]>
Commit | Line | Data |
---|---|---|
5d5314d6 JW |
1 | /* |
2 | * Kernel Debugger Architecture Independent Main Code | |
3 | * | |
4 | * This file is subject to the terms and conditions of the GNU General Public | |
5 | * License. See the file "COPYING" in the main directory of this archive | |
6 | * for more details. | |
7 | * | |
8 | * Copyright (C) 1999-2004 Silicon Graphics, Inc. All Rights Reserved. | |
9 | * Copyright (C) 2000 Stephane Eranian <eranian@hpl.hp.com> | |
10 | * Xscale (R) modifications copyright (C) 2003 Intel Corporation. | |
11 | * Copyright (c) 2009 Wind River Systems, Inc. All Rights Reserved. | |
12 | */ | |
13 | ||
14 | #include <linux/ctype.h> | |
15 | #include <linux/string.h> | |
16 | #include <linux/kernel.h> | |
17 | #include <linux/reboot.h> | |
18 | #include <linux/sched.h> | |
19 | #include <linux/sysrq.h> | |
20 | #include <linux/smp.h> | |
21 | #include <linux/utsname.h> | |
22 | #include <linux/vmalloc.h> | |
23 | #include <linux/module.h> | |
24 | #include <linux/mm.h> | |
25 | #include <linux/init.h> | |
26 | #include <linux/kallsyms.h> | |
27 | #include <linux/kgdb.h> | |
28 | #include <linux/kdb.h> | |
29 | #include <linux/notifier.h> | |
30 | #include <linux/interrupt.h> | |
31 | #include <linux/delay.h> | |
32 | #include <linux/nmi.h> | |
33 | #include <linux/time.h> | |
34 | #include <linux/ptrace.h> | |
35 | #include <linux/sysctl.h> | |
36 | #include <linux/cpu.h> | |
37 | #include <linux/kdebug.h> | |
38 | #include <linux/proc_fs.h> | |
39 | #include <linux/uaccess.h> | |
40 | #include <linux/slab.h> | |
41 | #include "kdb_private.h" | |
42 | ||
43 | #define GREP_LEN 256 | |
44 | char kdb_grep_string[GREP_LEN]; | |
45 | int kdb_grepping_flag; | |
46 | EXPORT_SYMBOL(kdb_grepping_flag); | |
47 | int kdb_grep_leading; | |
48 | int kdb_grep_trailing; | |
49 | ||
50 | /* | |
51 | * Kernel debugger state flags | |
52 | */ | |
53 | int kdb_flags; | |
54 | atomic_t kdb_event; | |
55 | ||
56 | /* | |
57 | * kdb_lock protects updates to kdb_initial_cpu. Used to | |
58 | * single thread processors through the kernel debugger. | |
59 | */ | |
60 | int kdb_initial_cpu = -1; /* cpu number that owns kdb */ | |
61 | int kdb_nextline = 1; | |
62 | int kdb_state; /* General KDB state */ | |
63 | ||
64 | struct task_struct *kdb_current_task; | |
65 | EXPORT_SYMBOL(kdb_current_task); | |
66 | struct pt_regs *kdb_current_regs; | |
67 | ||
68 | const char *kdb_diemsg; | |
69 | static int kdb_go_count; | |
70 | #ifdef CONFIG_KDB_CONTINUE_CATASTROPHIC | |
71 | static unsigned int kdb_continue_catastrophic = | |
72 | CONFIG_KDB_CONTINUE_CATASTROPHIC; | |
73 | #else | |
74 | static unsigned int kdb_continue_catastrophic; | |
75 | #endif | |
76 | ||
77 | /* kdb_commands describes the available commands. */ | |
78 | static kdbtab_t *kdb_commands; | |
79 | #define KDB_BASE_CMD_MAX 50 | |
80 | static int kdb_max_commands = KDB_BASE_CMD_MAX; | |
81 | static kdbtab_t kdb_base_commands[50]; | |
82 | #define for_each_kdbcmd(cmd, num) \ | |
83 | for ((cmd) = kdb_base_commands, (num) = 0; \ | |
84 | num < kdb_max_commands; \ | |
85 | num == KDB_BASE_CMD_MAX ? cmd = kdb_commands : cmd++, num++) | |
86 | ||
87 | typedef struct _kdbmsg { | |
88 | int km_diag; /* kdb diagnostic */ | |
89 | char *km_msg; /* Corresponding message text */ | |
90 | } kdbmsg_t; | |
91 | ||
92 | #define KDBMSG(msgnum, text) \ | |
93 | { KDB_##msgnum, text } | |
94 | ||
95 | static kdbmsg_t kdbmsgs[] = { | |
96 | KDBMSG(NOTFOUND, "Command Not Found"), | |
97 | KDBMSG(ARGCOUNT, "Improper argument count, see usage."), | |
98 | KDBMSG(BADWIDTH, "Illegal value for BYTESPERWORD use 1, 2, 4 or 8, " | |
99 | "8 is only allowed on 64 bit systems"), | |
100 | KDBMSG(BADRADIX, "Illegal value for RADIX use 8, 10 or 16"), | |
101 | KDBMSG(NOTENV, "Cannot find environment variable"), | |
102 | KDBMSG(NOENVVALUE, "Environment variable should have value"), | |
103 | KDBMSG(NOTIMP, "Command not implemented"), | |
104 | KDBMSG(ENVFULL, "Environment full"), | |
105 | KDBMSG(ENVBUFFULL, "Environment buffer full"), | |
106 | KDBMSG(TOOMANYBPT, "Too many breakpoints defined"), | |
107 | #ifdef CONFIG_CPU_XSCALE | |
108 | KDBMSG(TOOMANYDBREGS, "More breakpoints than ibcr registers defined"), | |
109 | #else | |
110 | KDBMSG(TOOMANYDBREGS, "More breakpoints than db registers defined"), | |
111 | #endif | |
112 | KDBMSG(DUPBPT, "Duplicate breakpoint address"), | |
113 | KDBMSG(BPTNOTFOUND, "Breakpoint not found"), | |
114 | KDBMSG(BADMODE, "Invalid IDMODE"), | |
115 | KDBMSG(BADINT, "Illegal numeric value"), | |
116 | KDBMSG(INVADDRFMT, "Invalid symbolic address format"), | |
117 | KDBMSG(BADREG, "Invalid register name"), | |
118 | KDBMSG(BADCPUNUM, "Invalid cpu number"), | |
119 | KDBMSG(BADLENGTH, "Invalid length field"), | |
120 | KDBMSG(NOBP, "No Breakpoint exists"), | |
121 | KDBMSG(BADADDR, "Invalid address"), | |
122 | }; | |
123 | #undef KDBMSG | |
124 | ||
125 | static const int __nkdb_err = sizeof(kdbmsgs) / sizeof(kdbmsg_t); | |
126 | ||
127 | ||
128 | /* | |
129 | * Initial environment. This is all kept static and local to | |
130 | * this file. We don't want to rely on the memory allocation | |
131 | * mechanisms in the kernel, so we use a very limited allocate-only | |
132 | * heap for new and altered environment variables. The entire | |
133 | * environment is limited to a fixed number of entries (add more | |
134 | * to __env[] if required) and a fixed amount of heap (add more to | |
135 | * KDB_ENVBUFSIZE if required). | |
136 | */ | |
137 | ||
138 | static char *__env[] = { | |
139 | #if defined(CONFIG_SMP) | |
140 | "PROMPT=[%d]kdb> ", | |
141 | "MOREPROMPT=[%d]more> ", | |
142 | #else | |
143 | "PROMPT=kdb> ", | |
144 | "MOREPROMPT=more> ", | |
145 | #endif | |
146 | "RADIX=16", | |
147 | "MDCOUNT=8", /* lines of md output */ | |
148 | "BTARGS=9", /* 9 possible args in bt */ | |
149 | KDB_PLATFORM_ENV, | |
150 | "DTABCOUNT=30", | |
151 | "NOSECT=1", | |
152 | (char *)0, | |
153 | (char *)0, | |
154 | (char *)0, | |
155 | (char *)0, | |
156 | (char *)0, | |
157 | (char *)0, | |
158 | (char *)0, | |
159 | (char *)0, | |
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 | }; | |
176 | ||
177 | static const int __nenv = (sizeof(__env) / sizeof(char *)); | |
178 | ||
179 | struct task_struct *kdb_curr_task(int cpu) | |
180 | { | |
181 | struct task_struct *p = curr_task(cpu); | |
182 | #ifdef _TIF_MCA_INIT | |
183 | if ((task_thread_info(p)->flags & _TIF_MCA_INIT) && KDB_TSK(cpu)) | |
184 | p = krp->p; | |
185 | #endif | |
186 | return p; | |
187 | } | |
188 | ||
189 | /* | |
190 | * kdbgetenv - This function will return the character string value of | |
191 | * an environment variable. | |
192 | * Parameters: | |
193 | * match A character string representing an environment variable. | |
194 | * Returns: | |
195 | * NULL No environment variable matches 'match' | |
196 | * char* Pointer to string value of environment variable. | |
197 | */ | |
198 | char *kdbgetenv(const char *match) | |
199 | { | |
200 | char **ep = __env; | |
201 | int matchlen = strlen(match); | |
202 | int i; | |
203 | ||
204 | for (i = 0; i < __nenv; i++) { | |
205 | char *e = *ep++; | |
206 | ||
207 | if (!e) | |
208 | continue; | |
209 | ||
210 | if ((strncmp(match, e, matchlen) == 0) | |
211 | && ((e[matchlen] == '\0') | |
212 | || (e[matchlen] == '='))) { | |
213 | char *cp = strchr(e, '='); | |
214 | return cp ? ++cp : ""; | |
215 | } | |
216 | } | |
217 | return NULL; | |
218 | } | |
219 | ||
220 | /* | |
221 | * kdballocenv - This function is used to allocate bytes for | |
222 | * environment entries. | |
223 | * Parameters: | |
224 | * match A character string representing a numeric value | |
225 | * Outputs: | |
226 | * *value the unsigned long representation of the env variable 'match' | |
227 | * Returns: | |
228 | * Zero on success, a kdb diagnostic on failure. | |
229 | * Remarks: | |
230 | * We use a static environment buffer (envbuffer) to hold the values | |
231 | * of dynamically generated environment variables (see kdb_set). Buffer | |
232 | * space once allocated is never free'd, so over time, the amount of space | |
233 | * (currently 512 bytes) will be exhausted if env variables are changed | |
234 | * frequently. | |
235 | */ | |
236 | static char *kdballocenv(size_t bytes) | |
237 | { | |
238 | #define KDB_ENVBUFSIZE 512 | |
239 | static char envbuffer[KDB_ENVBUFSIZE]; | |
240 | static int envbufsize; | |
241 | char *ep = NULL; | |
242 | ||
243 | if ((KDB_ENVBUFSIZE - envbufsize) >= bytes) { | |
244 | ep = &envbuffer[envbufsize]; | |
245 | envbufsize += bytes; | |
246 | } | |
247 | return ep; | |
248 | } | |
249 | ||
250 | /* | |
251 | * kdbgetulenv - This function will return the value of an unsigned | |
252 | * long-valued environment variable. | |
253 | * Parameters: | |
254 | * match A character string representing a numeric value | |
255 | * Outputs: | |
256 | * *value the unsigned long represntation of the env variable 'match' | |
257 | * Returns: | |
258 | * Zero on success, a kdb diagnostic on failure. | |
259 | */ | |
260 | static int kdbgetulenv(const char *match, unsigned long *value) | |
261 | { | |
262 | char *ep; | |
263 | ||
264 | ep = kdbgetenv(match); | |
265 | if (!ep) | |
266 | return KDB_NOTENV; | |
267 | if (strlen(ep) == 0) | |
268 | return KDB_NOENVVALUE; | |
269 | ||
270 | *value = simple_strtoul(ep, NULL, 0); | |
271 | ||
272 | return 0; | |
273 | } | |
274 | ||
275 | /* | |
276 | * kdbgetintenv - This function will return the value of an | |
277 | * integer-valued environment variable. | |
278 | * Parameters: | |
279 | * match A character string representing an integer-valued env variable | |
280 | * Outputs: | |
281 | * *value the integer representation of the environment variable 'match' | |
282 | * Returns: | |
283 | * Zero on success, a kdb diagnostic on failure. | |
284 | */ | |
285 | int kdbgetintenv(const char *match, int *value) | |
286 | { | |
287 | unsigned long val; | |
288 | int diag; | |
289 | ||
290 | diag = kdbgetulenv(match, &val); | |
291 | if (!diag) | |
292 | *value = (int) val; | |
293 | return diag; | |
294 | } | |
295 | ||
296 | /* | |
297 | * kdbgetularg - This function will convert a numeric string into an | |
298 | * unsigned long value. | |
299 | * Parameters: | |
300 | * arg A character string representing a numeric value | |
301 | * Outputs: | |
302 | * *value the unsigned long represntation of arg. | |
303 | * Returns: | |
304 | * Zero on success, a kdb diagnostic on failure. | |
305 | */ | |
306 | int kdbgetularg(const char *arg, unsigned long *value) | |
307 | { | |
308 | char *endp; | |
309 | unsigned long val; | |
310 | ||
311 | val = simple_strtoul(arg, &endp, 0); | |
312 | ||
313 | if (endp == arg) { | |
314 | /* | |
315 | * Try base 16, for us folks too lazy to type the | |
316 | * leading 0x... | |
317 | */ | |
318 | val = simple_strtoul(arg, &endp, 16); | |
319 | if (endp == arg) | |
320 | return KDB_BADINT; | |
321 | } | |
322 | ||
323 | *value = val; | |
324 | ||
325 | return 0; | |
326 | } | |
327 | ||
328 | /* | |
329 | * kdb_set - This function implements the 'set' command. Alter an | |
330 | * existing environment variable or create a new one. | |
331 | */ | |
332 | int kdb_set(int argc, const char **argv) | |
333 | { | |
334 | int i; | |
335 | char *ep; | |
336 | size_t varlen, vallen; | |
337 | ||
338 | /* | |
339 | * we can be invoked two ways: | |
340 | * set var=value argv[1]="var", argv[2]="value" | |
341 | * set var = value argv[1]="var", argv[2]="=", argv[3]="value" | |
342 | * - if the latter, shift 'em down. | |
343 | */ | |
344 | if (argc == 3) { | |
345 | argv[2] = argv[3]; | |
346 | argc--; | |
347 | } | |
348 | ||
349 | if (argc != 2) | |
350 | return KDB_ARGCOUNT; | |
351 | ||
352 | /* | |
353 | * Check for internal variables | |
354 | */ | |
