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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> | |
420c2b1b | 15 | #include <linux/types.h> |
5d5314d6 JW |
16 | #include <linux/string.h> |
17 | #include <linux/kernel.h> | |
bc792e61 | 18 | #include <linux/kmsg_dump.h> |
5d5314d6 JW |
19 | #include <linux/reboot.h> |
20 | #include <linux/sched.h> | |
4f17722c | 21 | #include <linux/sched/loadavg.h> |
03441a34 | 22 | #include <linux/sched/stat.h> |
b17b0153 | 23 | #include <linux/sched/debug.h> |
5d5314d6 JW |
24 | #include <linux/sysrq.h> |
25 | #include <linux/smp.h> | |
26 | #include <linux/utsname.h> | |
27 | #include <linux/vmalloc.h> | |
ad394f66 | 28 | #include <linux/atomic.h> |
5d5314d6 | 29 | #include <linux/module.h> |
420c2b1b | 30 | #include <linux/moduleparam.h> |
5d5314d6 JW |
31 | #include <linux/mm.h> |
32 | #include <linux/init.h> | |
33 | #include <linux/kallsyms.h> | |
34 | #include <linux/kgdb.h> | |
35 | #include <linux/kdb.h> | |
36 | #include <linux/notifier.h> | |
37 | #include <linux/interrupt.h> | |
38 | #include <linux/delay.h> | |
39 | #include <linux/nmi.h> | |
40 | #include <linux/time.h> | |
41 | #include <linux/ptrace.h> | |
42 | #include <linux/sysctl.h> | |
43 | #include <linux/cpu.h> | |
44 | #include <linux/kdebug.h> | |
45 | #include <linux/proc_fs.h> | |
46 | #include <linux/uaccess.h> | |
47 | #include <linux/slab.h> | |
eadb2f47 | 48 | #include <linux/security.h> |
5d5314d6 JW |
49 | #include "kdb_private.h" |
50 | ||
420c2b1b AV |
51 | #undef MODULE_PARAM_PREFIX |
52 | #define MODULE_PARAM_PREFIX "kdb." | |
53 | ||
b8017177 | 54 | static int kdb_cmd_enabled = CONFIG_KDB_DEFAULT_ENABLE; |
420c2b1b AV |
55 | module_param_named(cmd_enable, kdb_cmd_enabled, int, 0600); |
56 | ||
fb6daa75 | 57 | char kdb_grep_string[KDB_GREP_STRLEN]; |
5d5314d6 JW |
58 | int kdb_grepping_flag; |
59 | EXPORT_SYMBOL(kdb_grepping_flag); | |
60 | int kdb_grep_leading; | |
61 | int kdb_grep_trailing; | |
62 | ||
63 | /* | |
64 | * Kernel debugger state flags | |
65 | */ | |
c893de12 | 66 | unsigned int kdb_flags; |
5d5314d6 JW |
67 | |
68 | /* | |
69 | * kdb_lock protects updates to kdb_initial_cpu. Used to | |
70 | * single thread processors through the kernel debugger. | |
71 | */ | |
72 | int kdb_initial_cpu = -1; /* cpu number that owns kdb */ | |
73 | int kdb_nextline = 1; | |
74 | int kdb_state; /* General KDB state */ | |
75 | ||
76 | struct task_struct *kdb_current_task; | |
5d5314d6 JW |
77 | struct pt_regs *kdb_current_regs; |
78 | ||
79 | const char *kdb_diemsg; | |
80 | static int kdb_go_count; | |
81 | #ifdef CONFIG_KDB_CONTINUE_CATASTROPHIC | |
82 | static unsigned int kdb_continue_catastrophic = | |
83 | CONFIG_KDB_CONTINUE_CATASTROPHIC; | |
84 | #else | |
85 | static unsigned int kdb_continue_catastrophic; | |
86 | #endif | |
87 | ||
e4f291b3 SG |
88 | /* kdb_cmds_head describes the available commands. */ |
89 | static LIST_HEAD(kdb_cmds_head); | |
5d5314d6 JW |
90 | |
91 | typedef struct _kdbmsg { | |
92 | int km_diag; /* kdb diagnostic */ | |
93 | char *km_msg; /* Corresponding message text */ | |
94 | } kdbmsg_t; | |
95 | ||
96 | #define KDBMSG(msgnum, text) \ | |
97 | { KDB_##msgnum, text } | |
98 | ||
99 | static kdbmsg_t kdbmsgs[] = { | |
100 | KDBMSG(NOTFOUND, "Command Not Found"), | |
101 | KDBMSG(ARGCOUNT, "Improper argument count, see usage."), | |
102 | KDBMSG(BADWIDTH, "Illegal value for BYTESPERWORD use 1, 2, 4 or 8, " | |
103 | "8 is only allowed on 64 bit systems"), | |
104 | KDBMSG(BADRADIX, "Illegal value for RADIX use 8, 10 or 16"), | |
105 | KDBMSG(NOTENV, "Cannot find environment variable"), | |
106 | KDBMSG(NOENVVALUE, "Environment variable should have value"), | |
107 | KDBMSG(NOTIMP, "Command not implemented"), | |
108 | KDBMSG(ENVFULL, "Environment full"), | |
109 | KDBMSG(ENVBUFFULL, "Environment buffer full"), | |
110 | KDBMSG(TOOMANYBPT, "Too many breakpoints defined"), | |
111 | #ifdef CONFIG_CPU_XSCALE | |
112 | KDBMSG(TOOMANYDBREGS, "More breakpoints than ibcr registers defined"), | |
113 | #else | |
114 | KDBMSG(TOOMANYDBREGS, "More breakpoints than db registers defined"), | |
115 | #endif | |
116 | KDBMSG(DUPBPT, "Duplicate breakpoint address"), | |
117 | KDBMSG(BPTNOTFOUND, "Breakpoint not found"), | |
118 | KDBMSG(BADMODE, "Invalid IDMODE"), | |
119 | KDBMSG(BADINT, "Illegal numeric value"), | |
120 | KDBMSG(INVADDRFMT, "Invalid symbolic address format"), | |
121 | KDBMSG(BADREG, "Invalid register name"), | |
122 | KDBMSG(BADCPUNUM, "Invalid cpu number"), | |
123 | KDBMSG(BADLENGTH, "Invalid length field"), | |
124 | KDBMSG(NOBP, "No Breakpoint exists"), | |
125 | KDBMSG(BADADDR, "Invalid address"), | |
420c2b1b | 126 | KDBMSG(NOPERM, "Permission denied"), |
5d5314d6 JW |
127 | }; |
128 | #undef KDBMSG | |
129 | ||
5f784f79 | 130 | static const int __nkdb_err = ARRAY_SIZE(kdbmsgs); |
5d5314d6 JW |
131 | |
132 | ||
133 | /* | |
134 | * Initial environment. This is all kept static and local to | |
135 | * this file. We don't want to rely on the memory allocation | |
136 | * mechanisms in the kernel, so we use a very limited allocate-only | |
137 | * heap for new and altered environment variables. The entire | |
138 | * environment is limited to a fixed number of entries (add more | |
139 | * to __env[] if required) and a fixed amount of heap (add more to | |
140 | * KDB_ENVBUFSIZE if required). | |
141 | */ | |
142 | ||
83fa2d13 | 143 | static char *__env[31] = { |
5d5314d6 | 144 | #if defined(CONFIG_SMP) |
83fa2d13 | 145 | "PROMPT=[%d]kdb> ", |
5d5314d6 | 146 | #else |
83fa2d13 | 147 | "PROMPT=kdb> ", |
5d5314d6 | 148 | #endif |
83fa2d13 SG |
149 | "MOREPROMPT=more> ", |
150 | "RADIX=16", | |
151 | "MDCOUNT=8", /* lines of md output */ | |
152 | KDB_PLATFORM_ENV, | |
153 | "DTABCOUNT=30", | |
154 | "NOSECT=1", | |
5d5314d6 JW |
155 | }; |
156 | ||
5f784f79 | 157 | static const int __nenv = ARRAY_SIZE(__env); |
5d5314d6 JW |
158 | |
159 | struct task_struct *kdb_curr_task(int cpu) | |
160 | { | |
161 | struct task_struct *p = curr_task(cpu); | |
162 | #ifdef _TIF_MCA_INIT | |
163 | if ((task_thread_info(p)->flags & _TIF_MCA_INIT) && KDB_TSK(cpu)) | |
164 | p = krp->p; | |
165 | #endif | |
166 | return p; | |
167 | } | |
168 | ||
9452e977 | 169 | /* |
eadb2f47 DT |
170 | * Update the permissions flags (kdb_cmd_enabled) to match the |
171 | * current lockdown state. | |
172 | * | |
173 | * Within this function the calls to security_locked_down() are "lazy". We | |
174 | * avoid calling them if the current value of kdb_cmd_enabled already excludes | |
175 | * flags that might be subject to lockdown. Additionally we deliberately check | |
176 | * the lockdown flags independently (even though read lockdown implies write | |
177 | * lockdown) since that results in both simpler code and clearer messages to | |
178 | * the user on first-time debugger entry. | |
179 | * | |
180 | * The permission masks during a read+write lockdown permits the following | |
181 | * flags: INSPECT, SIGNAL, REBOOT (and ALWAYS_SAFE). | |
182 | * | |
183 | * The INSPECT commands are not blocked during lockdown because they are | |
184 | * not arbitrary memory reads. INSPECT covers the backtrace family (sometimes | |
185 | * forcing them to have no arguments) and lsmod. These commands do expose | |
186 | * some kernel state but do not allow the developer seated at the console to | |
187 | * choose what state is reported. SIGNAL and REBOOT should not be controversial, | |
188 | * given these are allowed for root during lockdown already. | |
189 | */ | |
190 | static void kdb_check_for_lockdown(void) | |
191 | { | |
192 | const int write_flags = KDB_ENABLE_MEM_WRITE | | |
193 | KDB_ENABLE_REG_WRITE | | |
194 | KDB_ENABLE_FLOW_CTRL; | |
195 | const int read_flags = KDB_ENABLE_MEM_READ | | |
196 | KDB_ENABLE_REG_READ; | |
197 | ||
198 | bool need_to_lockdown_write = false; | |
199 | bool need_to_lockdown_read = false; | |
200 | ||
201 | if (kdb_cmd_enabled & (KDB_ENABLE_ALL | write_flags)) | |
202 | need_to_lockdown_write = | |
203 | security_locked_down(LOCKDOWN_DBG_WRITE_KERNEL); | |
204 | ||
205 | if (kdb_cmd_enabled & (KDB_ENABLE_ALL | read_flags)) | |
206 | need_to_lockdown_read = | |
207 | security_locked_down(LOCKDOWN_DBG_READ_KERNEL); | |
208 | ||
209 | /* De-compose KDB_ENABLE_ALL if required */ | |
210 | if (need_to_lockdown_write || need_to_lockdown_read) | |
211 | if (kdb_cmd_enabled & KDB_ENABLE_ALL) | |
212 | kdb_cmd_enabled = KDB_ENABLE_MASK & ~KDB_ENABLE_ALL; | |
213 | ||
214 | if (need_to_lockdown_write) | |
215 | kdb_cmd_enabled &= ~write_flags; | |
216 | ||
217 | if (need_to_lockdown_read) | |
218 | kdb_cmd_enabled &= ~read_flags; | |
219 | } | |
220 | ||
221 | /* | |
222 | * Check whether the flags of the current command, the permissions of the kdb | |
223 | * console and the lockdown state allow a command to be run. | |
9452e977 | 224 | */ |
eadb2f47 | 225 | static bool kdb_check_flags(kdb_cmdflags_t flags, int permissions, |
9452e977 DT |
226 | bool no_args) |
227 | { | |
228 | /* permissions comes from userspace so needs massaging slightly */ | |
229 | permissions &= KDB_ENABLE_MASK; | |
230 | permissions |= KDB_ENABLE_ALWAYS_SAFE; | |
231 | ||
232 | /* some commands change group when launched with no arguments */ | |
233 | if (no_args) | |
234 | permissions |= permissions << KDB_ENABLE_NO_ARGS_SHIFT; | |
235 | ||
236 | flags |= KDB_ENABLE_ALL; | |
237 | ||
238 | return permissions & flags; | |
239 | } | |
240 | ||
5d5314d6 JW |
241 | /* |
242 | * kdbgetenv - This function will return the character string value of | |
243 | * an environment variable. | |
244 | * Parameters: | |
245 | * match A character string representing an environment variable. | |
246 | * Returns: | |
247 | * NULL No environment variable matches 'match' | |
248 | * char* Pointer to string value of environment variable. | |
249 | */ | |
250 | char *kdbgetenv(const char *match) | |
251 | { | |
252 | char **ep = __env; | |
253 | int matchlen = strlen(match); | |
254 | int i; | |
255 | ||
256 | for (i = 0; i < __nenv; i++) { | |
257 | char *e = *ep++; | |
258 | ||
259 | if (!e) | |
260 | continue; | |
261 | ||
262 | if ((strncmp(match, e, matchlen) == 0) | |
263 | && ((e[matchlen] == '\0') | |
264 | || (e[matchlen] == '='))) { | |
265 | char *cp = strchr(e, '='); | |
266 | return cp ? ++cp : ""; | |
267 | } | |
268 | } | |
269 | return NULL; | |
270 | } | |
271 | ||
272 | /* | |
273 | * kdballocenv - This function is used to allocate bytes for | |
274 | * environment entries. | |
275 | * Parameters: | |
276 | * match A character string representing a numeric value | |
277 | * Outputs: | |
278 | * *value the unsigned long representation of the env variable 'match' | |
279 | * Returns: | |
280 | * Zero on success, a kdb diagnostic on failure. | |
281 | * Remarks: | |
282 | * We use a static environment buffer (envbuffer) to hold the values | |
283 | * of dynamically generated environment variables (see kdb_set). Buffer | |
284 | * space once allocated is never free'd, so over time, the amount of space | |
285 | * (currently 512 bytes) will be exhausted if env variables are changed | |
286 | * frequently. | |
287 | */ | |
288 | static char *kdballocenv(size_t bytes) | |
289 | { | |
290 | #define KDB_ENVBUFSIZE 512 | |
291 | static char envbuffer[KDB_ENVBUFSIZE]; | |
292 | static int envbufsize; | |
293 | char *ep = NULL; | |
294 | ||
295 | if ((KDB_ENVBUFSIZE - envbufsize) >= bytes) { | |
296 | ep = &envbuffer[envbufsize]; | |
297 | envbufsize += bytes; | |
298 | } | |
299 | return ep; | |
300 | } | |
301 | ||
302 | /* | |
303 | * kdbgetulenv - This function will return the value of an unsigned | |
304 | * long-valued environment variable. | |
305 | * Parameters: | |
306 | * match A character string representing a numeric value | |
307 | * Outputs: | |
220a31b0 | 308 | * *value the unsigned long representation of the env variable 'match' |
5d5314d6 JW |
309 | * Returns: |
310 | * Zero on success, a kdb diagnostic on failure. | |
311 | */ | |
312 | static int kdbgetulenv(const char *match, unsigned long *value) | |
313 | { | |
314 | char *ep; | |
315 | ||
316 | ep = kdbgetenv(match); | |
317 | if (!ep) | |
318 | return KDB_NOTENV; | |
319 | if (strlen(ep) == 0) | |
320 | return KDB_NOENVVALUE; | |
321 | ||
322 | *value = simple_strtoul(ep, NULL, 0); | |
323 | ||
324 | return 0; | |
325 | } | |
326 | ||
327 | /* | |
328 | * kdbgetintenv - This function will return the value of an | |
329 | * integer-valued environment variable. | |
330 | * Parameters: | |
331 | * match A character string representing an integer-valued env variable | |
332 | * Outputs: | |
333 | * *value the integer representation of the environment variable 'match' | |
334 | * Returns: | |
335 | * Zero on success, a kdb diagnostic on failure. | |
336 | */ | |
337 | int kdbgetintenv(const char *match, int *value) | |
338 | { | |
339 | unsigned long val; | |
