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10132 smatch fixes for MDB
Reviewed by: Andy Fiddaman <andy@omniosce.org>
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--- old/usr/src/cmd/mdb/common/kmdb/kmdb_kvm.c
+++ new/usr/src/cmd/mdb/common/kmdb/kmdb_kvm.c
1 1 /*
2 2 * CDDL HEADER START
3 3 *
4 4 * The contents of this file are subject to the terms of the
5 5 * Common Development and Distribution License (the "License").
6 6 * You may not use this file except in compliance with the License.
7 7 *
8 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 9 * or http://www.opensolaris.org/os/licensing.
10 10 * See the License for the specific language governing permissions
11 11 * and limitations under the License.
12 12 *
13 13 * When distributing Covered Code, include this CDDL HEADER in each
14 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 15 * If applicable, add the following below this CDDL HEADER, with the
16 16 * fields enclosed by brackets "[]" replaced with your own identifying
17 17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 18 *
19 19 * CDDL HEADER END
20 20 */
21 21 /*
22 22 * Copyright (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved.
23 23 * Copyright (c) 2013 by Delphix. All rights reserved.
24 24 *
25 25 * Copyright 2018 Joyent, Inc.
26 26 */
27 27
28 28 #include <kmdb/kmdb_kvm.h>
29 29 #include <kmdb/kvm.h>
30 30 #include <kmdb/kmdb_kdi.h>
31 31 #include <kmdb/kmdb_promif.h>
32 32 #include <kmdb/kmdb_module.h>
33 33 #include <kmdb/kmdb_asmutil.h>
34 34 #include <mdb/mdb_types.h>
35 35 #include <mdb/mdb_conf.h>
36 36 #include <mdb/mdb_err.h>
37 37 #include <mdb/mdb_modapi.h>
38 38 #include <mdb/mdb_target_impl.h>
39 39 #include <mdb/mdb_debug.h>
40 40 #include <mdb/mdb_string.h>
41 41 #include <mdb/mdb_ctf.h>
42 42 #include <mdb/mdb_kreg_impl.h>
43 43 #include <mdb/mdb_ks.h>
44 44 #include <mdb/mdb.h>
45 45
46 46 #include <strings.h>
47 47 #include <dlfcn.h>
48 48 #include <sys/isa_defs.h>
49 49 #include <sys/kobj.h>
50 50 #include <sys/kobj_impl.h>
51 51 #include <sys/bitmap.h>
52 52 #include <vm/as.h>
53 53
54 54 static const char KMT_RTLD_NAME[] = "krtld";
55 55 static const char KMT_MODULE[] = "mdb_ks";
56 56 static const char KMT_CTFPARENT[] = "genunix";
57 57
58 58 static mdb_list_t kmt_defbp_list; /* List of current deferred bp's */
59 59 static int kmt_defbp_lock; /* For list, running kernel holds */
60 60 static uint_t kmt_defbp_modchg_isload; /* Whether mod change is load/unload */
61 61 static struct modctl *kmt_defbp_modchg_modctl; /* modctl for defbp checking */
62 62 static uint_t kmt_defbp_num; /* Number of referenced def'd bp's */
63 63 static int kmt_defbp_bpspec; /* vespec for def'd bp activation bp */
64 64
65 65 static const mdb_se_ops_t kmt_brkpt_ops;
66 66 static const mdb_se_ops_t kmt_wapt_ops;
67 67
68 68 static void kmt_sync(mdb_tgt_t *);
69 69
70 70 typedef struct kmt_symarg {
71 71 mdb_tgt_sym_f *sym_cb; /* Caller's callback function */
72 72 void *sym_data; /* Callback function argument */
73 73 uint_t sym_type; /* Symbol type/binding filter */
74 74 mdb_syminfo_t sym_info; /* Symbol id and table id */
75 75 const char *sym_obj; /* Containing object */
76 76 } kmt_symarg_t;
77 77
78 78 typedef struct kmt_maparg {
79 79 mdb_tgt_t *map_target; /* Target used for mapping iter */
80 80 mdb_tgt_map_f *map_cb; /* Caller's callback function */
81 81 void *map_data; /* Callback function argument */
82 82 } kmt_maparg_t;
83 83
84 84 /*ARGSUSED*/
85 85 int
86 86 kmt_setflags(mdb_tgt_t *t, int flags)
87 87 {
88 88 /*
89 89 * We only handle one flag (ALLOWIO), and we can't fail to set or clear
90 90 * it, so we just blindly replace the t_flags version with the one
91 91 * passed.
92 92 */
93 93 t->t_flags = (t->t_flags & ~MDB_TGT_F_ALLOWIO) |
94 94 (flags & MDB_TGT_F_ALLOWIO);
95 95
96 96 return (0);
97 97 }
98 98
99 99 /*ARGSUSED*/
100 100 const char *
101 101 kmt_name(mdb_tgt_t *t)
102 102 {
103 103 return ("kmdb_kvm");
104 104 }
105 105
106 106 /*ARGSUSED*/
107 107 static const char *
108 108 kmt_platform(mdb_tgt_t *t)
109 109 {
110 110 static char platform[SYS_NMLN];
111 111
112 112 if (kmdb_dpi_get_state(NULL) == DPI_STATE_INIT)
113 113 return (mdb_conf_platform());
114 114
115 115 if (mdb_tgt_readsym(mdb.m_target, MDB_TGT_AS_VIRT, platform,
116 116 sizeof (platform), "unix", "platform") != sizeof (platform)) {
117 117 warn("'platform' symbol is missing from kernel\n");
118 118 return ("unknown");
119 119 }
120 120
121 121 return (platform);
122 122 }
123 123
124 124 static int
125 125 kmt_uname(mdb_tgt_t *t, struct utsname *utsp)
126 126 {
127 127 return (mdb_tgt_readsym(t, MDB_TGT_AS_VIRT, utsp,
128 128 sizeof (struct utsname), MDB_TGT_OBJ_EXEC, "utsname"));
129 129 }
130 130
131 131 /*ARGSUSED*/
132 132 static int
133 133 kmt_dmodel(mdb_tgt_t *t)
134 134 {
135 135 return (MDB_TGT_MODEL_NATIVE);
136 136 }
137 137
138 138 /*ARGSUSED*/
139 139 ssize_t
140 140 kmt_rw(mdb_tgt_t *t, void *buf, size_t nbytes, uint64_t addr,
141 141 ssize_t (*rw)(void *, size_t, uint64_t))
142 142 {
143 143 /*
144 144 * chunksz needs to be volatile because of the use of setjmp() in this
145 145 * function.
146 146 */
147 147 volatile size_t chunksz;
148 148 size_t n, ndone;
149 149 jmp_buf *oldpcb = NULL;
150 150 jmp_buf pcb;
151 151 ssize_t res;
152 152
153 153 kmdb_prom_check_interrupt();
154 154
155 155 if (nbytes == 0)
156 156 return (0);
157 157
158 158 /*
159 159 * Try to process the entire buffer, as requested. If we catch a fault,
160 160 * try smaller chunks. This allows us to handle regions that cross
161 161 * mapping boundaries.
162 162 */
163 163 chunksz = nbytes;
164 164 ndone = 0;
165 165 if (setjmp(pcb) != 0) {
166 166 if (chunksz == 1) {
167 167 /* We failed with the smallest chunk - give up */
168 168 kmdb_dpi_restore_fault_hdlr(oldpcb);
169 169 return (ndone > 0 ? ndone : -1); /* errno set for us */
170 170 } else if (chunksz > 4)
171 171 chunksz = 4;
172 172 else
173 173 chunksz = 1;
174 174 }
175 175
176 176 oldpcb = kmdb_dpi_set_fault_hdlr(&pcb);
177 177 while (nbytes > 0) {
178 178 n = MIN(chunksz, nbytes);
179 179
180 180 if ((res = rw(buf, n, addr)) != n)
181 181 return (res < 0 ? res : ndone + res);
182 182
183 183 addr += n;
184 184 nbytes -= n;
185 185 ndone += n;
186 186 buf = ((caddr_t)buf + n);
187 187 }
188 188
189 189 kmdb_dpi_restore_fault_hdlr(oldpcb);
190 190
191 191 return (ndone);
192 192 }
193 193
194 194 static void
195 195 kmt_bcopy(const void *s1, void *s2, size_t n)
196 196 {
197 197 /*
198 198 * We need to guarantee atomic accesses for certain sizes. bcopy won't
199 199 * make that guarantee, so we need to do it ourselves.
200 200 */
201 201 #ifdef _LP64
202 202 if (n == 8 && ((uintptr_t)s1 & 7) == 0 && ((uintptr_t)s2 & 7) == 0)
203 203 *(uint64_t *)s2 = *(uint64_t *)s1;
204 204 else
205 205 #endif
206 206 if (n == 4 && ((uintptr_t)s1 & 3) == 0 && ((uintptr_t)s2 & 3) == 0)
207 207 *(uint32_t *)s2 = *(uint32_t *)s1;
208 208 else if (n == 2 && ((uintptr_t)s1 & 1) == 0 && ((uintptr_t)s2 & 1) == 0)
209 209 *(uint16_t *)s2 = *(uint16_t *)s1;
210 210 else if (n == 1)
211 211 *(uint8_t *)s2 = *(uint8_t *)s1;
212 212 else
213 213 bcopy(s1, s2, n);
214 214 }
215 215
216 216 static ssize_t
217 217 kmt_reader(void *buf, size_t nbytes, uint64_t addr)
218 218 {
219 219 kmt_bcopy((void *)(uintptr_t)addr, buf, nbytes);
220 220 return (nbytes);
221 221 }
222 222
223 223 ssize_t
224 224 kmt_writer(void *buf, size_t nbytes, uint64_t addr)
225 225 {
226 226 kmt_bcopy(buf, (void *)(uintptr_t)addr, nbytes);
227 227 return (nbytes);
228 228 }
229 229
230 230 /*ARGSUSED*/
231 231 static ssize_t
232 232 kmt_read(mdb_tgt_t *t, void *buf, size_t nbytes, uintptr_t addr)
233 233 {
234 234 /*
235 235 * We don't want to allow reads of I/O-mapped memory. Multi-page reads
236 236 * that cross into I/O-mapped memory should be restricted to the initial
237 237 * non-I/O region. Reads that begin in I/O-mapped memory are failed
238 238 * outright.
239 239 */
240 240 if (!(t->t_flags & MDB_TGT_F_ALLOWIO) &&
241 241 (nbytes = kmdb_kdi_range_is_nontoxic(addr, nbytes, 0)) == 0)
242 242 return (set_errno(EMDB_NOMAP));
243 243
244 244 return (kmt_rw(t, buf, nbytes, addr, kmt_reader));
245 245 }
246 246
247 247 /*ARGSUSED*/
248 248 static ssize_t
249 249 kmt_pread(mdb_tgt_t *t, void *buf, size_t nbytes, physaddr_t addr)
250 250 {
251 251 return (kmt_rw(t, buf, nbytes, addr, kmdb_kdi_pread));
252 252 }
253 253
254 254 /*ARGSUSED*/
255 255 ssize_t
256 256 kmt_pwrite(mdb_tgt_t *t, const void *buf, size_t nbytes, physaddr_t addr)
257 257 {
258 258 return (kmt_rw(t, (void *)buf, nbytes, addr, kmdb_kdi_pwrite));
259 259 }
260 260
261 261 static uintptr_t
262 262 kmt_read_kas(mdb_tgt_t *t)
263 263 {
264 264 GElf_Sym sym;
265 265
266 266 if (mdb_tgt_lookup_by_name(t, "unix", "kas", &sym, NULL) < 0) {
267 267 warn("'kas' symbol is missing from kernel\n");
268 268 (void) set_errno(EMDB_NOSYM);
269 269 return (0);
270 270 }
271 271
272 272 return ((uintptr_t)sym.st_value);
273 273 }
274 274
275 275 static int
276 276 kmt_vtop(mdb_tgt_t *t, mdb_tgt_as_t as, uintptr_t va, physaddr_t *pap)
277 277 {
278 278 mdb_module_t *mod;
279 279 struct as *asp;
280 280 mdb_var_t *v;
281 281
282 282 switch ((uintptr_t)as) {
283 283 case (uintptr_t)MDB_TGT_AS_PHYS:
284 284 case (uintptr_t)MDB_TGT_AS_FILE:
285 285 case (uintptr_t)MDB_TGT_AS_IO:
286 286 return (set_errno(EINVAL));
287 287 case (uintptr_t)MDB_TGT_AS_VIRT:
288 288 if ((asp = (struct as *)kmt_read_kas(t)) == NULL)
289 289 return (-1); /* errno is set for us */
290 290 break;
291 291 default:
292 292 asp = (struct as *)as;
293 293
294 294 /* We don't support non-kas vtop */
295 295 if (asp != (struct as *)kmt_read_kas(t))
296 296 return (set_errno(EMDB_TGTNOTSUP));
297 297 }
298 298
299 299 if (kmdb_prom_vtop(va, pap) == 0)
300 300 return (0);
301 301
302 302 if ((v = mdb_nv_lookup(&mdb.m_modules, "unix")) != NULL &&
303 303 (mod = mdb_nv_get_cookie(v)) != NULL) {
304 304 int (*fptr)(uintptr_t, struct as *, physaddr_t *);
305 305
306 306 fptr = (int (*)(uintptr_t, struct as *, physaddr_t *))
307 307 dlsym(mod->mod_hdl, "platform_vtop");
308 308
309 309 if ((fptr != NULL) && ((*fptr)(va, asp, pap) == 0))
310 310 return (0);
311 311 }
312 312
313 313 return (set_errno(EMDB_NOMAP));
314 314 }
315 315
316 316 /*ARGSUSED*/
317 317 static int
318 318 kmt_cpuregs(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
319 319 {
320 320 const mdb_tgt_gregset_t *gregs;
321 321 intptr_t cpuid = DPI_MASTER_CPUID;
322 322 int i;
323 323
324 324 if (flags & DCMD_ADDRSPEC) {
325 325 if (argc != 0)
326 326 return (DCMD_USAGE);
327 327 if ((cpuid = mdb_cpu2cpuid(addr)) < 0) {
328 328 (void) set_errno(EMDB_NOMAP);
329 329 mdb_warn("failed to find cpuid for cpu at %p", addr);
330 330 return (DCMD_ERR);
331 331 }
332 332 }
333 333
334 334 i = mdb_getopts(argc, argv,
335 335 'c', MDB_OPT_UINTPTR, &cpuid,
336 336 NULL);
337 337
338 338 argc -= i;
339 339 argv += i;
340 340
341 341 if (argc != 0)
342 342 return (DCMD_USAGE);
343 343
344 344 if ((gregs = kmdb_dpi_get_gregs(cpuid)) == NULL) {
345 345 warn("failed to retrieve registers for cpu %d", (int)cpuid);
346 346 return (DCMD_ERR);
347 347 }
348 348
349 349 kmt_printregs(gregs);
350 350
351 351 return (DCMD_OK);
352 352 }
353 353
354 354 static int
355 355 kmt_regs(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
356 356 {
357 357 if (flags & DCMD_ADDRSPEC)
358 358 return (DCMD_USAGE);
359 359
360 360 return (kmt_cpuregs(addr, flags, argc, argv));
361 361 }
362 362
363 363 static int
364 364 kmt_cpustack_dcmd(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
365 365 {
366 366 intptr_t cpuid = DPI_MASTER_CPUID;
367 367 uint_t verbose = 0;
368 368 int i;
369 369
370 370 if (flags & DCMD_ADDRSPEC) {
371 371 if ((cpuid = mdb_cpu2cpuid(addr)) < 0) {
372 372 (void) set_errno(EMDB_NOMAP);
373 373 mdb_warn("failed to find cpuid for cpu at %p", addr);
374 374 return (DCMD_ERR);
375 375 }
376 376 flags &= ~DCMD_ADDRSPEC;
377 377 }
378 378
379 379 i = mdb_getopts(argc, argv,
380 380 'c', MDB_OPT_UINTPTR, &cpuid,
381 381 'v', MDB_OPT_SETBITS, 1, &verbose,
382 382 NULL);
383 383
384 384 argc -= i;
385 385 argv += i;
386 386
387 387 return (kmt_cpustack(addr, flags, argc, argv, cpuid, verbose));
388 388 }
389 389
390 390 /*
391 391 * Lasciate ogne speranza, voi ch'intrate.
