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 (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Copyright (c) 2012 by Delphix. All rights reserved.
25 * Copyright (c) 2019 Carlos Neira <cneirabustos@gmail.com>
26 * Copyright 2019 OmniOS Community Edition (OmniOSce) Association.
27 * Copyright 2019 Joyent, Inc.
28 * Copyright 2024 Oxide Computer Company
29 */
30
31 #include <sys/mdb_modapi.h>
32 #include <mdb/mdb_whatis.h>
33 #include <mdb/mdb_ctf.h>
34 #include <procfs.h>
35 #include <ucontext.h>
36 #include <siginfo.h>
37 #include <signal.h>
38 #include <setjmp.h>
39 #include <string.h>
40 #include <thr_uberdata.h>
41 #include "findstack.h"
42 #include <libproc.h>
43
44 static const char *
stack_flags(const stack_t * sp)45 stack_flags(const stack_t *sp)
46 {
47 static char buf[32];
48
49 if (sp->ss_flags == 0)
50 (void) strcpy(buf, " 0");
51 else if (sp->ss_flags & ~(SS_ONSTACK | SS_DISABLE))
52 (void) mdb_snprintf(buf, sizeof (buf), " 0x%x", sp->ss_flags);
53 else {
54 buf[0] = '\0';
55 if (sp->ss_flags & SS_ONSTACK)
56 (void) strcat(buf, "|ONSTACK");
57 if (sp->ss_flags & SS_DISABLE)
58 (void) strcat(buf, "|DISABLE");
59 }
60
61 return (buf + 1);
62 }
63
64 /*ARGSUSED*/
65 static int
d_jmp_buf(uintptr_t addr,uint_t flags,int argc,const mdb_arg_t * argv)66 d_jmp_buf(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
67 {
68 jmp_buf jb;
69 const ulong_t *b = (const ulong_t *)jb;
70
71 if (argc != 0)
72 return (DCMD_USAGE);
73
74 if (mdb_vread(&jb, sizeof (jb), addr) != sizeof (jb)) {
75 mdb_warn("failed to read jmp_buf at %p", addr);
76 return (DCMD_ERR);
77 }
78
79 #if defined(__sparc)
80 mdb_printf(" %%sp = 0x%lx\n", b[1]);
81 mdb_printf(" %%pc = 0x%lx %lA\n", b[2], b[2]);
82 mdb_printf(" %%fp = 0x%lx\n", b[3]);
83 mdb_printf(" %%i7 = 0x%lx %lA\n", b[4], b[4]);
84 #elif defined(__amd64)
85 mdb_printf(" %%rbx = 0x%lx\n", b[0]);
86 mdb_printf(" %%r12 = 0x%lx\n", b[1]);
87 mdb_printf(" %%r13 = 0x%lx\n", b[2]);
88 mdb_printf(" %%r14 = 0x%lx\n", b[3]);
89 mdb_printf(" %%r15 = 0x%lx\n", b[4]);
90 mdb_printf(" %%rbp = 0x%lx\n", b[5]);
91 mdb_printf(" %%rsp = 0x%lx\n", b[6]);
92 mdb_printf(" %%rip = 0x%lx %lA\n", b[7], b[7]);
93 #elif defined(__i386)
94 mdb_printf(" %%ebx = 0x%lx\n", b[0]);
95 mdb_printf(" %%esi = 0x%lx\n", b[1]);
96 mdb_printf(" %%edi = 0x%lx\n", b[2]);
97 mdb_printf(" %%ebp = 0x%lx\n", b[3]);
98 mdb_printf(" %%esp = 0x%lx\n", b[4]);
99 mdb_printf(" %%eip = 0x%lx %lA\n", b[5], b[5]);
100 #endif
101 return (DCMD_OK);
102 }
103
104 const mdb_bitmask_t uc_flags_bits[] = {
105 { "UC_SIGMASK", UC_SIGMASK, UC_SIGMASK },
106 { "UC_STACK", UC_STACK, UC_STACK },
107 { "UC_CPU", UC_CPU, UC_CPU },
108 { "UC_FPU", UC_FPU, UC_FPU },
109 #if defined(UC_INTR)
110 { "UC_INTR", UC_INTR, UC_INTR },
111 #endif
112 #if defined(UC_ASR)
113 { "UC_ASR", UC_ASR, UC_ASR },
114 #endif
115 { NULL, 0, 0 }
116 };
117
118 /*ARGSUSED*/
119 static int
d_ucontext(uintptr_t addr,uint_t flags,int argc,const mdb_arg_t * argv)120 d_ucontext(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
121 {
122 ucontext_t uc;
123
124 if (argc != 0)
125 return (DCMD_USAGE);
126
127 if (mdb_vread(&uc, sizeof (uc), addr) != sizeof (uc)) {
128 mdb_warn("failed to read ucontext at %p", addr);
129 return (DCMD_ERR);
130 }
131
132 mdb_printf(" flags = 0x%lx <%b>\n", uc.uc_flags,
133 (uint_t)uc.uc_flags, uc_flags_bits);
134 mdb_printf(" link = 0x%p\n", uc.uc_link);
135 mdb_printf(" sigmask = 0x%08x 0x%08x 0x%08x 0x%08x\n",
136 uc.uc_sigmask.__sigbits[0], uc.uc_sigmask.__sigbits[1],
137 uc.uc_sigmask.__sigbits[2], uc.uc_sigmask.__sigbits[3]);
138 mdb_printf(" stack = sp 0x%p size 0x%lx flags %s\n",
139 uc.uc_stack.ss_sp, uc.uc_stack.ss_size, stack_flags(&uc.uc_stack));
140 mdb_printf(" mcontext = 0x%p\n",
141 addr + OFFSETOF(ucontext_t, uc_mcontext));
142
143 return (DCMD_OK);
144 }
145
146 /*ARGSUSED*/
147 static int
d_sigjmp_buf(uintptr_t addr,uint_t flags,int argc,const mdb_arg_t * argv)148 d_sigjmp_buf(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
149 {
150 #if defined(__sparc)
151 struct {
152 int sjs_flags;
153 greg_t sjs_sp;
154 greg_t sjs_pc;
155 greg_t sjs_fp;
156 greg_t sjs_i7;
157 ucontext_t *sjs_uclink;
158 ulong_t sjs_pad[_JBLEN - 6];
159 sigset_t sjs_sigmask;
160 #if defined(_LP64)
161 greg_t sjs_asi;
162 greg_t sjs_fprs;
163 #endif
164 stack_t sjs_stack;
165 } s;
166
167 if (argc != 0)
168 return (DCMD_USAGE);
169
170 if (mdb_vread(&s, sizeof (s), addr) != sizeof (s)) {
171 mdb_warn("failed to read sigjmp_buf at %p", addr);
172 return (DCMD_ERR);
173 }
174
175 mdb_printf(" flags = 0x%x\n", s.sjs_flags);
176 mdb_printf(" %%sp = 0x%lx %lA\n", s.sjs_sp, s.sjs_sp);
177 mdb_printf(" %%pc = 0x%lx %lA\n", s.sjs_pc, s.sjs_pc);
178 mdb_printf(" %%fp = 0x%lx %lA\n", s.sjs_fp, s.sjs_fp);
179 mdb_printf(" %%i7 = 0x%lx %lA\n", s.sjs_i7, s.sjs_i7);
180 mdb_printf(" uclink = %p\n", s.sjs_uclink);
181 mdb_printf(" sigset = 0x%08x 0x%08x 0x%08x 0x%08x\n",
182 s.sjs_sigmask.__sigbits[0], s.sjs_sigmask.__sigbits[1],
183 s.sjs_sigmask.__sigbits[2], s.sjs_sigmask.__sigbits[3]);
184 #if defined(_LP64)
185 mdb_printf(" %%asi = 0x%lx\n", s.sjs_asi);
186 mdb_printf(" %%fprs = 0x%lx\n", s.sjs_fprs);
187 #endif
188 mdb_printf(" stack = sp 0x%p size 0x%lx flags %s\n",
189 s.sjs_stack.ss_sp, s.sjs_stack.ss_size, stack_flags(&s.sjs_stack));
190
191 return (DCMD_OK);
192
193 #elif defined(__i386) || defined(__amd64)
194 return (d_ucontext(addr, flags, argc, argv));
195 #endif
196 }
197
198 /*ARGSUSED*/
199 static int
d_siginfo(uintptr_t addr,uint_t flags,int argc,const mdb_arg_t * argv)200 d_siginfo(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
201 {
202 static const char *const msname[] = {
203 "USER", "SYSTEM", "TRAP", "TFAULT", "DFAULT", "KFAULT",
204 "USER_LOCK", "SLEEP", "WAIT_CPU", "STOPPED"
205 };
206
207 char signame[SIG2STR_MAX];
208 siginfo_t si;
209 int i;
210
211 if (argc != 0)
212 return (DCMD_USAGE);
213
214 if (mdb_vread(&si, sizeof (si), addr) != sizeof (si)) {
215 mdb_warn("failed to read siginfo at %p", addr);
216 return (DCMD_ERR);
217 }
218
219 if (sig2str(si.si_signo, signame) == -1)
220 (void) strcpy(signame, "unknown");
221
222 mdb_printf(" signal %5d (%s)\n", si.si_signo, signame);
223 mdb_printf(" code %5d (", si.si_code);
224
225 switch (si.si_code) {
226 case SI_NOINFO:
227 mdb_printf("no info");
228 break;
229 case SI_DTRACE:
