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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> |
420c2b1b | 29 | #include <linux/moduleparam.h> |
5d5314d6 JW |
30 | #include <linux/mm.h> |
31 | #include <linux/init.h> | |
32 | #include <linux/kallsyms.h> | |
33 | #include <linux/kgdb.h> | |
34 | #include <linux/kdb.h> | |
35 | #include <linux/notifier.h> | |
36 | #include <linux/interrupt.h> | |
37 | #include <linux/delay.h> | |
38 | #include <linux/nmi.h> | |
39 | #include <linux/time.h> | |
40 | #include <linux/ptrace.h> | |
41 | #include <linux/sysctl.h> | |
42 | #include <linux/cpu.h> | |
43 | #include <linux/kdebug.h> | |
44 | #include <linux/proc_fs.h> | |
45 | #include <linux/uaccess.h> | |
46 | #include <linux/slab.h> | |
eadb2f47 | 47 | #include <linux/security.h> |
5d5314d6 JW |
48 | #include "kdb_private.h" |
49 | ||
420c2b1b AV |
50 | #undef MODULE_PARAM_PREFIX |
51 | #define MODULE_PARAM_PREFIX "kdb." | |
52 | ||
b8017177 | 53 | static int kdb_cmd_enabled = CONFIG_KDB_DEFAULT_ENABLE; |
420c2b1b AV |
54 | module_param_named(cmd_enable, kdb_cmd_enabled, int, 0600); |
55 | ||
fb6daa75 | 56 | char kdb_grep_string[KDB_GREP_STRLEN]; |
5d5314d6 JW |
57 | int kdb_grepping_flag; |
58 | EXPORT_SYMBOL(kdb_grepping_flag); | |
59 | int kdb_grep_leading; | |
60 | int kdb_grep_trailing; | |
61 | ||
62 | /* | |
63 | * Kernel debugger state flags | |
64 | */ | |
c893de12 | 65 | unsigned int kdb_flags; |
5d5314d6 JW |
66 | |
67 | /* | |
68 | * kdb_lock protects updates to kdb_initial_cpu. Used to | |
69 | * single thread processors through the kernel debugger. | |
70 | */ | |
71 | int kdb_initial_cpu = -1; /* cpu number that owns kdb */ | |
72 | int kdb_nextline = 1; | |
73 | int kdb_state; /* General KDB state */ | |
74 | ||
75 | struct task_struct *kdb_current_task; | |
5d5314d6 JW |
76 | struct pt_regs *kdb_current_regs; |
77 | ||
78 | const char *kdb_diemsg; | |
79 | static int kdb_go_count; | |
80 | #ifdef CONFIG_KDB_CONTINUE_CATASTROPHIC | |
81 | static unsigned int kdb_continue_catastrophic = | |
82 | CONFIG_KDB_CONTINUE_CATASTROPHIC; | |
83 | #else | |
84 | static unsigned int kdb_continue_catastrophic; | |
85 | #endif | |
86 | ||
e4f291b3 SG |
87 | /* kdb_cmds_head describes the available commands. */ |
88 | static LIST_HEAD(kdb_cmds_head); | |
5d5314d6 JW |
89 | |
90 | typedef struct _kdbmsg { | |
91 | int km_diag; /* kdb diagnostic */ | |
92 | char *km_msg; /* Corresponding message text */ | |
93 | } kdbmsg_t; | |
94 | ||
95 | #define KDBMSG(msgnum, text) \ | |
96 | { KDB_##msgnum, text } | |
97 | ||
98 | static kdbmsg_t kdbmsgs[] = { | |
99 | KDBMSG(NOTFOUND, "Command Not Found"), | |
100 | KDBMSG(ARGCOUNT, "Improper argument count, see usage."), | |
101 | KDBMSG(BADWIDTH, "Illegal value for BYTESPERWORD use 1, 2, 4 or 8, " | |
102 | "8 is only allowed on 64 bit systems"), | |
103 | KDBMSG(BADRADIX, "Illegal value for RADIX use 8, 10 or 16"), | |
104 | KDBMSG(NOTENV, "Cannot find environment variable"), | |
105 | KDBMSG(NOENVVALUE, "Environment variable should have value"), | |
106 | KDBMSG(NOTIMP, "Command not implemented"), | |
107 | KDBMSG(ENVFULL, "Environment full"), | |
108 | KDBMSG(ENVBUFFULL, "Environment buffer full"), | |
109 | KDBMSG(TOOMANYBPT, "Too many breakpoints defined"), | |
110 | #ifdef CONFIG_CPU_XSCALE | |
111 | KDBMSG(TOOMANYDBREGS, "More breakpoints than ibcr registers defined"), | |
112 | #else | |
113 | KDBMSG(TOOMANYDBREGS, "More breakpoints than db registers defined"), | |
114 | #endif | |
115 | KDBMSG(DUPBPT, "Duplicate breakpoint address"), | |
116 | KDBMSG(BPTNOTFOUND, "Breakpoint not found"), | |
117 | KDBMSG(BADMODE, "Invalid IDMODE"), | |
118 | KDBMSG(BADINT, "Illegal numeric value"), | |
119 | KDBMSG(INVADDRFMT, "Invalid symbolic address format"), | |
120 | KDBMSG(BADREG, "Invalid register name"), | |
121 | KDBMSG(BADCPUNUM, "Invalid cpu number"), | |
122 | KDBMSG(BADLENGTH, "Invalid length field"), | |
123 | KDBMSG(NOBP, "No Breakpoint exists"), | |
124 | KDBMSG(BADADDR, "Invalid address"), | |
420c2b1b | 125 | KDBMSG(NOPERM, "Permission denied"), |
5d5314d6 JW |
126 | }; |
127 | #undef KDBMSG | |
128 | ||
5f784f79 | 129 | static const int __nkdb_err = ARRAY_SIZE(kdbmsgs); |
5d5314d6 JW |
130 | |
131 | ||
132 | /* | |
133 | * Initial environment. This is all kept static and local to | |
134 | * this file. We don't want to rely on the memory allocation | |
135 | * mechanisms in the kernel, so we use a very limited allocate-only | |
136 | * heap for new and altered environment variables. The entire | |
137 | * environment is limited to a fixed number of entries (add more | |
138 | * to __env[] if required) and a fixed amount of heap (add more to | |
139 | * KDB_ENVBUFSIZE if required). | |
140 | */ | |
141 | ||
83fa2d13 | 142 | static char *__env[31] = { |
5d5314d6 | 143 | #if defined(CONFIG_SMP) |
83fa2d13 | 144 | "PROMPT=[%d]kdb> ", |
5d5314d6 | 145 | #else |
83fa2d13 | 146 | "PROMPT=kdb> ", |
5d5314d6 | 147 | #endif |
83fa2d13 SG |
148 | "MOREPROMPT=more> ", |
149 | "RADIX=16", | |
150 | "MDCOUNT=8", /* lines of md output */ | |
151 | KDB_PLATFORM_ENV, | |
152 | "DTABCOUNT=30", | |
153 | "NOSECT=1", | |
5d5314d6 JW |
154 | }; |
155 | ||
5f784f79 | 156 | static const int __nenv = ARRAY_SIZE(__env); |
5d5314d6 JW |
157 | |
158 | struct task_struct *kdb_curr_task(int cpu) | |
159 | { | |
160 | struct task_struct *p = curr_task(cpu); | |
161 | #ifdef _TIF_MCA_INIT | |
162 | if ((task_thread_info(p)->flags & _TIF_MCA_INIT) && KDB_TSK(cpu)) | |
163 | p = krp->p; | |
164 | #endif | |
165 | return p; | |
166 | } | |
167 | ||
9452e977 | 168 | /* |
eadb2f47 DT |
169 | * Update the permissions flags (kdb_cmd_enabled) to match the |
170 | * current lockdown state. | |
171 | * | |
172 | * Within this function the calls to security_locked_down() are "lazy". We | |
173 | * avoid calling them if the current value of kdb_cmd_enabled already excludes | |
174 | * flags that might be subject to lockdown. Additionally we deliberately check | |
175 | * the lockdown flags independently (even though read lockdown implies write | |
176 | * lockdown) since that results in both simpler code and clearer messages to | |
177 | * the user on first-time debugger entry. | |
178 | * | |
179 | * The permission masks during a read+write lockdown permits the following | |
180 | * flags: INSPECT, SIGNAL, REBOOT (and ALWAYS_SAFE). | |
181 | * | |
182 | * The INSPECT commands are not blocked during lockdown because they are | |
183 | * not arbitrary memory reads. INSPECT covers the backtrace family (sometimes | |
184 | * forcing them to have no arguments) and lsmod. These commands do expose | |
185 | * some kernel state but do not allow the developer seated at the console to | |
186 | * choose what state is reported. SIGNAL and REBOOT should not be controversial, | |
187 | * given these are allowed for root during lockdown already. | |
188 | */ | |
189 | static void kdb_check_for_lockdown(void) | |
190 | { | |
191 | const int write_flags = KDB_ENABLE_MEM_WRITE | | |
192 | KDB_ENABLE_REG_WRITE | | |
193 | KDB_ENABLE_FLOW_CTRL; | |
194 | const int read_flags = KDB_ENABLE_MEM_READ | | |
195 | KDB_ENABLE_REG_READ; | |
196 | ||
197 | bool need_to_lockdown_write = false; | |
198 | bool need_to_lockdown_read = false; | |
199 | ||
200 | if (kdb_cmd_enabled & (KDB_ENABLE_ALL | write_flags)) | |
201 | need_to_lockdown_write = | |
202 | security_locked_down(LOCKDOWN_DBG_WRITE_KERNEL); | |
203 | ||
204 | if (kdb_cmd_enabled & (KDB_ENABLE_ALL | read_flags)) | |
205 | need_to_lockdown_read = | |
206 | security_locked_down(LOCKDOWN_DBG_READ_KERNEL); | |
207 | ||
208 | /* De-compose KDB_ENABLE_ALL if required */ | |
209 | if (need_to_lockdown_write || need_to_lockdown_read) | |
210 | if (kdb_cmd_enabled & KDB_ENABLE_ALL) | |
211 | kdb_cmd_enabled = KDB_ENABLE_MASK & ~KDB_ENABLE_ALL; | |
212 | ||
213 | if (need_to_lockdown_write) | |
214 | kdb_cmd_enabled &= ~write_flags; | |
215 | ||
216 | if (need_to_lockdown_read) | |
217 | kdb_cmd_enabled &= ~read_flags; | |
218 | } | |
219 | ||
220 | /* | |
221 | * Check whether the flags of the current command, the permissions of the kdb | |
222 | * console and the lockdown state allow a command to be run. | |
9452e977 | 223 | */ |
eadb2f47 | 224 | static bool kdb_check_flags(kdb_cmdflags_t flags, int permissions, |
9452e977 DT |
225 | bool no_args) |
226 | { | |
227 | /* permissions comes from userspace so needs massaging slightly */ | |
228 | permissions &= KDB_ENABLE_MASK; | |
229 | permissions |= KDB_ENABLE_ALWAYS_SAFE; | |
230 | ||
231 | /* some commands change group when launched with no arguments */ | |
232 | if (no_args) | |
233 | permissions |= permissions << KDB_ENABLE_NO_ARGS_SHIFT; | |
234 | ||
235 | flags |= KDB_ENABLE_ALL; | |
236 | ||
237 | return permissions & flags; | |
238 | } | |
239 | ||
5d5314d6 JW |
240 | /* |
241 | * kdbgetenv - This function will return the character string value of | |
242 | * an environment variable. | |
243 | * Parameters: | |
244 | * match A character string representing an environment variable. | |
245 | * Returns: | |
246 | * NULL No environment variable matches 'match' | |
247 | * char* Pointer to string value of environment variable. | |
248 | */ | |
249 | char *kdbgetenv(const char *match) | |
250 | { | |
251 | char **ep = __env; | |
252 | int matchlen = strlen(match); | |
253 | int i; | |
254 | ||
255 | for (i = 0; i < __nenv; i++) { | |
256 | char *e = *ep++; | |
257 | ||
258 | if (!e) | |
259 | continue; | |
260 | ||
261 | if ((strncmp(match, e, matchlen) == 0) | |
262 | && ((e[matchlen] == '\0') | |
263 | || (e[matchlen] == '='))) { | |
264 | char *cp = strchr(e, '='); | |
265 | return cp ? ++cp : ""; | |
266 | } | |
267 | } | |
268 | return NULL; | |
269 | } | |
270 | ||
271 | /* | |
272 | * kdballocenv - This function is used to allocate bytes for | |
273 | * environment entries. | |
274 | * Parameters: | |
23816724 | 275 | * bytes The number of bytes to allocate in the static buffer. |
5d5314d6 | 276 | * Returns: |
23816724 YP |
277 | * A pointer to the allocated space in the buffer on success. |
278 | * NULL if bytes > size available in the envbuffer. | |
5d5314d6 JW |
279 | * Remarks: |
280 | * We use a static environment buffer (envbuffer) to hold the values | |
281 | * of dynamically generated environment variables (see kdb_set). Buffer | |
282 | * space once allocated is never free'd, so over time, the amount of space | |
283 | * (currently 512 bytes) will be exhausted if env variables are changed | |
284 | * frequently. | |
285 | */ | |
286 | static char *kdballocenv(size_t bytes) | |
287 | { | |
288 | #define KDB_ENVBUFSIZE 512 | |
289 | static char envbuffer[KDB_ENVBUFSIZE]; | |
290 | static int envbufsize; | |
291 | char *ep = NULL; | |
292 | ||
293 | if ((KDB_ENVBUFSIZE - envbufsize) >= bytes) { | |
294 | ep = &envbuffer[envbufsize]; | |
295 | envbufsize += bytes; | |
296 | } | |
297 | return ep; | |
298 | } | |
299 | ||
300 | /* | |
301 | * kdbgetulenv - This function will return the value of an unsigned | |
302 | * long-valued environment variable. | |
303 | * Parameters: | |
304 | * match A character string representing a numeric value | |
305 | * Outputs: | |
220a31b0 | 306 | * *value the unsigned long representation of the env variable 'match' |
5d5314d6 JW |
307 | * Returns: |
308 | * Zero on success, a kdb diagnostic on failure. | |
309 | */ | |
310 | static int kdbgetulenv(const char *match, unsigned long *value) | |
311 | { | |
312 | char *ep; | |
313 | ||
314 | ep = kdbgetenv(match); | |
315 | if (!ep) | |
316 | return KDB_NOTENV; | |
317 | if (strlen(ep) == 0) | |
318 | return KDB_NOENVVALUE; | |
319 | ||
320 | *value = simple_strtoul(ep, NULL, 0); | |
321 | ||
322 | return 0; | |
323 | } | |
324 | ||
325 | /* | |
326 | * kdbgetintenv - This function will return the value of an | |
327 | * integer-valued environment variable. | |
328 | * Parameters: | |
329 | * match A character string representing an integer-valued env variable | |
330 | * Outputs: | |
331 | * *value the integer representation of the environment variable 'match' | |
332 | * Returns: | |
333 | * Zero on success, a kdb diagnostic on failure. | |
334 | */ | |
335 | int kdbgetintenv(const char *match, int *value) | |
336 | { | |
337 | unsigned long val; | |
338 | int diag; | |
339 | ||
340 | diag = kdbgetulenv(match, &val); | |
341 | if (!diag) | |
342 | *value = (int) val; | |
343 | return diag; | |
344 | } | |
345 | ||
83fa2d13 SG |
346 | /* |
347 | * kdb_setenv() - Alter an existing environment variable or create a new one. | |
348 | * @var: Name of the variable | |