355 | if (strcmp(argv[1], "KDBDEBUG") == 0) { | |
356 | unsigned int debugflags; | |
357 | char *cp; | |
358 | ||
359 | debugflags = simple_strtoul(argv[2], &cp, 0); | |
360 | if (cp == argv[2] || debugflags & ~KDB_DEBUG_FLAG_MASK) { | |
361 | kdb_printf("kdb: illegal debug flags '%s'\n", | |
362 | argv[2]); | |
363 | return 0; | |
364 | } | |
365 | kdb_flags = (kdb_flags & | |
366 | ~(KDB_DEBUG_FLAG_MASK << KDB_DEBUG_FLAG_SHIFT)) | |
367 | | (debugflags << KDB_DEBUG_FLAG_SHIFT); | |
368 | ||
369 | return 0; | |
370 | } | |
371 | ||
372 | /* | |
373 | * Tokenizer squashed the '=' sign. argv[1] is variable | |
374 | * name, argv[2] = value. | |
375 | */ | |
376 | varlen = strlen(argv[1]); | |
377 | vallen = strlen(argv[2]); | |
378 | ep = kdballocenv(varlen + vallen + 2); | |
379 | if (ep == (char *)0) | |
380 | return KDB_ENVBUFFULL; | |
381 | ||
382 | sprintf(ep, "%s=%s", argv[1], argv[2]); | |
383 | ||
384 | ep[varlen+vallen+1] = '\0'; | |
385 | ||
386 | for (i = 0; i < __nenv; i++) { | |
387 | if (__env[i] | |
388 | && ((strncmp(__env[i], argv[1], varlen) == 0) | |
389 | && ((__env[i][varlen] == '\0') | |
390 | || (__env[i][varlen] == '=')))) { | |
391 | __env[i] = ep; | |
392 | return 0; | |
393 | } | |
394 | } | |
395 | ||
396 | /* | |
397 | * Wasn't existing variable. Fit into slot. | |
398 | */ | |
399 | for (i = 0; i < __nenv-1; i++) { | |
400 | if (__env[i] == (char *)0) { | |
401 | __env[i] = ep; | |
402 | return 0; | |
403 | } | |
404 | } | |
405 | ||
406 | return KDB_ENVFULL; | |
407 | } | |
408 | ||
409 | static int kdb_check_regs(void) | |
410 | { | |
411 | if (!kdb_current_regs) { | |
412 | kdb_printf("No current kdb registers." | |
413 | " You may need to select another task\n"); | |
414 | return KDB_BADREG; | |
415 | } | |
416 | return 0; | |
417 | } | |
418 | ||
419 | /* | |
420 | * kdbgetaddrarg - This function is responsible for parsing an | |
421 | * address-expression and returning the value of the expression, | |
422 | * symbol name, and offset to the caller. | |
423 | * | |
424 | * The argument may consist of a numeric value (decimal or | |
425 | * hexidecimal), a symbol name, a register name (preceeded by the | |
426 | * percent sign), an environment variable with a numeric value | |
427 | * (preceeded by a dollar sign) or a simple arithmetic expression | |
428 | * consisting of a symbol name, +/-, and a numeric constant value | |
429 | * (offset). | |
430 | * Parameters: | |
431 | * argc - count of arguments in argv | |
432 | * argv - argument vector | |
433 | * *nextarg - index to next unparsed argument in argv[] | |
434 | * regs - Register state at time of KDB entry | |
435 | * Outputs: | |
436 | * *value - receives the value of the address-expression | |
437 | * *offset - receives the offset specified, if any | |
438 | * *name - receives the symbol name, if any | |
439 | * *nextarg - index to next unparsed argument in argv[] | |
440 | * Returns: | |
441 | * zero is returned on success, a kdb diagnostic code is | |
442 | * returned on error. | |
443 | */ | |
444 | int kdbgetaddrarg(int argc, const char **argv, int *nextarg, | |
445 | unsigned long *value, long *offset, | |
446 | char **name) | |
447 | { | |
448 | unsigned long addr; | |
449 | unsigned long off = 0; | |
450 | int positive; | |
451 | int diag; | |
452 | int found = 0; | |
453 | char *symname; | |
454 | char symbol = '\0'; | |
455 | char *cp; | |
456 | kdb_symtab_t symtab; | |
457 | ||
458 | /* | |
459 | * Process arguments which follow the following syntax: | |
460 | * | |
461 | * symbol | numeric-address [+/- numeric-offset] | |
462 | * %register | |
463 | * $environment-variable | |
464 | */ | |
465 | ||
466 | if (*nextarg > argc) | |
467 | return KDB_ARGCOUNT; | |
468 | ||
469 | symname = (char *)argv[*nextarg]; | |
470 | ||
471 | /* | |
472 | * If there is no whitespace between the symbol | |
473 | * or address and the '+' or '-' symbols, we | |
474 | * remember the character and replace it with a | |
475 | * null so the symbol/value can be properly parsed | |
476 | */ | |
477 | cp = strpbrk(symname, "+-"); | |
478 | if (cp != NULL) { | |
479 | symbol = *cp; | |
480 | *cp++ = '\0'; | |
481 | } | |
482 | ||
483 | if (symname[0] == '$') { | |
484 | diag = kdbgetulenv(&symname[1], &addr); | |
485 | if (diag) | |
486 | return diag; | |
487 | } else if (symname[0] == '%') { | |
488 | diag = kdb_check_regs(); | |
489 | if (diag) | |
490 | return diag; | |
491 | /* Implement register values with % at a later time as it is | |
492 | * arch optional. | |
493 | */ | |
494 | return KDB_NOTIMP; | |
495 | } else { | |
496 | found = kdbgetsymval(symname, &symtab); | |
497 | if (found) { | |
498 | addr = symtab.sym_start; | |
499 | } else { | |
500 | diag = kdbgetularg(argv[*nextarg], &addr); | |
501 | if (diag) | |
502 | return diag; | |
503 | } | |
504 | } | |
505 | ||
506 | if (!found) | |
507 | found = kdbnearsym(addr, &symtab); | |
508 | ||
509 | (*nextarg)++; | |
510 | ||
511 | if (name) | |
512 | *name = symname; | |
513 | if (value) | |
514 | *value = addr; | |
515 | if (offset && name && *name) | |
516 | *offset = addr - symtab.sym_start; | |
517 | ||
518 | if ((*nextarg > argc) | |
519 | && (symbol == '\0')) | |
520 | return 0; | |
521 | ||
522 | /* | |
523 | * check for +/- and offset | |
524 | */ | |
525 | ||
526 | if (symbol == '\0') { | |
527 | if ((argv[*nextarg][0] != '+') | |
528 | && (argv[*nextarg][0] != '-')) { | |
529 | /* | |
530 | * Not our argument. Return. | |
531 | */ | |
532 | return 0; | |
533 | } else { | |
534 | positive = (argv[*nextarg][0] == '+'); | |
535 | (*nextarg)++; | |
536 | } | |
537 | } else | |
538 | positive = (symbol == '+'); | |
539 | ||
540 | /* | |
541 | * Now there must be an offset! | |
542 | */ | |
543 | if ((*nextarg > argc) | |
544 | && (symbol == '\0')) { | |
545 | return KDB_INVADDRFMT; | |
546 | } | |
547 | ||
548 | if (!symbol) { | |
549 | cp = (char *)argv[*nextarg]; | |
550 | (*nextarg)++; | |
551 | } | |
552 | ||
553 | diag = kdbgetularg(cp, &off); | |
554 | if (diag) | |
555 | return diag; | |
556 | ||
557 | if (!positive) | |
558 | off = -off; | |
559 | ||
560 | if (offset) | |
561 | *offset += off; | |
562 | ||
563 | if (value) | |
564 | *value += off; | |
565 | ||
566 | return 0; | |
567 | } | |
568 | ||
569 | static void kdb_cmderror(int diag) | |
570 | { | |
571 | int i; | |
572 | ||
573 | if (diag >= 0) { | |
574 | kdb_printf("no error detected (diagnostic is %d)\n", diag); | |
575 | return; | |
576 | } | |
577 | ||
578 | for (i = 0; i < __nkdb_err; i++) { | |
579 | if (kdbmsgs[i].km_diag == diag) { | |
580 | kdb_printf("diag: %d: %s\n", diag, kdbmsgs[i].km_msg); | |
581 | return; | |
582 | } | |
583 | } | |
584 | ||
585 | kdb_printf("Unknown diag %d\n", -diag); | |
586 | } | |
587 | ||
588 | /* | |
589 | * kdb_defcmd, kdb_defcmd2 - This function implements the 'defcmd' | |
590 | * command which defines one command as a set of other commands, | |
591 | * terminated by endefcmd. kdb_defcmd processes the initial | |
592 | * 'defcmd' command, kdb_defcmd2 is invoked from kdb_parse for | |
593 | * the following commands until 'endefcmd'. | |
594 | * Inputs: | |
595 | * argc argument count | |
596 | * argv argument vector | |
597 | * Returns: | |
598 | * zero for success, a kdb diagnostic if error | |
599 | */ | |
600 | struct defcmd_set { | |
601 | int count; | |
602 | int usable; | |
603 | char *name; | |
604 | char *usage; | |
605 | char *help; | |
606 | char **command; | |
607 | }; | |
608 | static struct defcmd_set *defcmd_set; | |
609 | static int defcmd_set_count; | |
610 | static int defcmd_in_progress; | |
611 | ||
612 | /* Forward references */ | |
613 | static int kdb_exec_defcmd(int argc, const char **argv); | |
614 | ||
615 | static int kdb_defcmd2(const char *cmdstr, const char *argv0) | |
616 | { | |
617 | struct defcmd_set *s = defcmd_set + defcmd_set_count - 1; | |
618 | char **save_command = s->command; | |
619 | if (strcmp(argv0, "endefcmd") == 0) { | |
620 | defcmd_in_progress = 0; | |
621 | if (!s->count) | |
622 | s->usable = 0; | |
623 | if (s->usable) | |
624 | kdb_register(s->name, kdb_exec_defcmd, | |
625 | s->usage, s->help, 0); | |
626 | return 0; | |
627 | } | |
628 | if (!s->usable) | |
629 | return KDB_NOTIMP; | |
630 | s->command = kmalloc((s->count + 1) * sizeof(*(s->command)), GFP_KDB); | |
631 | if (!s->command) { | |
632 | kdb_printf("Could not allocate new kdb_defcmd table for %s\n", | |
633 | cmdstr); | |
634 | s->usable = 0; | |
635 | return KDB_NOTIMP; | |
636 | } | |
637 | memcpy(s->command, save_command, s->count * sizeof(*(s->command))); | |
638 | s->command[s->count++] = kdb_strdup(cmdstr, GFP_KDB); | |
639 | kfree(save_command); | |
640 | return 0; | |
641 | } | |
642 | ||
643 | static int kdb_defcmd(int argc, const char **argv) | |
644 | { | |
645 | struct defcmd_set *save_defcmd_set = defcmd_set, *s; | |
646 | if (defcmd_in_progress) { | |
647 | kdb_printf("kdb: nested defcmd detected, assuming missing " | |
648 | "endefcmd\n"); | |
649 | kdb_defcmd2("endefcmd", "endefcmd"); | |
650 | } | |
651 | if (argc == 0) { | |
652 | int i; | |
653 | for (s = defcmd_set; s < defcmd_set + defcmd_set_count; ++s) { | |
654 | kdb_printf("defcmd %s \"%s\" \"%s\"\n", s->name, | |
655 | s->usage, s->help); | |
656 | for (i = 0; i < s->count; ++i) | |
657 | kdb_printf("%s", s->command[i]); | |
658 | kdb_printf("endefcmd\n"); | |
659 | } | |
660 | return 0; | |
661 | } | |
662 | if (argc != 3) | |
663 | return KDB_ARGCOUNT; | |
664 | defcmd_set = kmalloc((defcmd_set_count + 1) * sizeof(*defcmd_set), | |
665 | GFP_KDB); | |
666 | if (!defcmd_set) { | |
667 | kdb_printf("Could not allocate new defcmd_set entry for %s\n", | |
668 | argv[1]); | |
669 | defcmd_set = save_defcmd_set; | |
670 | return KDB_NOTIMP; | |
671 | } | |
672 | memcpy(defcmd_set, save_defcmd_set, | |
673 | defcmd_set_count * sizeof(*defcmd_set)); | |
674 | kfree(save_defcmd_set); | |
675 | s = defcmd_set + defcmd_set_count; | |
676 | memset(s, 0, sizeof(*s)); | |
677 | s->usable = 1; | |
678 | s->name = kdb_strdup(argv[1], GFP_KDB); | |
679 | s->usage = kdb_strdup(argv[2], GFP_KDB); | |
680 | s->help = kdb_strdup(argv[3], GFP_KDB); | |
681 | if (s->usage[0] == '"') { | |
682 | strcpy(s->usage, s->usage+1); | |
683 | s->usage[strlen(s->usage)-1] = '\0'; | |
684 | } | |
685 | if (s->help[0] == '"') { | |
686 | strcpy(s->help, s->help+1); | |
687 | s->help[strlen(s->help)-1] = '\0'; | |
688 | } | |
689 | ++defcmd_set_count; | |
690 | defcmd_in_progress = 1; | |
691 | return 0; | |
692 | } | |
693 | ||
694 | /* | |
695 | * kdb_exec_defcmd - Execute the set of commands associated with this | |
696 | * defcmd name. | |
697 | * Inputs: | |
698 | * argc argument count | |
699 | * argv argument vector | |
700 | * Returns: | |
701 | * zero for success, a kdb diagnostic if error | |
702 | */ | |
703 | static int kdb_exec_defcmd(int argc, const char **argv) | |
704 | { | |
705 | int i, ret; | |
706 | struct defcmd_set *s; | |
707 | if (argc != 0) | |
708 | return KDB_ARGCOUNT; | |
709 | for (s = defcmd_set, i = 0; i < defcmd_set_count; ++i, ++s) { | |
710 | if (strcmp(s->name, argv[0]) == 0) | |
711 | break; | |
712 | } | |
713 | if (i == defcmd_set_count) { | |
714 | kdb_printf("kdb_exec_defcmd: could not find commands for %s\n", | |
715 | argv[0]); | |
716 | return KDB_NOTIMP; | |
717 | } | |
718 | for (i = 0; i < s->count; ++i) { | |
719 | /* Recursive use of kdb_parse, do not use argv after | |
720 | * this point */ | |
721 | argv = NULL; | |
722 | kdb_printf("[%s]kdb> %s\n", s->name, s->command[i]); | |
723 | ret = kdb_parse(s->command[i]); | |
724 | if (ret) | |
725 | return ret; | |
726 | } | |
727 | return 0; | |
728 | } | |
729 | ||
730 | /* Command history */ | |
731 | #define KDB_CMD_HISTORY_COUNT 32 | |
732 | #define CMD_BUFLEN 200 /* kdb_printf: max printline | |