230 mdb_printf("from DTrace raise() action");
231 break;
232 case SI_RCTL:
233 mdb_printf("from rctl action");
234 break;
235 case SI_USER:
236 mdb_printf("user generated via kill");
237 break;
238 case SI_LWP:
239 mdb_printf("user generated via lwp_kill");
240 break;
241 case SI_QUEUE:
242 mdb_printf("user generated via sigqueue");
243 break;
244 case SI_TIMER:
245 mdb_printf("from timer expiration");
246 break;
247 case SI_ASYNCIO:
248 mdb_printf("from async i/o completion");
249 break;
250 case SI_MESGQ:
251 mdb_printf("from message arrival");
252 break;
253 default:
254 if (SI_FROMUSER(&si))
255 mdb_printf("from user process");
256 else
257 mdb_printf("from kernel");
258 }
259
260 mdb_printf(")\n errno %5d (%s)\n",
261 si.si_errno, strerror(si.si_errno));
262
263 if (si.si_code == SI_USER || si.si_code == SI_QUEUE) {
264 mdb_printf(" signal sent from PID %d (uid %d)\n",
265 si.si_pid, si.si_uid);
266 }
267
268 if (si.si_code == SI_QUEUE) {
269 mdb_printf(" signal value = 0t%d / %p\n",
270 si.si_value.sival_int, si.si_value.sival_ptr);
271 }
272
273 switch (si.si_signo) {
274 case SIGCLD:
275 mdb_printf(" signal sent from child PID %d (uid %d)\n",
276 si.si_pid, si.si_uid);
277 mdb_printf(" usr time = 0t%ld ticks, sys time = 0t%ld ticks\n",
278 si.si_utime, si.si_stime);
279 mdb_printf(" wait status = 0x%x\n", si.si_status);
280 break;
281
282 case SIGSEGV:
283 case SIGBUS:
284 case SIGILL:
285 case SIGTRAP:
286 case SIGFPE:
287 mdb_printf(" fault address = 0x%p\n trapno = %d\n",
288 si.si_addr, si.si_trapno);
289 mdb_printf(" instruction address = 0x%p %lA\n",
290 si.si_pc, si.si_pc);
291 break;
292
293 case SIGPOLL:
294 case SIGXFSZ:
295 mdb_printf(" fd = %d band = 0x%lx\n",
296 si.si_fd, si.si_band);
297 break;
298
299 case SIGPROF:
300 mdb_printf(" last fault address = 0x%p fault type = %d\n",
301 si.si_faddr, si.si_fault);
302 mdb_printf(" timestamp = 0t%ld sec 0t%ld nsec\n",
303 si.si_tstamp.tv_sec, si.si_tstamp.tv_nsec);
304
305 if (si.__data.__prof.__syscall != 0) {
306 mdb_printf(" system call %d (", si.si_syscall);
307 if (si.si_nsysarg > 0) {
308 mdb_printf("%lx", si.si_sysarg[0]);
309 for (i = 1; i < si.si_nsysarg; i++)
310 mdb_printf(", %lx", si.si_sysarg[i]);
311 }
312 mdb_printf(" )\n");
313 }
314
315 for (i = 0; i < sizeof (msname) / sizeof (msname[0]); i++) {
316 mdb_printf(" mstate[\"%s\"] = %d\n",
317 msname[i], si.si_mstate[i]);
318 }
319 break;
320 }
321
322 return (DCMD_OK);
323 }
324
325 static int
uc_walk_step(mdb_walk_state_t * wsp)326 uc_walk_step(mdb_walk_state_t *wsp)
327 {
328 uintptr_t addr = wsp->walk_addr;
329 ucontext_t uc;
330
331 if (addr == 0)
332 return (WALK_DONE);
333
334 if (mdb_vread(&uc, sizeof (uc), addr) != sizeof (uc)) {
335 mdb_warn("failed to read ucontext at %p", addr);
336 return (WALK_ERR);
337 }
338
339 wsp->walk_addr = (uintptr_t)uc.uc_link;
340 return (wsp->walk_callback(addr, &uc, wsp->walk_cbdata));
341 }
342
343 static int
oldc_walk_init(mdb_walk_state_t * wsp)344 oldc_walk_init(mdb_walk_state_t *wsp)
345 {
346 ssize_t nbytes = mdb_get_xdata("lwpstatus", NULL, 0);
347
348 if (nbytes <= 0) {
349 mdb_warn("lwpstatus information not available");
350 return (WALK_ERR);
351 }
352
353 if (wsp->walk_addr != 0) {
354 mdb_warn("walker only supports global walk\n");
355 return (WALK_ERR);
356 }
357
358 wsp->walk_addr = nbytes; /* Use walk_addr to track size */
359 wsp->walk_data = mdb_alloc(nbytes, UM_SLEEP);
360
361 if (mdb_get_xdata("lwpstatus", wsp->walk_data, nbytes) != nbytes) {
362 mdb_warn("failed to read lwpstatus information");
363 mdb_free(wsp->walk_data, nbytes);
364 return (WALK_ERR);
365 }
366
367 wsp->walk_arg = wsp->walk_data; /* Use walk_arg to track pointer */
368 return (WALK_NEXT);
369 }
370
371 static int
oldc_walk_step(mdb_walk_state_t * wsp)372 oldc_walk_step(mdb_walk_state_t *wsp)
373 {
374 const lwpstatus_t *lsp, *end;
375
376 end = (const lwpstatus_t *)((uintptr_t)wsp->walk_data + wsp->walk_addr);
377 lsp = wsp->walk_arg;
378
379 wsp->walk_arg = (void *)(lsp + 1);
380
381 if (lsp < end) {
382 uintptr_t addr = lsp->pr_oldcontext;
383 ucontext_t uc;
384
385 if (addr == 0)
386 return (WALK_NEXT);
387
388 if (mdb_vread(&uc, sizeof (uc), addr) != sizeof (uc)) {
389 mdb_warn("failed to read ucontext at %p", addr);
390 return (WALK_NEXT);
391 }
392
393 return (wsp->walk_callback(addr, &uc, wsp->walk_cbdata));
394 }
395
396 return (WALK_DONE);
397 }
398
399 static void
oldc_walk_fini(mdb_walk_state_t * wsp)400 oldc_walk_fini(mdb_walk_state_t *wsp)
401 {
402 mdb_free(wsp->walk_data, wsp->walk_addr); /* walk_addr has size */
403 }
404
405 /*
406 * ==================== threads ==========================
407 * These are the interfaces that used to require libthread.
408 * Now, libthread has been folded into libc.
409 * =======================================================
410 */
411
412 /*
413 * prt_addr() is called up to three times to generate arguments for
414 * one call to mdb_printf(). We must return at least three different
415 * pointers to static storage for consecutive calls to prt_addr().
416 */
417 static const char *
prt_addr(void * addr,int pad)418 prt_addr(void *addr, int pad)
419 {
420 static char buffer[4][24];
421 static int ix = 0;
422 char *buf;
423
424 if (ix == 4) /* use buffers in sequence: 0, 1, 2, 3 */
425 ix = 0;
426 buf = buffer[ix++];
427 if (addr == NULL)
428 return (pad? "<NULL> " : "<NULL>");
429 else {
430 #ifdef _LP64
431 (void) mdb_snprintf(buf, sizeof (buffer[0]), "0x%016lx", addr);
432 if (pad)
433 (void) strcpy(buf + 18, " ");
434 #else
435 (void) mdb_snprintf(buf, sizeof (buffer[0]), "0x%08lx", addr);
436 if (pad)
437 (void) strcpy(buf + 10, " ");
438 #endif /* _LP64 */
439 return (buf);
440 }
441 }
442
443 #define HD(str) mdb_printf(" " str "\n")
444 #define OFFSTR "+0x%-7lx "
445 #define OFFSET(member) ((size_t)OFFSETOF(ulwp_t, member))
446
447 /*ARGSUSED*/
448 static int
d_ulwp(uintptr_t addr,uint_t flags,int argc,const mdb_arg_t * argv)449 d_ulwp(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
450 {
451 ulwp_t ulwp;
452
453 if (argc != 0 || !(flags & DCMD_ADDRSPEC))
454 return (DCMD_USAGE);
455
456 if (mdb_vread(&ulwp, sizeof (ulwp), addr) != sizeof (ulwp) &&
457 (bzero(&ulwp, sizeof (ulwp)),
458 mdb_vread(&ulwp, REPLACEMENT_SIZE, addr)) != REPLACEMENT_SIZE) {
459 mdb_warn("failed to read ulwp at 0x%p", addr);