349 | * @val: Value of the variable | |
350 | * | |
351 | * Return: Zero on success, a kdb diagnostic on failure. | |
352 | */ | |
353 | static int kdb_setenv(const char *var, const char *val) | |
354 | { | |
355 | int i; | |
356 | char *ep; | |
357 | size_t varlen, vallen; | |
358 | ||
359 | varlen = strlen(var); | |
360 | vallen = strlen(val); | |
361 | ep = kdballocenv(varlen + vallen + 2); | |
362 | if (ep == (char *)0) | |
363 | return KDB_ENVBUFFULL; | |
364 | ||
365 | sprintf(ep, "%s=%s", var, val); | |
366 | ||
367 | for (i = 0; i < __nenv; i++) { | |
368 | if (__env[i] | |
369 | && ((strncmp(__env[i], var, varlen) == 0) | |
370 | && ((__env[i][varlen] == '\0') | |
371 | || (__env[i][varlen] == '=')))) { | |
372 | __env[i] = ep; | |
373 | return 0; | |
374 | } | |
375 | } | |
376 | ||
377 | /* | |
378 | * Wasn't existing variable. Fit into slot. | |
379 | */ | |
380 | for (i = 0; i < __nenv-1; i++) { | |
381 | if (__env[i] == (char *)0) { | |
382 | __env[i] = ep; | |
383 | return 0; | |
384 | } | |
385 | } | |
386 | ||
387 | return KDB_ENVFULL; | |
388 | } | |
389 | ||
390 | /* | |
391 | * kdb_printenv() - Display the current environment variables. | |
392 | */ | |
393 | static void kdb_printenv(void) | |
394 | { | |
395 | int i; | |
396 | ||
397 | for (i = 0; i < __nenv; i++) { | |
398 | if (__env[i]) | |
399 | kdb_printf("%s\n", __env[i]); | |
400 | } | |
401 | } | |
402 | ||
5d5314d6 JW |
403 | /* |
404 | * kdbgetularg - This function will convert a numeric string into an | |
405 | * unsigned long value. | |
406 | * Parameters: | |
407 | * arg A character string representing a numeric value | |
408 | * Outputs: | |
220a31b0 | 409 | * *value the unsigned long representation of arg. |
5d5314d6 JW |
410 | * Returns: |
411 | * Zero on success, a kdb diagnostic on failure. | |
412 | */ | |
413 | int kdbgetularg(const char *arg, unsigned long *value) | |
414 | { | |
415 | char *endp; | |
416 | unsigned long val; | |
417 | ||
418 | val = simple_strtoul(arg, &endp, 0); | |
419 | ||
420 | if (endp == arg) { | |
421 | /* | |
534af108 | 422 | * Also try base 16, for us folks too lazy to type the |
5d5314d6 JW |
423 | * leading 0x... |
424 | */ | |
425 | val = simple_strtoul(arg, &endp, 16); | |
426 | if (endp == arg) | |
427 | return KDB_BADINT; | |
428 | } | |
429 | ||
430 | *value = val; | |
431 | ||
432 | return 0; | |
433 | } | |
434 | ||
534af108 JW |
435 | int kdbgetu64arg(const char *arg, u64 *value) |
436 | { | |
437 | char *endp; | |
438 | u64 val; | |
439 | ||
440 | val = simple_strtoull(arg, &endp, 0); | |
441 | ||
442 | if (endp == arg) { | |
443 | ||
444 | val = simple_strtoull(arg, &endp, 16); | |
445 | if (endp == arg) | |
446 | return KDB_BADINT; | |
447 | } | |
448 | ||
449 | *value = val; | |
450 | ||
451 | return 0; | |
452 | } | |
453 | ||
5d5314d6 JW |
454 | /* |
455 | * kdb_set - This function implements the 'set' command. Alter an | |
456 | * existing environment variable or create a new one. | |
457 | */ | |
458 | int kdb_set(int argc, const char **argv) | |
459 | { | |
5d5314d6 JW |
460 | /* |
461 | * we can be invoked two ways: | |
462 | * set var=value argv[1]="var", argv[2]="value" | |
463 | * set var = value argv[1]="var", argv[2]="=", argv[3]="value" | |
464 | * - if the latter, shift 'em down. | |
465 | */ | |
466 | if (argc == 3) { | |
467 | argv[2] = argv[3]; | |
468 | argc--; | |
469 | } | |
470 | ||
471 | if (argc != 2) | |
472 | return KDB_ARGCOUNT; | |
473 | ||
ad99b510 DT |
474 | /* |
475 | * Censor sensitive variables | |
476 | */ | |
477 | if (strcmp(argv[1], "PROMPT") == 0 && | |
478 | !kdb_check_flags(KDB_ENABLE_MEM_READ, kdb_cmd_enabled, false)) | |
479 | return KDB_NOPERM; | |
480 | ||
5d5314d6 JW |
481 | /* |
482 | * Check for internal variables | |
483 | */ | |
484 | if (strcmp(argv[1], "KDBDEBUG") == 0) { | |
485 | unsigned int debugflags; | |
486 | char *cp; | |
487 | ||
488 | debugflags = simple_strtoul(argv[2], &cp, 0); | |
489 | if (cp == argv[2] || debugflags & ~KDB_DEBUG_FLAG_MASK) { | |
490 | kdb_printf("kdb: illegal debug flags '%s'\n", | |
491 | argv[2]); | |
492 | return 0; | |
493 | } | |
c893de12 | 494 | kdb_flags = (kdb_flags & ~KDB_DEBUG(MASK)) |
5d5314d6 JW |
495 | | (debugflags << KDB_DEBUG_FLAG_SHIFT); |
496 | ||
497 | return 0; | |
498 | } | |
499 | ||
500 | /* | |
501 | * Tokenizer squashed the '=' sign. argv[1] is variable | |
502 | * name, argv[2] = value. | |
503 | */ | |
83fa2d13 | 504 | return kdb_setenv(argv[1], argv[2]); |
5d5314d6 JW |
505 | } |
506 | ||
507 | static int kdb_check_regs(void) | |
508 | { | |
509 | if (!kdb_current_regs) { | |
510 | kdb_printf("No current kdb registers." | |
511 | " You may need to select another task\n"); | |
512 | return KDB_BADREG; | |
513 | } | |
514 | return 0; | |
515 | } | |
516 | ||
517 | /* | |
518 | * kdbgetaddrarg - This function is responsible for parsing an | |
519 | * address-expression and returning the value of the expression, | |
520 | * symbol name, and offset to the caller. | |
521 | * | |
522 | * The argument may consist of a numeric value (decimal or | |
220a31b0 | 523 | * hexadecimal), a symbol name, a register name (preceded by the |
5d5314d6 | 524 | * percent sign), an environment variable with a numeric value |
25985edc | 525 | * (preceded by a dollar sign) or a simple arithmetic expression |
5d5314d6 JW |
526 | * consisting of a symbol name, +/-, and a numeric constant value |
527 | * (offset). | |
528 | * Parameters: | |
529 | * argc - count of arguments in argv | |
530 | * argv - argument vector | |
531 | * *nextarg - index to next unparsed argument in argv[] | |
532 | * regs - Register state at time of KDB entry | |
533 | * Outputs: | |
534 | * *value - receives the value of the address-expression | |
535 | * *offset - receives the offset specified, if any | |
536 | * *name - receives the symbol name, if any | |
537 | * *nextarg - index to next unparsed argument in argv[] | |
538 | * Returns: | |
539 | * zero is returned on success, a kdb diagnostic code is | |
540 | * returned on error. | |
541 | */ | |
542 | int kdbgetaddrarg(int argc, const char **argv, int *nextarg, | |
543 | unsigned long *value, long *offset, | |
544 | char **name) | |
545 | { | |
546 | unsigned long addr; | |
547 | unsigned long off = 0; | |
548 | int positive; | |
549 | int diag; | |
550 | int found = 0; | |
551 | char *symname; | |
552 | char symbol = '\0'; | |
553 | char *cp; | |
554 | kdb_symtab_t symtab; | |
555 | ||
420c2b1b AV |
556 | /* |
557 | * If the enable flags prohibit both arbitrary memory access | |
558 | * and flow control then there are no reasonable grounds to | |
559 | * provide symbol lookup. | |
560 | */ | |
561 | if (!kdb_check_flags(KDB_ENABLE_MEM_READ | KDB_ENABLE_FLOW_CTRL, | |
562 | kdb_cmd_enabled, false)) | |
563 | return KDB_NOPERM; | |
564 | ||
5d5314d6 JW |
565 | /* |
566 | * Process arguments which follow the following syntax: | |
567 | * | |
568 | * symbol | numeric-address [+/- numeric-offset] | |
569 | * %register | |
570 | * $environment-variable | |
571 | */ | |
572 | ||
573 | if (*nextarg > argc) | |
574 | return KDB_ARGCOUNT; | |
575 | ||
576 | symname = (char *)argv[*nextarg]; | |
577 | ||
578 | /* | |
579 | * If there is no whitespace between the symbol | |
580 | * or address and the '+' or '-' symbols, we | |
581 | * remember the character and replace it with a | |
582 | * null so the symbol/value can be properly parsed | |
583 | */ | |
584 | cp = strpbrk(symname, "+-"); | |
585 | if (cp != NULL) { | |
586 | symbol = *cp; | |
587 | *cp++ = '\0'; | |
588 | } | |
589 | ||
590 | if (symname[0] == '$') { | |
591 | diag = kdbgetulenv(&symname[1], &addr); | |
592 | if (diag) | |
593 | return diag; | |
594 | } else if (symname[0] == '%') { | |
fcf2736c DT |
595 | diag = kdb_check_regs(); |
596 | if (diag) | |
597 | return diag; | |
5d5314d6 JW |
598 | /* Implement register values with % at a later time as it is |
599 | * arch optional. | |
600 | */ | |
601 | return KDB_NOTIMP; | |
602 | } else { | |
603 | found = kdbgetsymval(symname, &symtab); | |
604 | if (found) { | |
605 | addr = symtab.sym_start; | |
606 | } else { | |
607 | diag = kdbgetularg(argv[*nextarg], &addr); | |
608 | if (diag) | |
609 | return diag; | |
610 | } | |
611 | } | |
612 | ||
613 | if (!found) | |
614 | found = kdbnearsym(addr, &symtab); | |
615 | ||
616 | (*nextarg)++; | |
617 | ||
618 | if (name) | |
619 | *name = symname; | |
620 | if (value) | |
621 | *value = addr; | |
622 | if (offset && name && *name) | |
623 | *offset = addr - symtab.sym_start; | |
624 | ||
625 | if ((*nextarg > argc) | |
626 | && (symbol == '\0')) | |
627 | return 0; | |
628 | ||
629 | /* | |
630 | * check for +/- and offset | |
631 | */ | |
632 | ||
633 | if (symbol == '\0') { | |
634 | if ((argv[*nextarg][0] != '+') | |
635 | && (argv[*nextarg][0] != '-')) { | |
636 | /* | |
637 | * Not our argument. Return. | |
638 | */ | |
639 | return 0; | |
640 | } else { | |
641 | positive = (argv[*nextarg][0] == '+'); | |
642 | (*nextarg)++; | |
643 | } | |
644 | } else | |
645 | positive = (symbol == '+'); | |
646 | ||
647 | /* | |
648 | * Now there must be an offset! | |
649 | */ | |
650 | if ((*nextarg > argc) | |
651 | && (symbol == '\0')) { | |
652 | return KDB_INVADDRFMT; | |
653 | } | |
654 | ||
655 | if (!symbol) { | |
656 | cp = (char *)argv[*nextarg]; | |
657 | (*nextarg)++; | |
658 | } | |
659 | ||
660 | diag = kdbgetularg(cp, &off); | |
661 | if (diag) | |
662 | return diag; | |
663 | ||
664 | if (!positive) | |
665 | off = -off; | |
666 | ||
667 | if (offset) | |
668 | *offset += off; | |
669 | ||
670 | if (value) | |
671 | *value += off; | |
672 | ||
673 | return 0; | |
674 | } | |
675 | ||
676 | static void kdb_cmderror(int diag) | |
677 | { | |
678 | int i; | |
679 | ||
680 | if (diag >= 0) { | |
681 | kdb_printf("no error detected (diagnostic is %d)\n", diag); | |
682 | return; | |
683 | } | |
684 | ||
685 | for (i = 0; i < __nkdb_err; i++) { | |
686 | if (kdbmsgs[i].km_diag == diag) { | |
687 | kdb_printf("diag: %d: %s\n", diag, kdbmsgs[i].km_msg); | |
688 | return; | |
689 | } | |
690 | } | |
691 | ||
692 | kdb_printf("Unknown diag %d\n", -diag); | |
693 | } | |
694 | ||
695 | /* | |
696 | * kdb_defcmd, kdb_defcmd2 - This function implements the 'defcmd' | |
697 | * command which defines one command as a set of other commands, | |
698 | * terminated by endefcmd. kdb_defcmd processes the initial | |
699 | * 'defcmd' command, kdb_defcmd2 is invoked from kdb_parse for | |
700 | * the following commands until 'endefcmd'. | |
701 | * Inputs: | |
702 | * argc argument count | |
703 | * argv argument vector | |
704 | * Returns: | |
705 | * zero for success, a kdb diagnostic if error | |
706 | */ | |
b39cded8 | 707 | struct kdb_macro { |
9a5db530 SG |
708 | kdbtab_t cmd; /* Macro command */ |
709 | struct list_head statements; /* Associated statement list */ | |
5d5314d6 | 710 | }; |
9a5db530 SG |
711 | |
712 | struct kdb_macro_statement { | |
713 | char *statement; /* Statement text */ | |
714 | struct list_head list_node; /* Statement list node */ | |
715 | }; | |
716 | ||
b39cded8 | 717 | static struct kdb_macro *kdb_macro; |
7faedcd4 | 718 | static bool defcmd_in_progress; |
5d5314d6 JW |
719 | |
720 | /* Forward references */ | |
721 | static int kdb_exec_defcmd(int argc, const char **argv); | |
722 | ||
723 | static int kdb_defcmd2(const char *cmdstr, const char *argv0) | |
724 | { | |
9a5db530 SG |
725 | struct kdb_macro_statement *kms; |
726 | ||
727 | if (!kdb_macro) | |
728 | return KDB_NOTIMP; | |
729 | ||
5d5314d6 | 730 | if (strcmp(argv0, "endefcmd") == 0) { |
7faedcd4 | 731 | defcmd_in_progress = false; |
9a5db530 SG |
732 | if (!list_empty(&kdb_macro->statements)) |
733 | kdb_register(&kdb_macro->cmd); | |
5d5314d6 JW |
734 | return 0; |
735 | } | |
9a5db530 SG |
736 | |
737 | kms = kmalloc(sizeof(*kms), GFP_KDB); | |
738 | if (!kms) { | |
739 | kdb_printf("Could not allocate new kdb macro command: %s\n", | |
5d5314d6 | 740 | cmdstr); |
5d5314d6 JW |
741 | return KDB_NOTIMP; |
742 | } | |
9a5db530 SG |
743 | |
744 | kms->statement = kdb_strdup(cmdstr, GFP_KDB); | |
745 | list_add_tail(&kms->list_node, &kdb_macro->statements); | |
746 | ||
5d5314d6 JW |
747 | return 0; |
748 | } | |
749 | ||
750 | static int kdb_defcmd(int argc, const char **argv) | |
751 | { | |
c25abcd6 SG |
752 | kdbtab_t *mp; |
753 | ||
5d5314d6 JW |
754 | if (defcmd_in_progress) { |
755 | kdb_printf("kdb: nested defcmd detected, assuming missing " | |
756 | "endefcmd\n"); | |
757 | kdb_defcmd2("endefcmd", "endefcmd"); | |
758 | } | |
759 | if (argc == 0) { | |
9a5db530 SG |