733 | * size == 256 */ | |
734 | static unsigned int cmd_head, cmd_tail; | |
735 | static unsigned int cmdptr; | |
736 | static char cmd_hist[KDB_CMD_HISTORY_COUNT][CMD_BUFLEN]; | |
737 | static char cmd_cur[CMD_BUFLEN]; | |
738 | ||
739 | /* | |
740 | * The "str" argument may point to something like | grep xyz | |
741 | */ | |
742 | static void parse_grep(const char *str) | |
743 | { | |
744 | int len; | |
745 | char *cp = (char *)str, *cp2; | |
746 | ||
747 | /* sanity check: we should have been called with the \ first */ | |
748 | if (*cp != '|') | |
749 | return; | |
750 | cp++; | |
751 | while (isspace(*cp)) | |
752 | cp++; | |
753 | if (strncmp(cp, "grep ", 5)) { | |
754 | kdb_printf("invalid 'pipe', see grephelp\n"); | |
755 | return; | |
756 | } | |
757 | cp += 5; | |
758 | while (isspace(*cp)) | |
759 | cp++; | |
760 | cp2 = strchr(cp, '\n'); | |
761 | if (cp2) | |
762 | *cp2 = '\0'; /* remove the trailing newline */ | |
763 | len = strlen(cp); | |
764 | if (len == 0) { | |
765 | kdb_printf("invalid 'pipe', see grephelp\n"); | |
766 | return; | |
767 | } | |
768 | /* now cp points to a nonzero length search string */ | |
769 | if (*cp == '"') { | |
770 | /* allow it be "x y z" by removing the "'s - there must | |
771 | be two of them */ | |
772 | cp++; | |
773 | cp2 = strchr(cp, '"'); | |
774 | if (!cp2) { | |
775 | kdb_printf("invalid quoted string, see grephelp\n"); | |
776 | return; | |
777 | } | |
778 | *cp2 = '\0'; /* end the string where the 2nd " was */ | |
779 | } | |
780 | kdb_grep_leading = 0; | |
781 | if (*cp == '^') { | |
782 | kdb_grep_leading = 1; | |
783 | cp++; | |
784 | } | |
785 | len = strlen(cp); | |
786 | kdb_grep_trailing = 0; | |
787 | if (*(cp+len-1) == '$') { | |
788 | kdb_grep_trailing = 1; | |
789 | *(cp+len-1) = '\0'; | |
790 | } | |
791 | len = strlen(cp); | |
792 | if (!len) | |
793 | return; | |
794 | if (len >= GREP_LEN) { | |
795 | kdb_printf("search string too long\n"); | |
796 | return; | |
797 | } | |
798 | strcpy(kdb_grep_string, cp); | |
799 | kdb_grepping_flag++; | |
800 | return; | |
801 | } | |
802 | ||
803 | /* | |
804 | * kdb_parse - Parse the command line, search the command table for a | |
805 | * matching command and invoke the command function. This | |
806 | * function may be called recursively, if it is, the second call | |
807 | * will overwrite argv and cbuf. It is the caller's | |
808 | * responsibility to save their argv if they recursively call | |
809 | * kdb_parse(). | |
810 | * Parameters: | |
811 | * cmdstr The input command line to be parsed. | |
812 | * regs The registers at the time kdb was entered. | |
813 | * Returns: | |
814 | * Zero for success, a kdb diagnostic if failure. | |
815 | * Remarks: | |
816 | * Limited to 20 tokens. | |
817 | * | |
818 | * Real rudimentary tokenization. Basically only whitespace | |
819 | * is considered a token delimeter (but special consideration | |
820 | * is taken of the '=' sign as used by the 'set' command). | |
821 | * | |
822 | * The algorithm used to tokenize the input string relies on | |
823 | * there being at least one whitespace (or otherwise useless) | |
824 | * character between tokens as the character immediately following | |
825 | * the token is altered in-place to a null-byte to terminate the | |
826 | * token string. | |
827 | */ | |
828 | ||
829 | #define MAXARGC 20 | |
830 | ||
831 | int kdb_parse(const char *cmdstr) | |
832 | { | |
833 | static char *argv[MAXARGC]; | |
834 | static int argc; | |
835 | static char cbuf[CMD_BUFLEN+2]; | |
836 | char *cp; | |
837 | char *cpp, quoted; | |
838 | kdbtab_t *tp; | |
839 | int i, escaped, ignore_errors = 0, check_grep; | |
840 | ||
841 | /* | |
842 | * First tokenize the command string. | |
843 | */ | |
844 | cp = (char *)cmdstr; | |
845 | kdb_grepping_flag = check_grep = 0; | |
846 | ||
847 | if (KDB_FLAG(CMD_INTERRUPT)) { | |
848 | /* Previous command was interrupted, newline must not | |
849 | * repeat the command */ | |
850 | KDB_FLAG_CLEAR(CMD_INTERRUPT); | |
851 | KDB_STATE_SET(PAGER); | |
852 | argc = 0; /* no repeat */ | |
853 | } | |
854 | ||
855 | if (*cp != '\n' && *cp != '\0') { | |
856 | argc = 0; | |
857 | cpp = cbuf; | |
858 | while (*cp) { | |
859 | /* skip whitespace */ | |
860 | while (isspace(*cp)) | |
861 | cp++; | |
862 | if ((*cp == '\0') || (*cp == '\n') || | |
863 | (*cp == '#' && !defcmd_in_progress)) | |
864 | break; | |
865 | /* special case: check for | grep pattern */ | |
866 | if (*cp == '|') { | |
867 | check_grep++; | |
868 | break; | |
869 | } | |
870 | if (cpp >= cbuf + CMD_BUFLEN) { | |
871 | kdb_printf("kdb_parse: command buffer " | |
872 | "overflow, command ignored\n%s\n", | |
873 | cmdstr); | |
874 | return KDB_NOTFOUND; | |
875 | } | |
876 | if (argc >= MAXARGC - 1) { | |
877 | kdb_printf("kdb_parse: too many arguments, " | |
878 | "command ignored\n%s\n", cmdstr); | |
879 | return KDB_NOTFOUND; | |
880 | } | |
881 | argv[argc++] = cpp; | |
882 | escaped = 0; | |
883 | quoted = '\0'; | |
884 | /* Copy to next unquoted and unescaped | |
885 | * whitespace or '=' */ | |
886 | while (*cp && *cp != '\n' && | |
887 | (escaped || quoted || !isspace(*cp))) { | |
888 | if (cpp >= cbuf + CMD_BUFLEN) | |
889 | break; | |
890 | if (escaped) { | |
891 | escaped = 0; | |
892 | *cpp++ = *cp++; | |
893 | continue; | |
894 | } | |
895 | if (*cp == '\\') { | |
896 | escaped = 1; | |
897 | ++cp; | |
898 | continue; | |
899 | } | |
900 | if (*cp == quoted) | |
901 | quoted = '\0'; | |
902 | else if (*cp == '\'' || *cp == '"') | |
903 | quoted = *cp; | |
904 | *cpp = *cp++; | |
905 | if (*cpp == '=' && !quoted) | |
906 | break; | |
907 | ++cpp; | |
908 | } | |
909 | *cpp++ = '\0'; /* Squash a ws or '=' character */ | |
910 | } | |
911 | } | |
912 | if (!argc) | |
913 | return 0; | |
914 | if (check_grep) | |
915 | parse_grep(cp); | |
916 | if (defcmd_in_progress) { | |
917 | int result = kdb_defcmd2(cmdstr, argv[0]); | |
918 | if (!defcmd_in_progress) { | |
919 | argc = 0; /* avoid repeat on endefcmd */ | |
920 | *(argv[0]) = '\0'; | |
921 | } | |
922 | return result; | |
923 | } | |
924 | if (argv[0][0] == '-' && argv[0][1] && | |
925 | (argv[0][1] < '0' || argv[0][1] > '9')) { | |
926 | ignore_errors = 1; | |
927 | ++argv[0]; | |
928 | } | |
929 | ||
930 | for_each_kdbcmd(tp, i) { | |
931 | if (tp->cmd_name) { | |
932 | /* | |
933 | * If this command is allowed to be abbreviated, | |
934 | * check to see if this is it. | |
935 | */ | |
936 | ||
937 | if (tp->cmd_minlen | |
938 | && (strlen(argv[0]) <= tp->cmd_minlen)) { | |
939 | if (strncmp(argv[0], | |
940 | tp->cmd_name, | |
941 | tp->cmd_minlen) == 0) { | |
942 | break; | |
943 | } | |
944 | } | |
945 | ||
946 | if (strcmp(argv[0], tp->cmd_name) == 0) | |
947 | break; | |
948 | } | |
949 | } | |
950 | ||
951 | /* | |
952 | * If we don't find a command by this name, see if the first | |
953 | * few characters of this match any of the known commands. | |
954 | * e.g., md1c20 should match md. | |
955 | */ | |
956 | if (i == kdb_max_commands) { | |
957 | for_each_kdbcmd(tp, i) { | |
958 | if (tp->cmd_name) { | |
959 | if (strncmp(argv[0], | |
960 | tp->cmd_name, | |
961 | strlen(tp->cmd_name)) == 0) { | |
962 | break; | |
963 | } | |
964 | } | |
965 | } | |
966 | } | |
967 | ||
968 | if (i < kdb_max_commands) { | |
969 | int result; | |
970 | KDB_STATE_SET(CMD); | |
971 | result = (*tp->cmd_func)(argc-1, (const char **)argv); | |
972 | if (result && ignore_errors && result > KDB_CMD_GO) | |
973 | result = 0; | |
974 | KDB_STATE_CLEAR(CMD); | |
975 | switch (tp->cmd_repeat) { | |
976 | case KDB_REPEAT_NONE: | |
977 | argc = 0; | |
978 | if (argv[0]) | |
979 | *(argv[0]) = '\0'; | |
980 | break; | |
981 | case KDB_REPEAT_NO_ARGS: | |
982 | argc = 1; | |
983 | if (argv[1]) | |
984 | *(argv[1]) = '\0'; | |
985 | break; | |
986 | case KDB_REPEAT_WITH_ARGS: | |
987 | break; | |
988 | } | |
989 | return result; | |
990 | } | |
991 | ||
992 | /* | |
993 | * If the input with which we were presented does not | |
994 | * map to an existing command, attempt to parse it as an | |
995 | * address argument and display the result. Useful for | |
996 | * obtaining the address of a variable, or the nearest symbol | |
997 | * to an address contained in a register. | |
998 | */ | |
999 | { | |
1000 | unsigned long value; | |
1001 | char *name = NULL; | |
1002 | long offset; | |
1003 | int nextarg = 0; | |
1004 | ||
1005 | if (kdbgetaddrarg(0, (const char **)argv, &nextarg, | |
1006 | &value, &offset, &name)) { | |
1007 | return KDB_NOTFOUND; | |
1008 | } | |
1009 | ||
1010 | kdb_printf("%s = ", argv[0]); | |
1011 | kdb_symbol_print(value, NULL, KDB_SP_DEFAULT); | |
1012 | kdb_printf("\n"); | |
1013 | return 0; | |
1014 | } | |
1015 | } | |
1016 | ||
1017 | ||
1018 | static int handle_ctrl_cmd(char *cmd) | |
1019 | { | |
1020 | #define CTRL_P 16 | |
1021 | #define CTRL_N 14 | |
1022 | ||
1023 | /* initial situation */ | |
1024 | if (cmd_head == cmd_tail) | |
1025 | return 0; | |
1026 | switch (*cmd) { | |
1027 | case CTRL_P: | |
1028 | if (cmdptr != cmd_tail) | |
1029 | cmdptr = (cmdptr-1) % KDB_CMD_HISTORY_COUNT; | |
1030 | strncpy(cmd_cur, cmd_hist[cmdptr], CMD_BUFLEN); | |
1031 | return 1; | |
1032 | case CTRL_N: | |
1033 | if (cmdptr != cmd_head) | |
1034 | cmdptr = (cmdptr+1) % KDB_CMD_HISTORY_COUNT; | |
1035 | strncpy(cmd_cur, cmd_hist[cmdptr], CMD_BUFLEN); | |
1036 | return 1; | |
1037 | } | |
1038 | return 0; | |
1039 | } | |
1040 | ||
1041 | /* | |
1042 | * kdb_reboot - This function implements the 'reboot' command. Reboot | |
1043 | * the system immediately, or loop for ever on failure. | |
1044 | */ | |
1045 | static int kdb_reboot(int argc, const char **argv) | |
1046 | { | |
1047 | emergency_restart(); | |
1048 | kdb_printf("Hmm, kdb_reboot did not reboot, spinning here\n"); | |
1049 | while (1) | |
1050 | cpu_relax(); | |
1051 | /* NOTREACHED */ | |
1052 | return 0; | |
1053 | } | |
1054 | ||
1055 | static void kdb_dumpregs(struct pt_regs *regs) | |
1056 | { | |
1057 | int old_lvl = console_loglevel; | |
1058 | console_loglevel = 15; | |
1059 | show_regs(regs); | |
1060 | kdb_printf("\n"); | |
1061 | console_loglevel = old_lvl; | |
1062 | } | |
1063 | ||
1064 | void kdb_set_current_task(struct task_struct *p) | |
1065 | { | |
1066 | kdb_current_task = p; | |
1067 | ||
1068 | if (kdb_task_has_cpu(p)) { | |
1069 | kdb_current_regs = KDB_TSKREGS(kdb_process_cpu(p)); | |
1070 | return; | |
1071 | } | |
1072 | kdb_current_regs = NULL; | |
1073 | } | |
1074 | ||
1075 | /* | |
1076 | * kdb_local - The main code for kdb. This routine is invoked on a | |
1077 | * specific processor, it is not global. The main kdb() routine | |
1078 | * ensures that only one processor at a time is in this routine. | |
1079 | * This code is called with the real reason code on the first | |
1080 | * entry to a kdb session, thereafter it is called with reason | |
1081 | * SWITCH, even if the user goes back to the original cpu. | |
1082 | * Inputs: | |
1083 | * reason The reason KDB was invoked | |
1084 | * error The hardware-defined error code | |
1085 | * regs The exception frame at time of fault/breakpoint. | |
1086 | * db_result Result code from the break or debug point. | |
1087 | * Returns: | |
1088 | * 0 KDB was invoked for an event which it wasn't responsible | |
1089 | * 1 KDB handled the event for which it was invoked. | |
1090 | * KDB_CMD_GO User typed 'go'. | |
1091 | * KDB_CMD_CPU User switched to another cpu. | |
1092 | * KDB_CMD_SS Single step. | |
1093 | * KDB_CMD_SSB Single step until branch. | |
1094 | */ | |
1095 | static int kdb_local(kdb_reason_t reason, int error, struct pt_regs *regs, | |
1096 | kdb_dbtrap_t db_result) | |
1097 | { | |
1098 | char *cmdbuf; | |
1099 | int diag; | |
1100 | struct task_struct *kdb_current = | |
1101 | kdb_curr_task(raw_smp_processor_id()); | |