460 return (DCMD_ERR);
461 }
462
463 mdb_printf("%#a\n", addr);
464
465 HD("self uberdata");
466 mdb_printf(OFFSTR "%s %s\n",
467 OFFSET(ul_self),
468 prt_addr(ulwp.ul_self, 1),
469 prt_addr(ulwp.ul_uberdata, 0));
470
471 HD("tlsent ntlsent");
472 mdb_printf(OFFSTR "%s %ld\n",
473 OFFSET(ul_tlsent),
474 prt_addr(ulwp.ul_tlsent, 1),
475 ulwp.ul_ntlsent);
476
477 HD("forw back next");
478 mdb_printf(OFFSTR "%s %s %s\n",
479 OFFSET(ul_forw),
480 prt_addr(ulwp.ul_forw, 1),
481 prt_addr(ulwp.ul_back, 1),
482 prt_addr(ulwp.ul_next, 0));
483
484 HD("hash rval stk");
485 mdb_printf(OFFSTR "%s %s %s\n",
486 OFFSET(ul_hash),
487 prt_addr(ulwp.ul_hash, 1),
488 prt_addr(ulwp.ul_rval, 1),
489 prt_addr(ulwp.ul_stk, 0));
490
491 HD("mapsiz guardsize stktop stksiz");
492 mdb_printf(OFFSTR "%-10ld %-10ld %s %ld\n",
493 OFFSET(ul_mapsiz),
494 ulwp.ul_mapsiz,
495 ulwp.ul_guardsize,
496 prt_addr((void *)ulwp.ul_stktop, 1),
497 ulwp.ul_stksiz);
498
499 HD("ustack.ss_sp ustack.ss_size ustack.ss_flags");
500 mdb_printf(OFFSTR "%s %-21ld %s\n",
501 OFFSET(ul_ustack.ss_sp),
502 prt_addr(ulwp.ul_ustack.ss_sp, 1),
503 ulwp.ul_ustack.ss_size,
504 stack_flags(&ulwp.ul_ustack));
505
506 HD("ix lwpid pri epri policy cid");
507 mdb_printf(OFFSTR "%-10d %-10d %-10d %-10d %-10d %d\n",
508 OFFSET(ul_ix),
509 ulwp.ul_ix,
510 ulwp.ul_lwpid,
511 ulwp.ul_pri,
512 ulwp.ul_epri,
513 ulwp.ul_policy,
514 ulwp.ul_cid);
515
516 HD("cursig pleasestop stop signalled dead unwind");
517 mdb_printf(OFFSTR "%-10d ",
518 OFFSET(ul_cursig),
519 ulwp.ul_cursig);
520 mdb_printf(ulwp.ul_pleasestop? "0x%-8x " : "%-10d ",
521 ulwp.ul_pleasestop);
522 mdb_printf(ulwp.ul_stop? "0x%-8x " : "%-10d ",
523 ulwp.ul_stop);
524 mdb_printf("%-10d %-10d %d\n",
525 ulwp.ul_signalled,
526 ulwp.ul_dead,
527 ulwp.ul_unwind);
528
529 HD("detached writer stopping can'prolog preempt savpreempt");
530 mdb_printf(OFFSTR "%-10d %-10d %-10d %-10d %-10d %d\n",
531 OFFSET(ul_detached),
532 ulwp.ul_detached,
533 ulwp.ul_writer,
534 ulwp.ul_stopping,
535 ulwp.ul_cancel_prologue,
536 ulwp.ul_preempt,
537 ulwp.ul_savpreempt);
538
539 HD("sigsuspend main fork primarymap m'spinners d'noreserv");
540 mdb_printf(OFFSTR "%-10d %-10d %-10d %-10d %-10d %d\n",
541 OFFSET(ul_sigsuspend),
542 ulwp.ul_sigsuspend,
543 ulwp.ul_main,
544 ulwp.ul_fork,
545 ulwp.ul_primarymap,
546 ulwp.ul_max_spinners,
547 ulwp.ul_door_noreserve);
548
549 HD("queue_fifo c'w'defer e'detect' async_safe rt rtqueued");
550 mdb_printf(OFFSTR "%-10d %-10d %-10d %-10d %-10d %d\n",
551 OFFSET(ul_queue_fifo),
552 ulwp.ul_queue_fifo,
553 ulwp.ul_cond_wait_defer,
554 ulwp.ul_error_detection,
555 ulwp.ul_async_safe,
556 ulwp.ul_rt,
557 ulwp.ul_rtqueued);
558
559 HD("misaligned adapt'spin queue_spin critical sigdefer vfork");
560 mdb_printf(OFFSTR "%-10d %-10d %-10d %-10d %-10d %d\n",
561 OFFSET(ul_misaligned),
562 ulwp.ul_misaligned,
563 ulwp.ul_adaptive_spin,
564 ulwp.ul_queue_spin,
565 ulwp.ul_critical,
566 ulwp.ul_sigdefer,
567 ulwp.ul_vfork);
568
569 HD("cancelable c'pending c'disabled c'async save_async mutator");
570 mdb_printf(OFFSTR "%-10d %-10d %-10d %-10d %-10d %d\n",
571 OFFSET(ul_cancelable),
572 ulwp.ul_cancelable,
573 ulwp.ul_cancel_pending,
574 ulwp.ul_cancel_disabled,
575 ulwp.ul_cancel_async,
576 ulwp.ul_save_async,
577 ulwp.ul_mutator);
578
579 HD("created replace nocancel errno errnop");
580 mdb_printf(OFFSTR "%-10d %-10d %-10d %-10d %s\n",
581 OFFSET(ul_created),
582 ulwp.ul_created,
583 ulwp.ul_replace,
584 ulwp.ul_nocancel,
585 ulwp.ul_errno,
586 prt_addr(ulwp.ul_errnop, 0));
587
588 HD("clnup_hdr schedctl_called schedctl");
589 mdb_printf(OFFSTR "%s %s %s\n",
590 OFFSET(ul_clnup_hdr),
591 prt_addr(ulwp.ul_clnup_hdr, 1),
592 prt_addr(ulwp.ul_schedctl_called, 1),
593 prt_addr((void *)ulwp.ul_schedctl, 0));
594
595 HD("bindflags libc_locks stsd &ftsd");
596 mdb_printf(OFFSTR,
597 OFFSET(ul_bindflags));
598 mdb_printf(ulwp.ul_bindflags? "0x%-8x " : "%-10d ",
599 ulwp.ul_bindflags);
600 mdb_printf("%-10d ", ulwp.ul_libc_locks);
601 mdb_printf("%s %s\n",
602 prt_addr(ulwp.ul_stsd, 1),
603 prt_addr((void *)(addr + OFFSET(ul_ftsd[0])), 0));
604
605 HD("eventmask[0..1] eventnum eventdata");
606 mdb_printf(OFFSTR "0x%08x 0x%08x %-21d %s\n",
607 OFFSET(ul_td_evbuf.eventmask.event_bits[0]),
608 ulwp.ul_td_evbuf.eventmask.event_bits[0],
609 ulwp.ul_td_evbuf.eventmask.event_bits[1],
610 ulwp.ul_td_evbuf.eventnum,
611 prt_addr(ulwp.ul_td_evbuf.eventdata, 0));
612
613 HD("td'enable sync'reg qtype cv_wake rtld usropts");
614 mdb_printf(OFFSTR "%-10d %-10d %-10d %-10d %-10d ",
615 OFFSET(ul_td_events_enable),
616 ulwp.ul_td_events_enable,
617 ulwp.ul_sync_obj_reg,
618 ulwp.ul_qtype,
619 ulwp.ul_cv_wake,
620 ulwp.ul_rtld);
621 mdb_printf(ulwp.ul_usropts? "0x%x\n" : "%d\n",
622 ulwp.ul_usropts);
623
624 HD("startpc startarg wchan");
625 mdb_printf(OFFSTR "%s %s %s\n",
626 OFFSET(ul_startpc),
627 prt_addr((void *)ulwp.ul_startpc, 1),
628 prt_addr(ulwp.ul_startarg, 1),
629 prt_addr(ulwp.ul_wchan, 0));
630
631 HD("link sleepq cvmutex");
632 mdb_printf(OFFSTR "%s %s %s\n",
633 OFFSET(ul_link),
634 prt_addr(ulwp.ul_link, 1),
635 prt_addr(ulwp.ul_sleepq, 1),
636 prt_addr(ulwp.ul_cvmutex, 0));
637
638 HD("mxchain save_state");
639 mdb_printf(OFFSTR "%s %d\n",
640 OFFSET(ul_mxchain),
641 prt_addr(ulwp.ul_mxchain, 1),
642 ulwp.ul_save_state);
643
644 HD("rdlockcnt rd_rwlock rd_count");
645 mdb_printf(OFFSTR "%-21d %s %d\n",
646 OFFSET(ul_rdlockcnt),
647 ulwp.ul_rdlockcnt,
648 prt_addr(ulwp.ul_readlock.single.rd_rwlock, 1),
649 ulwp.ul_readlock.single.rd_count);
650
651 HD("heldlockcnt heldlocks tpdp");
652 mdb_printf(OFFSTR "%-21d %s %s\n",
653 OFFSET(ul_heldlockcnt),
654 ulwp.ul_heldlockcnt,
655 prt_addr(ulwp.ul_heldlocks.single, 1),
656 prt_addr(ulwp.ul_tpdp, 0));
657
658 HD("siglink s'l'spin s'l'spin2 s'l'sleep s'l'wakeup");
659 mdb_printf(OFFSTR "%s %-10d %-10d %-10d %d\n",
660 OFFSET(ul_siglink),
661 prt_addr(ulwp.ul_siglink, 1),
662 ulwp.ul_spin_lock_spin,
663 ulwp.ul_spin_lock_spin2,
664 ulwp.ul_spin_lock_sleep,
665 ulwp.ul_spin_lock_wakeup);
666
667 HD("&queue_root rtclassid pilocks");
668 mdb_printf(OFFSTR "%s %-10d %d\n",
669 OFFSET(ul_queue_root),
670 prt_addr((void *)(addr + OFFSET(ul_queue_root)), 1),
671 ulwp.ul_rtclassid,
672 ulwp.ul_pilocks);
673
674 /*
675 * The remainder of the ulwp_t structure
676 * is invalid if this is a replacement.
