forked from crash-utility/crash
-
Notifications
You must be signed in to change notification settings - Fork 0
/
gdb_interface.c
1084 lines (941 loc) · 28.4 KB
/
gdb_interface.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/* gdb_interface.c - core analysis suite
*
* Copyright (C) 1999, 2000, 2001, 2002 Mission Critical Linux, Inc.
* Copyright (C) 2002-2015,2018-2019 David Anderson
* Copyright (C) 2002-2015,2018-2019 Red Hat, Inc. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include "defs.h"
#ifndef GDB_10_2
static void exit_after_gdb_info(void);
#endif
static int is_restricted_command(char *, ulong);
static void strip_redirection(char *);
int get_frame_offset(ulong);
int *gdb_output_format;
unsigned int *gdb_print_max;
unsigned char *gdb_prettyprint_structs;
unsigned char *gdb_prettyprint_arrays;
unsigned int *gdb_repeat_count_threshold;
unsigned char *gdb_stop_print_at_null;
unsigned int *gdb_output_radix;
static void gdb_error_debug(void);
static ulong gdb_user_print_option_address(char *);
/*
* Called from main() this routine sets up the call-back hook such that
* gdb's main() routine -- renamed gdb_main() -- will call back to
* our main_loop() after gdb initializes.
*/
void
gdb_main_loop(int argc, char **argv)
{
argc = 1;
if (pc->flags & SILENT) {
if (pc->flags & READNOW)
argv[argc++] = "--readnow";
argv[argc++] = "--quiet";
argv[argc++] = pc->namelist_debug ?
pc->namelist_debug :
(pc->debuginfo_file && (st->flags & CRC_MATCHES) ?
pc->debuginfo_file : pc->namelist);
} else {
if (pc->flags & READNOW)
argv[argc++] = "--readnow";
argv[argc++] = pc->namelist_debug ?
pc->namelist_debug :
(pc->debuginfo_file && (st->flags & CRC_MATCHES) ?
pc->debuginfo_file : pc->namelist);
}
if (CRASHDEBUG(1)) {
int i;
fprintf(fp, "gdb ");
for (i = 1; i < argc; i++)
fprintf(fp, "%s ", argv[i]);
fprintf(fp, "\n");
}
optind = 0;
#ifndef GDB_10_2
#if defined(GDB_5_3) || defined(GDB_6_0) || defined(GDB_6_1)
command_loop_hook = main_loop;
#else
deprecated_command_loop_hook = main_loop;
#endif
#endif
gdb_main_entry(argc, argv);
}
/*
* Update any hooks that gdb has set.
*/
void
update_gdb_hooks(void)
{
#if defined(GDB_6_0) || defined(GDB_6_1)
command_loop_hook = pc->flags & VERSION_QUERY ?
exit_after_gdb_info : main_loop;
target_new_objfile_hook = NULL;
#endif
#if defined(GDB_7_0) || defined(GDB_7_3_1) || defined(GDB_7_6)
deprecated_command_loop_hook = pc->flags & VERSION_QUERY ?
exit_after_gdb_info : main_loop;
#endif
}
void
gdb_readnow_warning(void)
{
if ((THIS_GCC_VERSION >= GCC(3,4,0)) && (THIS_GCC_VERSION < GCC(4,0,0))
&& !(pc->flags & READNOW)) {
fprintf(stderr,
"WARNING: Because this kernel was compiled with gcc version %d.%d.%d, certain\n"
" commands or command options may fail unless crash is invoked with\n"
" the \"--readnow\" command line option.\n\n",
kt->gcc_version[0],
kt->gcc_version[1],
kt->gcc_version[2]);
}
}
/*
* Used only by the -v command line option, get gdb to initialize itself
* with no arguments, print its version and GPL paragraph, and then call
* back to exit_after_gdb_info().