1102 | ||
1103 | KDB_DEBUG_STATE("kdb_local 1", reason); | |
1104 | kdb_go_count = 0; | |
1105 | if (reason == KDB_REASON_DEBUG) { | |
1106 | /* special case below */ | |
1107 | } else { | |
1108 | kdb_printf("\nEntering kdb (current=0x%p, pid %d) ", | |
1109 | kdb_current, kdb_current->pid); | |
1110 | #if defined(CONFIG_SMP) | |
1111 | kdb_printf("on processor %d ", raw_smp_processor_id()); | |
1112 | #endif | |
1113 | } | |
1114 | ||
1115 | switch (reason) { | |
1116 | case KDB_REASON_DEBUG: | |
1117 | { | |
1118 | /* | |
1119 | * If re-entering kdb after a single step | |
1120 | * command, don't print the message. | |
1121 | */ | |
1122 | switch (db_result) { | |
1123 | case KDB_DB_BPT: | |
1124 | kdb_printf("\nEntering kdb (0x%p, pid %d) ", | |
1125 | kdb_current, kdb_current->pid); | |
1126 | #if defined(CONFIG_SMP) | |
1127 | kdb_printf("on processor %d ", raw_smp_processor_id()); | |
1128 | #endif | |
1129 | kdb_printf("due to Debug @ " kdb_machreg_fmt "\n", | |
1130 | instruction_pointer(regs)); | |
1131 | break; | |
1132 | case KDB_DB_SSB: | |
1133 | /* | |
1134 | * In the midst of ssb command. Just return. | |
1135 | */ | |
1136 | KDB_DEBUG_STATE("kdb_local 3", reason); | |
1137 | return KDB_CMD_SSB; /* Continue with SSB command */ | |
1138 | ||
1139 | break; | |
1140 | case KDB_DB_SS: | |
1141 | break; | |
1142 | case KDB_DB_SSBPT: | |
1143 | KDB_DEBUG_STATE("kdb_local 4", reason); | |
1144 | return 1; /* kdba_db_trap did the work */ | |
1145 | default: | |
1146 | kdb_printf("kdb: Bad result from kdba_db_trap: %d\n", | |
1147 | db_result); | |
1148 | break; | |
1149 | } | |
1150 | ||
1151 | } | |
1152 | break; | |
1153 | case KDB_REASON_ENTER: | |
1154 | if (KDB_STATE(KEYBOARD)) | |
1155 | kdb_printf("due to Keyboard Entry\n"); | |
1156 | else | |
1157 | kdb_printf("due to KDB_ENTER()\n"); | |
1158 | break; | |
1159 | case KDB_REASON_KEYBOARD: | |
1160 | KDB_STATE_SET(KEYBOARD); | |
1161 | kdb_printf("due to Keyboard Entry\n"); | |
1162 | break; | |
1163 | case KDB_REASON_ENTER_SLAVE: | |
1164 | /* drop through, slaves only get released via cpu switch */ | |
1165 | case KDB_REASON_SWITCH: | |
1166 | kdb_printf("due to cpu switch\n"); | |
1167 | break; | |
1168 | case KDB_REASON_OOPS: | |
1169 | kdb_printf("Oops: %s\n", kdb_diemsg); | |
1170 | kdb_printf("due to oops @ " kdb_machreg_fmt "\n", | |
1171 | instruction_pointer(regs)); | |
1172 | kdb_dumpregs(regs); | |
1173 | break; | |
1174 | case KDB_REASON_NMI: | |
1175 | kdb_printf("due to NonMaskable Interrupt @ " | |
1176 | kdb_machreg_fmt "\n", | |
1177 | instruction_pointer(regs)); | |
1178 | kdb_dumpregs(regs); | |
1179 | break; | |
1180 | case KDB_REASON_SSTEP: | |
1181 | case KDB_REASON_BREAK: | |
1182 | kdb_printf("due to %s @ " kdb_machreg_fmt "\n", | |
1183 | reason == KDB_REASON_BREAK ? | |
1184 | "Breakpoint" : "SS trap", instruction_pointer(regs)); | |
1185 | /* | |
1186 | * Determine if this breakpoint is one that we | |
1187 | * are interested in. | |
1188 | */ | |
1189 | if (db_result != KDB_DB_BPT) { | |
1190 | kdb_printf("kdb: error return from kdba_bp_trap: %d\n", | |
1191 | db_result); | |
1192 | KDB_DEBUG_STATE("kdb_local 6", reason); | |
1193 | return 0; /* Not for us, dismiss it */ | |
1194 | } | |
1195 | break; | |
1196 | case KDB_REASON_RECURSE: | |
1197 | kdb_printf("due to Recursion @ " kdb_machreg_fmt "\n", | |
1198 | instruction_pointer(regs)); | |
1199 | break; | |
1200 | default: | |
1201 | kdb_printf("kdb: unexpected reason code: %d\n", reason); | |
1202 | KDB_DEBUG_STATE("kdb_local 8", reason); | |
1203 | return 0; /* Not for us, dismiss it */ | |
1204 | } | |
1205 | ||
1206 | while (1) { | |
1207 | /* | |
1208 | * Initialize pager context. | |
1209 | */ | |
1210 | kdb_nextline = 1; | |
1211 | KDB_STATE_CLEAR(SUPPRESS); | |
1212 | ||
1213 | cmdbuf = cmd_cur; | |
1214 | *cmdbuf = '\0'; | |
1215 | *(cmd_hist[cmd_head]) = '\0'; | |
1216 | ||
1217 | if (KDB_FLAG(ONLY_DO_DUMP)) { | |
1218 | /* kdb is off but a catastrophic error requires a dump. | |
1219 | * Take the dump and reboot. | |
1220 | * Turn on logging so the kdb output appears in the log | |
1221 | * buffer in the dump. | |
1222 | */ | |
1223 | const char *setargs[] = { "set", "LOGGING", "1" }; | |
1224 | kdb_set(2, setargs); | |
1225 | kdb_reboot(0, NULL); | |
1226 | /*NOTREACHED*/ | |
1227 | } | |
1228 | ||
1229 | do_full_getstr: | |
1230 | #if defined(CONFIG_SMP) | |
1231 | snprintf(kdb_prompt_str, CMD_BUFLEN, kdbgetenv("PROMPT"), | |
1232 | raw_smp_processor_id()); | |
1233 | #else | |
1234 | snprintf(kdb_prompt_str, CMD_BUFLEN, kdbgetenv("PROMPT")); | |
1235 | #endif | |
1236 | if (defcmd_in_progress) | |
1237 | strncat(kdb_prompt_str, "[defcmd]", CMD_BUFLEN); | |
1238 | ||
1239 | /* | |
1240 | * Fetch command from keyboard | |
1241 | */ | |
1242 | cmdbuf = kdb_getstr(cmdbuf, CMD_BUFLEN, kdb_prompt_str); | |
1243 | if (*cmdbuf != '\n') { | |
1244 | if (*cmdbuf < 32) { | |
1245 | if (cmdptr == cmd_head) { | |
1246 | strncpy(cmd_hist[cmd_head], cmd_cur, | |
1247 | CMD_BUFLEN); | |
1248 | *(cmd_hist[cmd_head] + | |
1249 | strlen(cmd_hist[cmd_head])-1) = '\0'; | |
1250 | } | |
1251 | if (!handle_ctrl_cmd(cmdbuf)) | |
1252 | *(cmd_cur+strlen(cmd_cur)-1) = '\0'; | |
1253 | cmdbuf = cmd_cur; | |
1254 | goto do_full_getstr; | |
1255 | } else { | |
1256 | strncpy(cmd_hist[cmd_head], cmd_cur, | |
1257 | CMD_BUFLEN); | |
1258 | } | |
1259 | ||
1260 | cmd_head = (cmd_head+1) % KDB_CMD_HISTORY_COUNT; | |
1261 | if (cmd_head == cmd_tail) | |
1262 | cmd_tail = (cmd_tail+1) % KDB_CMD_HISTORY_COUNT; | |
1263 | } | |
1264 | ||
1265 | cmdptr = cmd_head; | |
1266 | diag = kdb_parse(cmdbuf); | |
1267 | if (diag == KDB_NOTFOUND) { | |
1268 | kdb_printf("Unknown kdb command: '%s'\n", cmdbuf); | |
1269 | diag = 0; | |
1270 | } | |
1271 | if (diag == KDB_CMD_GO | |
1272 | || diag == KDB_CMD_CPU | |
1273 | || diag == KDB_CMD_SS | |
1274 | || diag == KDB_CMD_SSB | |
1275 | || diag == KDB_CMD_KGDB) | |
1276 | break; | |
1277 | ||
1278 | if (diag) | |
1279 | kdb_cmderror(diag); | |
1280 | } | |
1281 | KDB_DEBUG_STATE("kdb_local 9", diag); | |
1282 | return diag; | |
1283 | } | |
1284 | ||
1285 | ||
1286 | /* | |
1287 | * kdb_print_state - Print the state data for the current processor | |
1288 | * for debugging. | |
1289 | * Inputs: | |
1290 | * text Identifies the debug point | |
1291 | * value Any integer value to be printed, e.g. reason code. | |
1292 | */ | |
1293 | void kdb_print_state(const char *text, int value) | |
1294 | { | |
1295 | kdb_printf("state: %s cpu %d value %d initial %d state %x\n", | |
1296 | text, raw_smp_processor_id(), value, kdb_initial_cpu, | |
1297 | kdb_state); | |
1298 | } | |
1299 | ||
1300 | /* | |
1301 | * kdb_main_loop - After initial setup and assignment of the | |
1302 | * controlling cpu, all cpus are in this loop. One cpu is in | |
1303 | * control and will issue the kdb prompt, the others will spin | |
1304 | * until 'go' or cpu switch. | |
1305 | * | |
1306 | * To get a consistent view of the kernel stacks for all | |
1307 | * processes, this routine is invoked from the main kdb code via | |
1308 | * an architecture specific routine. kdba_main_loop is | |
1309 | * responsible for making the kernel stacks consistent for all | |
1310 | * processes, there should be no difference between a blocked | |
1311 | * process and a running process as far as kdb is concerned. | |
1312 | * Inputs: | |
1313 | * reason The reason KDB was invoked | |
1314 | * error The hardware-defined error code | |
1315 | * reason2 kdb's current reason code. | |
1316 | * Initially error but can change | |
1317 | * acording to kdb state. | |
1318 | * db_result Result code from break or debug point. | |
1319 | * regs The exception frame at time of fault/breakpoint. | |
1320 | * should always be valid. | |
1321 | * Returns: | |
1322 | * 0 KDB was invoked for an event which it wasn't responsible | |
1323 | * 1 KDB handled the event for which it was invoked. | |
1324 | */ | |
1325 | int kdb_main_loop(kdb_reason_t reason, kdb_reason_t reason2, int error, | |
1326 | kdb_dbtrap_t db_result, struct pt_regs *regs) | |
1327 | { | |
1328 | int result = 1; | |
1329 | /* Stay in kdb() until 'go', 'ss[b]' or an error */ | |
1330 | while (1) { | |
1331 | /* | |
1332 | * All processors except the one that is in control | |
1333 | * will spin here. | |
1334 | */ | |
1335 | KDB_DEBUG_STATE("kdb_main_loop 1", reason); | |
1336 | while (KDB_STATE(HOLD_CPU)) { | |
1337 | /* state KDB is turned off by kdb_cpu to see if the | |
1338 | * other cpus are still live, each cpu in this loop | |
1339 | * turns it back on. | |
1340 | */ | |
1341 | if (!KDB_STATE(KDB)) | |
1342 | KDB_STATE_SET(KDB); | |
1343 | } | |
1344 | ||
1345 | KDB_STATE_CLEAR(SUPPRESS); | |
1346 | KDB_DEBUG_STATE("kdb_main_loop 2", reason); | |
1347 | if (KDB_STATE(LEAVING)) | |
1348 | break; /* Another cpu said 'go' */ | |
1349 | /* Still using kdb, this processor is in control */ | |
1350 | result = kdb_local(reason2, error, regs, db_result); | |
1351 | KDB_DEBUG_STATE("kdb_main_loop 3", result); | |
1352 | ||
1353 | if (result == KDB_CMD_CPU) | |
1354 | break; | |
1355 | ||
1356 | if (result == KDB_CMD_SS) { | |
1357 | KDB_STATE_SET(DOING_SS); | |
1358 | break; | |
1359 | } | |
1360 | ||
1361 | if (result == KDB_CMD_SSB) { | |
1362 | KDB_STATE_SET(DOING_SS); | |
1363 | KDB_STATE_SET(DOING_SSB); | |
1364 | break; | |
1365 | } | |
1366 | ||
1367 | if (result == KDB_CMD_KGDB) { | |
1368 | if (!(KDB_STATE(DOING_KGDB) || KDB_STATE(DOING_KGDB2))) | |
1369 | kdb_printf("Entering please attach debugger " | |
1370 | "or use $D#44+ or $3#33\n"); | |
1371 | break; | |
1372 | } | |
1373 | if (result && result != 1 && result != KDB_CMD_GO) | |
1374 | kdb_printf("\nUnexpected kdb_local return code %d\n", | |
1375 | result); | |
1376 | KDB_DEBUG_STATE("kdb_main_loop 4", reason); | |
1377 | break; | |
1378 | } | |
1379 | if (KDB_STATE(DOING_SS)) | |
1380 | KDB_STATE_CLEAR(SSBPT); | |
1381 | ||
1382 | return result; | |
1383 | } | |
1384 | ||
1385 | /* | |
1386 | * kdb_mdr - This function implements the guts of the 'mdr', memory | |
1387 | * read command. | |
1388 | * mdr <addr arg>,<byte count> | |
1389 | * Inputs: | |
1390 | * addr Start address | |
1391 | * count Number of bytes | |
1392 | * Returns: | |
1393 | * Always 0. Any errors are detected and printed by kdb_getarea. | |
1394 | */ | |
1395 | static int kdb_mdr(unsigned long addr, unsigned int count) | |
1396 | { | |
1397 | unsigned char c; | |
1398 | while (count--) { | |
1399 | if (kdb_getarea(c, addr)) | |
1400 | return 0; | |
1401 | kdb_printf("%02x", c); | |
1402 | addr++; | |
1403 | } | |
1404 | kdb_printf("\n"); | |
1405 | return 0; | |
1406 | } | |
1407 | ||
1408 | /* | |
1409 | * kdb_md - This function implements the 'md', 'md1', 'md2', 'md4', | |
1410 | * 'md8' 'mdr' and 'mds' commands. | |
1411 | * | |
1412 | * md|mds [<addr arg> [<line count> [<radix>]]] | |
1413 | * mdWcN [<addr arg> [<line count> [<radix>]]] | |
1414 | * where W = is the width (1, 2, 4 or 8) and N is the count. | |
1415 | * for eg., md1c20 reads 20 bytes, 1 at a time. | |
1416 | * mdr <addr arg>,<byte count> | |
1417 | */ | |
1418 | static void kdb_md_line(const char *fmtstr, unsigned long addr, | |
1419 | int symbolic, int nosect, int bytesperword, | |
1420 | int num, int repeat, int phys) | |
1421 | { | |
1422 | /* print just one line of data */ | |
1423 | kdb_symtab_t symtab; | |
1424 | char cbuf[32]; | |
1425 | char *c = cbuf; | |
1426 | int i; | |
1427 | unsigned long word; | |
1428 | ||
1429 | memset(cbuf, '\0', sizeof(cbuf)); | |
1430 | if (phys) | |
1431 | kdb_printf("phys " kdb_machreg_fmt0 " ", addr); | |
1432 | else | |
1433 | kdb_printf(kdb_machreg_fmt0 " ", addr); | |
1434 | ||
1435 | for (i = 0; i < num && repeat--; i++) { | |
1436 | if (phys) { | |