677 */
678 if (ulwp.ul_replace)
679 return (DCMD_OK);
680
681 HD("sigmask[0..3]");
682 mdb_printf(OFFSTR "0x%08x 0x%08x 0x%08x 0x%08x\n",
683 OFFSET(ul_sigmask.__sigbits[0]),
684 ulwp.ul_sigmask.__sigbits[0],
685 ulwp.ul_sigmask.__sigbits[1],
686 ulwp.ul_sigmask.__sigbits[2],
687 ulwp.ul_sigmask.__sigbits[3]);
688
689 HD("tmpmask[0..3]");
690 mdb_printf(OFFSTR "0x%08x 0x%08x 0x%08x 0x%08x\n",
691 OFFSET(ul_tmpmask.__sigbits[0]),
692 ulwp.ul_tmpmask.__sigbits[0],
693 ulwp.ul_tmpmask.__sigbits[1],
694 ulwp.ul_tmpmask.__sigbits[2],
695 ulwp.ul_tmpmask.__sigbits[3]);
696
697 HD("&siginfo &spinlock &fpuenv");
698 mdb_printf(OFFSTR "%s %s %s\n",
699 OFFSET(ul_siginfo),
700 prt_addr((void *)(addr + OFFSET(ul_siginfo)), 1),
701 prt_addr((void *)(addr + OFFSET(ul_spinlock)), 1),
702 prt_addr((void *)(addr + OFFSET(ul_fpuenv)), 0));
703
704 HD("tmem.size &tmem.roots");
705 mdb_printf(OFFSTR "%-21H %s\n",
706 OFFSET(ul_tmem),
707 ulwp.ul_tmem.tm_size,
708 prt_addr((void *)(addr + OFFSET(ul_tmem) + sizeof (size_t)), 0));
709
710 return (DCMD_OK);
711 }
712
713 /*
714 * Get the address of the unique uberdata_t structure.
715 */
716 static uintptr_t
uberdata_addr(void)717 uberdata_addr(void)
718 {
719 uintptr_t uaddr;
720 uintptr_t addr;
721 GElf_Sym sym;
722
723 if (mdb_lookup_by_obj("libc.so.1", "_tdb_bootstrap", &sym) != 0) {
724 mdb_warn("cannot find libc.so.1`_tdb_bootstrap");
725 return (0);
726 }
727 if (mdb_vread(&addr, sizeof (addr), sym.st_value) == sizeof (addr) &&
728 addr != 0 &&
729 mdb_vread(&uaddr, sizeof (uaddr), addr) == sizeof (uaddr) &&
730 uaddr != 0) {
731 return (uaddr);
732 }
733 if (mdb_lookup_by_obj("libc.so.1", "_uberdata", &sym) != 0) {
734 mdb_warn("cannot find libc.so.1`_uberdata");
735 return (0);
736 }
737 return ((uintptr_t)sym.st_value);
738 }
739
740 #undef OFFSET
741 #define OFFSET(member) ((size_t)OFFSETOF(uberdata_t, member))
742
743 /*ARGSUSED*/
744 static int
d_uberdata(uintptr_t addr,uint_t flags,int argc,const mdb_arg_t * argv)745 d_uberdata(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
746 {
747 uberdata_t uberdata;
748 int i;
749
750 if (argc != 0)
751 return (DCMD_USAGE);
752 if (!(flags & DCMD_ADDRSPEC) && (addr = uberdata_addr()) == 0)
753 return (DCMD_ERR);
754
755 if (mdb_vread(&uberdata, sizeof (uberdata), addr) !=
756 sizeof (uberdata)) {
757 mdb_warn("failed to read uberdata at 0x%p", addr);
758 return (DCMD_ERR);
759 }
760
761 mdb_printf("%#a\n", addr);
762
763 HD("&link_lock &ld_lock &fork_lock");
764 mdb_printf(OFFSTR "%s %s %s\n",
765 OFFSET(link_lock),
766 prt_addr((void *)(addr + OFFSET(link_lock)), 1),
767 prt_addr((void *)(addr + OFFSET(ld_lock)), 1),
768 prt_addr((void *)(addr + OFFSET(fork_lock)), 0));
769
770 HD("&atfork_lock &callout_lock &tdb_hash_lock");
771 mdb_printf(OFFSTR "%s %s %s\n",
772 OFFSET(atfork_lock),
773 prt_addr((void *)(addr + OFFSET(atfork_lock)), 1),
774 prt_addr((void *)(addr + OFFSET(callout_lock)), 1),
775 prt_addr((void *)(addr + OFFSET(tdb_hash_lock)), 0));
776
777 HD("&tdb_hash_lock_stats &siguaction[0]");
778 mdb_printf(OFFSTR "%s %s\n",
779 OFFSET(tdb_hash_lock_stats),
780 prt_addr((void *)(addr + OFFSET(tdb_hash_lock_stats)), 1),
781 prt_addr((void *)(addr + OFFSET(siguaction)), 0));
782
783 HD("&bucket free_list chunks");
784 for (i = 0; i < NBUCKETS; i++) {
785 mdb_printf(OFFSTR "%s %s %ld\n",
786 OFFSET(bucket[i]),
787 prt_addr((void *)(addr + OFFSET(bucket[i])), 1),
788 prt_addr(uberdata.bucket[i].free_list, 1),
789 uberdata.bucket[i].chunks);
790 }
791
792 HD("&atexit_root head exit_frame_monitor");
793 mdb_printf(OFFSTR "%s %s %s\n",
794 OFFSET(atexit_root),
795 prt_addr((void *)(addr + OFFSET(atexit_root.exitfns_lock)), 1),
796 prt_addr(uberdata.atexit_root.head, 1),
797 prt_addr(uberdata.atexit_root.exit_frame_monitor, 0));
798
799 HD("&quickexit_root head");
800 mdb_printf(OFFSTR "%s %s\n",
801 OFFSET(quickexit_root),
802 prt_addr((void *)(addr + OFFSET(quickexit_root.exitfns_lock)), 1),
803 prt_addr(uberdata.quickexit_root.head, 0));
804
805
806 HD("&tsd_metadata tsdm_nkeys tsdm_nused tsdm_destro");
807 mdb_printf(OFFSTR "%s %-10d %-10d %s\n",
808 OFFSET(tsd_metadata),
809 prt_addr((void *)(addr + OFFSET(tsd_metadata.tsdm_lock)), 1),
810 uberdata.tsd_metadata.tsdm_nkeys,
811 uberdata.tsd_metadata.tsdm_nused,
812 prt_addr((void *)uberdata.tsd_metadata.tsdm_destro, 0));
813
814 HD("&tls_metadata tls_modinfo.data tls_modinfo.size");
815 mdb_printf(OFFSTR "%s %s %ld\n",
816 OFFSET(tls_metadata),
817 prt_addr((void *)(addr + OFFSET(tls_metadata.tls_lock)), 1),
818 prt_addr(uberdata.tls_metadata.tls_modinfo.tls_data, 1),
819 uberdata.tls_metadata.tls_modinfo.tls_size);
820
821 HD(" static_tls.data static_tls.size");
822 mdb_printf(OFFSTR "%s %s %ld\n",
823 OFFSET(tls_metadata.static_tls),
824 " ",
825 prt_addr(uberdata.tls_metadata.static_tls.tls_data, 1),
826 uberdata.tls_metadata.static_tls.tls_size);
827
828 HD("primary_ma bucket_ini uflags.mt uflags.pad uflags.trs uflags.ted");
829 mdb_printf(OFFSTR "%-10d %-10d %-10d %-10d %-10d %d\n",
830 OFFSET(primary_map),
831 uberdata.primary_map,
832 uberdata.bucket_init,
833 uberdata.uberflags.uf_x.x_mt,
834 uberdata.uberflags.uf_x.x_pad,
835 uberdata.uberflags.uf_x.x_tdb_register_sync,
836 uberdata.uberflags.uf_x.x_thread_error_detection);
837
838 HD("queue_head thr_hash_table hash_size hash_mask");
839 mdb_printf(OFFSTR "%s %s %-10d 0x%x\n",
840 OFFSET(queue_head),
841 prt_addr(uberdata.queue_head, 1),
842 prt_addr(uberdata.thr_hash_table, 1),
843 uberdata.hash_size,
844 uberdata.hash_mask);
845
846 HD("ulwp_one all_lwps all_zombies");
847 mdb_printf(OFFSTR "%s %s %s\n",
848 OFFSET(ulwp_one),
849 prt_addr(uberdata.ulwp_one, 1),
850 prt_addr(uberdata.all_lwps, 1),
851 prt_addr(uberdata.all_zombies, 0));
852
853 HD("nthreads nzombies ndaemons pid sigacthandler");
854 mdb_printf(OFFSTR "%-10d %-10d %-10d %-10d %s\n",
855 OFFSET(nthreads),
856 uberdata.nthreads,
857 uberdata.nzombies,
858 uberdata.ndaemons,
859 (int)uberdata.pid,
860 prt_addr((void *)uberdata.sigacthandler, 0));
861
862 HD("lwp_stacks lwp_laststack nfreestack stk_cache");
863 mdb_printf(OFFSTR "%s %s %-10d %d\n",
864 OFFSET(lwp_stacks),
865 prt_addr(uberdata.lwp_stacks, 1),
866 prt_addr(uberdata.lwp_laststack, 1),
867 uberdata.nfreestack,
868 uberdata.thread_stack_cache);
869
870 HD("ulwp_freelist ulwp_lastfree ulwp_replace_free");
871 mdb_printf(OFFSTR "%s %s %s\n",
872 OFFSET(ulwp_freelist),
873 prt_addr(uberdata.ulwp_freelist, 1),
874 prt_addr(uberdata.ulwp_lastfree, 1),
875 prt_addr(uberdata.ulwp_replace_free, 0));
876
877 HD("ulwp_replace_last atforklist");
878 mdb_printf(OFFSTR "%s %s\n",
879 OFFSET(ulwp_replace_last),
880 prt_addr(uberdata.ulwp_replace_last, 1),
881 prt_addr(uberdata.atforklist, 0));
882
883 HD("robustlocks robustlist progname");
884 mdb_printf(OFFSTR "%s %s %s\n",
885 OFFSET(robustlocks),
886 prt_addr(uberdata.robustlocks, 1),
887 prt_addr(uberdata.robustlist, 1),
888 prt_addr(uberdata.progname, 0));
889
890 HD("tdb_bootstrap tdb_sync_addr_hash tdb_'count tdb_'fail");
891 mdb_printf(OFFSTR "%s %s %-10d %d\n",
892 OFFSET(tdb_bootstrap),
893 prt_addr(uberdata.tdb_bootstrap, 1),
894 prt_addr(uberdata.tdb.tdb_sync_addr_hash, 1),
895 uberdata.tdb.tdb_register_count,
896 uberdata.tdb.tdb_hash_alloc_failed);
897
898 HD("tdb_sync_addr_free tdb_sync_addr_last tdb_sync_alloc");
