5098 int auxn = 0;
5099
5100 if (P != NULL && (auxv = Pgetauxvec(P)) != NULL &&
5101 auxv->a_type != AT_NULL) {
5102 for (auxp = auxv, auxn = 1; auxp->a_type != NULL; auxp++)
5103 auxn++;
5104 }
5105
5106 if (buf == NULL && nbytes == 0)
5107 return (sizeof (auxv_t) * auxn);
5108
5109 if (auxn == 0)
5110 return (set_errno(ENODATA));
5111
5112 nbytes = MIN(nbytes, sizeof (auxv_t) * auxn);
5113 bcopy(auxv, buf, nbytes);
5114 return (nbytes);
5115 }
5116
5117 static ssize_t
5118 pt_xd_cred(mdb_tgt_t *t, void *buf, size_t nbytes)
5119 {
5120 prcred_t cr, *crp;
5121 size_t cbytes = 0;
5122
5123 if (t->t_pshandle != NULL && Pcred(t->t_pshandle, &cr, 1) == 0) {
5124 cbytes = (cr.pr_ngroups <= 1) ? sizeof (prcred_t) :
5125 (sizeof (prcred_t) + (cr.pr_ngroups - 1) * sizeof (gid_t));
5126 }
5127
5128 if (buf == NULL && nbytes == 0)
5129 return (cbytes);
5130
5131 if (cbytes == 0)
5132 return (set_errno(ENODATA));
5133
5134 crp = mdb_alloc(cbytes, UM_SLEEP);
5135
5136 if (Pcred(t->t_pshandle, crp, cr.pr_ngroups) == -1)
5137 return (set_errno(ENODATA));
5138
5139 nbytes = MIN(nbytes, cbytes);
5140 bcopy(crp, buf, nbytes);
5141 mdb_free(crp, cbytes);
5142 return (nbytes);
5143 }
5144
5145 static ssize_t
5146 pt_xd_ehdr(mdb_tgt_t *t, void *buf, size_t nbytes)
5147 {
5148 pt_data_t *pt = t->t_data;
5149
5150 if (buf == NULL && nbytes == 0)
5151 return (sizeof (GElf_Ehdr));
5152
5153 if (pt->p_file == NULL)
5154 return (set_errno(ENODATA));
5155
5156 nbytes = MIN(nbytes, sizeof (GElf_Ehdr));
5157 bcopy(&pt->p_file->gf_ehdr, buf, nbytes);
5158 return (nbytes);
5159 }
5160
5161 static int
5162 pt_copy_lwp(lwpstatus_t **lspp, const lwpstatus_t *lsp)
5163 {
5164 bcopy(lsp, *lspp, sizeof (lwpstatus_t));
5165 (*lspp)++;
5166 return (0);
5167 }
5168
5169 static ssize_t
5170 pt_xd_lwpstatus(mdb_tgt_t *t, void *buf, size_t nbytes)
5171 {
5172 lwpstatus_t *lsp, *lbuf;
5173 const pstatus_t *psp;
5174 int nlwp = 0;
5175
5176 if (t->t_pshandle != NULL && (psp = Pstatus(t->t_pshandle)) != NULL)
5177 nlwp = psp->pr_nlwp;
5178
5179 if (buf == NULL && nbytes == 0)
5180 return (sizeof (lwpstatus_t) * nlwp);
5181
5182 if (nlwp == 0)
5183 return (set_errno(ENODATA));
5184
5185 lsp = lbuf = mdb_alloc(sizeof (lwpstatus_t) * nlwp, UM_SLEEP);
5186 nbytes = MIN(nbytes, sizeof (lwpstatus_t) * nlwp);
5187
5188 (void) Plwp_iter(t->t_pshandle, (proc_lwp_f *)pt_copy_lwp, &lsp);
5189 bcopy(lbuf, buf, nbytes);
5190
5191 mdb_free(lbuf, sizeof (lwpstatus_t) * nlwp);
5192 return (nbytes);
5193 }
5194
5195 static ssize_t
5196 pt_xd_pshandle(mdb_tgt_t *t, void *buf, size_t nbytes)
5197 {
5198 if (buf == NULL && nbytes == 0)
5199 return (sizeof (struct ps_prochandle *));
5200
5201 if (t->t_pshandle == NULL || nbytes != sizeof (struct ps_prochandle *))
5202 return (set_errno(ENODATA));
5203
5204 bcopy(&t->t_pshandle, buf, nbytes);
5205 return (nbytes);
5206 }
5207
5208 static ssize_t
5209 pt_xd_psinfo(mdb_tgt_t *t, void *buf, size_t nbytes)
5210 {
5211 const psinfo_t *psp;
5212
5213 if (buf == NULL && nbytes == 0)
5214 return (sizeof (psinfo_t));
5215
5216 if (t->t_pshandle == NULL || (psp = Ppsinfo(t->t_pshandle)) == NULL)
5217 return (set_errno(ENODATA));
5218
5219 nbytes = MIN(nbytes, sizeof (psinfo_t));
5220 bcopy(psp, buf, nbytes);
5221 return (nbytes);
5222 }
5223
5224 static ssize_t