*/
void
display_gdb_banner(void)
{
optind = 0;
#ifndef GDB_10_2
#if defined(GDB_5_3) || defined(GDB_6_0) || defined(GDB_6_1)
command_loop_hook = exit_after_gdb_info;
#else
deprecated_command_loop_hook = exit_after_gdb_info;
#endif
#endif
args[0] = "gdb";
args[1] = "-version";
gdb_main_entry(2, args);
}
#ifndef GDB_10_2
static void
exit_after_gdb_info(void)
{
fprintf(fp, "\n");
clean_exit(0);
}
#endif
/*
* Stash a copy of the gdb version locally. This can be called before
* gdb gets initialized, so bypass gdb_interface().
*/
void
get_gdb_version(void)
{
struct gnu_request request;
if (!pc->gdb_version) {
request.command = GNU_VERSION;
gdb_command_funnel(&request); /* bypass gdb_interface() */
pc->gdb_version = request.buf;
}
}
void
gdb_session_init(void)
{
struct gnu_request *req;
int debug_data_pulled_in;
if (!have_partial_symbols() && !have_full_symbols())
no_debugging_data(FATAL);
/*
* Restore the SIGINT and SIGPIPE handlers, which got temporarily
* re-assigned by gdb. The SIGINT call also initializes GDB's
* SIGINT sigaction.
*/
SIGACTION(SIGINT, restart, &pc->sigaction, &pc->gdb_sigaction);
SIGACTION(SIGPIPE, SIG_IGN, &pc->sigaction, NULL);
if (!(pc->flags & DROP_CORE))
SIGACTION(SIGSEGV, restart, &pc->sigaction, NULL);
/*
* Set up pointers to gdb variables.
*/
#if defined(GDB_5_3) || defined(GDB_6_0) || defined(GDB_6_1)
gdb_output_format = &output_format;
gdb_print_max = &print_max;
gdb_prettyprint_structs = &prettyprint_structs;
gdb_prettyprint_arrays = &prettyprint_arrays;
gdb_repeat_count_threshold = &repeat_count_threshold;
gdb_stop_print_at_null = &stop_print_at_null;
gdb_output_radix = &output_radix;
#else
gdb_output_format = (int *)
gdb_user_print_option_address("output_format");
gdb_print_max = (unsigned int *)
gdb_user_print_option_address("print_max");
gdb_prettyprint_structs = (unsigned char *)
gdb_user_print_option_address("prettyprint_structs");
gdb_prettyprint_arrays = (unsigned char *)
gdb_user_print_option_address("prettyprint_arrays");
gdb_repeat_count_threshold = (unsigned int *)
gdb_user_print_option_address("repeat_count_threshold");
gdb_stop_print_at_null = (unsigned char *)
gdb_user_print_option_address("stop_print_at_null");
gdb_output_radix = (unsigned int *)
gdb_user_print_option_address("output_radix");
#endif
/*
* If the output radix is set via the --hex or --dec command line
* option, then pc->output_radix will be non-zero; otherwise use
* the gdb default.
*/
if (pc->output_radix) {
*gdb_output_radix = pc->output_radix;
*gdb_output_format = (*gdb_output_radix == 10) ? 0 : 'x';
}
switch (*gdb_output_radix)
{
case 10:
case 16:
pc->output_radix = *gdb_output_radix;
break;
default:
pc->output_radix = *gdb_output_radix = 10;
*gdb_output_format = 0;
}
*gdb_prettyprint_structs = 1;
*gdb_repeat_count_threshold = 0x7fffffff;
*gdb_print_max = 256;
#ifdef GDB_5_3
gdb_disassemble_from_exec = 0;
#endif
pc->flags |= GDB_INIT; /* set here so gdb_interface will work */
req = (struct gnu_request *)GETBUF(sizeof(struct gnu_request));
req->buf = GETBUF(BUFSIZE);
/*
* Make sure the namelist has symbolic data. Later versions of
* gcc may require that debug data be pulled in by printing a
* static kernel data structure.
