Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 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> |
Anton Vorontsov | 420c2b1 | 2014-11-06 14:36:46 +0000 | [diff] [blame] | 15 | #include <linux/types.h> |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 16 | #include <linux/string.h> |
| 17 | #include <linux/kernel.h> |
Anton Vorontsov | bc792e6 | 2012-07-20 17:27:37 -0700 | [diff] [blame] | 18 | #include <linux/kmsg_dump.h> |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 19 | #include <linux/reboot.h> |
| 20 | #include <linux/sched.h> |
Ingo Molnar | badaff8 | 2017-02-08 08:45:17 +0100 | [diff] [blame] | 21 | #include <linux/sched/loadavg.h> |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 22 | #include <linux/sysrq.h> |
| 23 | #include <linux/smp.h> |
| 24 | #include <linux/utsname.h> |
| 25 | #include <linux/vmalloc.h> |
Anton Vorontsov | ad394f6 | 2012-09-24 14:27:51 -0700 | [diff] [blame] | 26 | #include <linux/atomic.h> |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 27 | #include <linux/module.h> |
Anton Vorontsov | 420c2b1 | 2014-11-06 14:36:46 +0000 | [diff] [blame] | 28 | #include <linux/moduleparam.h> |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 29 | #include <linux/mm.h> |
| 30 | #include <linux/init.h> |
| 31 | #include <linux/kallsyms.h> |
| 32 | #include <linux/kgdb.h> |
| 33 | #include <linux/kdb.h> |
| 34 | #include <linux/notifier.h> |
| 35 | #include <linux/interrupt.h> |
| 36 | #include <linux/delay.h> |
| 37 | #include <linux/nmi.h> |
| 38 | #include <linux/time.h> |
| 39 | #include <linux/ptrace.h> |
| 40 | #include <linux/sysctl.h> |
| 41 | #include <linux/cpu.h> |
| 42 | #include <linux/kdebug.h> |
| 43 | #include <linux/proc_fs.h> |
| 44 | #include <linux/uaccess.h> |
| 45 | #include <linux/slab.h> |
| 46 | #include "kdb_private.h" |
| 47 | |
Anton Vorontsov | 420c2b1 | 2014-11-06 14:36:46 +0000 | [diff] [blame] | 48 | #undef MODULE_PARAM_PREFIX |
| 49 | #define MODULE_PARAM_PREFIX "kdb." |
| 50 | |
Daniel Thompson | b801717 | 2014-11-06 14:36:47 +0000 | [diff] [blame] | 51 | static int kdb_cmd_enabled = CONFIG_KDB_DEFAULT_ENABLE; |
Anton Vorontsov | 420c2b1 | 2014-11-06 14:36:46 +0000 | [diff] [blame] | 52 | module_param_named(cmd_enable, kdb_cmd_enabled, int, 0600); |
| 53 | |
Daniel Thompson | fb6daa7 | 2014-09-11 10:37:10 +0100 | [diff] [blame] | 54 | char kdb_grep_string[KDB_GREP_STRLEN]; |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 55 | int kdb_grepping_flag; |
| 56 | EXPORT_SYMBOL(kdb_grepping_flag); |
| 57 | int kdb_grep_leading; |
| 58 | int kdb_grep_trailing; |
| 59 | |
| 60 | /* |
| 61 | * Kernel debugger state flags |
| 62 | */ |
| 63 | int kdb_flags; |
| 64 | atomic_t kdb_event; |
| 65 | |
| 66 | /* |
| 67 | * kdb_lock protects updates to kdb_initial_cpu. Used to |
| 68 | * single thread processors through the kernel debugger. |
| 69 | */ |
| 70 | int kdb_initial_cpu = -1; /* cpu number that owns kdb */ |
| 71 | int kdb_nextline = 1; |
| 72 | int kdb_state; /* General KDB state */ |
| 73 | |
| 74 | struct task_struct *kdb_current_task; |
| 75 | EXPORT_SYMBOL(kdb_current_task); |
| 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 | |
| 87 | /* kdb_commands describes the available commands. */ |
| 88 | static kdbtab_t *kdb_commands; |
| 89 | #define KDB_BASE_CMD_MAX 50 |
| 90 | static int kdb_max_commands = KDB_BASE_CMD_MAX; |