392 392 */
393 393 static int
394 394 kmt_call(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
395 395 {
396 396 uintptr_t *call_argv, rval;
397 397 int parse_strings = 1;
398 398 GElf_Sym sym;
399 399 jmp_buf *oldpcb = NULL;
400 400 jmp_buf pcb;
401 401 int i;
402 402
403 403 if (!(flags & DCMD_ADDRSPEC))
404 404 return (DCMD_USAGE);
405 405
406 406 if (mdb_tgt_lookup_by_addr(mdb.m_target, addr, MDB_TGT_SYM_EXACT,
407 407 NULL, 0, &sym, NULL) == 0 && GELF_ST_TYPE(sym.st_info) !=
408 408 STT_FUNC) {
409 409 warn("%a is not a function\n", addr);
410 410 return (DCMD_ERR);
411 411 }
412 412
413 413 if (argc > 1 && argv[0].a_type == MDB_TYPE_STRING &&
414 414 strcmp(argv[0].a_un.a_str, "-s") == 0) {
415 415 parse_strings = 0;
416 416 argc--;
417 417 argv++;
418 418 }
419 419
420 420 call_argv = mdb_alloc(sizeof (uintptr_t) * argc, UM_SLEEP);
421 421
422 422 for (i = 0; i < argc; i++) {
423 423 switch (argv[i].a_type) {
424 424 case MDB_TYPE_STRING:
425 425 /*
426 426 * mdb_strtoull doesn't return on error, so we have to
427 427 * pre-check strings suspected to contain numbers.
428 428 */
429 429 if (parse_strings && strisbasenum(argv[i].a_un.a_str)) {
430 430 call_argv[i] = (uintptr_t)mdb_strtoull(
431 431 argv[i].a_un.a_str);
432 432 } else
433 433 call_argv[i] = (uintptr_t)argv[i].a_un.a_str;
434 434
435 435 break;
436 436
437 437 case MDB_TYPE_IMMEDIATE:
438 438 call_argv[i] = argv[i].a_un.a_val;
439 439 break;
440 440
441 441 default:
442 442 mdb_free(call_argv,
443 443 sizeof (uintptr_t) * argc);
444 444 return (DCMD_USAGE);
445 445 }
446 446 }
447 447
448 448 if (setjmp(pcb) != 0) {
449 449 warn("call failed: caught a trap\n");
450 450
451 451 kmdb_dpi_restore_fault_hdlr(oldpcb);
452 452 mdb_free(call_argv, sizeof (uintptr_t) * argc);
453 453 return (DCMD_ERR);
454 454 }
455 455
456 456 oldpcb = kmdb_dpi_set_fault_hdlr(&pcb);
457 457 rval = kmdb_dpi_call(addr, argc, call_argv);
458 458 kmdb_dpi_restore_fault_hdlr(oldpcb);
459 459
460 460 if (flags & DCMD_PIPE_OUT) {
461 461 mdb_printf("%p\n", rval);
462 462 } else {
463 463 /* pretty-print the results */
464 464 mdb_printf("%p = %a(", rval, addr);
465 465 for (i = 0; i < argc; i++) {
466 466 if (i > 0)
467 467 mdb_printf(", ");
468 468 if (argv[i].a_type == MDB_TYPE_STRING) {
469 469 /* I'm ashamed but amused */
470 470 char *quote = &("\""[parse_strings &&
471 471 strisbasenum(argv[i].a_un.a_str)]);
472 472
473 473 mdb_printf("%s%s%s", quote, argv[i].a_un.a_str,
474 474 quote);
475 475 } else
476 476 mdb_printf("%p", argv[i].a_un.a_val);
477 477 }
478 478 mdb_printf(");\n");
479 479 }
480 480
481 481 mdb_free(call_argv, sizeof (uintptr_t) * argc);
482 482
483 483 return (DCMD_OK);
484 484 }
485 485
486 486 /*ARGSUSED*/
487 487 int
488 488 kmt_dump_crumbs(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
489 489 {
490 490 intptr_t cpu = -1;
491 491
492 492 if (flags & DCMD_ADDRSPEC) {
493 493 if (argc != 0)
494 494 return (DCMD_USAGE);
495 495 } else {
496 496 addr = 0;
497 497
498 498 if (mdb_getopts(argc, argv,
499 499 'c', MDB_OPT_UINTPTR, &cpu,
500 500 NULL) != argc)
501 501 return (DCMD_USAGE);
502 502 }
503 503
504 504 kmdb_dpi_dump_crumbs(addr, cpu);
505 505
506 506 return (DCMD_OK);
507 507 }
508 508
509 509 /*ARGSUSED*/
510 510 static int
511 511 kmt_noducttape(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
512 512 {
513 513 int a = 0;
514 514
515 515 return (a/a);
516 516 }
517 517
518 518 static int
519 519 kmt_dmod_status(char *msg, int state)
520 520 {
521 521 kmdb_modctl_t *kmc;
522 522 mdb_var_t *v;
523 523 int first = 1, n = 0;
524 524
525 525 mdb_nv_rewind(&mdb.m_dmodctl);
526 526 while ((v = mdb_nv_advance(&mdb.m_dmodctl)) != NULL) {
527 527 kmc = MDB_NV_COOKIE(v);
528 528
529 529 if (kmc->kmc_state != state)
530 530 continue;
531 531
532 532 n++;
533 533
534 534 if (msg != NULL) {
535 535 if (first) {
536 536 mdb_printf(msg, NULL);
537 537 first = 0;
538 538 }
539 539
540 540 mdb_printf(" %s", kmc->kmc_modname);
541 541 }
542 542 }
543 543
544 544 if (!first && msg != NULL)
545 545 mdb_printf("\n");
546 546
547 547 return (n);
548 548 }
549 549
550 550 /*ARGSUSED*/
551 551 static int
552 552 kmt_status_dcmd(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
553 553 {
554 554 struct utsname uts;
555 555 char uuid[37];
556 556 kreg_t tt;
557 557
558 558 if (mdb_tgt_readsym(mdb.m_target, MDB_TGT_AS_VIRT, &uts, sizeof (uts),
559 559 "unix", "utsname") != sizeof (uts)) {
560 560 warn("failed to read 'utsname' struct from kernel\n");
561 561 bzero(&uts, sizeof (uts));
562 562 (void) strcpy(uts.nodename, "unknown machine");
563 563 }
564 564
565 565 mdb_printf("debugging live kernel (%d-bit) on %s\n",
566 566 (int)(sizeof (void *) * NBBY),
567 567 (*uts.nodename == '\0' ? "(not set)" : uts.nodename));
568 568 mdb_printf("operating system: %s %s (%s)\n",
569 569 uts.release, uts.version, uts.machine);
570 570
571 571 if (mdb_tgt_readsym(mdb.m_target, MDB_TGT_AS_VIRT, uuid, sizeof (uuid),
572 572 "genunix", "dump_osimage_uuid") != sizeof (uuid)) {
573 573 warn("failed to read 'dump_osimage_uuid' string from kernel\n");
574 574 (void) strcpy(uuid, "(error)");
575 575 } else if (*uuid == '\0') {
576 576 (void) strcpy(uuid, "(not set)");
577 577 } else if (uuid[36] != '\0') {
578 578 (void) strcpy(uuid, "(invalid)");
579 579 }
580 580 mdb_printf("image uuid: %s\n", uuid);
581 581
582 582 mdb_printf("DTrace state: %s\n", (kmdb_kdi_dtrace_get_state() ==
583 583 KDI_DTSTATE_DTRACE_ACTIVE ? "active (debugger breakpoints cannot "
584 584 "be armed)" : "inactive"));
585 585
586 586 (void) kmdb_dpi_get_register("tt", &tt);
587 587 mdb_printf("stopped on: %s\n", kmt_trapname(tt));
588 588
589 589 (void) kmt_dmod_status("pending dmod loads:", KMDB_MC_STATE_LOADING);
590 590 (void) kmt_dmod_status("pending dmod unloads:",
591 591 KMDB_MC_STATE_UNLOADING);
592 592
593 593 return (DCMD_OK);
594 594 }
595 595
596 596 /*ARGSUSED*/
597 597 static int
598 598 kmt_switch(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
599 599 {
600 600 if (!(flags & DCMD_ADDRSPEC) || argc != 0)
601 601 return (DCMD_USAGE);
602 602
603 603 if (kmdb_dpi_switch_master((int)addr) < 0) {
604 604 warn("failed to switch to CPU %d", (int)addr);
605 605 return (DCMD_ERR);
606 606 }
607 607
608 608 return (DCMD_OK);
609 609 }
610 610
611 611 static const mdb_dcmd_t kmt_dcmds[] = {
612 612 { "$c", "?[cnt]", "print stack backtrace", kmt_stack },
613 613 { "$C", "?[cnt]", "print stack backtrace", kmt_stackv },
614 614 { "$r", NULL, "print general-purpose registers", kmt_regs },
615 615 { "$?", NULL, "print status and registers", kmt_regs },
616 616 { ":x", ":", "change the active CPU", kmt_switch },
617 617 { "call", ":[arg ...]", "call a kernel function", kmt_call },
618 618 { "cpustack", "?[-v] [-c cpuid] [cnt]", "print stack backtrace for a "
619 619 "specific CPU", kmt_cpustack_dcmd },
620 620 { "cpuregs", "?[-c cpuid]", "print general-purpose registers for a "
621 621 "specific CPU", kmt_cpuregs },
622 622 { "crumbs", NULL, NULL, kmt_dump_crumbs },
623 623 #if defined(__i386) || defined(__amd64)
624 624 { "in", ":[-L len]", "read from I/O port", kmt_in_dcmd },
625 625 { "out", ":[-L len] val", "write to I/O port", kmt_out_dcmd },
626 626 { "rdmsr", ":", "read an MSR", kmt_rdmsr },
627 627 { "wrmsr", ": val", "write an MSR", kmt_wrmsr },
628 628 { "rdpcicfg", ": bus dev func", "read a register in PCI config space",
629 629 kmt_rdpcicfg },
630 630 { "wrpcicfg", ": bus dev func val", "write a register in PCI config "
631 631 "space", kmt_wrpcicfg },
632 632 #endif
633 633 { "noducttape", NULL, NULL, kmt_noducttape },
634 634 { "regs", NULL, "print general-purpose registers", kmt_regs },
635 635 { "stack", "?[cnt]", "print stack backtrace", kmt_stack },
636 636 { "stackregs", "?", "print stack backtrace and registers", kmt_stackr },
637 637 { "status", NULL, "print summary of current target", kmt_status_dcmd },
638 638 { "switch", ":", "change the active CPU", kmt_switch },
639 639 { NULL }
640 640 };
641 641
642 642 static uintmax_t
643 643 kmt_reg_disc_get(const mdb_var_t *v)
644 644 {
645 645 mdb_tgt_reg_t r = 0;
646 646
647 647 (void) mdb_tgt_getareg(MDB_NV_COOKIE(v), 0, mdb_nv_get_name(v), &r);
648 648
649 649 return (r);
650 650 }
651 651
652 652 static void
653 653 kmt_reg_disc_set(mdb_var_t *v, uintmax_t r)
654 654 {
655 655 if (mdb_tgt_putareg(MDB_NV_COOKIE(v), 0, mdb_nv_get_name(v), r) == -1)
656 656 warn("failed to modify %%%s register", mdb_nv_get_name(v));
657 657 }
658 658
659 659 static const mdb_nv_disc_t kmt_reg_disc = {
660 660 kmt_reg_disc_set,
661 661 kmt_reg_disc_get
662 662 };
663 663
664 664 /*ARGSUSED*/
665 665 static int
666 666 kmt_getareg(mdb_tgt_t *t, mdb_tgt_tid_t tid, const char *rname,
667 667 mdb_tgt_reg_t *rp)
668 668 {
669 669 kreg_t val;
670 670
671 671 if (kmdb_dpi_get_register(rname, &val) < 0)
672 672 return (set_errno(EMDB_BADREG));
673 673
674 674 *rp = val;
675 675 return (0);
676 676 }
677 677
678 678 /*ARGSUSED*/
679 679 static int
680 680 kmt_putareg(mdb_tgt_t *t, mdb_tgt_tid_t tid, const char *rname, mdb_tgt_reg_t r)
681 681 {
682 682 if (kmdb_dpi_set_register(rname, r) < 0)
683 683 return (set_errno(EMDB_BADREG));
684 684
685 685 return (0);
686 686 }
687 687
688 688 static void
689 689 kmt_mod_destroy(kmt_module_t *km)
690 690 {
691 691 if (km->km_name != NULL)
692 692 strfree(km->km_name);
693 693 if (km->km_symtab != NULL)
694 694 mdb_gelf_symtab_destroy(km->km_symtab);
695 695 if (km->km_ctfp != NULL)
696 696 mdb_ctf_close(km->km_ctfp);
697 697 }
698 698
699 699 static kmt_module_t *
700 700 kmt_mod_create(mdb_tgt_t *t, struct modctl *ctlp, char *name)
701 701 {
702 702 kmt_module_t *km = mdb_zalloc(sizeof (kmt_module_t), UM_SLEEP);
703 703 struct module *mod;
704 704
705 705 km->km_name = mdb_alloc(strlen(name) + 1, UM_SLEEP);
706 706 (void) strcpy(km->km_name, name);
707 707
708 708 bcopy(ctlp, &km->km_modctl, sizeof (struct modctl));
709 709
710 710 if (mdb_tgt_vread(t, &km->km_module, sizeof (struct module),
711 711 (uintptr_t)km->km_modctl.mod_mp) != sizeof (struct module))
712 712 goto create_module_cleanup;
713 713 mod = &km->km_module;
714 714
715 715 if (mod->symhdr != NULL && mod->strhdr != NULL && mod->symtbl != NULL &&
716 716 mod->strings != NULL) {
717 717 mdb_gelf_ehdr_to_gehdr(&mod->hdr, &km->km_ehdr);
718 718
719 719 km->km_symtab = mdb_gelf_symtab_create_raw(&km->km_ehdr,
720 720 mod->symhdr, mod->symtbl, mod->strhdr, mod->strings,
721 721 MDB_TGT_SYMTAB);
722 722
723 723 km->km_symtab_va = mod->symtbl;
724 724 km->km_strtab_va = mod->strings;
725 725
726 726 if (mdb_tgt_vread(t, &km->km_symtab_hdr, sizeof (Shdr),
727 727 (uintptr_t)mod->symhdr) != sizeof (Shdr) ||
728 728 mdb_tgt_vread(t, &km->km_strtab_hdr, sizeof (Shdr),
729 729 (uintptr_t)mod->strhdr) != sizeof (Shdr))
730 730 goto create_module_cleanup;
731 731 }
732 732
733 733 /*
734 734 * We don't want everyone rooting around in the module structure, so we
735 735 * make copies of the interesting members.