760 | kdbtab_t *kp; |
761 | struct kdb_macro *kmp; | |
762 | struct kdb_macro_statement *kms; | |
763 | ||
764 | list_for_each_entry(kp, &kdb_cmds_head, list_node) { | |
e868f0a3 | 765 | if (kp->func == kdb_exec_defcmd) { |
9a5db530 | 766 | kdb_printf("defcmd %s \"%s\" \"%s\"\n", |
e868f0a3 | 767 | kp->name, kp->usage, kp->help); |
9a5db530 SG |
768 | kmp = container_of(kp, struct kdb_macro, cmd); |
769 | list_for_each_entry(kms, &kmp->statements, | |
770 | list_node) | |
771 | kdb_printf("%s", kms->statement); | |
772 | kdb_printf("endefcmd\n"); | |
773 | } | |
5d5314d6 JW |
774 | } |
775 | return 0; | |
776 | } | |
777 | if (argc != 3) | |
778 | return KDB_ARGCOUNT; | |
a37372f6 JW |
779 | if (in_dbg_master()) { |
780 | kdb_printf("Command only available during kdb_init()\n"); | |
781 | return KDB_NOTIMP; | |
782 | } | |
9a5db530 | 783 | kdb_macro = kzalloc(sizeof(*kdb_macro), GFP_KDB); |
b39cded8 | 784 | if (!kdb_macro) |
4eb7a66d | 785 | goto fail_defcmd; |
c25abcd6 | 786 | |
9a5db530 | 787 | mp = &kdb_macro->cmd; |
e868f0a3 SG |
788 | mp->func = kdb_exec_defcmd; |
789 | mp->minlen = 0; | |
790 | mp->flags = KDB_ENABLE_ALWAYS_SAFE; | |
791 | mp->name = kdb_strdup(argv[1], GFP_KDB); | |
792 | if (!mp->name) | |
4eb7a66d | 793 | goto fail_name; |
e868f0a3 SG |
794 | mp->usage = kdb_strdup(argv[2], GFP_KDB); |
795 | if (!mp->usage) | |
4eb7a66d | 796 | goto fail_usage; |
e868f0a3 SG |
797 | mp->help = kdb_strdup(argv[3], GFP_KDB); |
798 | if (!mp->help) | |
4eb7a66d | 799 | goto fail_help; |
e868f0a3 SG |
800 | if (mp->usage[0] == '"') { |
801 | strcpy(mp->usage, argv[2]+1); | |
802 | mp->usage[strlen(mp->usage)-1] = '\0'; | |
5d5314d6 | 803 | } |
e868f0a3 SG |
804 | if (mp->help[0] == '"') { |
805 | strcpy(mp->help, argv[3]+1); | |
806 | mp->help[strlen(mp->help)-1] = '\0'; | |
5d5314d6 | 807 | } |
9a5db530 SG |
808 | |
809 | INIT_LIST_HEAD(&kdb_macro->statements); | |
7faedcd4 | 810 | defcmd_in_progress = true; |
5d5314d6 | 811 | return 0; |
4eb7a66d | 812 | fail_help: |
e868f0a3 | 813 | kfree(mp->usage); |
4eb7a66d | 814 | fail_usage: |
e868f0a3 | 815 | kfree(mp->name); |
4eb7a66d | 816 | fail_name: |
b39cded8 | 817 | kfree(kdb_macro); |
4eb7a66d | 818 | fail_defcmd: |
b39cded8 | 819 | kdb_printf("Could not allocate new kdb_macro entry for %s\n", argv[1]); |
4eb7a66d | 820 | return KDB_NOTIMP; |
5d5314d6 JW |
821 | } |
822 | ||
823 | /* | |
824 | * kdb_exec_defcmd - Execute the set of commands associated with this | |
825 | * defcmd name. | |
826 | * Inputs: | |
827 | * argc argument count | |
828 | * argv argument vector | |
829 | * Returns: | |
830 | * zero for success, a kdb diagnostic if error | |
831 | */ | |
832 | static int kdb_exec_defcmd(int argc, const char **argv) | |
833 | { | |
9a5db530 SG |
834 | int ret; |
835 | kdbtab_t *kp; | |
836 | struct kdb_macro *kmp; | |
837 | struct kdb_macro_statement *kms; | |
838 | ||
5d5314d6 JW |
839 | if (argc != 0) |
840 | return KDB_ARGCOUNT; | |
9a5db530 SG |
841 | |
842 | list_for_each_entry(kp, &kdb_cmds_head, list_node) { | |
e868f0a3 | 843 | if (strcmp(kp->name, argv[0]) == 0) |
5d5314d6 JW |
844 | break; |
845 | } | |
9a5db530 | 846 | if (list_entry_is_head(kp, &kdb_cmds_head, list_node)) { |
5d5314d6 JW |
847 | kdb_printf("kdb_exec_defcmd: could not find commands for %s\n", |
848 | argv[0]); | |
849 | return KDB_NOTIMP; | |
850 | } | |
9a5db530 SG |
851 | kmp = container_of(kp, struct kdb_macro, cmd); |
852 | list_for_each_entry(kms, &kmp->statements, list_node) { | |
853 | /* | |
854 | * Recursive use of kdb_parse, do not use argv after this point. | |
855 | */ | |
5d5314d6 | 856 | argv = NULL; |
e868f0a3 | 857 | kdb_printf("[%s]kdb> %s\n", kmp->cmd.name, kms->statement); |
9a5db530 | 858 | ret = kdb_parse(kms->statement); |
5d5314d6 JW |
859 | if (ret) |
860 | return ret; | |
861 | } | |
862 | return 0; | |
863 | } | |
864 | ||
865 | /* Command history */ | |
866 | #define KDB_CMD_HISTORY_COUNT 32 | |
867 | #define CMD_BUFLEN 200 /* kdb_printf: max printline | |
868 | * size == 256 */ | |
869 | static unsigned int cmd_head, cmd_tail; | |
870 | static unsigned int cmdptr; | |
871 | static char cmd_hist[KDB_CMD_HISTORY_COUNT][CMD_BUFLEN]; | |
872 | static char cmd_cur[CMD_BUFLEN]; | |
873 | ||
874 | /* | |
875 | * The "str" argument may point to something like | grep xyz | |
876 | */ | |
877 | static void parse_grep(const char *str) | |
878 | { | |
879 | int len; | |
880 | char *cp = (char *)str, *cp2; | |
881 | ||
882 | /* sanity check: we should have been called with the \ first */ | |
883 | if (*cp != '|') | |
884 | return; | |
885 | cp++; | |
886 | while (isspace(*cp)) | |
887 | cp++; | |
63571431 | 888 | if (!str_has_prefix(cp, "grep ")) { |
5d5314d6 JW |
889 | kdb_printf("invalid 'pipe', see grephelp\n"); |
890 | return; | |
891 | } | |
892 | cp += 5; | |
893 | while (isspace(*cp)) | |
894 | cp++; | |
895 | cp2 = strchr(cp, '\n'); | |
896 | if (cp2) | |
897 | *cp2 = '\0'; /* remove the trailing newline */ | |
898 | len = strlen(cp); | |
899 | if (len == 0) { | |
900 | kdb_printf("invalid 'pipe', see grephelp\n"); | |
901 | return; | |
902 | } | |
903 | /* now cp points to a nonzero length search string */ | |
904 | if (*cp == '"') { | |
905 | /* allow it be "x y z" by removing the "'s - there must | |
906 | be two of them */ | |
907 | cp++; | |
908 | cp2 = strchr(cp, '"'); | |
909 | if (!cp2) { | |
910 | kdb_printf("invalid quoted string, see grephelp\n"); | |
911 | return; | |
912 | } | |
913 | *cp2 = '\0'; /* end the string where the 2nd " was */ | |
914 | } | |
915 | kdb_grep_leading = 0; | |
916 | if (*cp == '^') { | |
917 | kdb_grep_leading = 1; | |
918 | cp++; | |
919 | } | |
920 | len = strlen(cp); | |
921 | kdb_grep_trailing = 0; | |
922 | if (*(cp+len-1) == '$') { | |
923 | kdb_grep_trailing = 1; | |
924 | *(cp+len-1) = '\0'; | |
925 | } | |
926 | len = strlen(cp); | |
927 | if (!len) | |
928 | return; | |
fb6daa75 | 929 | if (len >= KDB_GREP_STRLEN) { |
5d5314d6 JW |
930 | kdb_printf("search string too long\n"); |
931 | return; | |
932 | } | |
933 | strcpy(kdb_grep_string, cp); | |
934 | kdb_grepping_flag++; | |
935 | return; | |
936 | } | |
937 | ||
938 | /* | |
939 | * kdb_parse - Parse the command line, search the command table for a | |
940 | * matching command and invoke the command function. This | |
941 | * function may be called recursively, if it is, the second call | |
942 | * will overwrite argv and cbuf. It is the caller's | |
943 | * responsibility to save their argv if they recursively call | |
944 | * kdb_parse(). | |
945 | * Parameters: | |
946 | * cmdstr The input command line to be parsed. | |
947 | * regs The registers at the time kdb was entered. | |
948 | * Returns: | |
949 | * Zero for success, a kdb diagnostic if failure. | |
950 | * Remarks: | |
951 | * Limited to 20 tokens. | |
952 | * | |
953 | * Real rudimentary tokenization. Basically only whitespace | |
220a31b0 | 954 | * is considered a token delimiter (but special consideration |
5d5314d6 JW |
955 | * is taken of the '=' sign as used by the 'set' command). |
956 | * | |
957 | * The algorithm used to tokenize the input string relies on | |
958 | * there being at least one whitespace (or otherwise useless) | |
959 | * character between tokens as the character immediately following | |
960 | * the token is altered in-place to a null-byte to terminate the | |
961 | * token string. | |
962 | */ | |
963 | ||
964 | #define MAXARGC 20 | |
965 | ||
966 | int kdb_parse(const char *cmdstr) | |
967 | { | |
968 | static char *argv[MAXARGC]; | |
969 | static int argc; | |
970 | static char cbuf[CMD_BUFLEN+2]; | |
971 | char *cp; | |
972 | char *cpp, quoted; | |
973 | kdbtab_t *tp; | |
e4f291b3 | 974 | int escaped, ignore_errors = 0, check_grep = 0; |
5d5314d6 JW |
975 | |
976 | /* | |
977 | * First tokenize the command string. | |
978 | */ | |
979 | cp = (char *)cmdstr; | |
5d5314d6 JW |
980 | |
981 | if (KDB_FLAG(CMD_INTERRUPT)) { | |
982 | /* Previous command was interrupted, newline must not | |
983 | * repeat the command */ | |
984 | KDB_FLAG_CLEAR(CMD_INTERRUPT); | |
985 | KDB_STATE_SET(PAGER); | |
986 | argc = 0; /* no repeat */ | |
987 | } | |
988 | ||
989 | if (*cp != '\n' && *cp != '\0') { | |
990 | argc = 0; | |
991 | cpp = cbuf; | |
992 | while (*cp) { | |
993 | /* skip whitespace */ | |
994 | while (isspace(*cp)) | |
995 | cp++; | |
996 | if ((*cp == '\0') || (*cp == '\n') || | |
997 | (*cp == '#' && !defcmd_in_progress)) | |
998 | break; | |
999 | /* special case: check for | grep pattern */ | |
1000 | if (*cp == '|') { | |
1001 | check_grep++; | |
1002 | break; | |
1003 | } | |
1004 | if (cpp >= cbuf + CMD_BUFLEN) { | |
1005 | kdb_printf("kdb_parse: command buffer " | |
1006 | "overflow, command ignored\n%s\n", | |
1007 | cmdstr); | |
1008 | return KDB_NOTFOUND; | |
1009 | } | |
1010 | if (argc >= MAXARGC - 1) { | |
1011 | kdb_printf("kdb_parse: too many arguments, " | |
1012 | "command ignored\n%s\n", cmdstr); | |
1013 | return KDB_NOTFOUND; | |
1014 | } | |
1015 | argv[argc++] = cpp; | |
1016 | escaped = 0; | |
1017 | quoted = '\0'; | |
1018 | /* Copy to next unquoted and unescaped | |
1019 | * whitespace or '=' */ | |
1020 | while (*cp && *cp != '\n' && | |
1021 | (escaped || quoted || !isspace(*cp))) { | |
1022 | if (cpp >= cbuf + CMD_BUFLEN) | |
1023 | break; | |
1024 | if (escaped) { | |
1025 | escaped = 0; | |
1026 | *cpp++ = *cp++; | |
1027 | continue; | |
1028 | } | |
1029 | if (*cp == '\\') { | |
1030 | escaped = 1; | |
1031 | ++cp; | |
1032 | continue; | |
1033 | } | |
1034 | if (*cp == quoted) | |
1035 | quoted = '\0'; | |
1036 | else if (*cp == '\'' || *cp == '"') | |
1037 | quoted = *cp; | |
1038 | *cpp = *cp++; | |
1039 | if (*cpp == '=' && !quoted) | |
1040 | break; | |
1041 | ++cpp; | |
1042 | } | |
1043 | *cpp++ = '\0'; /* Squash a ws or '=' character */ | |
1044 | } | |
1045 | } | |
1046 | if (!argc) | |
1047 | return 0; | |
1048 | if (check_grep) | |
1049 | parse_grep(cp); | |
1050 | if (defcmd_in_progress) { | |
1051 | int result = kdb_defcmd2(cmdstr, argv[0]); | |
1052 | if (!defcmd_in_progress) { | |
1053 | argc = 0; /* avoid repeat on endefcmd */ | |
1054 | *(argv[0]) = '\0'; | |
1055 | } | |
1056 | return result; | |
1057 | } | |
1058 | if (argv[0][0] == '-' && argv[0][1] && | |
1059 | (argv[0][1] < '0' || argv[0][1] > '9')) { | |
1060 | ignore_errors = 1; | |
1061 | ++argv[0]; | |
1062 | } | |
1063 | ||
e4f291b3 SG |
1064 | list_for_each_entry(tp, &kdb_cmds_head, list_node) { |
1065 | /* | |
1066 | * If this command is allowed to be abbreviated, | |
1067 | * check to see if this is it. | |
1068 | */ | |
e868f0a3 SG |
1069 | if (tp->minlen && (strlen(argv[0]) <= tp->minlen) && |
1070 | (strncmp(argv[0], tp->name, tp->minlen) == 0)) | |
e4f291b3 | 1071 | break; |
5d5314d6 | 1072 | |
e868f0a3 | 1073 | if (strcmp(argv[0], tp->name) == 0) |
e4f291b3 | 1074 | break; |
5d5314d6 JW |
1075 | } |
1076 | ||
1077 | /* | |
1078 | * If we don't find a command by this name, see if the first | |
1079 | * few characters of this match any of the known commands. | |
1080 | * e.g., md1c20 should match md. | |
1081 | */ | |
e4f291b3 SG |
1082 | if (list_entry_is_head(tp, &kdb_cmds_head, list_node)) { |
1083 | list_for_each_entry(tp, &kdb_cmds_head, list_node) { | |
e868f0a3 | 1084 | if (strncmp(argv[0], tp->name, strlen(tp->name)) == 0) |
e4f291b3 | 1085 | break; |
5d5314d6 JW |
1086 | } |
1087 | } | |
1088 | ||
e4f291b3 | 1089 | if (!list_entry_is_head(tp, &kdb_cmds_head, list_node)) { |
5d5314d6 | 1090 | int result; |
420c2b1b | 1091 | |
e868f0a3 | 1092 | if (!kdb_check_flags(tp->flags, kdb_cmd_enabled, argc <= 1)) |
420c2b1b AV |
1093 | return KDB_NOPERM; |
1094 | ||
5d5314d6 | 1095 | KDB_STATE_SET(CMD); |
e868f0a3 | 1096 | result = (*tp->func)(argc-1, (const char **)argv); |
5d5314d6 JW |
1097 | if (result && ignore_errors && result > KDB_CMD_GO) |
1098 | result = 0; | |
1099 | KDB_STATE_CLEAR(CMD); | |
04bb171e | 1100 | |
e868f0a3 | 1101 | if (tp->flags & KDB_REPEAT_WITH_ARGS) |
04bb171e AV |
1102 | return result; |
1103 | ||
e868f0a3 | 1104 | argc = tp->flags & KDB_REPEAT_NO_ARGS ? 1 : 0; |
04bb171e AV |
1105 | if (argv[argc]) |
1106 | *(argv[argc]) = '\0'; | |
5d5314d6 JW |
1107 | return result; |
1108 | } | |
1109 | ||
1110 | /* | |
1111 | * If the input with which we were presented does not | |
1112 | * map to an existing command, attempt to parse it as an | |
1113 | * address argument and display the result. Useful for | |
1114 | * obtaining the address of a variable, or the nearest symbol | |
1115 | * to an address contained in a register. | |
1116 | */ | |
1117 | { | |
1118 | unsigned long value; | |