*/
debug_data_pulled_in = FALSE;
retry:
BZERO(req->buf, BUFSIZE);
req->command = GNU_GET_DATATYPE;
req->name = XEN_HYPER_MODE() ? "page_info" : "task_struct";
req->flags = GNU_RETURN_ON_ERROR;
gdb_interface(req);
if (req->flags & GNU_COMMAND_FAILED) {
if (XEN_HYPER_MODE())
no_debugging_data(WARNING); /* just bail out */
if (!debug_data_pulled_in) {
if (CRASHDEBUG(1))
error(INFO,
"gdb_session_init: pulling in debug data by accessing init_mm.mmap %s\n",
symbol_exists("sysfs_mount") ?
"and syfs_mount" : "");
debug_data_pulled_in = TRUE;
req->command = GNU_PASS_THROUGH;
req->flags = GNU_RETURN_ON_ERROR|GNU_NO_READMEM;
req->name = NULL;
if (symbol_exists("sysfs_mount"))
sprintf(req->buf, "print sysfs_mount, init_mm.mmap");
else
sprintf(req->buf, "print init_mm.mmap");
gdb_interface(req);
if (!(req->flags & GNU_COMMAND_FAILED))
goto retry;
}
no_debugging_data(WARNING);
}
if (pc->flags & KERNEL_DEBUG_QUERY) {
fprintf(fp, "\n%s: %s: contains debugging data\n\n",
pc->program_name, pc->namelist);
if (REMOTE())
remote_exit();
clean_exit(0);
}
/*
* Set up any pre-ordained gdb settings here that can't be
* accessed directly.
*/
req->command = GNU_PASS_THROUGH;
req->name = NULL, req->flags = 0;
sprintf(req->buf, "set height 0");
gdb_interface(req);
req->command = GNU_PASS_THROUGH;
req->name = NULL, req->flags = 0;
sprintf(req->buf, "set width 0");
gdb_interface(req);
#ifdef GDB_10_2
req->command = GNU_PASS_THROUGH;
req->name = NULL, req->flags = 0;
sprintf(req->buf, "set max-value-size unlimited");
gdb_interface(req);
req->command = GNU_PASS_THROUGH;
req->name = NULL, req->flags = 0;
sprintf(req->buf, "set max-completions unlimited");
gdb_interface(req);
#endif
#if 0
/*
* Patch gdb's symbol values with the correct values from either
* the System.map or non-debug vmlinux, whichever is in effect.
*/
if ((pc->flags & SYSMAP) || (kt->flags & (RELOC_SET|RELOC_FORCE)) ||
(pc->namelist_debug && !pc->debuginfo_file)) {
req->command = GNU_PATCH_SYMBOL_VALUES;
req->flags = GNU_RETURN_ON_ERROR;
gdb_interface(req);
if (req->flags & GNU_COMMAND_FAILED)
error(FATAL, "patching of gdb symbol values failed\n");
} else if (!(pc->flags & SILENT))
#else
if (!(pc->flags & SILENT))
#endif
fprintf(fp, "\n");
FREEBUF(req->buf);
FREEBUF(req);
}
/*
* Quickest way to gdb -- just pass a command string to pass through.
*/
int
gdb_pass_through(char *cmd, FILE *fptr, ulong flags)
{
struct gnu_request *req;
int retval;
if (CRASHDEBUG(1))
console("gdb_pass_through: [%s]\n", cmd);
req = (struct gnu_request *)GETBUF(sizeof(struct gnu_request));
req->buf = cmd;
if (fptr)
req->fp = fptr;
req->command = GNU_PASS_THROUGH;
req->flags = flags;
gdb_interface(req);
if ((req->flags & (GNU_RETURN_ON_ERROR|GNU_COMMAND_FAILED)) ==
(GNU_RETURN_ON_ERROR|GNU_COMMAND_FAILED))
retval = FALSE;
else
retval = TRUE;
FREEBUF(req);
return retval;
}
/*
* General purpose routine for passing commands to gdb. All gdb commands
* come through here, where they are passed to gdb_command_funnel().