5225 pt_xd_pstatus(mdb_tgt_t *t, void *buf, size_t nbytes)
5226 {
5227 const pstatus_t *psp;
5228
5229 if (buf == NULL && nbytes == 0)
5230 return (sizeof (pstatus_t));
5231
5232 if (t->t_pshandle == NULL || (psp = Pstatus(t->t_pshandle)) == NULL)
5233 return (set_errno(ENODATA));
5234
5235 nbytes = MIN(nbytes, sizeof (pstatus_t));
5236 bcopy(psp, buf, nbytes);
5237 return (nbytes);
5238 }
5239
5240 static ssize_t
5241 pt_xd_utsname(mdb_tgt_t *t, void *buf, size_t nbytes)
5242 {
5243 struct utsname uts;
5244
5245 if (buf == NULL && nbytes == 0)
5246 return (sizeof (struct utsname));
5247
5248 if (t->t_pshandle == NULL || Puname(t->t_pshandle, &uts) != 0)
5249 return (set_errno(ENODATA));
5250
5251 nbytes = MIN(nbytes, sizeof (struct utsname));
5252 bcopy(&uts, buf, nbytes);
5253 return (nbytes);
5254 }
5255
5256 int
5257 mdb_proc_tgt_create(mdb_tgt_t *t, int argc, const char *argv[])
5258 {
5259 pt_data_t *pt = mdb_zalloc(sizeof (pt_data_t), UM_SLEEP);
5260
5261 const char *aout_path = argc > 0 ? argv[0] : PT_EXEC_PATH;
5262 const char *core_path = argc > 1 ? argv[1] : NULL;
5263
5264 const mdb_tgt_regdesc_t *rdp;
5265 char execname[MAXPATHLEN];
5266 struct stat64 st;
5267 int perr;
5268 int state;
5269 struct rlimit rlim;
5270 int i;
5271
5272 if (argc > 2) {
5273 mdb_free(pt, sizeof (pt_data_t));
5274 return (set_errno(EINVAL));
5275 }
5276
5277 if (t->t_flags & MDB_TGT_F_RDWR)
5278 pt->p_oflags = O_RDWR;
5279 else
5280 pt->p_oflags = O_RDONLY;
5281
5282 if (t->t_flags & MDB_TGT_F_FORCE)
5283 pt->p_gflags |= PGRAB_FORCE;
5284 if (t->t_flags & MDB_TGT_F_NOSTOP)
5285 pt->p_gflags |= PGRAB_NOSTOP;
5286
5287 pt->p_ptl_ops = &proc_lwp_ops;
5288 pt->p_maxsig = sysconf(_SC_SIGRT_MAX);
5289
5290 (void) mdb_nv_create(&pt->p_regs, UM_SLEEP);
5291 (void) mdb_nv_create(&pt->p_env, UM_SLEEP);
5292
5293 t->t_ops = &proc_ops;
5294 t->t_data = pt;
5295
5296 /*
5297 * If no core file name was specified, but the file ./core is present,
5298 * infer that we want to debug it. I find this behavior confusing,
5299 * so we only do this when precise adb(1) compatibility is required.
5300 */
5301 if (core_path == NULL && (mdb.m_flags & MDB_FL_ADB) &&
5302 access(PT_CORE_PATH, F_OK) == 0)
5303 core_path = PT_CORE_PATH;
5304
5305 /*
5306 * For compatibility with adb(1), the special name "-" may be used
5307 * to suppress the loading of the executable or core file.
5308 */
5309 if (aout_path != NULL && strcmp(aout_path, "-") == 0)
5310 aout_path = NULL;
5311 if (core_path != NULL && strcmp(core_path, "-") == 0)
5312 core_path = NULL;
5313
5314 /*
5315 * If a core file or pid was specified, attempt to grab it now using
5316 * proc_arg_grab(); otherwise we'll create a fresh process later.
5317 */
5318 if (core_path != NULL && (t->t_pshandle = proc_arg_xgrab(core_path,
5319 aout_path == PT_EXEC_PATH ? NULL : aout_path, PR_ARG_ANY,
5320 pt->p_gflags, &perr, NULL)) == NULL) {
5321 mdb_warn("cannot debug %s: %s\n", core_path, Pgrab_error(perr));
5322 goto err;
5323 }
5324
5325 if (aout_path != NULL &&
5326 (pt->p_idlehandle = Pgrab_file(aout_path, &perr)) != NULL &&
5327 t->t_pshandle == NULL)
5328 t->t_pshandle = pt->p_idlehandle;
5329
5330 if (t->t_pshandle != NULL)
5331 state = Pstate(t->t_pshandle);
5332
5333 /*
5334 * Make sure we'll have enough file descriptors to handle a target
5335 * has many many mappings.