Jovi Zhang | 27029c3 | 2010-03-15 07:28:00 -0500 | [diff] [blame] | 91 | static kdbtab_t kdb_base_commands[KDB_BASE_CMD_MAX]; |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 92 | #define for_each_kdbcmd(cmd, num) \ |
| 93 | for ((cmd) = kdb_base_commands, (num) = 0; \ |
| 94 | num < kdb_max_commands; \ |
Jovi Zhang | 5450d90 | 2010-11-10 07:22:18 -0600 | [diff] [blame] | 95 | num++, num == KDB_BASE_CMD_MAX ? cmd = kdb_commands : cmd++) |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 96 | |
| 97 | typedef struct _kdbmsg { |
| 98 | int km_diag; /* kdb diagnostic */ |
| 99 | char *km_msg; /* Corresponding message text */ |
| 100 | } kdbmsg_t; |
| 101 | |
| 102 | #define KDBMSG(msgnum, text) \ |
| 103 | { KDB_##msgnum, text } |
| 104 | |
| 105 | static kdbmsg_t kdbmsgs[] = { |
| 106 | KDBMSG(NOTFOUND, "Command Not Found"), |
| 107 | KDBMSG(ARGCOUNT, "Improper argument count, see usage."), |
| 108 | KDBMSG(BADWIDTH, "Illegal value for BYTESPERWORD use 1, 2, 4 or 8, " |
| 109 | "8 is only allowed on 64 bit systems"), |
| 110 | KDBMSG(BADRADIX, "Illegal value for RADIX use 8, 10 or 16"), |
| 111 | KDBMSG(NOTENV, "Cannot find environment variable"), |
| 112 | KDBMSG(NOENVVALUE, "Environment variable should have value"), |
| 113 | KDBMSG(NOTIMP, "Command not implemented"), |
| 114 | KDBMSG(ENVFULL, "Environment full"), |
| 115 | KDBMSG(ENVBUFFULL, "Environment buffer full"), |
| 116 | KDBMSG(TOOMANYBPT, "Too many breakpoints defined"), |
| 117 | #ifdef CONFIG_CPU_XSCALE |
| 118 | KDBMSG(TOOMANYDBREGS, "More breakpoints than ibcr registers defined"), |
| 119 | #else |
| 120 | KDBMSG(TOOMANYDBREGS, "More breakpoints than db registers defined"), |
| 121 | #endif |
| 122 | KDBMSG(DUPBPT, "Duplicate breakpoint address"), |
| 123 | KDBMSG(BPTNOTFOUND, "Breakpoint not found"), |
| 124 | KDBMSG(BADMODE, "Invalid IDMODE"), |
| 125 | KDBMSG(BADINT, "Illegal numeric value"), |
| 126 | KDBMSG(INVADDRFMT, "Invalid symbolic address format"), |
| 127 | KDBMSG(BADREG, "Invalid register name"), |
| 128 | KDBMSG(BADCPUNUM, "Invalid cpu number"), |
| 129 | KDBMSG(BADLENGTH, "Invalid length field"), |
| 130 | KDBMSG(NOBP, "No Breakpoint exists"), |
| 131 | KDBMSG(BADADDR, "Invalid address"), |
Anton Vorontsov | 420c2b1 | 2014-11-06 14:36:46 +0000 | [diff] [blame] | 132 | KDBMSG(NOPERM, "Permission denied"), |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 133 | }; |
| 134 | #undef KDBMSG |
| 135 | |
Sasha Levin | 5f784f7 | 2012-12-20 14:11:27 -0500 | [diff] [blame] | 136 | static const int __nkdb_err = ARRAY_SIZE(kdbmsgs); |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 137 | |
| 138 | |
| 139 | /* |
| 140 | * Initial environment. This is all kept static and local to |
| 141 | * this file. We don't want to rely on the memory allocation |
| 142 | * mechanisms in the kernel, so we use a very limited allocate-only |
| 143 | * heap for new and altered environment variables. The entire |
| 144 | * environment is limited to a fixed number of entries (add more |
| 145 | * to __env[] if required) and a fixed amount of heap (add more to |
| 146 | * KDB_ENVBUFSIZE if required). |
| 147 | */ |
| 148 | |
| 149 | static char *__env[] = { |
| 150 | #if defined(CONFIG_SMP) |
| 151 | "PROMPT=[%d]kdb> ", |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 152 | #else |