736 736 */
737 737 km->km_text_va = (uintptr_t)mod->text;
738 738 km->km_text_size = mod->text_size;
739 739 km->km_data_va = (uintptr_t)mod->data;
740 740 km->km_data_size = mod->data_size;
741 741 km->km_bss_va = (uintptr_t)mod->bss;
742 742 km->km_bss_size = mod->bss_size;
743 743 km->km_ctf_va = mod->ctfdata;
744 744 km->km_ctf_size = mod->ctfsize;
745 745
746 746 if (mod->flags & KOBJ_PRIM)
747 747 km->km_flags |= KM_F_PRIMARY;
748 748
749 749 return (km);
750 750
751 751 create_module_cleanup:
752 752 warn("failed to read module %s\n", name);
753 753 kmt_mod_destroy(km);
754 754 return (NULL);
755 755 }
756 756
757 757 static void
758 758 kmt_mod_remove(kmt_data_t *kmt, kmt_module_t *km)
759 759 {
760 760 mdb_var_t *v = mdb_nv_lookup(&kmt->kmt_modules, km->km_name);
761 761
762 762 ASSERT(v != NULL);
763 763
764 764 mdb_dprintf(MDB_DBG_KMOD, "removing module %s\n", km->km_name);
765 765
766 766 mdb_list_delete(&kmt->kmt_modlist, km);
767 767 mdb_nv_remove(&kmt->kmt_modules, v);
768 768 kmt_mod_destroy(km);
769 769 }
770 770
771 771 static int
772 772 kmt_modlist_update_cb(struct modctl *modp, void *arg)
773 773 {
774 774 mdb_tgt_t *t = arg;
775 775 kmt_data_t *kmt = t->t_data;
776 776 kmt_module_t *km;
777 777 mdb_var_t *v;
778 778 char name[MAXNAMELEN];
779 779
780 780 if (mdb_tgt_readstr(t, MDB_TGT_AS_VIRT, name, MAXNAMELEN,
781 781 (uintptr_t)modp->mod_modname) <= 0) {
782 782 warn("failed to read module name at %p",
783 783 (void *)modp->mod_modname);
784 784 }
785 785
786 786 /* We only care about modules that are actually loaded */
787 787 if (!kmdb_kdi_mod_isloaded(modp))
788 788 return (0);
789 789
790 790 /*
791 791 * Skip the modules we already know about and that haven't
792 792 * changed since last time we were here.
793 793 */
794 794 if ((v = mdb_nv_lookup(&kmt->kmt_modules, name)) != NULL) {
795 795 km = MDB_NV_COOKIE(v);
796 796
797 797 if (kmdb_kdi_mod_haschanged(&km->km_modctl, &km->km_module,
798 798 modp, modp->mod_mp)) {
799 799 /*
800 800 * The module has changed since last we saw it. For
801 801 * safety, remove our old version, and treat it as a
802 802 * new module.
803 803 */
804 804 mdb_dprintf(MDB_DBG_KMOD, "stutter module %s\n", name);
805 805 kmt_mod_remove(kmt, km);
806 806 } else {
807 807 km->km_seen = 1;
808 808 return (0);
809 809 }
810 810 }
811 811
812 812 mdb_dprintf(MDB_DBG_KMOD, "found new module %s\n", name);
813 813
814 814 if ((km = kmt_mod_create(t, modp, name)) != NULL) {
815 815 mdb_list_append(&kmt->kmt_modlist, km);
816 816 (void) mdb_nv_insert(&kmt->kmt_modules, name, NULL,
817 817 (uintptr_t)km, 0);
818 818 km->km_seen = 1;
819 819 }
820 820
821 821 return (0);
822 822 }
823 823
824 824 static void
825 825 kmt_modlist_update(mdb_tgt_t *t)
826 826 {
827 827 kmt_data_t *kmt = t->t_data;
828 828 kmt_module_t *km, *kmn;
829 829
830 830 if (kmdb_kdi_mod_iter(kmt_modlist_update_cb, t) < 0) {
831 831 warn("failed to complete update of kernel module list\n");
832 832 return;
833 833 }
834 834
835 835 km = mdb_list_next(&kmt->kmt_modlist);
836 836 while (km != NULL) {
837 837 kmn = mdb_list_next(km);
838 838
839 839 if (km->km_seen == 1) {
840 840 /* Reset the mark for next time */
841 841 km->km_seen = 0;
842 842 } else {
843 843 /*
844 844 * We didn't see it on the kernel's module list, so
845 845 * remove it from our view of the world.
846 846 */
847 847 kmt_mod_remove(kmt, km);
848 848 }
849 849
850 850 km = kmn;
851 851 }
852 852 }
853 853
854 854 static void
855 855 kmt_periodic(mdb_tgt_t *t)
856 856 {
857 857 (void) mdb_tgt_status(t, &t->t_status);
858 858 }
859 859
860 860 int
861 861 kmt_lookup_by_addr(mdb_tgt_t *t, uintptr_t addr, uint_t flags,
862 862 char *buf, size_t nbytes, GElf_Sym *symp, mdb_syminfo_t *sip)
863 863 {
864 864 kmt_data_t *kmt = t->t_data;
865 865 kmt_module_t *km = mdb_list_next(&kmt->kmt_modlist);
866 866 kmt_module_t *sym_km = NULL;
867 867 kmt_module_t prmod;
868 868 GElf_Sym sym;
869 869 uint_t symid;
870 870 const char *name;
871 871
872 872 /*
873 873 * We look through the private symbols (if any), then through the module
874 874 * symbols. We can simplify the loop if we pretend the private symbols
875 875 * come from a module.
876 876 */
877 877 if (mdb.m_prsym != NULL) {
878 878 bzero(&prmod, sizeof (kmt_module_t));
879 879 prmod.km_name = "<<<prmod>>>";
880 880 prmod.km_symtab = mdb.m_prsym;
881 881 prmod.km_list.ml_next = (mdb_list_t *)km;
882 882 km = &prmod;
883 883 }
884 884
885 885 /* Symbol resolution isn't available during initialization */
886 886 if (kmdb_dpi_get_state(NULL) == DPI_STATE_INIT)
887 887 return (set_errno(EMDB_NOSYM));
888 888
889 889 for (; km != NULL; km = mdb_list_next(km)) {
890 890 if (km != &prmod && !kmt->kmt_symavail)
891 891 continue;
892 892
893 893 if (km->km_symtab == NULL)
894 894 continue;
895 895
896 896 if (mdb_gelf_symtab_lookup_by_addr(km->km_symtab, addr, flags,
897 897 buf, nbytes, symp, &sip->sym_id) != 0 ||
898 898 symp->st_value == 0)
899 899 continue;
900 900
901 901 if (flags & MDB_TGT_SYM_EXACT) {
902 902 sym_km = km;
903 903 goto found;
904 904 }
905 905
906 906 /*
907 907 * If this is the first match we've found, or if this symbol is
908 908 * closer to the specified address than the last one we found,
909 909 * use it.
910 910 */
911 911 if (sym_km == NULL || mdb_gelf_sym_closer(symp, &sym, addr)) {
912 912 sym_km = km;
913 913 sym = *symp;
914 914 symid = sip->sym_id;
915 915 }
916 916 }
917 917
918 918 /*
919 919 * kmdb dmods are normal kernel modules, loaded by krtld as such. To
920 920 * avoid polluting modinfo, and to keep from confusing the module
921 921 * subsystem (many dmods have the same names as real kernel modules),
922 922 * kmdb keeps their modctls separate, and doesn't allow their loading
923 923 * to be broadcast via the krtld module load/unload mechanism. As a
924 924 * result, kmdb_kvm doesn't find out about them, and can't turn their
925 925 * addresses into symbols. This can be most inconvenient during
926 926 * debugger faults, as the dmod frames will show up without names.
927 927 * We weren't able to turn the requested address into a symbol, so we'll
928 928 * take a spin through the dmods, trying to match our address against
929 929 * their symbols.
930 930 */
931 931 if (sym_km == NULL) {
932 932 return (kmdb_module_lookup_by_addr(addr, flags, buf, nbytes,
933 933 symp, sip));
934 934 }
935 935
936 936 *symp = sym;
937 937 sip->sym_id = symid;
938 938
939 939 found:
940 940 /*
941 941 * Once we've found something, copy the final name into the caller's
942 942 * buffer and prefix it with the load object name if appropriate.
943 943 */
944 944 name = mdb_gelf_sym_name(sym_km->km_symtab, symp);
945 945
946 946 if (sym_km == &prmod) {
947 947 if (buf != NULL) {
948 948 (void) strncpy(buf, name, nbytes);
949 949 buf[nbytes - 1] = '\0';
950 950 }
951 951 sip->sym_table = MDB_TGT_PRVSYM;
952 952 } else {
953 953 if (buf != NULL) {
954 954 if (sym_km->km_flags & KM_F_PRIMARY) {
955 955 (void) strncpy(buf, name, nbytes);
956 956 buf[nbytes - 1] = '\0';
957 957 } else {
958 958 (void) mdb_snprintf(buf, nbytes, "%s`%s",
959 959 sym_km->km_name, name);
960 960 }
961 961 }
962 962 sip->sym_table = MDB_TGT_SYMTAB;
963 963 }
964 964
965 965 return (0);
966 966 }
967 967
968 968 static int
969 969 kmt_lookup_by_name(mdb_tgt_t *t, const char *obj, const char *name,
970 970 GElf_Sym *symp, mdb_syminfo_t *sip)
971 971 {
972 972 kmt_data_t *kmt = t->t_data;
973 973 kmt_module_t *km;
974 974 mdb_var_t *v;
975 975 GElf_Sym sym;
976 976 uint_t symid;
977 977 int n;
978 978
979 979 if (!kmt->kmt_symavail)
980 980 return (set_errno(EMDB_NOSYM));
981 981
982 982 switch ((uintptr_t)obj) {
983 983 case (uintptr_t)MDB_TGT_OBJ_EXEC:
984 984 case (uintptr_t)MDB_TGT_OBJ_EVERY:
985 985 km = mdb_list_next(&kmt->kmt_modlist);
986 986 n = mdb_nv_size(&kmt->kmt_modules);
987 987 break;
988 988
989 989 case (uintptr_t)MDB_TGT_OBJ_RTLD:
990 990 obj = kmt->kmt_rtld_name;
991 991 /*FALLTHROUGH*/
992 992
993 993 default:
994 994 /*
995 995 * If this is a request for a dmod symbol, let kmdb_module
996 996 * handle it.
997 997 */
998 998 if (obj != NULL && strncmp(obj, "DMOD`", 5) == 0) {
999 999 return (kmdb_module_lookup_by_name(obj + 5, name,
1000 1000 symp, sip));
1001 1001 }
1002 1002
1003 1003 if ((v = mdb_nv_lookup(&kmt->kmt_modules, obj)) == NULL)
1004 1004 return (set_errno(EMDB_NOOBJ));
1005 1005
1006 1006 km = mdb_nv_get_cookie(v);
1007 1007 n = 1;
1008 1008 }
1009 1009
1010 1010 /*
1011 1011 * kmdb's kvm target is at a bit of a disadvantage compared to mdb's
1012 1012 * kvm target when it comes to global symbol lookups. mdb has ksyms,
1013 1013 * which hides pesky things like symbols that are undefined in unix,
1014 1014 * but which are defined in genunix. We don't have such a facility -
1015 1015 * we simply iterate through the modules, looking for a given symbol
1016 1016 * in each. Unless we're careful, we'll return the undef in the
1017 1017 * aforementioned case.