5336 */
5337 if (getrlimit(RLIMIT_NOFILE, &rlim) == 0) {
5338 rlim.rlim_cur = rlim.rlim_max;
5339 (void) setrlimit(RLIMIT_NOFILE, &rlim);
5340 (void) enable_extended_FILE_stdio(-1, -1);
5341 }
5342
5343 /*
5344 * If we don't have an executable path or the executable path is the
5345 * /proc/<pid>/object/a.out path, but we now have a libproc handle,
5346 * attempt to derive the executable path using Pexecname(). We need
5347 * to do this in the /proc case in order to open the executable for
5348 * writing because /proc/object/<file> permission are masked with 0555.
5349 * If Pexecname() fails us, fall back to /proc/<pid>/object/a.out.
5350 */
5351 if (t->t_pshandle != NULL && (aout_path == NULL || (stat64(aout_path,
5352 &st) == 0 && strcmp(st.st_fstype, "proc") == 0))) {
5353 GElf_Sym s;
5354 aout_path = Pexecname(t->t_pshandle, execname, MAXPATHLEN);
5355 if (aout_path == NULL && state != PS_DEAD && state != PS_IDLE) {
5356 (void) mdb_iob_snprintf(execname, sizeof (execname),
5357 "/proc/%d/object/a.out",
5358 (int)Pstatus(t->t_pshandle)->pr_pid);
5359 aout_path = execname;
5360 }
5361 if (aout_path == NULL &&
5362 Plookup_by_name(t->t_pshandle, "a.out", "_start", &s) != 0)
5363 mdb_warn("warning: failed to infer pathname to "
5364 "executable; symbol table will not be available\n");
5365
5366 mdb_dprintf(MDB_DBG_TGT, "a.out is %s\n", aout_path);
5367 }
5368
5369 /*
5370 * Attempt to open the executable file. We only want this operation
5371 * to actually cause the constructor to abort if the executable file
5372 * name was given explicitly. If we defaulted to PT_EXEC_PATH or
5373 * derived the executable using Pexecname, then we want to continue
5374 * along with p_fio and p_file set to NULL.
5375 */
5376 if (aout_path != NULL && (pt->p_aout_fio = mdb_fdio_create_path(NULL,
5377 aout_path, pt->p_oflags, 0)) == NULL && argc > 0) {
5378 mdb_warn("failed to open %s", aout_path);
5379 goto err;
5380 }
5381
5382 /*
5383 * Now create an ELF file from the input file, if we have one. Again,
5384 * only abort the constructor if the name was given explicitly.
5385 */
5386 if (pt->p_aout_fio != NULL && pt_open_aout(t,
5387 mdb_io_hold(pt->p_aout_fio)) == NULL && argc > 0)
5388 goto err;
5389
5390 /*
5391 * If we've successfully opened an ELF file, select the appropriate
5392 * disassembler based on the ELF header.
5393 */
5394 if (pt->p_file != NULL)
5395 (void) mdb_dis_select(pt_disasm(&pt->p_file->gf_ehdr));
5396 else
5397 (void) mdb_dis_select(pt_disasm(NULL));
5398
5399 /*
5400 * Add each register described in the target ISA register description
5401 * list to our hash table of register descriptions and then add any
5402 * appropriate ISA-specific floating-point register descriptions.
5403 */
5404 for (rdp = pt_regdesc; rdp->rd_name != NULL; rdp++) {
5405 (void) mdb_nv_insert(&pt->p_regs, rdp->rd_name, NULL,
5406 MDB_TGT_R_NVAL(rdp->rd_num, rdp->rd_flags), MDB_NV_RDONLY);
5407 }
5408 pt_addfpregs(t);
5409
5410 /*
5411 * Certain important /proc structures may be of interest to mdb
5412 * modules and their dcmds. Export these using the xdata interface:
5413 */
5414 (void) mdb_tgt_xdata_insert(t, "auxv",
5415 "procfs auxv_t array", pt_xd_auxv);
5416 (void) mdb_tgt_xdata_insert(t, "cred",
5417 "procfs prcred_t structure", pt_xd_cred);
5418 (void) mdb_tgt_xdata_insert(t, "ehdr",
5419 "executable file GElf_Ehdr structure", pt_xd_ehdr);
5420 (void) mdb_tgt_xdata_insert(t, "lwpstatus",
5421 "procfs lwpstatus_t array", pt_xd_lwpstatus);
5422 (void) mdb_tgt_xdata_insert(t, "pshandle",
5423 "libproc proc service API handle", pt_xd_pshandle);
5424 (void) mdb_tgt_xdata_insert(t, "psinfo",
5425 "procfs psinfo_t structure", pt_xd_psinfo);
5426 (void) mdb_tgt_xdata_insert(t, "pstatus",
5427 "procfs pstatus_t structure", pt_xd_pstatus);
5428 (void) mdb_tgt_xdata_insert(t, "utsname",
5429 "utsname structure", pt_xd_utsname);
5430
5431 /*
5432 * Force a status update now so that we fill in t_status with the
5433 * latest information based on any successful grab.
