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