1018 1018 */
1019 1019 for (; n > 0; n--, km = mdb_list_next(km)) {
1020 1020 if (mdb_gelf_symtab_lookup_by_name(km->km_symtab, name,
1021 1021 &sym, &symid) == 0 && sym.st_shndx != SHN_UNDEF)
1022 1022 break;
1023 1023 }
1024 1024
1025 1025 if (n == 0)
1026 1026 return (set_errno(EMDB_NOSYM));
1027 1027
1028 1028 found:
1029 1029 bcopy(&sym, symp, sizeof (GElf_Sym));
1030 1030 sip->sym_id = symid;
1031 1031 sip->sym_table = MDB_TGT_SYMTAB;
1032 1032
1033 1033 return (0);
1034 1034 }
1035 1035
1036 1036 static int
1037 1037 kmt_symtab_func(void *data, const GElf_Sym *sym, const char *name, uint_t id)
1038 1038 {
1039 1039 kmt_symarg_t *arg = data;
1040 1040
1041 1041 if (mdb_tgt_sym_match(sym, arg->sym_type)) {
1042 1042 arg->sym_info.sym_id = id;
1043 1043
1044 1044 return (arg->sym_cb(arg->sym_data, sym, name, &arg->sym_info,
1045 1045 arg->sym_obj));
1046 1046 }
1047 1047
1048 1048 return (0);
1049 1049 }
1050 1050
1051 1051 static void
1052 1052 kmt_symtab_iter(mdb_gelf_symtab_t *gst, uint_t type, const char *obj,
1053 1053 mdb_tgt_sym_f *cb, void *p)
1054 1054 {
1055 1055 kmt_symarg_t arg;
1056 1056
1057 1057 arg.sym_cb = cb;
1058 1058 arg.sym_data = p;
1059 1059 arg.sym_type = type;
1060 1060 arg.sym_info.sym_table = gst->gst_tabid;
1061 1061 arg.sym_obj = obj;
1062 1062
1063 1063 mdb_gelf_symtab_iter(gst, kmt_symtab_func, &arg);
1064 1064 }
1065 1065
1066 1066 static int
1067 1067 kmt_symbol_iter(mdb_tgt_t *t, const char *obj, uint_t which, uint_t type,
1068 1068 mdb_tgt_sym_f *cb, void *data)
1069 1069 {
1070 1070 kmt_data_t *kmt = t->t_data;
1071 1071 kmt_module_t *km;
1072 1072
1073 1073 mdb_gelf_symtab_t *symtab = NULL;
1074 1074 mdb_var_t *v;
1075 1075
1076 1076 if (which == MDB_TGT_DYNSYM)
1077 1077 return (set_errno(EMDB_TGTNOTSUP));
1078 1078
1079 1079 switch ((uintptr_t)obj) {
1080 1080 case (uintptr_t)MDB_TGT_OBJ_EXEC:
1081 1081 case (uintptr_t)MDB_TGT_OBJ_EVERY:
1082 1082 mdb_nv_rewind(&kmt->kmt_modules);
1083 1083 while ((v = mdb_nv_advance(&kmt->kmt_modules)) != NULL) {
1084 1084 km = mdb_nv_get_cookie(v);
1085 1085
1086 1086 if (km->km_symtab != NULL) {
1087 1087 kmt_symtab_iter(km->km_symtab, type,
1088 1088 km->km_name, cb, data);
1089 1089 }
1090 1090 }
1091 1091 return (0);
1092 1092
1093 1093 case (uintptr_t)MDB_TGT_OBJ_RTLD:
1094 1094 obj = kmt->kmt_rtld_name;
1095 1095 /*FALLTHROUGH*/
1096 1096
1097 1097 default:
1098 1098 if (strncmp(obj, "DMOD`", 5) == 0) {
1099 1099 return (kmdb_module_symbol_iter(obj + 5, type,
1100 1100 cb, data));
1101 1101 }
1102 1102
1103 1103 if ((v = mdb_nv_lookup(&kmt->kmt_modules, obj)) == NULL)
1104 1104 return (set_errno(EMDB_NOOBJ));
1105 1105 km = mdb_nv_get_cookie(v);
1106 1106
1107 1107 symtab = km->km_symtab;
1108 1108 }
1109 1109
1110 1110 if (symtab != NULL)
1111 1111 kmt_symtab_iter(symtab, type, obj, cb, data);
1112 1112
1113 1113 return (0);
1114 1114 }
1115 1115
1116 1116 static int
1117 1117 kmt_mapping_walk(uintptr_t addr, const void *data, kmt_maparg_t *marg)
1118 1118 {
1119 1119 /*
1120 1120 * This is a bit sketchy but avoids problematic compilation of this
1121 1121 * target against the current VM implementation. Now that we have
1122 1122 * vmem, we can make this less broken and more informative by changing
1123 1123 * this code to invoke the vmem walker in the near future.
1124 1124 */
1125 1125 const struct kmt_seg {
1126 1126 caddr_t s_base;
1127 1127 size_t s_size;
1128 1128 } *segp = (const struct kmt_seg *)data;
1129 1129
1130 1130 mdb_map_t map;
1131 1131 GElf_Sym sym;
1132 1132 mdb_syminfo_t info;
1133 1133
1134 1134 map.map_base = (uintptr_t)segp->s_base;
1135 1135 map.map_size = segp->s_size;
1136 1136 map.map_flags = MDB_TGT_MAP_R | MDB_TGT_MAP_W | MDB_TGT_MAP_X;
1137 1137
1138 1138 if (kmt_lookup_by_addr(marg->map_target, addr, MDB_TGT_SYM_EXACT,
1139 1139 map.map_name, MDB_TGT_MAPSZ, &sym, &info) == -1) {
1140 1140
1141 1141 (void) mdb_iob_snprintf(map.map_name, MDB_TGT_MAPSZ,
1142 1142 "%lr", addr);
1143 1143 }
1144 1144
1145 1145 return (marg->map_cb(marg->map_data, &map, map.map_name));
1146 1146 }
1147 1147
1148 1148 static int
1149 1149 kmt_mapping_iter(mdb_tgt_t *t, mdb_tgt_map_f *func, void *private)
1150 1150 {
1151 1151 kmt_maparg_t m;
1152 1152 uintptr_t kas;
1153 1153
1154 1154 m.map_target = t;
1155 1155 m.map_cb = func;
1156 1156 m.map_data = private;
1157 1157
1158 1158 if ((kas = kmt_read_kas(t)) == NULL)
1159 1159 return (-1); /* errno is set for us */
1160 1160
1161 1161 return (mdb_pwalk("seg", (mdb_walk_cb_t)kmt_mapping_walk, &m, kas));
1162 1162 }
1163 1163
1164 1164 static const mdb_map_t *
1165 1165 kmt_mod_to_map(kmt_module_t *km, mdb_map_t *map)
1166 1166 {
1167 1167 (void) strncpy(map->map_name, km->km_name, MDB_TGT_MAPSZ);
1168 1168 map->map_name[MDB_TGT_MAPSZ - 1] = '\0';
1169 1169 map->map_base = km->km_text_va;
1170 1170 map->map_size = km->km_text_size;
1171 1171 map->map_flags = MDB_TGT_MAP_R | MDB_TGT_MAP_W | MDB_TGT_MAP_X;
1172 1172
1173 1173 return (map);
1174 1174 }
1175 1175
1176 1176 static int
1177 1177 kmt_object_iter(mdb_tgt_t *t, mdb_tgt_map_f *func, void *private)
1178 1178 {
1179 1179 kmt_data_t *kmt = t->t_data;
1180 1180 kmt_module_t *km;
1181 1181 mdb_map_t m;
1182 1182
1183 1183 for (km = mdb_list_next(&kmt->kmt_modlist); km != NULL;
1184 1184 km = mdb_list_next(km)) {
1185 1185 if (func(private, kmt_mod_to_map(km, &m), km->km_name) == -1)
1186 1186 break;
1187 1187 }
1188 1188
1189 1189 return (0);
1190 1190 }
1191 1191
1192 1192 static const mdb_map_t *
1193 1193 kmt_addr_to_map(mdb_tgt_t *t, uintptr_t addr)
1194 1194 {
1195 1195 kmt_data_t *kmt = t->t_data;
1196 1196 kmt_module_t *km;
1197 1197
1198 1198 for (km = mdb_list_next(&kmt->kmt_modlist); km != NULL;
1199 1199 km = mdb_list_next(km)) {
1200 1200 if (addr - km->km_text_va < km->km_text_size ||
1201 1201 addr - km->km_data_va < km->km_data_size ||
1202 1202 addr - km->km_bss_va < km->km_bss_size)
1203 1203 return (kmt_mod_to_map(km, &kmt->kmt_map));
1204 1204 }
1205 1205
1206 1206 (void) set_errno(EMDB_NOMAP);
1207 1207 return (NULL);
1208 1208 }
1209 1209
1210 1210 static kmt_module_t *
1211 1211 kmt_module_by_name(kmt_data_t *kmt, const char *name)
1212 1212 {
1213 1213 kmt_module_t *km;
1214 1214
1215 1215 for (km = mdb_list_next(&kmt->kmt_modlist); km != NULL;
1216 1216 km = mdb_list_next(km)) {
1217 1217 if (strcmp(name, km->km_name) == 0)
1218 1218 return (km);
1219 1219 }
1220 1220
1221 1221 return (NULL);
1222 1222 }
1223 1223
1224 1224 static const mdb_map_t *
1225 1225 kmt_name_to_map(mdb_tgt_t *t, const char *name)
1226 1226 {
1227 1227 kmt_data_t *kmt = t->t_data;
1228 1228 kmt_module_t *km;
1229 1229 mdb_map_t m;
1230 1230
1231 1231 /*
1232 1232 * If name is MDB_TGT_OBJ_EXEC, return the first module on the list,
1233 1233 * which will be unix since we keep kmt_modlist in load order.
1234 1234 */
1235 1235 if (name == MDB_TGT_OBJ_EXEC) {
1236 1236 return (kmt_mod_to_map(mdb_list_next(&kmt->kmt_modlist),
1237 1237 &m));
1238 1238 }
1239 1239
1240 1240 if (name == MDB_TGT_OBJ_RTLD)
1241 1241 name = kmt->kmt_rtld_name;
1242 1242
1243 1243 if ((km = kmt_module_by_name(kmt, name)) != NULL)
1244 1244 return (kmt_mod_to_map(km, &m));
1245 1245
1246 1246 (void) set_errno(EMDB_NOOBJ);
1247 1247 return (NULL);
1248 1248 }
1249 1249
1250 1250 static ctf_file_t *
1251 1251 kmt_load_ctfdata(mdb_tgt_t *t, kmt_module_t *km)
1252 1252 {
1253 1253 kmt_data_t *kmt = t->t_data;
1254 1254 int err;
1255 1255
1256 1256 if (km->km_ctfp != NULL)
1257 1257 return (km->km_ctfp);
1258 1258
1259 1259 if (km->km_ctf_va == NULL || km->km_symtab == NULL) {
1260 1260 (void) set_errno(EMDB_NOCTF);
1261 1261 return (NULL);
1262 1262 }
1263 1263
1264 1264 if ((km->km_ctfp = mdb_ctf_bufopen(km->km_ctf_va, km->km_ctf_size,
1265 1265 km->km_symtab_va, &km->km_symtab_hdr, km->km_strtab_va,
1266 1266 &km->km_strtab_hdr, &err)) == NULL) {
1267 1267 (void) set_errno(ctf_to_errno(err));
1268 1268 return (NULL);
1269 1269 }
1270 1270
1271 1271 mdb_dprintf(MDB_DBG_KMOD, "loaded %lu bytes of CTF data for %s\n",
1272 1272 (ulong_t)km->km_ctf_size, km->km_name);
1273 1273
1274 1274 if (ctf_parent_name(km->km_ctfp) != NULL) {
1275 1275 mdb_var_t *v;
1276 1276
1277 1277 if ((v = mdb_nv_lookup(&kmt->kmt_modules,
1278 1278 ctf_parent_name(km->km_ctfp))) != NULL) {
1279 1279 kmt_module_t *pm = mdb_nv_get_cookie(v);
1280 1280
1281 1281 if (pm->km_ctfp == NULL)
1282 1282 (void) kmt_load_ctfdata(t, pm);
1283 1283
1284 1284 if (pm->km_ctfp != NULL && ctf_import(km->km_ctfp,
1285 1285 pm->km_ctfp) == CTF_ERR) {
1286 1286 warn("failed to import parent types into "
1287 1287 "%s: %s\n", km->km_name,
1288 1288 ctf_errmsg(ctf_errno(km->km_ctfp)));
1289 1289 }
1290 1290 } else {
1291 1291 warn("failed to load CTF data for %s - parent %s not "
1292 1292 "loaded\n", km->km_name,
1293 1293 ctf_parent_name(km->km_ctfp));
1294 1294 }
1295 1295 }
1296 1296
1297 1297 return (km->km_ctfp);
1298 1298 }
1299 1299
1300 1300 ctf_file_t *
1301 1301 kmt_addr_to_ctf(mdb_tgt_t *t, uintptr_t addr)
1302 1302 {
1303 1303 kmt_data_t *kmt = t->t_data;
1304 1304 kmt_module_t *km;
1305 1305
1306 1306 for (km = mdb_list_next(&kmt->kmt_modlist); km != NULL;
1307 1307 km = mdb_list_next(km)) {
1308 1308 if (addr - km->km_text_va < km->km_text_size ||
1309 1309 addr - km->km_data_va < km->km_data_size ||
1310 1310 addr - km->km_bss_va < km->km_bss_size)
1311 1311 return (kmt_load_ctfdata(t, km));
1312 1312 }
1313 1313
1314 1314 return (kmdb_module_addr_to_ctf(addr));
1315 1315 }
1316 1316
1317 1317 ctf_file_t *
1318 1318 kmt_name_to_ctf(mdb_tgt_t *t, const char *name)
1319 1319 {
1320 1320 kmt_data_t *kt = t->t_data;
1321 1321 kmt_module_t *km;
1322 1322
1323 1323 if (name == MDB_TGT_OBJ_EXEC) {
1324 1324 name = KMT_CTFPARENT;
1325 1325 } else if (name == MDB_TGT_OBJ_RTLD) {
1326 1326 name = kt->kmt_rtld_name;
1327 1327 } else if (strncmp(name, "DMOD`", 5) == 0) {
1328 1328 /* Request for CTF data for a DMOD symbol */
1329 1329 return (kmdb_module_name_to_ctf(name + 5));
1330 1330 }
1331 1331
1332 1332 if ((km = kmt_module_by_name(kt, name)) != NULL)
1333 1333 return (kmt_load_ctfdata(t, km));
1334 1334
1335 1335 (void) set_errno(EMDB_NOOBJ);
1336 1336 return (NULL);
1337 1337 }
1338 1338
1339 1339 /*ARGSUSED*/
1340 1340 static int
1341 1341 kmt_status(mdb_tgt_t *t, mdb_tgt_status_t *tsp)
1342 1342 {
1343 1343 int state;
1344 1344
1345 1345 bzero(tsp, sizeof (mdb_tgt_status_t));
1346 1346
1347 1347 switch ((state = kmdb_dpi_get_state(NULL))) {
1348 1348 case DPI_STATE_INIT:
1349 1349 tsp->st_state = MDB_TGT_RUNNING;
1350 1350 tsp->st_pc = 0;
1351 1351 break;
1352 1352
1353 1353 case DPI_STATE_STOPPED:
1354 1354 tsp->st_state = MDB_TGT_STOPPED;
1355 1355
1356 1356 (void) kmdb_dpi_get_register("pc", &tsp->st_pc);
1357 1357 break;
1358 1358
1359 1359 case DPI_STATE_FAULTED:
1360 1360 tsp->st_state = MDB_TGT_STOPPED;
1361 1361
1362 1362 (void) kmdb_dpi_get_register("pc", &tsp->st_pc);
1363 1363
1364 1364 tsp->st_flags |= MDB_TGT_ISTOP;
1365 1365 break;
1366 1366
1367 1367 case DPI_STATE_LOST:
1368 1368 tsp->st_state = MDB_TGT_LOST;
1369 1369
1370 1370 (void) kmdb_dpi_get_register("pc", &tsp->st_pc);
1371 1371 break;
1372 1372 }
1373 1373
1374 1374 mdb_dprintf(MDB_DBG_KMOD, "kmt_status, dpi: %d tsp: %d, pc = %p %A\n",
1375 1375 state, tsp->st_state, (void *)tsp->st_pc, tsp->st_pc);
1376 1376
1377 1377 return (0);
1378 1378 }
1379 1379
1380 1380 /*
1381 1381 * Invoked when kmt_defbp_enter_debugger is called, this routine activates and
1382 1382 * deactivates deferred breakpoints in response to module load and unload
1383 1383 * events.