| 153 | "PROMPT=kdb> ", |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 154 | #endif |
Jason Wessel | 0f26d0e | 2012-07-30 22:44:41 -0500 | [diff] [blame] | 155 | "MOREPROMPT=more> ", |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 156 | "RADIX=16", |
| 157 | "MDCOUNT=8", /* lines of md output */ |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 158 | KDB_PLATFORM_ENV, |
| 159 | "DTABCOUNT=30", |
| 160 | "NOSECT=1", |
| 161 | (char *)0, |
| 162 | (char *)0, |
| 163 | (char *)0, |
| 164 | (char *)0, |
| 165 | (char *)0, |
| 166 | (char *)0, |
| 167 | (char *)0, |
| 168 | (char *)0, |
| 169 | (char *)0, |
| 170 | (char *)0, |
| 171 | (char *)0, |
| 172 | (char *)0, |
| 173 | (char *)0, |
| 174 | (char *)0, |
| 175 | (char *)0, |
| 176 | (char *)0, |
| 177 | (char *)0, |
| 178 | (char *)0, |
| 179 | (char *)0, |
| 180 | (char *)0, |
| 181 | (char *)0, |
| 182 | (char *)0, |
| 183 | (char *)0, |
Jason Wessel | 3bdb65e | 2011-06-30 14:12:00 -0500 | [diff] [blame] | 184 | (char *)0, |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 185 | }; |
| 186 | |
Sasha Levin | 5f784f7 | 2012-12-20 14:11:27 -0500 | [diff] [blame] | 187 | static const int __nenv = ARRAY_SIZE(__env); |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 188 | |
| 189 | struct task_struct *kdb_curr_task(int cpu) |
| 190 | { |
| 191 | struct task_struct *p = curr_task(cpu); |
| 192 | #ifdef _TIF_MCA_INIT |
| 193 | if ((task_thread_info(p)->flags & _TIF_MCA_INIT) && KDB_TSK(cpu)) |
| 194 | p = krp->p; |
| 195 | #endif |
| 196 | return p; |
| 197 | } |
| 198 | |
| 199 | /* |
Daniel Thompson | 9452e97 | 2014-11-06 14:36:45 +0000 | [diff] [blame] | 200 | * Check whether the flags of the current command and the permissions |
| 201 | * of the kdb console has allow a command to be run. |
| 202 | */ |
| 203 | static inline bool kdb_check_flags(kdb_cmdflags_t flags, int permissions, |
| 204 | bool no_args) |
| 205 | { |
| 206 | /* permissions comes from userspace so needs massaging slightly */ |
| 207 | permissions &= KDB_ENABLE_MASK; |
| 208 | permissions |= KDB_ENABLE_ALWAYS_SAFE; |
| 209 | |
| 210 | /* some commands change group when launched with no arguments */ |
| 211 | if (no_args) |
| 212 | permissions |= permissions << KDB_ENABLE_NO_ARGS_SHIFT; |
| 213 | |
| 214 | flags |= KDB_ENABLE_ALL; |
| 215 | |
| 216 | return permissions & flags; |
| 217 | } |
| 218 | |
| 219 | /* |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 220 | * kdbgetenv - This function will return the character string value of |
| 221 | * an environment variable. |
| 222 | * Parameters: |
| 223 | * match A character string representing an environment variable. |
| 224 | * Returns: |
| 225 | * NULL No environment variable matches 'match' |
| 226 | * char* Pointer to string value of environment variable. |
| 227 | */ |
| 228 | char *kdbgetenv(const char *match) |
| 229 | { |
| 230 | char **ep = __env; |
| 231 | int matchlen = strlen(match); |
| 232 | int i; |
| 233 | |
| 234 | for (i = 0; i < __nenv; i++) { |
| 235 | char *e = *ep++; |
| 236 | |
| 237 | if (!e) |
| 238 | continue; |
| 239 | |
| 240 | if ((strncmp(match, e, matchlen) == 0) |
| 241 | && ((e[matchlen] == '\0') |
| 242 | || (e[matchlen] == '='))) { |
| 243 | char *cp = strchr(e, '='); |
| 244 | return cp ? ++cp : ""; |
| 245 | } |
| 246 | } |
| 247 | return NULL; |
| 248 | } |
| 249 | |
| 250 | /* |
