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 2009 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
24 */
25 /*
26 * Copyright (c) 2012 by Delphix. All rights reserved.
27 * Copyright (c) 2012 Joyent, Inc. All rights reserved.
28 */
29
30 /*
31 * Modular Debugger (MDB)
32 *
33 * Refer to the white paper "A Modular Debugger for Solaris" for information
34 * on the design, features, and goals of MDB. See /shared/sac/PSARC/1999/169
35 * for copies of the paper and related documentation.
36 *
37 * This file provides the basic construction and destruction of the debugger's
38 * global state, as well as the main execution loop, mdb_run(). MDB maintains
39 * a stack of execution frames (mdb_frame_t's) that keep track of its current
40 * state, including a stack of input and output buffers, walk and memory
41 * garbage collect lists, and a list of commands (mdb_cmd_t's). As the
42 * parser consumes input, it fills in a list of commands to execute, and then
43 * invokes mdb_call(), below. A command consists of a dcmd, telling us
44 * what function to execute, and a list of arguments and other invocation-
45 * specific data. Each frame may have more than one command, kept on a list,
46 * when multiple commands are separated by | operators. New frames may be
47 * stacked on old ones by nested calls to mdb_run: this occurs when, for
48 * example, in the middle of processing one input source (such as a file
49 * or the terminal), we invoke a dcmd that in turn calls mdb_eval(). mdb_eval
50 * will construct a new frame whose input source is the string passed to
51 * the eval function, and then execute this frame to completion.
52 */
53
54 #include <sys/param.h>
55 #include <stropts.h>
56
57 #define _MDB_PRIVATE
58 #include <mdb/mdb.h>
59
60 #include <mdb/mdb_context.h>
61 #include <mdb/mdb_argvec.h>
62 #include <mdb/mdb_signal.h>
63 #include <mdb/mdb_macalias.h>
64 #include <mdb/mdb_module.h>
65 #include <mdb/mdb_modapi.h>
66 #include <mdb/mdb_string.h>
67 #include <mdb/mdb_callb.h>
68 #include <mdb/mdb_debug.h>
69 #include <mdb/mdb_frame.h>
70 #include <mdb/mdb_conf.h>
71 #include <mdb/mdb_err.h>
72 #include <mdb/mdb_lex.h>
73 #include <mdb/mdb_io.h>
74 #include <mdb/mdb_ctf.h>
75 #ifdef _KMDB
76 #include <kmdb/kmdb_module.h>
77 #endif
78
79 /*
80 * Macro for testing if a dcmd's return status (x) indicates that we should
81 * abort the current loop or pipeline.
82 */
83 #define DCMD_ABORTED(x) ((x) == DCMD_USAGE || (x) == DCMD_ABORT)
84
85 extern const mdb_dcmd_t mdb_dcmd_builtins[];
86 extern mdb_dis_ctor_f *const mdb_dis_builtins[];
87
88 /*
89 * Variable discipline for toggling MDB_FL_PSYM based on the value of the
90 * undocumented '_' variable. Once adb(1) has been removed from the system,
91 * we should just remove this functionality and always disable PSYM for macros.
92 */
93 static uintmax_t
psym_disc_get(const mdb_var_t * v)94 psym_disc_get(const mdb_var_t *v)
95 {
96 int i = (mdb.m_flags & MDB_FL_PSYM) ? 1 : 0;
97 int j = (MDB_NV_VALUE(v) != 0) ? 1 : 0;
98
99 if ((i ^ j) == 0)
100 MDB_NV_VALUE((mdb_var_t *)v) = j ^ 1;
101
102 return (MDB_NV_VALUE(v));
103 }
104
105 static void
psym_disc_set(mdb_var_t * v,uintmax_t value)106 psym_disc_set(mdb_var_t *v, uintmax_t value)
107 {
108 if (value == 0)
109 mdb.m_flags |= MDB_FL_PSYM;
110 else
111 mdb.m_flags &= ~MDB_FL_PSYM;
112
113 MDB_NV_VALUE(v) = value;
114 }
115
116 /*
117 * Variable discipline for making <1 (most recent offset) behave properly.
118 */
119 static uintmax_t
roff_disc_get(const mdb_var_t * v)120 roff_disc_get(const mdb_var_t *v)
121 {
122 return (MDB_NV_VALUE(v));
123 }
124
125 static void
roff_disc_set(mdb_var_t * v,uintmax_t value)126 roff_disc_set(mdb_var_t *v, uintmax_t value)
127 {
128 mdb_nv_set_value(mdb.m_proffset, MDB_NV_VALUE(v));
129 MDB_NV_VALUE(v) = value;
130 }
131
132 /*
133 * Variable discipline for exporting the representative thread.
134 */
135 static uintmax_t
thr_disc_get(const mdb_var_t * v)136 thr_disc_get(const mdb_var_t *v)
137 {
138 mdb_tgt_status_t s;
139
140 if (mdb.m_target != NULL && mdb_tgt_status(mdb.m_target, &s) == 0)
141 return (s.st_tid);
142
143 return (MDB_NV_VALUE(v));
144 }
145
146 const char **
mdb_path_alloc(const char * s,size_t * newlen)147 mdb_path_alloc(const char *s, size_t *newlen)
148 {
149 char *format = mdb_alloc(strlen(s) * 2 + 1, UM_NOSLEEP);
150 const char **path;
151 char *p, *q;
152
153 struct utsname uts;
154 size_t len;
155 int i;
156
157 mdb_arg_t arg_i, arg_m, arg_p, arg_r, arg_t, arg_R, arg_V;
158 mdb_argvec_t argv;
159
160 static const char *empty_path[] = { NULL };
161
162 if (format == NULL)
163 goto nomem;
164
165 while (*s == ':')
166 s++; /* strip leading delimiters */
167
168 if (*s == '\0') {
169 *newlen = 0;
170 return (empty_path);
171 }
172
173 (void) strcpy(format, s);
174 mdb_argvec_create(&argv);
175
176 /*
177 * %i embedded in path string expands to ISA.
178 */
179 arg_i.a_type = MDB_TYPE_STRING;
180 if (mdb.m_target != NULL)
181 arg_i.a_un.a_str = mdb_tgt_isa(mdb.m_target);
182 else
183 arg_i.a_un.a_str = mdb_conf_isa();
184
185 /*
186 * %p embedded in path string expands to the platform name.
187 */
188 arg_p.a_type = MDB_TYPE_STRING;
189 if (mdb.m_target != NULL)
190 arg_p.a_un.a_str = mdb_tgt_platform(mdb.m_target);
191 else
192 arg_p.a_un.a_str = mdb_conf_platform();
193
194 /*
195 * %r embedded in path string expands to root directory, or
196 * to the empty string if root is "/" (to avoid // in paths).
197 */
198 arg_r.a_type = MDB_TYPE_STRING;
199 arg_r.a_un.a_str = strcmp(mdb.m_root, "/") ? mdb.m_root : "";
200
201 /*
202 * %t embedded in path string expands to the target name, defaulting to
203 * kvm; this is so we can find mdb_kb, which is used during bootstrap.