1437 | if (kdb_getphysword(&word, addr, bytesperword)) | |
1438 | break; | |
1439 | } else if (kdb_getword(&word, addr, bytesperword)) | |
1440 | break; | |
1441 | kdb_printf(fmtstr, word); | |
1442 | if (symbolic) | |
1443 | kdbnearsym(word, &symtab); | |
1444 | else | |
1445 | memset(&symtab, 0, sizeof(symtab)); | |
1446 | if (symtab.sym_name) { | |
1447 | kdb_symbol_print(word, &symtab, 0); | |
1448 | if (!nosect) { | |
1449 | kdb_printf("\n"); | |
1450 | kdb_printf(" %s %s " | |
1451 | kdb_machreg_fmt " " | |
1452 | kdb_machreg_fmt " " | |
1453 | kdb_machreg_fmt, symtab.mod_name, | |
1454 | symtab.sec_name, symtab.sec_start, | |
1455 | symtab.sym_start, symtab.sym_end); | |
1456 | } | |
1457 | addr += bytesperword; | |
1458 | } else { | |
1459 | union { | |
1460 | u64 word; | |
1461 | unsigned char c[8]; | |
1462 | } wc; | |
1463 | unsigned char *cp; | |
1464 | #ifdef __BIG_ENDIAN | |
1465 | cp = wc.c + 8 - bytesperword; | |
1466 | #else | |
1467 | cp = wc.c; | |
1468 | #endif | |
1469 | wc.word = word; | |
1470 | #define printable_char(c) \ | |
1471 | ({unsigned char __c = c; isascii(__c) && isprint(__c) ? __c : '.'; }) | |
1472 | switch (bytesperword) { | |
1473 | case 8: | |
1474 | *c++ = printable_char(*cp++); | |
1475 | *c++ = printable_char(*cp++); | |
1476 | *c++ = printable_char(*cp++); | |
1477 | *c++ = printable_char(*cp++); | |
1478 | addr += 4; | |
1479 | case 4: | |
1480 | *c++ = printable_char(*cp++); | |
1481 | *c++ = printable_char(*cp++); | |
1482 | addr += 2; | |
1483 | case 2: | |
1484 | *c++ = printable_char(*cp++); | |
1485 | addr++; | |
1486 | case 1: | |
1487 | *c++ = printable_char(*cp++); | |
1488 | addr++; | |
1489 | break; | |
1490 | } | |
1491 | #undef printable_char | |
1492 | } | |
1493 | } | |
1494 | kdb_printf("%*s %s\n", (int)((num-i)*(2*bytesperword + 1)+1), | |
1495 | " ", cbuf); | |
1496 | } | |
1497 | ||
1498 | static int kdb_md(int argc, const char **argv) | |
1499 | { | |
1500 | static unsigned long last_addr; | |
1501 | static int last_radix, last_bytesperword, last_repeat; | |
1502 | int radix = 16, mdcount = 8, bytesperword = KDB_WORD_SIZE, repeat; | |
1503 | int nosect = 0; | |
1504 | char fmtchar, fmtstr[64]; | |
1505 | unsigned long addr; | |
1506 | unsigned long word; | |
1507 | long offset = 0; | |
1508 | int symbolic = 0; | |
1509 | int valid = 0; | |
1510 | int phys = 0; | |
1511 | ||
1512 | kdbgetintenv("MDCOUNT", &mdcount); | |
1513 | kdbgetintenv("RADIX", &radix); | |
1514 | kdbgetintenv("BYTESPERWORD", &bytesperword); | |
1515 | ||
1516 | /* Assume 'md <addr>' and start with environment values */ | |
1517 | repeat = mdcount * 16 / bytesperword; | |
1518 | ||
1519 | if (strcmp(argv[0], "mdr") == 0) { | |
1520 | if (argc != 2) | |
1521 | return KDB_ARGCOUNT; | |
1522 | valid = 1; | |
1523 | } else if (isdigit(argv[0][2])) { | |
1524 | bytesperword = (int)(argv[0][2] - '0'); | |
1525 | if (bytesperword == 0) { | |
1526 | bytesperword = last_bytesperword; | |
1527 | if (bytesperword == 0) | |
1528 | bytesperword = 4; | |
1529 | } | |
1530 | last_bytesperword = bytesperword; | |
1531 | repeat = mdcount * 16 / bytesperword; | |
1532 | if (!argv[0][3]) | |
1533 | valid = 1; | |
1534 | else if (argv[0][3] == 'c' && argv[0][4]) { | |
1535 | char *p; | |
1536 | repeat = simple_strtoul(argv[0] + 4, &p, 10); | |
1537 | mdcount = ((repeat * bytesperword) + 15) / 16; | |
1538 | valid = !*p; | |
1539 | } | |
1540 | last_repeat = repeat; | |
1541 | } else if (strcmp(argv[0], "md") == 0) | |
1542 | valid = 1; | |
1543 | else if (strcmp(argv[0], "mds") == 0) | |
1544 | valid = 1; | |
1545 | else if (strcmp(argv[0], "mdp") == 0) { | |
1546 | phys = valid = 1; | |
1547 | } | |
1548 | if (!valid) | |
1549 | return KDB_NOTFOUND; | |
1550 | ||
1551 | if (argc == 0) { | |
1552 | if (last_addr == 0) | |
1553 | return KDB_ARGCOUNT; | |
1554 | addr = last_addr; | |
1555 | radix = last_radix; | |
1556 | bytesperword = last_bytesperword; | |
1557 | repeat = last_repeat; | |
1558 | mdcount = ((repeat * bytesperword) + 15) / 16; | |
1559 | } | |
1560 | ||
1561 | if (argc) { | |
1562 | unsigned long val; | |
1563 | int diag, nextarg = 1; | |
1564 | diag = kdbgetaddrarg(argc, argv, &nextarg, &addr, | |
1565 | &offset, NULL); | |
1566 | if (diag) | |
1567 | return diag; | |
1568 | if (argc > nextarg+2) | |
1569 | return KDB_ARGCOUNT; | |
1570 | ||
1571 | if (argc >= nextarg) { | |
1572 | diag = kdbgetularg(argv[nextarg], &val); | |
1573 | if (!diag) { | |
1574 | mdcount = (int) val; | |
1575 | repeat = mdcount * 16 / bytesperword; | |
1576 | } | |
1577 | } | |
1578 | if (argc >= nextarg+1) { | |
1579 | diag = kdbgetularg(argv[nextarg+1], &val); | |
1580 | if (!diag) | |
1581 | radix = (int) val; | |
1582 | } | |
1583 | } | |
1584 | ||
1585 | if (strcmp(argv[0], "mdr") == 0) | |
1586 | return kdb_mdr(addr, mdcount); | |
1587 | ||
1588 | switch (radix) { | |
1589 | case 10: | |
1590 | fmtchar = 'd'; | |
1591 | break; | |
1592 | case 16: | |
1593 | fmtchar = 'x'; | |
1594 | break; | |
1595 | case 8: | |
1596 | fmtchar = 'o'; | |
1597 | break; | |
1598 | default: | |
1599 | return KDB_BADRADIX; | |
1600 | } | |
1601 | ||
1602 | last_radix = radix; | |
1603 | ||
1604 | if (bytesperword > KDB_WORD_SIZE) | |
1605 | return KDB_BADWIDTH; | |
1606 | ||
1607 | switch (bytesperword) { | |
1608 | case 8: | |
1609 | sprintf(fmtstr, "%%16.16l%c ", fmtchar); | |
1610 | break; | |
1611 | case 4: | |
1612 | sprintf(fmtstr, "%%8.8l%c ", fmtchar); | |
1613 | break; | |
1614 | case 2: | |
1615 | sprintf(fmtstr, "%%4.4l%c ", fmtchar); | |
1616 | break; | |
1617 | case 1: | |
1618 | sprintf(fmtstr, "%%2.2l%c ", fmtchar); | |
1619 | break; | |
1620 | default: | |
1621 | return KDB_BADWIDTH; | |
1622 | } | |
1623 | ||
1624 | last_repeat = repeat; | |
1625 | last_bytesperword = bytesperword; | |
1626 | ||
1627 | if (strcmp(argv[0], "mds") == 0) { | |
1628 | symbolic = 1; | |
1629 | /* Do not save these changes as last_*, they are temporary mds | |
1630 | * overrides. | |
1631 | */ | |
1632 | bytesperword = KDB_WORD_SIZE; | |
1633 | repeat = mdcount; | |
1634 | kdbgetintenv("NOSECT", &nosect); | |
1635 | } | |
1636 | ||
1637 | /* Round address down modulo BYTESPERWORD */ | |
1638 | ||
1639 | addr &= ~(bytesperword-1); | |
1640 | ||
1641 | while (repeat > 0) { | |
1642 | unsigned long a; | |
1643 | int n, z, num = (symbolic ? 1 : (16 / bytesperword)); | |
1644 | ||
1645 | if (KDB_FLAG(CMD_INTERRUPT)) | |
1646 | return 0; | |
1647 | for (a = addr, z = 0; z < repeat; a += bytesperword, ++z) { | |
1648 | if (phys) { | |
1649 | if (kdb_getphysword(&word, a, bytesperword) | |
1650 | || word) | |
1651 | break; | |
1652 | } else if (kdb_getword(&word, a, bytesperword) || word) | |
1653 | break; | |
1654 | } | |
1655 | n = min(num, repeat); | |
1656 | kdb_md_line(fmtstr, addr, symbolic, nosect, bytesperword, | |
1657 | num, repeat, phys); | |
1658 | addr += bytesperword * n; | |
1659 | repeat -= n; | |
1660 | z = (z + num - 1) / num; | |
1661 | if (z > 2) { | |
1662 | int s = num * (z-2); | |
1663 | kdb_printf(kdb_machreg_fmt0 "-" kdb_machreg_fmt0 | |
1664 | " zero suppressed\n", | |
1665 | addr, addr + bytesperword * s - 1); | |
1666 | addr += bytesperword * s; | |
1667 | repeat -= s; | |
1668 | } | |
1669 | } | |
1670 | last_addr = addr; | |
1671 | ||
1672 | return 0; | |
1673 | } | |
1674 | ||
1675 | /* | |
1676 | * kdb_mm - This function implements the 'mm' command. | |
1677 | * mm address-expression new-value | |
1678 | * Remarks: | |
1679 | * mm works on machine words, mmW works on bytes. | |
1680 | */ | |
1681 | static int kdb_mm(int argc, const char **argv) | |
1682 | { | |
1683 | int diag; | |
1684 | unsigned long addr; | |
1685 | long offset = 0; | |
1686 | unsigned long contents; | |
1687 | int nextarg; | |
1688 | int width; | |
1689 | ||
1690 | if (argv[0][2] && !isdigit(argv[0][2])) | |
1691 | return KDB_NOTFOUND; | |
1692 | ||
1693 | if (argc < 2) | |
1694 | return KDB_ARGCOUNT; | |
1695 | ||
1696 | nextarg = 1; | |
1697 | diag = kdbgetaddrarg(argc, argv, &nextarg, &addr, &offset, NULL); | |
1698 | if (diag) | |
1699 | return diag; | |
1700 | ||
1701 | if (nextarg > argc) | |
1702 | return KDB_ARGCOUNT; | |
1703 | diag = kdbgetaddrarg(argc, argv, &nextarg, &contents, NULL, NULL); | |
1704 | if (diag) | |
1705 | return diag; | |
1706 | ||
1707 | if (nextarg != argc + 1) | |
1708 | return KDB_ARGCOUNT; | |
1709 | ||
1710 | width = argv[0][2] ? (argv[0][2] - '0') : (KDB_WORD_SIZE); | |
1711 | diag = kdb_putword(addr, contents, width); | |
1712 | if (diag) | |
1713 | return diag; | |
1714 | ||
1715 | kdb_printf(kdb_machreg_fmt " = " kdb_machreg_fmt "\n", addr, contents); | |
1716 | ||
1717 | return 0; | |
1718 | } | |
1719 | ||
1720 | /* | |
1721 | * kdb_go - This function implements the 'go' command. | |
1722 | * go [address-expression] | |
1723 | */ | |
1724 | static int kdb_go(int argc, const char **argv) | |
1725 | { | |
1726 | unsigned long addr; | |
1727 | int diag; | |
1728 | int nextarg; | |
1729 | long offset; | |
1730 | ||
1731 | if (argc == 1) { | |
1732 | if (raw_smp_processor_id() != kdb_initial_cpu) { | |
1733 | kdb_printf("go <address> must be issued from the " | |
1734 | "initial cpu, do cpu %d first\n", | |
1735 | kdb_initial_cpu); | |
1736 | return KDB_ARGCOUNT; | |
1737 | } | |
1738 | nextarg = 1; | |
1739 | diag = kdbgetaddrarg(argc, argv, &nextarg, | |
1740 | &addr, &offset, NULL); | |
1741 | if (diag) | |
1742 | return diag; | |
1743 | } else if (argc) { | |
1744 | return KDB_ARGCOUNT; | |
1745 | } | |
1746 | ||
1747 | diag = KDB_CMD_GO; | |
1748 | if (KDB_FLAG(CATASTROPHIC)) { | |
1749 | kdb_printf("Catastrophic error detected\n"); | |
1750 | kdb_printf("kdb_continue_catastrophic=%d, ", | |
1751 | kdb_continue_catastrophic); | |
1752 | if (kdb_continue_catastrophic == 0 && kdb_go_count++ == 0) { | |
1753 | kdb_printf("type go a second time if you really want " | |
1754 | "to continue\n"); | |
1755 | return 0; | |
1756 | } | |
1757 | if (kdb_continue_catastrophic == 2) { | |
1758 | kdb_printf("forcing reboot\n"); | |
1759 | kdb_reboot(0, NULL); | |
1760 | } | |
1761 | kdb_printf("attempting to continue\n"); | |
1762 | } | |
1763 | return diag; | |
1764 | } | |
1765 | ||
1766 | /* | |
1767 | * kdb_rd - This function implements the 'rd' command. | |
1768 | */ | |
1769 | static int kdb_rd(int argc, const char **argv) | |
1770 | { | |
1771 | int diag = kdb_check_regs(); | |
1772 | if (diag) | |
1773 | return diag; | |
1774 | ||
1775 | kdb_dumpregs(kdb_current_regs); | |
1776 | return 0; | |
1777 | } | |
1778 | ||
1779 | /* | |
1780 | * kdb_rm - This function implements the 'rm' (register modify) command. | |
1781 | * rm register-name new-contents | |
1782 | * Remarks: | |
1783 | * Currently doesn't allow modification of control or | |
1784 | * debug registers. | |
1785 | */ | |
1786 | static int kdb_rm(int argc, const char **argv) | |
1787 | { | |
1788 | int diag; | |
1789 | int ind = 0; | |
1790 | unsigned long contents; | |
1791 | ||
1792 | if (argc != 2) | |
1793 | return KDB_ARGCOUNT; | |
1794 | /* | |
1795 | * Allow presence or absence of leading '%' symbol. | |
1796 | */ | |
1797 | if (argv[1][0] == '%') | |
1798 | ind = 1; | |
1799 | ||
1800 | diag = kdbgetularg(argv[2], &contents); | |
1801 | if (diag) | |
1802 | return diag; | |
1803 | ||
1804 | diag = kdb_check_regs(); | |
1805 | if (diag) | |
1806 | return diag; | |
1807 | kdb_printf("ERROR: Register set currently not implemented\n"); | |
1808 | return 0; | |
1809 | } | |
1810 | ||
1811 | #if defined(CONFIG_MAGIC_SYSRQ) | |
1812 | /* | |
1813 | * kdb_sr - This function implements the 'sr' (SYSRQ key) command | |
1814 | * which interfaces to the soi-disant MAGIC SYSRQ functionality. | |
1815 | * sr <magic-sysrq-code> | |
1816 | */ | |
1817 | static int kdb_sr(int argc, const char **argv) | |
1818 | { | |
1819 | if (argc != 1) | |
