1
2
3
4
5
6
7
8
9
10
11
12
13
14#include <linux/ctype.h>
15#include <linux/types.h>
16#include <linux/string.h>
17#include <linux/kernel.h>
18#include <linux/kmsg_dump.h>
19#include <linux/reboot.h>
20#include <linux/sched.h>
21#include <linux/sysrq.h>
22#include <linux/smp.h>
23#include <linux/utsname.h>
24#include <linux/vmalloc.h>
25#include <linux/atomic.h>
26#include <linux/module.h>
27#include <linux/moduleparam.h>
28#include <linux/mm.h>
29#include <linux/init.h>
30#include <linux/kallsyms.h>
31#include <linux/kgdb.h>
32#include <linux/kdb.h>
33#include <linux/notifier.h>
34#include <linux/interrupt.h>
35#include <linux/delay.h>
36#include <linux/nmi.h>
37#include <linux/time.h>
38#include <linux/ptrace.h>
39#include <linux/sysctl.h>
40#include <linux/cpu.h>
41#include <linux/kdebug.h>
42#include <linux/proc_fs.h>
43#include <linux/uaccess.h>
44#include <linux/slab.h>
45#include "kdb_private.h"
46
47#undef MODULE_PARAM_PREFIX
48#define MODULE_PARAM_PREFIX "kdb."
49
50static int kdb_cmd_enabled = CONFIG_KDB_DEFAULT_ENABLE;
51module_param_named(cmd_enable, kdb_cmd_enabled, int, 0600);
52
53char kdb_grep_string[KDB_GREP_STRLEN];
54int kdb_grepping_flag;
55EXPORT_SYMBOL(kdb_grepping_flag);
56int kdb_grep_leading;
57int kdb_grep_trailing;
58
59
60
61
62int kdb_flags;
63atomic_t kdb_event;
64
65
66
67
68
69int kdb_initial_cpu = -1;
70int kdb_nextline = 1;
71int kdb_state;
72
73struct task_struct *kdb_current_task;
74EXPORT_SYMBOL(kdb_current_task);
75struct pt_regs *kdb_current_regs;
76
77const char *kdb_diemsg;
78static int kdb_go_count;
79#ifdef CONFIG_KDB_CONTINUE_CATASTROPHIC
80static unsigned int kdb_continue_catastrophic =
81 CONFIG_KDB_CONTINUE_CATASTROPHIC;
82#else
83static unsigned int kdb_continue_catastrophic;
84#endif
85
86
87static kdbtab_t *kdb_commands;
88#define KDB_BASE_CMD_MAX 50
89static int kdb_max_commands = KDB_BASE_CMD_MAX;
90static kdbtab_t kdb_base_commands[KDB_BASE_CMD_MAX];
91#define for_each_kdbcmd(cmd, num) \
92 for ((cmd) = kdb_base_commands, (num) = 0; \
93 num < kdb_max_commands; \
94 num++, num == KDB_BASE_CMD_MAX ? cmd = kdb_commands : cmd++)
95
96typedef struct _kdbmsg {
97 int km_diag;
98 char *km_msg;
99} kdbmsg_t;
100
101#define KDBMSG(msgnum, text) \
102 { KDB_##msgnum, text }
103
104static kdbmsg_t kdbmsgs[] = {
105 KDBMSG(NOTFOUND, "Command Not Found"),
106 KDBMSG(ARGCOUNT, "Improper argument count, see usage."),
107 KDBMSG(BADWIDTH, "Illegal value for BYTESPERWORD use 1, 2, 4 or 8, "
108 "8 is only allowed on 64 bit systems"),
109 KDBMSG(BADRADIX, "Illegal value for RADIX use 8, 10 or 16"),
110 KDBMSG(NOTENV, "Cannot find environment variable"),
111 KDBMSG(NOENVVALUE, "Environment variable should have value"),
112 KDBMSG(NOTIMP, "Command not implemented"),
113 KDBMSG(ENVFULL, "Environment full"),
114 KDBMSG(ENVBUFFULL, "Environment buffer full"),
115 KDBMSG(TOOMANYBPT, "Too many breakpoints defined"),
116#ifdef CONFIG_CPU_XSCALE
117 KDBMSG(TOOMANYDBREGS, "More breakpoints than ibcr registers defined"),
118#else
119 KDBMSG(TOOMANYDBREGS, "More breakpoints than db registers defined"),
120#endif
121 KDBMSG(DUPBPT, "Duplicate breakpoint address"),
122 KDBMSG(BPTNOTFOUND, "Breakpoint not found"),
123 KDBMSG(BADMODE, "Invalid IDMODE"),
124 KDBMSG(BADINT, "Illegal numeric value"),
125 KDBMSG(INVADDRFMT, "Invalid symbolic address format"),
126 KDBMSG(BADREG, "Invalid register name"),
127 KDBMSG(BADCPUNUM, "Invalid cpu number"),
128 KDBMSG(BADLENGTH, "Invalid length field"),
129 KDBMSG(NOBP, "No Breakpoint exists"),
130 KDBMSG(BADADDR, "Invalid address"),
131 KDBMSG(NOPERM, "Permission denied"),
132};
133#undef KDBMSG
134
135static const int __nkdb_err = ARRAY_SIZE(kdbmsgs);
136
137
138
139
140
141
142
143
144
145
146
147
148static char *__env[] = {
149#if defined(CONFIG_SMP)
150 "PROMPT=[%d]kdb> ",
151#else
152 "PROMPT=kdb> ",
153#endif
154 "MOREPROMPT=more> ",
155 "RADIX=16",
156 "MDCOUNT=8",
157 KDB_PLATFORM_ENV,
158 "DTABCOUNT=30",
159 "NOSECT=1",
160 (char *)0,
161 (char *)0,
162 (char *)0,
163 (char *)0,
164 (char *)0,
165 (char *)0,
166 (char *)0,
167 (char *)0,
168 (char *)0,
169 (char *)0,
170 (char *)0,
171 (char *)0,
172 (char *)0,
173 (char *)0,
174 (char *)0,
175 (char *)0,
176 (char *)0,
177 (char *)0,
178 (char *)0,
179 (char *)0,
180 (char *)0,
181 (char *)0,
182 (char *)0,
183 (char *)0,
184};
185
186static const int __nenv = ARRAY_SIZE(__env);
187
188struct task_struct *kdb_curr_task(int cpu)
189{
190 struct task_struct *p = curr_task(cpu);
191#ifdef _TIF_MCA_INIT
192 if ((task_thread_info(p)->flags & _TIF_MCA_INIT) && KDB_TSK(cpu))
193 p = krp->p;
194#endif
195 return p;
196}
197
198
199
200
201
202static inline bool kdb_check_flags(kdb_cmdflags_t flags, int permissions,
203 bool no_args)
204{
205
206 permissions &= KDB_ENABLE_MASK;
207 permissions |= KDB_ENABLE_ALWAYS_SAFE;
208
209
210 if (no_args)
211 permissions |= permissions << KDB_ENABLE_NO_ARGS_SHIFT;
212
213 flags |= KDB_ENABLE_ALL;
214
215 return permissions & flags;
216}
217
218
219
220
221
222
223
224
225
226
227char *kdbgetenv(const char *match)
228{
229 char **ep = __env;
230 int matchlen = strlen(match);
231 int i;
232
233 for (i = 0; i < __nenv; i++) {
234 char *e = *ep++;
235
236 if (!e)
237 continue;
238
239 if ((strncmp(match, e, matchlen) == 0)
240 && ((e[matchlen] == '\0')
241 || (e[matchlen] == '='))) {
242 char *cp = strchr(e, '=');
243 return cp ? ++cp : "";
244 }
245 }
246 return NULL;
247}
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265static char *kdballocenv(size_t bytes)
266{
267#define KDB_ENVBUFSIZE 512
268 static char envbuffer[KDB_ENVBUFSIZE];
269 static int envbufsize;
270 char *ep = NULL;
271
272 if ((KDB_ENVBUFSIZE - envbufsize) >= bytes) {
273 ep = &envbuffer[envbufsize];
274 envbufsize += bytes;
275 }
276 return ep;
277}
278
279
280
281
282
283
284
285
286
287
288
289static int kdbgetulenv(const char *match, unsigned long *value)
290{
291 char *ep;
292
293 ep = kdbgetenv(match);
294 if (!ep)
295 return KDB_NOTENV;
296 if (strlen(ep) == 0)
297 return KDB_NOENVVALUE;
298
299 *value = simple_strtoul(ep, NULL, 0);
300
301 return 0;
302}
303
304
305
306
307
308
309
310
311
312
313
314int kdbgetintenv(const char *match, int *value)
315{
316 unsigned long val;
317 int diag;
318
319 diag = kdbgetulenv(match, &val);
320 if (!diag)
321 *value = (int) val;
322 return diag;
323}
324
325
326
327
328
329
330
331
332
333
334
335int kdbgetularg(const char *arg, unsigned long *value)
336{
337 char *endp;
338 unsigned long val;
339
340 val = simple_strtoul(arg, &endp, 0);
341
342 if (endp == arg) {
343
344
345
346
347 val = simple_strtoul(arg, &endp, 16);
348 if (endp == arg)
349 return KDB_BADINT;
350 }
351
352 *value = val;
353
354 return 0;
355}
356
357int kdbgetu64arg(const char *arg, u64 *value)
358{
359 char *endp;
360 u64 val;
361
362 val = simple_strtoull(arg, &endp, 0);
363
364 if (endp == arg) {
365
366 val = simple_strtoull(arg, &endp, 16);
367 if (endp == arg)
368 return KDB_BADINT;
369 }
370
371 *value = val;
372
373 return 0;
374}
375
376
377
378
379
380int kdb_set(int argc, const char **argv)
381{
382 int i;
383 char *ep;
384 size_t varlen, vallen;
385
386
387
388
389
390
391
392 if (argc == 3) {
393 argv[2] = argv[3];
394 argc--;
395 }
396
397 if (argc != 2)
398 return KDB_ARGCOUNT;
399
400
401
402
403 if (strcmp(argv[1], "KDBDEBUG") == 0) {
404 unsigned int debugflags;
405 char *cp;
406
407 debugflags = simple_strtoul(argv[2], &cp, 0);
408 if (cp == argv[2] || debugflags & ~KDB_DEBUG_FLAG_MASK) {
409 kdb_printf("kdb: illegal debug flags '%s'\n",
410 argv[2]);
411 return 0;
412 }
413 kdb_flags = (kdb_flags &
414 ~(KDB_DEBUG_FLAG_MASK << KDB_DEBUG_FLAG_SHIFT))
415 | (debugflags << KDB_DEBUG_FLAG_SHIFT);
416
417 return 0;
418 }
419
420
421
422
423
424 varlen = strlen(argv[1]);
425 vallen = strlen(argv[2]);
426 ep = kdballocenv(varlen + vallen + 2);
427 if (ep == (char *)0)
428 return KDB_ENVBUFFULL;
429
430 sprintf(ep, "%s=%s", argv[1], argv[2]);
431
432 ep[varlen+vallen+1] = '\0';
433
434 for (i = 0; i < __nenv; i++) {
435 if (__env[i]
436 && ((strncmp(__env[i], argv[1], varlen) == 0)
437 && ((__env[i][varlen] == '\0')
438 || (__env[i][varlen] == '=')))) {
439 __env[i] = ep;
440 return 0;
441 }
442 }
443
444
445
446
447 for (i = 0; i < __nenv-1; i++) {
448 if (__env[i] == (char *)0) {
449 __env[i] = ep;
450 return 0;
451 }
452 }
453
454 return KDB_ENVFULL;
455}
456
457static int kdb_check_regs(void)
458{
459 if (!kdb_current_regs) {
460 kdb_printf("No current kdb registers."