1119 | char *name = NULL; | |
1120 | long offset; | |
1121 | int nextarg = 0; | |
1122 | ||
1123 | if (kdbgetaddrarg(0, (const char **)argv, &nextarg, | |
1124 | &value, &offset, &name)) { | |
1125 | return KDB_NOTFOUND; | |
1126 | } | |
1127 | ||
1128 | kdb_printf("%s = ", argv[0]); | |
1129 | kdb_symbol_print(value, NULL, KDB_SP_DEFAULT); | |
1130 | kdb_printf("\n"); | |
1131 | return 0; | |
1132 | } | |
1133 | } | |
1134 | ||
1135 | ||
1136 | static int handle_ctrl_cmd(char *cmd) | |
1137 | { | |
1138 | #define CTRL_P 16 | |
1139 | #define CTRL_N 14 | |
1140 | ||
1141 | /* initial situation */ | |
1142 | if (cmd_head == cmd_tail) | |
1143 | return 0; | |
1144 | switch (*cmd) { | |
1145 | case CTRL_P: | |
1146 | if (cmdptr != cmd_tail) | |
1b310030 DA |
1147 | cmdptr = (cmdptr + KDB_CMD_HISTORY_COUNT - 1) % |
1148 | KDB_CMD_HISTORY_COUNT; | |
d228bee8 | 1149 | strscpy(cmd_cur, cmd_hist[cmdptr], CMD_BUFLEN); |
5d5314d6 JW |
1150 | return 1; |
1151 | case CTRL_N: | |
1152 | if (cmdptr != cmd_head) | |
1153 | cmdptr = (cmdptr+1) % KDB_CMD_HISTORY_COUNT; | |
d228bee8 | 1154 | strscpy(cmd_cur, cmd_hist[cmdptr], CMD_BUFLEN); |
5d5314d6 JW |
1155 | return 1; |
1156 | } | |
1157 | return 0; | |
1158 | } | |
1159 | ||
1160 | /* | |
1161 | * kdb_reboot - This function implements the 'reboot' command. Reboot | |
1162 | * the system immediately, or loop for ever on failure. | |
1163 | */ | |
1164 | static int kdb_reboot(int argc, const char **argv) | |
1165 | { | |
1166 | emergency_restart(); | |
1167 | kdb_printf("Hmm, kdb_reboot did not reboot, spinning here\n"); | |
1168 | while (1) | |
1169 | cpu_relax(); | |
1170 | /* NOTREACHED */ | |
1171 | return 0; | |
1172 | } | |
1173 | ||
1174 | static void kdb_dumpregs(struct pt_regs *regs) | |
1175 | { | |
1176 | int old_lvl = console_loglevel; | |
a8fe19eb | 1177 | console_loglevel = CONSOLE_LOGLEVEL_MOTORMOUTH; |
d37d39ae | 1178 | kdb_trap_printk++; |
5d5314d6 | 1179 | show_regs(regs); |
d37d39ae | 1180 | kdb_trap_printk--; |
5d5314d6 JW |
1181 | kdb_printf("\n"); |
1182 | console_loglevel = old_lvl; | |
1183 | } | |
1184 | ||
9441d5f6 | 1185 | static void kdb_set_current_task(struct task_struct *p) |
5d5314d6 JW |
1186 | { |
1187 | kdb_current_task = p; | |
1188 | ||
1189 | if (kdb_task_has_cpu(p)) { | |
1190 | kdb_current_regs = KDB_TSKREGS(kdb_process_cpu(p)); | |
1191 | return; | |
1192 | } | |
1193 | kdb_current_regs = NULL; | |
1194 | } | |
1195 | ||
b0f73bc7 RD |
1196 | static void drop_newline(char *buf) |
1197 | { | |
1198 | size_t len = strlen(buf); | |
1199 | ||
1200 | if (len == 0) | |
1201 | return; | |
1202 | if (*(buf + len - 1) == '\n') | |
1203 | *(buf + len - 1) = '\0'; | |
1204 | } | |
1205 | ||
5d5314d6 JW |
1206 | /* |
1207 | * kdb_local - The main code for kdb. This routine is invoked on a | |
1208 | * specific processor, it is not global. The main kdb() routine | |
1209 | * ensures that only one processor at a time is in this routine. | |
1210 | * This code is called with the real reason code on the first | |
1211 | * entry to a kdb session, thereafter it is called with reason | |
1212 | * SWITCH, even if the user goes back to the original cpu. | |
1213 | * Inputs: | |
1214 | * reason The reason KDB was invoked | |
1215 | * error The hardware-defined error code | |
1216 | * regs The exception frame at time of fault/breakpoint. | |
1217 | * db_result Result code from the break or debug point. | |
1218 | * Returns: | |
1219 | * 0 KDB was invoked for an event which it wasn't responsible | |
1220 | * 1 KDB handled the event for which it was invoked. | |
1221 | * KDB_CMD_GO User typed 'go'. | |
1222 | * KDB_CMD_CPU User switched to another cpu. | |
1223 | * KDB_CMD_SS Single step. | |
5d5314d6 JW |
1224 | */ |
1225 | static int kdb_local(kdb_reason_t reason, int error, struct pt_regs *regs, | |
1226 | kdb_dbtrap_t db_result) | |
1227 | { | |
1228 | char *cmdbuf; | |
1229 | int diag; | |
1230 | struct task_struct *kdb_current = | |
1231 | kdb_curr_task(raw_smp_processor_id()); | |
1232 | ||
1233 | KDB_DEBUG_STATE("kdb_local 1", reason); | |
eadb2f47 DT |
1234 | |
1235 | kdb_check_for_lockdown(); | |
1236 | ||
5d5314d6 JW |
1237 | kdb_go_count = 0; |
1238 | if (reason == KDB_REASON_DEBUG) { | |
1239 | /* special case below */ | |
1240 | } else { | |
568fb6f4 | 1241 | kdb_printf("\nEntering kdb (current=0x%px, pid %d) ", |
578bd4df | 1242 | kdb_current, kdb_current ? kdb_current->pid : 0); |
5d5314d6 JW |
1243 | #if defined(CONFIG_SMP) |
1244 | kdb_printf("on processor %d ", raw_smp_processor_id()); | |
1245 | #endif | |
1246 | } | |
1247 | ||
1248 | switch (reason) { | |
1249 | case KDB_REASON_DEBUG: | |
1250 | { | |
1251 | /* | |
1252 | * If re-entering kdb after a single step | |
1253 | * command, don't print the message. | |
1254 | */ | |
1255 | switch (db_result) { | |
1256 | case KDB_DB_BPT: | |
568fb6f4 | 1257 | kdb_printf("\nEntering kdb (0x%px, pid %d) ", |
5d5314d6 JW |
1258 | kdb_current, kdb_current->pid); |
1259 | #if defined(CONFIG_SMP) | |
1260 | kdb_printf("on processor %d ", raw_smp_processor_id()); | |
1261 | #endif | |
1262 | kdb_printf("due to Debug @ " kdb_machreg_fmt "\n", | |
1263 | instruction_pointer(regs)); | |
1264 | break; | |
5d5314d6 JW |
1265 | case KDB_DB_SS: |
1266 | break; | |
1267 | case KDB_DB_SSBPT: | |
1268 | KDB_DEBUG_STATE("kdb_local 4", reason); | |
1269 | return 1; /* kdba_db_trap did the work */ | |
1270 | default: | |
1271 | kdb_printf("kdb: Bad result from kdba_db_trap: %d\n", | |
1272 | db_result); | |
1273 | break; | |
1274 | } | |
1275 | ||
1276 | } | |
1277 | break; | |
1278 | case KDB_REASON_ENTER: | |
1279 | if (KDB_STATE(KEYBOARD)) | |
1280 | kdb_printf("due to Keyboard Entry\n"); | |
1281 | else | |
1282 | kdb_printf("due to KDB_ENTER()\n"); | |
1283 | break; | |
1284 | case KDB_REASON_KEYBOARD: | |
1285 | KDB_STATE_SET(KEYBOARD); | |
1286 | kdb_printf("due to Keyboard Entry\n"); | |
1287 | break; | |
1288 | case KDB_REASON_ENTER_SLAVE: | |
1289 | /* drop through, slaves only get released via cpu switch */ | |
1290 | case KDB_REASON_SWITCH: | |
1291 | kdb_printf("due to cpu switch\n"); | |
1292 | break; | |
1293 | case KDB_REASON_OOPS: | |
1294 | kdb_printf("Oops: %s\n", kdb_diemsg); | |
1295 | kdb_printf("due to oops @ " kdb_machreg_fmt "\n", | |
1296 | instruction_pointer(regs)); | |
1297 | kdb_dumpregs(regs); | |
1298 | break; | |
8daaa5f8 MT |
1299 | case KDB_REASON_SYSTEM_NMI: |
1300 | kdb_printf("due to System NonMaskable Interrupt\n"); | |
1301 | break; | |
5d5314d6 JW |
1302 | case KDB_REASON_NMI: |
1303 | kdb_printf("due to NonMaskable Interrupt @ " | |
1304 | kdb_machreg_fmt "\n", | |
1305 | instruction_pointer(regs)); | |
5d5314d6 JW |
1306 | break; |
1307 | case KDB_REASON_SSTEP: | |
1308 | case KDB_REASON_BREAK: | |
1309 | kdb_printf("due to %s @ " kdb_machreg_fmt "\n", | |
1310 | reason == KDB_REASON_BREAK ? | |
1311 | "Breakpoint" : "SS trap", instruction_pointer(regs)); | |
1312 | /* | |
1313 | * Determine if this breakpoint is one that we | |
1314 | * are interested in. | |
1315 | */ | |
1316 | if (db_result != KDB_DB_BPT) { | |
1317 | kdb_printf("kdb: error return from kdba_bp_trap: %d\n", | |
1318 | db_result); | |
1319 | KDB_DEBUG_STATE("kdb_local 6", reason); | |
1320 | return 0; /* Not for us, dismiss it */ | |
1321 | } | |
1322 | break; | |
1323 | case KDB_REASON_RECURSE: | |
1324 | kdb_printf("due to Recursion @ " kdb_machreg_fmt "\n", | |
1325 | instruction_pointer(regs)); | |
1326 | break; | |
1327 | default: | |
1328 | kdb_printf("kdb: unexpected reason code: %d\n", reason); | |
1329 | KDB_DEBUG_STATE("kdb_local 8", reason); | |
1330 | return 0; /* Not for us, dismiss it */ | |
1331 | } | |
1332 | ||
1333 | while (1) { | |
1334 | /* | |
1335 | * Initialize pager context. | |
1336 | */ | |
1337 | kdb_nextline = 1; | |
1338 | KDB_STATE_CLEAR(SUPPRESS); | |
ab08e464 | 1339 | kdb_grepping_flag = 0; |
fb6daa75 DT |
1340 | /* ensure the old search does not leak into '/' commands */ |
1341 | kdb_grep_string[0] = '\0'; | |
5d5314d6 JW |
1342 | |
1343 | cmdbuf = cmd_cur; | |
1344 | *cmdbuf = '\0'; | |
1345 | *(cmd_hist[cmd_head]) = '\0'; | |
1346 | ||
5d5314d6 | 1347 | do_full_getstr: |
ad99b510 | 1348 | /* PROMPT can only be set if we have MEM_READ permission. */ |
5d5314d6 JW |
1349 | snprintf(kdb_prompt_str, CMD_BUFLEN, kdbgetenv("PROMPT"), |
1350 | raw_smp_processor_id()); | |
5d5314d6 JW |
1351 | |
1352 | /* | |
1353 | * Fetch command from keyboard | |
1354 | */ | |
1355 | cmdbuf = kdb_getstr(cmdbuf, CMD_BUFLEN, kdb_prompt_str); | |
1356 | if (*cmdbuf != '\n') { | |
1357 | if (*cmdbuf < 32) { | |
1358 | if (cmdptr == cmd_head) { | |
d228bee8 | 1359 | strscpy(cmd_hist[cmd_head], cmd_cur, |
5d5314d6 JW |
1360 | CMD_BUFLEN); |
1361 | *(cmd_hist[cmd_head] + | |
1362 | strlen(cmd_hist[cmd_head])-1) = '\0'; | |
1363 | } | |
1364 | if (!handle_ctrl_cmd(cmdbuf)) | |
1365 | *(cmd_cur+strlen(cmd_cur)-1) = '\0'; | |
1366 | cmdbuf = cmd_cur; | |
1367 | goto do_full_getstr; | |
1368 | } else { | |
d228bee8 | 1369 | strscpy(cmd_hist[cmd_head], cmd_cur, |
5d5314d6 JW |
1370 | CMD_BUFLEN); |
1371 | } | |
1372 | ||
1373 | cmd_head = (cmd_head+1) % KDB_CMD_HISTORY_COUNT; | |
1374 | if (cmd_head == cmd_tail) | |
1375 | cmd_tail = (cmd_tail+1) % KDB_CMD_HISTORY_COUNT; | |
1376 | } | |
1377 | ||
1378 | cmdptr = cmd_head; | |
1379 | diag = kdb_parse(cmdbuf); | |
1380 | if (diag == KDB_NOTFOUND) { | |
b0f73bc7 | 1381 | drop_newline(cmdbuf); |
5d5314d6 JW |
1382 | kdb_printf("Unknown kdb command: '%s'\n", cmdbuf); |
1383 | diag = 0; | |
1384 | } | |
1385 | if (diag == KDB_CMD_GO | |
1386 | || diag == KDB_CMD_CPU | |
1387 | || diag == KDB_CMD_SS | |
5d5314d6 JW |
1388 | || diag == KDB_CMD_KGDB) |
1389 | break; | |
1390 | ||
1391 | if (diag) | |
1392 | kdb_cmderror(diag); | |
1393 | } | |
1394 | KDB_DEBUG_STATE("kdb_local 9", diag); | |
1395 | return diag; | |
1396 | } | |
1397 | ||
1398 | ||
1399 | /* | |
1400 | * kdb_print_state - Print the state data for the current processor | |
1401 | * for debugging. | |
1402 | * Inputs: | |
1403 | * text Identifies the debug point | |
1404 | * value Any integer value to be printed, e.g. reason code. | |
1405 | */ | |
1406 | void kdb_print_state(const char *text, int value) | |
1407 | { | |
1408 | kdb_printf("state: %s cpu %d value %d initial %d state %x\n", | |
1409 | text, raw_smp_processor_id(), value, kdb_initial_cpu, | |
1410 | kdb_state); | |
1411 | } | |
1412 | ||
1413 | /* | |
1414 | * kdb_main_loop - After initial setup and assignment of the | |
1415 | * controlling cpu, all cpus are in this loop. One cpu is in | |
1416 | * control and will issue the kdb prompt, the others will spin | |
1417 | * until 'go' or cpu switch. | |
1418 | * | |
1419 | * To get a consistent view of the kernel stacks for all | |
1420 | * processes, this routine is invoked from the main kdb code via | |
1421 | * an architecture specific routine. kdba_main_loop is | |
1422 | * responsible for making the kernel stacks consistent for all | |
1423 | * processes, there should be no difference between a blocked | |
1424 | * process and a running process as far as kdb is concerned. | |
1425 | * Inputs: | |
1426 | * reason The reason KDB was invoked | |
1427 | * error The hardware-defined error code | |
1428 | * reason2 kdb's current reason code. | |
1429 | * Initially error but can change | |
25985edc | 1430 | * according to kdb state. |
5d5314d6 JW |
1431 | * db_result Result code from break or debug point. |
1432 | * regs The exception frame at time of fault/breakpoint. | |
1433 | * should always be valid. | |
1434 | * Returns: | |
1435 | * 0 KDB was invoked for an event which it wasn't responsible | |
1436 | * 1 KDB handled the event for which it was invoked. | |
1437 | */ | |
1438 | int kdb_main_loop(kdb_reason_t reason, kdb_reason_t reason2, int error, | |
1439 | kdb_dbtrap_t db_result, struct pt_regs *regs) | |
1440 | { | |
1441 | int result = 1; | |
1442 | /* Stay in kdb() until 'go', 'ss[b]' or an error */ | |
1443 | while (1) { | |
1444 | /* | |
1445 | * All processors except the one that is in control | |
1446 | * will spin here. | |
1447 | */ | |
1448 | KDB_DEBUG_STATE("kdb_main_loop 1", reason); | |
1449 | while (KDB_STATE(HOLD_CPU)) { | |
1450 | /* state KDB is turned off by kdb_cpu to see if the | |
1451 | * other cpus are still live, each cpu in this loop | |
1452 | * turns it back on. | |
1453 | */ | |
1454 | if (!KDB_STATE(KDB)) | |
1455 | KDB_STATE_SET(KDB); | |
1456 | } | |
1457 | ||
1458 | KDB_STATE_CLEAR(SUPPRESS); | |
1459 | KDB_DEBUG_STATE("kdb_main_loop 2", reason); | |
1460 | if (KDB_STATE(LEAVING)) | |