340 | int diag; | |
341 | ||
342 | diag = kdbgetulenv(match, &val); | |
343 | if (!diag) | |
344 | *value = (int) val; | |
345 | return diag; | |
346 | } | |
347 | ||
83fa2d13 SG |
348 | /* |
349 | * kdb_setenv() - Alter an existing environment variable or create a new one. | |
350 | * @var: Name of the variable | |
351 | * @val: Value of the variable | |
352 | * | |
353 | * Return: Zero on success, a kdb diagnostic on failure. | |
354 | */ | |
355 | static int kdb_setenv(const char *var, const char *val) | |
356 | { | |
357 | int i; | |
358 | char *ep; | |
359 | size_t varlen, vallen; | |
360 | ||
361 | varlen = strlen(var); | |
362 | vallen = strlen(val); | |
363 | ep = kdballocenv(varlen + vallen + 2); | |
364 | if (ep == (char *)0) | |
365 | return KDB_ENVBUFFULL; | |
366 | ||
367 | sprintf(ep, "%s=%s", var, val); | |
368 | ||
369 | for (i = 0; i < __nenv; i++) { | |
370 | if (__env[i] | |
371 | && ((strncmp(__env[i], var, varlen) == 0) | |
372 | && ((__env[i][varlen] == '\0') | |
373 | || (__env[i][varlen] == '=')))) { | |
374 | __env[i] = ep; | |
375 | return 0; | |
376 | } | |
377 | } | |
378 | ||
379 | /* | |
380 | * Wasn't existing variable. Fit into slot. | |
381 | */ | |
382 | for (i = 0; i < __nenv-1; i++) { | |
383 | if (__env[i] == (char *)0) { | |
384 | __env[i] = ep; | |
385 | return 0; | |
386 | } | |
387 | } | |
388 | ||
389 | return KDB_ENVFULL; | |
390 | } | |
391 | ||
392 | /* | |
393 | * kdb_printenv() - Display the current environment variables. | |
394 | */ | |
395 | static void kdb_printenv(void) | |
396 | { | |
397 | int i; | |
398 | ||
399 | for (i = 0; i < __nenv; i++) { | |
400 | if (__env[i]) | |
401 | kdb_printf("%s\n", __env[i]); | |
402 | } | |
403 | } | |
404 | ||
5d5314d6 JW |
405 | /* |
406 | * kdbgetularg - This function will convert a numeric string into an | |
407 | * unsigned long value. | |
408 | * Parameters: | |
409 | * arg A character string representing a numeric value | |
410 | * Outputs: | |
220a31b0 | 411 | * *value the unsigned long representation of arg. |
5d5314d6 JW |
412 | * Returns: |
413 | * Zero on success, a kdb diagnostic on failure. | |
414 | */ | |
415 | int kdbgetularg(const char *arg, unsigned long *value) | |
416 | { | |
417 | char *endp; | |
418 | unsigned long val; | |
419 | ||
420 | val = simple_strtoul(arg, &endp, 0); | |
421 | ||
422 | if (endp == arg) { | |
423 | /* | |
534af108 | 424 | * Also try base 16, for us folks too lazy to type the |
5d5314d6 JW |
425 | * leading 0x... |
426 | */ | |
427 | val = simple_strtoul(arg, &endp, 16); | |
428 | if (endp == arg) | |
429 | return KDB_BADINT; | |
430 | } | |
431 | ||
432 | *value = val; | |
433 | ||
434 | return 0; | |
435 | } | |
436 | ||
534af108 JW |
437 | int kdbgetu64arg(const char *arg, u64 *value) |
438 | { | |
439 | char *endp; | |
440 | u64 val; | |
441 | ||
442 | val = simple_strtoull(arg, &endp, 0); | |
443 | ||
444 | if (endp == arg) { | |
445 | ||
446 | val = simple_strtoull(arg, &endp, 16); | |
447 | if (endp == arg) | |
448 | return KDB_BADINT; | |
449 | } | |
450 | ||
451 | *value = val; | |
452 | ||
453 | return 0; | |
454 | } | |
455 | ||
5d5314d6 JW |
456 | /* |
457 | * kdb_set - This function implements the 'set' command. Alter an | |
458 | * existing environment variable or create a new one. | |
459 | */ | |
460 | int kdb_set(int argc, const char **argv) | |
461 | { | |
5d5314d6 JW |
462 | /* |
463 | * we can be invoked two ways: | |
464 | * set var=value argv[1]="var", argv[2]="value" | |
465 | * set var = value argv[1]="var", argv[2]="=", argv[3]="value" | |
466 | * - if the latter, shift 'em down. | |
467 | */ | |
468 | if (argc == 3) { | |
469 | argv[2] = argv[3]; | |
470 | argc--; | |
471 | } | |
472 | ||
473 | if (argc != 2) | |
474 | return KDB_ARGCOUNT; | |
475 | ||
ad99b510 DT |
476 | /* |
477 | * Censor sensitive variables | |
478 | */ | |
479 | if (strcmp(argv[1], "PROMPT") == 0 && | |
480 | !kdb_check_flags(KDB_ENABLE_MEM_READ, kdb_cmd_enabled, false)) | |
481 | return KDB_NOPERM; | |
482 | ||
5d5314d6 JW |
483 | /* |
484 | * Check for internal variables | |
485 | */ | |
486 | if (strcmp(argv[1], "KDBDEBUG") == 0) { | |
487 | unsigned int debugflags; | |
488 | char *cp; | |
489 | ||
490 | debugflags = simple_strtoul(argv[2], &cp, 0); | |
491 | if (cp == argv[2] || debugflags & ~KDB_DEBUG_FLAG_MASK) { | |
492 | kdb_printf("kdb: illegal debug flags '%s'\n", | |
493 | argv[2]); | |
494 | return 0; | |
495 | } | |
c893de12 | 496 | kdb_flags = (kdb_flags & ~KDB_DEBUG(MASK)) |
5d5314d6 JW |
497 | | (debugflags << KDB_DEBUG_FLAG_SHIFT); |
498 | ||
499 | return 0; | |
500 | } | |
501 | ||
502 | /* | |
503 | * Tokenizer squashed the '=' sign. argv[1] is variable | |
504 | * name, argv[2] = value. | |
505 | */ | |
83fa2d13 | 506 | return kdb_setenv(argv[1], argv[2]); |
5d5314d6 JW |
507 | } |
508 | ||
509 | static int kdb_check_regs(void) | |
510 | { | |
511 | if (!kdb_current_regs) { | |
512 | kdb_printf("No current kdb registers." | |
513 | " You may need to select another task\n"); | |
514 | return KDB_BADREG; | |
515 | } | |
516 | return 0; | |
517 | } | |
518 | ||
519 | /* | |
520 | * kdbgetaddrarg - This function is responsible for parsing an | |
521 | * address-expression and returning the value of the expression, | |
522 | * symbol name, and offset to the caller. | |
523 | * | |
524 | * The argument may consist of a numeric value (decimal or | |
220a31b0 | 525 | * hexadecimal), a symbol name, a register name (preceded by the |
5d5314d6 | 526 | * percent sign), an environment variable with a numeric value |
25985edc | 527 | * (preceded by a dollar sign) or a simple arithmetic expression |
5d5314d6 JW |
528 | * consisting of a symbol name, +/-, and a numeric constant value |
529 | * (offset). | |
530 | * Parameters: | |
531 | * argc - count of arguments in argv | |
532 | * argv - argument vector | |
533 | * *nextarg - index to next unparsed argument in argv[] | |
534 | * regs - Register state at time of KDB entry | |
535 | * Outputs: | |
536 | * *value - receives the value of the address-expression | |
537 | * *offset - receives the offset specified, if any | |
538 | * *name - receives the symbol name, if any | |
539 | * *nextarg - index to next unparsed argument in argv[] | |
540 | * Returns: | |
541 | * zero is returned on success, a kdb diagnostic code is | |
542 | * returned on error. | |
543 | */ | |
544 | int kdbgetaddrarg(int argc, const char **argv, int *nextarg, | |
545 | unsigned long *value, long *offset, | |
546 | char **name) | |
547 | { | |
548 | unsigned long addr; | |
549 | unsigned long off = 0; | |
550 | int positive; | |
551 | int diag; | |
552 | int found = 0; | |
553 | char *symname; | |
554 | char symbol = '\0'; | |
555 | char *cp; | |
556 | kdb_symtab_t symtab; | |
557 | ||
420c2b1b AV |
558 | /* |
559 | * If the enable flags prohibit both arbitrary memory access | |
560 | * and flow control then there are no reasonable grounds to | |
561 | * provide symbol lookup. | |
562 | */ | |
563 | if (!kdb_check_flags(KDB_ENABLE_MEM_READ | KDB_ENABLE_FLOW_CTRL, | |
564 | kdb_cmd_enabled, false)) | |
565 | return KDB_NOPERM; | |
566 | ||
5d5314d6 JW |
567 | /* |
568 | * Process arguments which follow the following syntax: | |
569 | * | |
570 | * symbol | numeric-address [+/- numeric-offset] | |
571 | * %register | |
572 | * $environment-variable | |
573 | */ | |
574 | ||
575 | if (*nextarg > argc) | |
576 | return KDB_ARGCOUNT; | |
577 | ||
578 | symname = (char *)argv[*nextarg]; | |
579 | ||
580 | /* | |
581 | * If there is no whitespace between the symbol | |
582 | * or address and the '+' or '-' symbols, we | |
583 | * remember the character and replace it with a | |
584 | * null so the symbol/value can be properly parsed | |
585 | */ | |
586 | cp = strpbrk(symname, "+-"); | |
587 | if (cp != NULL) { | |
588 | symbol = *cp; | |
589 | *cp++ = '\0'; | |
590 | } | |
591 | ||
592 | if (symname[0] == '$') { | |
593 | diag = kdbgetulenv(&symname[1], &addr); | |
594 | if (diag) | |
595 | return diag; | |
596 | } else if (symname[0] == '%') { | |
fcf2736c DT |
597 | diag = kdb_check_regs(); |
598 | if (diag) | |
599 | return diag; | |
5d5314d6 JW |
600 | /* Implement register values with % at a later time as it is |
601 | * arch optional. | |
602 | */ | |
603 | return KDB_NOTIMP; | |
604 | } else { | |
605 | found = kdbgetsymval(symname, &symtab); | |
606 | if (found) { | |
607 | addr = symtab.sym_start; | |
608 | } else { | |
609 | diag = kdbgetularg(argv[*nextarg], &addr); | |
610 | if (diag) | |
611 | return diag; | |
612 | } | |
613 | } | |
614 | ||
615 | if (!found) | |
616 | found = kdbnearsym(addr, &symtab); | |
617 | ||
618 | (*nextarg)++; | |
619 | ||
620 | if (name) | |
621 | *name = symname; | |
622 | if (value) | |
623 | *value = addr; | |
624 | if (offset && name && *name) | |
625 | *offset = addr - symtab.sym_start; | |
626 | ||
627 | if ((*nextarg > argc) | |
628 | && (symbol == '\0')) | |
629 | return 0; | |
630 | ||
631 | /* | |
632 | * check for +/- and offset | |
633 | */ | |
634 | ||
635 | if (symbol == '\0') { | |
636 | if ((argv[*nextarg][0] != '+') | |
637 | && (argv[*nextarg][0] != '-')) { | |
638 | /* | |
639 | * Not our argument. Return. | |
640 | */ | |
641 | return 0; | |
642 | } else { | |
643 | positive = (argv[*nextarg][0] == '+'); | |
644 | (*nextarg)++; | |
645 | } | |
646 | } else | |
647 | positive = (symbol == '+'); | |
648 | ||
649 | /* | |
650 | * Now there must be an offset! | |
651 | */ | |
652 | if ((*nextarg > argc) | |
653 | && (symbol == '\0')) { | |
654 | return KDB_INVADDRFMT; | |
655 | } | |
656 | ||
657 | if (!symbol) { | |
658 | cp = (char *)argv[*nextarg]; | |
659 | (*nextarg)++; | |
660 | } | |
661 | ||
662 | diag = kdbgetularg(cp, &off); | |
663 | if (diag) | |
664 | return diag; | |
665 | ||
666 | if (!positive) | |
667 | off = -off; | |
668 | ||
669 | if (offset) | |
670 | *offset += off; | |
671 | ||
672 | if (value) | |
673 | *value += off; | |
674 | ||
675 | return 0; | |
676 | } | |
677 | ||
678 | static void kdb_cmderror(int diag) | |
679 | { | |
680 | int i; | |
681 | ||
682 | if (diag >= 0) { | |
683 | kdb_printf("no error detected (diagnostic is %d)\n", diag); | |
684 | return; | |
685 | } | |
686 | ||
687 | for (i = 0; i < __nkdb_err; i++) { | |
688 | if (kdbmsgs[i].km_diag == diag) { | |
689 | kdb_printf("diag: %d: %s\n", diag, kdbmsgs[i].km_msg); | |
690 | return; | |
691 | } | |
692 | } | |
693 | ||
694 | kdb_printf("Unknown diag %d\n", -diag); | |
695 | } | |
696 | ||
697 | /* | |
698 | * kdb_defcmd, kdb_defcmd2 - This function implements the 'defcmd' | |
699 | * command which defines one command as a set of other commands, | |
700 | * terminated by endefcmd. kdb_defcmd processes the initial | |
701 | * 'defcmd' command, kdb_defcmd2 is invoked from kdb_parse for | |
702 | * the following commands until 'endefcmd'. | |
703 | * Inputs: | |
704 | * argc argument count | |
705 | * argv argument vector | |
706 | * Returns: | |
707 | * zero for success, a kdb diagnostic if error | |
708 | */ | |
b39cded8 | 709 | struct kdb_macro { |
9a5db530 SG |
710 | kdbtab_t cmd; /* Macro command */ |
711 | struct list_head statements; /* Associated statement list */ | |
5d5314d6 | 712 | }; |
9a5db530 SG |
713 | |
714 | struct kdb_macro_statement { | |
715 | char *statement; /* Statement text */ | |
716 | struct list_head list_node; /* Statement list node */ | |
717 | }; | |
718 | ||
b39cded8 | 719 | static struct kdb_macro *kdb_macro; |
7faedcd4 | 720 | static bool defcmd_in_progress; |
5d5314d6 JW |
721 | |
722 | /* Forward references */ | |
723 | static int kdb_exec_defcmd(int argc, const char **argv); | |
724 | ||
725 | static int kdb_defcmd2(const char *cmdstr, const char *argv0) | |
726 | { | |
9a5db530 SG |
727 | struct kdb_macro_statement *kms; |
728 | ||
729 | if (!kdb_macro) | |
730 | return KDB_NOTIMP; | |
731 | ||
5d5314d6 | 732 | if (strcmp(argv0, "endefcmd") == 0) { |
7faedcd4 | 733 | defcmd_in_progress = false; |
9a5db530 SG |
734 | if (!list_empty(&kdb_macro->statements)) |
735 | kdb_register(&kdb_macro->cmd); | |
5d5314d6 JW |
736 | return 0; |
737 | } | |
9a5db530 SG |
738 | |
739 | kms = kmalloc(sizeof(*kms), GFP_KDB); | |
740 | if (!kms) { | |
741 | kdb_printf("Could not allocate new kdb macro command: %s\n", | |
5d5314d6 | 742 | cmdstr); |
5d5314d6 JW |
743 | return KDB_NOTIMP; |
744 | } | |
9a5db530 SG |
745 | |
746 | kms->statement = kdb_strdup(cmdstr, GFP_KDB); | |
747 | list_add_tail(&kms->list_node, &kdb_macro->statements); | |
748 | ||
5d5314d6 JW |
749 | return 0; |
750 | } | |
751 | ||
752 | static int kdb_defcmd(int argc, const char **argv) | |
753 | { | |
c25abcd6 SG |
754 | kdbtab_t *mp; |
755 | ||
5d5314d6 JW |
756 | if (defcmd_in_progress) { |
757 | kdb_printf("kdb: nested defcmd detected, assuming missing " | |
758 | "endefcmd\n"); | |
759 | kdb_defcmd2("endefcmd", "endefcmd"); | |
760 | } | |
761 | if (argc == 0) { | |