| 251 | * kdballocenv - This function is used to allocate bytes for |
| 252 | * environment entries. |
| 253 | * Parameters: |
| 254 | * match A character string representing a numeric value |
| 255 | * Outputs: |
| 256 | * *value the unsigned long representation of the env variable 'match' |
| 257 | * Returns: |
| 258 | * Zero on success, a kdb diagnostic on failure. |
| 259 | * Remarks: |
| 260 | * We use a static environment buffer (envbuffer) to hold the values |
| 261 | * of dynamically generated environment variables (see kdb_set). Buffer |
| 262 | * space once allocated is never free'd, so over time, the amount of space |
| 263 | * (currently 512 bytes) will be exhausted if env variables are changed |
| 264 | * frequently. |
| 265 | */ |
| 266 | static char *kdballocenv(size_t bytes) |
| 267 | { |
| 268 | #define KDB_ENVBUFSIZE 512 |
| 269 | static char envbuffer[KDB_ENVBUFSIZE]; |
| 270 | static int envbufsize; |
| 271 | char *ep = NULL; |
| 272 | |
| 273 | if ((KDB_ENVBUFSIZE - envbufsize) >= bytes) { |
| 274 | ep = &envbuffer[envbufsize]; |
| 275 | envbufsize += bytes; |
| 276 | } |
| 277 | return ep; |
| 278 | } |
| 279 | |
| 280 | /* |
| 281 | * kdbgetulenv - This function will return the value of an unsigned |
| 282 | * long-valued environment variable. |
| 283 | * Parameters: |
| 284 | * match A character string representing a numeric value |
| 285 | * Outputs: |
| 286 | * *value the unsigned long represntation of the env variable 'match' |
| 287 | * Returns: |
| 288 | * Zero on success, a kdb diagnostic on failure. |
| 289 | */ |
| 290 | static int kdbgetulenv(const char *match, unsigned long *value) |
| 291 | { |
| 292 | char *ep; |
| 293 | |
| 294 | ep = kdbgetenv(match); |
| 295 | if (!ep) |
| 296 | return KDB_NOTENV; |
| 297 | if (strlen(ep) == 0) |
| 298 | return KDB_NOENVVALUE; |
| 299 | |
| 300 | *value = simple_strtoul(ep, NULL, 0); |
| 301 | |
| 302 | return 0; |
| 303 | } |
| 304 | |
| 305 | /* |
| 306 | * kdbgetintenv - This function will return the value of an |
| 307 | * integer-valued environment variable. |
| 308 | * Parameters: |
| 309 | * match A character string representing an integer-valued env variable |
| 310 | * Outputs: |
| 311 | * *value the integer representation of the environment variable 'match' |
| 312 | * Returns: |
| 313 | * Zero on success, a kdb diagnostic on failure. |
| 314 | */ |
| 315 | int kdbgetintenv(const char *match, int *value) |
| 316 | { |
| 317 | unsigned long val; |
| 318 | int diag; |
| 319 | |
| 320 | diag = kdbgetulenv(match, &val); |
| 321 | if (!diag) |
| 322 | *value = (int) val; |
| 323 | return diag; |
| 324 | } |
| 325 | |
| 326 | /* |
| 327 | * kdbgetularg - This function will convert a numeric string into an |
| 328 | * unsigned long value. |
| 329 | * Parameters: |
| 330 | * arg A character string representing a numeric value |
| 331 | * Outputs: |
| 332 | * *value the unsigned long represntation of arg. |
| 333 | * Returns: |
| 334 | * Zero on success, a kdb diagnostic on failure. |
| 335 | */ |
| 336 | int kdbgetularg(const char *arg, unsigned long *value) |
| 337 | { |
| 338 | char *endp; |
| 339 | unsigned long val; |
| 340 | |
| 341 | val = simple_strtoul(arg, &endp, 0); |
| 342 | |
| 343 | if (endp == arg) { |
| 344 | /* |
Jason Wessel | 534af10 | 2010-08-05 09:22:20 -0500 | [diff] [blame] | 345 | * Also try base 16, for us folks too lazy to type the |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 346 | * leading 0x... |