1384 1384 */
1385 1385 /*ARGSUSED*/
1386 1386 static void
1387 1387 kmt_defbp_event(mdb_tgt_t *t, int vid, void *private)
1388 1388 {
1389 1389 if (kmt_defbp_modchg_isload) {
1390 1390 if (!mdb_tgt_sespec_activate_all(t) &&
1391 1391 (mdb.m_flags & MDB_FL_BPTNOSYMSTOP)) {
1392 1392 /*
1393 1393 * We weren't able to activate the breakpoints.
1394 1394 * If so requested, we'll return without calling
1395 1395 * continue, thus throwing the user into the debugger.
1396 1396 */
1397 1397 return;
1398 1398 }
1399 1399
1400 1400 } else {
1401 1401 mdb_sespec_t *sep, *nsep;
1402 1402 const mdb_map_t *map, *bpmap;
1403 1403 mdb_map_t modmap;
1404 1404
1405 1405 if ((map = kmt_addr_to_map(t,
1406 1406 (uintptr_t)kmt_defbp_modchg_modctl->mod_text)) == NULL) {
1407 1407 warn("module unload notification for unknown module %s",
1408 1408 kmt_defbp_modchg_modctl->mod_modname);
1409 1409 return; /* drop into the debugger */
1410 1410 }
1411 1411
1412 1412 bcopy(map, &modmap, sizeof (mdb_map_t));
1413 1413
1414 1414 for (sep = mdb_list_next(&t->t_active); sep; sep = nsep) {
1415 1415 nsep = mdb_list_next(sep);
1416 1416
1417 1417 if (sep->se_ops == &kmt_brkpt_ops) {
1418 1418 kmt_brkpt_t *kb = sep->se_data;
1419 1419
1420 1420 if ((bpmap = kmt_addr_to_map(t,
1421 1421 kb->kb_addr)) == NULL ||
1422 1422 (bpmap->map_base == modmap.map_base &&
1423 1423 bpmap->map_size == modmap.map_size)) {
1424 1424 mdb_tgt_sespec_idle_one(t, sep,
1425 1425 EMDB_NOMAP);
1426 1426 }
1427 1427 }
1428 1428 }
1429 1429 }
1430 1430
1431 1431 (void) mdb_tgt_continue(t, NULL);
1432 1432 }
1433 1433
1434 1434 static void
1435 1435 kmt_defbp_enter_debugger(void)
1436 1436 {
1437 1437 /*
1438 1438 * The debugger places a breakpoint here. We can't have a simple
1439 1439 * nop function here, because GCC knows much more than we do, and
1440 1440 * will optimize away the call to it.
1441 1441 */
1442 1442 (void) get_fp();
1443 1443 }
1444 1444
1445 1445 /*
1446 1446 * This routine is called while the kernel is running. It attempts to determine
1447 1447 * whether any deferred breakpoints exist for the module being changed (loaded
1448 1448 * or unloaded). If any such breakpoints exist, the debugger will be entered to
1449 1449 * process them.
1450 1450 */
1451 1451 static void
1452 1452 kmt_defbp_modchg(struct modctl *mctl, int isload)
1453 1453 {
1454 1454 kmt_defbp_t *dbp;
1455 1455
1456 1456 kmt_defbp_lock = 1;
1457 1457
1458 1458 for (dbp = mdb_list_next(&kmt_defbp_list); dbp;
1459 1459 dbp = mdb_list_next(dbp)) {
1460 1460 if (!dbp->dbp_ref)
1461 1461 continue;
1462 1462
1463 1463 if (strcmp(mctl->mod_modname, dbp->dbp_objname) == 0) {
1464 1464 /*
1465 1465 * Activate the breakpoint
1466 1466 */
1467 1467 kmt_defbp_modchg_isload = isload;
1468 1468 kmt_defbp_modchg_modctl = mctl;
1469 1469
1470 1470 kmt_defbp_enter_debugger();
1471 1471 break;
1472 1472 }
1473 1473 }
1474 1474
1475 1475 kmt_defbp_lock = 0;
1476 1476 }
1477 1477
1478 1478 /*ARGSUSED*/
1479 1479 static int
1480 1480 kmt_continue(mdb_tgt_t *t, mdb_tgt_status_t *tsp)
1481 1481 {
1482 1482 int n;
1483 1483
1484 1484 kmdb_dpi_resume();
1485 1485
1486 1486 /*
1487 1487 * The order of the following two calls is important. If there are
1488 1488 * load acks on the work queue, we'll initialize the dmods they
1489 1489 * represent. This will involve a call to _mdb_init, which may very
1490 1490 * well result in a symbol lookup. If we haven't resynced our view
1491 1491 * of symbols with the current state of the world, this lookup could
1492 1492 * end very badly. We therefore make sure to sync before processing
1493 1493 * the work queue.
1494 1494 */
1495 1495 kmt_sync(t);
1496 1496 kmdb_dpi_process_work_queue();
1497 1497
1498 1498 if (kmdb_kdi_get_unload_request())
1499 1499 t->t_flags |= MDB_TGT_F_UNLOAD;
1500 1500
1501 1501 (void) mdb_tgt_status(t, &t->t_status);
1502 1502
1503 1503 if ((n = kmt_dmod_status(NULL, KMDB_MC_STATE_LOADING) +
1504 1504 kmt_dmod_status(NULL, KMDB_MC_STATE_UNLOADING)) != 0) {
1505 1505 mdb_warn("%d dmod load%c/unload%c pending\n", n,
1506 1506 "s"[n == 1], "s"[n == 1]);
1507 1507 }
1508 1508
1509 1509 return (0);
1510 1510 }
1511 1511
1512 1512 /*ARGSUSED*/
1513 1513 static int
1514 1514 kmt_step(mdb_tgt_t *t, mdb_tgt_status_t *tsp)
1515 1515 {
1516 1516 int rc;
1517 1517
1518 1518 if ((rc = kmdb_dpi_step()) == 0)
1519 1519 (void) mdb_tgt_status(t, &t->t_status);
1520 1520
1521 1521 return (rc);
1522 1522 }
1523 1523
1524 1524 static int
1525 1525 kmt_defbp_activate(mdb_tgt_t *t)
1526 1526 {
1527 1527 kmdb_dpi_modchg_register(kmt_defbp_modchg);
1528 1528
1529 1529 /*
1530 1530 * The routines that add and arm breakpoints will check for the proper
1531 1531 * DTrace state, but they'll just put this breakpoint on the idle list
1532 1532 * if DTrace is active. It'll correctly move to the active list when
1533 1533 * DTrace deactivates, but that's insufficient for our purposes -- we
1534 1534 * need to do extra processing at that point. We won't get to do said
1535 1535 * processing with with a normal idle->active transition, so we just
1536 1536 * won't add it add it until we're sure that it'll stick.
1537 1537 */
1538 1538
1539 1539 if (kmdb_kdi_dtrace_get_state() == KDI_DTSTATE_DTRACE_ACTIVE)
1540 1540 return (set_errno(EMDB_DTACTIVE));
1541 1541
1542 1542 kmt_defbp_bpspec = mdb_tgt_add_vbrkpt(t,
1543 1543 (uintptr_t)kmt_defbp_enter_debugger,
1544 1544 MDB_TGT_SPEC_HIDDEN, kmt_defbp_event, NULL);
1545 1545
1546 1546 return (0);
1547 1547 }
1548 1548
1549 1549 static void
1550 1550 kmt_defbp_deactivate(mdb_tgt_t *t)
1551 1551 {
1552 1552 kmdb_dpi_modchg_cancel();
1553 1553
1554 1554 if (kmt_defbp_bpspec != 0) {
1555 1555 if (t != NULL)
1556 1556 (void) mdb_tgt_vespec_delete(t, kmt_defbp_bpspec);
1557 1557
1558 1558 kmt_defbp_bpspec = 0;
1559 1559 }
1560 1560 }
1561 1561
1562 1562 static kmt_defbp_t *
1563 1563 kmt_defbp_create(mdb_tgt_t *t, const char *objname, const char *symname)
1564 1564 {
1565 1565 kmt_defbp_t *dbp = mdb_alloc(sizeof (kmt_defbp_t), UM_SLEEP);
1566 1566
1567 1567 mdb_dprintf(MDB_DBG_KMOD, "defbp_create %s`%s\n", objname, symname);
1568 1568
1569 1569 dbp->dbp_objname = strdup(objname);
1570 1570 dbp->dbp_symname = strdup(symname);
1571 1571 dbp->dbp_ref = 1;
1572 1572
1573 1573 kmt_defbp_num++;
1574 1574
1575 1575 if (kmt_defbp_num == 1 || kmt_defbp_bpspec == 0) {
1576 1576 if (kmt_defbp_activate(t) < 0)
1577 1577 warn("failed to activate deferred breakpoints");
1578 1578 }
1579 1579
1580 1580 mdb_list_append(&kmt_defbp_list, dbp);
1581 1581
1582 1582 return (dbp);
1583 1583 }
1584 1584
1585 1585 static void
1586 1586 kmt_defbp_destroy(kmt_defbp_t *dbp)
1587 1587 {
1588 1588 mdb_dprintf(MDB_DBG_KMOD, "defbp_destroy %s`%s\n", dbp->dbp_objname,
1589 1589 dbp->dbp_symname);
1590 1590
1591 1591 mdb_list_delete(&kmt_defbp_list, dbp);
1592 1592
1593 1593 strfree(dbp->dbp_objname);
1594 1594 strfree(dbp->dbp_symname);
1595 1595 mdb_free(dbp, sizeof (kmt_defbp_t));
1596 1596 }
1597 1597
1598 1598 static void
1599 1599 kmt_defbp_prune_common(int all)
1600 1600 {
1601 1601 kmt_defbp_t *dbp, *ndbp;
1602 1602
1603 1603 /* We can't remove items from the list while the driver is using it. */
1604 1604 if (kmt_defbp_lock)
1605 1605 return;
1606 1606
1607 1607 for (dbp = mdb_list_next(&kmt_defbp_list); dbp != NULL; dbp = ndbp) {
1608 1608 ndbp = mdb_list_next(dbp);
1609 1609
1610 1610 if (!all && dbp->dbp_ref)
1611 1611 continue;
1612 1612
1613 1613 kmt_defbp_destroy(dbp);
1614 1614 }
1615 1615 }
1616 1616
1617 1617 static void
1618 1618 kmt_defbp_prune(void)
1619 1619 {
1620 1620 kmt_defbp_prune_common(0);
1621 1621 }
1622 1622
1623 1623 static void
1624 1624 kmt_defbp_destroy_all(void)
1625 1625 {
1626 1626 kmt_defbp_prune_common(1);
1627 1627 }
1628 1628
1629 1629 static void
1630 1630 kmt_defbp_delete(mdb_tgt_t *t, kmt_defbp_t *dbp)
1631 1631 {
1632 1632 dbp->dbp_ref = 0;
1633 1633
1634 1634 ASSERT(kmt_defbp_num > 0);
1635 1635 kmt_defbp_num--;
1636 1636
1637 1637 if (kmt_defbp_num == 0)
1638 1638 kmt_defbp_deactivate(t);
1639 1639
1640 1640 kmt_defbp_prune();
1641 1641 }
1642 1642
1643 1643 static int
1644 1644 kmt_brkpt_ctor(mdb_tgt_t *t, mdb_sespec_t *sep, void *args)
1645 1645 {
1646 1646 mdb_tgt_status_t tsp;
1647 1647 kmt_bparg_t *ka = args;
1648 1648 kmt_brkpt_t *kb;
1649 1649 GElf_Sym s;
1650 1650 mdb_instr_t instr;
1651 1651
1652 1652 (void) mdb_tgt_status(t, &tsp);
1653 1653 if (tsp.st_state != MDB_TGT_RUNNING && tsp.st_state != MDB_TGT_STOPPED)
1654 1654 return (set_errno(EMDB_NOPROC));
1655 1655
1656 1656 if (ka->ka_symbol != NULL) {
1657 1657 if (mdb_tgt_lookup_by_scope(t, ka->ka_symbol, &s, NULL) == -1) {
1658 1658 if (errno != EMDB_NOOBJ && !(errno == EMDB_NOSYM &&
1659 1659 !(mdb.m_flags & MDB_FL_BPTNOSYMSTOP))) {
1660 1660 warn("breakpoint %s activation failed",
1661 1661 ka->ka_symbol);
1662 1662 }
1663 1663 return (-1); /* errno is set for us */
1664 1664 }
1665 1665
1666 1666 ka->ka_addr = (uintptr_t)s.st_value;
1667 1667 }
1668 1668
1669 1669 #ifdef __sparc
1670 1670 if (ka->ka_addr & 3)
1671 1671 return (set_errno(EMDB_BPALIGN));
1672 1672 #endif
1673 1673
1674 1674 if (mdb_vread(&instr, sizeof (instr), ka->ka_addr) != sizeof (instr))
1675 1675 return (-1); /* errno is set for us */
1676 1676
1677 1677 if (kmdb_kdi_dtrace_get_state() == KDI_DTSTATE_DTRACE_ACTIVE)
1678 1678 warn("breakpoint will not arm until DTrace is inactive\n");
1679 1679
1680 1680 kb = mdb_zalloc(sizeof (kmt_brkpt_t), UM_SLEEP);
1681 1681 kb->kb_addr = ka->ka_addr;
1682 1682 sep->se_data = kb;
1683 1683
1684 1684 return (0);
1685 1685 }
1686 1686
1687 1687 /*ARGSUSED*/
1688 1688 static void
1689 1689 kmt_brkpt_dtor(mdb_tgt_t *t, mdb_sespec_t *sep)
1690 1690 {
1691 1691 mdb_free(sep->se_data, sizeof (kmt_brkpt_t));
1692 1692 }
1693 1693
1694 1694 /*ARGSUSED*/
1695 1695 static char *
1696 1696 kmt_brkpt_info(mdb_tgt_t *t, mdb_sespec_t *sep, mdb_vespec_t *vep,
1697 1697 mdb_tgt_spec_desc_t *sp, char *buf, size_t nbytes)