1820 | return KDB_ARGCOUNT; | |
1821 | sysrq_toggle_support(1); | |
1822 | handle_sysrq(*argv[1], NULL); | |
1823 | ||
1824 | return 0; | |
1825 | } | |
1826 | #endif /* CONFIG_MAGIC_SYSRQ */ | |
1827 | ||
1828 | /* | |
1829 | * kdb_ef - This function implements the 'regs' (display exception | |
1830 | * frame) command. This command takes an address and expects to | |
1831 | * find an exception frame at that address, formats and prints | |
1832 | * it. | |
1833 | * regs address-expression | |
1834 | * Remarks: | |
1835 | * Not done yet. | |
1836 | */ | |
1837 | static int kdb_ef(int argc, const char **argv) | |
1838 | { | |
1839 | int diag; | |
1840 | unsigned long addr; | |
1841 | long offset; | |
1842 | int nextarg; | |
1843 | ||
1844 | if (argc != 1) | |
1845 | return KDB_ARGCOUNT; | |
1846 | ||
1847 | nextarg = 1; | |
1848 | diag = kdbgetaddrarg(argc, argv, &nextarg, &addr, &offset, NULL); | |
1849 | if (diag) | |
1850 | return diag; | |
1851 | show_regs((struct pt_regs *)addr); | |
1852 | return 0; | |
1853 | } | |
1854 | ||
1855 | #if defined(CONFIG_MODULES) | |
1856 | /* modules using other modules */ | |
1857 | struct module_use { | |
1858 | struct list_head list; | |
1859 | struct module *module_which_uses; | |
1860 | }; | |
1861 | ||
1862 | /* | |
1863 | * kdb_lsmod - This function implements the 'lsmod' command. Lists | |
1864 | * currently loaded kernel modules. | |
1865 | * Mostly taken from userland lsmod. | |
1866 | */ | |
1867 | static int kdb_lsmod(int argc, const char **argv) | |
1868 | { | |
1869 | struct module *mod; | |
1870 | ||
1871 | if (argc != 0) | |
1872 | return KDB_ARGCOUNT; | |
1873 | ||
1874 | kdb_printf("Module Size modstruct Used by\n"); | |
1875 | list_for_each_entry(mod, kdb_modules, list) { | |
1876 | ||
1877 | kdb_printf("%-20s%8u 0x%p ", mod->name, | |
1878 | mod->core_size, (void *)mod); | |
1879 | #ifdef CONFIG_MODULE_UNLOAD | |
1880 | kdb_printf("%4d ", module_refcount(mod)); | |
1881 | #endif | |
1882 | if (mod->state == MODULE_STATE_GOING) | |
1883 | kdb_printf(" (Unloading)"); | |
1884 | else if (mod->state == MODULE_STATE_COMING) | |
1885 | kdb_printf(" (Loading)"); | |
1886 | else | |
1887 | kdb_printf(" (Live)"); | |
1888 | ||
1889 | #ifdef CONFIG_MODULE_UNLOAD | |
1890 | { | |
1891 | struct module_use *use; | |
1892 | kdb_printf(" [ "); | |
1893 | list_for_each_entry(use, &mod->modules_which_use_me, | |
1894 | list) | |
1895 | kdb_printf("%s ", use->module_which_uses->name); | |
1896 | kdb_printf("]\n"); | |
1897 | } | |
1898 | #endif | |
1899 | } | |
1900 | ||
1901 | return 0; | |
1902 | } | |
1903 | ||
1904 | #endif /* CONFIG_MODULES */ | |
1905 | ||
1906 | /* | |
1907 | * kdb_env - This function implements the 'env' command. Display the | |
1908 | * current environment variables. | |
1909 | */ | |
1910 | ||
1911 | static int kdb_env(int argc, const char **argv) | |
1912 | { | |
1913 | int i; | |
1914 | ||
1915 | for (i = 0; i < __nenv; i++) { | |
1916 | if (__env[i]) | |
1917 | kdb_printf("%s\n", __env[i]); | |
1918 | } | |
1919 | ||
1920 | if (KDB_DEBUG(MASK)) | |
1921 | kdb_printf("KDBFLAGS=0x%x\n", kdb_flags); | |
1922 | ||
1923 | return 0; | |
1924 | } | |
1925 | ||
1926 | #ifdef CONFIG_PRINTK | |
1927 | /* | |
1928 | * kdb_dmesg - This function implements the 'dmesg' command to display | |
1929 | * the contents of the syslog buffer. | |
1930 | * dmesg [lines] [adjust] | |
1931 | */ | |
1932 | static int kdb_dmesg(int argc, const char **argv) | |
1933 | { | |
1934 | char *syslog_data[4], *start, *end, c = '\0', *p; | |
1935 | int diag, logging, logsize, lines = 0, adjust = 0, n; | |
1936 | ||
1937 | if (argc > 2) | |
1938 | return KDB_ARGCOUNT; | |
1939 | if (argc) { | |
1940 | char *cp; | |
1941 | lines = simple_strtol(argv[1], &cp, 0); | |
1942 | if (*cp) | |
1943 | lines = 0; | |
1944 | if (argc > 1) { | |
1945 | adjust = simple_strtoul(argv[2], &cp, 0); | |
1946 | if (*cp || adjust < 0) | |
1947 | adjust = 0; | |
1948 | } | |
1949 | } | |
1950 | ||
1951 | /* disable LOGGING if set */ | |
1952 | diag = kdbgetintenv("LOGGING", &logging); | |
1953 | if (!diag && logging) { | |
1954 | const char *setargs[] = { "set", "LOGGING", "0" }; | |
1955 | kdb_set(2, setargs); | |
1956 | } | |
1957 | ||
1958 | /* syslog_data[0,1] physical start, end+1. syslog_data[2,3] | |
1959 | * logical start, end+1. */ | |
1960 | kdb_syslog_data(syslog_data); | |
1961 | if (syslog_data[2] == syslog_data[3]) | |
1962 | return 0; | |
1963 | logsize = syslog_data[1] - syslog_data[0]; | |
1964 | start = syslog_data[2]; | |
1965 | end = syslog_data[3]; | |
1966 | #define KDB_WRAP(p) (((p - syslog_data[0]) % logsize) + syslog_data[0]) | |
1967 | for (n = 0, p = start; p < end; ++p) { | |
1968 | c = *KDB_WRAP(p); | |
1969 | if (c == '\n') | |
1970 | ++n; | |
1971 | } | |
1972 | if (c != '\n') | |
1973 | ++n; | |
1974 | if (lines < 0) { | |
1975 | if (adjust >= n) | |
1976 | kdb_printf("buffer only contains %d lines, nothing " | |
1977 | "printed\n", n); | |
1978 | else if (adjust - lines >= n) | |
1979 | kdb_printf("buffer only contains %d lines, last %d " | |
1980 | "lines printed\n", n, n - adjust); | |
1981 | if (adjust) { | |
1982 | for (; start < end && adjust; ++start) { | |
1983 | if (*KDB_WRAP(start) == '\n') | |
1984 | --adjust; | |
1985 | } | |
1986 | if (start < end) | |
1987 | ++start; | |
1988 | } | |
1989 | for (p = start; p < end && lines; ++p) { | |
1990 | if (*KDB_WRAP(p) == '\n') | |
1991 | ++lines; | |
1992 | } | |
1993 | end = p; | |
1994 | } else if (lines > 0) { | |
1995 | int skip = n - (adjust + lines); | |
1996 | if (adjust >= n) { | |
1997 | kdb_printf("buffer only contains %d lines, " | |
1998 | "nothing printed\n", n); | |
1999 | skip = n; | |
2000 | } else if (skip < 0) { | |
2001 | lines += skip; | |
2002 | skip = 0; | |
2003 | kdb_printf("buffer only contains %d lines, first " | |
2004 | "%d lines printed\n", n, lines); | |
2005 | } | |
2006 | for (; start < end && skip; ++start) { | |
2007 | if (*KDB_WRAP(start) == '\n') | |
2008 | --skip; | |
2009 | } | |
2010 | for (p = start; p < end && lines; ++p) { | |
2011 | if (*KDB_WRAP(p) == '\n') | |
2012 | --lines; | |
2013 | } | |
2014 | end = p; | |
2015 | } | |
2016 | /* Do a line at a time (max 200 chars) to reduce protocol overhead */ | |
2017 | c = '\n'; | |
2018 | while (start != end) { | |
2019 | char buf[201]; | |
2020 | p = buf; | |
2021 | if (KDB_FLAG(CMD_INTERRUPT)) | |
2022 | return 0; | |
2023 | while (start < end && (c = *KDB_WRAP(start)) && | |
2024 | (p - buf) < sizeof(buf)-1) { | |
2025 | ++start; | |
2026 | *p++ = c; | |
2027 | if (c == '\n') | |
2028 | break; | |
2029 | } | |
2030 | *p = '\0'; | |
2031 | kdb_printf("%s", buf); | |
2032 | } | |
2033 | if (c != '\n') | |
2034 | kdb_printf("\n"); | |
2035 | ||
2036 | return 0; | |
2037 | } | |
2038 | #endif /* CONFIG_PRINTK */ | |
2039 | /* | |
2040 | * kdb_cpu - This function implements the 'cpu' command. | |
2041 | * cpu [<cpunum>] | |
2042 | * Returns: | |
2043 | * KDB_CMD_CPU for success, a kdb diagnostic if error | |
2044 | */ | |
2045 | static void kdb_cpu_status(void) | |
2046 | { | |
2047 | int i, start_cpu, first_print = 1; | |
2048 | char state, prev_state = '?'; | |
2049 | ||
2050 | kdb_printf("Currently on cpu %d\n", raw_smp_processor_id()); | |
2051 | kdb_printf("Available cpus: "); | |
2052 | for (start_cpu = -1, i = 0; i < NR_CPUS; i++) { | |
2053 | if (!cpu_online(i)) { | |
2054 | state = 'F'; /* cpu is offline */ | |
2055 | } else { | |
2056 | state = ' '; /* cpu is responding to kdb */ | |
2057 | if (kdb_task_state_char(KDB_TSK(i)) == 'I') | |
2058 | state = 'I'; /* idle task */ | |
2059 | } | |
2060 | if (state != prev_state) { | |
2061 | if (prev_state != '?') { | |
2062 | if (!first_print) | |
2063 | kdb_printf(", "); | |
2064 | first_print = 0; | |
2065 | kdb_printf("%d", start_cpu); | |
2066 | if (start_cpu < i-1) | |
2067 | kdb_printf("-%d", i-1); | |
2068 | if (prev_state != ' ') | |
2069 | kdb_printf("(%c)", prev_state); | |
2070 | } | |
2071 | prev_state = state; | |
2072 | start_cpu = i; | |
2073 | } | |
2074 | } | |
2075 | /* print the trailing cpus, ignoring them if they are all offline */ | |
2076 | if (prev_state != 'F') { | |
2077 | if (!first_print) | |
2078 | kdb_printf(", "); | |
2079 | kdb_printf("%d", start_cpu); | |
2080 | if (start_cpu < i-1) | |
2081 | kdb_printf("-%d", i-1); | |
2082 | if (prev_state != ' ') | |
2083 | kdb_printf("(%c)", prev_state); | |
2084 | } | |
2085 | kdb_printf("\n"); | |
2086 | } | |
2087 | ||
2088 | static int kdb_cpu(int argc, const char **argv) | |
2089 | { | |
2090 | unsigned long cpunum; | |
2091 | int diag; | |
2092 | ||
2093 | if (argc == 0) { | |
2094 | kdb_cpu_status(); | |
2095 | return 0; | |
2096 | } | |
2097 | ||
2098 | if (argc != 1) | |
2099 | return KDB_ARGCOUNT; | |
2100 | ||
2101 | diag = kdbgetularg(argv[1], &cpunum); | |
2102 | if (diag) | |
2103 | return diag; | |
2104 | ||
2105 | /* | |
2106 | * Validate cpunum | |
2107 | */ | |
2108 | if ((cpunum > NR_CPUS) || !cpu_online(cpunum)) | |
2109 | return KDB_BADCPUNUM; | |
2110 | ||
2111 | dbg_switch_cpu = cpunum; | |
2112 | ||
2113 | /* | |
2114 | * Switch to other cpu | |
2115 | */ | |
2116 | return KDB_CMD_CPU; | |
2117 | } | |
2118 | ||
2119 | /* The user may not realize that ps/bta with no parameters does not print idle | |
2120 | * or sleeping system daemon processes, so tell them how many were suppressed. | |
2121 | */ | |
2122 | void kdb_ps_suppressed(void) | |
2123 | { | |
2124 | int idle = 0, daemon = 0; | |
2125 | unsigned long mask_I = kdb_task_state_string("I"), | |
2126 | mask_M = kdb_task_state_string("M"); | |
2127 | unsigned long cpu; | |
2128 | const struct task_struct *p, *g; | |
2129 | for_each_online_cpu(cpu) { | |
2130 | p = kdb_curr_task(cpu); | |
2131 | if (kdb_task_state(p, mask_I)) | |
2132 | ++idle; | |
2133 | } | |
2134 | kdb_do_each_thread(g, p) { | |
2135 | if (kdb_task_state(p, mask_M)) | |
2136 | ++daemon; | |
2137 | } kdb_while_each_thread(g, p); | |
2138 | if (idle || daemon) { | |
2139 | if (idle) | |
2140 | kdb_printf("%d idle process%s (state I)%s\n", | |
2141 | idle, idle == 1 ? "" : "es", | |
2142 | daemon ? " and " : ""); | |
2143 | if (daemon) | |
2144 | kdb_printf("%d sleeping system daemon (state M) " | |
2145 | "process%s", daemon, | |
2146 | daemon == 1 ? "" : "es"); | |
2147 | kdb_printf(" suppressed,\nuse 'ps A' to see all.\n"); | |
2148 | } | |
2149 | } | |
2150 | ||
2151 | /* | |
2152 | * kdb_ps - This function implements the 'ps' command which shows a | |
2153 | * list of the active processes. | |
2154 | * ps [DRSTCZEUIMA] All processes, optionally filtered by state | |
2155 | */ | |
2156 | void kdb_ps1(const struct task_struct *p) | |
2157 | { | |
2158 | int cpu; | |
2159 | unsigned long tmp; | |
2160 | ||
2161 | if (!p || probe_kernel_read(&tmp, (char *)p, sizeof(unsigned long))) | |
2162 | return; | |
2163 | ||
2164 | cpu = kdb_process_cpu(p); | |
2165 | kdb_printf("0x%p %8d %8d %d %4d %c 0x%p %c%s\n", | |
2166 | (void *)p, p->pid, p->parent->pid, | |
2167 | kdb_task_has_cpu(p), kdb_process_cpu(p), | |
2168 | kdb_task_state_char(p), | |
2169 | (void *)(&p->thread), | |
2170 | p == kdb_curr_task(raw_smp_processor_id()) ? '*' : ' ', | |
2171 | p->comm); | |
2172 | if (kdb_task_has_cpu(p)) { | |
2173 | if (!KDB_TSK(cpu)) { | |
2174 | kdb_printf(" Error: no saved data for this cpu\n"); | |
2175 | } else { | |
2176 | if (KDB_TSK(cpu) != p) | |
2177 | kdb_printf(" Error: does not match running " | |
2178 | "process table (0x%p)\n", KDB_TSK(cpu)); | |
2179 | } | |
2180 | } | |
2181 | } | |
2182 | ||
2183 | static int kdb_ps(int argc, const char **argv) | |
2184 | { | |
2185 | struct task_struct *g, *p; | |
2186 | unsigned long mask, cpu; | |
2187 | ||
2188 | if (argc == 0) | |
2189 | kdb_ps_suppressed(); | |
2190 | kdb_printf("%-*s Pid Parent [*] cpu State %-*s Command\n", | |