461 " You may need to select another task\n");
462 return KDB_BADREG;
463 }
464 return 0;
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
492int kdbgetaddrarg(int argc, const char **argv, int *nextarg,
493 unsigned long *value, long *offset,
494 char **name)
495{
496 unsigned long addr;
497 unsigned long off = 0;
498 int positive;
499 int diag;
500 int found = 0;
501 char *symname;
502 char symbol = '\0';
503 char *cp;
504 kdb_symtab_t symtab;
505
506
507
508
509
510
511 if (!kdb_check_flags(KDB_ENABLE_MEM_READ | KDB_ENABLE_FLOW_CTRL,
512 kdb_cmd_enabled, false))
513 return KDB_NOPERM;
514
515
516
517
518
519
520
521
522
523 if (*nextarg > argc)
524 return KDB_ARGCOUNT;
525
526 symname = (char *)argv[*nextarg];
527
528
529
530
531
532
533
534 cp = strpbrk(symname, "+-");
535 if (cp != NULL) {
536 symbol = *cp;
537 *cp++ = '\0';
538 }
539
540 if (symname[0] == '$') {
541 diag = kdbgetulenv(&symname[1], &addr);
542 if (diag)
543 return diag;
544 } else if (symname[0] == '%') {
545 diag = kdb_check_regs();
546 if (diag)
547 return diag;
548
549
550
551 return KDB_NOTIMP;
552 } else {
553 found = kdbgetsymval(symname, &symtab);
554 if (found) {
555 addr = symtab.sym_start;
556 } else {
557 diag = kdbgetularg(argv[*nextarg], &addr);
558 if (diag)
559 return diag;
560 }
561 }
562
563 if (!found)
564 found = kdbnearsym(addr, &symtab);
565
566 (*nextarg)++;
567
568 if (name)
569 *name = symname;
570 if (value)
571 *value = addr;
572 if (offset && name && *name)
573 *offset = addr - symtab.sym_start;
574
575 if ((*nextarg > argc)
576 && (symbol == '\0'))
577 return 0;
578
579
580
581
582
583 if (symbol == '\0') {
584 if ((argv[*nextarg][0] != '+')
585 && (argv[*nextarg][0] != '-')) {
586
587
588
589 return 0;
590 } else {
591 positive = (argv[*nextarg][0] == '+');
592 (*nextarg)++;
593 }
594 } else
595 positive = (symbol == '+');
596
597
598
599
600 if ((*nextarg > argc)
601 && (symbol == '\0')) {
602 return KDB_INVADDRFMT;
603 }
604
605 if (!symbol) {
606 cp = (char *)argv[*nextarg];
607 (*nextarg)++;
608 }
609
610 diag = kdbgetularg(cp, &off);
611 if (diag)
612 return diag;
613
614 if (!positive)
615 off = -off;
616
617 if (offset)
618 *offset += off;
619
620 if (value)
621 *value += off;
622
623 return 0;
624}
625
626static void kdb_cmderror(int diag)
627{
628 int i;
629
630 if (diag >= 0) {
631 kdb_printf("no error detected (diagnostic is %d)\n", diag);
632 return;
633 }
634
635 for (i = 0; i < __nkdb_err; i++) {
636 if (kdbmsgs[i].km_diag == diag) {
637 kdb_printf("diag: %d: %s\n", diag, kdbmsgs[i].km_msg);
638 return;
639 }
640 }
641
642 kdb_printf("Unknown diag %d\n", -diag);
643}
644
645
646
647
648
649
650
651
652
653
654
655
656
657struct defcmd_set {
658 int count;
659 int usable;
660 char *name;
661 char *usage;
662 char *help;
663 char **command;
664};
665static struct defcmd_set *defcmd_set;
666static int defcmd_set_count;
667static int defcmd_in_progress;
668
669
670static int kdb_exec_defcmd(int argc, const char **argv);
671
672static int kdb_defcmd2(const char *cmdstr, const char *argv0)
673{
674 struct defcmd_set *s = defcmd_set + defcmd_set_count - 1;
675 char **save_command = s->command;
676 if (strcmp(argv0, "endefcmd") == 0) {
677 defcmd_in_progress = 0;
678 if (!s->count)
679 s->usable = 0;
680 if (s->usable)
681
682
683
684
685 kdb_register_flags(s->name, kdb_exec_defcmd, s->usage,
686 s->help, 0,
687 KDB_ENABLE_ALWAYS_SAFE);
688 return 0;
689 }
690 if (!s->usable)
691 return KDB_NOTIMP;
692 s->command = kzalloc((s->count + 1) * sizeof(*(s->command)), GFP_KDB);
693 if (!s->command) {
694 kdb_printf("Could not allocate new kdb_defcmd table for %s\n",
695 cmdstr);
696 s->usable = 0;
697 return KDB_NOTIMP;
698 }
699 memcpy(s->command, save_command, s->count * sizeof(*(s->command)));
700 s->command[s->count++] = kdb_strdup(cmdstr, GFP_KDB);
701 kfree(save_command);
702 return 0;
703}
704
705static int kdb_defcmd(int argc, const char **argv)
706{
707 struct defcmd_set *save_defcmd_set = defcmd_set, *s;
708 if (defcmd_in_progress) {
709 kdb_printf("kdb: nested defcmd detected, assuming missing "
710 "endefcmd\n");
711 kdb_defcmd2("endefcmd", "endefcmd");
712 }
713 if (argc == 0) {
714 int i;
715 for (s = defcmd_set; s < defcmd_set + defcmd_set_count; ++s) {
716 kdb_printf("defcmd %s \"%s\" \"%s\"\n", s->name,
717 s->usage, s->help);
718 for (i = 0; i < s->count; ++i)
719 kdb_printf("%s", s->command[i]);
720 kdb_printf("endefcmd\n");
721 }
722 return 0;
723 }
724 if (argc != 3)
725 return KDB_ARGCOUNT;
726 if (in_dbg_master()) {
727 kdb_printf("Command only available during kdb_init()\n");
728 return KDB_NOTIMP;
729 }
730 defcmd_set = kmalloc((defcmd_set_count + 1) * sizeof(*defcmd_set),
731 GFP_KDB);
732 if (!defcmd_set)
733 goto fail_defcmd;
734 memcpy(defcmd_set, save_defcmd_set,
735 defcmd_set_count * sizeof(*defcmd_set));
736 s = defcmd_set + defcmd_set_count;
737 memset(s, 0, sizeof(*s));
738 s->usable = 1;
739 s->name = kdb_strdup(argv[1], GFP_KDB);
740 if (!s->name)
741 goto fail_name;
742 s->usage = kdb_strdup(argv[2], GFP_KDB);
743 if (!s->usage)
744 goto fail_usage;
745 s->help = kdb_strdup(argv[3], GFP_KDB);
746 if (!s->help)
747 goto fail_help;
748 if (s->usage[0] == '"') {
749 strcpy(s->usage, argv[2]+1);
750 s->usage[strlen(s->usage)-1] = '\0';
751 }
752 if (s->help[0] == '"') {
753 strcpy(s->help, argv[3]+1);
754 s->help[strlen(s->help)-1] = '\0';
755 }
756 ++defcmd_set_count;
757 defcmd_in_progress = 1;
758 kfree(save_defcmd_set);
759 return 0;
760fail_help:
761 kfree(s->usage);
762fail_usage:
763 kfree(s->name);
764fail_name:
765 kfree(defcmd_set);
766fail_defcmd:
767 kdb_printf("Could not allocate new defcmd_set entry for %s\n", argv[1]);
768 defcmd_set = save_defcmd_set;
769 return KDB_NOTIMP;
770}
771
772
773
774
775
776
777
778
779
780
781static int kdb_exec_defcmd(int argc, const char **argv)
782{
783 int i, ret;
784 struct defcmd_set *s;
785 if (argc != 0)
786 return KDB_ARGCOUNT;
787 for (s = defcmd_set, i = 0; i < defcmd_set_count; ++i, ++s) {
788 if (strcmp(s->name, argv[0]) == 0)
789 break;
790 }
791 if (i == defcmd_set_count) {
792 kdb_printf("kdb_exec_defcmd: could not find commands for %s\n",
793 argv[0]);
794 return KDB_NOTIMP;
795 }
796 for (i = 0; i < s->count; ++i) {
797
798
799 argv = NULL;
800 kdb_printf("[%s]kdb> %s\n", s->name, s->command[i]);
801 ret = kdb_parse(s->command[i]);
802 if (ret)
803 return ret;
804 }
805 return 0;
806}
807
808
809#define KDB_CMD_HISTORY_COUNT 32
810#define CMD_BUFLEN 200
811
812static unsigned int cmd_head, cmd_tail;
813static unsigned int cmdptr;
814static char cmd_hist[KDB_CMD_HISTORY_COUNT][CMD_BUFLEN];
815static char cmd_cur[CMD_BUFLEN];
816
817
818
819
820static void parse_grep(const char *str)
821{
822 int len;
823 char *cp = (char *)str, *cp2;
824
825
826 if (*cp != '|')
827 return;
828 cp++;
829 while (isspace(*cp))
830 cp++;
831 if (strncmp(cp, "grep ", 5)) {
832 kdb_printf("invalid 'pipe', see grephelp\n");
833 return;
834 }
835 cp += 5;
836 while (isspace(*cp))
837 cp++;
838 cp2 = strchr(cp, '\n');
839 if (cp2)
840 *cp2 = '\0';
841 len = strlen(cp);
842 if (len == 0) {
843 kdb_printf("invalid 'pipe', see grephelp\n");
844 return;
845 }
846
847 if (*cp == '"') {
848
849
850 cp++;
851 cp2 = strchr(cp, '"');
852 if (!cp2) {
853 kdb_printf("invalid quoted string, see grephelp\n");
854 return;
855 }
856 *cp2 = '\0';
857 }
858 kdb_grep_leading = 0;
859 if (*cp == '^') {
860 kdb_grep_leading = 1;
861 cp++;
862 }
863 len = strlen(cp);