5434 */
5435 (void) mdb_tgt_status(t, &t->t_status);
5436
5437 /*
5438 * If we're not examining a core file, trace SIGINT and all signals
5439 * that cause the process to dump core as part of our initialization.
5440 */
5441 if ((t->t_pshandle != NULL && state != PS_DEAD && state != PS_IDLE) ||
5442 (pt->p_file != NULL && pt->p_file->gf_ehdr.e_type == ET_EXEC)) {
5443
5444 int tflag = MDB_TGT_SPEC_STICKY; /* default sigs are sticky */
5445
5446 (void) mdb_tgt_add_signal(t, SIGINT, tflag, no_se_f, NULL);
5447 (void) mdb_tgt_add_signal(t, SIGQUIT, tflag, no_se_f, NULL);
5448 (void) mdb_tgt_add_signal(t, SIGILL, tflag, no_se_f, NULL);
5449 (void) mdb_tgt_add_signal(t, SIGTRAP, tflag, no_se_f, NULL);
5450 (void) mdb_tgt_add_signal(t, SIGABRT, tflag, no_se_f, NULL);
5451 (void) mdb_tgt_add_signal(t, SIGEMT, tflag, no_se_f, NULL);
5452 (void) mdb_tgt_add_signal(t, SIGFPE, tflag, no_se_f, NULL);
5453 (void) mdb_tgt_add_signal(t, SIGBUS, tflag, no_se_f, NULL);
5454 (void) mdb_tgt_add_signal(t, SIGSEGV, tflag, no_se_f, NULL);
5455 (void) mdb_tgt_add_signal(t, SIGSYS, tflag, no_se_f, NULL);
5456 (void) mdb_tgt_add_signal(t, SIGXCPU, tflag, no_se_f, NULL);
5457 (void) mdb_tgt_add_signal(t, SIGXFSZ, tflag, no_se_f, NULL);
5458 }
5459
5460 /*
5461 * If we've grabbed a live process, establish our initial breakpoints
5462 * and librtld_db agent so we can track rtld activity. If FL_VCREATE
5463 * is set, this process was created by a previous instantiation of
5464 * the debugger, so reset pr_flags to kill it; otherwise we attached
5465 * to an already running process. Pgrab() has already set the PR_RLC
5466 * flag appropriately based on whether the process was stopped when we
5467 * attached.
5468 */
5469 if (t->t_pshandle != NULL && state != PS_DEAD && state != PS_IDLE) {
5470 if (mdb.m_flags & MDB_FL_VCREATE) {
5471 (void) Punsetflags(t->t_pshandle, PR_RLC);
5472 (void) Psetflags(t->t_pshandle, PR_KLC);
5473 pt->p_rflags = PRELEASE_KILL;
5474 } else {
5475 (void) Punsetflags(t->t_pshandle, PR_KLC);
5476 }
5477 pt_post_attach(t);
5478 }
5479
5480 /*
5481 * Initialize a local copy of the environment, which can be modified
5482 * before running the program.
5483 */
5484 for (i = 0; mdb.m_env[i] != NULL; i++)
5485 pt_env_set(pt, mdb.m_env[i]);
5486
5487 /*
5488 * If adb(1) compatibility mode is on, then print the appropriate
5489 * greeting message if we have grabbed a core file.
5490 */
5491 if ((mdb.m_flags & MDB_FL_ADB) && t->t_pshandle != NULL &&
5492 state == PS_DEAD) {
5493 const pstatus_t *psp = Pstatus(t->t_pshandle);
5494 int cursig = psp->pr_lwp.pr_cursig;
5495 char signame[SIG2STR_MAX];
5496
5497 mdb_printf("core file = %s -- program ``%s'' on platform %s\n",
5498 core_path, aout_path ? aout_path : "?", pt_platform(t));
5499
5500 if (cursig != 0 && sig2str(cursig, signame) == 0)
5501 mdb_printf("SIG%s: %s\n", signame, strsignal(cursig));
5502 }
5503
5504 return (0);
5505
5506 err:
5507 pt_destroy(t);
5508 return (-1);
5509 }