1698 1698 {
1699 1699 uintptr_t addr = NULL;
1700 1700
1701 1701 if (vep != NULL) {
1702 1702 kmt_bparg_t *ka = vep->ve_args;
1703 1703
1704 1704 if (ka->ka_symbol != NULL) {
1705 1705 (void) mdb_iob_snprintf(buf, nbytes, "stop at %s",
1706 1706 ka->ka_symbol);
1707 1707 } else {
1708 1708 (void) mdb_iob_snprintf(buf, nbytes, "stop at %a",
1709 1709 ka->ka_addr);
1710 1710 addr = ka->ka_addr;
1711 1711 }
1712 1712
1713 1713 } else {
1714 1714 addr = ((kmt_brkpt_t *)sep->se_data)->kb_addr;
1715 1715 (void) mdb_iob_snprintf(buf, nbytes, "stop at %a", addr);
1716 1716 }
1717 1717
1718 1718 sp->spec_base = addr;
1719 1719 sp->spec_size = sizeof (mdb_instr_t);
1720 1720
1721 1721 return (buf);
1722 1722 }
1723 1723
1724 1724 static int
1725 1725 kmt_brkpt_secmp(mdb_tgt_t *t, mdb_sespec_t *sep, void *args)
1726 1726 {
1727 1727 kmt_brkpt_t *kb = sep->se_data;
1728 1728 kmt_bparg_t *ka = args;
1729 1729 GElf_Sym sym;
1730 1730
1731 1731 if (ka->ka_symbol != NULL) {
1732 1732 return (mdb_tgt_lookup_by_scope(t, ka->ka_symbol,
1733 1733 &sym, NULL) == 0 && sym.st_value == kb->kb_addr);
1734 1734 }
1735 1735
1736 1736 return (ka->ka_addr == kb->kb_addr);
1737 1737 }
1738 1738
1739 1739 /*ARGSUSED*/
1740 1740 static int
1741 1741 kmt_brkpt_vecmp(mdb_tgt_t *t, mdb_vespec_t *vep, void *args)
1742 1742 {
1743 1743 kmt_bparg_t *ka1 = vep->ve_args;
1744 1744 kmt_bparg_t *ka2 = args;
1745 1745
1746 1746 if (ka1->ka_symbol != NULL && ka2->ka_symbol != NULL)
1747 1747 return (strcmp(ka1->ka_symbol, ka2->ka_symbol) == 0);
1748 1748
1749 1749 if (ka1->ka_symbol == NULL && ka2->ka_symbol == NULL)
1750 1750 return (ka1->ka_addr == ka2->ka_addr);
1751 1751
1752 1752 return (0); /* fail if one is symbolic, other is an explicit address */
1753 1753 }
1754 1754
1755 1755 static int
1756 1756 kmt_brkpt_arm(mdb_tgt_t *t, mdb_sespec_t *sep)
1757 1757 {
1758 1758 kmt_data_t *kmt = t->t_data;
1759 1759 kmt_brkpt_t *kb = sep->se_data;
1760 1760 int rv;
1761 1761
1762 1762 if (kmdb_kdi_dtrace_get_state() == KDI_DTSTATE_DTRACE_ACTIVE)
1763 1763 return (set_errno(EMDB_DTACTIVE));
1764 1764
1765 1765 if ((rv = kmdb_dpi_brkpt_arm(kb->kb_addr, &kb->kb_oinstr)) != 0)
1766 1766 return (rv);
1767 1767
1768 1768 if (kmt->kmt_narmedbpts++ == 0)
1769 1769 (void) kmdb_kdi_dtrace_set(KDI_DTSET_KMDB_BPT_ACTIVATE);
1770 1770
1771 1771 return (0);
1772 1772 }
1773 1773
1774 1774 static int
1775 1775 kmt_brkpt_disarm(mdb_tgt_t *t, mdb_sespec_t *sep)
1776 1776 {
1777 1777 kmt_data_t *kmt = t->t_data;
1778 1778 kmt_brkpt_t *kb = sep->se_data;
1779 1779 int rv;
1780 1780
1781 1781 ASSERT(kmdb_kdi_dtrace_get_state() == KDI_DTSTATE_KMDB_BPT_ACTIVE);
1782 1782
1783 1783 if ((rv = kmdb_dpi_brkpt_disarm(kb->kb_addr, kb->kb_oinstr)) != 0)
1784 1784 return (rv);
1785 1785
1786 1786 if (--kmt->kmt_narmedbpts == 0)
1787 1787 (void) kmdb_kdi_dtrace_set(KDI_DTSET_KMDB_BPT_DEACTIVATE);
1788 1788
1789 1789 return (0);
1790 1790 }
1791 1791
1792 1792 /*
1793 1793 * Determine whether the specified sespec is an armed watchpoint that overlaps
1794 1794 * with the given breakpoint and has the given flags set. We use this to find
1795 1795 * conflicts with breakpoints, below.
1796 1796 */
1797 1797 static int
1798 1798 kmt_wp_overlap(mdb_sespec_t *sep, kmt_brkpt_t *kb, int flags)
1799 1799 {
1800 1800 const kmdb_wapt_t *wp = sep->se_data;
1801 1801
1802 1802 return (sep->se_state == MDB_TGT_SPEC_ARMED &&
1803 1803 sep->se_ops == &kmt_wapt_ops && (wp->wp_wflags & flags) &&
1804 1804 kb->kb_addr - wp->wp_addr < wp->wp_size);
1805 1805 }
1806 1806
1807 1807 /*
1808 1808 * We step over breakpoints using our single-stepper. If a conflicting
1809 1809 * watchpoint is present, we must temporarily remove it before stepping over the
1810 1810 * breakpoint so we don't immediately re-trigger the watchpoint. We know the
1811 1811 * watchpoint has already triggered on our trap instruction as part of fetching
1812 1812 * it. Before we return, we must re-install any disabled watchpoints.
1813 1813 */
1814 1814 static int
1815 1815 kmt_brkpt_cont(mdb_tgt_t *t, mdb_sespec_t *sep, mdb_tgt_status_t *tsp)
1816 1816 {
1817 1817 kmt_brkpt_t *kb = sep->se_data;
1818 1818 int status = -1;
1819 1819 int error;
1820 1820
1821 1821 for (sep = mdb_list_next(&t->t_active); sep; sep = mdb_list_next(sep)) {
1822 1822 if (kmt_wp_overlap(sep, kb, MDB_TGT_WA_X))
1823 1823 (void) kmdb_dpi_wapt_disarm(sep->se_data);
1824 1824 }
1825 1825
1826 1826 if (kmdb_dpi_brkpt_disarm(kb->kb_addr, kb->kb_oinstr) == 0 &&
1827 1827 kmt_step(t, tsp) == 0)
1828 1828 status = kmt_status(t, tsp);
1829 1829
1830 1830 error = errno; /* save errno from disarm, step, or status */
1831 1831
1832 1832 for (sep = mdb_list_next(&t->t_active); sep; sep = mdb_list_next(sep)) {
1833 1833 if (kmt_wp_overlap(sep, kb, MDB_TGT_WA_X))
1834 1834 kmdb_dpi_wapt_arm(sep->se_data);
1835 1835 }
1836 1836
1837 1837 (void) set_errno(error);
1838 1838 return (status);
1839 1839 }
1840 1840
1841 1841 /*ARGSUSED*/
1842 1842 static int
1843 1843 kmt_brkpt_match(mdb_tgt_t *t, mdb_sespec_t *sep, mdb_tgt_status_t *tsp)
1844 1844 {
1845 1845 kmt_brkpt_t *kb = sep->se_data;
1846 1846 int state, why;
1847 1847 kreg_t pc;
1848 1848
1849 1849 state = kmdb_dpi_get_state(&why);
1850 1850 (void) kmdb_dpi_get_register("pc", &pc);
1851 1851
1852 1852 return (state == DPI_STATE_FAULTED && why == DPI_STATE_WHY_BKPT &&
1853 1853 pc == kb->kb_addr);
1854 1854 }
1855 1855
1856 1856 static const mdb_se_ops_t kmt_brkpt_ops = {
1857 1857 kmt_brkpt_ctor, /* se_ctor */
1858 1858 kmt_brkpt_dtor, /* se_dtor */
1859 1859 kmt_brkpt_info, /* se_info */
1860 1860 kmt_brkpt_secmp, /* se_secmp */
1861 1861 kmt_brkpt_vecmp, /* se_vecmp */
1862 1862 kmt_brkpt_arm, /* se_arm */
1863 1863 kmt_brkpt_disarm, /* se_disarm */
1864 1864 kmt_brkpt_cont, /* se_cont */
1865 1865 kmt_brkpt_match /* se_match */
1866 1866 };
1867 1867
1868 1868 static int
1869 1869 kmt_wapt_ctor(mdb_tgt_t *t, mdb_sespec_t *sep, void *args)
1870 1870 {
1871 1871 mdb_tgt_status_t tsp;
1872 1872 kmdb_wapt_t *vwp = args;
1873 1873 kmdb_wapt_t *swp;
1874 1874
1875 1875 (void) mdb_tgt_status(t, &tsp);
1876 1876 if (tsp.st_state != MDB_TGT_RUNNING && tsp.st_state != MDB_TGT_STOPPED)
1877 1877 return (set_errno(EMDB_NOPROC));
1878 1878
1879 1879 swp = mdb_alloc(sizeof (kmdb_wapt_t), UM_SLEEP);
1880 1880 bcopy(vwp, swp, sizeof (kmdb_wapt_t));
1881 1881
1882 1882 if (kmdb_dpi_wapt_reserve(swp) < 0) {
1883 1883 mdb_free(swp, sizeof (kmdb_wapt_t));
1884 1884 return (-1); /* errno is set for us */
1885 1885 }
1886 1886
1887 1887 sep->se_data = swp;
1888 1888
1889 1889 return (0);
1890 1890 }
1891 1891
1892 1892 /*ARGSUSED*/
1893 1893 static void
1894 1894 kmt_wapt_dtor(mdb_tgt_t *t, mdb_sespec_t *sep)
1895 1895 {
1896 1896 kmdb_wapt_t *wp = sep->se_data;
1897 1897
1898 1898 kmdb_dpi_wapt_release(wp);
1899 1899 mdb_free(wp, sizeof (kmdb_wapt_t));
1900 1900 }
1901 1901
1902 1902 /*ARGSUSED*/
1903 1903 static char *
1904 1904 kmt_wapt_info(mdb_tgt_t *t, mdb_sespec_t *sep, mdb_vespec_t *vep,
1905 1905 mdb_tgt_spec_desc_t *sp, char *buf, size_t nbytes)
1906 1906 {
1907 1907 kmdb_wapt_t *wp = vep != NULL ? vep->ve_args : sep->se_data;
1908 1908 const char *fmt;
1909 1909 char desc[24];
1910 1910
1911 1911 ASSERT(wp->wp_wflags != 0);
1912 1912 desc[0] = '\0';
1913 1913
1914 1914 switch (wp->wp_wflags) {
1915 1915 case MDB_TGT_WA_R:
1916 1916 (void) strcat(desc, "/read");
1917 1917 break;
1918 1918 case MDB_TGT_WA_W:
1919 1919 (void) strcat(desc, "/write");
1920 1920 break;
1921 1921 case MDB_TGT_WA_X:
1922 1922 (void) strcat(desc, "/exec");
1923 1923 break;
1924 1924 default:
1925 1925 if (wp->wp_wflags & MDB_TGT_WA_R)
1926 1926 (void) strcat(desc, "/r");
1927 1927 if (wp->wp_wflags & MDB_TGT_WA_W)
1928 1928 (void) strcat(desc, "/w");
1929 1929 if (wp->wp_wflags & MDB_TGT_WA_X)
1930 1930 (void) strcat(desc, "/x");
1931 1931 }
1932 1932
1933 1933 switch (wp->wp_type) {
1934 1934 case DPI_WAPT_TYPE_PHYS:
1935 1935 fmt = "stop on %s of phys [%p, %p)";
1936 1936 break;
1937 1937
1938 1938 case DPI_WAPT_TYPE_VIRT:
1939 1939 fmt = "stop on %s of [%la, %la)";
1940 1940 break;
1941 1941
1942 1942 case DPI_WAPT_TYPE_IO:
1943 1943 if (wp->wp_size == 1)
1944 1944 fmt = "stop on %s of I/O port %p";
1945 1945 else
1946 1946 fmt = "stop on %s of I/O port [%p, %p)";
1947 1947 break;
1948 1948 }
1949 1949
1950 1950 (void) mdb_iob_snprintf(buf, nbytes, fmt, desc + 1, wp->wp_addr,
1951 1951 wp->wp_addr + wp->wp_size);
1952 1952
1953 1953 sp->spec_base = wp->wp_addr;
1954 1954 sp->spec_size = wp->wp_size;
1955 1955
1956 1956 return (buf);
1957 1957 }
1958 1958
1959 1959 /*ARGSUSED*/
1960 1960 static int
1961 1961 kmt_wapt_secmp(mdb_tgt_t *t, mdb_sespec_t *sep, void *args)
1962 1962 {
1963 1963 kmdb_wapt_t *wp1 = sep->se_data;
1964 1964 kmdb_wapt_t *wp2 = args;
1965 1965
1966 1966 return (wp1->wp_addr == wp2->wp_addr && wp1->wp_size == wp2->wp_size &&
1967 1967 wp1->wp_wflags == wp2->wp_wflags);
1968 1968 }
1969 1969
1970 1970 /*ARGSUSED*/
1971 1971 static int
1972 1972 kmt_wapt_vecmp(mdb_tgt_t *t, mdb_vespec_t *vep, void *args)
1973 1973 {
1974 1974 kmdb_wapt_t *wp1 = vep->ve_args;
1975 1975 kmdb_wapt_t *wp2 = args;
1976 1976
1977 1977 return (wp1->wp_addr == wp2->wp_addr && wp1->wp_size == wp2->wp_size &&
1978 1978 wp1->wp_wflags == wp2->wp_wflags);
1979 1979 }
1980 1980
1981 1981 /*ARGSUSED*/
1982 1982 static int
1983 1983 kmt_wapt_arm(mdb_tgt_t *t, mdb_sespec_t *sep)
1984 1984 {
1985 1985 kmdb_dpi_wapt_arm(sep->se_data);
1986 1986
1987 1987 return (0);
1988 1988 }
1989 1989
1990 1990 /*ARGSUSED*/
1991 1991 static int
1992 1992 kmt_wapt_disarm(mdb_tgt_t *t, mdb_sespec_t *sep)
1993 1993 {
1994 1994 kmdb_dpi_wapt_disarm(sep->se_data);
1995 1995
1996 1996 return (0);
1997 1997 }
1998 1998
1999 1999 /*
2000 2000 * Determine whether the specified sespec is an armed breakpoint at the given
2001 2001 * %pc. We use this to find conflicts with watchpoints below.