864 kdb_grep_trailing = 0;
865 if (*(cp+len-1) == '$') {
866 kdb_grep_trailing = 1;
867 *(cp+len-1) = '\0';
868 }
869 len = strlen(cp);
870 if (!len)
871 return;
872 if (len >= KDB_GREP_STRLEN) {
873 kdb_printf("search string too long\n");
874 return;
875 }
876 strcpy(kdb_grep_string, cp);
877 kdb_grepping_flag++;
878 return;
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#define MAXARGC 20
908
909int kdb_parse(const char *cmdstr)
910{
911 static char *argv[MAXARGC];
912 static int argc;
913 static char cbuf[CMD_BUFLEN+2];
914 char *cp;
915 char *cpp, quoted;
916 kdbtab_t *tp;
917 int i, escaped, ignore_errors = 0, check_grep = 0;
918
919
920
921
922 cp = (char *)cmdstr;
923
924 if (KDB_FLAG(CMD_INTERRUPT)) {
925
926
927 KDB_FLAG_CLEAR(CMD_INTERRUPT);
928 KDB_STATE_SET(PAGER);
929 argc = 0;
930 }
931
932 if (*cp != '\n' && *cp != '\0') {
933 argc = 0;
934 cpp = cbuf;
935 while (*cp) {
936
937 while (isspace(*cp))
938 cp++;
939 if ((*cp == '\0') || (*cp == '\n') ||
940 (*cp == '#' && !defcmd_in_progress))
941 break;
942
943 if (*cp == '|') {
944 check_grep++;
945 break;
946 }
947 if (cpp >= cbuf + CMD_BUFLEN) {
948 kdb_printf("kdb_parse: command buffer "
949 "overflow, command ignored\n%s\n",
950 cmdstr);
951 return KDB_NOTFOUND;
952 }
953 if (argc >= MAXARGC - 1) {
954 kdb_printf("kdb_parse: too many arguments, "
955 "command ignored\n%s\n", cmdstr);
956 return KDB_NOTFOUND;
957 }
958 argv[argc++] = cpp;
959 escaped = 0;
960 quoted = '\0';
961
962
963 while (*cp && *cp != '\n' &&
964 (escaped || quoted || !isspace(*cp))) {
965 if (cpp >= cbuf + CMD_BUFLEN)
966 break;
967 if (escaped) {
968 escaped = 0;
969 *cpp++ = *cp++;
970 continue;
971 }
972 if (*cp == '\\') {
973 escaped = 1;
974 ++cp;
975 continue;
976 }
977 if (*cp == quoted)
978 quoted = '\0';
979 else if (*cp == '\'' || *cp == '"')
980 quoted = *cp;
981 *cpp = *cp++;
982 if (*cpp == '=' && !quoted)
983 break;
984 ++cpp;
985 }
986 *cpp++ = '\0';
987 }
988 }
989 if (!argc)
990 return 0;
991 if (check_grep)
992 parse_grep(cp);
993 if (defcmd_in_progress) {
994 int result = kdb_defcmd2(cmdstr, argv[0]);
995 if (!defcmd_in_progress) {
996 argc = 0;
997 *(argv[0]) = '\0';
998 }
999 return result;
1000 }
1001 if (argv[0][0] == '-' && argv[0][1] &&
1002 (argv[0][1] < '0' || argv[0][1] > '9')) {
1003 ignore_errors = 1;
1004 ++argv[0];
1005 }
1006
1007 for_each_kdbcmd(tp, i) {
1008 if (tp->cmd_name) {
1009
1010
1011
1012
1013
1014 if (tp->cmd_minlen
1015 && (strlen(argv[0]) <= tp->cmd_minlen)) {
1016 if (strncmp(argv[0],
1017 tp->cmd_name,
1018 tp->cmd_minlen) == 0) {
1019 break;
1020 }
1021 }
1022
1023 if (strcmp(argv[0], tp->cmd_name) == 0)
1024 break;
1025 }
1026 }
1027
1028
1029
1030
1031
1032
1033 if (i == kdb_max_commands) {
1034 for_each_kdbcmd(tp, i) {
1035 if (tp->cmd_name) {
1036 if (strncmp(argv[0],
1037 tp->cmd_name,
1038 strlen(tp->cmd_name)) == 0) {
1039 break;
1040 }
1041 }
1042 }
1043 }
1044
1045 if (i < kdb_max_commands) {
1046 int result;
1047
1048 if (!kdb_check_flags(tp->cmd_flags, kdb_cmd_enabled, argc <= 1))
1049 return KDB_NOPERM;
1050
1051 KDB_STATE_SET(CMD);
1052 result = (*tp->cmd_func)(argc-1, (const char **)argv);
1053 if (result && ignore_errors && result > KDB_CMD_GO)
1054 result = 0;
1055 KDB_STATE_CLEAR(CMD);
1056
1057 if (tp->cmd_flags & KDB_REPEAT_WITH_ARGS)
1058 return result;
1059
1060 argc = tp->cmd_flags & KDB_REPEAT_NO_ARGS ? 1 : 0;
1061 if (argv[argc])
1062 *(argv[argc]) = '\0';
1063 return result;
1064 }
1065
1066
1067
1068
1069
1070
1071
1072
1073 {
1074 unsigned long value;
1075 char *name = NULL;
1076 long offset;
1077 int nextarg = 0;
1078
1079 if (kdbgetaddrarg(0, (const char **)argv, &nextarg,
1080 &value, &offset, &name)) {
1081 return KDB_NOTFOUND;
1082 }
1083
1084 kdb_printf("%s = ", argv[0]);
1085 kdb_symbol_print(value, NULL, KDB_SP_DEFAULT);
1086 kdb_printf("\n");
1087 return 0;
1088 }
1089}
1090
1091
1092static int handle_ctrl_cmd(char *cmd)
1093{
1094#define CTRL_P 16
1095#define CTRL_N 14
1096
1097
1098 if (cmd_head == cmd_tail)
1099 return 0;
1100 switch (*cmd) {
1101 case CTRL_P:
1102 if (cmdptr != cmd_tail)
1103 cmdptr = (cmdptr-1) % KDB_CMD_HISTORY_COUNT;
1104 strncpy(cmd_cur, cmd_hist[cmdptr], CMD_BUFLEN);
1105 return 1;
1106 case CTRL_N:
1107 if (cmdptr != cmd_head)
1108 cmdptr = (cmdptr+1) % KDB_CMD_HISTORY_COUNT;
1109 strncpy(cmd_cur, cmd_hist[cmdptr], CMD_BUFLEN);
1110 return 1;
1111 }
1112 return 0;
1113}
1114
1115
1116
1117
1118
1119static int kdb_reboot(int argc, const char **argv)
1120{
1121 emergency_restart();
1122 kdb_printf("Hmm, kdb_reboot did not reboot, spinning here\n");
1123 while (1)
1124 cpu_relax();
1125
1126 return 0;
1127}
1128
1129static void kdb_dumpregs(struct pt_regs *regs)
1130{
1131 int old_lvl = console_loglevel;
1132 console_loglevel = CONSOLE_LOGLEVEL_MOTORMOUTH;
1133 kdb_trap_printk++;
1134 show_regs(regs);
1135 kdb_trap_printk--;
1136 kdb_printf("\n");
1137 console_loglevel = old_lvl;
1138}
1139
1140void kdb_set_current_task(struct task_struct *p)
1141{
1142 kdb_current_task = p;
1143
1144 if (kdb_task_has_cpu(p)) {
1145 kdb_current_regs = KDB_TSKREGS(kdb_process_cpu(p));
1146 return;
1147 }
1148 kdb_current_regs = NULL;
1149}
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170static int kdb_local(kdb_reason_t reason, int error, struct pt_regs *regs,
1171 kdb_dbtrap_t db_result)
1172{
1173 char *cmdbuf;
1174 int diag;
1175 struct task_struct *kdb_current =
1176 kdb_curr_task(raw_smp_processor_id());
1177
1178 KDB_DEBUG_STATE("kdb_local 1", reason);
1179 kdb_go_count = 0;
1180 if (reason == KDB_REASON_DEBUG) {
1181
1182 } else {
1183 kdb_printf("\nEntering kdb (current=0x%p, pid %d) ",
1184 kdb_current, kdb_current ? kdb_current->pid : 0);
1185#if defined(CONFIG_SMP)
1186 kdb_printf("on processor %d ", raw_smp_processor_id());
1187#endif
1188 }
1189
1190 switch (reason) {
1191 case KDB_REASON_DEBUG:
1192 {
1193
1194
1195
1196
1197 switch (db_result) {
1198 case KDB_DB_BPT:
1199 kdb_printf("\nEntering kdb (0x%p, pid %d) ",
1200 kdb_current, kdb_current->pid);
1201#if defined(CONFIG_SMP)
1202 kdb_printf("on processor %d ", raw_smp_processor_id());
1203#endif
1204 kdb_printf("due to Debug @ " kdb_machreg_fmt "\n",
1205 instruction_pointer(regs));
1206 break;
1207 case KDB_DB_SS:
1208 break;
1209 case KDB_DB_SSBPT:
1210 KDB_DEBUG_STATE("kdb_local 4", reason);
1211 return 1;
1212 default:
1213 kdb_printf("kdb: Bad result from kdba_db_trap: %d\n",
1214 db_result);
1215 break;
1216 }
1217
1218 }
1219 break;
1220 case KDB_REASON_ENTER:
1221 if (KDB_STATE(KEYBOARD))
1222 kdb_printf("due to Keyboard Entry\n");
1223 else
1224 kdb_printf("due to KDB_ENTER()\n");
1225 break;
1226 case KDB_REASON_KEYBOARD:
1227 KDB_STATE_SET(KEYBOARD);
1228 kdb_printf("due to Keyboard Entry\n");
1229 break;
1230 case KDB_REASON_ENTER_SLAVE:
1231
1232 case KDB_REASON_SWITCH:
1233 kdb_printf("due to cpu switch\n");
1234 break;
1235 case KDB_REASON_OOPS:
1236 kdb_printf("Oops: %s\n", kdb_diemsg);
1237 kdb_printf("due to oops @ " kdb_machreg_fmt "\n",
1238 instruction_pointer(regs));
1239 kdb_dumpregs(regs);
1240 break;
1241 case KDB_REASON_SYSTEM_NMI:
1242 kdb_printf("due to System NonMaskable Interrupt\n");
1243 break;
1244 case KDB_REASON_NMI:
1245 kdb_printf("due to NonMaskable Interrupt @ "
1246 kdb_machreg_fmt "\n",
1247 instruction_pointer(regs));
1248 break;
1249 case KDB_REASON_SSTEP:
1250 case KDB_REASON_BREAK:
1251 kdb_printf("due to %s @ " kdb_machreg_fmt "\n",
1252 reason == KDB_REASON_BREAK ?