1461 | break; /* Another cpu said 'go' */ | |
1462 | /* Still using kdb, this processor is in control */ | |
1463 | result = kdb_local(reason2, error, regs, db_result); | |
1464 | KDB_DEBUG_STATE("kdb_main_loop 3", result); | |
1465 | ||
1466 | if (result == KDB_CMD_CPU) | |
1467 | break; | |
1468 | ||
1469 | if (result == KDB_CMD_SS) { | |
1470 | KDB_STATE_SET(DOING_SS); | |
1471 | break; | |
1472 | } | |
1473 | ||
5d5314d6 | 1474 | if (result == KDB_CMD_KGDB) { |
d613d828 | 1475 | if (!KDB_STATE(DOING_KGDB)) |
5d5314d6 JW |
1476 | kdb_printf("Entering please attach debugger " |
1477 | "or use $D#44+ or $3#33\n"); | |
1478 | break; | |
1479 | } | |
1480 | if (result && result != 1 && result != KDB_CMD_GO) | |
1481 | kdb_printf("\nUnexpected kdb_local return code %d\n", | |
1482 | result); | |
1483 | KDB_DEBUG_STATE("kdb_main_loop 4", reason); | |
1484 | break; | |
1485 | } | |
1486 | if (KDB_STATE(DOING_SS)) | |
1487 | KDB_STATE_CLEAR(SSBPT); | |
1488 | ||
8f30d411 AW |
1489 | /* Clean up any keyboard devices before leaving */ |
1490 | kdb_kbd_cleanup_state(); | |
1491 | ||
5d5314d6 JW |
1492 | return result; |
1493 | } | |
1494 | ||
1495 | /* | |
1496 | * kdb_mdr - This function implements the guts of the 'mdr', memory | |
1497 | * read command. | |
1498 | * mdr <addr arg>,<byte count> | |
1499 | * Inputs: | |
1500 | * addr Start address | |
1501 | * count Number of bytes | |
1502 | * Returns: | |
1503 | * Always 0. Any errors are detected and printed by kdb_getarea. | |
1504 | */ | |
1505 | static int kdb_mdr(unsigned long addr, unsigned int count) | |
1506 | { | |
1507 | unsigned char c; | |
1508 | while (count--) { | |
1509 | if (kdb_getarea(c, addr)) | |
1510 | return 0; | |
1511 | kdb_printf("%02x", c); | |
1512 | addr++; | |
1513 | } | |
1514 | kdb_printf("\n"); | |
1515 | return 0; | |
1516 | } | |
1517 | ||
1518 | /* | |
1519 | * kdb_md - This function implements the 'md', 'md1', 'md2', 'md4', | |
1520 | * 'md8' 'mdr' and 'mds' commands. | |
1521 | * | |
1522 | * md|mds [<addr arg> [<line count> [<radix>]]] | |
1523 | * mdWcN [<addr arg> [<line count> [<radix>]]] | |
1524 | * where W = is the width (1, 2, 4 or 8) and N is the count. | |
1525 | * for eg., md1c20 reads 20 bytes, 1 at a time. | |
1526 | * mdr <addr arg>,<byte count> | |
1527 | */ | |
1528 | static void kdb_md_line(const char *fmtstr, unsigned long addr, | |
1529 | int symbolic, int nosect, int bytesperword, | |
1530 | int num, int repeat, int phys) | |
1531 | { | |
1532 | /* print just one line of data */ | |
1533 | kdb_symtab_t symtab; | |
1534 | char cbuf[32]; | |
1535 | char *c = cbuf; | |
1536 | int i; | |
9eb62f0e | 1537 | int j; |
5d5314d6 JW |
1538 | unsigned long word; |
1539 | ||
1540 | memset(cbuf, '\0', sizeof(cbuf)); | |
1541 | if (phys) | |
1542 | kdb_printf("phys " kdb_machreg_fmt0 " ", addr); | |
1543 | else | |
1544 | kdb_printf(kdb_machreg_fmt0 " ", addr); | |
1545 | ||
1546 | for (i = 0; i < num && repeat--; i++) { | |
1547 | if (phys) { | |
1548 | if (kdb_getphysword(&word, addr, bytesperword)) | |
1549 | break; | |
1550 | } else if (kdb_getword(&word, addr, bytesperword)) | |
1551 | break; | |
1552 | kdb_printf(fmtstr, word); | |
1553 | if (symbolic) | |
1554 | kdbnearsym(word, &symtab); | |
1555 | else | |
1556 | memset(&symtab, 0, sizeof(symtab)); | |
1557 | if (symtab.sym_name) { | |
1558 | kdb_symbol_print(word, &symtab, 0); | |
1559 | if (!nosect) { | |
1560 | kdb_printf("\n"); | |
1561 | kdb_printf(" %s %s " | |
1562 | kdb_machreg_fmt " " | |
1563 | kdb_machreg_fmt " " | |
1564 | kdb_machreg_fmt, symtab.mod_name, | |
1565 | symtab.sec_name, symtab.sec_start, | |
1566 | symtab.sym_start, symtab.sym_end); | |
1567 | } | |
1568 | addr += bytesperword; | |
1569 | } else { | |
1570 | union { | |
1571 | u64 word; | |
1572 | unsigned char c[8]; | |
1573 | } wc; | |
1574 | unsigned char *cp; | |
1575 | #ifdef __BIG_ENDIAN | |
1576 | cp = wc.c + 8 - bytesperword; | |
1577 | #else | |
1578 | cp = wc.c; | |
1579 | #endif | |
1580 | wc.word = word; | |
1581 | #define printable_char(c) \ | |
1582 | ({unsigned char __c = c; isascii(__c) && isprint(__c) ? __c : '.'; }) | |
9eb62f0e | 1583 | for (j = 0; j < bytesperword; j++) |
5d5314d6 | 1584 | *c++ = printable_char(*cp++); |
9eb62f0e | 1585 | addr += bytesperword; |
5d5314d6 JW |
1586 | #undef printable_char |
1587 | } | |
1588 | } | |
1589 | kdb_printf("%*s %s\n", (int)((num-i)*(2*bytesperword + 1)+1), | |
1590 | " ", cbuf); | |
1591 | } | |
1592 | ||
1593 | static int kdb_md(int argc, const char **argv) | |
1594 | { | |
1595 | static unsigned long last_addr; | |
1596 | static int last_radix, last_bytesperword, last_repeat; | |
1597 | int radix = 16, mdcount = 8, bytesperword = KDB_WORD_SIZE, repeat; | |
1598 | int nosect = 0; | |
1599 | char fmtchar, fmtstr[64]; | |
1600 | unsigned long addr; | |
1601 | unsigned long word; | |
1602 | long offset = 0; | |
1603 | int symbolic = 0; | |
1604 | int valid = 0; | |
1605 | int phys = 0; | |
1e0ce03b | 1606 | int raw = 0; |
5d5314d6 JW |
1607 | |
1608 | kdbgetintenv("MDCOUNT", &mdcount); | |
1609 | kdbgetintenv("RADIX", &radix); | |
1610 | kdbgetintenv("BYTESPERWORD", &bytesperword); | |
1611 | ||
1612 | /* Assume 'md <addr>' and start with environment values */ | |
1613 | repeat = mdcount * 16 / bytesperword; | |
1614 | ||
1615 | if (strcmp(argv[0], "mdr") == 0) { | |
1e0ce03b RD |
1616 | if (argc == 2 || (argc == 0 && last_addr != 0)) |
1617 | valid = raw = 1; | |
1618 | else | |
5d5314d6 | 1619 | return KDB_ARGCOUNT; |
5d5314d6 JW |
1620 | } else if (isdigit(argv[0][2])) { |
1621 | bytesperword = (int)(argv[0][2] - '0'); | |
1622 | if (bytesperword == 0) { | |
1623 | bytesperword = last_bytesperword; | |
1624 | if (bytesperword == 0) | |
1625 | bytesperword = 4; | |
1626 | } | |
1627 | last_bytesperword = bytesperword; | |
1628 | repeat = mdcount * 16 / bytesperword; | |
1629 | if (!argv[0][3]) | |
1630 | valid = 1; | |
1631 | else if (argv[0][3] == 'c' && argv[0][4]) { | |
1632 | char *p; | |
1633 | repeat = simple_strtoul(argv[0] + 4, &p, 10); | |
1634 | mdcount = ((repeat * bytesperword) + 15) / 16; | |
1635 | valid = !*p; | |
1636 | } | |
1637 | last_repeat = repeat; | |
1638 | } else if (strcmp(argv[0], "md") == 0) | |
1639 | valid = 1; | |
1640 | else if (strcmp(argv[0], "mds") == 0) | |
1641 | valid = 1; | |
1642 | else if (strcmp(argv[0], "mdp") == 0) { | |
1643 | phys = valid = 1; | |
1644 | } | |
1645 | if (!valid) | |
1646 | return KDB_NOTFOUND; | |
1647 | ||
1648 | if (argc == 0) { | |
1649 | if (last_addr == 0) | |
1650 | return KDB_ARGCOUNT; | |
1651 | addr = last_addr; | |
1652 | radix = last_radix; | |
1653 | bytesperword = last_bytesperword; | |
1654 | repeat = last_repeat; | |
1e0ce03b RD |
1655 | if (raw) |
1656 | mdcount = repeat; | |
1657 | else | |
1658 | mdcount = ((repeat * bytesperword) + 15) / 16; | |
5d5314d6 JW |
1659 | } |
1660 | ||
1661 | if (argc) { | |
1662 | unsigned long val; | |
1663 | int diag, nextarg = 1; | |
1664 | diag = kdbgetaddrarg(argc, argv, &nextarg, &addr, | |
1665 | &offset, NULL); | |
1666 | if (diag) | |
1667 | return diag; | |
1668 | if (argc > nextarg+2) | |
1669 | return KDB_ARGCOUNT; | |
1670 | ||
1671 | if (argc >= nextarg) { | |
1672 | diag = kdbgetularg(argv[nextarg], &val); | |
1673 | if (!diag) { | |
1674 | mdcount = (int) val; | |
1e0ce03b RD |
1675 | if (raw) |
1676 | repeat = mdcount; | |
1677 | else | |
1678 | repeat = mdcount * 16 / bytesperword; | |
5d5314d6 JW |
1679 | } |
1680 | } | |
1681 | if (argc >= nextarg+1) { | |
1682 | diag = kdbgetularg(argv[nextarg+1], &val); | |
1683 | if (!diag) | |
1684 | radix = (int) val; | |
1685 | } | |
1686 | } | |
1687 | ||
1e0ce03b RD |
1688 | if (strcmp(argv[0], "mdr") == 0) { |
1689 | int ret; | |
1690 | last_addr = addr; | |
1691 | ret = kdb_mdr(addr, mdcount); | |
1692 | last_addr += mdcount; | |
1693 | last_repeat = mdcount; | |
1694 | last_bytesperword = bytesperword; // to make REPEAT happy | |
1695 | return ret; | |
1696 | } | |
5d5314d6 JW |
1697 | |
1698 | switch (radix) { | |
1699 | case 10: | |
1700 | fmtchar = 'd'; | |
1701 | break; | |
1702 | case 16: | |
1703 | fmtchar = 'x'; | |
1704 | break; | |
1705 | case 8: | |
1706 | fmtchar = 'o'; | |
1707 | break; | |
1708 | default: | |
1709 | return KDB_BADRADIX; | |
1710 | } | |
1711 | ||
1712 | last_radix = radix; | |
1713 | ||
1714 | if (bytesperword > KDB_WORD_SIZE) | |
1715 | return KDB_BADWIDTH; | |
1716 | ||
1717 | switch (bytesperword) { | |
1718 | case 8: | |
1719 | sprintf(fmtstr, "%%16.16l%c ", fmtchar); | |
1720 | break; | |
1721 | case 4: | |
1722 | sprintf(fmtstr, "%%8.8l%c ", fmtchar); | |
1723 | break; | |
1724 | case 2: | |
1725 | sprintf(fmtstr, "%%4.4l%c ", fmtchar); | |
1726 | break; | |
1727 | case 1: | |
1728 | sprintf(fmtstr, "%%2.2l%c ", fmtchar); | |
1729 | break; | |
1730 | default: | |
1731 | return KDB_BADWIDTH; | |
1732 | } | |
1733 | ||
1734 | last_repeat = repeat; | |
1735 | last_bytesperword = bytesperword; | |
1736 | ||
1737 | if (strcmp(argv[0], "mds") == 0) { | |
1738 | symbolic = 1; | |
1739 | /* Do not save these changes as last_*, they are temporary mds | |
1740 | * overrides. | |
1741 | */ | |
1742 | bytesperword = KDB_WORD_SIZE; | |
1743 | repeat = mdcount; | |
1744 | kdbgetintenv("NOSECT", &nosect); | |
1745 | } | |
1746 | ||
1747 | /* Round address down modulo BYTESPERWORD */ | |
1748 | ||
1749 | addr &= ~(bytesperword-1); | |
1750 | ||
1751 | while (repeat > 0) { | |
1752 | unsigned long a; | |
1753 | int n, z, num = (symbolic ? 1 : (16 / bytesperword)); | |
1754 | ||
1755 | if (KDB_FLAG(CMD_INTERRUPT)) | |
1756 | return 0; | |
1757 | for (a = addr, z = 0; z < repeat; a += bytesperword, ++z) { | |
1758 | if (phys) { | |
1759 | if (kdb_getphysword(&word, a, bytesperword) | |
1760 | || word) | |
1761 | break; | |
1762 | } else if (kdb_getword(&word, a, bytesperword) || word) | |
1763 | break; | |
1764 | } | |
1765 | n = min(num, repeat); | |
1766 | kdb_md_line(fmtstr, addr, symbolic, nosect, bytesperword, | |
1767 | num, repeat, phys); | |
1768 | addr += bytesperword * n; | |
1769 | repeat -= n; | |
1770 | z = (z + num - 1) / num; | |
1771 | if (z > 2) { | |
1772 | int s = num * (z-2); | |
1773 | kdb_printf(kdb_machreg_fmt0 "-" kdb_machreg_fmt0 | |
1774 | " zero suppressed\n", | |
1775 | addr, addr + bytesperword * s - 1); | |
1776 | addr += bytesperword * s; | |
1777 | repeat -= s; | |
1778 | } | |
1779 | } | |
1780 | last_addr = addr; | |
1781 | ||
1782 | return 0; | |
1783 | } | |
1784 | ||
1785 | /* | |
1786 | * kdb_mm - This function implements the 'mm' command. | |
1787 | * mm address-expression new-value | |
1788 | * Remarks: | |
1789 | * mm works on machine words, mmW works on bytes. | |
1790 | */ | |
1791 | static int kdb_mm(int argc, const char **argv) | |
1792 | { | |
1793 | int diag; | |
1794 | unsigned long addr; | |
1795 | long offset = 0; | |
1796 | unsigned long contents; | |
1797 | int nextarg; | |
1798 | int width; | |
1799 | ||
1800 | if (argv[0][2] && !isdigit(argv[0][2])) | |
1801 | return KDB_NOTFOUND; | |
1802 | ||
1803 | if (argc < 2) | |
1804 | return KDB_ARGCOUNT; | |
1805 | ||
1806 | nextarg = 1; | |
1807 | diag = kdbgetaddrarg(argc, argv, &nextarg, &addr, &offset, NULL); | |
1808 | if (diag) | |
1809 | return diag; | |
1810 | ||
1811 | if (nextarg > argc) | |
1812 | return KDB_ARGCOUNT; | |
1813 | diag = kdbgetaddrarg(argc, argv, &nextarg, &contents, NULL, NULL); | |
1814 | if (diag) | |
1815 | return diag; | |
1816 | ||
1817 | if (nextarg != argc + 1) | |
1818 | return KDB_ARGCOUNT; | |
1819 | ||
1820 | width = argv[0][2] ? (argv[0][2] - '0') : (KDB_WORD_SIZE); | |
1821 | diag = kdb_putword(addr, contents, width); | |
1822 | if (diag) | |
1823 | return diag; | |
1824 | ||
1825 | kdb_printf(kdb_machreg_fmt " = " kdb_machreg_fmt "\n", addr, contents); | |
1826 | ||
1827 | return 0; | |
1828 | } | |
1829 | ||
1830 | /* | |
1831 | * kdb_go - This function implements the 'go' command. | |
1832 | * go [address-expression] | |
1833 | */ | |
1834 | static int kdb_go(int argc, const char **argv) | |
1835 | { | |
1836 | unsigned long addr; | |
1837 | int diag; | |
1838 | int nextarg; | |
1839 | long offset; | |
1840 | ||
495363d3 JW |
1841 | if (raw_smp_processor_id() != kdb_initial_cpu) { |
1842 | kdb_printf("go must execute on the entry cpu, " | |
1843 | "please use \"cpu %d\" and then execute go\n", | |
1844 | kdb_initial_cpu); | |
1845 | return KDB_BADCPUNUM; | |
1846 | } | |
5d5314d6 | 1847 | if (argc == 1) { |
5d5314d6 JW |
1848 | nextarg = 1; |
1849 | diag = kdbgetaddrarg(argc, argv, &nextarg, | |
1850 | &addr, &offset, NULL); | |
1851 | if (diag) | |