204 */
205 arg_t.a_type = MDB_TYPE_STRING;
206 arg_t.a_un.a_str = mdb.m_target ? mdb_tgt_name(mdb.m_target) : "kvm";
207
208 /*
209 * %R and %V expand to uname -r (release) and uname -v (version).
210 */
211 if (mdb.m_target == NULL || mdb_tgt_uname(mdb.m_target, &uts) < 0)
212 mdb_conf_uname(&uts);
213
214 arg_m.a_type = MDB_TYPE_STRING;
215 arg_m.a_un.a_str = uts.machine;
216
217 arg_R.a_type = MDB_TYPE_STRING;
218 arg_R.a_un.a_str = uts.release;
219
220 arg_V.a_type = MDB_TYPE_STRING;
221 if (mdb.m_flags & MDB_FL_LATEST)
222 arg_V.a_un.a_str = "latest";
223 else
224 arg_V.a_un.a_str = uts.version;
225
226 /*
227 * In order to expand the buffer, we examine the format string for
228 * our % tokens and construct an argvec, replacing each % token
229 * with %s along the way. If we encounter an unknown token, we
230 * shift over the remaining format buffer and stick in %%.
231 */
232 for (q = format; (q = strchr(q, '%')) != NULL; q++) {
233 switch (q[1]) {
234 case 'i':
235 mdb_argvec_append(&argv, &arg_i);
236 *++q = 's';
237 break;
238 case 'm':
239 mdb_argvec_append(&argv, &arg_m);
240 *++q = 's';
241 break;
242 case 'p':
243 mdb_argvec_append(&argv, &arg_p);
244 *++q = 's';
245 break;
246 case 'r':
247 mdb_argvec_append(&argv, &arg_r);
248 *++q = 's';
249 break;
250 case 't':
251 mdb_argvec_append(&argv, &arg_t);
252 *++q = 's';
253 break;
254 case 'R':
255 mdb_argvec_append(&argv, &arg_R);
256 *++q = 's';
257 break;
258 case 'V':
259 mdb_argvec_append(&argv, &arg_V);
260 *++q = 's';
261 break;
262 default:
263 bcopy(q + 1, q + 2, strlen(q));
264 *++q = '%';
265 }
266 }
267
268 /*
269 * We're now ready to use our printf engine to format the final string.
270 * Take one lap with a NULL buffer to determine how long the final
271 * string will be, allocate it, and format it.
272 */
273 len = mdb_iob_asnprintf(NULL, 0, format, argv.a_data);
274 if ((p = mdb_alloc(len + 1, UM_NOSLEEP)) != NULL)
275 (void) mdb_iob_asnprintf(p, len + 1, format, argv.a_data);
276 else
277 goto nomem;
278
279 mdb_argvec_zero(&argv);
280 mdb_argvec_destroy(&argv);
281
282 mdb_free(format, strlen(s) * 2 + 1);
283 format = NULL;
284
285 /*
286 * Compress the string to exclude any leading delimiters.
287 */
288 for (q = p; *q == ':'; q++)
289 continue;
290 if (q != p)
291 bcopy(q, p, strlen(q) + 1);
292
293 /*
294 * Count up the number of delimited elements. A sequence of
295 * consecutive delimiters is only counted once.
296 */
297 for (i = 1, q = p; (q = strchr(q, ':')) != NULL; i++) {
298 while (*q == ':')
299 q++;
300 }
301
302 if ((path = mdb_alloc(sizeof (char *) * (i + 1), UM_NOSLEEP)) == NULL) {
303 mdb_free(p, len + 1);
304 goto nomem;
305 }
306
307 for (i = 0, q = strtok(p, ":"); q != NULL; q = strtok(NULL, ":"))
308 path[i++] = q;
309
310 path[i] = NULL;
311 *newlen = len + 1;
312 return (path);
313
314 nomem:
315 warn("failed to allocate memory for path");
316 if (format != NULL)
317 mdb_free(format, strlen(s) * 2 + 1);
318 *newlen = 0;
319 return (empty_path);
320 }
321
322 const char **
mdb_path_dup(const char * path[],size_t pathlen,size_t * npathlenp)323 mdb_path_dup(const char *path[], size_t pathlen, size_t *npathlenp)
324 {
325 char **npath;
326 int i, j;
327
328 for (i = 0; path[i] != NULL; i++)
329 continue; /* count the path elements */
330
331 npath = mdb_zalloc(sizeof (char *) * (i + 1), UM_SLEEP);
332 if (pathlen > 0) {
333 npath[0] = mdb_alloc(pathlen, UM_SLEEP);
334 bcopy(path[0], npath[0], pathlen);
335 }
336
337 for (j = 1; j < i; j++)
338 npath[j] = npath[0] + (path[j] - path[0]);
339 npath[i] = NULL;
340
341 *npathlenp = pathlen;
342 return ((const char **)npath);
343 }
344
345 void
mdb_path_free(const char * path[],size_t pathlen)346 mdb_path_free(const char *path[], size_t pathlen)
347 {
348 int i;
349
350 for (i = 0; path[i] != NULL; i++)
351 continue; /* count the path elements */
352
353 if (i > 0) {
354 mdb_free((void *)path[0], pathlen);
355 mdb_free(path, sizeof (char *) * (i + 1));
356 }
357 }
358
359 /*
360 * Convert path string "s" to canonical form, expanding any %o tokens that are
361 * found within the path. The old path string is specified by "path", a buffer
362 * of size MAXPATHLEN which is then overwritten with the new path string.