1253 "Breakpoint" : "SS trap", instruction_pointer(regs));
1254
1255
1256
1257
1258 if (db_result != KDB_DB_BPT) {
1259 kdb_printf("kdb: error return from kdba_bp_trap: %d\n",
1260 db_result);
1261 KDB_DEBUG_STATE("kdb_local 6", reason);
1262 return 0;
1263 }
1264 break;
1265 case KDB_REASON_RECURSE:
1266 kdb_printf("due to Recursion @ " kdb_machreg_fmt "\n",
1267 instruction_pointer(regs));
1268 break;
1269 default:
1270 kdb_printf("kdb: unexpected reason code: %d\n", reason);
1271 KDB_DEBUG_STATE("kdb_local 8", reason);
1272 return 0;
1273 }
1274
1275 while (1) {
1276
1277
1278
1279 kdb_nextline = 1;
1280 KDB_STATE_CLEAR(SUPPRESS);
1281 kdb_grepping_flag = 0;
1282
1283 kdb_grep_string[0] = '\0';
1284
1285 cmdbuf = cmd_cur;
1286 *cmdbuf = '\0';
1287 *(cmd_hist[cmd_head]) = '\0';
1288
1289do_full_getstr:
1290#if defined(CONFIG_SMP)
1291 snprintf(kdb_prompt_str, CMD_BUFLEN, kdbgetenv("PROMPT"),
1292 raw_smp_processor_id());
1293#else
1294 snprintf(kdb_prompt_str, CMD_BUFLEN, kdbgetenv("PROMPT"));
1295#endif
1296 if (defcmd_in_progress)
1297 strncat(kdb_prompt_str, "[defcmd]", CMD_BUFLEN);
1298
1299
1300
1301
1302 cmdbuf = kdb_getstr(cmdbuf, CMD_BUFLEN, kdb_prompt_str);
1303 if (*cmdbuf != '\n') {
1304 if (*cmdbuf < 32) {
1305 if (cmdptr == cmd_head) {
1306 strncpy(cmd_hist[cmd_head], cmd_cur,
1307 CMD_BUFLEN);
1308 *(cmd_hist[cmd_head] +
1309 strlen(cmd_hist[cmd_head])-1) = '\0';
1310 }
1311 if (!handle_ctrl_cmd(cmdbuf))
1312 *(cmd_cur+strlen(cmd_cur)-1) = '\0';
1313 cmdbuf = cmd_cur;
1314 goto do_full_getstr;
1315 } else {
1316 strncpy(cmd_hist[cmd_head], cmd_cur,
1317 CMD_BUFLEN);
1318 }
1319
1320 cmd_head = (cmd_head+1) % KDB_CMD_HISTORY_COUNT;
1321 if (cmd_head == cmd_tail)
1322 cmd_tail = (cmd_tail+1) % KDB_CMD_HISTORY_COUNT;
1323 }
1324
1325 cmdptr = cmd_head;
1326 diag = kdb_parse(cmdbuf);
1327 if (diag == KDB_NOTFOUND) {
1328 kdb_printf("Unknown kdb command: '%s'\n", cmdbuf);
1329 diag = 0;
1330 }
1331 if (diag == KDB_CMD_GO
1332 || diag == KDB_CMD_CPU
1333 || diag == KDB_CMD_SS
1334 || diag == KDB_CMD_KGDB)
1335 break;
1336
1337 if (diag)
1338 kdb_cmderror(diag);
1339 }
1340 KDB_DEBUG_STATE("kdb_local 9", diag);
1341 return diag;
1342}
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352void kdb_print_state(const char *text, int value)
1353{
1354 kdb_printf("state: %s cpu %d value %d initial %d state %x\n",
1355 text, raw_smp_processor_id(), value, kdb_initial_cpu,
1356 kdb_state);
1357}
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384int kdb_main_loop(kdb_reason_t reason, kdb_reason_t reason2, int error,
1385 kdb_dbtrap_t db_result, struct pt_regs *regs)
1386{
1387 int result = 1;
1388
1389 while (1) {
1390
1391
1392
1393
1394 KDB_DEBUG_STATE("kdb_main_loop 1", reason);
1395 while (KDB_STATE(HOLD_CPU)) {
1396
1397
1398
1399
1400 if (!KDB_STATE(KDB))
1401 KDB_STATE_SET(KDB);
1402 }
1403
1404 KDB_STATE_CLEAR(SUPPRESS);
1405 KDB_DEBUG_STATE("kdb_main_loop 2", reason);
1406 if (KDB_STATE(LEAVING))
1407 break;
1408
1409 result = kdb_local(reason2, error, regs, db_result);
1410 KDB_DEBUG_STATE("kdb_main_loop 3", result);
1411
1412 if (result == KDB_CMD_CPU)
1413 break;
1414
1415 if (result == KDB_CMD_SS) {
1416 KDB_STATE_SET(DOING_SS);
1417 break;
1418 }
1419
1420 if (result == KDB_CMD_KGDB) {
1421 if (!KDB_STATE(DOING_KGDB))
1422 kdb_printf("Entering please attach debugger "
1423 "or use $D#44+ or $3#33\n");
1424 break;
1425 }
1426 if (result && result != 1 && result != KDB_CMD_GO)
1427 kdb_printf("\nUnexpected kdb_local return code %d\n",
1428 result);
1429 KDB_DEBUG_STATE("kdb_main_loop 4", reason);
1430 break;
1431 }
1432 if (KDB_STATE(DOING_SS))
1433 KDB_STATE_CLEAR(SSBPT);
1434
1435
1436 kdb_kbd_cleanup_state();
1437
1438 return result;
1439}
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451static int kdb_mdr(unsigned long addr, unsigned int count)
1452{
1453 unsigned char c;
1454 while (count--) {
1455 if (kdb_getarea(c, addr))
1456 return 0;
1457 kdb_printf("%02x", c);
1458 addr++;
1459 }
1460 kdb_printf("\n");
1461 return 0;
1462}
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474static void kdb_md_line(const char *fmtstr, unsigned long addr,
1475 int symbolic, int nosect, int bytesperword,
1476 int num, int repeat, int phys)
1477{
1478
1479 kdb_symtab_t symtab;
1480 char cbuf[32];
1481 char *c = cbuf;
1482 int i;
1483 unsigned long word;
1484
1485 memset(cbuf, '\0', sizeof(cbuf));
1486 if (phys)
1487 kdb_printf("phys " kdb_machreg_fmt0 " ", addr);
1488 else
1489 kdb_printf(kdb_machreg_fmt0 " ", addr);
1490
1491 for (i = 0; i < num && repeat--; i++) {
1492 if (phys) {
1493 if (kdb_getphysword(&word, addr, bytesperword))
1494 break;
1495 } else if (kdb_getword(&word, addr, bytesperword))
1496 break;
1497 kdb_printf(fmtstr, word);
1498 if (symbolic)
1499 kdbnearsym(word, &symtab);
1500 else
1501 memset(&symtab, 0, sizeof(symtab));
1502 if (symtab.sym_name) {
1503 kdb_symbol_print(word, &symtab, 0);
1504 if (!nosect) {
1505 kdb_printf("\n");
1506 kdb_printf(" %s %s "
1507 kdb_machreg_fmt " "
1508 kdb_machreg_fmt " "
1509 kdb_machreg_fmt, symtab.mod_name,
1510 symtab.sec_name, symtab.sec_start,
1511 symtab.sym_start, symtab.sym_end);
1512 }
1513 addr += bytesperword;
1514 } else {
1515 union {
1516 u64 word;
1517 unsigned char c[8];
1518 } wc;
1519 unsigned char *cp;
1520#ifdef __BIG_ENDIAN
1521 cp = wc.c + 8 - bytesperword;
1522#else
1523 cp = wc.c;
1524#endif
1525 wc.word = word;
1526#define printable_char(c) \
1527 ({unsigned char __c = c; isascii(__c) && isprint(__c) ? __c : '.'; })
1528 switch (bytesperword) {
1529 case 8:
1530 *c++ = printable_char(*cp++);
1531 *c++ = printable_char(*cp++);
1532 *c++ = printable_char(*cp++);
1533 *c++ = printable_char(*cp++);
1534 addr += 4;
1535 case 4:
1536 *c++ = printable_char(*cp++);
1537 *c++ = printable_char(*cp++);
1538 addr += 2;
1539 case 2:
1540 *c++ = printable_char(*cp++);
1541 addr++;
1542 case 1:
1543 *c++ = printable_char(*cp++);
1544 addr++;
1545 break;
1546 }
1547#undef printable_char
1548 }
1549 }
1550 kdb_printf("%*s %s\n", (int)((num-i)*(2*bytesperword + 1)+1),
1551 " ", cbuf);
1552}
1553
1554static int kdb_md(int argc, const char **argv)
1555{
1556 static unsigned long last_addr;
1557 static int last_radix, last_bytesperword, last_repeat;
1558 int radix = 16, mdcount = 8, bytesperword = KDB_WORD_SIZE, repeat;
1559 int nosect = 0;
1560 char fmtchar, fmtstr[64];
1561 unsigned long addr;
1562 unsigned long word;
1563 long offset = 0;
1564 int symbolic = 0;
1565 int valid = 0;
1566 int phys = 0;
1567
1568 kdbgetintenv("MDCOUNT", &mdcount);
1569 kdbgetintenv("RADIX", &radix);
1570 kdbgetintenv("BYTESPERWORD", &bytesperword);
1571
1572
1573 repeat = mdcount * 16 / bytesperword;
1574
1575 if (strcmp(argv[0], "mdr") == 0) {
1576 if (argc != 2)
1577 return KDB_ARGCOUNT;
1578 valid = 1;
1579 } else if (isdigit(argv[0][2])) {
1580 bytesperword = (int)(argv[0][2] - '0');
1581 if (bytesperword == 0) {
1582 bytesperword = last_bytesperword;
1583 if (bytesperword == 0)
1584 bytesperword = 4;
1585 }
1586 last_bytesperword = bytesperword;
1587 repeat = mdcount * 16 / bytesperword;
1588 if (!argv[0][3])
1589 valid = 1;
1590 else if (argv[0][3] == 'c' && argv[0][4]) {
1591 char *p;
1592 repeat = simple_strtoul(argv[0] + 4, &p, 10);
1593 mdcount = ((repeat * bytesperword) + 15) / 16;
1594 valid = !*p;
1595 }
1596 last_repeat = repeat;
1597 } else if (strcmp(argv[0], "md") == 0)
1598 valid = 1;
1599 else if (strcmp(argv[0], "mds") == 0)
1600 valid = 1;
1601 else if (strcmp(argv[0], "mdp") == 0) {
1602 phys = valid = 1;
1603 }
1604 if (!valid)
1605 return KDB_NOTFOUND;
1606
1607 if (argc == 0) {
1608 if (last_addr == 0)
1609 return KDB_ARGCOUNT;
1610 addr = last_addr;
1611 radix = last_radix;
1612 bytesperword = last_bytesperword;
1613 repeat = last_repeat;
1614 mdcount = ((repeat * bytesperword) + 15) / 16;
1615 }
1616
1617 if (argc) {