1852 | return diag; | |
1853 | } else if (argc) { | |
1854 | return KDB_ARGCOUNT; | |
1855 | } | |
1856 | ||
1857 | diag = KDB_CMD_GO; | |
1858 | if (KDB_FLAG(CATASTROPHIC)) { | |
1859 | kdb_printf("Catastrophic error detected\n"); | |
1860 | kdb_printf("kdb_continue_catastrophic=%d, ", | |
1861 | kdb_continue_catastrophic); | |
1862 | if (kdb_continue_catastrophic == 0 && kdb_go_count++ == 0) { | |
1863 | kdb_printf("type go a second time if you really want " | |
1864 | "to continue\n"); | |
1865 | return 0; | |
1866 | } | |
1867 | if (kdb_continue_catastrophic == 2) { | |
1868 | kdb_printf("forcing reboot\n"); | |
1869 | kdb_reboot(0, NULL); | |
1870 | } | |
1871 | kdb_printf("attempting to continue\n"); | |
1872 | } | |
1873 | return diag; | |
1874 | } | |
1875 | ||
1876 | /* | |
1877 | * kdb_rd - This function implements the 'rd' command. | |
1878 | */ | |
1879 | static int kdb_rd(int argc, const char **argv) | |
1880 | { | |
fcf2736c DT |
1881 | int len = kdb_check_regs(); |
1882 | #if DBG_MAX_REG_NUM > 0 | |
534af108 JW |
1883 | int i; |
1884 | char *rname; | |
1885 | int rsize; | |
1886 | u64 reg64; | |
1887 | u32 reg32; | |
1888 | u16 reg16; | |
1889 | u8 reg8; | |
1890 | ||
fcf2736c DT |
1891 | if (len) |
1892 | return len; | |
534af108 JW |
1893 | |
1894 | for (i = 0; i < DBG_MAX_REG_NUM; i++) { | |
1895 | rsize = dbg_reg_def[i].size * 2; | |
1896 | if (rsize > 16) | |
1897 | rsize = 2; | |
1898 | if (len + strlen(dbg_reg_def[i].name) + 4 + rsize > 80) { | |
1899 | len = 0; | |
1900 | kdb_printf("\n"); | |
1901 | } | |
1902 | if (len) | |
1903 | len += kdb_printf(" "); | |
1904 | switch(dbg_reg_def[i].size * 8) { | |
1905 | case 8: | |
1906 | rname = dbg_get_reg(i, ®8, kdb_current_regs); | |
1907 | if (!rname) | |
1908 | break; | |
1909 | len += kdb_printf("%s: %02x", rname, reg8); | |
1910 | break; | |
1911 | case 16: | |
1912 | rname = dbg_get_reg(i, ®16, kdb_current_regs); | |
1913 | if (!rname) | |
1914 | break; | |
1915 | len += kdb_printf("%s: %04x", rname, reg16); | |
1916 | break; | |
1917 | case 32: | |
1918 | rname = dbg_get_reg(i, ®32, kdb_current_regs); | |
1919 | if (!rname) | |
1920 | break; | |
1921 | len += kdb_printf("%s: %08x", rname, reg32); | |
1922 | break; | |
1923 | case 64: | |
1924 | rname = dbg_get_reg(i, ®64, kdb_current_regs); | |
1925 | if (!rname) | |
1926 | break; | |
1927 | len += kdb_printf("%s: %016llx", rname, reg64); | |
1928 | break; | |
1929 | default: | |
1930 | len += kdb_printf("%s: ??", dbg_reg_def[i].name); | |
1931 | } | |
1932 | } | |
1933 | kdb_printf("\n"); | |
fcf2736c DT |
1934 | #else |
1935 | if (len) | |
1936 | return len; | |
5d5314d6 | 1937 | |
fcf2736c DT |
1938 | kdb_dumpregs(kdb_current_regs); |
1939 | #endif | |
5d5314d6 JW |
1940 | return 0; |
1941 | } | |
1942 | ||
1943 | /* | |
1944 | * kdb_rm - This function implements the 'rm' (register modify) command. | |
1945 | * rm register-name new-contents | |
1946 | * Remarks: | |
534af108 | 1947 | * Allows register modification with the same restrictions as gdb |
5d5314d6 JW |
1948 | */ |
1949 | static int kdb_rm(int argc, const char **argv) | |
1950 | { | |
534af108 | 1951 | #if DBG_MAX_REG_NUM > 0 |
5d5314d6 | 1952 | int diag; |
534af108 JW |
1953 | const char *rname; |
1954 | int i; | |
1955 | u64 reg64; | |
1956 | u32 reg32; | |
1957 | u16 reg16; | |
1958 | u8 reg8; | |
5d5314d6 JW |
1959 | |
1960 | if (argc != 2) | |
1961 | return KDB_ARGCOUNT; | |
1962 | /* | |
1963 | * Allow presence or absence of leading '%' symbol. | |
1964 | */ | |
534af108 JW |
1965 | rname = argv[1]; |
1966 | if (*rname == '%') | |
1967 | rname++; | |
5d5314d6 | 1968 | |
534af108 | 1969 | diag = kdbgetu64arg(argv[2], ®64); |
5d5314d6 JW |
1970 | if (diag) |
1971 | return diag; | |
1972 | ||
fcf2736c DT |
1973 | diag = kdb_check_regs(); |
1974 | if (diag) | |
1975 | return diag; | |
534af108 JW |
1976 | |
1977 | diag = KDB_BADREG; | |
1978 | for (i = 0; i < DBG_MAX_REG_NUM; i++) { | |
1979 | if (strcmp(rname, dbg_reg_def[i].name) == 0) { | |
1980 | diag = 0; | |
1981 | break; | |
1982 | } | |
1983 | } | |
1984 | if (!diag) { | |
1985 | switch(dbg_reg_def[i].size * 8) { | |
1986 | case 8: | |
1987 | reg8 = reg64; | |
1988 | dbg_set_reg(i, ®8, kdb_current_regs); | |
1989 | break; | |
1990 | case 16: | |
1991 | reg16 = reg64; | |
1992 | dbg_set_reg(i, ®16, kdb_current_regs); | |
1993 | break; | |
1994 | case 32: | |
1995 | reg32 = reg64; | |
1996 | dbg_set_reg(i, ®32, kdb_current_regs); | |
1997 | break; | |
1998 | case 64: | |
1999 | dbg_set_reg(i, ®64, kdb_current_regs); | |
2000 | break; | |
2001 | } | |
2002 | } | |
2003 | return diag; | |
2004 | #else | |
5d5314d6 | 2005 | kdb_printf("ERROR: Register set currently not implemented\n"); |
534af108 JW |
2006 | return 0; |
2007 | #endif | |
5d5314d6 JW |
2008 | } |
2009 | ||
2010 | #if defined(CONFIG_MAGIC_SYSRQ) | |
2011 | /* | |
2012 | * kdb_sr - This function implements the 'sr' (SYSRQ key) command | |
2013 | * which interfaces to the soi-disant MAGIC SYSRQ functionality. | |
2014 | * sr <magic-sysrq-code> | |
2015 | */ | |
2016 | static int kdb_sr(int argc, const char **argv) | |
2017 | { | |
420c2b1b AV |
2018 | bool check_mask = |
2019 | !kdb_check_flags(KDB_ENABLE_ALL, kdb_cmd_enabled, false); | |
2020 | ||
5d5314d6 JW |
2021 | if (argc != 1) |
2022 | return KDB_ARGCOUNT; | |
420c2b1b | 2023 | |
d37d39ae | 2024 | kdb_trap_printk++; |
420c2b1b | 2025 | __handle_sysrq(*argv[1], check_mask); |
d37d39ae | 2026 | kdb_trap_printk--; |
5d5314d6 JW |
2027 | |
2028 | return 0; | |
2029 | } | |
2030 | #endif /* CONFIG_MAGIC_SYSRQ */ | |
2031 | ||
2032 | /* | |
2033 | * kdb_ef - This function implements the 'regs' (display exception | |
2034 | * frame) command. This command takes an address and expects to | |
2035 | * find an exception frame at that address, formats and prints | |
2036 | * it. | |
2037 | * regs address-expression | |
2038 | * Remarks: | |
2039 | * Not done yet. | |
2040 | */ | |
2041 | static int kdb_ef(int argc, const char **argv) | |
2042 | { | |
2043 | int diag; | |
2044 | unsigned long addr; | |
2045 | long offset; | |
2046 | int nextarg; | |
2047 | ||
2048 | if (argc != 1) | |
2049 | return KDB_ARGCOUNT; | |
2050 | ||
2051 | nextarg = 1; | |
2052 | diag = kdbgetaddrarg(argc, argv, &nextarg, &addr, &offset, NULL); | |
2053 | if (diag) | |
2054 | return diag; | |
2055 | show_regs((struct pt_regs *)addr); | |
2056 | return 0; | |
2057 | } | |
2058 | ||
5d5314d6 JW |
2059 | /* |
2060 | * kdb_env - This function implements the 'env' command. Display the | |
2061 | * current environment variables. | |
2062 | */ | |
2063 | ||
2064 | static int kdb_env(int argc, const char **argv) | |
2065 | { | |
83fa2d13 | 2066 | kdb_printenv(); |
5d5314d6 JW |
2067 | |
2068 | if (KDB_DEBUG(MASK)) | |
c893de12 WL |
2069 | kdb_printf("KDBDEBUG=0x%x\n", |
2070 | (kdb_flags & KDB_DEBUG(MASK)) >> KDB_DEBUG_FLAG_SHIFT); | |
5d5314d6 JW |
2071 | |
2072 | return 0; | |
2073 | } | |
2074 | ||
2075 | #ifdef CONFIG_PRINTK | |
2076 | /* | |
2077 | * kdb_dmesg - This function implements the 'dmesg' command to display | |
2078 | * the contents of the syslog buffer. | |
2079 | * dmesg [lines] [adjust] | |
2080 | */ | |
2081 | static int kdb_dmesg(int argc, const char **argv) | |
2082 | { | |
bc792e61 AV |
2083 | int diag; |
2084 | int logging; | |
2085 | int lines = 0; | |
2086 | int adjust = 0; | |
2087 | int n = 0; | |
2088 | int skip = 0; | |
f9f3f02d | 2089 | struct kmsg_dump_iter iter; |
bc792e61 AV |
2090 | size_t len; |
2091 | char buf[201]; | |
5d5314d6 JW |
2092 | |
2093 | if (argc > 2) | |
2094 | return KDB_ARGCOUNT; | |
2095 | if (argc) { | |
2096 | char *cp; | |
2097 | lines = simple_strtol(argv[1], &cp, 0); | |
2098 | if (*cp) | |
2099 | lines = 0; | |
2100 | if (argc > 1) { | |
2101 | adjust = simple_strtoul(argv[2], &cp, 0); | |
2102 | if (*cp || adjust < 0) | |
2103 | adjust = 0; | |
2104 | } | |
2105 | } | |
2106 | ||
2107 | /* disable LOGGING if set */ | |
2108 | diag = kdbgetintenv("LOGGING", &logging); | |
2109 | if (!diag && logging) { | |
2110 | const char *setargs[] = { "set", "LOGGING", "0" }; | |
2111 | kdb_set(2, setargs); | |
2112 | } | |
2113 | ||
a4f98765 JO |
2114 | kmsg_dump_rewind(&iter); |
2115 | while (kmsg_dump_get_line(&iter, 1, NULL, 0, NULL)) | |
bc792e61 AV |
2116 | n++; |
2117 | ||
5d5314d6 JW |
2118 | if (lines < 0) { |
2119 | if (adjust >= n) | |
2120 | kdb_printf("buffer only contains %d lines, nothing " | |
2121 | "printed\n", n); | |
2122 | else if (adjust - lines >= n) | |
2123 | kdb_printf("buffer only contains %d lines, last %d " | |
2124 | "lines printed\n", n, n - adjust); | |
bc792e61 AV |
2125 | skip = adjust; |
2126 | lines = abs(lines); | |
5d5314d6 | 2127 | } else if (lines > 0) { |
bc792e61 AV |
2128 | skip = n - lines - adjust; |
2129 | lines = abs(lines); | |
5d5314d6 JW |
2130 | if (adjust >= n) { |
2131 | kdb_printf("buffer only contains %d lines, " | |
2132 | "nothing printed\n", n); | |
2133 | skip = n; | |
2134 | } else if (skip < 0) { | |
2135 | lines += skip; | |
2136 | skip = 0; | |
2137 | kdb_printf("buffer only contains %d lines, first " | |
2138 | "%d lines printed\n", n, lines); | |
2139 | } | |
bc792e61 AV |
2140 | } else { |
2141 | lines = n; | |
5d5314d6 | 2142 | } |
bc792e61 AV |
2143 | |
2144 | if (skip >= n || skip < 0) | |
2145 | return 0; | |
2146 | ||
a4f98765 JO |
2147 | kmsg_dump_rewind(&iter); |
2148 | while (kmsg_dump_get_line(&iter, 1, buf, sizeof(buf), &len)) { | |
bc792e61 AV |
2149 | if (skip) { |
2150 | skip--; | |
2151 | continue; | |
5d5314d6 | 2152 | } |
bc792e61 AV |
2153 | if (!lines--) |
2154 | break; | |
d1871b38 JW |
2155 | if (KDB_FLAG(CMD_INTERRUPT)) |
2156 | return 0; | |
bc792e61 AV |
2157 | |
2158 | kdb_printf("%.*s\n", (int)len - 1, buf); | |
5d5314d6 | 2159 | } |
5d5314d6 JW |
2160 | |
2161 | return 0; | |
2162 | } | |
2163 | #endif /* CONFIG_PRINTK */ | |
ad394f66 AV |
2164 | |
2165 | /* Make sure we balance enable/disable calls, must disable first. */ | |
2166 | static atomic_t kdb_nmi_disabled; | |
2167 | ||
2168 | static int kdb_disable_nmi(int argc, const char *argv[]) | |
2169 | { | |
2170 | if (atomic_read(&kdb_nmi_disabled)) | |
2171 | return 0; | |
2172 | atomic_set(&kdb_nmi_disabled, 1); | |
2173 | arch_kgdb_ops.enable_nmi(0); | |
2174 | return 0; | |
2175 | } | |
2176 | ||
2177 | static int kdb_param_enable_nmi(const char *val, const struct kernel_param *kp) | |
2178 | { | |
2179 | if (!atomic_add_unless(&kdb_nmi_disabled, -1, 0)) | |
2180 | return -EINVAL; | |
2181 | arch_kgdb_ops.enable_nmi(1); | |
2182 | return 0; | |
2183 | } | |
2184 | ||
2185 | static const struct kernel_param_ops kdb_param_ops_enable_nmi = { | |
2186 | .set = kdb_param_enable_nmi, | |
2187 | }; | |
2188 | module_param_cb(enable_nmi, &kdb_param_ops_enable_nmi, NULL, 0600); | |
2189 | ||
5d5314d6 JW |
2190 | /* |
2191 | * kdb_cpu - This function implements the 'cpu' command. | |
2192 | * cpu [<cpunum>] | |
2193 | * Returns: | |
2194 | * KDB_CMD_CPU for success, a kdb diagnostic if error | |
2195 | */ | |
2196 | static void kdb_cpu_status(void) | |
2197 | { | |
2198 | int i, start_cpu, first_print = 1; | |
2199 | char state, prev_state = '?'; | |
2200 | ||
2201 | kdb_printf("Currently on cpu %d\n", raw_smp_processor_id()); | |
2202 | kdb_printf("Available cpus: "); | |
2203 | for (start_cpu = -1, i = 0; i < NR_CPUS; i++) { | |
2204 | if (!cpu_online(i)) { | |
2205 | state = 'F'; /* cpu is offline */ | |
a1465d2f DT |
2206 | } else if (!kgdb_info[i].enter_kgdb) { |
2207 | state = 'D'; /* cpu is online but unresponsive */ | |
5d5314d6 JW |
2208 | } else { |
2209 | state = ' '; /* cpu is responding to kdb */ | |
b77dbc86 DT |
2210 | if (kdb_task_state_char(KDB_TSK(i)) == '-') |
2211 | state = '-'; /* idle task */ | |
5d5314d6 JW |
2212 | } |
2213 | if (state != prev_state) { | |
2214 | if (prev_state != '?') { | |
2215 | if (!first_print) | |
2216 | kdb_printf(", "); | |
2217 | first_print = 0; | |
2218 | kdb_printf("%d", start_cpu); | |
2219 | if (start_cpu < i-1) | |
2220 | kdb_printf("-%d", i-1); | |
2221 | if (prev_state != ' ') | |
2222 | kdb_printf("(%c)", prev_state); | |
2223 | } | |
2224 | prev_state = state; | |
2225 | start_cpu = i; | |
2226 | } | |
2227 | } | |
2228 | /* print the trailing cpus, ignoring them if they are all offline */ | |
2229 | if (prev_state != 'F') { | |
2230 | if (!first_print) | |
2231 | kdb_printf(", "); | |
2232 | kdb_printf("%d", start_cpu); | |
2233 | if (start_cpu < i-1) | |
2234 | kdb_printf("-%d", i-1); | |
2235 | if (prev_state != ' ') | |
2236 | kdb_printf("(%c)", prev_state); | |
2237 | } | |
2238 | kdb_printf("\n"); | |