| 347 | */ |
| 348 | val = simple_strtoul(arg, &endp, 16); |
| 349 | if (endp == arg) |
| 350 | return KDB_BADINT; |
| 351 | } |
| 352 | |
| 353 | *value = val; |
| 354 | |
| 355 | return 0; |
| 356 | } |
| 357 | |
Jason Wessel | 534af10 | 2010-08-05 09:22:20 -0500 | [diff] [blame] | 358 | int kdbgetu64arg(const char *arg, u64 *value) |
| 359 | { |
| 360 | char *endp; |
| 361 | u64 val; |
| 362 | |
| 363 | val = simple_strtoull(arg, &endp, 0); |
| 364 | |
| 365 | if (endp == arg) { |
| 366 | |
| 367 | val = simple_strtoull(arg, &endp, 16); |
| 368 | if (endp == arg) |
| 369 | return KDB_BADINT; |
| 370 | } |
| 371 | |
| 372 | *value = val; |
| 373 | |
| 374 | return 0; |
| 375 | } |
| 376 | |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 377 | /* |
| 378 | * kdb_set - This function implements the 'set' command. Alter an |
| 379 | * existing environment variable or create a new one. |
| 380 | */ |
| 381 | int kdb_set(int argc, const char **argv) |
| 382 | { |
| 383 | int i; |
| 384 | char *ep; |
| 385 | size_t varlen, vallen; |
| 386 | |
| 387 | /* |
| 388 | * we can be invoked two ways: |
| 389 | * set var=value argv[1]="var", argv[2]="value" |
| 390 | * set var = value argv[1]="var", argv[2]="=", argv[3]="value" |
| 391 | * - if the latter, shift 'em down. |
| 392 | */ |
| 393 | if (argc == 3) { |
| 394 | argv[2] = argv[3]; |
| 395 | argc--; |
| 396 | } |
| 397 | |
| 398 | if (argc != 2) |
| 399 | return KDB_ARGCOUNT; |
| 400 | |
| 401 | /* |
| 402 | * Check for internal variables |
| 403 | */ |
| 404 | if (strcmp(argv[1], "KDBDEBUG") == 0) { |
| 405 | unsigned int debugflags; |
| 406 | char *cp; |
| 407 | |
| 408 | debugflags = simple_strtoul(argv[2], &cp, 0); |
| 409 | if (cp == argv[2] || debugflags & ~KDB_DEBUG_FLAG_MASK) { |
| 410 | kdb_printf("kdb: illegal debug flags '%s'\n", |
| 411 | argv[2]); |
| 412 | return 0; |
| 413 | } |
| 414 | kdb_flags = (kdb_flags & |
| 415 | ~(KDB_DEBUG_FLAG_MASK << KDB_DEBUG_FLAG_SHIFT)) |
| 416 | | (debugflags << KDB_DEBUG_FLAG_SHIFT); |
| 417 | |
| 418 | return 0; |
| 419 | } |
| 420 | |
| 421 | /* |
| 422 | * Tokenizer squashed the '=' sign. argv[1] is variable |
| 423 | * name, argv[2] = value. |
| 424 | */ |
| 425 | varlen = strlen(argv[1]); |
| 426 | vallen = strlen(argv[2]); |
| 427 | ep = kdballocenv(varlen + vallen + 2); |
| 428 | if (ep == (char *)0) |
| 429 | return KDB_ENVBUFFULL; |
| 430 | |
| 431 | sprintf(ep, "%s=%s", argv[1], argv[2]); |
| 432 | |
| 433 | ep[varlen+vallen+1] = '\0'; |
| 434 | |
| 435 | for (i = 0; i < __nenv; i++) { |
| 436 | if (__env[i] |
| 437 | && ((strncmp(__env[i], argv[1], varlen) == 0) |
| 438 | && ((__env[i][varlen] == '\0') |
| 439 | || (__env[i][varlen] == '=')))) { |
| 440 | __env[i] = ep; |
| 441 | return 0; |
| 442 | } |
| 443 | } |
| 444 | |
| 445 | /* |
| 446 | * Wasn't existing variable. Fit into slot. |
| 447 | */ |
| 448 | for (i = 0; i < __nenv-1; i++) { |
| 449 | if (__env[i] == (char *)0) { |
| 450 | __env[i] = ep; |
| 451 | return 0; |
| 452 | } |
| 453 | } |
| 454 | |
| 455 | return KDB_ENVFULL; |
| 456 | } |
| 457 | |
| 458 | static int kdb_check_regs(void) |
| 459 | { |
| 460 | if (!kdb_current_regs) { |
| 461 | kdb_printf("No current kdb registers." |
| 462 | " You may need to select another task\n"); |