1618 unsigned long val;
1619 int diag, nextarg = 1;
1620 diag = kdbgetaddrarg(argc, argv, &nextarg, &addr,
1621 &offset, NULL);
1622 if (diag)
1623 return diag;
1624 if (argc > nextarg+2)
1625 return KDB_ARGCOUNT;
1626
1627 if (argc >= nextarg) {
1628 diag = kdbgetularg(argv[nextarg], &val);
1629 if (!diag) {
1630 mdcount = (int) val;
1631 repeat = mdcount * 16 / bytesperword;
1632 }
1633 }
1634 if (argc >= nextarg+1) {
1635 diag = kdbgetularg(argv[nextarg+1], &val);
1636 if (!diag)
1637 radix = (int) val;
1638 }
1639 }
1640
1641 if (strcmp(argv[0], "mdr") == 0)
1642 return kdb_mdr(addr, mdcount);
1643
1644 switch (radix) {
1645 case 10:
1646 fmtchar = 'd';
1647 break;
1648 case 16:
1649 fmtchar = 'x';
1650 break;
1651 case 8:
1652 fmtchar = 'o';
1653 break;
1654 default:
1655 return KDB_BADRADIX;
1656 }
1657
1658 last_radix = radix;
1659
1660 if (bytesperword > KDB_WORD_SIZE)
1661 return KDB_BADWIDTH;
1662
1663 switch (bytesperword) {
1664 case 8:
1665 sprintf(fmtstr, "%%16.16l%c ", fmtchar);
1666 break;
1667 case 4:
1668 sprintf(fmtstr, "%%8.8l%c ", fmtchar);
1669 break;
1670 case 2:
1671 sprintf(fmtstr, "%%4.4l%c ", fmtchar);
1672 break;
1673 case 1:
1674 sprintf(fmtstr, "%%2.2l%c ", fmtchar);
1675 break;
1676 default:
1677 return KDB_BADWIDTH;
1678 }
1679
1680 last_repeat = repeat;
1681 last_bytesperword = bytesperword;
1682
1683 if (strcmp(argv[0], "mds") == 0) {
1684 symbolic = 1;
1685
1686
1687
1688 bytesperword = KDB_WORD_SIZE;
1689 repeat = mdcount;
1690 kdbgetintenv("NOSECT", &nosect);
1691 }
1692
1693
1694
1695 addr &= ~(bytesperword-1);
1696
1697 while (repeat > 0) {
1698 unsigned long a;
1699 int n, z, num = (symbolic ? 1 : (16 / bytesperword));
1700
1701 if (KDB_FLAG(CMD_INTERRUPT))
1702 return 0;
1703 for (a = addr, z = 0; z < repeat; a += bytesperword, ++z) {
1704 if (phys) {
1705 if (kdb_getphysword(&word, a, bytesperword)
1706 || word)
1707 break;
1708 } else if (kdb_getword(&word, a, bytesperword) || word)
1709 break;
1710 }
1711 n = min(num, repeat);
1712 kdb_md_line(fmtstr, addr, symbolic, nosect, bytesperword,
1713 num, repeat, phys);
1714 addr += bytesperword * n;
1715 repeat -= n;
1716 z = (z + num - 1) / num;
1717 if (z > 2) {
1718 int s = num * (z-2);
1719 kdb_printf(kdb_machreg_fmt0 "-" kdb_machreg_fmt0
1720 " zero suppressed\n",
1721 addr, addr + bytesperword * s - 1);
1722 addr += bytesperword * s;
1723 repeat -= s;
1724 }
1725 }
1726 last_addr = addr;
1727
1728 return 0;
1729}
1730
1731
1732
1733
1734
1735
1736
1737static int kdb_mm(int argc, const char **argv)
1738{
1739 int diag;
1740 unsigned long addr;
1741 long offset = 0;
1742 unsigned long contents;
1743 int nextarg;
1744 int width;
1745
1746 if (argv[0][2] && !isdigit(argv[0][2]))
1747 return KDB_NOTFOUND;
1748
1749 if (argc < 2)
1750 return KDB_ARGCOUNT;
1751
1752 nextarg = 1;
1753 diag = kdbgetaddrarg(argc, argv, &nextarg, &addr, &offset, NULL);
1754 if (diag)
1755 return diag;
1756
1757 if (nextarg > argc)
1758 return KDB_ARGCOUNT;
1759 diag = kdbgetaddrarg(argc, argv, &nextarg, &contents, NULL, NULL);
1760 if (diag)
1761 return diag;
1762
1763 if (nextarg != argc + 1)
1764 return KDB_ARGCOUNT;
1765
1766 width = argv[0][2] ? (argv[0][2] - '0') : (KDB_WORD_SIZE);
1767 diag = kdb_putword(addr, contents, width);
1768 if (diag)
1769 return diag;
1770
1771 kdb_printf(kdb_machreg_fmt " = " kdb_machreg_fmt "\n", addr, contents);
1772
1773 return 0;
1774}
1775
1776
1777
1778
1779
1780static int kdb_go(int argc, const char **argv)
1781{
1782 unsigned long addr;
1783 int diag;
1784 int nextarg;
1785 long offset;
1786
1787 if (raw_smp_processor_id() != kdb_initial_cpu) {
1788 kdb_printf("go must execute on the entry cpu, "
1789 "please use \"cpu %d\" and then execute go\n",
1790 kdb_initial_cpu);
1791 return KDB_BADCPUNUM;
1792 }
1793 if (argc == 1) {
1794 nextarg = 1;
1795 diag = kdbgetaddrarg(argc, argv, &nextarg,
1796 &addr, &offset, NULL);
1797 if (diag)
1798 return diag;
1799 } else if (argc) {
1800 return KDB_ARGCOUNT;
1801 }
1802
1803 diag = KDB_CMD_GO;
1804 if (KDB_FLAG(CATASTROPHIC)) {
1805 kdb_printf("Catastrophic error detected\n");
1806 kdb_printf("kdb_continue_catastrophic=%d, ",
1807 kdb_continue_catastrophic);
1808 if (kdb_continue_catastrophic == 0 && kdb_go_count++ == 0) {
1809 kdb_printf("type go a second time if you really want "
1810 "to continue\n");
1811 return 0;
1812 }
1813 if (kdb_continue_catastrophic == 2) {
1814 kdb_printf("forcing reboot\n");
1815 kdb_reboot(0, NULL);
1816 }
1817 kdb_printf("attempting to continue\n");
1818 }
1819 return diag;
1820}
1821
1822
1823
1824
1825static int kdb_rd(int argc, const char **argv)
1826{
1827 int len = kdb_check_regs();
1828#if DBG_MAX_REG_NUM > 0
1829 int i;
1830 char *rname;
1831 int rsize;
1832 u64 reg64;
1833 u32 reg32;
1834 u16 reg16;
1835 u8 reg8;
1836
1837 if (len)
1838 return len;
1839
1840 for (i = 0; i < DBG_MAX_REG_NUM; i++) {
1841 rsize = dbg_reg_def[i].size * 2;
1842 if (rsize > 16)
1843 rsize = 2;
1844 if (len + strlen(dbg_reg_def[i].name) + 4 + rsize > 80) {
1845 len = 0;
1846 kdb_printf("\n");
1847 }
1848 if (len)
1849 len += kdb_printf(" ");
1850 switch(dbg_reg_def[i].size * 8) {
1851 case 8:
1852 rname = dbg_get_reg(i, ®8, kdb_current_regs);
1853 if (!rname)
1854 break;
1855 len += kdb_printf("%s: %02x", rname, reg8);
1856 break;
1857 case 16:
1858 rname = dbg_get_reg(i, ®16, kdb_current_regs);
1859 if (!rname)
1860 break;
1861 len += kdb_printf("%s: %04x", rname, reg16);
1862 break;
1863 case 32:
1864 rname = dbg_get_reg(i, ®32, kdb_current_regs);
1865 if (!rname)
1866 break;
1867 len += kdb_printf("%s: %08x", rname, reg32);
1868 break;
1869 case 64:
1870 rname = dbg_get_reg(i, ®64, kdb_current_regs);
1871 if (!rname)
1872 break;
1873 len += kdb_printf("%s: %016llx", rname, reg64);
1874 break;
1875 default:
1876 len += kdb_printf("%s: ??", dbg_reg_def[i].name);
1877 }
1878 }
1879 kdb_printf("\n");
1880#else
1881 if (len)
1882 return len;
1883
1884 kdb_dumpregs(kdb_current_regs);
1885#endif
1886 return 0;
1887}
1888
1889
1890
1891
1892
1893
1894
1895static int kdb_rm(int argc, const char **argv)
1896{
1897#if DBG_MAX_REG_NUM > 0
1898 int diag;
1899 const char *rname;
1900 int i;
1901 u64 reg64;
1902 u32 reg32;
1903 u16 reg16;
1904 u8 reg8;
1905
1906 if (argc != 2)
1907 return KDB_ARGCOUNT;
1908
1909
1910
1911 rname = argv[1];
1912 if (*rname == '%')
1913 rname++;
1914
1915 diag = kdbgetu64arg(argv[2], ®64);
1916 if (diag)
1917 return diag;
1918
1919 diag = kdb_check_regs();
1920 if (diag)
1921 return diag;
1922
1923 diag = KDB_BADREG;
1924 for (i = 0; i < DBG_MAX_REG_NUM; i++) {
1925 if (strcmp(rname, dbg_reg_def[i].name) == 0) {
1926 diag = 0;
1927 break;
1928 }
1929 }
1930 if (!diag) {
1931 switch(dbg_reg_def[i].size * 8) {
1932 case 8:
1933 reg8 = reg64;
1934 dbg_set_reg(i, ®8, kdb_current_regs);
1935 break;
1936 case 16:
1937 reg16 = reg64;
1938 dbg_set_reg(i, ®16, kdb_current_regs);
1939 break;
1940 case 32:
1941 reg32 = reg64;
1942 dbg_set_reg(i, ®32, kdb_current_regs);
1943 break;
1944 case 64:
1945 dbg_set_reg(i, ®64, kdb_current_regs);
1946 break;
1947 }
1948 }
1949 return diag;
1950#else
1951 kdb_printf("ERROR: Register set currently not implemented\n");
1952 return 0;
1953#endif
1954}
1955
1956#if defined(CONFIG_MAGIC_SYSRQ)
1957
1958
1959
1960
1961
1962static int kdb_sr(int argc, const char **argv)
1963{
1964 bool check_mask =
1965 !kdb_check_flags(KDB_ENABLE_ALL, kdb_cmd_enabled, false);
1966
1967 if (argc != 1)
1968 return KDB_ARGCOUNT;
1969
1970 kdb_trap_printk++;
1971 __handle_sysrq(*argv[1], check_mask);
1972 kdb_trap_printk--;
1973
1974 return 0;
1975}
1976#endif
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987static int kdb_ef(int argc, const char **argv)
1988{
1989 int diag;
1990 unsigned long addr;
1991 long offset;
1992 int nextarg;
1993
1994 if (argc != 1)
1995 return KDB_ARGCOUNT;
1996
1997 nextarg = 1;