9a5db530 SG |
762 | kdbtab_t *kp; |
763 | struct kdb_macro *kmp; | |
764 | struct kdb_macro_statement *kms; | |
765 | ||
766 | list_for_each_entry(kp, &kdb_cmds_head, list_node) { | |
e868f0a3 | 767 | if (kp->func == kdb_exec_defcmd) { |
9a5db530 | 768 | kdb_printf("defcmd %s \"%s\" \"%s\"\n", |
e868f0a3 | 769 | kp->name, kp->usage, kp->help); |
9a5db530 SG |
770 | kmp = container_of(kp, struct kdb_macro, cmd); |
771 | list_for_each_entry(kms, &kmp->statements, | |
772 | list_node) | |
773 | kdb_printf("%s", kms->statement); | |
774 | kdb_printf("endefcmd\n"); | |
775 | } | |
5d5314d6 JW |
776 | } |
777 | return 0; | |
778 | } | |
779 | if (argc != 3) | |
780 | return KDB_ARGCOUNT; | |
a37372f6 JW |
781 | if (in_dbg_master()) { |
782 | kdb_printf("Command only available during kdb_init()\n"); | |
783 | return KDB_NOTIMP; | |
784 | } | |
9a5db530 | 785 | kdb_macro = kzalloc(sizeof(*kdb_macro), GFP_KDB); |
b39cded8 | 786 | if (!kdb_macro) |
4eb7a66d | 787 | goto fail_defcmd; |
c25abcd6 | 788 | |
9a5db530 | 789 | mp = &kdb_macro->cmd; |
e868f0a3 SG |
790 | mp->func = kdb_exec_defcmd; |
791 | mp->minlen = 0; | |
792 | mp->flags = KDB_ENABLE_ALWAYS_SAFE; | |
793 | mp->name = kdb_strdup(argv[1], GFP_KDB); | |
794 | if (!mp->name) | |
4eb7a66d | 795 | goto fail_name; |
e868f0a3 SG |
796 | mp->usage = kdb_strdup(argv[2], GFP_KDB); |
797 | if (!mp->usage) | |
4eb7a66d | 798 | goto fail_usage; |
e868f0a3 SG |
799 | mp->help = kdb_strdup(argv[3], GFP_KDB); |
800 | if (!mp->help) | |
4eb7a66d | 801 | goto fail_help; |
e868f0a3 SG |
802 | if (mp->usage[0] == '"') { |
803 | strcpy(mp->usage, argv[2]+1); | |
804 | mp->usage[strlen(mp->usage)-1] = '\0'; | |
5d5314d6 | 805 | } |
e868f0a3 SG |
806 | if (mp->help[0] == '"') { |
807 | strcpy(mp->help, argv[3]+1); | |
808 | mp->help[strlen(mp->help)-1] = '\0'; | |
5d5314d6 | 809 | } |
9a5db530 SG |
810 | |
811 | INIT_LIST_HEAD(&kdb_macro->statements); | |
7faedcd4 | 812 | defcmd_in_progress = true; |
5d5314d6 | 813 | return 0; |
4eb7a66d | 814 | fail_help: |
e868f0a3 | 815 | kfree(mp->usage); |
4eb7a66d | 816 | fail_usage: |
e868f0a3 | 817 | kfree(mp->name); |
4eb7a66d | 818 | fail_name: |
b39cded8 | 819 | kfree(kdb_macro); |
4eb7a66d | 820 | fail_defcmd: |
b39cded8 | 821 | kdb_printf("Could not allocate new kdb_macro entry for %s\n", argv[1]); |
4eb7a66d | 822 | return KDB_NOTIMP; |
5d5314d6 JW |
823 | } |
824 | ||
825 | /* | |
826 | * kdb_exec_defcmd - Execute the set of commands associated with this | |
827 | * defcmd name. | |
828 | * Inputs: | |
829 | * argc argument count | |
830 | * argv argument vector | |
831 | * Returns: | |
832 | * zero for success, a kdb diagnostic if error | |
833 | */ | |
834 | static int kdb_exec_defcmd(int argc, const char **argv) | |
835 | { | |
9a5db530 SG |
836 | int ret; |
837 | kdbtab_t *kp; | |
838 | struct kdb_macro *kmp; | |
839 | struct kdb_macro_statement *kms; | |
840 | ||
5d5314d6 JW |
841 | if (argc != 0) |
842 | return KDB_ARGCOUNT; | |
9a5db530 SG |
843 | |
844 | list_for_each_entry(kp, &kdb_cmds_head, list_node) { | |
e868f0a3 | 845 | if (strcmp(kp->name, argv[0]) == 0) |
5d5314d6 JW |
846 | break; |
847 | } | |
9a5db530 | 848 | if (list_entry_is_head(kp, &kdb_cmds_head, list_node)) { |
5d5314d6 JW |
849 | kdb_printf("kdb_exec_defcmd: could not find commands for %s\n", |
850 | argv[0]); | |
851 | return KDB_NOTIMP; | |
852 | } | |
9a5db530 SG |
853 | kmp = container_of(kp, struct kdb_macro, cmd); |
854 | list_for_each_entry(kms, &kmp->statements, list_node) { | |
855 | /* | |
856 | * Recursive use of kdb_parse, do not use argv after this point. | |
857 | */ | |
5d5314d6 | 858 | argv = NULL; |
e868f0a3 | 859 | kdb_printf("[%s]kdb> %s\n", kmp->cmd.name, kms->statement); |
9a5db530 | 860 | ret = kdb_parse(kms->statement); |
5d5314d6 JW |
861 | if (ret) |
862 | return ret; | |
863 | } | |
864 | return 0; | |
865 | } | |
866 | ||
867 | /* Command history */ | |
868 | #define KDB_CMD_HISTORY_COUNT 32 | |
869 | #define CMD_BUFLEN 200 /* kdb_printf: max printline | |
870 | * size == 256 */ | |
871 | static unsigned int cmd_head, cmd_tail; | |
872 | static unsigned int cmdptr; | |
873 | static char cmd_hist[KDB_CMD_HISTORY_COUNT][CMD_BUFLEN]; | |
874 | static char cmd_cur[CMD_BUFLEN]; | |
875 | ||
876 | /* | |
877 | * The "str" argument may point to something like | grep xyz | |
878 | */ | |
879 | static void parse_grep(const char *str) | |
880 | { | |
881 | int len; | |
882 | char *cp = (char *)str, *cp2; | |
883 | ||
884 | /* sanity check: we should have been called with the \ first */ | |
885 | if (*cp != '|') | |
886 | return; | |
887 | cp++; | |
888 | while (isspace(*cp)) | |
889 | cp++; | |
63571431 | 890 | if (!str_has_prefix(cp, "grep ")) { |
5d5314d6 JW |
891 | kdb_printf("invalid 'pipe', see grephelp\n"); |
892 | return; | |
893 | } | |
894 | cp += 5; | |
895 | while (isspace(*cp)) | |
896 | cp++; | |
897 | cp2 = strchr(cp, '\n'); | |
898 | if (cp2) | |
899 | *cp2 = '\0'; /* remove the trailing newline */ | |
900 | len = strlen(cp); | |
901 | if (len == 0) { | |
902 | kdb_printf("invalid 'pipe', see grephelp\n"); | |
903 | return; | |
904 | } | |
905 | /* now cp points to a nonzero length search string */ | |
906 | if (*cp == '"') { | |
907 | /* allow it be "x y z" by removing the "'s - there must | |
908 | be two of them */ | |
909 | cp++; | |
910 | cp2 = strchr(cp, '"'); | |
911 | if (!cp2) { | |
912 | kdb_printf("invalid quoted string, see grephelp\n"); | |
913 | return; | |
914 | } | |
915 | *cp2 = '\0'; /* end the string where the 2nd " was */ | |
916 | } | |
917 | kdb_grep_leading = 0; | |
918 | if (*cp == '^') { | |
919 | kdb_grep_leading = 1; | |
920 | cp++; | |
921 | } | |
922 | len = strlen(cp); | |
923 | kdb_grep_trailing = 0; | |
924 | if (*(cp+len-1) == '$') { | |
925 | kdb_grep_trailing = 1; | |
926 | *(cp+len-1) = '\0'; | |
927 | } | |
928 | len = strlen(cp); | |
929 | if (!len) | |
930 | return; | |
fb6daa75 | 931 | if (len >= KDB_GREP_STRLEN) { |
5d5314d6 JW |
932 | kdb_printf("search string too long\n"); |
933 | return; | |
934 | } | |
935 | strcpy(kdb_grep_string, cp); | |
936 | kdb_grepping_flag++; | |
937 | return; | |
938 | } | |
939 | ||
940 | /* | |
941 | * kdb_parse - Parse the command line, search the command table for a | |
942 | * matching command and invoke the command function. This | |
943 | * function may be called recursively, if it is, the second call | |
944 | * will overwrite argv and cbuf. It is the caller's | |
945 | * responsibility to save their argv if they recursively call | |
946 | * kdb_parse(). | |
947 | * Parameters: | |
948 | * cmdstr The input command line to be parsed. | |
949 | * regs The registers at the time kdb was entered. | |
950 | * Returns: | |
951 | * Zero for success, a kdb diagnostic if failure. | |
952 | * Remarks: | |
953 | * Limited to 20 tokens. | |
954 | * | |
955 | * Real rudimentary tokenization. Basically only whitespace | |
220a31b0 | 956 | * is considered a token delimiter (but special consideration |
5d5314d6 JW |
957 | * is taken of the '=' sign as used by the 'set' command). |
958 | * | |
959 | * The algorithm used to tokenize the input string relies on | |
960 | * there being at least one whitespace (or otherwise useless) | |
961 | * character between tokens as the character immediately following | |
962 | * the token is altered in-place to a null-byte to terminate the | |
963 | * token string. | |
964 | */ | |
965 | ||
966 | #define MAXARGC 20 | |
967 | ||
968 | int kdb_parse(const char *cmdstr) | |
969 | { | |
970 | static char *argv[MAXARGC]; | |
971 | static int argc; | |
972 | static char cbuf[CMD_BUFLEN+2]; | |
973 | char *cp; | |
974 | char *cpp, quoted; | |
975 | kdbtab_t *tp; | |
e4f291b3 | 976 | int escaped, ignore_errors = 0, check_grep = 0; |
5d5314d6 JW |
977 | |
978 | /* | |
979 | * First tokenize the command string. | |
980 | */ | |
981 | cp = (char *)cmdstr; | |
5d5314d6 JW |
982 | |
983 | if (KDB_FLAG(CMD_INTERRUPT)) { | |
984 | /* Previous command was interrupted, newline must not | |
985 | * repeat the command */ | |
986 | KDB_FLAG_CLEAR(CMD_INTERRUPT); | |
987 | KDB_STATE_SET(PAGER); | |
988 | argc = 0; /* no repeat */ | |
989 | } | |
990 | ||
991 | if (*cp != '\n' && *cp != '\0') { | |
992 | argc = 0; | |
993 | cpp = cbuf; | |
994 | while (*cp) { | |
995 | /* skip whitespace */ | |
996 | while (isspace(*cp)) | |
997 | cp++; | |
998 | if ((*cp == '\0') || (*cp == '\n') || | |
999 | (*cp == '#' && !defcmd_in_progress)) | |
1000 | break; | |
1001 | /* special case: check for | grep pattern */ | |
1002 | if (*cp == '|') { | |
1003 | check_grep++; | |
1004 | break; | |
1005 | } | |
1006 | if (cpp >= cbuf + CMD_BUFLEN) { | |
1007 | kdb_printf("kdb_parse: command buffer " | |
1008 | "overflow, command ignored\n%s\n", | |
1009 | cmdstr); | |
1010 | return KDB_NOTFOUND; | |
1011 | } | |
1012 | if (argc >= MAXARGC - 1) { | |
1013 | kdb_printf("kdb_parse: too many arguments, " | |
1014 | "command ignored\n%s\n", cmdstr); | |
1015 | return KDB_NOTFOUND; | |
1016 | } | |
1017 | argv[argc++] = cpp; | |
1018 | escaped = 0; | |
1019 | quoted = '\0'; | |
1020 | /* Copy to next unquoted and unescaped | |
1021 | * whitespace or '=' */ | |
1022 | while (*cp && *cp != '\n' && | |
1023 | (escaped || quoted || !isspace(*cp))) { | |
1024 | if (cpp >= cbuf + CMD_BUFLEN) | |
1025 | break; | |
1026 | if (escaped) { | |
1027 | escaped = 0; | |
1028 | *cpp++ = *cp++; | |
1029 | continue; | |
1030 | } | |
1031 | if (*cp == '\\') { | |
1032 | escaped = 1; | |
1033 | ++cp; | |
1034 | continue; | |
1035 | } | |
1036 | if (*cp == quoted) | |
1037 | quoted = '\0'; | |
1038 | else if (*cp == '\'' || *cp == '"') | |
1039 | quoted = *cp; | |
1040 | *cpp = *cp++; | |
1041 | if (*cpp == '=' && !quoted) | |
1042 | break; | |
1043 | ++cpp; | |
1044 | } | |
1045 | *cpp++ = '\0'; /* Squash a ws or '=' character */ | |
1046 | } | |
1047 | } | |
1048 | if (!argc) | |
1049 | return 0; | |
1050 | if (check_grep) | |
1051 | parse_grep(cp); | |
1052 | if (defcmd_in_progress) { | |
1053 | int result = kdb_defcmd2(cmdstr, argv[0]); | |
1054 | if (!defcmd_in_progress) { | |
1055 | argc = 0; /* avoid repeat on endefcmd */ | |
1056 | *(argv[0]) = '\0'; | |
1057 | } | |
1058 | return result; | |
1059 | } | |
1060 | if (argv[0][0] == '-' && argv[0][1] && | |
1061 | (argv[0][1] < '0' || argv[0][1] > '9')) { | |
1062 | ignore_errors = 1; | |
1063 | ++argv[0]; | |
1064 | } | |
1065 | ||
e4f291b3 SG |
1066 | list_for_each_entry(tp, &kdb_cmds_head, list_node) { |
1067 | /* | |
1068 | * If this command is allowed to be abbreviated, | |
1069 | * check to see if this is it. | |
1070 | */ | |
e868f0a3 SG |
1071 | if (tp->minlen && (strlen(argv[0]) <= tp->minlen) && |
1072 | (strncmp(argv[0], tp->name, tp->minlen) == 0)) | |
e4f291b3 | 1073 | break; |
5d5314d6 | 1074 | |
e868f0a3 | 1075 | if (strcmp(argv[0], tp->name) == 0) |
e4f291b3 | 1076 | break; |
5d5314d6 JW |
1077 | } |
1078 | ||
1079 | /* | |
1080 | * If we don't find a command by this name, see if the first | |
1081 | * few characters of this match any of the known commands. | |
1082 | * e.g., md1c20 should match md. | |
1083 | */ | |
e4f291b3 SG |
1084 | if (list_entry_is_head(tp, &kdb_cmds_head, list_node)) { |
1085 | list_for_each_entry(tp, &kdb_cmds_head, list_node) { | |
e868f0a3 | 1086 | if (strncmp(argv[0], tp->name, strlen(tp->name)) == 0) |
e4f291b3 | 1087 | break; |
5d5314d6 JW |
1088 | } |
1089 | } | |
1090 | ||
e4f291b3 | 1091 | if (!list_entry_is_head(tp, &kdb_cmds_head, list_node)) { |
5d5314d6 | 1092 | int result; |
420c2b1b | 1093 | |
e868f0a3 | 1094 | if (!kdb_check_flags(tp->flags, kdb_cmd_enabled, argc <= 1)) |
420c2b1b AV |
1095 | return KDB_NOPERM; |
1096 | ||
5d5314d6 | 1097 | KDB_STATE_SET(CMD); |
e868f0a3 | 1098 | result = (*tp->func)(argc-1, (const char **)argv); |
5d5314d6 JW |
1099 | if (result && ignore_errors && result > KDB_CMD_GO) |
1100 | result = 0; | |
1101 | KDB_STATE_CLEAR(CMD); | |
04bb171e | 1102 | |
e868f0a3 | 1103 | if (tp->flags & KDB_REPEAT_WITH_ARGS) |
04bb171e AV |
1104 | return result; |
1105 | ||
e868f0a3 | 1106 | argc = tp->flags & KDB_REPEAT_NO_ARGS ? 1 : 0; |
04bb171e AV |
1107 | if (argv[argc]) |
1108 | *(argv[argc]) = '\0'; | |
5d5314d6 JW |
1109 | return result; |
1110 | } | |
1111 | ||
1112 | /* | |
1113 | * If the input with which we were presented does not | |
1114 | * map to an existing command, attempt to parse it as an | |
1115 | * address argument and display the result. Useful for | |
1116 | * obtaining the address of a variable, or the nearest symbol | |
1117 | * to an address contained in a register. | |
1118 | */ | |
1119 | { | |
1120 | unsigned long value; | |
1121 | char *name = NULL; | |
1122 | long offset; | |
1123 | int nextarg = 0; | |
1124 | ||
1125 | if (kdbgetaddrarg(0, (const char **)argv, &nextarg, | |
1126 | &value, &offset, &name)) { | |
1127 | return KDB_NOTFOUND; | |
1128 | } | |
1129 | ||