*/
void
gdb_interface(struct gnu_request *req)
{
if (!(pc->flags & GDB_INIT))
error(FATAL, "gdb_interface: gdb not initialized?\n");
if (output_closed())
restart(0);
if (!req->fp) {
req->fp = ((pc->flags & RUNTIME) || (pc->flags2 & ALLOW_FP)) ?
fp : CRASHDEBUG(1) ? fp : pc->nullfp;
}
pc->cur_req = req;
pc->cur_gdb_cmd = req->command;
if (CRASHDEBUG(2))
dump_gnu_request(req, IN_GDB);
if (!(pc->flags & DROP_CORE))
SIGACTION(SIGSEGV, restart, &pc->sigaction, NULL);
else
SIGACTION(SIGSEGV, SIG_DFL, &pc->sigaction, NULL);
if (interruptible()) {
SIGACTION(SIGINT, pc->gdb_sigaction.sa_handler,
&pc->gdb_sigaction, NULL);
} else {
SIGACTION(SIGINT, SIG_IGN, &pc->sigaction, NULL);
SIGACTION(SIGPIPE, SIG_IGN, &pc->sigaction, NULL);
}
pc->flags |= IN_GDB;
gdb_command_funnel(req);
pc->flags &= ~IN_GDB;
SIGACTION(SIGINT, restart, &pc->sigaction, NULL);
SIGACTION(SIGSEGV, SIG_DFL, &pc->sigaction, NULL);
if (req->flags & GNU_COMMAND_FAILED)
gdb_error_debug();
if (CRASHDEBUG(2))
dump_gnu_request(req, !IN_GDB);
pc->last_gdb_cmd = pc->cur_gdb_cmd;
pc->cur_gdb_cmd = 0;
pc->cur_req = NULL;
}
/*
* help -g output
*/
void
dump_gdb_data(void)
{
fprintf(fp, " prettyprint_arrays: %d\n", *gdb_prettyprint_arrays);
fprintf(fp, " prettyprint_structs: %d\n", *gdb_prettyprint_structs);
fprintf(fp, "repeat_count_threshold: %x\n", *gdb_repeat_count_threshold);
fprintf(fp, " stop_print_at_null: %d\n", *gdb_stop_print_at_null);
fprintf(fp, " print_max: %d\n", *gdb_print_max);
fprintf(fp, " output_radix: %d\n", *gdb_output_radix);
fprintf(fp, " output_format: ");
switch (*gdb_output_format)
{
case 'x':
fprintf(fp, "hex\n"); break;
case 'o':
fprintf(fp, "octal\n"); break;
case 0:
fprintf(fp, "decimal\n"); break;
}
}
void
dump_gnu_request(struct gnu_request *req, int in_gdb)
{
int others;
char buf[BUFSIZE];
if (pc->flags & KERNEL_DEBUG_QUERY)
return;
console("%scommand: %d (%s)\n", in_gdb ? "GDB IN: " : "GDB OUT: ",
req->command, gdb_command_string(req->command, buf, TRUE));
console("buf: %lx ", req->buf);
if (req->buf && ascii_string(req->buf))
console(" \"%s\"", req->buf);
console("\n");
console("fp: %lx ", req->fp);
if (req->fp == pc->nullfp)
console("(pc->nullfp) ");
if (req->fp == pc->stdpipe)
console("(pc->stdpipe) ");
if (req->fp == pc->pipe)
console("(pc->pipe) ");
if (req->fp == pc->ofile)
console("(pc->ofile) ");
if (req->fp == pc->ifile)
console("(pc->ifile) ");
if (req->fp == pc->ifile_pipe)
console("(pc->ifile_pipe) ");
if (req->fp == pc->ifile_ofile)
console("(pc->ifile_ofile) ");
if (req->fp == pc->tmpfile)
console("(pc->tmpfile) ");
if (req->fp == pc->saved_fp)
console("(pc->saved_fp) ");
if (req->fp == pc->tmp_fp)
console("(pc->tmp_fp) ");
console("flags: %lx (", req->flags);