2239 | } | |
2240 | ||
2241 | static int kdb_cpu(int argc, const char **argv) | |
2242 | { | |
2243 | unsigned long cpunum; | |
2244 | int diag; | |
2245 | ||
2246 | if (argc == 0) { | |
2247 | kdb_cpu_status(); | |
2248 | return 0; | |
2249 | } | |
2250 | ||
2251 | if (argc != 1) | |
2252 | return KDB_ARGCOUNT; | |
2253 | ||
2254 | diag = kdbgetularg(argv[1], &cpunum); | |
2255 | if (diag) | |
2256 | return diag; | |
2257 | ||
2258 | /* | |
2259 | * Validate cpunum | |
2260 | */ | |
df0036d1 | 2261 | if ((cpunum >= CONFIG_NR_CPUS) || !kgdb_info[cpunum].enter_kgdb) |
5d5314d6 JW |
2262 | return KDB_BADCPUNUM; |
2263 | ||
2264 | dbg_switch_cpu = cpunum; | |
2265 | ||
2266 | /* | |
2267 | * Switch to other cpu | |
2268 | */ | |
2269 | return KDB_CMD_CPU; | |
2270 | } | |
2271 | ||
2272 | /* The user may not realize that ps/bta with no parameters does not print idle | |
2273 | * or sleeping system daemon processes, so tell them how many were suppressed. | |
2274 | */ | |
2275 | void kdb_ps_suppressed(void) | |
2276 | { | |
2277 | int idle = 0, daemon = 0; | |
5d5314d6 JW |
2278 | unsigned long cpu; |
2279 | const struct task_struct *p, *g; | |
2280 | for_each_online_cpu(cpu) { | |
2281 | p = kdb_curr_task(cpu); | |
b77dbc86 | 2282 | if (kdb_task_state(p, "-")) |
5d5314d6 JW |
2283 | ++idle; |
2284 | } | |
ece4ceaf | 2285 | for_each_process_thread(g, p) { |
b77dbc86 | 2286 | if (kdb_task_state(p, "ims")) |
5d5314d6 | 2287 | ++daemon; |
ece4ceaf | 2288 | } |
5d5314d6 JW |
2289 | if (idle || daemon) { |
2290 | if (idle) | |
b77dbc86 | 2291 | kdb_printf("%d idle process%s (state -)%s\n", |
5d5314d6 JW |
2292 | idle, idle == 1 ? "" : "es", |
2293 | daemon ? " and " : ""); | |
2294 | if (daemon) | |
b77dbc86 | 2295 | kdb_printf("%d sleeping system daemon (state [ims]) " |
5d5314d6 JW |
2296 | "process%s", daemon, |
2297 | daemon == 1 ? "" : "es"); | |
2298 | kdb_printf(" suppressed,\nuse 'ps A' to see all.\n"); | |
2299 | } | |
2300 | } | |
2301 | ||
5d5314d6 JW |
2302 | void kdb_ps1(const struct task_struct *p) |
2303 | { | |
2304 | int cpu; | |
2305 | unsigned long tmp; | |
2306 | ||
fe557319 CH |
2307 | if (!p || |
2308 | copy_from_kernel_nofault(&tmp, (char *)p, sizeof(unsigned long))) | |
5d5314d6 JW |
2309 | return; |
2310 | ||
2311 | cpu = kdb_process_cpu(p); | |
568fb6f4 | 2312 | kdb_printf("0x%px %8d %8d %d %4d %c 0x%px %c%s\n", |
5d5314d6 JW |
2313 | (void *)p, p->pid, p->parent->pid, |
2314 | kdb_task_has_cpu(p), kdb_process_cpu(p), | |
2315 | kdb_task_state_char(p), | |
2316 | (void *)(&p->thread), | |
2317 | p == kdb_curr_task(raw_smp_processor_id()) ? '*' : ' ', | |
2318 | p->comm); | |
2319 | if (kdb_task_has_cpu(p)) { | |
2320 | if (!KDB_TSK(cpu)) { | |
2321 | kdb_printf(" Error: no saved data for this cpu\n"); | |
2322 | } else { | |
2323 | if (KDB_TSK(cpu) != p) | |
2324 | kdb_printf(" Error: does not match running " | |
568fb6f4 | 2325 | "process table (0x%px)\n", KDB_TSK(cpu)); |
5d5314d6 JW |
2326 | } |
2327 | } | |
2328 | } | |
2329 | ||
b77dbc86 DT |
2330 | /* |
2331 | * kdb_ps - This function implements the 'ps' command which shows a | |
2332 | * list of the active processes. | |
2333 | * | |
2334 | * ps [<state_chars>] Show processes, optionally selecting only those whose | |
2335 | * state character is found in <state_chars>. | |
2336 | */ | |
5d5314d6 JW |
2337 | static int kdb_ps(int argc, const char **argv) |
2338 | { | |
2339 | struct task_struct *g, *p; | |
b77dbc86 DT |
2340 | const char *mask; |
2341 | unsigned long cpu; | |
5d5314d6 JW |
2342 | |
2343 | if (argc == 0) | |
2344 | kdb_ps_suppressed(); | |
2345 | kdb_printf("%-*s Pid Parent [*] cpu State %-*s Command\n", | |
2346 | (int)(2*sizeof(void *))+2, "Task Addr", | |
2347 | (int)(2*sizeof(void *))+2, "Thread"); | |
b77dbc86 | 2348 | mask = argc ? argv[1] : kdbgetenv("PS"); |
5d5314d6 JW |
2349 | /* Run the active tasks first */ |
2350 | for_each_online_cpu(cpu) { | |
2351 | if (KDB_FLAG(CMD_INTERRUPT)) | |
2352 | return 0; | |
2353 | p = kdb_curr_task(cpu); | |
2354 | if (kdb_task_state(p, mask)) | |
2355 | kdb_ps1(p); | |
2356 | } | |
2357 | kdb_printf("\n"); | |
2358 | /* Now the real tasks */ | |
ece4ceaf | 2359 | for_each_process_thread(g, p) { |
5d5314d6 JW |
2360 | if (KDB_FLAG(CMD_INTERRUPT)) |
2361 | return 0; | |
2362 | if (kdb_task_state(p, mask)) | |
2363 | kdb_ps1(p); | |
ece4ceaf | 2364 | } |
5d5314d6 JW |
2365 | |
2366 | return 0; | |
2367 | } | |
2368 | ||
2369 | /* | |
2370 | * kdb_pid - This function implements the 'pid' command which switches | |
2371 | * the currently active process. | |
2372 | * pid [<pid> | R] | |
2373 | */ | |
2374 | static int kdb_pid(int argc, const char **argv) | |
2375 | { | |
2376 | struct task_struct *p; | |
2377 | unsigned long val; | |
2378 | int diag; | |
2379 | ||
2380 | if (argc > 1) | |
2381 | return KDB_ARGCOUNT; | |
2382 | ||
2383 | if (argc) { | |
2384 | if (strcmp(argv[1], "R") == 0) { | |
2385 | p = KDB_TSK(kdb_initial_cpu); | |
2386 | } else { | |
2387 | diag = kdbgetularg(argv[1], &val); | |
2388 | if (diag) | |
2389 | return KDB_BADINT; | |
2390 | ||
2391 | p = find_task_by_pid_ns((pid_t)val, &init_pid_ns); | |
2392 | if (!p) { | |
2393 | kdb_printf("No task with pid=%d\n", (pid_t)val); | |
2394 | return 0; | |
2395 | } | |
2396 | } | |
2397 | kdb_set_current_task(p); | |
2398 | } | |
2399 | kdb_printf("KDB current process is %s(pid=%d)\n", | |
2400 | kdb_current_task->comm, | |
2401 | kdb_current_task->pid); | |
2402 | ||
2403 | return 0; | |
2404 | } | |
2405 | ||
5d5314d6 JW |
2406 | static int kdb_kgdb(int argc, const char **argv) |
2407 | { | |
2408 | return KDB_CMD_KGDB; | |
2409 | } | |
2410 | ||
2411 | /* | |
2412 | * kdb_help - This function implements the 'help' and '?' commands. | |
2413 | */ | |
2414 | static int kdb_help(int argc, const char **argv) | |
2415 | { | |
2416 | kdbtab_t *kt; | |
5d5314d6 JW |
2417 | |
2418 | kdb_printf("%-15.15s %-20.20s %s\n", "Command", "Usage", "Description"); | |
2419 | kdb_printf("-----------------------------" | |
2420 | "-----------------------------\n"); | |
e4f291b3 | 2421 | list_for_each_entry(kt, &kdb_cmds_head, list_node) { |
074604af | 2422 | char *space = ""; |
5d5314d6 JW |
2423 | if (KDB_FLAG(CMD_INTERRUPT)) |
2424 | return 0; | |
e868f0a3 | 2425 | if (!kdb_check_flags(kt->flags, kdb_cmd_enabled, true)) |
420c2b1b | 2426 | continue; |
e868f0a3 | 2427 | if (strlen(kt->usage) > 20) |
074604af | 2428 | space = "\n "; |
e868f0a3 SG |
2429 | kdb_printf("%-15.15s %-20s%s%s\n", kt->name, |
2430 | kt->usage, space, kt->help); | |
5d5314d6 JW |
2431 | } |
2432 | return 0; | |
2433 | } | |
2434 | ||
2435 | /* | |
2436 | * kdb_kill - This function implements the 'kill' commands. | |
2437 | */ | |
2438 | static int kdb_kill(int argc, const char **argv) | |
2439 | { | |
2440 | long sig, pid; | |
2441 | char *endp; | |
2442 | struct task_struct *p; | |
5d5314d6 JW |
2443 | |
2444 | if (argc != 2) | |
2445 | return KDB_ARGCOUNT; | |
2446 | ||
2447 | sig = simple_strtol(argv[1], &endp, 0); | |
2448 | if (*endp) | |
2449 | return KDB_BADINT; | |
0b44bf9a | 2450 | if ((sig >= 0) || !valid_signal(-sig)) { |
5d5314d6 JW |
2451 | kdb_printf("Invalid signal parameter.<-signal>\n"); |
2452 | return 0; | |
2453 | } | |
2454 | sig = -sig; | |
2455 | ||
2456 | pid = simple_strtol(argv[2], &endp, 0); | |
2457 | if (*endp) | |
2458 | return KDB_BADINT; | |
2459 | if (pid <= 0) { | |
2460 | kdb_printf("Process ID must be large than 0.\n"); | |
2461 | return 0; | |
2462 | } | |
2463 | ||
2464 | /* Find the process. */ | |
2465 | p = find_task_by_pid_ns(pid, &init_pid_ns); | |
2466 | if (!p) { | |
2467 | kdb_printf("The specified process isn't found.\n"); | |
2468 | return 0; | |
2469 | } | |
2470 | p = p->group_leader; | |
0b44bf9a | 2471 | kdb_send_sig(p, sig); |
5d5314d6 JW |
2472 | return 0; |
2473 | } | |
2474 | ||
5d5314d6 JW |
2475 | /* |
2476 | * Most of this code has been lifted from kernel/timer.c::sys_sysinfo(). | |
2477 | * I cannot call that code directly from kdb, it has an unconditional | |
2478 | * cli()/sti() and calls routines that take locks which can stop the debugger. | |
2479 | */ | |
2480 | static void kdb_sysinfo(struct sysinfo *val) | |
2481 | { | |
40b90efe BW |
2482 | u64 uptime = ktime_get_mono_fast_ns(); |
2483 | ||
5d5314d6 | 2484 | memset(val, 0, sizeof(*val)); |
40b90efe | 2485 | val->uptime = div_u64(uptime, NSEC_PER_SEC); |
5d5314d6 JW |
2486 | val->loads[0] = avenrun[0]; |
2487 | val->loads[1] = avenrun[1]; | |
2488 | val->loads[2] = avenrun[2]; | |
2489 | val->procs = nr_threads-1; | |
2490 | si_meminfo(val); | |
2491 | ||
2492 | return; | |
2493 | } | |
2494 | ||
2495 | /* | |
2496 | * kdb_summary - This function implements the 'summary' command. | |
2497 | */ | |
2498 | static int kdb_summary(int argc, const char **argv) | |
2499 | { | |
6909e29f | 2500 | time64_t now; |
5d5314d6 JW |
2501 | struct sysinfo val; |
2502 | ||
2503 | if (argc) | |
2504 | return KDB_ARGCOUNT; | |
2505 | ||
2506 | kdb_printf("sysname %s\n", init_uts_ns.name.sysname); | |
2507 | kdb_printf("release %s\n", init_uts_ns.name.release); | |
2508 | kdb_printf("version %s\n", init_uts_ns.name.version); | |
2509 | kdb_printf("machine %s\n", init_uts_ns.name.machine); | |
2510 | kdb_printf("nodename %s\n", init_uts_ns.name.nodename); | |
2511 | kdb_printf("domainname %s\n", init_uts_ns.name.domainname); | |
5d5314d6 | 2512 | |
6909e29f | 2513 | now = __ktime_get_real_seconds(); |
126ac4d6 | 2514 | kdb_printf("date %ptTs tz_minuteswest %d\n", &now, sys_tz.tz_minuteswest); |
5d5314d6 JW |
2515 | kdb_sysinfo(&val); |
2516 | kdb_printf("uptime "); | |
2517 | if (val.uptime > (24*60*60)) { | |
2518 | int days = val.uptime / (24*60*60); | |
2519 | val.uptime %= (24*60*60); | |
2520 | kdb_printf("%d day%s ", days, days == 1 ? "" : "s"); | |
2521 | } | |
2522 | kdb_printf("%02ld:%02ld\n", val.uptime/(60*60), (val.uptime/60)%60); | |
2523 | ||
5d5314d6 JW |
2524 | kdb_printf("load avg %ld.%02ld %ld.%02ld %ld.%02ld\n", |
2525 | LOAD_INT(val.loads[0]), LOAD_FRAC(val.loads[0]), | |
2526 | LOAD_INT(val.loads[1]), LOAD_FRAC(val.loads[1]), | |
2527 | LOAD_INT(val.loads[2]), LOAD_FRAC(val.loads[2])); | |
8508cf3f | 2528 | |
5d5314d6 JW |
2529 | /* Display in kilobytes */ |
2530 | #define K(x) ((x) << (PAGE_SHIFT - 10)) | |
2531 | kdb_printf("\nMemTotal: %8lu kB\nMemFree: %8lu kB\n" | |
2532 | "Buffers: %8lu kB\n", | |
14675592 | 2533 | K(val.totalram), K(val.freeram), K(val.bufferram)); |
5d5314d6 JW |
2534 | return 0; |
2535 | } | |
2536 | ||
2537 | /* | |
2538 | * kdb_per_cpu - This function implements the 'per_cpu' command. | |
2539 | */ | |
2540 | static int kdb_per_cpu(int argc, const char **argv) | |
2541 | { | |
931ea248 JW |
2542 | char fmtstr[64]; |
2543 | int cpu, diag, nextarg = 1; | |
2544 | unsigned long addr, symaddr, val, bytesperword = 0, whichcpu = ~0UL; | |
5d5314d6 JW |
2545 | |
2546 | if (argc < 1 || argc > 3) | |
2547 | return KDB_ARGCOUNT; | |
2548 | ||
931ea248 JW |
2549 | diag = kdbgetaddrarg(argc, argv, &nextarg, &symaddr, NULL, NULL); |
2550 | if (diag) | |
2551 | return diag; | |
2552 | ||
5d5314d6 JW |
2553 | if (argc >= 2) { |
2554 | diag = kdbgetularg(argv[2], &bytesperword); | |
2555 | if (diag) | |
2556 | return diag; | |
2557 | } | |
2558 | if (!bytesperword) | |
2559 | bytesperword = KDB_WORD_SIZE; | |
2560 | else if (bytesperword > KDB_WORD_SIZE) | |
2561 | return KDB_BADWIDTH; | |
2562 | sprintf(fmtstr, "%%0%dlx ", (int)(2*bytesperword)); | |
2563 | if (argc >= 3) { | |
2564 | diag = kdbgetularg(argv[3], &whichcpu); | |
2565 | if (diag) | |
2566 | return diag; | |
b586627e | 2567 | if (whichcpu >= nr_cpu_ids || !cpu_online(whichcpu)) { |
5d5314d6 JW |
2568 | kdb_printf("cpu %ld is not online\n", whichcpu); |
2569 | return KDB_BADCPUNUM; | |
2570 | } | |
2571 | } | |
2572 | ||
2573 | /* Most architectures use __per_cpu_offset[cpu], some use | |
2574 | * __per_cpu_offset(cpu), smp has no __per_cpu_offset. | |
2575 | */ | |
2576 | #ifdef __per_cpu_offset | |
2577 | #define KDB_PCU(cpu) __per_cpu_offset(cpu) | |
2578 | #else | |
2579 | #ifdef CONFIG_SMP | |
2580 | #define KDB_PCU(cpu) __per_cpu_offset[cpu] | |
2581 | #else | |
2582 | #define KDB_PCU(cpu) 0 | |
2583 | #endif | |
2584 | #endif | |
5d5314d6 | 2585 | for_each_online_cpu(cpu) { |
931ea248 JW |
2586 | if (KDB_FLAG(CMD_INTERRUPT)) |
2587 | return 0; | |
2588 | ||
5d5314d6 JW |
2589 | if (whichcpu != ~0UL && whichcpu != cpu) |
2590 | continue; | |
931ea248 | 2591 | addr = symaddr + KDB_PCU(cpu); |
5d5314d6 JW |
2592 | diag = kdb_getword(&val, addr, bytesperword); |
2593 | if (diag) { | |