1130 | kdb_printf("%s = ", argv[0]); | |
1131 | kdb_symbol_print(value, NULL, KDB_SP_DEFAULT); | |
1132 | kdb_printf("\n"); | |
1133 | return 0; | |
1134 | } | |
1135 | } | |
1136 | ||
1137 | ||
1138 | static int handle_ctrl_cmd(char *cmd) | |
1139 | { | |
1140 | #define CTRL_P 16 | |
1141 | #define CTRL_N 14 | |
1142 | ||
1143 | /* initial situation */ | |
1144 | if (cmd_head == cmd_tail) | |
1145 | return 0; | |
1146 | switch (*cmd) { | |
1147 | case CTRL_P: | |
1148 | if (cmdptr != cmd_tail) | |
1b310030 DA |
1149 | cmdptr = (cmdptr + KDB_CMD_HISTORY_COUNT - 1) % |
1150 | KDB_CMD_HISTORY_COUNT; | |
d228bee8 | 1151 | strscpy(cmd_cur, cmd_hist[cmdptr], CMD_BUFLEN); |
5d5314d6 JW |
1152 | return 1; |
1153 | case CTRL_N: | |
1154 | if (cmdptr != cmd_head) | |
1155 | cmdptr = (cmdptr+1) % KDB_CMD_HISTORY_COUNT; | |
d228bee8 | 1156 | strscpy(cmd_cur, cmd_hist[cmdptr], CMD_BUFLEN); |
5d5314d6 JW |
1157 | return 1; |
1158 | } | |
1159 | return 0; | |
1160 | } | |
1161 | ||
1162 | /* | |
1163 | * kdb_reboot - This function implements the 'reboot' command. Reboot | |
1164 | * the system immediately, or loop for ever on failure. | |
1165 | */ | |
1166 | static int kdb_reboot(int argc, const char **argv) | |
1167 | { | |
1168 | emergency_restart(); | |
1169 | kdb_printf("Hmm, kdb_reboot did not reboot, spinning here\n"); | |
1170 | while (1) | |
1171 | cpu_relax(); | |
1172 | /* NOTREACHED */ | |
1173 | return 0; | |
1174 | } | |
1175 | ||
1176 | static void kdb_dumpregs(struct pt_regs *regs) | |
1177 | { | |
1178 | int old_lvl = console_loglevel; | |
a8fe19eb | 1179 | console_loglevel = CONSOLE_LOGLEVEL_MOTORMOUTH; |
d37d39ae | 1180 | kdb_trap_printk++; |
5d5314d6 | 1181 | show_regs(regs); |
d37d39ae | 1182 | kdb_trap_printk--; |
5d5314d6 JW |
1183 | kdb_printf("\n"); |
1184 | console_loglevel = old_lvl; | |
1185 | } | |
1186 | ||
9441d5f6 | 1187 | static void kdb_set_current_task(struct task_struct *p) |
5d5314d6 JW |
1188 | { |
1189 | kdb_current_task = p; | |
1190 | ||
1191 | if (kdb_task_has_cpu(p)) { | |
1192 | kdb_current_regs = KDB_TSKREGS(kdb_process_cpu(p)); | |
1193 | return; | |
1194 | } | |
1195 | kdb_current_regs = NULL; | |
1196 | } | |
1197 | ||
b0f73bc7 RD |
1198 | static void drop_newline(char *buf) |
1199 | { | |
1200 | size_t len = strlen(buf); | |
1201 | ||
1202 | if (len == 0) | |
1203 | return; | |
1204 | if (*(buf + len - 1) == '\n') | |
1205 | *(buf + len - 1) = '\0'; | |
1206 | } | |
1207 | ||
5d5314d6 JW |
1208 | /* |
1209 | * kdb_local - The main code for kdb. This routine is invoked on a | |
1210 | * specific processor, it is not global. The main kdb() routine | |
1211 | * ensures that only one processor at a time is in this routine. | |
1212 | * This code is called with the real reason code on the first | |
1213 | * entry to a kdb session, thereafter it is called with reason | |
1214 | * SWITCH, even if the user goes back to the original cpu. | |
1215 | * Inputs: | |
1216 | * reason The reason KDB was invoked | |
1217 | * error The hardware-defined error code | |
1218 | * regs The exception frame at time of fault/breakpoint. | |
1219 | * db_result Result code from the break or debug point. | |
1220 | * Returns: | |
1221 | * 0 KDB was invoked for an event which it wasn't responsible | |
1222 | * 1 KDB handled the event for which it was invoked. | |
1223 | * KDB_CMD_GO User typed 'go'. | |
1224 | * KDB_CMD_CPU User switched to another cpu. | |
1225 | * KDB_CMD_SS Single step. | |
5d5314d6 JW |
1226 | */ |
1227 | static int kdb_local(kdb_reason_t reason, int error, struct pt_regs *regs, | |
1228 | kdb_dbtrap_t db_result) | |
1229 | { | |
1230 | char *cmdbuf; | |
1231 | int diag; | |
1232 | struct task_struct *kdb_current = | |
1233 | kdb_curr_task(raw_smp_processor_id()); | |
1234 | ||
1235 | KDB_DEBUG_STATE("kdb_local 1", reason); | |
eadb2f47 DT |
1236 | |
1237 | kdb_check_for_lockdown(); | |
1238 | ||
5d5314d6 JW |
1239 | kdb_go_count = 0; |
1240 | if (reason == KDB_REASON_DEBUG) { | |
1241 | /* special case below */ | |
1242 | } else { | |
568fb6f4 | 1243 | kdb_printf("\nEntering kdb (current=0x%px, pid %d) ", |
578bd4df | 1244 | kdb_current, kdb_current ? kdb_current->pid : 0); |
5d5314d6 JW |
1245 | #if defined(CONFIG_SMP) |
1246 | kdb_printf("on processor %d ", raw_smp_processor_id()); | |
1247 | #endif | |
1248 | } | |
1249 | ||
1250 | switch (reason) { | |
1251 | case KDB_REASON_DEBUG: | |
1252 | { | |
1253 | /* | |
1254 | * If re-entering kdb after a single step | |
1255 | * command, don't print the message. | |
1256 | */ | |
1257 | switch (db_result) { | |
1258 | case KDB_DB_BPT: | |
568fb6f4 | 1259 | kdb_printf("\nEntering kdb (0x%px, pid %d) ", |
5d5314d6 JW |
1260 | kdb_current, kdb_current->pid); |
1261 | #if defined(CONFIG_SMP) | |
1262 | kdb_printf("on processor %d ", raw_smp_processor_id()); | |
1263 | #endif | |
1264 | kdb_printf("due to Debug @ " kdb_machreg_fmt "\n", | |
1265 | instruction_pointer(regs)); | |
1266 | break; | |
5d5314d6 JW |
1267 | case KDB_DB_SS: |
1268 | break; | |
1269 | case KDB_DB_SSBPT: | |
1270 | KDB_DEBUG_STATE("kdb_local 4", reason); | |
1271 | return 1; /* kdba_db_trap did the work */ | |
1272 | default: | |
1273 | kdb_printf("kdb: Bad result from kdba_db_trap: %d\n", | |
1274 | db_result); | |
1275 | break; | |
1276 | } | |
1277 | ||
1278 | } | |
1279 | break; | |
1280 | case KDB_REASON_ENTER: | |
1281 | if (KDB_STATE(KEYBOARD)) | |
1282 | kdb_printf("due to Keyboard Entry\n"); | |
1283 | else | |
1284 | kdb_printf("due to KDB_ENTER()\n"); | |
1285 | break; | |
1286 | case KDB_REASON_KEYBOARD: | |
1287 | KDB_STATE_SET(KEYBOARD); | |
1288 | kdb_printf("due to Keyboard Entry\n"); | |
1289 | break; | |
1290 | case KDB_REASON_ENTER_SLAVE: | |
1291 | /* drop through, slaves only get released via cpu switch */ | |
1292 | case KDB_REASON_SWITCH: | |
1293 | kdb_printf("due to cpu switch\n"); | |
1294 | break; | |
1295 | case KDB_REASON_OOPS: | |
1296 | kdb_printf("Oops: %s\n", kdb_diemsg); | |
1297 | kdb_printf("due to oops @ " kdb_machreg_fmt "\n", | |
1298 | instruction_pointer(regs)); | |
1299 | kdb_dumpregs(regs); | |
1300 | break; | |
8daaa5f8 MT |
1301 | case KDB_REASON_SYSTEM_NMI: |
1302 | kdb_printf("due to System NonMaskable Interrupt\n"); | |
1303 | break; | |
5d5314d6 JW |
1304 | case KDB_REASON_NMI: |
1305 | kdb_printf("due to NonMaskable Interrupt @ " | |
1306 | kdb_machreg_fmt "\n", | |
1307 | instruction_pointer(regs)); | |
5d5314d6 JW |
1308 | break; |
1309 | case KDB_REASON_SSTEP: | |
1310 | case KDB_REASON_BREAK: | |
1311 | kdb_printf("due to %s @ " kdb_machreg_fmt "\n", | |
1312 | reason == KDB_REASON_BREAK ? | |
1313 | "Breakpoint" : "SS trap", instruction_pointer(regs)); | |
1314 | /* | |
1315 | * Determine if this breakpoint is one that we | |
1316 | * are interested in. | |
1317 | */ | |
1318 | if (db_result != KDB_DB_BPT) { | |
1319 | kdb_printf("kdb: error return from kdba_bp_trap: %d\n", | |
1320 | db_result); | |
1321 | KDB_DEBUG_STATE("kdb_local 6", reason); | |
1322 | return 0; /* Not for us, dismiss it */ | |
1323 | } | |
1324 | break; | |
1325 | case KDB_REASON_RECURSE: | |
1326 | kdb_printf("due to Recursion @ " kdb_machreg_fmt "\n", | |
1327 | instruction_pointer(regs)); | |
1328 | break; | |
1329 | default: | |
1330 | kdb_printf("kdb: unexpected reason code: %d\n", reason); | |
1331 | KDB_DEBUG_STATE("kdb_local 8", reason); | |
1332 | return 0; /* Not for us, dismiss it */ | |
1333 | } | |
1334 | ||
1335 | while (1) { | |
1336 | /* | |
1337 | * Initialize pager context. | |
1338 | */ | |
1339 | kdb_nextline = 1; | |
1340 | KDB_STATE_CLEAR(SUPPRESS); | |
ab08e464 | 1341 | kdb_grepping_flag = 0; |
fb6daa75 DT |
1342 | /* ensure the old search does not leak into '/' commands */ |
1343 | kdb_grep_string[0] = '\0'; | |
5d5314d6 JW |
1344 | |
1345 | cmdbuf = cmd_cur; | |
1346 | *cmdbuf = '\0'; | |
1347 | *(cmd_hist[cmd_head]) = '\0'; | |
1348 | ||
5d5314d6 | 1349 | do_full_getstr: |
ad99b510 | 1350 | /* PROMPT can only be set if we have MEM_READ permission. */ |
5d5314d6 JW |
1351 | snprintf(kdb_prompt_str, CMD_BUFLEN, kdbgetenv("PROMPT"), |
1352 | raw_smp_processor_id()); | |
5d5314d6 JW |
1353 | if (defcmd_in_progress) |
1354 | strncat(kdb_prompt_str, "[defcmd]", CMD_BUFLEN); | |
1355 | ||
1356 | /* | |
1357 | * Fetch command from keyboard | |
1358 | */ | |
1359 | cmdbuf = kdb_getstr(cmdbuf, CMD_BUFLEN, kdb_prompt_str); | |
1360 | if (*cmdbuf != '\n') { | |
1361 | if (*cmdbuf < 32) { | |
1362 | if (cmdptr == cmd_head) { | |
d228bee8 | 1363 | strscpy(cmd_hist[cmd_head], cmd_cur, |
5d5314d6 JW |
1364 | CMD_BUFLEN); |
1365 | *(cmd_hist[cmd_head] + | |
1366 | strlen(cmd_hist[cmd_head])-1) = '\0'; | |
1367 | } | |
1368 | if (!handle_ctrl_cmd(cmdbuf)) | |
1369 | *(cmd_cur+strlen(cmd_cur)-1) = '\0'; | |
1370 | cmdbuf = cmd_cur; | |
1371 | goto do_full_getstr; | |
1372 | } else { | |
d228bee8 | 1373 | strscpy(cmd_hist[cmd_head], cmd_cur, |
5d5314d6 JW |
1374 | CMD_BUFLEN); |
1375 | } | |
1376 | ||
1377 | cmd_head = (cmd_head+1) % KDB_CMD_HISTORY_COUNT; | |
1378 | if (cmd_head == cmd_tail) | |
1379 | cmd_tail = (cmd_tail+1) % KDB_CMD_HISTORY_COUNT; | |
1380 | } | |
1381 | ||
1382 | cmdptr = cmd_head; | |
1383 | diag = kdb_parse(cmdbuf); | |
1384 | if (diag == KDB_NOTFOUND) { | |
b0f73bc7 | 1385 | drop_newline(cmdbuf); |
5d5314d6 JW |
1386 | kdb_printf("Unknown kdb command: '%s'\n", cmdbuf); |
1387 | diag = 0; | |
1388 | } | |
1389 | if (diag == KDB_CMD_GO | |
1390 | || diag == KDB_CMD_CPU | |
1391 | || diag == KDB_CMD_SS | |
5d5314d6 JW |
1392 | || diag == KDB_CMD_KGDB) |
1393 | break; | |
1394 | ||
1395 | if (diag) | |
1396 | kdb_cmderror(diag); | |
1397 | } | |
1398 | KDB_DEBUG_STATE("kdb_local 9", diag); | |
1399 | return diag; | |
1400 | } | |
1401 | ||
1402 | ||
1403 | /* | |
1404 | * kdb_print_state - Print the state data for the current processor | |
1405 | * for debugging. | |
1406 | * Inputs: | |
1407 | * text Identifies the debug point | |
1408 | * value Any integer value to be printed, e.g. reason code. | |
1409 | */ | |
1410 | void kdb_print_state(const char *text, int value) | |
1411 | { | |
1412 | kdb_printf("state: %s cpu %d value %d initial %d state %x\n", | |
1413 | text, raw_smp_processor_id(), value, kdb_initial_cpu, | |
1414 | kdb_state); | |
1415 | } | |
1416 | ||
1417 | /* | |
1418 | * kdb_main_loop - After initial setup and assignment of the | |
1419 | * controlling cpu, all cpus are in this loop. One cpu is in | |
1420 | * control and will issue the kdb prompt, the others will spin | |
1421 | * until 'go' or cpu switch. | |
1422 | * | |
1423 | * To get a consistent view of the kernel stacks for all | |
1424 | * processes, this routine is invoked from the main kdb code via | |
1425 | * an architecture specific routine. kdba_main_loop is | |
1426 | * responsible for making the kernel stacks consistent for all | |
1427 | * processes, there should be no difference between a blocked | |
1428 | * process and a running process as far as kdb is concerned. | |
1429 | * Inputs: | |
1430 | * reason The reason KDB was invoked | |
1431 | * error The hardware-defined error code | |
1432 | * reason2 kdb's current reason code. | |
1433 | * Initially error but can change | |
25985edc | 1434 | * according to kdb state. |
5d5314d6 JW |
1435 | * db_result Result code from break or debug point. |
1436 | * regs The exception frame at time of fault/breakpoint. | |
1437 | * should always be valid. | |
1438 | * Returns: | |
1439 | * 0 KDB was invoked for an event which it wasn't responsible | |
1440 | * 1 KDB handled the event for which it was invoked. | |
1441 | */ | |
1442 | int kdb_main_loop(kdb_reason_t reason, kdb_reason_t reason2, int error, | |
1443 | kdb_dbtrap_t db_result, struct pt_regs *regs) | |
1444 | { | |
1445 | int result = 1; | |
1446 | /* Stay in kdb() until 'go', 'ss[b]' or an error */ | |
1447 | while (1) { | |
1448 | /* | |
1449 | * All processors except the one that is in control | |
1450 | * will spin here. | |
1451 | */ | |
1452 | KDB_DEBUG_STATE("kdb_main_loop 1", reason); | |
1453 | while (KDB_STATE(HOLD_CPU)) { | |
1454 | /* state KDB is turned off by kdb_cpu to see if the | |
1455 | * other cpus are still live, each cpu in this loop | |
1456 | * turns it back on. | |
1457 | */ | |
1458 | if (!KDB_STATE(KDB)) | |
1459 | KDB_STATE_SET(KDB); | |
1460 | } | |
1461 | ||
1462 | KDB_STATE_CLEAR(SUPPRESS); | |
1463 | KDB_DEBUG_STATE("kdb_main_loop 2", reason); | |
1464 | if (KDB_STATE(LEAVING)) | |
1465 | break; /* Another cpu said 'go' */ | |
1466 | /* Still using kdb, this processor is in control */ | |
1467 | result = kdb_local(reason2, error, regs, db_result); | |
1468 | KDB_DEBUG_STATE("kdb_main_loop 3", result); | |
1469 | ||
1470 | if (result == KDB_CMD_CPU) | |
1471 | break; | |
1472 | ||
1473 | if (result == KDB_CMD_SS) { | |
1474 | KDB_STATE_SET(DOING_SS); | |
1475 | break; | |
1476 | } | |
1477 | ||
5d5314d6 | 1478 | if (result == KDB_CMD_KGDB) { |