1998 diag = kdbgetaddrarg(argc, argv, &nextarg, &addr, &offset, NULL);
1999 if (diag)
2000 return diag;
2001 show_regs((struct pt_regs *)addr);
2002 return 0;
2003}
2004
2005#if defined(CONFIG_MODULES)
2006
2007
2008
2009
2010
2011static int kdb_lsmod(int argc, const char **argv)
2012{
2013 struct module *mod;
2014
2015 if (argc != 0)
2016 return KDB_ARGCOUNT;
2017
2018 kdb_printf("Module Size modstruct Used by\n");
2019 list_for_each_entry(mod, kdb_modules, list) {
2020 if (mod->state == MODULE_STATE_UNFORMED)
2021 continue;
2022
2023 kdb_printf("%-20s%8u 0x%p ", mod->name,
2024 mod->core_layout.size, (void *)mod);
2025#ifdef CONFIG_MODULE_UNLOAD
2026 kdb_printf("%4d ", module_refcount(mod));
2027#endif
2028 if (mod->state == MODULE_STATE_GOING)
2029 kdb_printf(" (Unloading)");
2030 else if (mod->state == MODULE_STATE_COMING)
2031 kdb_printf(" (Loading)");
2032 else
2033 kdb_printf(" (Live)");
2034 kdb_printf(" 0x%p", mod->core_layout.base);
2035
2036#ifdef CONFIG_MODULE_UNLOAD
2037 {
2038 struct module_use *use;
2039 kdb_printf(" [ ");
2040 list_for_each_entry(use, &mod->source_list,
2041 source_list)
2042 kdb_printf("%s ", use->target->name);
2043 kdb_printf("]\n");
2044 }
2045#endif
2046 }
2047
2048 return 0;
2049}
2050
2051#endif
2052
2053
2054
2055
2056
2057
2058static int kdb_env(int argc, const char **argv)
2059{
2060 int i;
2061
2062 for (i = 0; i < __nenv; i++) {
2063 if (__env[i])
2064 kdb_printf("%s\n", __env[i]);
2065 }
2066
2067 if (KDB_DEBUG(MASK))
2068 kdb_printf("KDBFLAGS=0x%x\n", kdb_flags);
2069
2070 return 0;
2071}
2072
2073#ifdef CONFIG_PRINTK
2074
2075
2076
2077
2078
2079static int kdb_dmesg(int argc, const char **argv)
2080{
2081 int diag;
2082 int logging;
2083 int lines = 0;
2084 int adjust = 0;
2085 int n = 0;
2086 int skip = 0;
2087 struct kmsg_dumper dumper = { .active = 1 };
2088 size_t len;
2089 char buf[201];
2090
2091 if (argc > 2)
2092 return KDB_ARGCOUNT;
2093 if (argc) {
2094 char *cp;
2095 lines = simple_strtol(argv[1], &cp, 0);
2096 if (*cp)
2097 lines = 0;
2098 if (argc > 1) {
2099 adjust = simple_strtoul(argv[2], &cp, 0);
2100 if (*cp || adjust < 0)
2101 adjust = 0;
2102 }
2103 }
2104
2105
2106 diag = kdbgetintenv("LOGGING", &logging);
2107 if (!diag && logging) {
2108 const char *setargs[] = { "set", "LOGGING", "0" };
2109 kdb_set(2, setargs);
2110 }
2111
2112 kmsg_dump_rewind_nolock(&dumper);
2113 while (kmsg_dump_get_line_nolock(&dumper, 1, NULL, 0, NULL))
2114 n++;
2115
2116 if (lines < 0) {
2117 if (adjust >= n)
2118 kdb_printf("buffer only contains %d lines, nothing "
2119 "printed\n", n);
2120 else if (adjust - lines >= n)
2121 kdb_printf("buffer only contains %d lines, last %d "
2122 "lines printed\n", n, n - adjust);
2123 skip = adjust;
2124 lines = abs(lines);
2125 } else if (lines > 0) {
2126 skip = n - lines - adjust;
2127 lines = abs(lines);
2128 if (adjust >= n) {
2129 kdb_printf("buffer only contains %d lines, "
2130 "nothing printed\n", n);
2131 skip = n;
2132 } else if (skip < 0) {
2133 lines += skip;
2134 skip = 0;
2135 kdb_printf("buffer only contains %d lines, first "
2136 "%d lines printed\n", n, lines);
2137 }
2138 } else {
2139 lines = n;
2140 }
2141
2142 if (skip >= n || skip < 0)
2143 return 0;
2144
2145 kmsg_dump_rewind_nolock(&dumper);
2146 while (kmsg_dump_get_line_nolock(&dumper, 1, buf, sizeof(buf), &len)) {
2147 if (skip) {
2148 skip--;
2149 continue;
2150 }
2151 if (!lines--)
2152 break;
2153 if (KDB_FLAG(CMD_INTERRUPT))
2154 return 0;
2155
2156 kdb_printf("%.*s\n", (int)len - 1, buf);
2157 }
2158
2159 return 0;
2160}
2161#endif
2162
2163
2164static atomic_t kdb_nmi_disabled;
2165
2166static int kdb_disable_nmi(int argc, const char *argv[])
2167{
2168 if (atomic_read(&kdb_nmi_disabled))
2169 return 0;
2170 atomic_set(&kdb_nmi_disabled, 1);
2171 arch_kgdb_ops.enable_nmi(0);
2172 return 0;
2173}
2174
2175static int kdb_param_enable_nmi(const char *val, const struct kernel_param *kp)
2176{
2177 if (!atomic_add_unless(&kdb_nmi_disabled, -1, 0))
2178 return -EINVAL;
2179 arch_kgdb_ops.enable_nmi(1);
2180 return 0;
2181}
2182
2183static const struct kernel_param_ops kdb_param_ops_enable_nmi = {
2184 .set = kdb_param_enable_nmi,
2185};
2186module_param_cb(enable_nmi, &kdb_param_ops_enable_nmi, NULL, 0600);
2187
2188
2189
2190
2191
2192
2193
2194static void kdb_cpu_status(void)
2195{
2196 int i, start_cpu, first_print = 1;
2197 char state, prev_state = '?';
2198
2199 kdb_printf("Currently on cpu %d\n", raw_smp_processor_id());
2200 kdb_printf("Available cpus: ");
2201 for (start_cpu = -1, i = 0; i < NR_CPUS; i++) {
2202 if (!cpu_online(i)) {
2203 state = 'F';
2204 } else if (!kgdb_info[i].enter_kgdb) {
2205 state = 'D';
2206 } else {
2207 state = ' ';
2208 if (kdb_task_state_char(KDB_TSK(i)) == 'I')
2209 state = 'I';
2210 }
2211 if (state != prev_state) {
2212 if (prev_state != '?') {
2213 if (!first_print)
2214 kdb_printf(", ");
2215 first_print = 0;
2216 kdb_printf("%d", start_cpu);
2217 if (start_cpu < i-1)
2218 kdb_printf("-%d", i-1);
2219 if (prev_state != ' ')
2220 kdb_printf("(%c)", prev_state);
2221 }
2222 prev_state = state;
2223 start_cpu = i;
2224 }
2225 }
2226
2227 if (prev_state != 'F') {
2228 if (!first_print)
2229 kdb_printf(", ");
2230 kdb_printf("%d", start_cpu);
2231 if (start_cpu < i-1)
2232 kdb_printf("-%d", i-1);
2233 if (prev_state != ' ')
2234 kdb_printf("(%c)", prev_state);
2235 }
2236 kdb_printf("\n");
2237}
2238
2239static int kdb_cpu(int argc, const char **argv)
2240{
2241 unsigned long cpunum;
2242 int diag;
2243
2244 if (argc == 0) {
2245 kdb_cpu_status();
2246 return 0;
2247 }
2248
2249 if (argc != 1)
2250 return KDB_ARGCOUNT;
2251
2252 diag = kdbgetularg(argv[1], &cpunum);
2253 if (diag)
2254 return diag;
2255
2256
2257
2258
2259 if ((cpunum >= CONFIG_NR_CPUS) || !kgdb_info[cpunum].enter_kgdb)
2260 return KDB_BADCPUNUM;
2261
2262 dbg_switch_cpu = cpunum;
2263
2264
2265
2266
2267 return KDB_CMD_CPU;
2268}
2269
2270
2271
2272
2273void kdb_ps_suppressed(void)
2274{
2275 int idle = 0, daemon = 0;
2276 unsigned long mask_I = kdb_task_state_string("I"),
2277 mask_M = kdb_task_state_string("M");
2278 unsigned long cpu;
2279 const struct task_struct *p, *g;
2280 for_each_online_cpu(cpu) {
2281 p = kdb_curr_task(cpu);
2282 if (kdb_task_state(p, mask_I))
2283 ++idle;
2284 }
2285 kdb_do_each_thread(g, p) {
2286 if (kdb_task_state(p, mask_M))
2287 ++daemon;
2288 } kdb_while_each_thread(g, p);
2289 if (idle || daemon) {
2290 if (idle)
2291 kdb_printf("%d idle process%s (state I)%s\n",
2292 idle, idle == 1 ? "" : "es",
2293 daemon ? " and " : "");
2294 if (daemon)
2295 kdb_printf("%d sleeping system daemon (state M) "
2296 "process%s", daemon,
2297 daemon == 1 ? "" : "es");
2298 kdb_printf(" suppressed,\nuse 'ps A' to see all.\n");
2299 }
2300}
2301
2302
2303
2304
2305
2306
2307void kdb_ps1(const struct task_struct *p)
2308{
2309 int cpu;
2310 unsigned long tmp;
2311
2312 if (!p || probe_kernel_read(&tmp, (char *)p, sizeof(unsigned long)))
2313 return;
2314
2315 cpu = kdb_process_cpu(p);
2316 kdb_printf("0x%p %8d %8d %d %4d %c 0x%p %c%s\n",
2317 (void *)p, p->pid, p->parent->pid,
2318 kdb_task_has_cpu(p), kdb_process_cpu(p),
2319 kdb_task_state_char(p),
2320 (void *)(&p->thread),
2321 p == kdb_curr_task(raw_smp_processor_id()) ? '*' : ' ',
2322 p->comm);
2323 if (kdb_task_has_cpu(p)) {
2324 if (!KDB_TSK(cpu)) {
2325 kdb_printf(" Error: no saved data for this cpu\n");
2326 } else {
2327 if (KDB_TSK(cpu) != p)
2328 kdb_printf(" Error: does not match running "
2329 "process table (0x%p)\n", KDB_TSK(cpu));
2330 }
2331 }
2332}
2333
2334static int kdb_ps(int argc, const char **argv)
2335{
2336 struct task_struct *g, *p;
2337 unsigned long mask, cpu;
2338
2339 if (argc == 0)
2340 kdb_ps_suppressed();
2341 kdb_printf("%-*s Pid Parent [*] cpu State %-*s Command\n",
2342 (int)(2*sizeof(void *))+2, "Task Addr",
2343 (int)(2*sizeof(void *))+2, "Thread");