others = 0;
if (req->flags & GNU_PRINT_LINE_NUMBERS)
console("%sGNU_PRINT_LINE_NUMBERS", others++ ? "|" : "");
if (req->flags & GNU_FUNCTION_ONLY)
console("%sGNU_FUNCTION_ONLY", others++ ? "|" : "");
if (req->flags & GNU_PRINT_ENUMERATORS)
console("%sGNU_PRINT_ENUMERATORS", others++ ? "|" : "");
if (req->flags & GNU_RETURN_ON_ERROR)
console("%sGNU_RETURN_ON_ERROR", others++ ? "|" : "");
if (req->flags & GNU_FROM_TTY_OFF)
console("%sGNU_FROM_TTY_OFF", others++ ? "|" : "");
if (req->flags & GNU_NO_READMEM)
console("%sGNU_NO_READMEM", others++ ? "|" : "");
if (req->flags & GNU_VAR_LENGTH_TYPECODE)
console("%sGNU_VAR_LENGTH_TYPECODE", others++ ? "|" : "");
console(")\n");
console("addr: %lx ", req->addr);
console("addr2: %lx ", req->addr2);
console("count: %ld\n", req->count);
if ((ulong)req->name > (ulong)PATCH_KERNEL_SYMBOLS_STOP)
console("name: \"%s\" ", req->name);
else
console("name: %lx ", (ulong)req->name);
console("length: %ld ", req->length);
console("typecode: %d\n", req->typecode);
#if defined(GDB_5_3) || defined(GDB_6_0) || defined(GDB_6_1) || defined(GDB_7_0)
console("typename: %s\n", req->typename);
#else
console("type_name: %s\n", req->type_name);
#endif
console("target_typename: %s\n", req->target_typename);
console("target_length: %ld ", req->target_length);
console("target_typecode: %d ", req->target_typecode);
console("is_typedef: %d ", req->is_typedef);
console("member: \"%s\" ", req->member);
console("member_offset: %ld\n", req->member_offset);
console("member_length: %ld\n", req->member_length);
console("member_typecode: %d\n", req->member_typecode);
console("member_main_type_name: %s\n", req->member_main_type_name);
console("member_main_type_tag_name: %s\n", req->member_main_type_tag_name);
console("member_target_type_name: %s\n", req->member_target_type_name);
console("member_target_type_tag_name: %s\n", req->member_target_type_tag_name);
console("value: %lx ", req->value);
console("tagname: \"%s\" ", req->tagname);
console("pc: %lx ", req->pc);
if (is_kernel_text(req->pc))
console("(%s)", value_to_symstr(req->pc, buf, 0));
console("\n");
console("sp: %lx ", req->sp);
console("ra: %lx ", req->ra);
console("frame: %ld ", req->frame);
console("prevsp: %lx\n", req->prevsp);
console("prevpc: %lx ", req->prevpc);
console("lastsp: %lx ", req->lastsp);
console("task: %lx ", req->task);
console("debug: %lx\n", req->debug);
console("\n");
}
char *
gdb_command_string(int cmd, char *buf, int live)
{
switch (cmd)
{
case GNU_PASS_THROUGH:
sprintf(buf, "GNU_PASS_THROUGH");
break;
case GNU_DATATYPE_INIT:
sprintf(buf, "GNU_DATATYPE_INIT");
break;
case GNU_DISASSEMBLE:
sprintf(buf, "GNU_DISASSEMBLE");
break;
case GNU_GET_LINE_NUMBER:
sprintf(buf, "GNU_GET_LINE_NUMBER");