2002 2002 */
2003 2003 static int
2004 2004 kmt_bp_overlap(mdb_sespec_t *sep, uintptr_t pc)
2005 2005 {
2006 2006 kmt_brkpt_t *kb = sep->se_data;
2007 2007
2008 2008 return (sep->se_state == MDB_TGT_SPEC_ARMED &&
2009 2009 sep->se_ops == &kmt_brkpt_ops && kb->kb_addr == pc);
2010 2010 }
2011 2011
2012 2012 /*
2013 2013 * We step over watchpoints using our single-stepper. If a conflicting
2014 2014 * breakpoint is present, we must temporarily disarm it before stepping over
2015 2015 * the watchpoint so we do not immediately re-trigger the breakpoint. This is
2016 2016 * similar to the case handled in kmt_brkpt_cont(), above.
2017 2017 */
2018 2018 static int
2019 2019 kmt_wapt_cont(mdb_tgt_t *t, mdb_sespec_t *sep, mdb_tgt_status_t *tsp)
2020 2020 {
2021 2021 mdb_sespec_t *bep = NULL;
2022 2022 int status = -1;
2023 2023 int error, why;
2024 2024
2025 2025 /*
2026 2026 * If we stopped for anything other than a watchpoint, check to see
2027 2027 * if there's a breakpoint here.
2028 2028 */
2029 2029 if (!(kmdb_dpi_get_state(&why) == DPI_STATE_FAULTED &&
2030 2030 (why == DPI_STATE_WHY_V_WAPT || why == DPI_STATE_WHY_P_WAPT))) {
2031 2031 kreg_t pc;
2032 2032
2033 2033 (void) kmdb_dpi_get_register("pc", &pc);
2034 2034
2035 2035 for (bep = mdb_list_next(&t->t_active); bep != NULL;
2036 2036 bep = mdb_list_next(bep)) {
2037 2037 if (kmt_bp_overlap(bep, pc)) {
2038 2038 (void) bep->se_ops->se_disarm(t, bep);
2039 2039 bep->se_state = MDB_TGT_SPEC_ACTIVE;
2040 2040 break;
2041 2041 }
2042 2042 }
2043 2043 }
2044 2044
2045 2045 kmdb_dpi_wapt_disarm(sep->se_data);
2046 2046 if (kmt_step(t, tsp) == 0)
2047 2047 status = kmt_status(t, tsp);
2048 2048
2049 2049 error = errno; /* save errno from step or status */
2050 2050
2051 2051 if (bep != NULL)
2052 2052 mdb_tgt_sespec_arm_one(t, bep);
2053 2053
2054 2054 (void) set_errno(error);
2055 2055 return (status);
2056 2056 }
2057 2057
2058 2058 /*ARGSUSED*/
2059 2059 static int
2060 2060 kmt_wapt_match(mdb_tgt_t *t, mdb_sespec_t *sep, mdb_tgt_status_t *tsp)
2061 2061 {
2062 2062 return (kmdb_dpi_wapt_match(sep->se_data));
2063 2063 }
2064 2064
2065 2065 static const mdb_se_ops_t kmt_wapt_ops = {
2066 2066 kmt_wapt_ctor, /* se_ctor */
2067 2067 kmt_wapt_dtor, /* se_dtor */
2068 2068 kmt_wapt_info, /* se_info */
2069 2069 kmt_wapt_secmp, /* se_secmp */
2070 2070 kmt_wapt_vecmp, /* se_vecmp */
2071 2071 kmt_wapt_arm, /* se_arm */
2072 2072 kmt_wapt_disarm, /* se_disarm */
2073 2073 kmt_wapt_cont, /* se_cont */
2074 2074 kmt_wapt_match /* se_match */
2075 2075 };
2076 2076
2077 2077 /*ARGSUSED*/
2078 2078 static int
2079 2079 kmt_trap_ctor(mdb_tgt_t *t, mdb_sespec_t *sep, void *args)
2080 2080 {
2081 2081 sep->se_data = args; /* trap number */
2082 2082
2083 2083 return (0);
2084 2084 }
2085 2085
2086 2086 /*ARGSUSED*/
2087 2087 static char *
2088 2088 kmt_trap_info(mdb_tgt_t *t, mdb_sespec_t *sep, mdb_vespec_t *vep,
2089 2089 mdb_tgt_spec_desc_t *sp, char *buf, size_t nbytes)
2090 2090 {
2091 2091 const char *name;
2092 2092 int trapnum;
2093 2093
2094 2094 if (vep != NULL)
2095 2095 trapnum = (intptr_t)vep->ve_args;
2096 2096 else
2097 2097 trapnum = (intptr_t)sep->se_data;
2098 2098
2099 2099 if (trapnum == KMT_TRAP_ALL)
2100 2100 name = "any trap";
2101 2101 else if (trapnum == KMT_TRAP_NOTENUM)
2102 2102 name = "miscellaneous trap";
2103 2103 else
2104 2104 name = kmt_trapname(trapnum);
2105 2105
2106 2106 (void) mdb_iob_snprintf(buf, nbytes, "single-step stop on %s", name);
2107 2107
2108 2108 return (buf);
2109 2109 }
2110 2110
2111 2111 /*ARGSUSED2*/
2112 2112 static int
2113 2113 kmt_trap_match(mdb_tgt_t *t, mdb_sespec_t *sep, mdb_tgt_status_t *tsp)
2114 2114 {
2115 2115 int spectt = (intptr_t)sep->se_data;
2116 2116 kmt_data_t *kmt = t->t_data;
2117 2117 kreg_t tt;
2118 2118
2119 2119 (void) kmdb_dpi_get_register("tt", &tt);
2120 2120
2121 2121 switch (spectt) {
2122 2122 case KMT_TRAP_ALL:
2123 2123 return (1);
2124 2124 case KMT_TRAP_NOTENUM:
2125 2125 return (tt > kmt->kmt_trapmax ||
2126 2126 !BT_TEST(kmt->kmt_trapmap, tt));
2127 2127 default:
2128 2128 return (tt == spectt);
2129 2129 }
2130 2130 }
2131 2131
2132 2132 static const mdb_se_ops_t kmt_trap_ops = {
2133 2133 kmt_trap_ctor, /* se_ctor */
2134 2134 no_se_dtor, /* se_dtor */
2135 2135 kmt_trap_info, /* se_info */
2136 2136 no_se_secmp, /* se_secmp */
2137 2137 no_se_vecmp, /* se_vecmp */
2138 2138 no_se_arm, /* se_arm */
2139 2139 no_se_disarm, /* se_disarm */
2140 2140 no_se_cont, /* se_cont */
2141 2141 kmt_trap_match /* se_match */
2142 2142 };
2143 2143
2144 2144 static void
2145 2145 kmt_bparg_dtor(mdb_vespec_t *vep)
2146 2146 {
2147 2147 kmt_bparg_t *ka = vep->ve_args;
2148 2148
2149 2149 if (ka->ka_symbol != NULL)
2150 2150 strfree(ka->ka_symbol);
2151 2151
2152 2152 if (ka->ka_defbp != NULL)
2153 2153 kmt_defbp_delete(mdb.m_target, ka->ka_defbp);
2154 2154
2155 2155 mdb_free(ka, sizeof (kmt_bparg_t));
2156 2156 }
2157 2157
2158 2158 static int
2159 2159 kmt_add_vbrkpt(mdb_tgt_t *t, uintptr_t addr,
2160 2160 int spec_flags, mdb_tgt_se_f *func, void *data)
2161 2161 {
2162 2162 kmt_bparg_t *ka = mdb_alloc(sizeof (kmt_bparg_t), UM_SLEEP);
2163 2163
2164 2164 ka->ka_addr = addr;
2165 2165 ka->ka_symbol = NULL;
2166 2166 ka->ka_defbp = NULL;
2167 2167
2168 2168 return (mdb_tgt_vespec_insert(t, &kmt_brkpt_ops, spec_flags,
2169 2169 func, data, ka, kmt_bparg_dtor));
2170 2170 }
2171 2171
2172 2172 static int
2173 2173 kmt_add_sbrkpt(mdb_tgt_t *t, const char *fullname,
2174 2174 int spec_flags, mdb_tgt_se_f *func, void *data)
2175 2175 {
2176 2176 kmt_bparg_t *ka;
2177 2177 kmt_defbp_t *dbp;
2178 2178 GElf_Sym sym;
2179 2179 char *tick, *objname, *symname;
2180 2180 int serrno;
2181 2181
2182 2182 if ((tick = strchr(fullname, '`')) == fullname) {
2183 2183 (void) set_errno(EMDB_NOOBJ);
2184 2184 return (0);
2185 2185 }
2186 2186
2187 2187 /*
2188 2188 * Deferred breakpoints are always scoped. If we didn't find a tick,
2189 2189 * there's no scope. We'll create a vbrkpt, but only if we can turn the
2190 2190 * provided string into an address.
2191 2191 */
2192 2192 if (tick == NULL) {
2193 2193 uintptr_t addr;
2194 2194
2195 2195 if (strisbasenum(fullname)) {
2196 2196 addr = mdb_strtoull(fullname); /* a bare address */
2197 2197 } else if (mdb_tgt_lookup_by_name(t, MDB_TGT_OBJ_EVERY,
2198 2198 fullname, &sym, NULL) < 0) {
2199 2199 (void) set_errno(EMDB_NOSYM);
2200 2200 return (0);
2201 2201 } else {
2202 2202 addr = (uintptr_t)sym.st_value; /* unscoped sym name */
2203 2203 }
2204 2204
2205 2205 return (kmt_add_vbrkpt(t, addr, spec_flags, func, data));
2206 2206 }
2207 2207
2208 2208 if (*(tick + 1) == '\0') {
2209 2209 (void) set_errno(EMDB_NOSYM);
2210 2210 return (0);
2211 2211 }
2212 2212
2213 2213 objname = strndup(fullname, tick - fullname);
2214 2214 symname = tick + 1;
2215 2215
2216 2216 if (mdb_tgt_lookup_by_name(t, objname, symname, NULL, NULL) < 0 &&
2217 2217 errno != EMDB_NOOBJ) {
2218 2218 serrno = errno;
2219 2219 strfree(objname);
2220 2220
2221 2221 (void) set_errno(serrno);
2222 2222 return (0); /* errno is set for us */
2223 2223 }
2224 2224
2225 2225 dbp = kmt_defbp_create(t, objname, symname);
2226 2226 strfree(objname);
2227 2227
2228 2228 ka = mdb_alloc(sizeof (kmt_bparg_t), UM_SLEEP);
2229 2229 ka->ka_symbol = strdup(fullname);
2230 2230 ka->ka_addr = NULL;
2231 2231 ka->ka_defbp = dbp;
2232 2232
2233 2233 return (mdb_tgt_vespec_insert(t, &kmt_brkpt_ops, spec_flags,
2234 2234 func, data, ka, kmt_bparg_dtor));
2235 2235 }
2236 2236
2237 2237 static int
2238 2238 kmt_wparg_overlap(const kmdb_wapt_t *wp1, const kmdb_wapt_t *wp2)
2239 2239 {
2240 2240 /* Assume the watchpoint spaces don't overlap */
2241 2241 if (wp1->wp_type != wp2->wp_type)
2242 2242 return (0);
2243 2243
2244 2244 if (wp2->wp_addr + wp2->wp_size <= wp1->wp_addr)
2245 2245 return (0); /* no range overlap */
2246 2246
2247 2247 if (wp1->wp_addr + wp1->wp_size <= wp2->wp_addr)
2248 2248 return (0); /* no range overlap */
2249 2249
2250 2250 return (wp1->wp_addr != wp2->wp_addr || wp1->wp_size != wp2->wp_size ||
2251 2251 wp1->wp_wflags != wp2->wp_wflags);
2252 2252 }
2253 2253
2254 2254 static void
2255 2255 kmt_wparg_dtor(mdb_vespec_t *vep)
2256 2256 {
2257 2257 mdb_free(vep->ve_args, sizeof (kmdb_wapt_t));
2258 2258 }
2259 2259
2260 2260 static int
2261 2261 kmt_add_wapt_common(mdb_tgt_t *t, uintptr_t addr, size_t len, uint_t wflags,
2262 2262 int spec_flags, mdb_tgt_se_f *func, void *data, int type)
2263 2263 {
2264 2264 kmdb_wapt_t *wp = mdb_alloc(sizeof (kmdb_wapt_t), UM_SLEEP);
2265 2265 mdb_sespec_t *sep;
2266 2266
2267 2267 wp->wp_addr = addr;
2268 2268 wp->wp_size = len;
2269 2269 wp->wp_type = type;
2270 2270 wp->wp_wflags = wflags;
2271 2271
2272 2272 if (kmdb_dpi_wapt_validate(wp) < 0)
2273 2273 return (0); /* errno is set for us */
2274 2274
2275 2275 for (sep = mdb_list_next(&t->t_active); sep; sep = mdb_list_next(sep)) {
2276 2276 if (sep->se_ops == &kmt_wapt_ops &&
2277 2277 mdb_list_next(&sep->se_velist) != NULL &&
2278 2278 kmt_wparg_overlap(wp, sep->se_data))
2279 2279 goto wapt_dup;
2280 2280 }
2281 2281
2282 2282 for (sep = mdb_list_next(&t->t_idle); sep; sep = mdb_list_next(sep)) {
2283 2283 if (sep->se_ops == &kmt_wapt_ops && kmt_wparg_overlap(wp,
2284 2284 ((mdb_vespec_t *)mdb_list_next(&sep->se_velist))->ve_args))
2285 2285 goto wapt_dup;
2286 2286 }
2287 2287
2288 2288 return (mdb_tgt_vespec_insert(t, &kmt_wapt_ops, spec_flags,
2289 2289 func, data, wp, kmt_wparg_dtor));
2290 2290
2291 2291 wapt_dup:
2292 2292 mdb_free(wp, sizeof (kmdb_wapt_t));
2293 2293 (void) set_errno(EMDB_WPDUP);
2294 2294 return (0);
2295 2295 }
2296 2296
2297 2297 static int
2298 2298 kmt_add_pwapt(mdb_tgt_t *t, physaddr_t addr, size_t len, uint_t wflags,
2299 2299 int spec_flags, mdb_tgt_se_f *func, void *data)
2300 2300 {
2301 2301 return (kmt_add_wapt_common(t, (uintptr_t)addr, len, wflags, spec_flags,
2302 2302 func, data, DPI_WAPT_TYPE_PHYS));
2303 2303 }
2304 2304
2305 2305 static int
2306 2306 kmt_add_vwapt(mdb_tgt_t *t, uintptr_t addr, size_t len, uint_t wflags,
2307 2307 int spec_flags, mdb_tgt_se_f *func, void *data)
2308 2308 {
2309 2309 return (kmt_add_wapt_common(t, addr, len, wflags, spec_flags, func,
2310 2310 data, DPI_WAPT_TYPE_VIRT));
2311 2311 }
2312 2312
2313 2313 static int
2314 2314 kmt_add_iowapt(mdb_tgt_t *t, uintptr_t addr, size_t len, uint_t wflags,
2315 2315 int spec_flags, mdb_tgt_se_f *func, void *data)
2316 2316 {
2317 2317 return (kmt_add_wapt_common(t, addr, len, wflags, spec_flags, func,
2318 2318 data, DPI_WAPT_TYPE_IO));
2319 2319 }
2320 2320
2321 2321 static int
2322 2322 kmt_add_trap(mdb_tgt_t *t, int trapnum, int spec_flags, mdb_tgt_se_f *func,
2323 2323 void *data)
2324 2324 {
2325 2325 kmt_data_t *kmt = t->t_data;
2326 2326
2327 2327 if (trapnum != KMT_TRAP_ALL && trapnum != KMT_TRAP_NOTENUM) {
2328 2328 if (trapnum < 0 || trapnum > kmt->kmt_trapmax) {
2329 2329 (void) set_errno(EMDB_BADFLTNUM);
2330 2330 return (0);
2331 2331 }
2332 2332
2333 2333 BT_SET(kmt->kmt_trapmap, trapnum);
2334 2334 }
2335 2335
2336 2336 return (mdb_tgt_vespec_insert(t, &kmt_trap_ops, spec_flags, func, data,
2337 2337 (void *)(uintptr_t)trapnum, no_ve_dtor));
2338 2338 }
2339 2339
2340 2340 /*ARGSUSED*/
2341 2341 static uintmax_t
2342 2342 kmt_cpuid_disc_get(const mdb_var_t *v)
2343 2343 {
2344 2344 return (kmdb_dpi_get_master_cpuid());
2345 2345 }
2346 2346
2347 2347 static const mdb_nv_disc_t kmt_cpuid_disc = {
2348 2348 NULL,
2349 2349 kmt_cpuid_disc_get
2350 2350 };
2351 2351
2352 2352 /*
2353 2353 * This routine executes while the kernel is running.