2344 mask = kdb_task_state_string(argc ? argv[1] : NULL);
2345
2346 for_each_online_cpu(cpu) {
2347 if (KDB_FLAG(CMD_INTERRUPT))
2348 return 0;
2349 p = kdb_curr_task(cpu);
2350 if (kdb_task_state(p, mask))
2351 kdb_ps1(p);
2352 }
2353 kdb_printf("\n");
2354
2355 kdb_do_each_thread(g, p) {
2356 if (KDB_FLAG(CMD_INTERRUPT))
2357 return 0;
2358 if (kdb_task_state(p, mask))
2359 kdb_ps1(p);
2360 } kdb_while_each_thread(g, p);
2361
2362 return 0;
2363}
2364
2365
2366
2367
2368
2369
2370static int kdb_pid(int argc, const char **argv)
2371{
2372 struct task_struct *p;
2373 unsigned long val;
2374 int diag;
2375
2376 if (argc > 1)
2377 return KDB_ARGCOUNT;
2378
2379 if (argc) {
2380 if (strcmp(argv[1], "R") == 0) {
2381 p = KDB_TSK(kdb_initial_cpu);
2382 } else {
2383 diag = kdbgetularg(argv[1], &val);
2384 if (diag)
2385 return KDB_BADINT;
2386
2387 p = find_task_by_pid_ns((pid_t)val, &init_pid_ns);
2388 if (!p) {
2389 kdb_printf("No task with pid=%d\n", (pid_t)val);
2390 return 0;
2391 }
2392 }
2393 kdb_set_current_task(p);
2394 }
2395 kdb_printf("KDB current process is %s(pid=%d)\n",
2396 kdb_current_task->comm,
2397 kdb_current_task->pid);
2398
2399 return 0;
2400}
2401
2402static int kdb_kgdb(int argc, const char **argv)
2403{
2404 return KDB_CMD_KGDB;
2405}
2406
2407
2408
2409
2410static int kdb_help(int argc, const char **argv)
2411{
2412 kdbtab_t *kt;
2413 int i;
2414
2415 kdb_printf("%-15.15s %-20.20s %s\n", "Command", "Usage", "Description");
2416 kdb_printf("-----------------------------"
2417 "-----------------------------\n");
2418 for_each_kdbcmd(kt, i) {
2419 char *space = "";
2420 if (KDB_FLAG(CMD_INTERRUPT))
2421 return 0;
2422 if (!kt->cmd_name)
2423 continue;
2424 if (!kdb_check_flags(kt->cmd_flags, kdb_cmd_enabled, true))
2425 continue;
2426 if (strlen(kt->cmd_usage) > 20)
2427 space = "\n ";
2428 kdb_printf("%-15.15s %-20s%s%s\n", kt->cmd_name,
2429 kt->cmd_usage, space, kt->cmd_help);
2430 }
2431 return 0;
2432}
2433
2434
2435
2436
2437static int kdb_kill(int argc, const char **argv)
2438{
2439 long sig, pid;
2440 char *endp;
2441 struct task_struct *p;
2442 struct siginfo info;
2443
2444 if (argc != 2)
2445 return KDB_ARGCOUNT;
2446
2447 sig = simple_strtol(argv[1], &endp, 0);
2448 if (*endp)
2449 return KDB_BADINT;
2450 if (sig >= 0) {
2451 kdb_printf("Invalid signal parameter.<-signal>\n");
2452 return 0;
2453 }
2454 sig = -sig;
2455
2456 pid = simple_strtol(argv[2], &endp, 0);
2457 if (*endp)
2458 return KDB_BADINT;
2459 if (pid <= 0) {
2460 kdb_printf("Process ID must be large than 0.\n");
2461 return 0;
2462 }
2463
2464
2465 p = find_task_by_pid_ns(pid, &init_pid_ns);
2466 if (!p) {
2467 kdb_printf("The specified process isn't found.\n");
2468 return 0;
2469 }
2470 p = p->group_leader;
2471 info.si_signo = sig;
2472 info.si_errno = 0;
2473 info.si_code = SI_USER;
2474 info.si_pid = pid;
2475 info.si_uid = 0;
2476 kdb_send_sig_info(p, &info);
2477 return 0;
2478}
2479
2480struct kdb_tm {
2481 int tm_sec;
2482 int tm_min;
2483 int tm_hour;
2484 int tm_mday;
2485 int tm_mon;
2486 int tm_year;
2487};
2488
2489static void kdb_gmtime(struct timespec *tv, struct kdb_tm *tm)
2490{
2491
2492 static int mon_day[] = { 31, 29, 31, 30, 31, 30, 31,
2493 31, 30, 31, 30, 31 };
2494 memset(tm, 0, sizeof(*tm));
2495 tm->tm_sec = tv->tv_sec % (24 * 60 * 60);
2496 tm->tm_mday = tv->tv_sec / (24 * 60 * 60) +
2497 (2 * 365 + 1);
2498 tm->tm_min = tm->tm_sec / 60 % 60;
2499 tm->tm_hour = tm->tm_sec / 60 / 60;
2500 tm->tm_sec = tm->tm_sec % 60;
2501 tm->tm_year = 68 + 4*(tm->tm_mday / (4*365+1));
2502 tm->tm_mday %= (4*365+1);
2503 mon_day[1] = 29;
2504 while (tm->tm_mday >= mon_day[tm->tm_mon]) {
2505 tm->tm_mday -= mon_day[tm->tm_mon];
2506 if (++tm->tm_mon == 12) {
2507 tm->tm_mon = 0;
2508 ++tm->tm_year;
2509 mon_day[1] = 28;
2510 }
2511 }
2512 ++tm->tm_mday;
2513}
2514
2515
2516
2517
2518
2519
2520static void kdb_sysinfo(struct sysinfo *val)
2521{
2522 struct timespec uptime;
2523 ktime_get_ts(&uptime);
2524 memset(val, 0, sizeof(*val));
2525 val->uptime = uptime.tv_sec;
2526 val->loads[0] = avenrun[0];
2527 val->loads[1] = avenrun[1];
2528 val->loads[2] = avenrun[2];
2529 val->procs = nr_threads-1;
2530 si_meminfo(val);
2531
2532 return;
2533}
2534
2535
2536
2537
2538static int kdb_summary(int argc, const char **argv)
2539{
2540 struct timespec now;
2541 struct kdb_tm tm;
2542 struct sysinfo val;
2543
2544 if (argc)
2545 return KDB_ARGCOUNT;
2546
2547 kdb_printf("sysname %s\n", init_uts_ns.name.sysname);
2548 kdb_printf("release %s\n", init_uts_ns.name.release);
2549 kdb_printf("version %s\n", init_uts_ns.name.version);
2550 kdb_printf("machine %s\n", init_uts_ns.name.machine);
2551 kdb_printf("nodename %s\n", init_uts_ns.name.nodename);
2552 kdb_printf("domainname %s\n", init_uts_ns.name.domainname);
2553 kdb_printf("ccversion %s\n", __stringify(CCVERSION));
2554
2555 now = __current_kernel_time();
2556 kdb_gmtime(&now, &tm);
2557 kdb_printf("date %04d-%02d-%02d %02d:%02d:%02d "
2558 "tz_minuteswest %d\n",
2559 1900+tm.tm_year, tm.tm_mon+1, tm.tm_mday,
2560 tm.tm_hour, tm.tm_min, tm.tm_sec,
2561 sys_tz.tz_minuteswest);
2562
2563 kdb_sysinfo(&val);
2564 kdb_printf("uptime ");
2565 if (val.uptime > (24*60*60)) {
2566 int days = val.uptime / (24*60*60);
2567 val.uptime %= (24*60*60);
2568 kdb_printf("%d day%s ", days, days == 1 ? "" : "s");
2569 }
2570 kdb_printf("%02ld:%02ld\n", val.uptime/(60*60), (val.uptime/60)%60);
2571
2572
2573
2574#define LOAD_INT(x) ((x) >> FSHIFT)
2575#define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1-1)) * 100)
2576 kdb_printf("load avg %ld.%02ld %ld.%02ld %ld.%02ld\n",
2577 LOAD_INT(val.loads[0]), LOAD_FRAC(val.loads[0]),
2578 LOAD_INT(val.loads[1]), LOAD_FRAC(val.loads[1]),
2579 LOAD_INT(val.loads[2]), LOAD_FRAC(val.loads[2]));
2580#undef LOAD_INT
2581#undef LOAD_FRAC
2582
2583#define K(x) ((x) << (PAGE_SHIFT - 10))
2584 kdb_printf("\nMemTotal: %8lu kB\nMemFree: %8lu kB\n"
2585 "Buffers: %8lu kB\n",
2586 K(val.totalram), K(val.freeram), K(val.bufferram));
2587 return 0;
2588}
2589
2590
2591
2592
2593static int kdb_per_cpu(int argc, const char **argv)
2594{
2595 char fmtstr[64];
2596 int cpu, diag, nextarg = 1;
2597 unsigned long addr, symaddr, val, bytesperword = 0, whichcpu = ~0UL;
2598
2599 if (argc < 1 || argc > 3)
2600 return KDB_ARGCOUNT;
2601
2602 diag = kdbgetaddrarg(argc, argv, &nextarg, &symaddr, NULL, NULL);
2603 if (diag)
2604 return diag;
2605
2606 if (argc >= 2) {
2607 diag = kdbgetularg(argv[2], &bytesperword);
2608 if (diag)
2609 return diag;
2610 }
2611 if (!bytesperword)
2612 bytesperword = KDB_WORD_SIZE;
2613 else if (bytesperword > KDB_WORD_SIZE)
2614 return KDB_BADWIDTH;
2615 sprintf(fmtstr, "%%0%dlx ", (int)(2*bytesperword));
2616 if (argc >= 3) {
2617 diag = kdbgetularg(argv[3], &whichcpu);
2618 if (diag)
2619 return diag;
2620 if (!cpu_online(whichcpu)) {
2621 kdb_printf("cpu %ld is not online\n", whichcpu);
2622 return KDB_BADCPUNUM;
2623 }
2624 }
2625
2626
2627
2628
2629#ifdef __per_cpu_offset
2630#define KDB_PCU(cpu) __per_cpu_offset(cpu)
2631#else
2632#ifdef CONFIG_SMP
2633#define KDB_PCU(cpu) __per_cpu_offset[cpu]
2634#else
2635#define KDB_PCU(cpu) 0
2636#endif
2637#endif
2638 for_each_online_cpu(cpu) {
2639 if (KDB_FLAG(CMD_INTERRUPT))
2640 return 0;
2641
2642 if (whichcpu != ~0UL && whichcpu != cpu)
2643 continue;
2644 addr = symaddr + KDB_PCU(cpu);
2645 diag = kdb_getword(&val, addr, bytesperword);
2646 if (diag) {
2647 kdb_printf("%5d " kdb_bfd_vma_fmt0 " - unable to "
2648 "read, diag=%d\n", cpu, addr, diag);
2649 continue;
2650 }
2651 kdb_printf("%5d ", cpu);
2652 kdb_md_line(fmtstr, addr,
2653 bytesperword == KDB_WORD_SIZE,
2654 1, bytesperword, 1, 1, 0);
2655 }
2656#undef KDB_PCU
2657 return 0;
2658}
2659
2660
2661
2662
2663static int kdb_grep_help(int argc, const char **argv)
2664{
2665 kdb_printf("Usage of cmd args | grep pattern:\n");