break;
case GNU_GET_DATATYPE:
if (live)
sprintf(buf, "GNU_GET_DATATYPE[%s]",
pc->cur_req->name ? pc->cur_req->name : "?");
else
sprintf(buf, "GNU_GET_DATATYPE");
break;
case GNU_STACK_TRACE:
sprintf(buf, "GNU_STACK_TRACE");
break;
case GNU_ALPHA_FRAME_OFFSET:
sprintf(buf, "GNU_ALPHA_FRAME_OFFSET");
break;
case GNU_COMMAND_EXISTS:
sprintf(buf, "GNU_COMMAND_EXISTS");
break;
case GNU_FUNCTION_NUMARGS:
sprintf(buf, "GNU_FUNCTION_NUMARGS");
break;
case GNU_RESOLVE_TEXT_ADDR:
sprintf(buf, "GNU_RESOLVE_TEXT_ADDR");
break;
case GNU_DEBUG_COMMAND:
sprintf(buf, "GNU_DEBUG_COMMAND");
break;
case GNU_ADD_SYMBOL_FILE:
sprintf(buf, "GNU_ADD_SYMBOL_FILE");
break;
case GNU_DELETE_SYMBOL_FILE:
sprintf(buf, "GNU_DELETE_SYMBOL_FILE");
break;
case GNU_VERSION:
sprintf(buf, "GNU_VERSION");
break;
case GNU_GET_SYMBOL_TYPE:
sprintf(buf, "GNU_GET_SYMBOL_TYPE");
break;
case GNU_PATCH_SYMBOL_VALUES:
sprintf(buf, "GNU_PATCH_SYMBOL_VALUES");
break;
case GNU_USER_PRINT_OPTION:
sprintf(buf, "GNU_USER_PRINT_OPTION");
break;
case GNU_SET_CRASH_BLOCK:
sprintf(buf, "GNU_SET_CRASH_BLOCK");
break;
case GNU_GET_FUNCTION_RANGE:
sprintf(buf, "GNU_GET_FUNCTION_RANGE");
break;
case 0:
buf[0] = NULLCHAR;
break;
default:
sprintf(buf, "(?)\n");
break;
}
return buf;
}
/*
* Restore known gdb state.
*/
void
restore_gdb_sanity(void)
{
if (!(pc->flags & GDB_INIT))
return;
if (pc->output_radix) {
*gdb_output_radix = pc->output_radix;
*gdb_output_format = (*gdb_output_radix == 10) ? 0 : 'x';
}
*gdb_prettyprint_structs = 1; /* these may piss somebody off... */
*gdb_repeat_count_threshold = 0x7fffffff;
if (st->flags & ADD_SYMBOL_FILE) {
error(INFO,
"%s\n gdb add-symbol-file command failed\n",
st->current->mod_namelist);
delete_load_module(st->current->mod_base);
st->flags &= ~ADD_SYMBOL_FILE;
}
if (pc->cur_gdb_cmd) {
pc->last_gdb_cmd = pc->cur_gdb_cmd;
pc->cur_gdb_cmd = 0;
}
}
/*
* Check whether string in args[0] is a valid gdb command.
*/
int
is_gdb_command(int merge_orig_args, ulong flags)
{
int retval;
struct gnu_request *req;
if (!args[0])
return FALSE;
if (STREQ(args[0], "Q")) {
args[0] = "q";
return TRUE;
}
if (is_restricted_command(args[0], flags))
return FALSE;
req = (struct gnu_request *)GETBUF(sizeof(struct gnu_request));
req->buf = GETBUF(strlen(args[0])+1);
req->command = GNU_COMMAND_EXISTS;
req->name = args[0];
req->flags = GNU_RETURN_ON_ERROR;
req->fp = pc->nullfp;
gdb_interface(req);
if (req->flags & GNU_COMMAND_FAILED)
retval = FALSE;
else
retval = req->value;
FREEBUF(req->buf);
FREEBUF(req);
if (retval && merge_orig_args) {
int i;
for (i = argcnt; i; i--)
args[i] = args[i-1];
args[0] = "gdb";
argcnt++;
}
return retval;
}
/*
* Check whether a command is on the gdb-prohibited list.