363 */
364 static const char *
path_canon(char * path,const char * s)365 path_canon(char *path, const char *s)
366 {
367 char *p = path;
368 char *q = p + MAXPATHLEN - 1;
369
370 char old[MAXPATHLEN];
371 char c;
372
373 (void) strcpy(old, p);
374 *q = '\0';
375
376 while (p < q && (c = *s++) != '\0') {
377 if (c == '%') {
378 if ((c = *s++) == 'o') {
379 (void) strncpy(p, old, (size_t)(q - p));
380 p += strlen(p);
381 } else {
382 *p++ = '%';
383 if (p < q && c != '\0')
384 *p++ = c;
385 else
386 break;
387 }
388 } else
389 *p++ = c;
390 }
391
392 *p = '\0';
393 return (path);
394 }
395
396 void
mdb_set_ipath(const char * path)397 mdb_set_ipath(const char *path)
398 {
399 if (mdb.m_ipath != NULL)
400 mdb_path_free(mdb.m_ipath, mdb.m_ipathlen);
401
402 path = path_canon(mdb.m_ipathstr, path);
403 mdb.m_ipath = mdb_path_alloc(path, &mdb.m_ipathlen);
404 }
405
406 void
mdb_set_lpath(const char * path)407 mdb_set_lpath(const char *path)
408 {
409 if (mdb.m_lpath != NULL)
410 mdb_path_free(mdb.m_lpath, mdb.m_lpathlen);
411
412 path = path_canon(mdb.m_lpathstr, path);
413 mdb.m_lpath = mdb_path_alloc(path, &mdb.m_lpathlen);
414
415 #ifdef _KMDB
416 kmdb_module_path_set(mdb.m_lpath, mdb.m_lpathlen);
417 #endif
418 }
419
420 static void
prompt_update(void)421 prompt_update(void)
422 {
423 (void) mdb_snprintf(mdb.m_prompt, sizeof (mdb.m_prompt),
424 mdb.m_promptraw);
425 mdb.m_promptlen = strlen(mdb.m_prompt);
426 }
427
428 const char *
mdb_get_prompt(void)429 mdb_get_prompt(void)
430 {
431 if (mdb.m_promptlen == 0)
432 return (NULL);
433 else
434 return (mdb.m_prompt);
435 }
436
437 int
mdb_set_prompt(const char * p)438 mdb_set_prompt(const char *p)
439 {
440 size_t len = strlen(p);
441
442 if (len > MDB_PROMPTLEN) {
443 warn("prompt may not exceed %d characters\n", MDB_PROMPTLEN);
444 return (0);
445 }
446
447 (void) strcpy(mdb.m_promptraw, p);
448 prompt_update();
449 return (1);
450 }
451
452 static mdb_frame_t frame0;
453
454 void
mdb_create(const char * execname,const char * arg0)455 mdb_create(const char *execname, const char *arg0)
456 {
457 static const mdb_nv_disc_t psym_disc = { psym_disc_set, psym_disc_get };
458 static const mdb_nv_disc_t roff_disc = { roff_disc_set, roff_disc_get };
459 static const mdb_nv_disc_t thr_disc = { NULL, thr_disc_get };
460
461 static char rootdir[MAXPATHLEN];
462
463 const mdb_dcmd_t *dcp;
464 int i;
465
466 bzero(&mdb, sizeof (mdb_t));
467
468 mdb.m_flags = MDB_FL_PSYM | MDB_FL_PAGER | MDB_FL_BPTNOSYMSTOP |
469 MDB_FL_READBACK;
470 mdb.m_radix = MDB_DEF_RADIX;
471 mdb.m_nargs = MDB_DEF_NARGS;
472 mdb.m_histlen = MDB_DEF_HISTLEN;
473 mdb.m_armemlim = MDB_DEF_ARRMEM;
474 mdb.m_arstrlim = MDB_DEF_ARRSTR;
475
476 mdb.m_pname = strbasename(arg0);
477 if (strcmp(mdb.m_pname, "adb") == 0) {
478 mdb.m_flags |= MDB_FL_NOMODS | MDB_FL_ADB | MDB_FL_REPLAST;
479 mdb.m_flags &= ~MDB_FL_PAGER;
480 }
481
482 mdb.m_ipathstr = mdb_zalloc(MAXPATHLEN, UM_SLEEP);
483 mdb.m_lpathstr = mdb_zalloc(MAXPATHLEN, UM_SLEEP);
484
485 (void) strncpy(rootdir, execname, sizeof (rootdir));
486 rootdir[sizeof (rootdir) - 1] = '\0';
487 (void) strdirname(rootdir);
488
489 if (strcmp(strbasename(rootdir), "sparcv9") == 0 ||
490 strcmp(strbasename(rootdir), "sparcv7") == 0 ||
491 strcmp(strbasename(rootdir), "amd64") == 0 ||
492 strcmp(strbasename(rootdir), "i86") == 0)
493 (void) strdirname(rootdir);
494
495 if (strcmp(strbasename(rootdir), "bin") == 0) {
496 (void) strdirname(rootdir);
497 if (strcmp(strbasename(rootdir), "usr") == 0)
498 (void) strdirname(rootdir);
499 } else
500 (void) strcpy(rootdir, "/");
501
502 mdb.m_root = rootdir;
503
504 mdb.m_rminfo.mi_dvers = MDB_API_VERSION;
505 mdb.m_rminfo.mi_dcmds = mdb_dcmd_builtins;
506 mdb.m_rminfo.mi_walkers = NULL;
507
508 (void) mdb_nv_create(&mdb.m_rmod.mod_walkers, UM_SLEEP);
509 (void) mdb_nv_create(&mdb.m_rmod.mod_dcmds, UM_SLEEP);
510
511 mdb.m_rmod.mod_name = mdb.m_pname;
512 mdb.m_rmod.mod_info = &mdb.m_rminfo;
513
514 (void) mdb_nv_create(&mdb.m_disasms, UM_SLEEP);
515 (void) mdb_nv_create(&mdb.m_modules, UM_SLEEP);
516 (void) mdb_nv_create(&mdb.m_dcmds, UM_SLEEP);
517 (void) mdb_nv_create(&mdb.m_walkers, UM_SLEEP);
518 (void) mdb_nv_create(&mdb.m_nv, UM_SLEEP);
519
520 mdb.m_dot = mdb_nv_insert(&mdb.m_nv, ".", NULL, 0, MDB_NV_PERSIST);
521 mdb.m_rvalue = mdb_nv_insert(&mdb.m_nv, "0", NULL, 0, MDB_NV_PERSIST);
522
523 mdb.m_roffset =
524 mdb_nv_insert(&mdb.m_nv, "1", &roff_disc, 0, MDB_NV_PERSIST);
525
526 mdb.m_proffset = mdb_nv_insert(&mdb.m_nv, "2", NULL, 0, MDB_NV_PERSIST);
527 mdb.m_rcount = mdb_nv_insert(&mdb.m_nv, "9", NULL, 0, MDB_NV_PERSIST);
528
529 (void) mdb_nv_insert(&mdb.m_nv, "b", NULL, 0, MDB_NV_PERSIST);
530 (void) mdb_nv_insert(&mdb.m_nv, "d", NULL, 0, MDB_NV_PERSIST);
531 (void) mdb_nv_insert(&mdb.m_nv, "e", NULL, 0, MDB_NV_PERSIST);
532 (void) mdb_nv_insert(&mdb.m_nv, "m", NULL, 0, MDB_NV_PERSIST);
533 (void) mdb_nv_insert(&mdb.m_nv, "t", NULL, 0, MDB_NV_PERSIST);
534 (void) mdb_nv_insert(&mdb.m_nv, "_", &psym_disc, 0, MDB_NV_PERSIST);
535 (void) mdb_nv_insert(&mdb.m_nv, "hits", NULL, 0, MDB_NV_PERSIST);
536
537 (void) mdb_nv_insert(&mdb.m_nv, "thread", &thr_disc, 0,
538 MDB_NV_PERSIST | MDB_NV_RDONLY);
539
540 mdb.m_prsym = mdb_gelf_symtab_create_mutable();
541
542 (void) mdb_nv_insert(&mdb.m_modules, mdb.m_pname, NULL,
543 (uintptr_t)&mdb.m_rmod, MDB_NV_RDONLY);
544
545 for (dcp = &mdb_dcmd_builtins[0]; dcp->dc_name != NULL; dcp++)
546 (void) mdb_module_add_dcmd(&mdb.m_rmod, dcp, 0);
547
548 for (i = 0; mdb_dis_builtins[i] != NULL; i++)
549 (void) mdb_dis_create(mdb_dis_builtins[i]);
550
551 mdb_macalias_create();
552
553 mdb_create_builtin_tgts();
554
555 (void) mdb_callb_add(NULL, MDB_CALLB_PROMPT, (mdb_callb_f)prompt_update,
556 NULL);
557
558 /*
559 * The call to ctf_create that this does can in fact fail, but that's
560 * okay. All of the ctf functions that might use the synthetic types
561 * make sure that this is safe.