2666 kdb_printf(" Any command's output may be filtered through an ");
2667 kdb_printf("emulated 'pipe'.\n");
2668 kdb_printf(" 'grep' is just a key word.\n");
2669 kdb_printf(" The pattern may include a very limited set of "
2670 "metacharacters:\n");
2671 kdb_printf(" pattern or ^pattern or pattern$ or ^pattern$\n");
2672 kdb_printf(" And if there are spaces in the pattern, you may "
2673 "quote it:\n");
2674 kdb_printf(" \"pat tern\" or \"^pat tern\" or \"pat tern$\""
2675 " or \"^pat tern$\"\n");
2676 return 0;
2677}
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691#define kdb_command_extend 50
2692int kdb_register_flags(char *cmd,
2693 kdb_func_t func,
2694 char *usage,
2695 char *help,
2696 short minlen,
2697 kdb_cmdflags_t flags)
2698{
2699 int i;
2700 kdbtab_t *kp;
2701
2702
2703
2704
2705 for_each_kdbcmd(kp, i) {
2706 if (kp->cmd_name && (strcmp(kp->cmd_name, cmd) == 0)) {
2707 kdb_printf("Duplicate kdb command registered: "
2708 "%s, func %p help %s\n", cmd, func, help);
2709 return 1;
2710 }
2711 }
2712
2713
2714
2715
2716 for_each_kdbcmd(kp, i) {
2717 if (kp->cmd_name == NULL)
2718 break;
2719 }
2720
2721 if (i >= kdb_max_commands) {
2722 kdbtab_t *new = kmalloc((kdb_max_commands - KDB_BASE_CMD_MAX +
2723 kdb_command_extend) * sizeof(*new), GFP_KDB);
2724 if (!new) {
2725 kdb_printf("Could not allocate new kdb_command "
2726 "table\n");
2727 return 1;
2728 }
2729 if (kdb_commands) {
2730 memcpy(new, kdb_commands,
2731 (kdb_max_commands - KDB_BASE_CMD_MAX) * sizeof(*new));
2732 kfree(kdb_commands);
2733 }
2734 memset(new + kdb_max_commands - KDB_BASE_CMD_MAX, 0,
2735 kdb_command_extend * sizeof(*new));
2736 kdb_commands = new;
2737 kp = kdb_commands + kdb_max_commands - KDB_BASE_CMD_MAX;
2738 kdb_max_commands += kdb_command_extend;
2739 }
2740
2741 kp->cmd_name = cmd;
2742 kp->cmd_func = func;
2743 kp->cmd_usage = usage;
2744 kp->cmd_help = help;
2745 kp->cmd_minlen = minlen;
2746 kp->cmd_flags = flags;
2747
2748 return 0;
2749}
2750EXPORT_SYMBOL_GPL(kdb_register_flags);
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765int kdb_register(char *cmd,
2766 kdb_func_t func,
2767 char *usage,
2768 char *help,
2769 short minlen)
2770{
2771 return kdb_register_flags(cmd, func, usage, help, minlen, 0);
2772}
2773EXPORT_SYMBOL_GPL(kdb_register);
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784int kdb_unregister(char *cmd)
2785{
2786 int i;
2787 kdbtab_t *kp;
2788
2789
2790
2791
2792 for_each_kdbcmd(kp, i) {
2793 if (kp->cmd_name && (strcmp(kp->cmd_name, cmd) == 0)) {
2794 kp->cmd_name = NULL;
2795 return 0;
2796 }
2797 }
2798
2799
2800 return 1;
2801}
2802EXPORT_SYMBOL_GPL(kdb_unregister);
2803
2804
2805static void __init kdb_inittab(void)
2806{
2807 int i;
2808 kdbtab_t *kp;
2809
2810 for_each_kdbcmd(kp, i)
2811 kp->cmd_name = NULL;
2812
2813 kdb_register_flags("md", kdb_md, "<vaddr>",
2814 "Display Memory Contents, also mdWcN, e.g. md8c1", 1,
2815 KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS);
2816 kdb_register_flags("mdr", kdb_md, "<vaddr> <bytes>",
2817 "Display Raw Memory", 0,
2818 KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS);
2819 kdb_register_flags("mdp", kdb_md, "<paddr> <bytes>",
2820 "Display Physical Memory", 0,
2821 KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS);
2822 kdb_register_flags("mds", kdb_md, "<vaddr>",
2823 "Display Memory Symbolically", 0,
2824 KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS);
2825 kdb_register_flags("mm", kdb_mm, "<vaddr> <contents>",
2826 "Modify Memory Contents", 0,
2827 KDB_ENABLE_MEM_WRITE | KDB_REPEAT_NO_ARGS);
2828 kdb_register_flags("go", kdb_go, "[<vaddr>]",
2829 "Continue Execution", 1,
2830 KDB_ENABLE_REG_WRITE | KDB_ENABLE_ALWAYS_SAFE_NO_ARGS);
2831 kdb_register_flags("rd", kdb_rd, "",
2832 "Display Registers", 0,
2833 KDB_ENABLE_REG_READ);
2834 kdb_register_flags("rm", kdb_rm, "<reg> <contents>",
2835 "Modify Registers", 0,
2836 KDB_ENABLE_REG_WRITE);
2837 kdb_register_flags("ef", kdb_ef, "<vaddr>",
2838 "Display exception frame", 0,
2839 KDB_ENABLE_MEM_READ);
2840 kdb_register_flags("bt", kdb_bt, "[<vaddr>]",
2841 "Stack traceback", 1,
2842 KDB_ENABLE_MEM_READ | KDB_ENABLE_INSPECT_NO_ARGS);
2843 kdb_register_flags("btp", kdb_bt, "<pid>",
2844 "Display stack for process <pid>", 0,
2845 KDB_ENABLE_INSPECT);
2846 kdb_register_flags("bta", kdb_bt, "[D|R|S|T|C|Z|E|U|I|M|A]",
2847 "Backtrace all processes matching state flag", 0,
2848 KDB_ENABLE_INSPECT);
2849 kdb_register_flags("btc", kdb_bt, "",
2850 "Backtrace current process on each cpu", 0,
2851 KDB_ENABLE_INSPECT);
2852 kdb_register_flags("btt", kdb_bt, "<vaddr>",
2853 "Backtrace process given its struct task address", 0,
2854 KDB_ENABLE_MEM_READ | KDB_ENABLE_INSPECT_NO_ARGS);
2855 kdb_register_flags("env", kdb_env, "",
2856 "Show environment variables", 0,
2857 KDB_ENABLE_ALWAYS_SAFE);
2858 kdb_register_flags("set", kdb_set, "",
2859 "Set environment variables", 0,
2860 KDB_ENABLE_ALWAYS_SAFE);
2861 kdb_register_flags("help", kdb_help, "",
2862 "Display Help Message", 1,
2863 KDB_ENABLE_ALWAYS_SAFE);
2864 kdb_register_flags("?", kdb_help, "",
2865 "Display Help Message", 0,
2866 KDB_ENABLE_ALWAYS_SAFE);
2867 kdb_register_flags("cpu", kdb_cpu, "<cpunum>",
2868 "Switch to new cpu", 0,
2869 KDB_ENABLE_ALWAYS_SAFE_NO_ARGS);
2870 kdb_register_flags("kgdb", kdb_kgdb, "",
2871 "Enter kgdb mode", 0, 0);
2872 kdb_register_flags("ps", kdb_ps, "[<flags>|A]",
2873 "Display active task list", 0,
2874 KDB_ENABLE_INSPECT);
2875 kdb_register_flags("pid", kdb_pid, "<pidnum>",
2876 "Switch to another task", 0,
2877 KDB_ENABLE_INSPECT);
2878 kdb_register_flags("reboot", kdb_reboot, "",
2879 "Reboot the machine immediately", 0,
2880 KDB_ENABLE_REBOOT);
2881#if defined(CONFIG_MODULES)
2882 kdb_register_flags("lsmod", kdb_lsmod, "",
2883 "List loaded kernel modules", 0,
2884 KDB_ENABLE_INSPECT);
2885#endif
2886#if defined(CONFIG_MAGIC_SYSRQ)
2887 kdb_register_flags("sr", kdb_sr, "<key>",
2888 "Magic SysRq key", 0,
2889 KDB_ENABLE_ALWAYS_SAFE);
2890#endif
2891#if defined(CONFIG_PRINTK)
2892 kdb_register_flags("dmesg", kdb_dmesg, "[lines]",
2893 "Display syslog buffer", 0,
2894 KDB_ENABLE_ALWAYS_SAFE);
2895#endif
2896 if (arch_kgdb_ops.enable_nmi) {
2897 kdb_register_flags("disable_nmi", kdb_disable_nmi, "",
2898 "Disable NMI entry to KDB", 0,
2899 KDB_ENABLE_ALWAYS_SAFE);
2900 }
2901 kdb_register_flags("defcmd", kdb_defcmd, "name \"usage\" \"help\"",
2902 "Define a set of commands, down to endefcmd", 0,
2903 KDB_ENABLE_ALWAYS_SAFE);
2904 kdb_register_flags("kill", kdb_kill, "<-signal> <pid>",
2905 "Send a signal to a process", 0,
2906 KDB_ENABLE_SIGNAL);
2907 kdb_register_flags("summary", kdb_summary, "",
2908 "Summarize the system", 4,
2909 KDB_ENABLE_ALWAYS_SAFE);
2910 kdb_register_flags("per_cpu", kdb_per_cpu, "<sym> [<bytes>] [<cpu>]",
2911 "Display per_cpu variables", 3,
2912 KDB_ENABLE_MEM_READ);
2913 kdb_register_flags("grephelp", kdb_grep_help, "",
2914 "Display help on | grep", 0,
2915 KDB_ENABLE_ALWAYS_SAFE);
2916}
2917
2918
2919static void __init kdb_cmd_init(void)
2920{
2921 int i, diag;
2922 for (i = 0; kdb_cmds[i]; ++i) {
2923 diag = kdb_parse(kdb_cmds[i]);
2924 if (diag)
2925 kdb_printf("kdb command %s failed, kdb diag %d\n",
2926 kdb_cmds[i], diag);
2927 }
2928 if (defcmd_in_progress) {
2929 kdb_printf("Incomplete 'defcmd' set, forcing endefcmd\n");
2930 kdb_parse("endefcmd");
2931 }
2932}
2933
2934
2935void __init kdb_init(int lvl)
2936{
2937 static int kdb_init_lvl = KDB_NOT_INITIALIZED;
2938 int i;
2939
2940 if (kdb_init_lvl == KDB_INIT_FULL || lvl <= kdb_init_lvl)
2941 return;
2942 for (i = kdb_init_lvl; i < lvl; i++) {
2943 switch (i) {
2944 case KDB_NOT_INITIALIZED:
2945 kdb_inittab();
2946 kdb_initbptab();
2947 break;
2948 case KDB_INIT_EARLY:
2949 kdb_cmd_init();
2950 break;
2951 }
2952 }
2953 kdb_init_lvl = lvl;
2954}
2955