2354 2354 */
2355 2355 void
2356 2356 kmt_activate(mdb_tgt_t *t)
2357 2357 {
2358 2358 kmt_data_t *kmt = t->t_data;
2359 2359
2360 2360 mdb_prop_postmortem = FALSE;
2361 2361 mdb_prop_kernel = TRUE;
2362 2362
2363 2363 (void) mdb_tgt_register_dcmds(t, &kmt_dcmds[0], MDB_MOD_FORCE);
2364 2364 mdb_tgt_register_regvars(t, kmt->kmt_rds, &kmt_reg_disc, 0);
2365 2365
2366 2366 /*
2367 2367 * Force load of the MDB krtld module, in case it's been rolled into
2368 2368 * unix.
2369 2369 */
2370 2370 (void) mdb_module_load(KMT_RTLD_NAME, MDB_MOD_SILENT | MDB_MOD_DEFER);
2371 2371 }
2372 2372
2373 2373 static void
2374 2374 kmt_destroy(mdb_tgt_t *t)
2375 2375 {
2376 2376 kmt_data_t *kmt = t->t_data;
2377 2377 kmt_module_t *km, *pkm;
2378 2378
2379 2379 mdb_nv_destroy(&kmt->kmt_modules);
2380 2380 for (km = mdb_list_prev(&kmt->kmt_modlist); km != NULL; km = pkm) {
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2381 2381 pkm = mdb_list_prev(km);
2382 2382 mdb_free(km, sizeof (kmt_module_t));
2383 2383 }
2384 2384
2385 2385 if (!kmt_defbp_lock)
2386 2386 kmt_defbp_destroy_all();
2387 2387
2388 2388 if (kmt->kmt_trapmap != NULL)
2389 2389 mdb_free(kmt->kmt_trapmap, BT_SIZEOFMAP(kmt->kmt_trapmax));
2390 2390
2391 - if (kmt != NULL)
2392 - mdb_free(kmt, sizeof (kmt_data_t));
2391 + mdb_free(kmt, sizeof (kmt_data_t));
2393 2392 }
2394 2393
2395 2394 static const mdb_tgt_ops_t kmt_ops = {
2396 2395 kmt_setflags, /* t_setflags */
2397 2396 (int (*)()) mdb_tgt_notsup, /* t_setcontext */
2398 2397 kmt_activate, /* t_activate */
2399 2398 (void (*)()) mdb_tgt_nop, /* t_deactivate */
2400 2399 kmt_periodic, /* t_periodic */
2401 2400 kmt_destroy, /* t_destroy */
2402 2401 kmt_name, /* t_name */
2403 2402 (const char *(*)()) mdb_conf_isa, /* t_isa */
2404 2403 kmt_platform, /* t_platform */
2405 2404 kmt_uname, /* t_uname */
2406 2405 kmt_dmodel, /* t_dmodel */
2407 2406 (ssize_t (*)()) mdb_tgt_notsup, /* t_aread */
2408 2407 (ssize_t (*)()) mdb_tgt_notsup, /* t_awrite */
2409 2408 kmt_read, /* t_vread */
2410 2409 kmt_write, /* t_vwrite */
2411 2410 kmt_pread, /* t_pread */
2412 2411 kmt_pwrite, /* t_pwrite */
2413 2412 kmt_read, /* t_fread */
2414 2413 kmt_write, /* t_fwrite */
2415 2414 kmt_ioread, /* t_ioread */
2416 2415 kmt_iowrite, /* t_iowrite */
2417 2416 kmt_vtop, /* t_vtop */
2418 2417 kmt_lookup_by_name, /* t_lookup_by_name */
2419 2418 kmt_lookup_by_addr, /* t_lookup_by_addr */
2420 2419 kmt_symbol_iter, /* t_symbol_iter */
2421 2420 kmt_mapping_iter, /* t_mapping_iter */
2422 2421 kmt_object_iter, /* t_object_iter */
2423 2422 kmt_addr_to_map, /* t_addr_to_map */
2424 2423 kmt_name_to_map, /* t_name_to_map */
2425 2424 kmt_addr_to_ctf, /* t_addr_to_ctf */
2426 2425 kmt_name_to_ctf, /* t_name_to_ctf */
2427 2426 kmt_status, /* t_status */
2428 2427 (int (*)()) mdb_tgt_notsup, /* t_run */
2429 2428 kmt_step, /* t_step */
2430 2429 kmt_step_out, /* t_step_out */
2431 2430 kmt_next, /* t_next */
2432 2431 kmt_continue, /* t_cont */
2433 2432 (int (*)()) mdb_tgt_notsup, /* t_signal */
2434 2433 kmt_add_vbrkpt, /* t_add_vbrkpt */
2435 2434 kmt_add_sbrkpt, /* t_add_sbrkpt */
2436 2435 kmt_add_pwapt, /* t_add_pwapt */
2437 2436 kmt_add_vwapt, /* t_add_vwapt */
2438 2437 kmt_add_iowapt, /* t_add_iowapt */
2439 2438 (int (*)()) mdb_tgt_null, /* t_add_sysenter */
2440 2439 (int (*)()) mdb_tgt_null, /* t_add_sysexit */
2441 2440 (int (*)()) mdb_tgt_null, /* t_add_signal */
2442 2441 kmt_add_trap, /* t_add_fault */
2443 2442 kmt_getareg, /* t_getareg */
2444 2443 kmt_putareg, /* t_putareg */
2445 2444 (int (*)()) mdb_tgt_nop, /* XXX t_stack_iter */
2446 2445 (int (*)()) mdb_tgt_notsup /* t_auxv */
2447 2446 };
2448 2447
2449 2448 /*
2450 2449 * Called immediately upon resumption of the system after a step or continue.
2451 2450 * Allows us to synchronize kmt's view of the world with reality.
2452 2451 */
2453 2452 /*ARGSUSED*/
2454 2453 static void
2455 2454 kmt_sync(mdb_tgt_t *t)
2456 2455 {
2457 2456 kmt_data_t *kmt = t->t_data;
2458 2457 int symavail;
2459 2458
2460 2459 mdb_dprintf(MDB_DBG_KMOD, "synchronizing with kernel\n");
2461 2460
2462 2461 symavail = kmt->kmt_symavail;
2463 2462 kmt->kmt_symavail = FALSE;
2464 2463
2465 2464 /*
2466 2465 * Resync our view of the world if the modules have changed, or if we
2467 2466 * didn't have any symbols coming into this function. The latter will
2468 2467 * only happen on startup.
2469 2468 */
2470 2469 if (kmdb_kdi_mods_changed() || !symavail)
2471 2470 kmt_modlist_update(t);
2472 2471
2473 2472 /*
2474 2473 * It would be nice if we could run this less frequently, perhaps
2475 2474 * after a dvec-initiated trigger.
2476 2475 */
2477 2476 kmdb_module_sync();
2478 2477
2479 2478 kmt->kmt_symavail = TRUE;
2480 2479
2481 2480 mdb_dprintf(MDB_DBG_KMOD, "synchronization complete\n");
2482 2481
2483 2482 kmt_defbp_prune();
2484 2483
2485 2484 if (kmt_defbp_num > 0 && kmt_defbp_bpspec == 0 &&
2486 2485 kmdb_kdi_dtrace_get_state() != KDI_DTSTATE_DTRACE_ACTIVE) {
2487 2486 /*
2488 2487 * Deferred breakpoints were created while DTrace was active,
2489 2488 * and consequently the deferred breakpoint enabling mechanism
2490 2489 * wasn't activated. Activate it now, and then try to activate
2491 2490 * the deferred breakpoints. We do this so that we can catch
2492 2491 * the ones which may apply to modules that have been loaded
2493 2492 * while they were waiting for DTrace to deactivate.
2494 2493 */
2495 2494 (void) kmt_defbp_activate(t);
2496 2495 (void) mdb_tgt_sespec_activate_all(t);
2497 2496 }
2498 2497
2499 2498 (void) mdb_tgt_status(t, &t->t_status);
2500 2499 }
2501 2500
2502 2501 /*
2503 2502 * This routine executes while the kernel is running.
2504 2503 */
2505 2504 /*ARGSUSED*/
2506 2505 int
2507 2506 kmdb_kvm_create(mdb_tgt_t *t, int argc, const char *argv[])
2508 2507 {
2509 2508 kmt_data_t *kmt;
2510 2509
2511 2510 if (argc != 0)
2512 2511 return (set_errno(EINVAL));
2513 2512
2514 2513 kmt = mdb_zalloc(sizeof (kmt_data_t), UM_SLEEP);
2515 2514 t->t_data = kmt;
2516 2515 t->t_ops = &kmt_ops;
2517 2516 t->t_flags |= MDB_TGT_F_RDWR; /* kmdb is always r/w */
2518 2517
2519 2518 (void) mdb_nv_insert(&mdb.m_nv, "cpuid", &kmt_cpuid_disc, 0,
2520 2519 MDB_NV_PERSIST | MDB_NV_RDONLY);
2521 2520
2522 2521 (void) mdb_nv_create(&kmt->kmt_modules, UM_SLEEP);
2523 2522
2524 2523 kmt_init_isadep(t);
2525 2524
2526 2525 kmt->kmt_symavail = FALSE;
2527 2526
2528 2527 bzero(&kmt_defbp_list, sizeof (mdb_list_t));
2529 2528
2530 2529 return (0);
2531 2530
2532 2531 create_err:
2533 2532 kmt_destroy(t);
2534 2533
2535 2534 return (-1);
2536 2535 }
2537 2536
2538 2537 /*
2539 2538 * This routine is called once, when kmdb first has control of the world.
2540 2539 */
2541 2540 void
2542 2541 kmdb_kvm_startup(void)
2543 2542 {
2544 2543 kmt_data_t *kmt = mdb.m_target->t_data;
2545 2544
2546 2545 mdb_dprintf(MDB_DBG_KMOD, "kmdb_kvm startup\n");
2547 2546
2548 2547 kmt_sync(mdb.m_target);
2549 2548 (void) mdb_module_load_builtin(KMT_MODULE);
2550 2549 kmt_startup_isadep(mdb.m_target);
2551 2550
2552 2551 /*
2553 2552 * This is here because we need to write the deferred breakpoint
2554 2553 * breakpoint when the debugger starts. Our normal r/o write routines
2555 2554 * don't work when the kernel is running, so we have to do it during
2556 2555 * startup.
2557 2556 */
2558 2557 (void) mdb_tgt_sespec_activate_all(mdb.m_target);
2559 2558
2560 2559 kmt->kmt_rtld_name = KMT_RTLD_NAME;
2561 2560
2562 2561 if (kmt_module_by_name(kmt, KMT_RTLD_NAME) == NULL)
2563 2562 kmt->kmt_rtld_name = "unix";
2564 2563 }
2565 2564
2566 2565 /*
2567 2566 * This routine is called after kmdb has loaded its initial set of modules.
2568 2567 */
2569 2568 void
2570 2569 kmdb_kvm_poststartup(void)
2571 2570 {
2572 2571 mdb_dprintf(MDB_DBG_KMOD, "kmdb_kvm post-startup\n");
2573 2572
2574 2573 (void) mdb_dis_select(kmt_def_dismode());
2575 2574 }
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