562 */
563 (void) mdb_ctf_synthetics_init();
564
565 #ifdef _KMDB
566 (void) mdb_nv_create(&mdb.m_dmodctl, UM_SLEEP);
567 #endif
568 mdb_lex_state_create(&frame0);
569
570 mdb_list_append(&mdb.m_flist, &frame0);
571 mdb.m_frame = &frame0;
572 }
573
574 void
mdb_destroy(void)575 mdb_destroy(void)
576 {
577 const mdb_dcmd_t *dcp;
578 mdb_var_t *v;
579 int unload_mode = MDB_MOD_SILENT;
580
581 #ifdef _KMDB
582 unload_mode |= MDB_MOD_DEFER;
583 #endif
584
585 mdb_intr_disable();
586
587 mdb_ctf_synthetics_fini();
588
589 mdb_macalias_destroy();
590
591 /*
592 * Some targets use modules during ->t_destroy, so do it first.
593 */
594 if (mdb.m_target != NULL)
595 (void) mdb_tgt_destroy(mdb.m_target);
596
597 /*
598 * Unload modules _before_ destroying the disassemblers since a
599 * module that installs a disassembler should try to clean up after
600 * itself.
601 */
602 mdb_module_unload_all(unload_mode);
603
604 mdb_nv_rewind(&mdb.m_disasms);
605 while ((v = mdb_nv_advance(&mdb.m_disasms)) != NULL)
606 mdb_dis_destroy(mdb_nv_get_cookie(v));
607
608 mdb_callb_remove_all();
609
610 if (mdb.m_defdisasm != NULL)
611 strfree(mdb.m_defdisasm);
612
613 if (mdb.m_prsym != NULL)
614 mdb_gelf_symtab_destroy(mdb.m_prsym);
615
616 for (dcp = &mdb_dcmd_builtins[0]; dcp->dc_name != NULL; dcp++)
617 (void) mdb_module_remove_dcmd(&mdb.m_rmod, dcp->dc_name);
618
619 mdb_nv_destroy(&mdb.m_nv);
620 mdb_nv_destroy(&mdb.m_walkers);
621 mdb_nv_destroy(&mdb.m_dcmds);
622 mdb_nv_destroy(&mdb.m_modules);
623 mdb_nv_destroy(&mdb.m_disasms);
624
625 mdb_free(mdb.m_ipathstr, MAXPATHLEN);
626 mdb_free(mdb.m_lpathstr, MAXPATHLEN);
627
628 if (mdb.m_ipath != NULL)
629 mdb_path_free(mdb.m_ipath, mdb.m_ipathlen);
630
631 if (mdb.m_lpath != NULL)
632 mdb_path_free(mdb.m_lpath, mdb.m_lpathlen);
633
634 if (mdb.m_in != NULL)
635 mdb_iob_destroy(mdb.m_in);
636
637 mdb_iob_destroy(mdb.m_out);
638 mdb.m_out = NULL;
639 mdb_iob_destroy(mdb.m_err);
640 mdb.m_err = NULL;
641
642 if (mdb.m_log != NULL)
643 mdb_io_rele(mdb.m_log);
644
645 mdb_lex_state_destroy(&frame0);
646 }
647
648 /*
649 * The real main loop of the debugger: create a new execution frame on the
650 * debugger stack, and while we have input available, call into the parser.
651 */
652 int
mdb_run(void)653 mdb_run(void)
654 {
655 volatile int err;
656 mdb_frame_t f;
657
658 mdb_intr_disable();
659 mdb_frame_push(&f);
660
661 /*
662 * This is a fresh mdb context, so ignore any pipe command we may have
663 * inherited from the previous frame.
664 */
665 f.f_pcmd = NULL;
666
667 if ((err = setjmp(f.f_pcb)) != 0) {
668 int pop = (mdb.m_in != NULL &&
669 (mdb_iob_isapipe(mdb.m_in) || mdb_iob_isastr(mdb.m_in)));
670 int fromcmd = (f.f_cp != NULL);
671
672 mdb_dprintf(MDB_DBG_DSTK, "frame <%u> caught event %s\n",
673 f.f_id, mdb_err2str(err));
674
675 /*
676 * If a syntax error or other failure has occurred, pop all
677 * input buffers pushed by commands executed in this frame.
678 */
679 while (mdb_iob_stack_size(&f.f_istk) != 0) {
680 if (mdb.m_in != NULL)
681 mdb_iob_destroy(mdb.m_in);
682 mdb.m_in = mdb_iob_stack_pop(&f.f_istk);
683 yylineno = mdb_iob_lineno(mdb.m_in);
684 }
685
686 /*
687 * Reset standard output and the current frame to a known,
688 * clean state, so we can continue execution.
689 */
690 mdb_iob_margin(mdb.m_out, MDB_IOB_DEFMARGIN);
691 mdb_iob_clrflags(mdb.m_out, MDB_IOB_INDENT);
692 mdb_iob_discard(mdb.m_out);
693 mdb_frame_reset(&f);
694
695 /*
696 * If there was an error writing to output, display a warning
697 * message if this is the topmost frame.
698 */
699 if (err == MDB_ERR_OUTPUT && mdb.m_depth == 1 && errno != EPIPE)
700 mdb_warn("write failed");
701
702 /*
703 * If an interrupt or quit signal is reported, we may have been
704 * in the middle of typing or processing the command line:
705 * print a newline and discard everything in the parser's iob.
706 * Note that we do this after m_out has been reset, otherwise
707 * we could trigger a pipe context switch or cause a write
708 * to a broken pipe (in the case of a shell command) when
709 * writing the newline.
710 */
711 if (err == MDB_ERR_SIGINT || err == MDB_ERR_QUIT) {
712 mdb_iob_nl(mdb.m_out);
713 yydiscard();
714 }
715
716 /*
717 * If we quit or abort using the output pager, reset the
718 * line count on standard output back to zero.
719 */
720 if (err == MDB_ERR_PAGER || MDB_ERR_IS_FATAL(err))
721 mdb_iob_clearlines(mdb.m_out);
722
723 /*
724 * If the user requested the debugger quit or abort back to
725 * the top, or if standard input is a pipe or mdb_eval("..."),
726 * then propagate the error up the debugger stack.
727 */
728 if (MDB_ERR_IS_FATAL(err) || pop != 0 ||
729 (err == MDB_ERR_PAGER && mdb.m_fmark != &f) ||
730 (err == MDB_ERR_NOMEM && !fromcmd)) {
731 mdb_frame_pop(&f, err);
732 return (err);
733 }
734
735 /*
736 * If we've returned here from a context where signals were
737 * blocked (e.g. a signal handler), we can now unblock them.