2191 | (int)(2*sizeof(void *))+2, "Task Addr", | |
2192 | (int)(2*sizeof(void *))+2, "Thread"); | |
2193 | mask = kdb_task_state_string(argc ? argv[1] : NULL); | |
2194 | /* Run the active tasks first */ | |
2195 | for_each_online_cpu(cpu) { | |
2196 | if (KDB_FLAG(CMD_INTERRUPT)) | |
2197 | return 0; | |
2198 | p = kdb_curr_task(cpu); | |
2199 | if (kdb_task_state(p, mask)) | |
2200 | kdb_ps1(p); | |
2201 | } | |
2202 | kdb_printf("\n"); | |
2203 | /* Now the real tasks */ | |
2204 | kdb_do_each_thread(g, p) { | |
2205 | if (KDB_FLAG(CMD_INTERRUPT)) | |
2206 | return 0; | |
2207 | if (kdb_task_state(p, mask)) | |
2208 | kdb_ps1(p); | |
2209 | } kdb_while_each_thread(g, p); | |
2210 | ||
2211 | return 0; | |
2212 | } | |
2213 | ||
2214 | /* | |
2215 | * kdb_pid - This function implements the 'pid' command which switches | |
2216 | * the currently active process. | |
2217 | * pid [<pid> | R] | |
2218 | */ | |
2219 | static int kdb_pid(int argc, const char **argv) | |
2220 | { | |
2221 | struct task_struct *p; | |
2222 | unsigned long val; | |
2223 | int diag; | |
2224 | ||
2225 | if (argc > 1) | |
2226 | return KDB_ARGCOUNT; | |
2227 | ||
2228 | if (argc) { | |
2229 | if (strcmp(argv[1], "R") == 0) { | |
2230 | p = KDB_TSK(kdb_initial_cpu); | |
2231 | } else { | |
2232 | diag = kdbgetularg(argv[1], &val); | |
2233 | if (diag) | |
2234 | return KDB_BADINT; | |
2235 | ||
2236 | p = find_task_by_pid_ns((pid_t)val, &init_pid_ns); | |
2237 | if (!p) { | |
2238 | kdb_printf("No task with pid=%d\n", (pid_t)val); | |
2239 | return 0; | |
2240 | } | |
2241 | } | |
2242 | kdb_set_current_task(p); | |
2243 | } | |
2244 | kdb_printf("KDB current process is %s(pid=%d)\n", | |
2245 | kdb_current_task->comm, | |
2246 | kdb_current_task->pid); | |
2247 | ||
2248 | return 0; | |
2249 | } | |
2250 | ||
2251 | /* | |
2252 | * kdb_ll - This function implements the 'll' command which follows a | |
2253 | * linked list and executes an arbitrary command for each | |
2254 | * element. | |
2255 | */ | |
2256 | static int kdb_ll(int argc, const char **argv) | |
2257 | { | |
2258 | int diag; | |
2259 | unsigned long addr; | |
2260 | long offset = 0; | |
2261 | unsigned long va; | |
2262 | unsigned long linkoffset; | |
2263 | int nextarg; | |
2264 | const char *command; | |
2265 | ||
2266 | if (argc != 3) | |
2267 | return KDB_ARGCOUNT; | |
2268 | ||
2269 | nextarg = 1; | |
2270 | diag = kdbgetaddrarg(argc, argv, &nextarg, &addr, &offset, NULL); | |
2271 | if (diag) | |
2272 | return diag; | |
2273 | ||
2274 | diag = kdbgetularg(argv[2], &linkoffset); | |
2275 | if (diag) | |
2276 | return diag; | |
2277 | ||
2278 | /* | |
2279 | * Using the starting address as | |
2280 | * the first element in the list, and assuming that | |
2281 | * the list ends with a null pointer. | |
2282 | */ | |
2283 | ||
2284 | va = addr; | |
2285 | command = kdb_strdup(argv[3], GFP_KDB); | |
2286 | if (!command) { | |
2287 | kdb_printf("%s: cannot duplicate command\n", __func__); | |
2288 | return 0; | |
2289 | } | |
2290 | /* Recursive use of kdb_parse, do not use argv after this point */ | |
2291 | argv = NULL; | |
2292 | ||
2293 | while (va) { | |
2294 | char buf[80]; | |
2295 | ||
2296 | sprintf(buf, "%s " kdb_machreg_fmt "\n", command, va); | |
2297 | diag = kdb_parse(buf); | |
2298 | if (diag) | |
2299 | return diag; | |
2300 | ||
2301 | addr = va + linkoffset; | |
2302 | if (kdb_getword(&va, addr, sizeof(va))) | |
2303 | return 0; | |
2304 | } | |
2305 | kfree(command); | |
2306 | ||
2307 | return 0; | |
2308 | } | |
2309 | ||
2310 | static int kdb_kgdb(int argc, const char **argv) | |
2311 | { | |
2312 | return KDB_CMD_KGDB; | |
2313 | } | |
2314 | ||
2315 | /* | |
2316 | * kdb_help - This function implements the 'help' and '?' commands. | |
2317 | */ | |
2318 | static int kdb_help(int argc, const char **argv) | |
2319 | { | |
2320 | kdbtab_t *kt; | |
2321 | int i; | |
2322 | ||
2323 | kdb_printf("%-15.15s %-20.20s %s\n", "Command", "Usage", "Description"); | |
2324 | kdb_printf("-----------------------------" | |
2325 | "-----------------------------\n"); | |
2326 | for_each_kdbcmd(kt, i) { | |
2327 | if (kt->cmd_name) | |
2328 | kdb_printf("%-15.15s %-20.20s %s\n", kt->cmd_name, | |
2329 | kt->cmd_usage, kt->cmd_help); | |
2330 | if (KDB_FLAG(CMD_INTERRUPT)) | |
2331 | return 0; | |
2332 | } | |
2333 | return 0; | |
2334 | } | |
2335 | ||
2336 | /* | |
2337 | * kdb_kill - This function implements the 'kill' commands. | |
2338 | */ | |
2339 | static int kdb_kill(int argc, const char **argv) | |
2340 | { | |
2341 | long sig, pid; | |
2342 | char *endp; | |
2343 | struct task_struct *p; | |
2344 | struct siginfo info; | |
2345 | ||
2346 | if (argc != 2) | |
2347 | return KDB_ARGCOUNT; | |
2348 | ||
2349 | sig = simple_strtol(argv[1], &endp, 0); | |
2350 | if (*endp) | |
2351 | return KDB_BADINT; | |
2352 | if (sig >= 0) { | |
2353 | kdb_printf("Invalid signal parameter.<-signal>\n"); | |
2354 | return 0; | |
2355 | } | |
2356 | sig = -sig; | |
2357 | ||
2358 | pid = simple_strtol(argv[2], &endp, 0); | |
2359 | if (*endp) | |
2360 | return KDB_BADINT; | |
2361 | if (pid <= 0) { | |
2362 | kdb_printf("Process ID must be large than 0.\n"); | |
2363 | return 0; | |
2364 | } | |
2365 | ||
2366 | /* Find the process. */ | |
2367 | p = find_task_by_pid_ns(pid, &init_pid_ns); | |
2368 | if (!p) { | |
2369 | kdb_printf("The specified process isn't found.\n"); | |
2370 | return 0; | |
2371 | } | |
2372 | p = p->group_leader; | |
2373 | info.si_signo = sig; | |
2374 | info.si_errno = 0; | |
2375 | info.si_code = SI_USER; | |
2376 | info.si_pid = pid; /* same capabilities as process being signalled */ | |
2377 | info.si_uid = 0; /* kdb has root authority */ | |
2378 | kdb_send_sig_info(p, &info); | |
2379 | return 0; | |
2380 | } | |
2381 | ||
2382 | struct kdb_tm { | |
2383 | int tm_sec; /* seconds */ | |
2384 | int tm_min; /* minutes */ | |
2385 | int tm_hour; /* hours */ | |
2386 | int tm_mday; /* day of the month */ | |
2387 | int tm_mon; /* month */ | |
2388 | int tm_year; /* year */ | |
2389 | }; | |
2390 | ||
2391 | static void kdb_gmtime(struct timespec *tv, struct kdb_tm *tm) | |
2392 | { | |
2393 | /* This will work from 1970-2099, 2100 is not a leap year */ | |
2394 | static int mon_day[] = { 31, 29, 31, 30, 31, 30, 31, | |
2395 | 31, 30, 31, 30, 31 }; | |
2396 | memset(tm, 0, sizeof(*tm)); | |
2397 | tm->tm_sec = tv->tv_sec % (24 * 60 * 60); | |
2398 | tm->tm_mday = tv->tv_sec / (24 * 60 * 60) + | |
2399 | (2 * 365 + 1); /* shift base from 1970 to 1968 */ | |
2400 | tm->tm_min = tm->tm_sec / 60 % 60; | |
2401 | tm->tm_hour = tm->tm_sec / 60 / 60; | |
2402 | tm->tm_sec = tm->tm_sec % 60; | |
2403 | tm->tm_year = 68 + 4*(tm->tm_mday / (4*365+1)); | |
2404 | tm->tm_mday %= (4*365+1); | |
2405 | mon_day[1] = 29; | |
2406 | while (tm->tm_mday >= mon_day[tm->tm_mon]) { | |
2407 | tm->tm_mday -= mon_day[tm->tm_mon]; | |
2408 | if (++tm->tm_mon == 12) { | |
2409 | tm->tm_mon = 0; | |
2410 | ++tm->tm_year; | |
2411 | mon_day[1] = 28; | |
2412 | } | |
2413 | } | |
2414 | ++tm->tm_mday; | |
2415 | } | |
2416 | ||
2417 | /* | |
2418 | * Most of this code has been lifted from kernel/timer.c::sys_sysinfo(). | |
2419 | * I cannot call that code directly from kdb, it has an unconditional | |
2420 | * cli()/sti() and calls routines that take locks which can stop the debugger. | |
2421 | */ | |
2422 | static void kdb_sysinfo(struct sysinfo *val) | |
2423 | { | |
2424 | struct timespec uptime; | |
2425 | do_posix_clock_monotonic_gettime(&uptime); | |
2426 | memset(val, 0, sizeof(*val)); | |
2427 | val->uptime = uptime.tv_sec; | |
2428 | val->loads[0] = avenrun[0]; | |
2429 | val->loads[1] = avenrun[1]; | |
2430 | val->loads[2] = avenrun[2]; | |
2431 | val->procs = nr_threads-1; | |
2432 | si_meminfo(val); | |
2433 | ||
2434 | return; | |
2435 | } | |
2436 | ||
2437 | /* | |
2438 | * kdb_summary - This function implements the 'summary' command. | |
2439 | */ | |
2440 | static int kdb_summary(int argc, const char **argv) | |
2441 | { | |
2442 | struct kdb_tm tm; | |
2443 | struct sysinfo val; | |
2444 | ||
2445 | if (argc) | |
2446 | return KDB_ARGCOUNT; | |
2447 | ||
2448 | kdb_printf("sysname %s\n", init_uts_ns.name.sysname); | |
2449 | kdb_printf("release %s\n", init_uts_ns.name.release); | |
2450 | kdb_printf("version %s\n", init_uts_ns.name.version); | |
2451 | kdb_printf("machine %s\n", init_uts_ns.name.machine); | |
2452 | kdb_printf("nodename %s\n", init_uts_ns.name.nodename); | |
2453 | kdb_printf("domainname %s\n", init_uts_ns.name.domainname); | |
2454 | kdb_printf("ccversion %s\n", __stringify(CCVERSION)); | |
2455 | ||
2456 | kdb_gmtime(&xtime, &tm); | |
2457 | kdb_printf("date %04d-%02d-%02d %02d:%02d:%02d " | |
2458 | "tz_minuteswest %d\n", | |
2459 | 1900+tm.tm_year, tm.tm_mon+1, tm.tm_mday, | |
2460 | tm.tm_hour, tm.tm_min, tm.tm_sec, | |
2461 | sys_tz.tz_minuteswest); | |
2462 | ||
2463 | kdb_sysinfo(&val); | |
2464 | kdb_printf("uptime "); | |
2465 | if (val.uptime > (24*60*60)) { | |
2466 | int days = val.uptime / (24*60*60); | |
2467 | val.uptime %= (24*60*60); | |
2468 | kdb_printf("%d day%s ", days, days == 1 ? "" : "s"); | |
2469 | } | |
2470 | kdb_printf("%02ld:%02ld\n", val.uptime/(60*60), (val.uptime/60)%60); | |
2471 | ||
2472 | /* lifted from fs/proc/proc_misc.c::loadavg_read_proc() */ | |
2473 | ||
2474 | #define LOAD_INT(x) ((x) >> FSHIFT) | |
2475 | #define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1-1)) * 100) | |
2476 | kdb_printf("load avg %ld.%02ld %ld.%02ld %ld.%02ld\n", | |
2477 | LOAD_INT(val.loads[0]), LOAD_FRAC(val.loads[0]), | |
2478 | LOAD_INT(val.loads[1]), LOAD_FRAC(val.loads[1]), | |
2479 | LOAD_INT(val.loads[2]), LOAD_FRAC(val.loads[2])); | |
2480 | #undef LOAD_INT | |
2481 | #undef LOAD_FRAC | |
2482 | /* Display in kilobytes */ | |
2483 | #define K(x) ((x) << (PAGE_SHIFT - 10)) | |
2484 | kdb_printf("\nMemTotal: %8lu kB\nMemFree: %8lu kB\n" | |
2485 | "Buffers: %8lu kB\n", | |
2486 | val.totalram, val.freeram, val.bufferram); | |
2487 | return 0; | |
2488 | } | |
2489 | ||
2490 | /* | |
2491 | * kdb_per_cpu - This function implements the 'per_cpu' command. | |
2492 | */ | |
2493 | static int kdb_per_cpu(int argc, const char **argv) | |
2494 | { | |
2495 | char buf[256], fmtstr[64]; | |
2496 | kdb_symtab_t symtab; | |
2497 | cpumask_t suppress = CPU_MASK_NONE; | |
2498 | int cpu, diag; | |
2499 | unsigned long addr, val, bytesperword = 0, whichcpu = ~0UL; | |
2500 | ||
2501 | if (argc < 1 || argc > 3) | |
2502 | return KDB_ARGCOUNT; | |
2503 | ||
2504 | snprintf(buf, sizeof(buf), "per_cpu__%s", argv[1]); | |
2505 | if (!kdbgetsymval(buf, &symtab)) { | |
2506 | kdb_printf("%s is not a per_cpu variable\n", argv[1]); | |
2507 | return KDB_BADADDR; | |
2508 | } | |
2509 | if (argc >= 2) { | |
2510 | diag = kdbgetularg(argv[2], &bytesperword); | |
2511 | if (diag) | |
2512 | return diag; | |
2513 | } | |
2514 | if (!bytesperword) | |
2515 | bytesperword = KDB_WORD_SIZE; | |
2516 | else if (bytesperword > KDB_WORD_SIZE) | |
2517 | return KDB_BADWIDTH; | |
2518 | sprintf(fmtstr, "%%0%dlx ", (int)(2*bytesperword)); | |
2519 | if (argc >= 3) { | |
2520 | diag = kdbgetularg(argv[3], &whichcpu); | |
2521 | if (diag) | |
2522 | return diag; | |
2523 | if (!cpu_online(whichcpu)) { | |
2524 | kdb_printf("cpu %ld is not online\n", whichcpu); | |
2525 | return KDB_BADCPUNUM; | |
2526 | } | |
2527 | } | |
2528 | ||
2529 | /* Most architectures use __per_cpu_offset[cpu], some use | |
2530 | * __per_cpu_offset(cpu), smp has no __per_cpu_offset. | |
2531 | */ | |
2532 | #ifdef __per_cpu_offset | |
2533 | #define KDB_PCU(cpu) __per_cpu_offset(cpu) | |
2534 | #else | |
2535 | #ifdef CONFIG_SMP | |
2536 | #define KDB_PCU(cpu) __per_cpu_offset[cpu] | |
2537 | #else | |
2538 | #define KDB_PCU(cpu) 0 | |