*/
static char *prohibited_list[] = {
"run", "r", "break", "b", "tbreak", "hbreak", "thbreak", "rbreak",
"watch", "rwatch", "awatch", "attach", "continue", "c", "fg", "detach",
"finish", "handle", "interrupt", "jump", "kill", "next", "nexti",
"signal", "step", "s", "stepi", "target", "until", "delete",
"clear", "disable", "enable", "condition", "ignore", "frame", "catch",
"tcatch", "return", "file", "exec-file", "core-file", "symbol-file",
"load", "si", "ni", "shell", "sy",
NULL /* must be last */
};
static char *restricted_list[] = {
"define", "document", "while", "if",
NULL /* must be last */
};
#define RESTRICTED_GDB_COMMAND \
"restricted gdb command: %s\n%s\"%s\" may only be used in a .gdbinit file or in a command file.\n%sThe .gdbinit file is read automatically during %s initialization.\n%sOther user-defined command files may be read interactively during\n%s%s runtime by using the gdb \"source\" command.\n"
static int
is_restricted_command(char *cmd, ulong flags)
{
int i;
char *newline;
for (i = 0; prohibited_list[i]; i++) {
if (STREQ(prohibited_list[i], cmd)) {
if (flags == RETURN_ON_ERROR)
return TRUE;
pc->curcmd = pc->program_name;
error(FATAL, "prohibited gdb command: %s\n", cmd);
}
}
for (i = 0; restricted_list[i]; i++) {
if (STREQ(restricted_list[i], cmd)) {
if (flags == RETURN_ON_ERROR)
return TRUE;
newline = space(strlen(pc->program_name)+2);
pc->curcmd = pc->program_name;
error(FATAL, RESTRICTED_GDB_COMMAND,
cmd, newline, cmd,
newline, pc->program_name,
newline, newline, pc->program_name);
}
}
return FALSE;
}
/*
* Remove pipe/redirection stuff from the end of the command line.
*/
static void
strip_redirection(char *buf)
{
char *p1, *p2;
p1 = strstr_rightmost(buf, args[argcnt-1]);
p2 = p1 + strlen(args[argcnt-1]);
console("strip_redirection: [%s]\n", p2);
if ((p1 = strpbrk(p2, "|!>")))
*p1 = NULLCHAR;
strip_ending_whitespace(buf);
}
/*
* Command for passing strings directly to gdb.
*/
void
cmd_gdb(void)
{
char buf[BUFSIZE];
char **argv;
argv = STREQ(args[0], "gdb") ? &args[1] : &args[0];
if (*argv == NULL)
cmd_usage(pc->curcmd, SYNOPSIS);
if (STREQ(*argv, "set") && argv[1]) {
/*
* Intercept set commands in case something has to be done
* here or elsewhere.
*/
if (STREQ(argv[1], "gdb")) {
cmd_set();
return;
}
if (STREQ(argv[1], "output-radix") && argv[2])
pc->output_radix = stol(argv[2], FAULT_ON_ERROR, NULL);
}
/*
* If the command is not restricted, pass it on.
*/
if (!is_restricted_command(*argv, FAULT_ON_ERROR)) {
if (STREQ(pc->command_line, "gdb")) {
strcpy(buf, first_space(pc->orig_line));
strip_beginning_whitespace(buf);
} else
strcpy(buf, pc->orig_line);
if (pc->redirect & (REDIRECT_TO_FILE|REDIRECT_TO_PIPE))
strip_redirection(buf);
if (!gdb_pass_through(buf, NULL, GNU_RETURN_ON_ERROR))
error(INFO, "gdb request failed: %s\n", buf);
}
}
/*
* The gdb target_xfer_memory() has a hook installed to re-route
* all memory accesses back here; reads of 1 or 4 bytes come primarily
* from text disassembly requests, and are diverted to the text cache.
*/
int
gdb_readmem_callback(ulong addr, void *buf, int len, int write)
{
char locbuf[SIZEOF_32BIT], *p1;
int memtype;
ulong readflags;
if (write)
return FALSE;
if (!(pc->cur_req)) {
return(readmem(addr, KVADDR, buf, len,
"gdb_readmem_callback", RETURN_ON_ERROR));
}
if (pc->cur_req->flags & GNU_NO_READMEM)
return TRUE;
readflags = pc->curcmd_flags & PARTIAL_READ_OK ?