d613d828 | 1479 | if (!KDB_STATE(DOING_KGDB)) |
5d5314d6 JW |
1480 | kdb_printf("Entering please attach debugger " |
1481 | "or use $D#44+ or $3#33\n"); | |
1482 | break; | |
1483 | } | |
1484 | if (result && result != 1 && result != KDB_CMD_GO) | |
1485 | kdb_printf("\nUnexpected kdb_local return code %d\n", | |
1486 | result); | |
1487 | KDB_DEBUG_STATE("kdb_main_loop 4", reason); | |
1488 | break; | |
1489 | } | |
1490 | if (KDB_STATE(DOING_SS)) | |
1491 | KDB_STATE_CLEAR(SSBPT); | |
1492 | ||
8f30d411 AW |
1493 | /* Clean up any keyboard devices before leaving */ |
1494 | kdb_kbd_cleanup_state(); | |
1495 | ||
5d5314d6 JW |
1496 | return result; |
1497 | } | |
1498 | ||
1499 | /* | |
1500 | * kdb_mdr - This function implements the guts of the 'mdr', memory | |
1501 | * read command. | |
1502 | * mdr <addr arg>,<byte count> | |
1503 | * Inputs: | |
1504 | * addr Start address | |
1505 | * count Number of bytes | |
1506 | * Returns: | |
1507 | * Always 0. Any errors are detected and printed by kdb_getarea. | |
1508 | */ | |
1509 | static int kdb_mdr(unsigned long addr, unsigned int count) | |
1510 | { | |
1511 | unsigned char c; | |
1512 | while (count--) { | |
1513 | if (kdb_getarea(c, addr)) | |
1514 | return 0; | |
1515 | kdb_printf("%02x", c); | |
1516 | addr++; | |
1517 | } | |
1518 | kdb_printf("\n"); | |
1519 | return 0; | |
1520 | } | |
1521 | ||
1522 | /* | |
1523 | * kdb_md - This function implements the 'md', 'md1', 'md2', 'md4', | |
1524 | * 'md8' 'mdr' and 'mds' commands. | |
1525 | * | |
1526 | * md|mds [<addr arg> [<line count> [<radix>]]] | |
1527 | * mdWcN [<addr arg> [<line count> [<radix>]]] | |
1528 | * where W = is the width (1, 2, 4 or 8) and N is the count. | |
1529 | * for eg., md1c20 reads 20 bytes, 1 at a time. | |
1530 | * mdr <addr arg>,<byte count> | |
1531 | */ | |
1532 | static void kdb_md_line(const char *fmtstr, unsigned long addr, | |
1533 | int symbolic, int nosect, int bytesperword, | |
1534 | int num, int repeat, int phys) | |
1535 | { | |
1536 | /* print just one line of data */ | |
1537 | kdb_symtab_t symtab; | |
1538 | char cbuf[32]; | |
1539 | char *c = cbuf; | |
1540 | int i; | |
9eb62f0e | 1541 | int j; |
5d5314d6 JW |
1542 | unsigned long word; |
1543 | ||
1544 | memset(cbuf, '\0', sizeof(cbuf)); | |
1545 | if (phys) | |
1546 | kdb_printf("phys " kdb_machreg_fmt0 " ", addr); | |
1547 | else | |
1548 | kdb_printf(kdb_machreg_fmt0 " ", addr); | |
1549 | ||
1550 | for (i = 0; i < num && repeat--; i++) { | |
1551 | if (phys) { | |
1552 | if (kdb_getphysword(&word, addr, bytesperword)) | |
1553 | break; | |
1554 | } else if (kdb_getword(&word, addr, bytesperword)) | |
1555 | break; | |
1556 | kdb_printf(fmtstr, word); | |
1557 | if (symbolic) | |
1558 | kdbnearsym(word, &symtab); | |
1559 | else | |
1560 | memset(&symtab, 0, sizeof(symtab)); | |
1561 | if (symtab.sym_name) { | |
1562 | kdb_symbol_print(word, &symtab, 0); | |
1563 | if (!nosect) { | |
1564 | kdb_printf("\n"); | |
1565 | kdb_printf(" %s %s " | |
1566 | kdb_machreg_fmt " " | |
1567 | kdb_machreg_fmt " " | |
1568 | kdb_machreg_fmt, symtab.mod_name, | |
1569 | symtab.sec_name, symtab.sec_start, | |
1570 | symtab.sym_start, symtab.sym_end); | |
1571 | } | |
1572 | addr += bytesperword; | |
1573 | } else { | |
1574 | union { | |
1575 | u64 word; | |
1576 | unsigned char c[8]; | |
1577 | } wc; | |
1578 | unsigned char *cp; | |
1579 | #ifdef __BIG_ENDIAN | |
1580 | cp = wc.c + 8 - bytesperword; | |
1581 | #else | |
1582 | cp = wc.c; | |
1583 | #endif | |
1584 | wc.word = word; | |
1585 | #define printable_char(c) \ | |
1586 | ({unsigned char __c = c; isascii(__c) && isprint(__c) ? __c : '.'; }) | |
9eb62f0e | 1587 | for (j = 0; j < bytesperword; j++) |
5d5314d6 | 1588 | *c++ = printable_char(*cp++); |
9eb62f0e | 1589 | addr += bytesperword; |
5d5314d6 JW |
1590 | #undef printable_char |
1591 | } | |
1592 | } | |
1593 | kdb_printf("%*s %s\n", (int)((num-i)*(2*bytesperword + 1)+1), | |
1594 | " ", cbuf); | |
1595 | } | |
1596 | ||
1597 | static int kdb_md(int argc, const char **argv) | |
1598 | { | |
1599 | static unsigned long last_addr; | |
1600 | static int last_radix, last_bytesperword, last_repeat; | |
1601 | int radix = 16, mdcount = 8, bytesperword = KDB_WORD_SIZE, repeat; | |
1602 | int nosect = 0; | |
1603 | char fmtchar, fmtstr[64]; | |
1604 | unsigned long addr; | |
1605 | unsigned long word; | |
1606 | long offset = 0; | |
1607 | int symbolic = 0; | |
1608 | int valid = 0; | |
1609 | int phys = 0; | |
1e0ce03b | 1610 | int raw = 0; |
5d5314d6 JW |
1611 | |
1612 | kdbgetintenv("MDCOUNT", &mdcount); | |
1613 | kdbgetintenv("RADIX", &radix); | |
1614 | kdbgetintenv("BYTESPERWORD", &bytesperword); | |
1615 | ||
1616 | /* Assume 'md <addr>' and start with environment values */ | |
1617 | repeat = mdcount * 16 / bytesperword; | |
1618 | ||
1619 | if (strcmp(argv[0], "mdr") == 0) { | |
1e0ce03b RD |
1620 | if (argc == 2 || (argc == 0 && last_addr != 0)) |
1621 | valid = raw = 1; | |
1622 | else | |
5d5314d6 | 1623 | return KDB_ARGCOUNT; |
5d5314d6 JW |
1624 | } else if (isdigit(argv[0][2])) { |
1625 | bytesperword = (int)(argv[0][2] - '0'); | |
1626 | if (bytesperword == 0) { | |
1627 | bytesperword = last_bytesperword; | |
1628 | if (bytesperword == 0) | |
1629 | bytesperword = 4; | |
1630 | } | |
1631 | last_bytesperword = bytesperword; | |
1632 | repeat = mdcount * 16 / bytesperword; | |
1633 | if (!argv[0][3]) | |
1634 | valid = 1; | |
1635 | else if (argv[0][3] == 'c' && argv[0][4]) { | |
1636 | char *p; | |
1637 | repeat = simple_strtoul(argv[0] + 4, &p, 10); | |
1638 | mdcount = ((repeat * bytesperword) + 15) / 16; | |
1639 | valid = !*p; | |
1640 | } | |
1641 | last_repeat = repeat; | |
1642 | } else if (strcmp(argv[0], "md") == 0) | |
1643 | valid = 1; | |
1644 | else if (strcmp(argv[0], "mds") == 0) | |
1645 | valid = 1; | |
1646 | else if (strcmp(argv[0], "mdp") == 0) { | |
1647 | phys = valid = 1; | |
1648 | } | |
1649 | if (!valid) | |
1650 | return KDB_NOTFOUND; | |
1651 | ||
1652 | if (argc == 0) { | |
1653 | if (last_addr == 0) | |
1654 | return KDB_ARGCOUNT; | |
1655 | addr = last_addr; | |
1656 | radix = last_radix; | |
1657 | bytesperword = last_bytesperword; | |
1658 | repeat = last_repeat; | |
1e0ce03b RD |
1659 | if (raw) |
1660 | mdcount = repeat; | |
1661 | else | |
1662 | mdcount = ((repeat * bytesperword) + 15) / 16; | |
5d5314d6 JW |
1663 | } |
1664 | ||
1665 | if (argc) { | |
1666 | unsigned long val; | |
1667 | int diag, nextarg = 1; | |
1668 | diag = kdbgetaddrarg(argc, argv, &nextarg, &addr, | |
1669 | &offset, NULL); | |
1670 | if (diag) | |
1671 | return diag; | |
1672 | if (argc > nextarg+2) | |
1673 | return KDB_ARGCOUNT; | |
1674 | ||
1675 | if (argc >= nextarg) { | |
1676 | diag = kdbgetularg(argv[nextarg], &val); | |
1677 | if (!diag) { | |
1678 | mdcount = (int) val; | |
1e0ce03b RD |
1679 | if (raw) |
1680 | repeat = mdcount; | |
1681 | else | |
1682 | repeat = mdcount * 16 / bytesperword; | |
5d5314d6 JW |
1683 | } |
1684 | } | |
1685 | if (argc >= nextarg+1) { | |
1686 | diag = kdbgetularg(argv[nextarg+1], &val); | |
1687 | if (!diag) | |
1688 | radix = (int) val; | |
1689 | } | |
1690 | } | |
1691 | ||
1e0ce03b RD |
1692 | if (strcmp(argv[0], "mdr") == 0) { |
1693 | int ret; | |
1694 | last_addr = addr; | |
1695 | ret = kdb_mdr(addr, mdcount); | |
1696 | last_addr += mdcount; | |
1697 | last_repeat = mdcount; | |
1698 | last_bytesperword = bytesperword; // to make REPEAT happy | |
1699 | return ret; | |
1700 | } | |
5d5314d6 JW |
1701 | |
1702 | switch (radix) { | |
1703 | case 10: | |
1704 | fmtchar = 'd'; | |
1705 | break; | |
1706 | case 16: | |
1707 | fmtchar = 'x'; | |
1708 | break; | |
1709 | case 8: | |
1710 | fmtchar = 'o'; | |
1711 | break; | |
1712 | default: | |
1713 | return KDB_BADRADIX; | |
1714 | } | |
1715 | ||
1716 | last_radix = radix; | |
1717 | ||
1718 | if (bytesperword > KDB_WORD_SIZE) | |
1719 | return KDB_BADWIDTH; | |
1720 | ||
1721 | switch (bytesperword) { | |
1722 | case 8: | |
1723 | sprintf(fmtstr, "%%16.16l%c ", fmtchar); | |
1724 | break; | |
1725 | case 4: | |
1726 | sprintf(fmtstr, "%%8.8l%c ", fmtchar); | |
1727 | break; | |
1728 | case 2: | |
1729 | sprintf(fmtstr, "%%4.4l%c ", fmtchar); | |
1730 | break; | |
1731 | case 1: | |
1732 | sprintf(fmtstr, "%%2.2l%c ", fmtchar); | |
1733 | break; | |
1734 | default: | |
1735 | return KDB_BADWIDTH; | |
1736 | } | |
1737 | ||
1738 | last_repeat = repeat; | |
1739 | last_bytesperword = bytesperword; | |
1740 | ||
1741 | if (strcmp(argv[0], "mds") == 0) { | |
1742 | symbolic = 1; | |
1743 | /* Do not save these changes as last_*, they are temporary mds | |
1744 | * overrides. | |
1745 | */ | |
1746 | bytesperword = KDB_WORD_SIZE; | |
1747 | repeat = mdcount; | |
1748 | kdbgetintenv("NOSECT", &nosect); | |
1749 | } | |
1750 | ||
1751 | /* Round address down modulo BYTESPERWORD */ | |
1752 | ||
1753 | addr &= ~(bytesperword-1); | |
1754 | ||
1755 | while (repeat > 0) { | |
1756 | unsigned long a; | |
1757 | int n, z, num = (symbolic ? 1 : (16 / bytesperword)); | |
1758 | ||
1759 | if (KDB_FLAG(CMD_INTERRUPT)) | |
1760 | return 0; | |
1761 | for (a = addr, z = 0; z < repeat; a += bytesperword, ++z) { | |
1762 | if (phys) { | |
1763 | if (kdb_getphysword(&word, a, bytesperword) | |
1764 | || word) | |
1765 | break; | |
1766 | } else if (kdb_getword(&word, a, bytesperword) || word) | |
1767 | break; | |
1768 | } | |
1769 | n = min(num, repeat); | |
1770 | kdb_md_line(fmtstr, addr, symbolic, nosect, bytesperword, | |
1771 | num, repeat, phys); | |
1772 | addr += bytesperword * n; | |
1773 | repeat -= n; | |
1774 | z = (z + num - 1) / num; | |
1775 | if (z > 2) { | |
1776 | int s = num * (z-2); | |
1777 | kdb_printf(kdb_machreg_fmt0 "-" kdb_machreg_fmt0 | |
1778 | " zero suppressed\n", | |
1779 | addr, addr + bytesperword * s - 1); | |
1780 | addr += bytesperword * s; | |
1781 | repeat -= s; | |
1782 | } | |
1783 | } | |
1784 | last_addr = addr; | |
1785 | ||
1786 | return 0; | |
1787 | } | |
1788 | ||
1789 | /* | |
1790 | * kdb_mm - This function implements the 'mm' command. | |
1791 | * mm address-expression new-value | |
1792 | * Remarks: | |
1793 | * mm works on machine words, mmW works on bytes. | |
1794 | */ | |
1795 | static int kdb_mm(int argc, const char **argv) | |
1796 | { | |
1797 | int diag; | |
1798 | unsigned long addr; | |
1799 | long offset = 0; | |
1800 | unsigned long contents; | |
1801 | int nextarg; | |
1802 | int width; | |
1803 | ||
1804 | if (argv[0][2] && !isdigit(argv[0][2])) | |
1805 | return KDB_NOTFOUND; | |
1806 | ||
1807 | if (argc < 2) | |
1808 | return KDB_ARGCOUNT; | |
1809 | ||
1810 | nextarg = 1; | |
1811 | diag = kdbgetaddrarg(argc, argv, &nextarg, &addr, &offset, NULL); | |
1812 | if (diag) | |
1813 | return diag; | |
1814 | ||
1815 | if (nextarg > argc) | |
1816 | return KDB_ARGCOUNT; | |
1817 | diag = kdbgetaddrarg(argc, argv, &nextarg, &contents, NULL, NULL); | |
1818 | if (diag) | |
1819 | return diag; | |
1820 | ||
1821 | if (nextarg != argc + 1) | |
1822 | return KDB_ARGCOUNT; | |
1823 | ||
1824 | width = argv[0][2] ? (argv[0][2] - '0') : (KDB_WORD_SIZE); | |
1825 | diag = kdb_putword(addr, contents, width); | |
1826 | if (diag) | |
1827 | return diag; | |
1828 | ||
1829 | kdb_printf(kdb_machreg_fmt " = " kdb_machreg_fmt "\n", addr, contents); | |
1830 | ||
1831 | return 0; | |
1832 | } | |
1833 | ||
1834 | /* | |
1835 | * kdb_go - This function implements the 'go' command. | |
1836 | * go [address-expression] | |
1837 | */ | |
1838 | static int kdb_go(int argc, const char **argv) | |
1839 | { | |
1840 | unsigned long addr; | |
1841 | int diag; | |
1842 | int nextarg; | |
1843 | long offset; | |
1844 | ||
495363d3 JW |
1845 | if (raw_smp_processor_id() != kdb_initial_cpu) { |
1846 | kdb_printf("go must execute on the entry cpu, " | |
1847 | "please use \"cpu %d\" and then execute go\n", | |
1848 | kdb_initial_cpu); | |
1849 | return KDB_BADCPUNUM; | |
1850 | } | |
5d5314d6 | 1851 | if (argc == 1) { |
5d5314d6 JW |
1852 | nextarg = 1; |
1853 | diag = kdbgetaddrarg(argc, argv, &nextarg, | |
1854 | &addr, &offset, NULL); | |
1855 | if (diag) | |
1856 | return diag; | |
1857 | } else if (argc) { | |
1858 | return KDB_ARGCOUNT; | |
1859 | } | |
1860 | ||
1861 | diag = KDB_CMD_GO; | |
1862 | if (KDB_FLAG(CATASTROPHIC)) { | |
1863 | kdb_printf("Catastrophic error detected\n"); | |
1864 | kdb_printf("kdb_continue_catastrophic=%d, ", | |
1865 | kdb_continue_catastrophic); | |
1866 | if (kdb_continue_catastrophic == 0 && kdb_go_count++ == 0) { | |
1867 | kdb_printf("type go a second time if you really want " | |
1868 | "to continue\n"); | |
1869 | return 0; | |
1870 | } | |
1871 | if (kdb_continue_catastrophic == 2) { | |
1872 | kdb_printf("forcing reboot\n"); | |
1873 | kdb_reboot(0, NULL); | |
1874 | } | |
1875 | kdb_printf("attempting to continue\n"); | |
1876 | } | |
1877 | return diag; | |
1878 | } | |