2539 | #endif | |
2540 | #endif | |
2541 | ||
2542 | for_each_online_cpu(cpu) { | |
2543 | if (whichcpu != ~0UL && whichcpu != cpu) | |
2544 | continue; | |
2545 | addr = symtab.sym_start + KDB_PCU(cpu); | |
2546 | diag = kdb_getword(&val, addr, bytesperword); | |
2547 | if (diag) { | |
2548 | kdb_printf("%5d " kdb_bfd_vma_fmt0 " - unable to " | |
2549 | "read, diag=%d\n", cpu, addr, diag); | |
2550 | continue; | |
2551 | } | |
2552 | #ifdef CONFIG_SMP | |
2553 | if (!val) { | |
2554 | cpu_set(cpu, suppress); | |
2555 | continue; | |
2556 | } | |
2557 | #endif /* CONFIG_SMP */ | |
2558 | kdb_printf("%5d ", cpu); | |
2559 | kdb_md_line(fmtstr, addr, | |
2560 | bytesperword == KDB_WORD_SIZE, | |
2561 | 1, bytesperword, 1, 1, 0); | |
2562 | } | |
2563 | if (cpus_weight(suppress) == 0) | |
2564 | return 0; | |
2565 | kdb_printf("Zero suppressed cpu(s):"); | |
2566 | for (cpu = first_cpu(suppress); cpu < num_possible_cpus(); | |
2567 | cpu = next_cpu(cpu, suppress)) { | |
2568 | kdb_printf(" %d", cpu); | |
2569 | if (cpu == num_possible_cpus() - 1 || | |
2570 | next_cpu(cpu, suppress) != cpu + 1) | |
2571 | continue; | |
2572 | while (cpu < num_possible_cpus() && | |
2573 | next_cpu(cpu, suppress) == cpu + 1) | |
2574 | ++cpu; | |
2575 | kdb_printf("-%d", cpu); | |
2576 | } | |
2577 | kdb_printf("\n"); | |
2578 | ||
2579 | #undef KDB_PCU | |
2580 | ||
2581 | return 0; | |
2582 | } | |
2583 | ||
2584 | /* | |
2585 | * display help for the use of cmd | grep pattern | |
2586 | */ | |
2587 | static int kdb_grep_help(int argc, const char **argv) | |
2588 | { | |
2589 | kdb_printf("Usage of cmd args | grep pattern:\n"); | |
2590 | kdb_printf(" Any command's output may be filtered through an "); | |
2591 | kdb_printf("emulated 'pipe'.\n"); | |
2592 | kdb_printf(" 'grep' is just a key word.\n"); | |
2593 | kdb_printf(" The pattern may include a very limited set of " | |
2594 | "metacharacters:\n"); | |
2595 | kdb_printf(" pattern or ^pattern or pattern$ or ^pattern$\n"); | |
2596 | kdb_printf(" And if there are spaces in the pattern, you may " | |
2597 | "quote it:\n"); | |
2598 | kdb_printf(" \"pat tern\" or \"^pat tern\" or \"pat tern$\"" | |
2599 | " or \"^pat tern$\"\n"); | |
2600 | return 0; | |
2601 | } | |
2602 | ||
2603 | /* | |
2604 | * kdb_register_repeat - This function is used to register a kernel | |
2605 | * debugger command. | |
2606 | * Inputs: | |
2607 | * cmd Command name | |
2608 | * func Function to execute the command | |
2609 | * usage A simple usage string showing arguments | |
2610 | * help A simple help string describing command | |
2611 | * repeat Does the command auto repeat on enter? | |
2612 | * Returns: | |
2613 | * zero for success, one if a duplicate command. | |
2614 | */ | |
2615 | #define kdb_command_extend 50 /* arbitrary */ | |
2616 | int kdb_register_repeat(char *cmd, | |
2617 | kdb_func_t func, | |
2618 | char *usage, | |
2619 | char *help, | |
2620 | short minlen, | |
2621 | kdb_repeat_t repeat) | |
2622 | { | |
2623 | int i; | |
2624 | kdbtab_t *kp; | |
2625 | ||
2626 | /* | |
2627 | * Brute force method to determine duplicates | |
2628 | */ | |
2629 | for_each_kdbcmd(kp, i) { | |
2630 | if (kp->cmd_name && (strcmp(kp->cmd_name, cmd) == 0)) { | |
2631 | kdb_printf("Duplicate kdb command registered: " | |
2632 | "%s, func %p help %s\n", cmd, func, help); | |
2633 | return 1; | |
2634 | } | |
2635 | } | |
2636 | ||
2637 | /* | |
2638 | * Insert command into first available location in table | |
2639 | */ | |
2640 | for_each_kdbcmd(kp, i) { | |
2641 | if (kp->cmd_name == NULL) | |
2642 | break; | |
2643 | } | |
2644 | ||
2645 | if (i >= kdb_max_commands) { | |
2646 | kdbtab_t *new = kmalloc((kdb_max_commands - KDB_BASE_CMD_MAX + | |
2647 | kdb_command_extend) * sizeof(*new), GFP_KDB); | |
2648 | if (!new) { | |
2649 | kdb_printf("Could not allocate new kdb_command " | |
2650 | "table\n"); | |
2651 | return 1; | |
2652 | } | |
2653 | if (kdb_commands) { | |
2654 | memcpy(new, kdb_commands, | |
2655 | kdb_max_commands * sizeof(*new)); | |
2656 | kfree(kdb_commands); | |
2657 | } | |
2658 | memset(new + kdb_max_commands, 0, | |
2659 | kdb_command_extend * sizeof(*new)); | |
2660 | kdb_commands = new; | |
2661 | kp = kdb_commands + kdb_max_commands; | |
2662 | kdb_max_commands += kdb_command_extend; | |
2663 | } | |
2664 | ||
2665 | kp->cmd_name = cmd; | |
2666 | kp->cmd_func = func; | |
2667 | kp->cmd_usage = usage; | |
2668 | kp->cmd_help = help; | |
2669 | kp->cmd_flags = 0; | |
2670 | kp->cmd_minlen = minlen; | |
2671 | kp->cmd_repeat = repeat; | |
2672 | ||
2673 | return 0; | |
2674 | } | |
2675 | ||
2676 | /* | |
2677 | * kdb_register - Compatibility register function for commands that do | |
2678 | * not need to specify a repeat state. Equivalent to | |
2679 | * kdb_register_repeat with KDB_REPEAT_NONE. | |
2680 | * Inputs: | |
2681 | * cmd Command name | |
2682 | * func Function to execute the command | |
2683 | * usage A simple usage string showing arguments | |
2684 | * help A simple help string describing command | |
2685 | * Returns: | |
2686 | * zero for success, one if a duplicate command. | |
2687 | */ | |
2688 | int kdb_register(char *cmd, | |
2689 | kdb_func_t func, | |
2690 | char *usage, | |
2691 | char *help, | |
2692 | short minlen) | |
2693 | { | |
2694 | return kdb_register_repeat(cmd, func, usage, help, minlen, | |
2695 | KDB_REPEAT_NONE); | |
2696 | } | |
2697 | ||
2698 | /* | |
2699 | * kdb_unregister - This function is used to unregister a kernel | |
2700 | * debugger command. It is generally called when a module which | |
2701 | * implements kdb commands is unloaded. | |
2702 | * Inputs: | |
2703 | * cmd Command name | |
2704 | * Returns: | |
2705 | * zero for success, one command not registered. | |
2706 | */ | |
2707 | int kdb_unregister(char *cmd) | |
2708 | { | |
2709 | int i; | |
2710 | kdbtab_t *kp; | |
2711 | ||
2712 | /* | |
2713 | * find the command. | |
2714 | */ | |
2715 | for (i = 0, kp = kdb_commands; i < kdb_max_commands; i++, kp++) { | |
2716 | if (kp->cmd_name && (strcmp(kp->cmd_name, cmd) == 0)) { | |
2717 | kp->cmd_name = NULL; | |
2718 | return 0; | |
2719 | } | |
2720 | } | |
2721 | ||
2722 | /* Couldn't find it. */ | |
2723 | return 1; | |
2724 | } | |
2725 | ||
2726 | /* Initialize the kdb command table. */ | |
2727 | static void __init kdb_inittab(void) | |
2728 | { | |
2729 | int i; | |
2730 | kdbtab_t *kp; | |
2731 | ||
2732 | for_each_kdbcmd(kp, i) | |
2733 | kp->cmd_name = NULL; | |
2734 | ||
2735 | kdb_register_repeat("md", kdb_md, "<vaddr>", | |
2736 | "Display Memory Contents, also mdWcN, e.g. md8c1", 1, | |
2737 | KDB_REPEAT_NO_ARGS); | |
2738 | kdb_register_repeat("mdr", kdb_md, "<vaddr> <bytes>", | |
2739 | "Display Raw Memory", 0, KDB_REPEAT_NO_ARGS); | |
2740 | kdb_register_repeat("mdp", kdb_md, "<paddr> <bytes>", | |
2741 | "Display Physical Memory", 0, KDB_REPEAT_NO_ARGS); | |
2742 | kdb_register_repeat("mds", kdb_md, "<vaddr>", | |
2743 | "Display Memory Symbolically", 0, KDB_REPEAT_NO_ARGS); | |
2744 | kdb_register_repeat("mm", kdb_mm, "<vaddr> <contents>", | |
2745 | "Modify Memory Contents", 0, KDB_REPEAT_NO_ARGS); | |
2746 | kdb_register_repeat("go", kdb_go, "[<vaddr>]", | |
2747 | "Continue Execution", 1, KDB_REPEAT_NONE); | |
2748 | kdb_register_repeat("rd", kdb_rd, "", | |
2749 | "Display Registers", 0, KDB_REPEAT_NONE); | |
2750 | kdb_register_repeat("rm", kdb_rm, "<reg> <contents>", | |
2751 | "Modify Registers", 0, KDB_REPEAT_NONE); | |
2752 | kdb_register_repeat("ef", kdb_ef, "<vaddr>", | |
2753 | "Display exception frame", 0, KDB_REPEAT_NONE); | |
2754 | kdb_register_repeat("bt", kdb_bt, "[<vaddr>]", | |
2755 | "Stack traceback", 1, KDB_REPEAT_NONE); | |
2756 | kdb_register_repeat("btp", kdb_bt, "<pid>", | |
2757 | "Display stack for process <pid>", 0, KDB_REPEAT_NONE); | |
2758 | kdb_register_repeat("bta", kdb_bt, "[DRSTCZEUIMA]", | |
2759 | "Display stack all processes", 0, KDB_REPEAT_NONE); | |
2760 | kdb_register_repeat("btc", kdb_bt, "", | |
2761 | "Backtrace current process on each cpu", 0, KDB_REPEAT_NONE); | |
2762 | kdb_register_repeat("btt", kdb_bt, "<vaddr>", | |
2763 | "Backtrace process given its struct task address", 0, | |
2764 | KDB_REPEAT_NONE); | |
2765 | kdb_register_repeat("ll", kdb_ll, "<first-element> <linkoffset> <cmd>", | |
2766 | "Execute cmd for each element in linked list", 0, KDB_REPEAT_NONE); | |
2767 | kdb_register_repeat("env", kdb_env, "", | |
2768 | "Show environment variables", 0, KDB_REPEAT_NONE); | |
2769 | kdb_register_repeat("set", kdb_set, "", | |
2770 | "Set environment variables", 0, KDB_REPEAT_NONE); | |
2771 | kdb_register_repeat("help", kdb_help, "", | |
2772 | "Display Help Message", 1, KDB_REPEAT_NONE); | |
2773 | kdb_register_repeat("?", kdb_help, "", | |
2774 | "Display Help Message", 0, KDB_REPEAT_NONE); | |
2775 | kdb_register_repeat("cpu", kdb_cpu, "<cpunum>", | |
2776 | "Switch to new cpu", 0, KDB_REPEAT_NONE); | |
2777 | kdb_register_repeat("kgdb", kdb_kgdb, "", | |
2778 | "Enter kgdb mode", 0, KDB_REPEAT_NONE); | |
2779 | kdb_register_repeat("ps", kdb_ps, "[<flags>|A]", | |
2780 | "Display active task list", 0, KDB_REPEAT_NONE); | |
2781 | kdb_register_repeat("pid", kdb_pid, "<pidnum>", | |
2782 | "Switch to another task", 0, KDB_REPEAT_NONE); | |
2783 | kdb_register_repeat("reboot", kdb_reboot, "", | |
2784 | "Reboot the machine immediately", 0, KDB_REPEAT_NONE); | |
2785 | #if defined(CONFIG_MODULES) | |
2786 | kdb_register_repeat("lsmod", kdb_lsmod, "", | |
2787 | "List loaded kernel modules", 0, KDB_REPEAT_NONE); | |
2788 | #endif | |
2789 | #if defined(CONFIG_MAGIC_SYSRQ) | |
2790 | kdb_register_repeat("sr", kdb_sr, "<key>", | |
2791 | "Magic SysRq key", 0, KDB_REPEAT_NONE); | |
2792 | #endif | |
2793 | #if defined(CONFIG_PRINTK) | |
2794 | kdb_register_repeat("dmesg", kdb_dmesg, "[lines]", | |
2795 | "Display syslog buffer", 0, KDB_REPEAT_NONE); | |
2796 | #endif | |
2797 | kdb_register_repeat("defcmd", kdb_defcmd, "name \"usage\" \"help\"", | |
2798 | "Define a set of commands, down to endefcmd", 0, KDB_REPEAT_NONE); | |
2799 | kdb_register_repeat("kill", kdb_kill, "<-signal> <pid>", | |
2800 | "Send a signal to a process", 0, KDB_REPEAT_NONE); | |
2801 | kdb_register_repeat("summary", kdb_summary, "", | |
2802 | "Summarize the system", 4, KDB_REPEAT_NONE); | |
2803 | kdb_register_repeat("per_cpu", kdb_per_cpu, "", | |
2804 | "Display per_cpu variables", 3, KDB_REPEAT_NONE); | |
2805 | kdb_register_repeat("grephelp", kdb_grep_help, "", | |
2806 | "Display help on | grep", 0, KDB_REPEAT_NONE); | |
2807 | } | |
2808 | ||
2809 | /* Execute any commands defined in kdb_cmds. */ | |
2810 | static void __init kdb_cmd_init(void) | |
2811 | { | |
2812 | int i, diag; | |
2813 | for (i = 0; kdb_cmds[i]; ++i) { | |
2814 | diag = kdb_parse(kdb_cmds[i]); | |
2815 | if (diag) | |
2816 | kdb_printf("kdb command %s failed, kdb diag %d\n", | |
2817 | kdb_cmds[i], diag); | |
2818 | } | |
2819 | if (defcmd_in_progress) { | |
2820 | kdb_printf("Incomplete 'defcmd' set, forcing endefcmd\n"); | |
2821 | kdb_parse("endefcmd"); | |
2822 | } | |
2823 | } | |
2824 | ||
2825 | /* Intialize kdb_printf, breakpoint tables and kdb state */ | |
2826 | void __init kdb_init(int lvl) | |
2827 | { | |
2828 | static int kdb_init_lvl = KDB_NOT_INITIALIZED; | |
2829 | int i; | |
2830 | ||
2831 | if (kdb_init_lvl == KDB_INIT_FULL || lvl <= kdb_init_lvl) | |
2832 | return; | |
2833 | for (i = kdb_init_lvl; i < lvl; i++) { | |
2834 | switch (i) { | |
2835 | case KDB_NOT_INITIALIZED: | |
2836 | kdb_inittab(); /* Initialize Command Table */ | |
2837 | kdb_initbptab(); /* Initialize Breakpoints */ | |
2838 | break; | |
2839 | case KDB_INIT_EARLY: | |
2840 | kdb_cmd_init(); /* Build kdb_cmds tables */ | |
2841 | break; | |
2842 | } | |
2843 | } | |
2844 | kdb_init_lvl = lvl; | |
2845 | } |