899 mdb_printf(OFFSTR "%s %s %ld\n",
900 OFFSET(tdb.tdb_sync_addr_free),
901 prt_addr(uberdata.tdb.tdb_sync_addr_free, 1),
902 prt_addr(uberdata.tdb.tdb_sync_addr_last, 1),
903 uberdata.tdb.tdb_sync_alloc);
904
905 HD("tdb_ev_global_mask tdb_events");
906 mdb_printf(OFFSTR "0x%08x 0x%08x %s\n",
907 OFFSET(tdb.tdb_ev_global_mask),
908 uberdata.tdb.tdb_ev_global_mask.event_bits[0],
909 uberdata.tdb.tdb_ev_global_mask.event_bits[1],
910 prt_addr((void *)uberdata.tdb.tdb_events, 0));
911
912 return (DCMD_OK);
913 }
914
915 static int
ulwp_walk_init(mdb_walk_state_t * wsp)916 ulwp_walk_init(mdb_walk_state_t *wsp)
917 {
918 uintptr_t addr = wsp->walk_addr;
919 uintptr_t uber_addr;
920 int offset;
921
922 offset = mdb_ctf_offsetof_by_name("uberdata_t", "all_lwps");
923 if (offset == -1) {
924 offset = OFFSETOF(uberdata_t, all_lwps);
925 mdb_warn("CTF data is missing for uberdata_t; using current "
926 "platform's offset for uberdata.all_lwps");
927 }
928
929 if (addr == 0 &&
930 ((uber_addr = uberdata_addr()) == 0 ||
931 mdb_vread(&addr, sizeof (addr), uber_addr + offset)
932 != sizeof (addr))) {
933 mdb_warn("cannot find 'uberdata.all_lwps'");
934 return (WALK_ERR);
935 }
936 if (addr == 0)
937 return (WALK_DONE);
938 wsp->walk_addr = addr;
939 wsp->walk_data = (void *)addr;
940 return (WALK_NEXT);
941 }
942
943 static int
ulwp_walk_step(mdb_walk_state_t * wsp)944 ulwp_walk_step(mdb_walk_state_t *wsp)
945 {
946 uintptr_t addr = wsp->walk_addr;
947 ulwp_t ulwp;
948
949 if (addr == 0)
950 return (WALK_DONE);
951 if (mdb_vread(&ulwp, sizeof (ulwp), addr) != sizeof (ulwp) &&
952 (bzero(&ulwp, sizeof (ulwp)),
953 mdb_vread(&ulwp, REPLACEMENT_SIZE, addr)) != REPLACEMENT_SIZE) {
954 mdb_warn("failed to read ulwp at 0x%p", addr);
955 return (WALK_ERR);
956 }
957 /*
958 * If we have looped around to the beginning
959 * of the circular linked list, we are done.
960 */
961 if ((wsp->walk_addr = (uintptr_t)ulwp.ul_forw)
962 == (uintptr_t)wsp->walk_data)
963 wsp->walk_addr = 0;
964 return (wsp->walk_callback(addr, &ulwp, wsp->walk_cbdata));
965 }
966
967 typedef struct lwp_wchan {
968 uint8_t wchan_flag[4];
969 uint16_t wchan_type;
970 uint16_t wchan_magic;
971 } lwp_wchan_t;
972
973 static int
wchan_walk_init(mdb_walk_state_t * wsp)974 wchan_walk_init(mdb_walk_state_t *wsp)
975 {
976 if (wsp->walk_addr != 0) {
977 mdb_warn("wchan walk only supports global walks");
978 return (WALK_ERR);
979 }
980
981 if (mdb_layered_walk("ulwp", wsp) == -1) {
982 mdb_warn("couldn't walk ulwp");
983 return (WALK_ERR);
984 }
985
986 return (WALK_NEXT);
987 }
988
989 static int
wchan_walk_step(mdb_walk_state_t * wsp)990 wchan_walk_step(mdb_walk_state_t *wsp)
991 {
992 uintptr_t addr = (uintptr_t)(((ulwp_t *)wsp->walk_layer)->ul_wchan);
993 lwp_wchan_t wchan;
994
995 if (addr == (uintptr_t)NULL) {
996 return (WALK_NEXT);
997 }
998
999 if (mdb_vread(&wchan, sizeof (wchan), addr) != sizeof (wchan)) {
1000 mdb_warn("failed to read wchan at 0x%p", addr);
1001 return (WALK_ERR);
1002 }
1003
1004 return (wsp->walk_callback(addr, &wchan, wsp->walk_cbdata));
1005 }
1006
1007 /* Avoid classifying NULL pointers as part of the main stack on x86 */
1008 #define MIN_STACK_ADDR (0x10000ul)
1009
1010 static int
whatis_walk_ulwp(uintptr_t addr,const ulwp_t * ulwp,mdb_whatis_t * w)1011 whatis_walk_ulwp(uintptr_t addr, const ulwp_t *ulwp, mdb_whatis_t *w)
1012 {
1013 uintptr_t cur;
1014 lwpid_t id = ulwp->ul_lwpid;
1015 uintptr_t top, base, size;
1016
1017 while (mdb_whatis_match(w, addr, sizeof (ulwp_t), &cur))
1018 mdb_whatis_report_object(w, cur, addr,
1019 "allocated as thread %#r's ulwp_t\n", id);
1020
1021 top = (uintptr_t)ulwp->ul_stktop;
1022 size = ulwp->ul_stksiz;
1023
1024 /*
1025 * The main stack ends up being a little weird, especially if
1026 * the stack ulimit is unlimited. This tries to take that into
1027 * account.
1028 */
1029 if (size > top)
1030 size = top;
1031 if (top > MIN_STACK_ADDR && top - size < MIN_STACK_ADDR)
1032 size = top - MIN_STACK_ADDR;
1033
1034 base = top - size;
1035
1036 while (mdb_whatis_match(w, base, size, &cur))
1037 mdb_whatis_report_address(w, cur, "in [ stack tid=%#r ]\n", id);
1038
1039 if (ulwp->ul_ustack.ss_flags & SS_ONSTACK) {
1040 base = (uintptr_t)ulwp->ul_ustack.ss_sp;
1041 size = ulwp->ul_ustack.ss_size;
1042
1043 while (mdb_whatis_match(w, base, size, &cur))
1044 mdb_whatis_report_address(w, cur,
1045 "in [ altstack tid=%#r ]\n", id);
1046 }
1047
1048 return (WHATIS_WALKRET(w));
1049 }
1050
1051 /*ARGSUSED*/
1052 static int
whatis_run_ulwps(mdb_whatis_t * w,void * arg)1053 whatis_run_ulwps(mdb_whatis_t *w, void *arg)
1054 {
1055 if (mdb_walk("ulwps", (mdb_walk_cb_t)whatis_walk_ulwp, w) == -1) {
1056 mdb_warn("couldn't find ulwps walker");
1057 return (1);
1058 }
1059 return (0);
1060 }
1061
1062 /*
1063 * =======================================================
1064 * End of thread (previously libthread) interfaces.
1065 * ==================== threads ==========================
1066 */
1067
1068 int
stacks_dcmd(uintptr_t addr,uint_t flags,int argc,const mdb_arg_t * argv)1069 stacks_dcmd(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
1070 {
1071 int rval = stacks(addr, flags, argc, argv);
1072
1073 /*
1074 * For the user-level variant of ::stacks, we don't bother caching
1075 * state, as even a very large program is unlikely to compare to the
1076 * kernel in terms of number of threads. (And if you find yourself
1077 * here in anger, frustrated about how long ::stacks is running on
1078 * your galactically complicated zillion-thread program, hopefully
1079 * you will find some solace in the irony. Okay, probably not...)
1080 */
1081 stacks_cleanup(B_TRUE);
1082 return (rval);
1083 }
1084
1085 typedef struct tid2ulwp_walk {
1086 lwpid_t t2u_tid;
1087 uintptr_t t2u_lwp;
1088 boolean_t t2u_found;
1089 } tid2ulwp_walk_t;
1090
1091 /*ARGSUSED*/
1092 static int
tid2ulwp_walk(uintptr_t addr,ulwp_t * ulwp,tid2ulwp_walk_t * t2u)1093 tid2ulwp_walk(uintptr_t addr, ulwp_t *ulwp, tid2ulwp_walk_t *t2u)
1094 {
1095 if (ulwp->ul_lwpid == t2u->t2u_tid) {
1096 t2u->t2u_lwp = addr;
1097 t2u->t2u_found = B_TRUE;
1098 return (WALK_DONE);
1099 }
1100
1101 return (WALK_NEXT);
1102 }
1103
1104 static int
tid2ulwp_impl(uintptr_t tid_addr,uintptr_t * ulwp_addrp)1105 tid2ulwp_impl(uintptr_t tid_addr, uintptr_t *ulwp_addrp)
1106 {
1107 tid2ulwp_walk_t t2u;
1108
1109 bzero(&t2u, sizeof (t2u));
1110 t2u.t2u_tid = (lwpid_t)tid_addr;
1111
1112 if (mdb_walk("ulwp", (mdb_walk_cb_t)tid2ulwp_walk, &t2u) != 0) {
1113 mdb_warn("can't walk 'ulwp'");
1114 return (DCMD_ERR);
1115 }
1116
1117 if (!t2u.t2u_found) {
1118 mdb_warn("thread ID %d not found", t2u.t2u_tid);
1119 return (DCMD_ERR);
1120 }
1121 *ulwp_addrp = t2u.t2u_lwp;
1122 return (DCMD_OK);
1123 }
1124
1125 /*ARGSUSED*/
1126 static int
tid2ulwp(uintptr_t addr,uint_t flags,int argc,const mdb_arg_t * argv)1127 tid2ulwp(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
1128 {
1129 uintptr_t ulwp_addr;
1130 int error;
1131
1132 if (argc != 0)
1133 return (DCMD_USAGE);
1134
1135 error = tid2ulwp_impl(addr, &ulwp_addr);
1136 if (error == DCMD_OK)
1137 mdb_printf("%p\n", ulwp_addr);
1138 return (error);
1139 }
1140
1141 /*
1142 * This is used by both d_tsd and d_errno, and contains the sum of all
1143 * members used by both commands.