2594 | kdb_printf("%5d " kdb_bfd_vma_fmt0 " - unable to " | |
2595 | "read, diag=%d\n", cpu, addr, diag); | |
2596 | continue; | |
2597 | } | |
5d5314d6 JW |
2598 | kdb_printf("%5d ", cpu); |
2599 | kdb_md_line(fmtstr, addr, | |
2600 | bytesperword == KDB_WORD_SIZE, | |
2601 | 1, bytesperword, 1, 1, 0); | |
2602 | } | |
5d5314d6 | 2603 | #undef KDB_PCU |
5d5314d6 JW |
2604 | return 0; |
2605 | } | |
2606 | ||
2607 | /* | |
2608 | * display help for the use of cmd | grep pattern | |
2609 | */ | |
2610 | static int kdb_grep_help(int argc, const char **argv) | |
2611 | { | |
2612 | kdb_printf("Usage of cmd args | grep pattern:\n"); | |
2613 | kdb_printf(" Any command's output may be filtered through an "); | |
2614 | kdb_printf("emulated 'pipe'.\n"); | |
2615 | kdb_printf(" 'grep' is just a key word.\n"); | |
2616 | kdb_printf(" The pattern may include a very limited set of " | |
2617 | "metacharacters:\n"); | |
2618 | kdb_printf(" pattern or ^pattern or pattern$ or ^pattern$\n"); | |
2619 | kdb_printf(" And if there are spaces in the pattern, you may " | |
2620 | "quote it:\n"); | |
2621 | kdb_printf(" \"pat tern\" or \"^pat tern\" or \"pat tern$\"" | |
2622 | " or \"^pat tern$\"\n"); | |
2623 | return 0; | |
2624 | } | |
2625 | ||
c25abcd6 SG |
2626 | /** |
2627 | * kdb_register() - This function is used to register a kernel debugger | |
2628 | * command. | |
2629 | * @cmd: pointer to kdb command | |
2630 | * | |
2631 | * Note that it's the job of the caller to keep the memory for the cmd | |
2632 | * allocated until unregister is called. | |
5d5314d6 | 2633 | */ |
c25abcd6 | 2634 | int kdb_register(kdbtab_t *cmd) |
5d5314d6 | 2635 | { |
5d5314d6 JW |
2636 | kdbtab_t *kp; |
2637 | ||
e4f291b3 | 2638 | list_for_each_entry(kp, &kdb_cmds_head, list_node) { |
e868f0a3 | 2639 | if (strcmp(kp->name, cmd->name) == 0) { |
c25abcd6 | 2640 | kdb_printf("Duplicate kdb cmd: %s, func %p help %s\n", |
e868f0a3 | 2641 | cmd->name, cmd->func, cmd->help); |
5d5314d6 JW |
2642 | return 1; |
2643 | } | |
2644 | } | |
2645 | ||
c25abcd6 | 2646 | list_add_tail(&cmd->list_node, &kdb_cmds_head); |
5d5314d6 JW |
2647 | return 0; |
2648 | } | |
c25abcd6 | 2649 | EXPORT_SYMBOL_GPL(kdb_register); |
f7030bbc | 2650 | |
c25abcd6 | 2651 | /** |
e4f291b3 SG |
2652 | * kdb_register_table() - This function is used to register a kdb command |
2653 | * table. | |
2654 | * @kp: pointer to kdb command table | |
2655 | * @len: length of kdb command table | |
2656 | */ | |
2657 | void kdb_register_table(kdbtab_t *kp, size_t len) | |
2658 | { | |
2659 | while (len--) { | |
2660 | list_add_tail(&kp->list_node, &kdb_cmds_head); | |
2661 | kp++; | |
2662 | } | |
2663 | } | |
5d5314d6 | 2664 | |
c25abcd6 SG |
2665 | /** |
2666 | * kdb_unregister() - This function is used to unregister a kernel debugger | |
2667 | * command. It is generally called when a module which | |
2668 | * implements kdb command is unloaded. | |
2669 | * @cmd: pointer to kdb command | |
5d5314d6 | 2670 | */ |
c25abcd6 | 2671 | void kdb_unregister(kdbtab_t *cmd) |
5d5314d6 | 2672 | { |
c25abcd6 | 2673 | list_del(&cmd->list_node); |
5d5314d6 | 2674 | } |
f7030bbc | 2675 | EXPORT_SYMBOL_GPL(kdb_unregister); |
5d5314d6 | 2676 | |
e4f291b3 | 2677 | static kdbtab_t maintab[] = { |
e868f0a3 SG |
2678 | { .name = "md", |
2679 | .func = kdb_md, | |
2680 | .usage = "<vaddr>", | |
2681 | .help = "Display Memory Contents, also mdWcN, e.g. md8c1", | |
2682 | .minlen = 1, | |
2683 | .flags = KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS, | |
e4f291b3 | 2684 | }, |
e868f0a3 SG |
2685 | { .name = "mdr", |
2686 | .func = kdb_md, | |
2687 | .usage = "<vaddr> <bytes>", | |
2688 | .help = "Display Raw Memory", | |
2689 | .flags = KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS, | |
e4f291b3 | 2690 | }, |
e868f0a3 SG |
2691 | { .name = "mdp", |
2692 | .func = kdb_md, | |
2693 | .usage = "<paddr> <bytes>", | |
2694 | .help = "Display Physical Memory", | |
2695 | .flags = KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS, | |
e4f291b3 | 2696 | }, |
e868f0a3 SG |
2697 | { .name = "mds", |
2698 | .func = kdb_md, | |
2699 | .usage = "<vaddr>", | |
2700 | .help = "Display Memory Symbolically", | |
2701 | .flags = KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS, | |
e4f291b3 | 2702 | }, |
e868f0a3 SG |
2703 | { .name = "mm", |
2704 | .func = kdb_mm, | |
2705 | .usage = "<vaddr> <contents>", | |
2706 | .help = "Modify Memory Contents", | |
2707 | .flags = KDB_ENABLE_MEM_WRITE | KDB_REPEAT_NO_ARGS, | |
e4f291b3 | 2708 | }, |
e868f0a3 SG |
2709 | { .name = "go", |
2710 | .func = kdb_go, | |
2711 | .usage = "[<vaddr>]", | |
2712 | .help = "Continue Execution", | |
2713 | .minlen = 1, | |
2714 | .flags = KDB_ENABLE_REG_WRITE | | |
e4f291b3 SG |
2715 | KDB_ENABLE_ALWAYS_SAFE_NO_ARGS, |
2716 | }, | |
e868f0a3 SG |
2717 | { .name = "rd", |
2718 | .func = kdb_rd, | |
2719 | .usage = "", | |
2720 | .help = "Display Registers", | |
2721 | .flags = KDB_ENABLE_REG_READ, | |
e4f291b3 | 2722 | }, |
e868f0a3 SG |
2723 | { .name = "rm", |
2724 | .func = kdb_rm, | |
2725 | .usage = "<reg> <contents>", | |
2726 | .help = "Modify Registers", | |
2727 | .flags = KDB_ENABLE_REG_WRITE, | |
e4f291b3 | 2728 | }, |
e868f0a3 SG |
2729 | { .name = "ef", |
2730 | .func = kdb_ef, | |
2731 | .usage = "<vaddr>", | |
2732 | .help = "Display exception frame", | |
2733 | .flags = KDB_ENABLE_MEM_READ, | |
e4f291b3 | 2734 | }, |
e868f0a3 SG |
2735 | { .name = "bt", |
2736 | .func = kdb_bt, | |
2737 | .usage = "[<vaddr>]", | |
2738 | .help = "Stack traceback", | |
2739 | .minlen = 1, | |
2740 | .flags = KDB_ENABLE_MEM_READ | KDB_ENABLE_INSPECT_NO_ARGS, | |
e4f291b3 | 2741 | }, |
e868f0a3 SG |
2742 | { .name = "btp", |
2743 | .func = kdb_bt, | |
2744 | .usage = "<pid>", | |
2745 | .help = "Display stack for process <pid>", | |
2746 | .flags = KDB_ENABLE_INSPECT, | |
e4f291b3 | 2747 | }, |
e868f0a3 SG |
2748 | { .name = "bta", |
2749 | .func = kdb_bt, | |
b77dbc86 DT |
2750 | .usage = "[<state_chars>|A]", |
2751 | .help = "Backtrace all processes whose state matches", | |
e868f0a3 | 2752 | .flags = KDB_ENABLE_INSPECT, |
e4f291b3 | 2753 | }, |
e868f0a3 SG |
2754 | { .name = "btc", |
2755 | .func = kdb_bt, | |
2756 | .usage = "", | |
2757 | .help = "Backtrace current process on each cpu", | |
2758 | .flags = KDB_ENABLE_INSPECT, | |
e4f291b3 | 2759 | }, |
e868f0a3 SG |
2760 | { .name = "btt", |
2761 | .func = kdb_bt, | |
2762 | .usage = "<vaddr>", | |
2763 | .help = "Backtrace process given its struct task address", | |
2764 | .flags = KDB_ENABLE_MEM_READ | KDB_ENABLE_INSPECT_NO_ARGS, | |
e4f291b3 | 2765 | }, |
e868f0a3 SG |
2766 | { .name = "env", |
2767 | .func = kdb_env, | |
2768 | .usage = "", | |
2769 | .help = "Show environment variables", | |
2770 | .flags = KDB_ENABLE_ALWAYS_SAFE, | |
e4f291b3 | 2771 | }, |
e868f0a3 SG |
2772 | { .name = "set", |
2773 | .func = kdb_set, | |
2774 | .usage = "", | |
2775 | .help = "Set environment variables", | |
2776 | .flags = KDB_ENABLE_ALWAYS_SAFE, | |
e4f291b3 | 2777 | }, |
e868f0a3 SG |
2778 | { .name = "help", |
2779 | .func = kdb_help, | |
2780 | .usage = "", | |
2781 | .help = "Display Help Message", | |
2782 | .minlen = 1, | |
2783 | .flags = KDB_ENABLE_ALWAYS_SAFE, | |
e4f291b3 | 2784 | }, |
e868f0a3 SG |
2785 | { .name = "?", |
2786 | .func = kdb_help, | |
2787 | .usage = "", | |
2788 | .help = "Display Help Message", | |
2789 | .flags = KDB_ENABLE_ALWAYS_SAFE, | |
e4f291b3 | 2790 | }, |
e868f0a3 SG |
2791 | { .name = "cpu", |
2792 | .func = kdb_cpu, | |
2793 | .usage = "<cpunum>", | |
2794 | .help = "Switch to new cpu", | |
2795 | .flags = KDB_ENABLE_ALWAYS_SAFE_NO_ARGS, | |
e4f291b3 | 2796 | }, |
e868f0a3 SG |
2797 | { .name = "kgdb", |
2798 | .func = kdb_kgdb, | |
2799 | .usage = "", | |
2800 | .help = "Enter kgdb mode", | |
2801 | .flags = 0, | |
e4f291b3 | 2802 | }, |
e868f0a3 SG |
2803 | { .name = "ps", |
2804 | .func = kdb_ps, | |
b77dbc86 | 2805 | .usage = "[<state_chars>|A]", |
e868f0a3 SG |
2806 | .help = "Display active task list", |
2807 | .flags = KDB_ENABLE_INSPECT, | |
e4f291b3 | 2808 | }, |
e868f0a3 SG |
2809 | { .name = "pid", |
2810 | .func = kdb_pid, | |
2811 | .usage = "<pidnum>", | |
2812 | .help = "Switch to another task", | |
2813 | .flags = KDB_ENABLE_INSPECT, | |
e4f291b3 | 2814 | }, |
e868f0a3 SG |
2815 | { .name = "reboot", |
2816 | .func = kdb_reboot, | |
2817 | .usage = "", | |
2818 | .help = "Reboot the machine immediately", | |
2819 | .flags = KDB_ENABLE_REBOOT, | |
e4f291b3 | 2820 | }, |
5d5314d6 | 2821 | #if defined(CONFIG_MODULES) |
e868f0a3 SG |
2822 | { .name = "lsmod", |
2823 | .func = kdb_lsmod, | |
2824 | .usage = "", | |
2825 | .help = "List loaded kernel modules", | |
2826 | .flags = KDB_ENABLE_INSPECT, | |
e4f291b3 | 2827 | }, |
5d5314d6 JW |
2828 | #endif |
2829 | #if defined(CONFIG_MAGIC_SYSRQ) | |
e868f0a3 SG |
2830 | { .name = "sr", |
2831 | .func = kdb_sr, | |
2832 | .usage = "<key>", | |
2833 | .help = "Magic SysRq key", | |
2834 | .flags = KDB_ENABLE_ALWAYS_SAFE, | |
e4f291b3 | 2835 | }, |
5d5314d6 JW |
2836 | #endif |
2837 | #if defined(CONFIG_PRINTK) | |
e868f0a3 SG |
2838 | { .name = "dmesg", |
2839 | .func = kdb_dmesg, | |
2840 | .usage = "[lines]", | |
2841 | .help = "Display syslog buffer", | |
2842 | .flags = KDB_ENABLE_ALWAYS_SAFE, | |
e4f291b3 | 2843 | }, |
5d5314d6 | 2844 | #endif |
e868f0a3 SG |
2845 | { .name = "defcmd", |
2846 | .func = kdb_defcmd, | |
2847 | .usage = "name \"usage\" \"help\"", | |
2848 | .help = "Define a set of commands, down to endefcmd", | |
c25abcd6 SG |
2849 | /* |
2850 | * Macros are always safe because when executed each | |
2851 | * internal command re-enters kdb_parse() and is safety | |
2852 | * checked individually. | |
2853 | */ | |
e868f0a3 | 2854 | .flags = KDB_ENABLE_ALWAYS_SAFE, |
e4f291b3 | 2855 | }, |
e868f0a3 SG |
2856 | { .name = "kill", |
2857 | .func = kdb_kill, | |
2858 | .usage = "<-signal> <pid>", | |
2859 | .help = "Send a signal to a process", | |
2860 | .flags = KDB_ENABLE_SIGNAL, | |
e4f291b3 | 2861 | }, |
e868f0a3 SG |
2862 | { .name = "summary", |
2863 | .func = kdb_summary, | |
2864 | .usage = "", | |
2865 | .help = "Summarize the system", | |
2866 | .minlen = 4, | |
2867 | .flags = KDB_ENABLE_ALWAYS_SAFE, | |
e4f291b3 | 2868 | }, |
e868f0a3 SG |
2869 | { .name = "per_cpu", |
2870 | .func = kdb_per_cpu, | |
2871 | .usage = "<sym> [<bytes>] [<cpu>]", | |
2872 | .help = "Display per_cpu variables", | |
2873 | .minlen = 3, | |
2874 | .flags = KDB_ENABLE_MEM_READ, | |
e4f291b3 | 2875 | }, |
e868f0a3 SG |
2876 | { .name = "grephelp", |
2877 | .func = kdb_grep_help, | |
2878 | .usage = "", | |
2879 | .help = "Display help on | grep", | |
2880 | .flags = KDB_ENABLE_ALWAYS_SAFE, | |
e4f291b3 SG |
2881 | }, |
2882 | }; | |
2883 | ||
2884 | static kdbtab_t nmicmd = { | |
e868f0a3 SG |
2885 | .name = "disable_nmi", |
2886 | .func = kdb_disable_nmi, | |
2887 | .usage = "", | |
2888 | .help = "Disable NMI entry to KDB", | |
2889 | .flags = KDB_ENABLE_ALWAYS_SAFE, | |
e4f291b3 SG |
2890 | }; |
2891 | ||
2892 | /* Initialize the kdb command table. */ | |
2893 | static void __init kdb_inittab(void) | |
2894 | { | |
2895 | kdb_register_table(maintab, ARRAY_SIZE(maintab)); | |
2896 | if (arch_kgdb_ops.enable_nmi) | |
2897 | kdb_register_table(&nmicmd, 1); | |
5d5314d6 JW |
2898 | } |
2899 | ||
2900 | /* Execute any commands defined in kdb_cmds. */ | |
2901 | static void __init kdb_cmd_init(void) | |
2902 | { | |
2903 | int i, diag; | |
2904 | for (i = 0; kdb_cmds[i]; ++i) { | |
2905 | diag = kdb_parse(kdb_cmds[i]); | |
2906 | if (diag) | |
2907 | kdb_printf("kdb command %s failed, kdb diag %d\n", | |
2908 | kdb_cmds[i], diag); | |
2909 | } | |
2910 | if (defcmd_in_progress) { | |
2911 | kdb_printf("Incomplete 'defcmd' set, forcing endefcmd\n"); | |
2912 | kdb_parse("endefcmd"); | |
2913 | } | |
2914 | } | |
2915 | ||
b595076a | 2916 | /* Initialize kdb_printf, breakpoint tables and kdb state */ |
5d5314d6 JW |
2917 | void __init kdb_init(int lvl) |
2918 | { | |
2919 | static int kdb_init_lvl = KDB_NOT_INITIALIZED; | |
2920 | int i; | |
2921 | ||
2922 | if (kdb_init_lvl == KDB_INIT_FULL || lvl <= kdb_init_lvl) | |
2923 | return; | |
2924 | for (i = kdb_init_lvl; i < lvl; i++) { | |
2925 | switch (i) { | |
2926 | case KDB_NOT_INITIALIZED: | |
2927 | kdb_inittab(); /* Initialize Command Table */ | |
2928 | kdb_initbptab(); /* Initialize Breakpoints */ | |
2929 | break; | |
2930 | case KDB_INIT_EARLY: | |
2931 | kdb_cmd_init(); /* Build kdb_cmds tables */ | |
2932 | break; | |
2933 | } | |
2934 | } | |
2935 | kdb_init_lvl = lvl; | |
2936 | } |