738 */
739 if (err == MDB_ERR_SIGINT)
740 (void) mdb_signal_unblock(SIGINT);
741 } else
742 mdb_intr_enable();
743
744 for (;;) {
745 while (mdb.m_in != NULL && (mdb_iob_getflags(mdb.m_in) &
746 (MDB_IOB_ERR | MDB_IOB_EOF)) == 0) {
747 if (mdb.m_depth == 1 &&
748 mdb_iob_stack_size(&f.f_istk) == 0) {
749 mdb_iob_clearlines(mdb.m_out);
750 mdb_tgt_periodic(mdb.m_target);
751 }
752
753 (void) yyparse();
754 }
755
756 if (mdb.m_in != NULL) {
757 if (mdb_iob_err(mdb.m_in)) {
758 warn("error reading input stream %s\n",
759 mdb_iob_name(mdb.m_in));
760 }
761 mdb_iob_destroy(mdb.m_in);
762 mdb.m_in = NULL;
763 }
764
765 if (mdb_iob_stack_size(&f.f_istk) == 0)
766 break; /* return when we're out of input */
767
768 mdb.m_in = mdb_iob_stack_pop(&f.f_istk);
769 yylineno = mdb_iob_lineno(mdb.m_in);
770 }
771
772 mdb_frame_pop(&f, 0);
773
774 /*
775 * The value of '.' is a per-frame attribute, to preserve it properly
776 * when switching frames. But in the case of calling mdb_run()
777 * explicitly (such as through mdb_eval), we want to propagate the value
778 * of '.' to the parent.
779 */
780 mdb_nv_set_value(mdb.m_dot, f.f_dot);
781
782 return (0);
783 }
784
785 /*
786 * The read-side of the pipe executes this service routine. We simply call
787 * mdb_run to create a new frame on the execution stack and run the MDB parser,
788 * and then propagate any error code back to the previous frame.
789 */
790 static int
runsvc(void)791 runsvc(void)
792 {
793 int err = mdb_run();
794
795 if (err != 0) {
796 mdb_dprintf(MDB_DBG_DSTK, "forwarding error %s from pipeline\n",
797 mdb_err2str(err));
798 longjmp(mdb.m_frame->f_pcb, err);
799 }
800
801 return (err);
802 }
803
804 /*
805 * Read-side pipe service routine: if we longjmp here, just return to the read
806 * routine because now we have more data to consume. Otherwise:
807 * (1) if ctx_data is non-NULL, longjmp to the write-side to produce more data;
808 * (2) if wriob is NULL, there is no writer but this is the first read, so we
809 * can just execute mdb_run() to completion on the current stack;
810 * (3) if (1) and (2) are false, then there is a writer and this is the first
811 * read, so create a co-routine context to execute mdb_run().
812 */
813 /*ARGSUSED*/
814 static void
rdsvc(mdb_iob_t * rdiob,mdb_iob_t * wriob,mdb_iob_ctx_t * ctx)815 rdsvc(mdb_iob_t *rdiob, mdb_iob_t *wriob, mdb_iob_ctx_t *ctx)
816 {
817 if (setjmp(ctx->ctx_rpcb) == 0) {
818 /*
819 * Save the current standard input into the pipe context, and
820 * reset m_in to point to the pipe. We will restore it on
821 * the way back in wrsvc() below.
822 */
823 ctx->ctx_iob = mdb.m_in;
824 mdb.m_in = rdiob;
825
826 ctx->ctx_rptr = mdb.m_frame;
827 if (ctx->ctx_wptr != NULL)
828 mdb_frame_switch(ctx->ctx_wptr);
829
830 if (ctx->ctx_data != NULL)
831 longjmp(ctx->ctx_wpcb, 1);
832 else if (wriob == NULL)
833 (void) runsvc();
834 else if ((ctx->ctx_data = mdb_context_create(runsvc)) != NULL)
835 mdb_context_switch(ctx->ctx_data);
836 else
837 mdb_warn("failed to create pipe context");
838 }
839 }
840
841 /*
842 * Write-side pipe service routine: if we longjmp here, just return to the
843 * write routine because now we have free space in the pipe buffer for writing;
844 * otherwise longjmp to the read-side to consume data and create space for us.
845 */
846 /*ARGSUSED*/
847 static void
wrsvc(mdb_iob_t * rdiob,mdb_iob_t * wriob,mdb_iob_ctx_t * ctx)848 wrsvc(mdb_iob_t *rdiob, mdb_iob_t *wriob, mdb_iob_ctx_t *ctx)
849 {
850 if (setjmp(ctx->ctx_wpcb) == 0) {
851 ctx->ctx_wptr = mdb.m_frame;
852 if (ctx->ctx_rptr != NULL)
853 mdb_frame_switch(ctx->ctx_rptr);
854
855 mdb.m_in = ctx->ctx_iob;
856 longjmp(ctx->ctx_rpcb, 1);
857 }
858 }
859
860 /*
861 * Call the current frame's mdb command. This entry point is used by the
862 * MDB parser to actually execute a command once it has successfully parsed
863 * a line of input. The command is waiting for us in the current frame.
864 * We loop through each command on the list, executing its dcmd with the
865 * appropriate argument. If the command has a successor, we know it had
866 * a | operator after it, and so we need to create a pipe and replace
867 * stdout with the pipe's output buffer.