1144 */
1145 typedef struct mdb_libc_ulwp {
1146 void *ul_ftsd[TSD_NFAST];
1147 tsd_t *ul_stsd;
1148 int *ul_errnop;
1149 } mdb_libc_ulwp_t;
1150
1151 /*
1152 * Map from thread pointer to tsd for given key
1153 */
1154 static int
d_tsd(uintptr_t addr,uint_t flags,int argc,const mdb_arg_t * argv)1155 d_tsd(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
1156 {
1157 mdb_libc_ulwp_t u;
1158 uintptr_t ulwp_addr;
1159 uintptr_t key = 0;
1160 void *element = NULL;
1161
1162 if (mdb_getopts(argc, argv, 'k', MDB_OPT_UINTPTR, &key, NULL) != argc)
1163 return (DCMD_USAGE);
1164
1165 if (!(flags & DCMD_ADDRSPEC) || key == 0)
1166 return (DCMD_USAGE);
1167
1168 if (tid2ulwp_impl(addr, &ulwp_addr) != DCMD_OK)
1169 return (DCMD_ERR);
1170
1171 if (mdb_ctf_vread(&u, "ulwp_t", "mdb_libc_ulwp_t", ulwp_addr, 0) == -1)
1172 return (DCMD_ERR);
1173
1174 if (key < TSD_NFAST) {
1175 element = u.ul_ftsd[key];
1176 } else if (u.ul_stsd != NULL) {
1177 uint_t nalloc;
1178 /* tsd_t is a union, so we can't use ctf_vread() on it. */
1179 if (mdb_vread(&nalloc, sizeof (nalloc),
1180 (uintptr_t)&u.ul_stsd->tsd_nalloc) == -1) {
1181 mdb_warn("failed to read tsd_t at %p", u.ul_stsd);
1182 return (DCMD_ERR);
1183 }
1184 if (key < nalloc) {
1185 if (mdb_vread(&element, sizeof (element),
1186 (uintptr_t)&u.ul_stsd->tsd_data[key]) == -1) {
1187 mdb_warn("failed to read tsd_t at %p",
1188 u.ul_stsd);
1189 return (DCMD_ERR);
1190 }
1191 }
1192 }
1193
1194 if (element == NULL && (flags & DCMD_PIPE))
1195 return (DCMD_OK);
1196
1197 mdb_printf("%p\n", element);
1198 return (DCMD_OK);
1199 }
1200
1201 /*
1202 * Print percent from 16-bit binary fraction [0 .. 1]
1203 * Round up .01 to .1 to indicate some small percentage (the 0x7000 below).
1204 *
1205 * Note: This routine was copied from elfdump/common/corenote.c and modified.
1206 *
1207 */
1208 static uint_t
pct_value(ushort_t pct)1209 pct_value(ushort_t pct)
1210 {
1211 uint_t value = pct;
1212
1213 value = ((value * 1000) + 0x7000) >> 15; /* [0 .. 1000] */
1214 if (value >= 1000)
1215 value = 999;
1216
1217 return (value);
1218 }
1219
1220 static void
psinfo_raw(psinfo_t psinfo)1221 psinfo_raw(psinfo_t psinfo)
1222 {
1223 const int minspaces = 2;
1224 const int spbcols = 20;
1225 char sysname[SYS2STR_MAX];
1226 uint_t cpu, mem;
1227 char buff[32];
1228 int bufflen;
1229
1230 mdb_printf("[ NT_PRPSINFO ]\n");
1231
1232 mdb_printf("\tpr_state: %d\t\t\tpr_sname: %c\n",
1233 psinfo.pr_lwp.pr_state, psinfo.pr_lwp.pr_sname);
1234
1235 mdb_printf("\tpr_zomb: %d\t\t\tpr_nice: %d\n",
1236 psinfo.pr_nzomb, psinfo.pr_lwp.pr_nice);
1237
1238 mdb_printf("\tpr_uid: %u\t\t\tpr_gid: %u\n",
1239 psinfo.pr_uid, psinfo.pr_gid);
1240
1241 mdb_snprintf(buff, sizeof (buff),
1242 "%d", psinfo.pr_pid);
1243
1244 bufflen = strlen(buff);
1245 mdb_printf("\tpr_pid: %s%*spr_ppid: %d\n",
1246 buff, strlen(buff) > spbcols ? minspaces : (spbcols - bufflen), " ",
1247 psinfo.pr_ppid);
1248
1249 mdb_printf("\tpr_pgid: %u\t\t\tpr_sid: %d\n",
1250 psinfo.pr_gid, psinfo.pr_sid);
1251
1252 mdb_snprintf(buff, sizeof (buff),
1253 "0x%lx", (ulong_t)psinfo.pr_addr);
1254
1255 bufflen = strlen(buff);
1256
1257 mdb_printf("\tpr_addr: %s%*spr_size: %#x\n",
1258 buff, strlen(buff) > spbcols ? minspaces : (spbcols - bufflen), " ",
1259 (ulong_t)psinfo.pr_size);
1260
1261 mdb_printf("\tpr_rssize: %#lx\t\tpr_wchan: %#lx\n",
1262 (ulong_t)psinfo.pr_rssize, (ulong_t)psinfo.pr_lwp.pr_wchan);
1263
1264 mdb_printf("\tpr_start:\n\t tv_sec: %ld\t\ttv_nsec: %ld\n",
1265 psinfo.pr_start.tv_sec, psinfo.pr_start.tv_nsec);
1266
1267 mdb_printf("\tpr_time:\n\t tv_sec: %ld\t\t\ttv_nsec: %ld\n",
1268 psinfo.pr_time.tv_sec, psinfo.pr_time.tv_nsec);
1269
1270 mdb_printf("\tpr_pri: %d\t\t\tpr_oldpri: %d\n",
1271 psinfo.pr_lwp.pr_pri, psinfo.pr_lwp.pr_oldpri);
1272
1273 mdb_printf("\tpr_cpu: %d\n", psinfo.pr_lwp.pr_cpu);
1274
1275 mdb_printf("\tpr_clname: %s\n", psinfo.pr_lwp.pr_clname);
1276
1277 mdb_printf("\tpr_fname: %s\n", psinfo.pr_fname);
1278
1279 mdb_printf("\tpr_psargs: %s\n", psinfo.pr_psargs);
1280
1281
1282 mdb_printf("\tpr_syscall: [ %s ]\n",
1283 proc_sysname(psinfo.pr_lwp.pr_syscall, sysname,
1284 sizeof (sysname)));
1285
1286 mdb_printf("\tpr_ctime:\n\t tv_sec: %ld\t\t\ttv_nsec: %ld\n",
1287 psinfo.pr_ctime.tv_sec, psinfo.pr_ctime.tv_nsec);
1288
1289 mdb_printf("\tpr_argc: %d\t\t\tpr_argv: 0x%lx\n",
1290 psinfo.pr_argc, (ulong_t)psinfo.pr_argv);
1291
1292 mdb_snprintf(buff, sizeof (buff), "0x%lx", (ulong_t)psinfo.pr_envp);
1293
1294 bufflen = strlen(buff);
1295
1296 mdb_printf("\tpr_envp: %s%*spr_wstat: %d\n",
1297 buff, strlen(buff) > spbcols ? minspaces : (spbcols - bufflen), " ",
1298 psinfo.pr_wstat);
1299
1300 cpu = pct_value(psinfo.pr_pctcpu);
1301 mem = pct_value(psinfo.pr_pctmem);
1302
1303 mdb_printf("\tpr_pctcpu: %u.%u%%\t\tpr_pctmem: %u.%u%%\n",
1304 cpu / 10, cpu % 10, mem / 10, mem % 10);
1305
1306 mdb_printf("\tpr_euid: %u\t\t\tpr_egid: %u\n",
1307 psinfo.pr_euid, psinfo.pr_egid);
1308
1309 mdb_printf("\tpr_dmodel: [%s]\n",
1310 proc_dmodelname(psinfo.pr_dmodel, buff, sizeof (buff)));
1311 }
1312
1313 static void
psinfo_sum(psinfo_t psinfo)1314 psinfo_sum(psinfo_t psinfo)
1315 {
1316 const int minspaces = 2;
1317 const int spbcols = 23;
1318 char buff[64];
1319 int bufflen;
1320 int ms;
1321
1322 mdb_printf("PID: %6d (process id)\t\t"
1323 "UID: %4u (real user id)\n",
1324 psinfo.pr_pid, psinfo.pr_uid);
1325
1326 mdb_printf("PPID: %6d (parent process id)\tEUID: %4d"
1327 " (effective user id)\n", psinfo.pr_ppid, psinfo.pr_euid);
1328
1329 mdb_printf("PGID: %6d (process group id)\tGID: %4u"
1330 " (real group id)\n", psinfo.pr_pgid, psinfo.pr_gid);
1331
1332 mdb_printf("SID: %6d (session id)\t\tEGID: %4u"
1333 " (effective group id)\n",
1334 psinfo.pr_sid, psinfo.pr_egid);
1335
1336 mdb_printf("ZONEID: %6d\t\t\t\tCONTRACT:%4d\n",
1337 psinfo.pr_zoneid, psinfo.pr_contract);
1338
1339 mdb_printf("PROJECT:%6d \t\t\t\tTASK: %4d\n\n",
1340 psinfo.pr_projid, psinfo.pr_taskid);
1341
1342 mdb_printf("START: %Y (wall timestamp when the process started)\n",
1343 psinfo.pr_start);
1344
1345 ms = NSEC2MSEC(psinfo.pr_time.tv_nsec);
1346