1879 | ||
1880 | /* | |
1881 | * kdb_rd - This function implements the 'rd' command. | |
1882 | */ | |
1883 | static int kdb_rd(int argc, const char **argv) | |
1884 | { | |
fcf2736c DT |
1885 | int len = kdb_check_regs(); |
1886 | #if DBG_MAX_REG_NUM > 0 | |
534af108 JW |
1887 | int i; |
1888 | char *rname; | |
1889 | int rsize; | |
1890 | u64 reg64; | |
1891 | u32 reg32; | |
1892 | u16 reg16; | |
1893 | u8 reg8; | |
1894 | ||
fcf2736c DT |
1895 | if (len) |
1896 | return len; | |
534af108 JW |
1897 | |
1898 | for (i = 0; i < DBG_MAX_REG_NUM; i++) { | |
1899 | rsize = dbg_reg_def[i].size * 2; | |
1900 | if (rsize > 16) | |
1901 | rsize = 2; | |
1902 | if (len + strlen(dbg_reg_def[i].name) + 4 + rsize > 80) { | |
1903 | len = 0; | |
1904 | kdb_printf("\n"); | |
1905 | } | |
1906 | if (len) | |
1907 | len += kdb_printf(" "); | |
1908 | switch(dbg_reg_def[i].size * 8) { | |
1909 | case 8: | |
1910 | rname = dbg_get_reg(i, ®8, kdb_current_regs); | |
1911 | if (!rname) | |
1912 | break; | |
1913 | len += kdb_printf("%s: %02x", rname, reg8); | |
1914 | break; | |
1915 | case 16: | |
1916 | rname = dbg_get_reg(i, ®16, kdb_current_regs); | |
1917 | if (!rname) | |
1918 | break; | |
1919 | len += kdb_printf("%s: %04x", rname, reg16); | |
1920 | break; | |
1921 | case 32: | |
1922 | rname = dbg_get_reg(i, ®32, kdb_current_regs); | |
1923 | if (!rname) | |
1924 | break; | |
1925 | len += kdb_printf("%s: %08x", rname, reg32); | |
1926 | break; | |
1927 | case 64: | |
1928 | rname = dbg_get_reg(i, ®64, kdb_current_regs); | |
1929 | if (!rname) | |
1930 | break; | |
1931 | len += kdb_printf("%s: %016llx", rname, reg64); | |
1932 | break; | |
1933 | default: | |
1934 | len += kdb_printf("%s: ??", dbg_reg_def[i].name); | |
1935 | } | |
1936 | } | |
1937 | kdb_printf("\n"); | |
fcf2736c DT |
1938 | #else |
1939 | if (len) | |
1940 | return len; | |
5d5314d6 | 1941 | |
fcf2736c DT |
1942 | kdb_dumpregs(kdb_current_regs); |
1943 | #endif | |
5d5314d6 JW |
1944 | return 0; |
1945 | } | |
1946 | ||
1947 | /* | |
1948 | * kdb_rm - This function implements the 'rm' (register modify) command. | |
1949 | * rm register-name new-contents | |
1950 | * Remarks: | |
534af108 | 1951 | * Allows register modification with the same restrictions as gdb |
5d5314d6 JW |
1952 | */ |
1953 | static int kdb_rm(int argc, const char **argv) | |
1954 | { | |
534af108 | 1955 | #if DBG_MAX_REG_NUM > 0 |
5d5314d6 | 1956 | int diag; |
534af108 JW |
1957 | const char *rname; |
1958 | int i; | |
1959 | u64 reg64; | |
1960 | u32 reg32; | |
1961 | u16 reg16; | |
1962 | u8 reg8; | |
5d5314d6 JW |
1963 | |
1964 | if (argc != 2) | |
1965 | return KDB_ARGCOUNT; | |
1966 | /* | |
1967 | * Allow presence or absence of leading '%' symbol. | |
1968 | */ | |
534af108 JW |
1969 | rname = argv[1]; |
1970 | if (*rname == '%') | |
1971 | rname++; | |
5d5314d6 | 1972 | |
534af108 | 1973 | diag = kdbgetu64arg(argv[2], ®64); |
5d5314d6 JW |
1974 | if (diag) |
1975 | return diag; | |
1976 | ||
fcf2736c DT |
1977 | diag = kdb_check_regs(); |
1978 | if (diag) | |
1979 | return diag; | |
534af108 JW |
1980 | |
1981 | diag = KDB_BADREG; | |
1982 | for (i = 0; i < DBG_MAX_REG_NUM; i++) { | |
1983 | if (strcmp(rname, dbg_reg_def[i].name) == 0) { | |
1984 | diag = 0; | |
1985 | break; | |
1986 | } | |
1987 | } | |
1988 | if (!diag) { | |
1989 | switch(dbg_reg_def[i].size * 8) { | |
1990 | case 8: | |
1991 | reg8 = reg64; | |
1992 | dbg_set_reg(i, ®8, kdb_current_regs); | |
1993 | break; | |
1994 | case 16: | |
1995 | reg16 = reg64; | |
1996 | dbg_set_reg(i, ®16, kdb_current_regs); | |
1997 | break; | |
1998 | case 32: | |
1999 | reg32 = reg64; | |
2000 | dbg_set_reg(i, ®32, kdb_current_regs); | |
2001 | break; | |
2002 | case 64: | |
2003 | dbg_set_reg(i, ®64, kdb_current_regs); | |
2004 | break; | |
2005 | } | |
2006 | } | |
2007 | return diag; | |
2008 | #else | |
5d5314d6 | 2009 | kdb_printf("ERROR: Register set currently not implemented\n"); |
534af108 JW |
2010 | return 0; |
2011 | #endif | |
5d5314d6 JW |
2012 | } |
2013 | ||
2014 | #if defined(CONFIG_MAGIC_SYSRQ) | |
2015 | /* | |
2016 | * kdb_sr - This function implements the 'sr' (SYSRQ key) command | |
2017 | * which interfaces to the soi-disant MAGIC SYSRQ functionality. | |
2018 | * sr <magic-sysrq-code> | |
2019 | */ | |
2020 | static int kdb_sr(int argc, const char **argv) | |
2021 | { | |
420c2b1b AV |
2022 | bool check_mask = |
2023 | !kdb_check_flags(KDB_ENABLE_ALL, kdb_cmd_enabled, false); | |
2024 | ||
5d5314d6 JW |
2025 | if (argc != 1) |
2026 | return KDB_ARGCOUNT; | |
420c2b1b | 2027 | |
d37d39ae | 2028 | kdb_trap_printk++; |
420c2b1b | 2029 | __handle_sysrq(*argv[1], check_mask); |
d37d39ae | 2030 | kdb_trap_printk--; |
5d5314d6 JW |
2031 | |
2032 | return 0; | |
2033 | } | |
2034 | #endif /* CONFIG_MAGIC_SYSRQ */ | |
2035 | ||
2036 | /* | |
2037 | * kdb_ef - This function implements the 'regs' (display exception | |
2038 | * frame) command. This command takes an address and expects to | |
2039 | * find an exception frame at that address, formats and prints | |
2040 | * it. | |
2041 | * regs address-expression | |
2042 | * Remarks: | |
2043 | * Not done yet. | |
2044 | */ | |
2045 | static int kdb_ef(int argc, const char **argv) | |
2046 | { | |
2047 | int diag; | |
2048 | unsigned long addr; | |
2049 | long offset; | |
2050 | int nextarg; | |
2051 | ||
2052 | if (argc != 1) | |
2053 | return KDB_ARGCOUNT; | |
2054 | ||
2055 | nextarg = 1; | |
2056 | diag = kdbgetaddrarg(argc, argv, &nextarg, &addr, &offset, NULL); | |
2057 | if (diag) | |
2058 | return diag; | |
2059 | show_regs((struct pt_regs *)addr); | |
2060 | return 0; | |
2061 | } | |
2062 | ||
2063 | #if defined(CONFIG_MODULES) | |
5d5314d6 JW |
2064 | /* |
2065 | * kdb_lsmod - This function implements the 'lsmod' command. Lists | |
2066 | * currently loaded kernel modules. | |
2067 | * Mostly taken from userland lsmod. | |
2068 | */ | |
2069 | static int kdb_lsmod(int argc, const char **argv) | |
2070 | { | |
2071 | struct module *mod; | |
2072 | ||
2073 | if (argc != 0) | |
2074 | return KDB_ARGCOUNT; | |
2075 | ||
2076 | kdb_printf("Module Size modstruct Used by\n"); | |
2077 | list_for_each_entry(mod, kdb_modules, list) { | |
0d21b0e3 RR |
2078 | if (mod->state == MODULE_STATE_UNFORMED) |
2079 | continue; | |
5d5314d6 | 2080 | |
568fb6f4 | 2081 | kdb_printf("%-20s%8u 0x%px ", mod->name, |
7523e4dc | 2082 | mod->core_layout.size, (void *)mod); |
5d5314d6 | 2083 | #ifdef CONFIG_MODULE_UNLOAD |
d5db139a | 2084 | kdb_printf("%4d ", module_refcount(mod)); |
5d5314d6 JW |
2085 | #endif |
2086 | if (mod->state == MODULE_STATE_GOING) | |
2087 | kdb_printf(" (Unloading)"); | |
2088 | else if (mod->state == MODULE_STATE_COMING) | |
2089 | kdb_printf(" (Loading)"); | |
2090 | else | |
2091 | kdb_printf(" (Live)"); | |
568fb6f4 | 2092 | kdb_printf(" 0x%px", mod->core_layout.base); |
5d5314d6 JW |
2093 | |
2094 | #ifdef CONFIG_MODULE_UNLOAD | |
2095 | { | |
2096 | struct module_use *use; | |
2097 | kdb_printf(" [ "); | |
c8e21ced RR |
2098 | list_for_each_entry(use, &mod->source_list, |
2099 | source_list) | |
2100 | kdb_printf("%s ", use->target->name); | |
5d5314d6 JW |
2101 | kdb_printf("]\n"); |
2102 | } | |
2103 | #endif | |
2104 | } | |
2105 | ||
2106 | return 0; | |
2107 | } | |
2108 | ||
2109 | #endif /* CONFIG_MODULES */ | |
2110 | ||
2111 | /* | |
2112 | * kdb_env - This function implements the 'env' command. Display the | |
2113 | * current environment variables. | |
2114 | */ | |
2115 | ||
2116 | static int kdb_env(int argc, const char **argv) | |
2117 | { | |
83fa2d13 | 2118 | kdb_printenv(); |
5d5314d6 JW |
2119 | |
2120 | if (KDB_DEBUG(MASK)) | |
c893de12 WL |
2121 | kdb_printf("KDBDEBUG=0x%x\n", |
2122 | (kdb_flags & KDB_DEBUG(MASK)) >> KDB_DEBUG_FLAG_SHIFT); | |
5d5314d6 JW |
2123 | |
2124 | return 0; | |
2125 | } | |
2126 | ||
2127 | #ifdef CONFIG_PRINTK | |
2128 | /* | |
2129 | * kdb_dmesg - This function implements the 'dmesg' command to display | |
2130 | * the contents of the syslog buffer. | |
2131 | * dmesg [lines] [adjust] | |
2132 | */ | |
2133 | static int kdb_dmesg(int argc, const char **argv) | |
2134 | { | |
bc792e61 AV |
2135 | int diag; |
2136 | int logging; | |
2137 | int lines = 0; | |
2138 | int adjust = 0; | |
2139 | int n = 0; | |
2140 | int skip = 0; | |
f9f3f02d | 2141 | struct kmsg_dump_iter iter; |
bc792e61 AV |
2142 | size_t len; |
2143 | char buf[201]; | |
5d5314d6 JW |
2144 | |
2145 | if (argc > 2) | |
2146 | return KDB_ARGCOUNT; | |
2147 | if (argc) { | |
2148 | char *cp; | |
2149 | lines = simple_strtol(argv[1], &cp, 0); | |
2150 | if (*cp) | |
2151 | lines = 0; | |
2152 | if (argc > 1) { | |
2153 | adjust = simple_strtoul(argv[2], &cp, 0); | |
2154 | if (*cp || adjust < 0) | |
2155 | adjust = 0; | |
2156 | } | |
2157 | } | |
2158 | ||
2159 | /* disable LOGGING if set */ | |
2160 | diag = kdbgetintenv("LOGGING", &logging); | |
2161 | if (!diag && logging) { | |
2162 | const char *setargs[] = { "set", "LOGGING", "0" }; | |
2163 | kdb_set(2, setargs); | |
2164 | } | |
2165 | ||
a4f98765 JO |
2166 | kmsg_dump_rewind(&iter); |
2167 | while (kmsg_dump_get_line(&iter, 1, NULL, 0, NULL)) | |
bc792e61 AV |
2168 | n++; |
2169 | ||
5d5314d6 JW |
2170 | if (lines < 0) { |
2171 | if (adjust >= n) | |
2172 | kdb_printf("buffer only contains %d lines, nothing " | |
2173 | "printed\n", n); | |
2174 | else if (adjust - lines >= n) | |
2175 | kdb_printf("buffer only contains %d lines, last %d " | |
2176 | "lines printed\n", n, n - adjust); | |
bc792e61 AV |
2177 | skip = adjust; |
2178 | lines = abs(lines); | |
5d5314d6 | 2179 | } else if (lines > 0) { |
bc792e61 AV |
2180 | skip = n - lines - adjust; |
2181 | lines = abs(lines); | |
5d5314d6 JW |
2182 | if (adjust >= n) { |
2183 | kdb_printf("buffer only contains %d lines, " | |
2184 | "nothing printed\n", n); | |
2185 | skip = n; | |
2186 | } else if (skip < 0) { | |
2187 | lines += skip; | |
2188 | skip = 0; | |
2189 | kdb_printf("buffer only contains %d lines, first " | |
2190 | "%d lines printed\n", n, lines); | |
2191 | } | |
bc792e61 AV |
2192 | } else { |
2193 | lines = n; | |
5d5314d6 | 2194 | } |
bc792e61 AV |
2195 | |
2196 | if (skip >= n || skip < 0) | |
2197 | return 0; | |
2198 | ||
a4f98765 JO |
2199 | kmsg_dump_rewind(&iter); |
2200 | while (kmsg_dump_get_line(&iter, 1, buf, sizeof(buf), &len)) { | |
bc792e61 AV |
2201 | if (skip) { |
2202 | skip--; | |
2203 | continue; | |
5d5314d6 | 2204 | } |
bc792e61 AV |
2205 | if (!lines--) |
2206 | break; | |
d1871b38 JW |
2207 | if (KDB_FLAG(CMD_INTERRUPT)) |
2208 | return 0; | |
bc792e61 AV |
2209 | |
2210 | kdb_printf("%.*s\n", (int)len - 1, buf); | |
5d5314d6 | 2211 | } |
5d5314d6 JW |
2212 | |
2213 | return 0; | |
2214 | } | |
2215 | #endif /* CONFIG_PRINTK */ | |
ad394f66 AV |
2216 | |
2217 | /* Make sure we balance enable/disable calls, must disable first. */ | |
2218 | static atomic_t kdb_nmi_disabled; | |
2219 | ||
2220 | static int kdb_disable_nmi(int argc, const char *argv[]) | |
2221 | { | |
2222 | if (atomic_read(&kdb_nmi_disabled)) | |
2223 | return 0; | |
2224 | atomic_set(&kdb_nmi_disabled, 1); | |
2225 | arch_kgdb_ops.enable_nmi(0); | |
2226 | return 0; | |
2227 | } | |
2228 | ||
2229 | static int kdb_param_enable_nmi(const char *val, const struct kernel_param *kp) | |
2230 | { | |
2231 | if (!atomic_add_unless(&kdb_nmi_disabled, -1, 0)) | |
2232 | return -EINVAL; | |
2233 | arch_kgdb_ops.enable_nmi(1); | |
2234 | return 0; | |
2235 | } | |
2236 | ||
2237 | static const struct kernel_param_ops kdb_param_ops_enable_nmi = { | |
2238 | .set = kdb_param_enable_nmi, | |
2239 | }; | |
2240 | module_param_cb(enable_nmi, &kdb_param_ops_enable_nmi, NULL, 0600); | |
2241 | ||
5d5314d6 JW |
2242 | /* |
2243 | * kdb_cpu - This function implements the 'cpu' command. | |
2244 | * cpu [<cpunum>] | |
2245 | * Returns: | |
2246 | * KDB_CMD_CPU for success, a kdb diagnostic if error | |
2247 | */ | |
2248 | static void kdb_cpu_status(void) | |
2249 | { | |
2250 | int i, start_cpu, first_print = 1; | |
2251 | char state, prev_state = '?'; | |
2252 | ||
2253 | kdb_printf("Currently on cpu %d\n", raw_smp_processor_id()); | |
2254 | kdb_printf("Available cpus: "); | |
2255 | for (start_cpu = -1, i = 0; i < NR_CPUS; i++) { | |
2256 | if (!cpu_online(i)) { | |
2257 | state = 'F'; /* cpu is offline */ | |
a1465d2f DT |
2258 | } else if (!kgdb_info[i].enter_kgdb) { |
2259 | state = 'D'; /* cpu is online but unresponsive */ | |
5d5314d6 JW |
2260 | } else { |
2261 | state = ' '; /* cpu is responding to kdb */ | |
b77dbc86 DT |
2262 | if (kdb_task_state_char(KDB_TSK(i)) == '-') |
2263 | state = '-'; /* idle task */ | |
5d5314d6 JW |
2264 | } |
2265 | if (state != prev_state) { | |
2266 | if (prev_state != '?') { | |
2267 | if (!first_print) | |
2268 | kdb_printf(", "); | |
2269 | first_print = 0; | |
2270 | kdb_printf("%d", start_cpu); | |
2271 | if (start_cpu < i-1) | |