868 */
869 int
mdb_call(uintmax_t addr,uintmax_t count,uint_t flags)870 mdb_call(uintmax_t addr, uintmax_t count, uint_t flags)
871 {
872 mdb_frame_t *fp = mdb.m_frame;
873 mdb_cmd_t *cp, *ncp;
874 mdb_iob_t *iobs[2];
875 int status, err = 0;
876 jmp_buf pcb;
877
878 if (mdb_iob_isapipe(mdb.m_in))
879 yyerror("syntax error");
880
881 mdb_intr_disable();
882 fp->f_cp = mdb_list_next(&fp->f_cmds);
883
884 if (flags & DCMD_LOOP)
885 flags |= DCMD_LOOPFIRST; /* set LOOPFIRST if this is a loop */
886
887 for (cp = mdb_list_next(&fp->f_cmds); cp; cp = mdb_list_next(cp)) {
888 if (mdb_list_next(cp) != NULL) {
889 mdb_iob_pipe(iobs, rdsvc, wrsvc);
890
891 mdb_iob_stack_push(&fp->f_istk, mdb.m_in, yylineno);
892 mdb.m_in = iobs[MDB_IOB_RDIOB];
893
894 mdb_iob_stack_push(&fp->f_ostk, mdb.m_out, 0);
895 mdb.m_out = iobs[MDB_IOB_WRIOB];
896
897 ncp = mdb_list_next(cp);
898 mdb_vcb_inherit(cp, ncp);
899
900 bcopy(fp->f_pcb, pcb, sizeof (jmp_buf));
901 ASSERT(fp->f_pcmd == NULL);
902 fp->f_pcmd = ncp;
903
904 mdb_frame_set_pipe(fp);
905
906 if ((err = setjmp(fp->f_pcb)) == 0) {
907 status = mdb_call_idcmd(cp->c_dcmd, addr, count,
908 flags | DCMD_PIPE_OUT, &cp->c_argv,
909 &cp->c_addrv, cp->c_vcbs);
910
911 mdb.m_lastret = status;
912
913 ASSERT(mdb.m_in == iobs[MDB_IOB_RDIOB]);
914 ASSERT(mdb.m_out == iobs[MDB_IOB_WRIOB]);
915 } else {
916 mdb_dprintf(MDB_DBG_DSTK, "frame <%u> caught "
917 "error %s from pipeline\n", fp->f_id,
918 mdb_err2str(err));
919 }
920
921 if (err != 0 || DCMD_ABORTED(status)) {
922 mdb_iob_setflags(mdb.m_in, MDB_IOB_ERR);
923 mdb_iob_setflags(mdb.m_out, MDB_IOB_ERR);
924 } else {
925 mdb_iob_flush(mdb.m_out);
926 (void) mdb_iob_ctl(mdb.m_out, I_FLUSH,
927 (void *)FLUSHW);
928 }
929
930 mdb_frame_clear_pipe(fp);
931
932 mdb_iob_destroy(mdb.m_out);
933 mdb.m_out = mdb_iob_stack_pop(&fp->f_ostk);
934
935 if (mdb.m_in != NULL)
936 mdb_iob_destroy(mdb.m_in);
937
938 mdb.m_in = mdb_iob_stack_pop(&fp->f_istk);
939 yylineno = mdb_iob_lineno(mdb.m_in);
940
941 fp->f_pcmd = NULL;
942 bcopy(pcb, fp->f_pcb, sizeof (jmp_buf));
943
944 if (MDB_ERR_IS_FATAL(err))
945 longjmp(fp->f_pcb, err);
946
947 if (err != 0 || DCMD_ABORTED(status) ||
948 mdb_addrvec_length(&ncp->c_addrv) == 0)
949 break;
950
951 addr = mdb_nv_get_value(mdb.m_dot);
952 count = 1;
953 flags = 0;
954
955 } else {
956 mdb_intr_enable();
957 mdb.m_lastret = mdb_call_idcmd(cp->c_dcmd, addr, count,
958 flags, &cp->c_argv, &cp->c_addrv, cp->c_vcbs);
959 mdb_intr_disable();
960 }
961
962 fp->f_cp = mdb_list_next(cp);
963 mdb_cmd_reset(cp);
964 }
965
966 /*
967 * If our last-command list is non-empty, destroy it. Then copy the
968 * current frame's cmd list to the m_lastc list and reset the frame.
969 */
970 while ((cp = mdb_list_next(&mdb.m_lastc)) != NULL) {
971 mdb_list_delete(&mdb.m_lastc, cp);
972 mdb_cmd_destroy(cp);
973 }
974
975 mdb_list_move(&fp->f_cmds, &mdb.m_lastc);
976 mdb_frame_reset(fp);
977 mdb_intr_enable();
978 return (err == 0);
979 }
980
981 uintmax_t
mdb_dot_incr(const char * op)982 mdb_dot_incr(const char *op)
983 {
984 uintmax_t odot, ndot;
985
986 odot = mdb_nv_get_value(mdb.m_dot);
987 ndot = odot + mdb.m_incr;
988
989 if ((odot ^ ndot) & 0x8000000000000000ull)
990 yyerror("'%s' would cause '.' to overflow\n", op);
991
992 return (ndot);
993 }
994
995 uintmax_t
mdb_dot_decr(const char * op)996 mdb_dot_decr(const char *op)
997 {
998 uintmax_t odot, ndot;
999
1000 odot = mdb_nv_get_value(mdb.m_dot);
1001 ndot = odot - mdb.m_incr;
1002
1003 if (ndot > odot)
1004 yyerror("'%s' would cause '.' to underflow\n", op);
1005
1006 return (ndot);
1007 }
1008
1009 mdb_iwalker_t *
mdb_walker_lookup(const char * s)1010 mdb_walker_lookup(const char *s)
1011 {
1012 const char *p = strchr(s, '`');
1013 mdb_var_t *v;
1014
1015 if (p != NULL) {
1016 size_t nbytes = MIN((size_t)(p - s), MDB_NV_NAMELEN - 1);
1017 char mname[MDB_NV_NAMELEN];
1018 mdb_module_t *mod;
1019
1020 (void) strncpy(mname, s, nbytes);
1021 mname[nbytes] = '\0';
1022
1023 if ((v = mdb_nv_lookup(&mdb.m_modules, mname)) == NULL) {
1024 (void) set_errno(EMDB_NOMOD);
1025 return (NULL);
1026 }
1027
1028 mod = mdb_nv_get_cookie(v);
1029
1030 if ((v = mdb_nv_lookup(&mod->mod_walkers, ++p)) != NULL)
1031 return (mdb_nv_get_cookie(v));
1032
1033 } else if ((v = mdb_nv_lookup(&mdb.m_walkers, s)) != NULL)
1034 return (mdb_nv_get_cookie(mdb_nv_get_cookie(v)));
1035
1036 (void) set_errno(EMDB_NOWALK);
1037 return (NULL);
1038 }
1039
1040 mdb_idcmd_t *
mdb_dcmd_lookup(const char * s)1041 mdb_dcmd_lookup(const char *s)
1042 {
1043 const char *p = strchr(s, '`');
1044 mdb_var_t *v;
1045
1046 if (p != NULL) {
1047 size_t nbytes = MIN((size_t)(p - s), MDB_NV_NAMELEN - 1);
1048 char mname[MDB_NV_NAMELEN];
1049 mdb_module_t *mod;
1050
1051 (void) strncpy(mname, s, nbytes);
1052 mname[nbytes] = '\0';
1053
1054 if ((v = mdb_nv_lookup(&mdb.m_modules, mname)) == NULL) {
1055 (void) set_errno(EMDB_NOMOD);
1056 return (NULL);
1057 }
1058
1059 mod = mdb_nv_get_cookie(v);
1060
1061 if ((v = mdb_nv_lookup(&mod->mod_dcmds, ++p)) != NULL)
1062 return (mdb_nv_get_cookie(v));
1063
1064 } else if ((v = mdb_nv_lookup(&mdb.m_dcmds, s)) != NULL)
1065 return (mdb_nv_get_cookie(mdb_nv_get_cookie(v)));