1347 mdb_snprintf(buff, sizeof (buff), "%ld.%d seconds",
1348 psinfo.pr_time.tv_sec, ms);
1349
1350 bufflen = strlen(buff);
1351
1352 mdb_printf("TIME: %s%*s"
1353 "(CPU time used by this process)\n",
1354 buff, bufflen > spbcols ? minspaces : (spbcols - bufflen), " ");
1355
1356 ms = NSEC2MSEC(psinfo.pr_ctime.tv_nsec);
1357
1358 mdb_snprintf(buff, sizeof (buff), "%ld.%d seconds",
1359 psinfo.pr_ctime.tv_sec, ms);
1360
1361 mdb_printf("CTIME: %s%*s"
1362 "(CPU time used by child processes)\n",
1363 buff, bufflen > spbcols ? minspaces : (spbcols - bufflen), " ");
1364
1365 mdb_snprintf(buff, sizeof (buff), "%s", psinfo.pr_fname);
1366 bufflen = strlen(buff);
1367
1368 mdb_printf("FNAME: %s%*s(name of the program executed)\n",
1369 buff, bufflen > spbcols ? minspaces : (spbcols - bufflen), " ");
1370
1371 mdb_printf("PSARGS: \"%s\"\n", psinfo.pr_psargs);
1372 }
1373
1374 void
d_psinfo_dcmd_help(void)1375 d_psinfo_dcmd_help(void)
1376 {
1377 mdb_printf(
1378 "Prints relevant fields from psinfo_t data and\n"
1379 "most fields from NT_PRPSINFO note section\n\n"
1380 "Usage: ::psinfo [-v]\n"
1381 "Options:\n"
1382 " -v verbose output\n");
1383 }
1384
1385 static int
d_psinfo(uintptr_t addr,uint_t flags,int argc,const mdb_arg_t * argv)1386 d_psinfo(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
1387 {
1388 psinfo_t psinfo;
1389 uint_t opt_v = FALSE;
1390 ssize_t nbytes;
1391
1392 if (mdb_getopts(argc, argv, 'v',
1393 MDB_OPT_SETBITS, TRUE, &opt_v, NULL) != argc)
1394 return (DCMD_USAGE);
1395
1396 nbytes = mdb_get_xdata("psinfo", NULL, 0);
1397
1398 if (nbytes <= 0) {
1399 mdb_warn("information not available for analysis");
1400 return (DCMD_ERR);
1401 }
1402
1403 if (mdb_get_xdata("psinfo", &psinfo, nbytes) != nbytes) {
1404 mdb_warn("failed to read psinfo information");
1405 return (DCMD_ERR);
1406 }
1407
1408 if (opt_v) {
1409 psinfo_raw(psinfo);
1410 } else {
1411 psinfo_sum(psinfo);
1412 }
1413
1414 return (DCMD_OK);
1415 }
1416
1417 typedef struct d_mutex_output {
1418 char *mo_output;
1419 struct d_mutex_output *mo_next;
1420 } d_mutex_output_t;
1421
1422 static void
d_mutex_output_push(d_mutex_output_t ** head,const char * out)1423 d_mutex_output_push(d_mutex_output_t **head, const char *out)
1424 {
1425 d_mutex_output_t *new;
1426 size_t len = strlen(out) + 1;
1427
1428 new = mdb_alloc(sizeof (d_mutex_output_t), UM_SLEEP | UM_GC);
1429 new->mo_next = *head;
1430 new->mo_output = mdb_alloc(len, UM_SLEEP | UM_GC);
1431 bcopy(out, new->mo_output, len);
1432
1433 *head = new;
1434 }
1435
1436 void
d_mutex_output_reverse(d_mutex_output_t ** head)1437 d_mutex_output_reverse(d_mutex_output_t **head)
1438 {
1439 d_mutex_output_t *current, *next, *last = NULL;
1440
1441 for (current = *head; current != NULL; current = next) {
1442 next = current->mo_next;
1443 current->mo_next = last;
1444 last = current;
1445
1446 if (next == NULL) {
1447 break;
1448 }
1449 }
1450
1451 *head = current;
1452 }
1453
1454 typedef struct d_mutex_walkdata {
1455 uintptr_t mow_target;
1456 d_mutex_output_t *mow_output;
1457 } d_mutex_walkdata_t;
1458
1459 int
d_mutex_walk(uintptr_t addr,const ulwp_t * ulwp,d_mutex_walkdata_t * wd)1460 d_mutex_walk(uintptr_t addr, const ulwp_t *ulwp, d_mutex_walkdata_t *wd)
1461 {
1462 char buf[256];
1463
1464 if ((uintptr_t)ulwp->ul_wchan != wd->mow_target)
1465 return (WALK_NEXT);
1466
1467 if (mdb_thread_name(ulwp->ul_lwpid, buf, sizeof (buf)) != 0) {
1468 mdb_snprintf(buf, sizeof (buf), "0x%p", addr);
1469 }
1470
1471 d_mutex_output_push(&wd->mow_output, buf);
1472 return (WALK_NEXT);
1473 }
1474
1475 static void
d_mutex_help(void)1476 d_mutex_help(void)
1477 {
1478 mdb_printf("%s\n",
1479 "Dump a mutex, optionally decoding flags and displaying waiters.\n");
1480 mdb_dec_indent(2);
1481 mdb_printf("%<b>OPTIONS%</b>\n");
1482 mdb_inc_indent(2);
1483 mdb_printf("%s",
1484 " -v Dump verbosely, decoding type and flags and showing waiters\n"
1485 " -f force printing as a mutex, even if it doesn't appear to be one\n");
1486 }
1487
1488 static int
d_mutex(uintptr_t addr,uint_t flags,int argc,const mdb_arg_t * argv)1489 d_mutex(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
1490 {
1491 lwp_mutex_t mutex;
1492 uintptr_t owner;
1493 char buf[256];
1494 uint_t opt_v = FALSE, opt_f = FALSE, warn;
1495 d_mutex_walkdata_t wd;
1496 d_mutex_output_t *toutput = NULL, *foutput = NULL;
1497 size_t i;
1498
1499
1500 if (!(flags & DCMD_ADDRSPEC))
1501 return (DCMD_USAGE);
1502
1503 if (mdb_getopts(argc, argv,
1504 'v', MDB_OPT_SETBITS, TRUE, &opt_v,
1505 'f', MDB_OPT_SETBITS, TRUE, &opt_f,
1506 NULL) != argc) {
1507 return (DCMD_USAGE);
1508 }
1509
1510 if (DCMD_HDRSPEC(flags)) {
1511 mdb_printf("%-16s %4s %4s %4s %s\n",
1512 "ADDR", "TYPE", "FLAG", "WTRS", "OWNER");
1513 }
1514
1515 /*
1516 * If we aren't in a loop or a pipe, we will warn explicitly when
1517 * we can't make sense of a mutex.
1518 */
1519 warn = (flags & (DCMD_LOOP | DCMD_PIPE)) ? FALSE : TRUE;
1520
1521 if (mdb_vread(&mutex, sizeof (mutex), addr) != sizeof (mutex)) {
1522 if (warn)
1523 mdb_warn("failed to read mutex at 0x%p", addr);
1524
1525 return (DCMD_ERR);
1526 }
1527
1528 /*
1529 * It's legal to have a zero'd mutex_t in BSS -- so we can only
1530 * rely on the magic to disambiguate a mutex if it is non-zero.
1531 */
1532 if (!opt_f && mutex.flags.magic != 0 &&
1533 mutex.flags.magic != MUTEX_MAGIC) {
1534 if (!warn)
1535 return (DCMD_ERR);
1536
1537 if (mutex.flags.magic == COND_MAGIC) {
1538 mdb_warn("0x%p is not a mutex (appears to be a "
1539 "condition variable)\n", addr);
1540 } else if (mutex.flags.magic == SEMA_MAGIC) {
1541 mdb_warn("0x%p is not a mutex (appears to be a "
1542 "semaphore)\n", addr);
1543 } else if (mutex.flags.magic == RWL_MAGIC) {
1544 mdb_warn("0x%p is not a mutex (appears to be a "
1545 "readers/writer lock)\n", addr);
1546 } else {
1547 mdb_warn("0x%p does not appear to be a mutex (expected "
1548 "0x%x, found 0x%x)\n", addr, MUTEX_MAGIC,
1549 mutex.flags.magic);
1550 }
1551
1552 return (DCMD_ERR);
1553 }
1554
1555 if (!opt_f) {
1556 /*
1557 * Sanity check that if we have an owner, it at least isn't
1558 * obviously not a ulwp_t.