2272 | kdb_printf("-%d", i-1); | |
2273 | if (prev_state != ' ') | |
2274 | kdb_printf("(%c)", prev_state); | |
2275 | } | |
2276 | prev_state = state; | |
2277 | start_cpu = i; | |
2278 | } | |
2279 | } | |
2280 | /* print the trailing cpus, ignoring them if they are all offline */ | |
2281 | if (prev_state != 'F') { | |
2282 | if (!first_print) | |
2283 | kdb_printf(", "); | |
2284 | kdb_printf("%d", start_cpu); | |
2285 | if (start_cpu < i-1) | |
2286 | kdb_printf("-%d", i-1); | |
2287 | if (prev_state != ' ') | |
2288 | kdb_printf("(%c)", prev_state); | |
2289 | } | |
2290 | kdb_printf("\n"); | |
2291 | } | |
2292 | ||
2293 | static int kdb_cpu(int argc, const char **argv) | |
2294 | { | |
2295 | unsigned long cpunum; | |
2296 | int diag; | |
2297 | ||
2298 | if (argc == 0) { | |
2299 | kdb_cpu_status(); | |
2300 | return 0; | |
2301 | } | |
2302 | ||
2303 | if (argc != 1) | |
2304 | return KDB_ARGCOUNT; | |
2305 | ||
2306 | diag = kdbgetularg(argv[1], &cpunum); | |
2307 | if (diag) | |
2308 | return diag; | |
2309 | ||
2310 | /* | |
2311 | * Validate cpunum | |
2312 | */ | |
df0036d1 | 2313 | if ((cpunum >= CONFIG_NR_CPUS) || !kgdb_info[cpunum].enter_kgdb) |
5d5314d6 JW |
2314 | return KDB_BADCPUNUM; |
2315 | ||
2316 | dbg_switch_cpu = cpunum; | |
2317 | ||
2318 | /* | |
2319 | * Switch to other cpu | |
2320 | */ | |
2321 | return KDB_CMD_CPU; | |
2322 | } | |
2323 | ||
2324 | /* The user may not realize that ps/bta with no parameters does not print idle | |
2325 | * or sleeping system daemon processes, so tell them how many were suppressed. | |
2326 | */ | |
2327 | void kdb_ps_suppressed(void) | |
2328 | { | |
2329 | int idle = 0, daemon = 0; | |
5d5314d6 JW |
2330 | unsigned long cpu; |
2331 | const struct task_struct *p, *g; | |
2332 | for_each_online_cpu(cpu) { | |
2333 | p = kdb_curr_task(cpu); | |
b77dbc86 | 2334 | if (kdb_task_state(p, "-")) |
5d5314d6 JW |
2335 | ++idle; |
2336 | } | |
ece4ceaf | 2337 | for_each_process_thread(g, p) { |
b77dbc86 | 2338 | if (kdb_task_state(p, "ims")) |
5d5314d6 | 2339 | ++daemon; |
ece4ceaf | 2340 | } |
5d5314d6 JW |
2341 | if (idle || daemon) { |
2342 | if (idle) | |
b77dbc86 | 2343 | kdb_printf("%d idle process%s (state -)%s\n", |
5d5314d6 JW |
2344 | idle, idle == 1 ? "" : "es", |
2345 | daemon ? " and " : ""); | |
2346 | if (daemon) | |
b77dbc86 | 2347 | kdb_printf("%d sleeping system daemon (state [ims]) " |
5d5314d6 JW |
2348 | "process%s", daemon, |
2349 | daemon == 1 ? "" : "es"); | |
2350 | kdb_printf(" suppressed,\nuse 'ps A' to see all.\n"); | |
2351 | } | |
2352 | } | |
2353 | ||
5d5314d6 JW |
2354 | void kdb_ps1(const struct task_struct *p) |
2355 | { | |
2356 | int cpu; | |
2357 | unsigned long tmp; | |
2358 | ||
fe557319 CH |
2359 | if (!p || |
2360 | copy_from_kernel_nofault(&tmp, (char *)p, sizeof(unsigned long))) | |
5d5314d6 JW |
2361 | return; |
2362 | ||
2363 | cpu = kdb_process_cpu(p); | |
568fb6f4 | 2364 | kdb_printf("0x%px %8d %8d %d %4d %c 0x%px %c%s\n", |
5d5314d6 JW |
2365 | (void *)p, p->pid, p->parent->pid, |
2366 | kdb_task_has_cpu(p), kdb_process_cpu(p), | |
2367 | kdb_task_state_char(p), | |
2368 | (void *)(&p->thread), | |
2369 | p == kdb_curr_task(raw_smp_processor_id()) ? '*' : ' ', | |
2370 | p->comm); | |
2371 | if (kdb_task_has_cpu(p)) { | |
2372 | if (!KDB_TSK(cpu)) { | |
2373 | kdb_printf(" Error: no saved data for this cpu\n"); | |
2374 | } else { | |
2375 | if (KDB_TSK(cpu) != p) | |
2376 | kdb_printf(" Error: does not match running " | |
568fb6f4 | 2377 | "process table (0x%px)\n", KDB_TSK(cpu)); |
5d5314d6 JW |
2378 | } |
2379 | } | |
2380 | } | |
2381 | ||
b77dbc86 DT |
2382 | /* |
2383 | * kdb_ps - This function implements the 'ps' command which shows a | |
2384 | * list of the active processes. | |
2385 | * | |
2386 | * ps [<state_chars>] Show processes, optionally selecting only those whose | |
2387 | * state character is found in <state_chars>. | |
2388 | */ | |
5d5314d6 JW |
2389 | static int kdb_ps(int argc, const char **argv) |
2390 | { | |
2391 | struct task_struct *g, *p; | |
b77dbc86 DT |
2392 | const char *mask; |
2393 | unsigned long cpu; | |
5d5314d6 JW |
2394 | |
2395 | if (argc == 0) | |
2396 | kdb_ps_suppressed(); | |
2397 | kdb_printf("%-*s Pid Parent [*] cpu State %-*s Command\n", | |
2398 | (int)(2*sizeof(void *))+2, "Task Addr", | |
2399 | (int)(2*sizeof(void *))+2, "Thread"); | |
b77dbc86 | 2400 | mask = argc ? argv[1] : kdbgetenv("PS"); |
5d5314d6 JW |
2401 | /* Run the active tasks first */ |
2402 | for_each_online_cpu(cpu) { | |
2403 | if (KDB_FLAG(CMD_INTERRUPT)) | |
2404 | return 0; | |
2405 | p = kdb_curr_task(cpu); | |
2406 | if (kdb_task_state(p, mask)) | |
2407 | kdb_ps1(p); | |
2408 | } | |
2409 | kdb_printf("\n"); | |
2410 | /* Now the real tasks */ | |
ece4ceaf | 2411 | for_each_process_thread(g, p) { |
5d5314d6 JW |
2412 | if (KDB_FLAG(CMD_INTERRUPT)) |
2413 | return 0; | |
2414 | if (kdb_task_state(p, mask)) | |
2415 | kdb_ps1(p); | |
ece4ceaf | 2416 | } |
5d5314d6 JW |
2417 | |
2418 | return 0; | |
2419 | } | |
2420 | ||
2421 | /* | |
2422 | * kdb_pid - This function implements the 'pid' command which switches | |
2423 | * the currently active process. | |
2424 | * pid [<pid> | R] | |
2425 | */ | |
2426 | static int kdb_pid(int argc, const char **argv) | |
2427 | { | |
2428 | struct task_struct *p; | |
2429 | unsigned long val; | |
2430 | int diag; | |
2431 | ||
2432 | if (argc > 1) | |
2433 | return KDB_ARGCOUNT; | |
2434 | ||
2435 | if (argc) { | |
2436 | if (strcmp(argv[1], "R") == 0) { | |
2437 | p = KDB_TSK(kdb_initial_cpu); | |
2438 | } else { | |
2439 | diag = kdbgetularg(argv[1], &val); | |
2440 | if (diag) | |
2441 | return KDB_BADINT; | |
2442 | ||
2443 | p = find_task_by_pid_ns((pid_t)val, &init_pid_ns); | |
2444 | if (!p) { | |
2445 | kdb_printf("No task with pid=%d\n", (pid_t)val); | |
2446 | return 0; | |
2447 | } | |
2448 | } | |
2449 | kdb_set_current_task(p); | |
2450 | } | |
2451 | kdb_printf("KDB current process is %s(pid=%d)\n", | |
2452 | kdb_current_task->comm, | |
2453 | kdb_current_task->pid); | |
2454 | ||
2455 | return 0; | |
2456 | } | |
2457 | ||
5d5314d6 JW |
2458 | static int kdb_kgdb(int argc, const char **argv) |
2459 | { | |
2460 | return KDB_CMD_KGDB; | |
2461 | } | |
2462 | ||
2463 | /* | |
2464 | * kdb_help - This function implements the 'help' and '?' commands. | |
2465 | */ | |
2466 | static int kdb_help(int argc, const char **argv) | |
2467 | { | |
2468 | kdbtab_t *kt; | |
5d5314d6 JW |
2469 | |
2470 | kdb_printf("%-15.15s %-20.20s %s\n", "Command", "Usage", "Description"); | |
2471 | kdb_printf("-----------------------------" | |
2472 | "-----------------------------\n"); | |
e4f291b3 | 2473 | list_for_each_entry(kt, &kdb_cmds_head, list_node) { |
074604af | 2474 | char *space = ""; |
5d5314d6 JW |
2475 | if (KDB_FLAG(CMD_INTERRUPT)) |
2476 | return 0; | |
e868f0a3 | 2477 | if (!kdb_check_flags(kt->flags, kdb_cmd_enabled, true)) |
420c2b1b | 2478 | continue; |
e868f0a3 | 2479 | if (strlen(kt->usage) > 20) |
074604af | 2480 | space = "\n "; |
e868f0a3 SG |
2481 | kdb_printf("%-15.15s %-20s%s%s\n", kt->name, |
2482 | kt->usage, space, kt->help); | |
5d5314d6 JW |
2483 | } |
2484 | return 0; | |
2485 | } | |
2486 | ||
2487 | /* | |
2488 | * kdb_kill - This function implements the 'kill' commands. | |
2489 | */ | |
2490 | static int kdb_kill(int argc, const char **argv) | |
2491 | { | |
2492 | long sig, pid; | |
2493 | char *endp; | |
2494 | struct task_struct *p; | |
5d5314d6 JW |
2495 | |
2496 | if (argc != 2) | |
2497 | return KDB_ARGCOUNT; | |
2498 | ||
2499 | sig = simple_strtol(argv[1], &endp, 0); | |
2500 | if (*endp) | |
2501 | return KDB_BADINT; | |
0b44bf9a | 2502 | if ((sig >= 0) || !valid_signal(-sig)) { |
5d5314d6 JW |
2503 | kdb_printf("Invalid signal parameter.<-signal>\n"); |
2504 | return 0; | |
2505 | } | |
2506 | sig = -sig; | |
2507 | ||
2508 | pid = simple_strtol(argv[2], &endp, 0); | |
2509 | if (*endp) | |
2510 | return KDB_BADINT; | |
2511 | if (pid <= 0) { | |
2512 | kdb_printf("Process ID must be large than 0.\n"); | |
2513 | return 0; | |
2514 | } | |
2515 | ||
2516 | /* Find the process. */ | |
2517 | p = find_task_by_pid_ns(pid, &init_pid_ns); | |
2518 | if (!p) { | |
2519 | kdb_printf("The specified process isn't found.\n"); | |
2520 | return 0; | |
2521 | } | |
2522 | p = p->group_leader; | |
0b44bf9a | 2523 | kdb_send_sig(p, sig); |
5d5314d6 JW |
2524 | return 0; |
2525 | } | |
2526 | ||
5d5314d6 JW |
2527 | /* |
2528 | * Most of this code has been lifted from kernel/timer.c::sys_sysinfo(). | |
2529 | * I cannot call that code directly from kdb, it has an unconditional | |
2530 | * cli()/sti() and calls routines that take locks which can stop the debugger. | |
2531 | */ | |
2532 | static void kdb_sysinfo(struct sysinfo *val) | |
2533 | { | |
40b90efe BW |
2534 | u64 uptime = ktime_get_mono_fast_ns(); |
2535 | ||
5d5314d6 | 2536 | memset(val, 0, sizeof(*val)); |
40b90efe | 2537 | val->uptime = div_u64(uptime, NSEC_PER_SEC); |
5d5314d6 JW |
2538 | val->loads[0] = avenrun[0]; |
2539 | val->loads[1] = avenrun[1]; | |
2540 | val->loads[2] = avenrun[2]; | |
2541 | val->procs = nr_threads-1; | |
2542 | si_meminfo(val); | |
2543 | ||
2544 | return; | |
2545 | } | |
2546 | ||
2547 | /* | |
2548 | * kdb_summary - This function implements the 'summary' command. | |
2549 | */ | |
2550 | static int kdb_summary(int argc, const char **argv) | |
2551 | { | |
6909e29f | 2552 | time64_t now; |
5d5314d6 JW |
2553 | struct sysinfo val; |
2554 | ||
2555 | if (argc) | |
2556 | return KDB_ARGCOUNT; | |
2557 | ||
2558 | kdb_printf("sysname %s\n", init_uts_ns.name.sysname); | |
2559 | kdb_printf("release %s\n", init_uts_ns.name.release); | |
2560 | kdb_printf("version %s\n", init_uts_ns.name.version); | |
2561 | kdb_printf("machine %s\n", init_uts_ns.name.machine); | |
2562 | kdb_printf("nodename %s\n", init_uts_ns.name.nodename); | |
2563 | kdb_printf("domainname %s\n", init_uts_ns.name.domainname); | |
5d5314d6 | 2564 | |
6909e29f | 2565 | now = __ktime_get_real_seconds(); |
126ac4d6 | 2566 | kdb_printf("date %ptTs tz_minuteswest %d\n", &now, sys_tz.tz_minuteswest); |
5d5314d6 JW |
2567 | kdb_sysinfo(&val); |
2568 | kdb_printf("uptime "); | |
2569 | if (val.uptime > (24*60*60)) { | |
2570 | int days = val.uptime / (24*60*60); | |
2571 | val.uptime %= (24*60*60); | |
2572 | kdb_printf("%d day%s ", days, days == 1 ? "" : "s"); | |
2573 | } | |
2574 | kdb_printf("%02ld:%02ld\n", val.uptime/(60*60), (val.uptime/60)%60); | |
2575 | ||
5d5314d6 JW |
2576 | kdb_printf("load avg %ld.%02ld %ld.%02ld %ld.%02ld\n", |
2577 | LOAD_INT(val.loads[0]), LOAD_FRAC(val.loads[0]), | |
2578 | LOAD_INT(val.loads[1]), LOAD_FRAC(val.loads[1]), | |
2579 | LOAD_INT(val.loads[2]), LOAD_FRAC(val.loads[2])); | |
8508cf3f | 2580 | |
5d5314d6 JW |
2581 | /* Display in kilobytes */ |
2582 | #define K(x) ((x) << (PAGE_SHIFT - 10)) | |
2583 | kdb_printf("\nMemTotal: %8lu kB\nMemFree: %8lu kB\n" | |
2584 | "Buffers: %8lu kB\n", | |
14675592 | 2585 | K(val.totalram), K(val.freeram), K(val.bufferram)); |
5d5314d6 JW |
2586 | return 0; |
2587 | } | |
2588 | ||
2589 | /* | |
2590 | * kdb_per_cpu - This function implements the 'per_cpu' command. | |
2591 | */ | |
2592 | static int kdb_per_cpu(int argc, const char **argv) | |
2593 | { | |
931ea248 JW |
2594 | char fmtstr[64]; |
2595 | int cpu, diag, nextarg = 1; | |
2596 | unsigned long addr, symaddr, val, bytesperword = 0, whichcpu = ~0UL; | |
5d5314d6 JW |
2597 | |
2598 | if (argc < 1 || argc > 3) | |
2599 | return KDB_ARGCOUNT; | |
2600 | ||
931ea248 JW |
2601 | diag = kdbgetaddrarg(argc, argv, &nextarg, &symaddr, NULL, NULL); |
2602 | if (diag) | |
2603 | return diag; | |
2604 | ||
5d5314d6 JW |
2605 | if (argc >= 2) { |
2606 | diag = kdbgetularg(argv[2], &bytesperword); | |
2607 | if (diag) | |
2608 | return diag; | |
2609 | } | |
2610 | if (!bytesperword) | |
2611 | bytesperword = KDB_WORD_SIZE; | |
2612 | else if (bytesperword > KDB_WORD_SIZE) | |
2613 | return KDB_BADWIDTH; | |
2614 | sprintf(fmtstr, "%%0%dlx ", (int)(2*bytesperword)); | |
2615 | if (argc >= 3) { | |
2616 | diag = kdbgetularg(argv[3], &whichcpu); | |
2617 | if (diag) | |
2618 | return diag; | |
b586627e | 2619 | if (whichcpu >= nr_cpu_ids || !cpu_online(whichcpu)) { |
5d5314d6 JW |
2620 | kdb_printf("cpu %ld is not online\n", whichcpu); |
2621 | return KDB_BADCPUNUM; | |
2622 | } | |
2623 | } | |
2624 | ||
2625 | /* Most architectures use __per_cpu_offset[cpu], some use | |
2626 | * __per_cpu_offset(cpu), smp has no __per_cpu_offset. | |
2627 | */ | |
2628 | #ifdef __per_cpu_offset | |
2629 | #define KDB_PCU(cpu) __per_cpu_offset(cpu) | |
2630 | #else | |
2631 | #ifdef CONFIG_SMP | |
2632 | #define KDB_PCU(cpu) __per_cpu_offset[cpu] | |
2633 | #else | |
2634 | #define KDB_PCU(cpu) 0 | |
2635 | #endif | |
2636 | #endif | |
5d5314d6 | 2637 | for_each_online_cpu(cpu) { |
931ea248 JW |