1066
1067 (void) set_errno(EMDB_NODCMD);
1068 return (NULL);
1069 }
1070
1071 void
mdb_dcmd_usage(const mdb_idcmd_t * idcp,mdb_iob_t * iob)1072 mdb_dcmd_usage(const mdb_idcmd_t *idcp, mdb_iob_t *iob)
1073 {
1074 const char *prefix = "", *usage = "";
1075 char name0 = idcp->idc_name[0];
1076
1077 if (idcp->idc_usage != NULL) {
1078 if (idcp->idc_usage[0] == ':') {
1079 if (name0 != ':' && name0 != '$')
1080 prefix = "address::";
1081 else
1082 prefix = "address";
1083 usage = &idcp->idc_usage[1];
1084
1085 } else if (idcp->idc_usage[0] == '?') {
1086 if (name0 != ':' && name0 != '$')
1087 prefix = "[address]::";
1088 else
1089 prefix = "[address]";
1090 usage = &idcp->idc_usage[1];
1091
1092 } else
1093 usage = idcp->idc_usage;
1094 }
1095
1096 mdb_iob_printf(iob, "Usage: %s%s %s\n", prefix, idcp->idc_name, usage);
1097
1098 if (idcp->idc_help != NULL) {
1099 mdb_iob_printf(iob, "%s: try '::help %s' for more "
1100 "information\n", mdb.m_pname, idcp->idc_name);
1101 }
1102 }
1103
1104 static mdb_idcmd_t *
dcmd_ndef(const mdb_idcmd_t * idcp)1105 dcmd_ndef(const mdb_idcmd_t *idcp)
1106 {
1107 mdb_var_t *v = mdb_nv_get_ndef(idcp->idc_var);
1108
1109 if (v != NULL)
1110 return (mdb_nv_get_cookie(mdb_nv_get_cookie(v)));
1111
1112 return (NULL);
1113 }
1114
1115 static int
dcmd_invoke(mdb_idcmd_t * idcp,uintptr_t addr,uint_t flags,int argc,const mdb_arg_t * argv,const mdb_vcb_t * vcbs)1116 dcmd_invoke(mdb_idcmd_t *idcp, uintptr_t addr, uint_t flags,
1117 int argc, const mdb_arg_t *argv, const mdb_vcb_t *vcbs)
1118 {
1119 int status;
1120
1121 mdb_dprintf(MDB_DBG_DCMD, "dcmd %s`%s dot = %lr incr = %llr\n",
1122 idcp->idc_modp->mod_name, idcp->idc_name, addr, mdb.m_incr);
1123
1124 if ((status = idcp->idc_funcp(addr, flags, argc, argv)) == DCMD_USAGE) {
1125 mdb_dcmd_usage(idcp, mdb.m_err);
1126 goto done;
1127 }
1128
1129 while (status == DCMD_NEXT && (idcp = dcmd_ndef(idcp)) != NULL)
1130 status = idcp->idc_funcp(addr, flags, argc, argv);
1131
1132 if (status == DCMD_USAGE)
1133 mdb_dcmd_usage(idcp, mdb.m_err);
1134
1135 if (status == DCMD_NEXT)
1136 status = DCMD_OK;
1137 done:
1138 /*
1139 * If standard output is a pipe and there are vcbs active, we need to
1140 * flush standard out and the write-side of the pipe. The reasons for
1141 * this are explained in more detail in mdb_vcb.c.
1142 */
1143 if ((flags & DCMD_PIPE_OUT) && (vcbs != NULL)) {
1144 mdb_iob_flush(mdb.m_out);
1145 (void) mdb_iob_ctl(mdb.m_out, I_FLUSH, (void *)FLUSHW);
1146 }
1147
1148 return (status);
1149 }
1150
1151 void
mdb_call_tab(mdb_idcmd_t * idcp,mdb_tab_cookie_t * mcp,uint_t flags,uintmax_t argc,mdb_arg_t * argv)1152 mdb_call_tab(mdb_idcmd_t *idcp, mdb_tab_cookie_t *mcp, uint_t flags,
1153 uintmax_t argc, mdb_arg_t *argv)
1154 {
1155 if (idcp->idc_tabp == NULL)
1156 return;
1157
1158 idcp->idc_tabp(mcp, flags, argc, argv);
1159 }
1160
1161 /*
1162 * Call an internal dcmd directly: this code is used by module API functions
1163 * that need to execute dcmds, and by mdb_call() above.
1164 */
1165 int
mdb_call_idcmd(mdb_idcmd_t * idcp,uintmax_t addr,uintmax_t count,uint_t flags,mdb_argvec_t * avp,mdb_addrvec_t * adp,mdb_vcb_t * vcbs)1166 mdb_call_idcmd(mdb_idcmd_t *idcp, uintmax_t addr, uintmax_t count,
1167 uint_t flags, mdb_argvec_t *avp, mdb_addrvec_t *adp, mdb_vcb_t *vcbs)
1168 {
1169 int is_exec = (strcmp(idcp->idc_name, "$<") == 0);
1170 mdb_arg_t *argv;
1171 int argc;
1172 uintmax_t i;
1173 int status;
1174
1175 /*
1176 * Update the values of dot and the most recent address and count
1177 * to the values of our input parameters.
1178 */
1179 mdb_nv_set_value(mdb.m_dot, addr);
1180 mdb.m_raddr = addr;
1181 mdb.m_dcount = count;
1182
1183 /*
1184 * Here the adb(1) man page lies: '9' is only set to count
1185 * when the command is $<, not when it's $<<.
1186 */
1187 if (is_exec)
1188 mdb_nv_set_value(mdb.m_rcount, count);
1189
1190 /*
1191 * We can now return if the repeat count is zero.
1192 */
1193 if (count == 0)
1194 return (DCMD_OK);
1195
1196 /*
1197 * To guard against bad dcmds, we avoid passing the actual argv that
1198 * we will use to free argument strings directly to the dcmd. Instead,
1199 * we pass a copy that will be garbage collected automatically.
1200 */
1201 argc = avp->a_nelems;
1202 argv = mdb_alloc(sizeof (mdb_arg_t) * argc, UM_SLEEP | UM_GC);
1203 bcopy(avp->a_data, argv, sizeof (mdb_arg_t) * argc);
1204
1205 if (mdb_addrvec_length(adp) != 0) {
1206 flags |= DCMD_PIPE | DCMD_LOOP | DCMD_LOOPFIRST | DCMD_ADDRSPEC;
1207 addr = mdb_addrvec_shift(adp);
1208 mdb_nv_set_value(mdb.m_dot, addr);
1209 mdb_vcb_propagate(vcbs);
1210 count = 1;
1211 }
1212
1213 status = dcmd_invoke(idcp, addr, flags, argc, argv, vcbs);
1214 if (DCMD_ABORTED(status))
1215 goto done;
1216
1217 /*
1218 * If the command is $< and we're not receiving input from a pipe, we
1219 * ignore the repeat count and just return since the macro file is now
1220 * pushed on to the input stack.
1221 */
1222 if (is_exec && mdb_addrvec_length(adp) == 0)
1223 goto done;
1224
1225 /*
1226 * If we're going to loop, we've already executed the dcmd once,
1227 * so clear the LOOPFIRST flag before proceeding.