1559 */
1560 uintptr_t owner = mutex.mutex_owner;
1561 ulwp_t u;
1562
1563 if (owner == (uintptr_t)NULL) {
1564 if (mutex.mutex_waiters) {
1565 if (!warn)
1566 return (DCMD_ERR);
1567
1568 mdb_warn("0x%p does not appear to be a mutex "
1569 "(waiters, but no owner?)\n", addr);
1570
1571 return (DCMD_ERR);
1572 }
1573 } else if (mdb_vread(&u, sizeof (u), owner) != sizeof (u) ||
1574 (uintptr_t)u.ul_self != owner) {
1575 if (!warn)
1576 return (DCMD_ERR);
1577
1578 mdb_warn("0x%p does not appear to be mutex "
1579 "(owner 0x%p does not appear to be a ulwp_t)\n",
1580 addr, owner);
1581
1582 return (DCMD_ERR);
1583 }
1584 }
1585
1586 mdb_printf("%-16p %4x %4x %4s ", addr, mutex.mutex_type,
1587 mutex.mutex_flag,
1588 mutex.mutex_waiters ? "yes" : "no");
1589
1590 if ((owner = mutex.mutex_owner) == (uintptr_t)NULL) {
1591 mdb_printf("-\n");
1592 } else {
1593 ulwp_t u;
1594
1595 if (mdb_vread(&u, sizeof (u), owner) != sizeof (u) ||
1596 mdb_thread_name(u.ul_lwpid, buf, sizeof (buf)) != 0) {
1597 mdb_snprintf(buf, sizeof (buf), "%d", u.ul_lwpid);
1598 }
1599
1600 mdb_printf("%p %s\n", owner, buf);
1601 }
1602
1603 if (!opt_v)
1604 return (DCMD_OK);
1605
1606 static struct {
1607 int val;
1608 char *str;
1609 } tvals[] = {
1610 { 0x01, "LOCK_SHARED" },
1611 { 0x02, "LOCK_ERRORCHECK" },
1612 { 0x04, "LOCK_RECURSIVE" },
1613 { 0x10, "LOCK_PRIO_INHERIT" },
1614 { 0x20, "LOCK_PRIO_PROTECT" },
1615 { 0x40, "LOCK_ROBUST" },
1616 /*
1617 * This is a defunct type, but an ancient (or corrupt) mutex
1618 * might have it set; indicate it if we see it.
1619 */
1620 { 0x08, "PROCESS_ROBUST" },
1621 { 0, "" }
1622 };
1623
1624 if (!(mutex.mutex_type & LOCK_SHARED)) {
1625 d_mutex_output_push(&toutput, "LOCK_NORMAL");
1626 }
1627
1628 for (i = 0; tvals[i].val != 0; i++) {
1629 if ((mutex.mutex_type & tvals[i].val) != 0) {
1630 d_mutex_output_push(&toutput, tvals[i].str);
1631 }
1632 }
1633
1634 static struct {
1635 int val;
1636 char *str;
1637 } fvals[] = {
1638 { 0x1, "LOCK_OWNERDEAD" },
1639 { 0x2, "LOCK_NOTRECOVERABLE" },
1640 { 0x4, "LOCK_INITED" },
1641 { 0x8, "LOCK_UNMAPPED" },
1642 { 0x10, "LOCK_DEADLOCK" },
1643 { 0, "" },
1644 };
1645
1646 for (i = 0; fvals[i].val != 0; i++) {
1647 if ((mutex.mutex_flag & fvals[i].val) != 0) {
1648 d_mutex_output_push(&foutput, fvals[i].str);
1649 }
1650 }
1651
1652 wd.mow_target = addr;
1653 wd.mow_output = NULL;
1654
1655 if (mdb_walk("ulwp", (mdb_walk_cb_t)d_mutex_walk, &wd) != 0) {
1656 mdb_warn("can't walk \"ulwp\"");
1657 return (DCMD_ERR);
1658 }
1659
1660 d_mutex_output_t *ooutput = wd.mow_output;
1661 d_mutex_output_reverse(&toutput);
1662 d_mutex_output_reverse(&foutput);
1663 d_mutex_output_reverse(&ooutput);
1664
1665 d_mutex_output_t *thead = toutput;
1666 d_mutex_output_t *fhead = foutput;
1667 d_mutex_output_t *ohead = ooutput;
1668
1669 mdb_printf("%21s", toutput != NULL ? "|" : "");
1670 mdb_printf("%5s", foutput != NULL ? "|" : "");
1671 mdb_printf("%3s\n", ooutput != NULL ? "|" : "");
1672
1673 boolean_t needblank = ooutput != NULL;
1674
1675 while (toutput != NULL || foutput != NULL || ooutput != NULL) {
1676 if (toutput != NULL) {
1677 mdb_printf("%17s %s", toutput->mo_output,
1678 toutput == thead ? "<-+" : " ");
1679 toutput = toutput->mo_next;
1680 } else {
1681 mdb_printf("%21s", "");
1682 }
1683
1684 if (foutput != NULL) {
1685 if (ooutput != NULL) {
1686 mdb_printf("%5s", "|");
1687 } else {
1688 if (needblank) {
1689 mdb_printf("%5s", "|");
1690 needblank = B_FALSE;
1691 } else {
1692 mdb_printf("%7s %s",
1693 foutput == fhead ? "+->" : "",
1694 foutput->mo_output);
1695 foutput = foutput->mo_next;
1696 }
1697 }
1698 } else {
1699 mdb_printf("%5s", "");
1700 }
1701
1702 if (ooutput != NULL) {
1703 mdb_printf("%5s %s",
1704 ooutput == ohead ? "+->" : "", ooutput->mo_output);
1705 ooutput = ooutput->mo_next;
1706 }
1707
1708 mdb_printf("\n");
1709 }
1710
1711 return (DCMD_OK);
1712 }
1713
1714 static int
d_errno(uintptr_t addr,uint_t flags,int argc,const mdb_arg_t * argv)1715 d_errno(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
1716 {
1717 mdb_libc_ulwp_t u;
1718 uintptr_t ulwp_addr;
1719 int error, errval;
1720
1721 if (argc != 0 || (flags & DCMD_ADDRSPEC) == 0)
1722 return (DCMD_USAGE);
1723
1724 error = tid2ulwp_impl(addr, &ulwp_addr);
1725 if (error != DCMD_OK)
1726 return (error);
1727
1728 /*
1729 * For historical compatibility, thread 1's errno value is stored in
1730 * a libc global variable 'errno', while each additional thread's
1731 * errno value is stored in ulwp_t->ul_errno. In addition,
1732 * ulwp_t->ul_errnop is set to the address of the thread's errno value,
1733 * (i.e. for tid 1, curthead->ul_errnop = &errno, for tid > 1,
1734 * curthread->ul_errnop = &curthread->ul_errno).
1735 *
1736 * Since errno itself uses *curthread->ul_errnop (see ___errno()) to
1737 * return the thread's current errno value, we do the same.
1738 */
1739 if (mdb_ctf_vread(&u, "ulwp_t", "mdb_libc_ulwp_t", ulwp_addr, 0) == -1)
1740 return (DCMD_ERR);
1741
1742 if (mdb_vread(&errval, sizeof (errval), (uintptr_t)u.ul_errnop) == -1) {
1743 mdb_warn("cannot read error value at 0x%p", u.ul_errnop);
1744 return (DCMD_ERR);
1745 }
1746
1747 mdb_printf("%d\n", errval);
1748 return (DCMD_OK);
1749 }
1750
1751 static const mdb_dcmd_t dcmds[] = {
1752 { "errno", "?", "print errno of a given TID", d_errno, NULL },
1753 { "jmp_buf", ":", "print jmp_buf contents", d_jmp_buf, NULL },
1754 { "mutex", ":[-f|v]", "dump out a mutex", d_mutex, d_mutex_help },
1755 { "psinfo", "[-v]", "prints relevant psinfo_t data", d_psinfo,
1756 d_psinfo_dcmd_help },
1757 { "siginfo", ":", "print siginfo_t structure", d_siginfo, NULL },
1758 { "sigjmp_buf", ":", "print sigjmp_buf contents", d_sigjmp_buf, NULL },
1759 { "stacks", "?[-afiv] [-c func] [-C func] [-m module] [-M module] ",
1760 "print unique thread stacks", stacks_dcmd, stacks_help },
1761 { "tid2ulwp", "?", "convert TID to ulwp_t address", tid2ulwp },
1762 { "tsd", ":-k key", "print tsd for this thread", d_tsd, NULL },
1763 { "ucontext", ":", "print ucontext_t structure", d_ucontext, NULL },
1764 { "ulwp", ":", "print ulwp_t structure", d_ulwp, NULL },
1765 { "uberdata", ":", "print uberdata_t structure", d_uberdata, NULL },
1766 { NULL }
1767 };
1768
1769 static const mdb_walker_t walkers[] = {
1770 { "ucontext", "walk ucontext_t uc_link list",
1771 NULL, uc_walk_step, NULL, NULL },
1772 { "oldcontext", "walk per-lwp oldcontext pointers",
1773 oldc_walk_init, oldc_walk_step, oldc_walk_fini, NULL },
1774 { "ulwps", "walk list of ulwp_t pointers",
1775 ulwp_walk_init, ulwp_walk_step, NULL, NULL },
1776 { "ulwp", "walk list of ulwp_t pointers",
1777 ulwp_walk_init, ulwp_walk_step, NULL, NULL },
1778 { "wchan", "walk wait channels",
1779 wchan_walk_init, wchan_walk_step, NULL, NULL },
1780 { NULL }
1781 };
1782
1783 static const mdb_modinfo_t modinfo = { MDB_API_VERSION, dcmds, walkers };
1784
1785 const mdb_modinfo_t *
_mdb_init(void)1786 _mdb_init(void)
1787 {
1788 mdb_whatis_register("threads", whatis_run_ulwps, NULL,
1789 WHATIS_PRIO_EARLY, WHATIS_REG_NO_ID);
1790
1791 return (&modinfo);
1792 }
1793