2638 | if (KDB_FLAG(CMD_INTERRUPT)) |
2639 | return 0; | |
2640 | ||
5d5314d6 JW |
2641 | if (whichcpu != ~0UL && whichcpu != cpu) |
2642 | continue; | |
931ea248 | 2643 | addr = symaddr + KDB_PCU(cpu); |
5d5314d6 JW |
2644 | diag = kdb_getword(&val, addr, bytesperword); |
2645 | if (diag) { | |
2646 | kdb_printf("%5d " kdb_bfd_vma_fmt0 " - unable to " | |
2647 | "read, diag=%d\n", cpu, addr, diag); | |
2648 | continue; | |
2649 | } | |
5d5314d6 JW |
2650 | kdb_printf("%5d ", cpu); |
2651 | kdb_md_line(fmtstr, addr, | |
2652 | bytesperword == KDB_WORD_SIZE, | |
2653 | 1, bytesperword, 1, 1, 0); | |
2654 | } | |
5d5314d6 | 2655 | #undef KDB_PCU |
5d5314d6 JW |
2656 | return 0; |
2657 | } | |
2658 | ||
2659 | /* | |
2660 | * display help for the use of cmd | grep pattern | |
2661 | */ | |
2662 | static int kdb_grep_help(int argc, const char **argv) | |
2663 | { | |
2664 | kdb_printf("Usage of cmd args | grep pattern:\n"); | |
2665 | kdb_printf(" Any command's output may be filtered through an "); | |
2666 | kdb_printf("emulated 'pipe'.\n"); | |
2667 | kdb_printf(" 'grep' is just a key word.\n"); | |
2668 | kdb_printf(" The pattern may include a very limited set of " | |
2669 | "metacharacters:\n"); | |
2670 | kdb_printf(" pattern or ^pattern or pattern$ or ^pattern$\n"); | |
2671 | kdb_printf(" And if there are spaces in the pattern, you may " | |
2672 | "quote it:\n"); | |
2673 | kdb_printf(" \"pat tern\" or \"^pat tern\" or \"pat tern$\"" | |
2674 | " or \"^pat tern$\"\n"); | |
2675 | return 0; | |
2676 | } | |
2677 | ||
c25abcd6 SG |
2678 | /** |
2679 | * kdb_register() - This function is used to register a kernel debugger | |
2680 | * command. | |
2681 | * @cmd: pointer to kdb command | |
2682 | * | |
2683 | * Note that it's the job of the caller to keep the memory for the cmd | |
2684 | * allocated until unregister is called. | |
5d5314d6 | 2685 | */ |
c25abcd6 | 2686 | int kdb_register(kdbtab_t *cmd) |
5d5314d6 | 2687 | { |
5d5314d6 JW |
2688 | kdbtab_t *kp; |
2689 | ||
e4f291b3 | 2690 | list_for_each_entry(kp, &kdb_cmds_head, list_node) { |
e868f0a3 | 2691 | if (strcmp(kp->name, cmd->name) == 0) { |
c25abcd6 | 2692 | kdb_printf("Duplicate kdb cmd: %s, func %p help %s\n", |
e868f0a3 | 2693 | cmd->name, cmd->func, cmd->help); |
5d5314d6 JW |
2694 | return 1; |
2695 | } | |
2696 | } | |
2697 | ||
c25abcd6 | 2698 | list_add_tail(&cmd->list_node, &kdb_cmds_head); |
5d5314d6 JW |
2699 | return 0; |
2700 | } | |
c25abcd6 | 2701 | EXPORT_SYMBOL_GPL(kdb_register); |
f7030bbc | 2702 | |
c25abcd6 | 2703 | /** |
e4f291b3 SG |
2704 | * kdb_register_table() - This function is used to register a kdb command |
2705 | * table. | |
2706 | * @kp: pointer to kdb command table | |
2707 | * @len: length of kdb command table | |
2708 | */ | |
2709 | void kdb_register_table(kdbtab_t *kp, size_t len) | |
2710 | { | |
2711 | while (len--) { | |
2712 | list_add_tail(&kp->list_node, &kdb_cmds_head); | |
2713 | kp++; | |
2714 | } | |
2715 | } | |
5d5314d6 | 2716 | |
c25abcd6 SG |
2717 | /** |
2718 | * kdb_unregister() - This function is used to unregister a kernel debugger | |
2719 | * command. It is generally called when a module which | |
2720 | * implements kdb command is unloaded. | |
2721 | * @cmd: pointer to kdb command | |
5d5314d6 | 2722 | */ |
c25abcd6 | 2723 | void kdb_unregister(kdbtab_t *cmd) |
5d5314d6 | 2724 | { |
c25abcd6 | 2725 | list_del(&cmd->list_node); |
5d5314d6 | 2726 | } |
f7030bbc | 2727 | EXPORT_SYMBOL_GPL(kdb_unregister); |
5d5314d6 | 2728 | |
e4f291b3 | 2729 | static kdbtab_t maintab[] = { |
e868f0a3 SG |
2730 | { .name = "md", |
2731 | .func = kdb_md, | |
2732 | .usage = "<vaddr>", | |
2733 | .help = "Display Memory Contents, also mdWcN, e.g. md8c1", | |
2734 | .minlen = 1, | |
2735 | .flags = KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS, | |
e4f291b3 | 2736 | }, |
e868f0a3 SG |
2737 | { .name = "mdr", |
2738 | .func = kdb_md, | |
2739 | .usage = "<vaddr> <bytes>", | |
2740 | .help = "Display Raw Memory", | |
2741 | .flags = KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS, | |
e4f291b3 | 2742 | }, |
e868f0a3 SG |
2743 | { .name = "mdp", |
2744 | .func = kdb_md, | |
2745 | .usage = "<paddr> <bytes>", | |
2746 | .help = "Display Physical Memory", | |
2747 | .flags = KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS, | |
e4f291b3 | 2748 | }, |
e868f0a3 SG |
2749 | { .name = "mds", |
2750 | .func = kdb_md, | |
2751 | .usage = "<vaddr>", | |
2752 | .help = "Display Memory Symbolically", | |
2753 | .flags = KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS, | |
e4f291b3 | 2754 | }, |
e868f0a3 SG |
2755 | { .name = "mm", |
2756 | .func = kdb_mm, | |
2757 | .usage = "<vaddr> <contents>", | |
2758 | .help = "Modify Memory Contents", | |
2759 | .flags = KDB_ENABLE_MEM_WRITE | KDB_REPEAT_NO_ARGS, | |
e4f291b3 | 2760 | }, |
e868f0a3 SG |
2761 | { .name = "go", |
2762 | .func = kdb_go, | |
2763 | .usage = "[<vaddr>]", | |
2764 | .help = "Continue Execution", | |
2765 | .minlen = 1, | |
2766 | .flags = KDB_ENABLE_REG_WRITE | | |
e4f291b3 SG |
2767 | KDB_ENABLE_ALWAYS_SAFE_NO_ARGS, |
2768 | }, | |
e868f0a3 SG |
2769 | { .name = "rd", |
2770 | .func = kdb_rd, | |
2771 | .usage = "", | |
2772 | .help = "Display Registers", | |
2773 | .flags = KDB_ENABLE_REG_READ, | |
e4f291b3 | 2774 | }, |
e868f0a3 SG |
2775 | { .name = "rm", |
2776 | .func = kdb_rm, | |
2777 | .usage = "<reg> <contents>", | |
2778 | .help = "Modify Registers", | |
2779 | .flags = KDB_ENABLE_REG_WRITE, | |
e4f291b3 | 2780 | }, |
e868f0a3 SG |
2781 | { .name = "ef", |
2782 | .func = kdb_ef, | |
2783 | .usage = "<vaddr>", | |
2784 | .help = "Display exception frame", | |
2785 | .flags = KDB_ENABLE_MEM_READ, | |
e4f291b3 | 2786 | }, |
e868f0a3 SG |
2787 | { .name = "bt", |
2788 | .func = kdb_bt, | |
2789 | .usage = "[<vaddr>]", | |
2790 | .help = "Stack traceback", | |
2791 | .minlen = 1, | |
2792 | .flags = KDB_ENABLE_MEM_READ | KDB_ENABLE_INSPECT_NO_ARGS, | |
e4f291b3 | 2793 | }, |
e868f0a3 SG |
2794 | { .name = "btp", |
2795 | .func = kdb_bt, | |
2796 | .usage = "<pid>", | |
2797 | .help = "Display stack for process <pid>", | |
2798 | .flags = KDB_ENABLE_INSPECT, | |
e4f291b3 | 2799 | }, |
e868f0a3 SG |
2800 | { .name = "bta", |
2801 | .func = kdb_bt, | |
b77dbc86 DT |
2802 | .usage = "[<state_chars>|A]", |
2803 | .help = "Backtrace all processes whose state matches", | |
e868f0a3 | 2804 | .flags = KDB_ENABLE_INSPECT, |
e4f291b3 | 2805 | }, |
e868f0a3 SG |
2806 | { .name = "btc", |
2807 | .func = kdb_bt, | |
2808 | .usage = "", | |
2809 | .help = "Backtrace current process on each cpu", | |
2810 | .flags = KDB_ENABLE_INSPECT, | |
e4f291b3 | 2811 | }, |
e868f0a3 SG |
2812 | { .name = "btt", |
2813 | .func = kdb_bt, | |
2814 | .usage = "<vaddr>", | |
2815 | .help = "Backtrace process given its struct task address", | |
2816 | .flags = KDB_ENABLE_MEM_READ | KDB_ENABLE_INSPECT_NO_ARGS, | |
e4f291b3 | 2817 | }, |
e868f0a3 SG |
2818 | { .name = "env", |
2819 | .func = kdb_env, | |
2820 | .usage = "", | |
2821 | .help = "Show environment variables", | |
2822 | .flags = KDB_ENABLE_ALWAYS_SAFE, | |
e4f291b3 | 2823 | }, |
e868f0a3 SG |
2824 | { .name = "set", |
2825 | .func = kdb_set, | |
2826 | .usage = "", | |
2827 | .help = "Set environment variables", | |
2828 | .flags = KDB_ENABLE_ALWAYS_SAFE, | |
e4f291b3 | 2829 | }, |
e868f0a3 SG |
2830 | { .name = "help", |
2831 | .func = kdb_help, | |
2832 | .usage = "", | |
2833 | .help = "Display Help Message", | |
2834 | .minlen = 1, | |
2835 | .flags = KDB_ENABLE_ALWAYS_SAFE, | |
e4f291b3 | 2836 | }, |
e868f0a3 SG |
2837 | { .name = "?", |
2838 | .func = kdb_help, | |
2839 | .usage = "", | |
2840 | .help = "Display Help Message", | |
2841 | .flags = KDB_ENABLE_ALWAYS_SAFE, | |
e4f291b3 | 2842 | }, |
e868f0a3 SG |
2843 | { .name = "cpu", |
2844 | .func = kdb_cpu, | |
2845 | .usage = "<cpunum>", | |
2846 | .help = "Switch to new cpu", | |
2847 | .flags = KDB_ENABLE_ALWAYS_SAFE_NO_ARGS, | |
e4f291b3 | 2848 | }, |
e868f0a3 SG |
2849 | { .name = "kgdb", |
2850 | .func = kdb_kgdb, | |
2851 | .usage = "", | |
2852 | .help = "Enter kgdb mode", | |
2853 | .flags = 0, | |
e4f291b3 | 2854 | }, |
e868f0a3 SG |
2855 | { .name = "ps", |
2856 | .func = kdb_ps, | |
b77dbc86 | 2857 | .usage = "[<state_chars>|A]", |
e868f0a3 SG |
2858 | .help = "Display active task list", |
2859 | .flags = KDB_ENABLE_INSPECT, | |
e4f291b3 | 2860 | }, |
e868f0a3 SG |
2861 | { .name = "pid", |
2862 | .func = kdb_pid, | |
2863 | .usage = "<pidnum>", | |
2864 | .help = "Switch to another task", | |
2865 | .flags = KDB_ENABLE_INSPECT, | |
e4f291b3 | 2866 | }, |
e868f0a3 SG |
2867 | { .name = "reboot", |
2868 | .func = kdb_reboot, | |
2869 | .usage = "", | |
2870 | .help = "Reboot the machine immediately", | |
2871 | .flags = KDB_ENABLE_REBOOT, | |
e4f291b3 | 2872 | }, |
5d5314d6 | 2873 | #if defined(CONFIG_MODULES) |
e868f0a3 SG |
2874 | { .name = "lsmod", |
2875 | .func = kdb_lsmod, | |
2876 | .usage = "", | |
2877 | .help = "List loaded kernel modules", | |
2878 | .flags = KDB_ENABLE_INSPECT, | |
e4f291b3 | 2879 | }, |
5d5314d6 JW |
2880 | #endif |
2881 | #if defined(CONFIG_MAGIC_SYSRQ) | |
e868f0a3 SG |
2882 | { .name = "sr", |
2883 | .func = kdb_sr, | |
2884 | .usage = "<key>", | |
2885 | .help = "Magic SysRq key", | |
2886 | .flags = KDB_ENABLE_ALWAYS_SAFE, | |
e4f291b3 | 2887 | }, |
5d5314d6 JW |
2888 | #endif |
2889 | #if defined(CONFIG_PRINTK) | |
e868f0a3 SG |
2890 | { .name = "dmesg", |
2891 | .func = kdb_dmesg, | |
2892 | .usage = "[lines]", | |
2893 | .help = "Display syslog buffer", | |
2894 | .flags = KDB_ENABLE_ALWAYS_SAFE, | |
e4f291b3 | 2895 | }, |
5d5314d6 | 2896 | #endif |
e868f0a3 SG |
2897 | { .name = "defcmd", |
2898 | .func = kdb_defcmd, | |
2899 | .usage = "name \"usage\" \"help\"", | |
2900 | .help = "Define a set of commands, down to endefcmd", | |
c25abcd6 SG |
2901 | /* |
2902 | * Macros are always safe because when executed each | |
2903 | * internal command re-enters kdb_parse() and is safety | |
2904 | * checked individually. | |
2905 | */ | |
e868f0a3 | 2906 | .flags = KDB_ENABLE_ALWAYS_SAFE, |
e4f291b3 | 2907 | }, |
e868f0a3 SG |
2908 | { .name = "kill", |
2909 | .func = kdb_kill, | |
2910 | .usage = "<-signal> <pid>", | |
2911 | .help = "Send a signal to a process", | |
2912 | .flags = KDB_ENABLE_SIGNAL, | |
e4f291b3 | 2913 | }, |
e868f0a3 SG |
2914 | { .name = "summary", |
2915 | .func = kdb_summary, | |
2916 | .usage = "", | |
2917 | .help = "Summarize the system", | |
2918 | .minlen = 4, | |
2919 | .flags = KDB_ENABLE_ALWAYS_SAFE, | |
e4f291b3 | 2920 | }, |
e868f0a3 SG |
2921 | { .name = "per_cpu", |
2922 | .func = kdb_per_cpu, | |
2923 | .usage = "<sym> [<bytes>] [<cpu>]", | |
2924 | .help = "Display per_cpu variables", | |
2925 | .minlen = 3, | |
2926 | .flags = KDB_ENABLE_MEM_READ, | |
e4f291b3 | 2927 | }, |
e868f0a3 SG |
2928 | { .name = "grephelp", |
2929 | .func = kdb_grep_help, | |
2930 | .usage = "", | |
2931 | .help = "Display help on | grep", | |
2932 | .flags = KDB_ENABLE_ALWAYS_SAFE, | |
e4f291b3 SG |
2933 | }, |
2934 | }; | |
2935 | ||
2936 | static kdbtab_t nmicmd = { | |
e868f0a3 SG |
2937 | .name = "disable_nmi", |
2938 | .func = kdb_disable_nmi, | |
2939 | .usage = "", | |
2940 | .help = "Disable NMI entry to KDB", | |
2941 | .flags = KDB_ENABLE_ALWAYS_SAFE, | |
e4f291b3 SG |
2942 | }; |
2943 | ||
2944 | /* Initialize the kdb command table. */ | |
2945 | static void __init kdb_inittab(void) | |
2946 | { | |
2947 | kdb_register_table(maintab, ARRAY_SIZE(maintab)); | |
2948 | if (arch_kgdb_ops.enable_nmi) | |
2949 | kdb_register_table(&nmicmd, 1); | |
5d5314d6 JW |
2950 | } |
2951 | ||
2952 | /* Execute any commands defined in kdb_cmds. */ | |
2953 | static void __init kdb_cmd_init(void) | |
2954 | { | |
2955 | int i, diag; | |
2956 | for (i = 0; kdb_cmds[i]; ++i) { | |
2957 | diag = kdb_parse(kdb_cmds[i]); | |
2958 | if (diag) | |
2959 | kdb_printf("kdb command %s failed, kdb diag %d\n", | |
2960 | kdb_cmds[i], diag); | |
2961 | } | |
2962 | if (defcmd_in_progress) { | |
2963 | kdb_printf("Incomplete 'defcmd' set, forcing endefcmd\n"); | |
2964 | kdb_parse("endefcmd"); | |
2965 | } | |
2966 | } | |
2967 | ||
b595076a | 2968 | /* Initialize kdb_printf, breakpoint tables and kdb state */ |
5d5314d6 JW |
2969 | void __init kdb_init(int lvl) |
2970 | { | |
2971 | static int kdb_init_lvl = KDB_NOT_INITIALIZED; | |
2972 | int i; | |
2973 | ||
2974 | if (kdb_init_lvl == KDB_INIT_FULL || lvl <= kdb_init_lvl) | |
2975 | return; | |
2976 | for (i = kdb_init_lvl; i < lvl; i++) { | |
2977 | switch (i) { | |
2978 | case KDB_NOT_INITIALIZED: | |
2979 | kdb_inittab(); /* Initialize Command Table */ | |
2980 | kdb_initbptab(); /* Initialize Breakpoints */ | |
2981 | break; | |
2982 | case KDB_INIT_EARLY: | |
2983 | kdb_cmd_init(); /* Build kdb_cmds tables */ | |
2984 | break; | |
2985 | } | |
2986 | } | |
2987 | kdb_init_lvl = lvl; | |
2988 | } |