1228 */
1229 if (flags & DCMD_LOOP)
1230 flags &= ~DCMD_LOOPFIRST;
1231
1232 for (i = 1; i < count; i++) {
1233 addr = mdb_dot_incr(",");
1234 mdb_nv_set_value(mdb.m_dot, addr);
1235 status = dcmd_invoke(idcp, addr, flags, argc, argv, vcbs);
1236 if (DCMD_ABORTED(status))
1237 goto done;
1238 }
1239
1240 while (mdb_addrvec_length(adp) != 0) {
1241 addr = mdb_addrvec_shift(adp);
1242 mdb_nv_set_value(mdb.m_dot, addr);
1243 mdb_vcb_propagate(vcbs);
1244 status = dcmd_invoke(idcp, addr, flags, argc, argv, vcbs);
1245 if (DCMD_ABORTED(status))
1246 goto done;
1247 }
1248 done:
1249 mdb_iob_nlflush(mdb.m_out);
1250 return (status);
1251 }
1252
1253 void
mdb_intr_enable(void)1254 mdb_intr_enable(void)
1255 {
1256 ASSERT(mdb.m_intr >= 1);
1257 if (mdb.m_intr == 1 && mdb.m_pend != 0) {
1258 (void) mdb_signal_block(SIGINT);
1259 mdb.m_intr = mdb.m_pend = 0;
1260 mdb_dprintf(MDB_DBG_DSTK, "delivering pending INT\n");
1261 longjmp(mdb.m_frame->f_pcb, MDB_ERR_SIGINT);
1262 } else
1263 mdb.m_intr--;
1264 }
1265
1266 void
mdb_intr_disable(void)1267 mdb_intr_disable(void)
1268 {
1269 mdb.m_intr++;
1270 ASSERT(mdb.m_intr >= 1);
1271 }
1272
1273 /*
1274 * Create an encoded string representing the internal user-modifiable
1275 * configuration of the debugger and return a pointer to it. The string can be
1276 * used to initialize another instance of the debugger with the same
1277 * configuration as this one.
1278 */
1279 char *
mdb_get_config(void)1280 mdb_get_config(void)
1281 {
1282 size_t r, n = 0;
1283 char *s = NULL;
1284
1285 while ((r = mdb_snprintf(s, n,
1286 "%x;%x;%x;%x;%x;%x;%lx;%x;%x;%s;%s;%s;%s;%s",
1287 mdb.m_tgtflags, mdb.m_flags, mdb.m_debug, mdb.m_radix, mdb.m_nargs,
1288 mdb.m_histlen, (ulong_t)mdb.m_symdist, mdb.m_execmode,
1289 mdb.m_forkmode, mdb.m_root, mdb.m_termtype, mdb.m_ipathstr,
1290 mdb.m_lpathstr, mdb.m_prompt)) > n) {
1291
1292 mdb_free(s, n);
1293 n = r + 1;
1294 s = mdb_alloc(r + 1, UM_SLEEP);
1295 }
1296
1297 return (s);
1298 }
1299
1300 /*
1301 * Decode a configuration string created with mdb_get_config() and reset the
1302 * appropriate parts of the global mdb_t accordingly.
1303 */
1304 void
mdb_set_config(const char * s)1305 mdb_set_config(const char *s)
1306 {
1307 const char *p;
1308 size_t len;
1309
1310 if ((p = strchr(s, ';')) != NULL) {
1311 mdb.m_tgtflags = strntoul(s, (size_t)(p - s), 16);
1312 s = p + 1;
1313 }
1314
1315 if ((p = strchr(s, ';')) != NULL) {
1316 mdb.m_flags = strntoul(s, (size_t)(p - s), 16);
1317 mdb.m_flags &= ~(MDB_FL_LOG | MDB_FL_LATEST);
1318 s = p + 1;
1319 }
1320
1321 if ((p = strchr(s, ';')) != NULL) {
1322 mdb.m_debug = strntoul(s, (size_t)(p - s), 16);
1323 s = p + 1;
1324 }
1325
1326 if ((p = strchr(s, ';')) != NULL) {
1327 mdb.m_radix = (int)strntoul(s, (size_t)(p - s), 16);
1328 if (mdb.m_radix < 2 || mdb.m_radix > 16)
1329 mdb.m_radix = MDB_DEF_RADIX;
1330 s = p + 1;
1331 }
1332
1333 if ((p = strchr(s, ';')) != NULL) {
1334 mdb.m_nargs = (int)strntoul(s, (size_t)(p - s), 16);
1335 mdb.m_nargs = MAX(mdb.m_nargs, 0);
1336 s = p + 1;
1337 }
1338
1339 if ((p = strchr(s, ';')) != NULL) {
1340 mdb.m_histlen = (int)strntoul(s, (size_t)(p - s), 16);
1341 mdb.m_histlen = MAX(mdb.m_histlen, 1);
1342 s = p + 1;
1343 }
1344
1345 if ((p = strchr(s, ';')) != NULL) {
1346 mdb.m_symdist = strntoul(s, (size_t)(p - s), 16);
1347 s = p + 1;
1348 }
1349
1350 if ((p = strchr(s, ';')) != NULL) {
1351 mdb.m_execmode = (uchar_t)strntoul(s, (size_t)(p - s), 16);
1352 if (mdb.m_execmode > MDB_EM_FOLLOW)
1353 mdb.m_execmode = MDB_EM_ASK;
1354 s = p + 1;
1355 }
1356
1357 if ((p = strchr(s, ';')) != NULL) {
1358 mdb.m_forkmode = (uchar_t)strntoul(s, (size_t)(p - s), 16);
1359 if (mdb.m_forkmode > MDB_FM_CHILD)
1360 mdb.m_forkmode = MDB_FM_ASK;
1361 s = p + 1;
1362 }
1363
1364 if ((p = strchr(s, ';')) != NULL) {
1365 mdb.m_root = strndup(s, (size_t)(p - s));
1366 s = p + 1;
1367 }
1368
1369 if ((p = strchr(s, ';')) != NULL) {
1370 mdb.m_termtype = strndup(s, (size_t)(p - s));
1371 s = p + 1;
1372 }
1373
1374 if ((p = strchr(s, ';')) != NULL) {
1375 size_t len = MIN(sizeof (mdb.m_ipathstr) - 1, p - s);
1376 (void) strncpy(mdb.m_ipathstr, s, len);
1377 mdb.m_ipathstr[len] = '\0';
1378 s = p + 1;
1379 }
1380
1381 if ((p = strchr(s, ';')) != NULL) {
1382 size_t len = MIN(sizeof (mdb.m_lpathstr) - 1, p - s);
1383 (void) strncpy(mdb.m_lpathstr, s, len);
1384 mdb.m_lpathstr[len] = '\0';
1385 s = p + 1;
1386 }
1387
1388 p = s + strlen(s);
1389 len = MIN(MDB_PROMPTLEN, (size_t)(p - s));
1390 (void) strncpy(mdb.m_prompt, s, len);
1391 mdb.m_prompt[len] = '\0';
1392 mdb.m_promptlen = len;
1393 }
1394
1395 mdb_module_t *
mdb_get_module(void)1396 mdb_get_module(void)
1397 {
1398 if (mdb.m_lmod)
1399 return (mdb.m_lmod);
1400
1401 if (mdb.m_frame == NULL)
1402 return (NULL);
1403
1404 if (mdb.m_frame->f_wcbs && mdb.m_frame->f_wcbs->w_walker &&
1405 mdb.m_frame->f_wcbs->w_walker->iwlk_modp &&
1406 !mdb.m_frame->f_cbactive)
1407 return (mdb.m_frame->f_wcbs->w_walker->iwlk_modp);
1408
1409 if (mdb.m_frame->f_cp && mdb.m_frame->f_cp->c_dcmd)
1410 return (mdb.m_frame->f_cp->c_dcmd->idc_modp);
1411
1412 return (NULL);
1413 }
1414