RETURN_ON_ERROR|RETURN_PARTIAL : RETURN_ON_ERROR;
if (STREQ(pc->curcmd, "bpf") && pc->curcmd_private &&
(addr > (ulong)pc->curcmd_private))
readflags |= QUIET;
if (pc->curcmd_flags & MEMTYPE_UVADDR)
memtype = UVADDR;
else if (pc->curcmd_flags & MEMTYPE_FILEADDR)
memtype = FILEADDR;
else if (!IS_KVADDR(addr)) {
if (STREQ(pc->curcmd, "gdb") &&
STRNEQ(pc->cur_req->buf, "x/")) {
memtype = UVADDR;
} else {
if (CRASHDEBUG(1))
console("gdb_readmem_callback: %lx %d FAILED\n",
addr, len);
return FALSE;
}
} else
memtype = KVADDR;
if (CRASHDEBUG(1))
console("gdb_readmem_callback[%d]: %lx %d\n",
memtype, addr, len);
if (memtype == FILEADDR)
return(readmem(pc->curcmd_private, memtype, buf, len,
"gdb_readmem_callback", readflags));
switch (len)
{
case SIZEOF_8BIT:
if (STREQ(pc->curcmd, "bt")) {
if (readmem(addr, memtype, buf, SIZEOF_8BIT,
"gdb_readmem_callback", readflags))
return TRUE;
}
p1 = (char *)buf;
if (!readmem(addr, memtype, locbuf, SIZEOF_32BIT,
"gdb_readmem_callback", readflags))
return FALSE;
*p1 = locbuf[0];
return TRUE;
case SIZEOF_32BIT:
if (STREQ(pc->curcmd, "bt")) {
if (readmem(addr, memtype, buf, SIZEOF_32BIT,
"gdb_readmem_callback", readflags))
return TRUE;
}
if (!readmem(addr, memtype, buf, SIZEOF_32BIT,
"gdb_readmem callback", readflags))
return FALSE;
return TRUE;
}
return(readmem(addr, memtype, buf, len,
"gdb_readmem_callback", readflags));
}
/*
* Machine-specific line-number pc section range verifier.
*/
int
gdb_line_number_callback(ulong pc, ulong low, ulong high)
{
if (machdep->verify_line_number)
return machdep->verify_line_number(pc, low, high);
return TRUE;
}
/*
* Prevent gdb from trying to translate and print pointers
* that are not kernel virtual addresses.
*/
int
gdb_print_callback(ulong addr)
{
if (!addr)
return FALSE;
else
return IS_KVADDR(addr);
}
/*
* Used by gdb_interface() to catch gdb-related errors, if desired.
*/
static void
gdb_error_debug(void)
{
char buf1[BUFSIZE];
char buf2[BUFSIZE];
int buffers;
if (CRASHDEBUG(2)) {
sprintf(buf2, "\n");
if (CRASHDEBUG(5) && (buffers = get_embedded()))
sprintf(buf2, "(%d buffer%s in use)\n",
buffers, buffers > 1 ? "s" : "");
fprintf(stderr, "%s: returned via gdb_error_hook %s",
gdb_command_string(pc->cur_gdb_cmd, buf1, TRUE), buf2);
console("%s: returned via gdb_error_hook %s",
gdb_command_string(pc->cur_gdb_cmd, buf1, TRUE), buf2);
}
}
/*
* gdb callback to access debug mode.
*/
int
gdb_CRASHDEBUG(ulong dval)
{
if (CRASHDEBUG(dval))
return TRUE;
return (pc->cur_req && (pc->cur_req->debug >= dval));
}
static ulong
gdb_user_print_option_address(char *name)
{
struct gnu_request request;
request.command = GNU_USER_PRINT_OPTION;
request.name = name;
gdb_command_funnel(&request);
return request.addr;
}
/*
* Try to set a crash scope block based upon the vaddr.
*/
int
gdb_set_crash_scope(ulong vaddr, char *arg)
{
struct gnu_request request, *req = &request;
char name[BUFSIZE];
struct load_module *lm;
if (vaddr) {
if (!is_kernel_text(vaddr)) {
error(INFO, "invalid text address: %s\n", arg);