| 463 | return KDB_BADREG; |
| 464 | } |
| 465 | return 0; |
| 466 | } |
| 467 | |
| 468 | /* |
| 469 | * kdbgetaddrarg - This function is responsible for parsing an |
| 470 | * address-expression and returning the value of the expression, |
| 471 | * symbol name, and offset to the caller. |
| 472 | * |
| 473 | * The argument may consist of a numeric value (decimal or |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 474 | * hexidecimal), a symbol name, a register name (preceded by the |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 475 | * percent sign), an environment variable with a numeric value |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 476 | * (preceded by a dollar sign) or a simple arithmetic expression |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 477 | * consisting of a symbol name, +/-, and a numeric constant value |
| 478 | * (offset). |
| 479 | * Parameters: |
| 480 | * argc - count of arguments in argv |
| 481 | * argv - argument vector |
| 482 | * *nextarg - index to next unparsed argument in argv[] |
| 483 | * regs - Register state at time of KDB entry |
| 484 | * Outputs: |
| 485 | * *value - receives the value of the address-expression |
| 486 | * *offset - receives the offset specified, if any |
| 487 | * *name - receives the symbol name, if any |
| 488 | * *nextarg - index to next unparsed argument in argv[] |
| 489 | * Returns: |
| 490 | * zero is returned on success, a kdb diagnostic code is |
| 491 | * returned on error. |
| 492 | */ |
| 493 | int kdbgetaddrarg(int argc, const char **argv, int *nextarg, |
| 494 | unsigned long *value, long *offset, |
| 495 | char **name) |
| 496 | { |
| 497 | unsigned long addr; |
| 498 | unsigned long off = 0; |
| 499 | int positive; |
| 500 | int diag; |
| 501 | int found = 0; |
| 502 | char *symname; |
| 503 | char symbol = '\0'; |
| 504 | char *cp; |
| 505 | kdb_symtab_t symtab; |
| 506 | |
| 507 | /* |
Anton Vorontsov | 420c2b1 | 2014-11-06 14:36:46 +0000 | [diff] [blame] | 508 | * If the enable flags prohibit both arbitrary memory access |
| 509 | * and flow control then there are no reasonable grounds to |
| 510 | * provide symbol lookup. |
| 511 | */ |
| 512 | if (!kdb_check_flags(KDB_ENABLE_MEM_READ | KDB_ENABLE_FLOW_CTRL, |
| 513 | kdb_cmd_enabled, false)) |
| 514 | return KDB_NOPERM; |
| 515 | |
| 516 | /* |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 517 | * Process arguments which follow the following syntax: |
| 518 | * |
| 519 | * symbol | numeric-address [+/- numeric-offset] |
| 520 | * %register |
| 521 | * $environment-variable |
| 522 | */ |
| 523 | |
| 524 | if (*nextarg > argc) |
| 525 | return KDB_ARGCOUNT; |
| 526 | |
| 527 | symname = (char *)argv[*nextarg]; |
| 528 | |
| 529 | /* |
| 530 | * If there is no whitespace between the symbol |
| 531 | * or address and the '+' or '-' symbols, we |
| 532 | * remember the character and replace it with a |
| 533 | * null so the symbol/value can be properly parsed |
| 534 | */ |
| 535 | cp = strpbrk(symname, "+-"); |
| 536 | if (cp != NULL) { |
| 537 | symbol = *cp; |
| 538 | *cp++ = '\0'; |
| 539 | } |
| 540 | |
| 541 | if (symname[0] == '$') { |
| 542 | diag = kdbgetulenv(&symname[1], &addr); |
| 543 | if (diag) |
| 544 | return diag; |
| 545 | } else if (symname[0] == '%') { |
| 546 | diag = kdb_check_regs(); |
| 547 | if (diag) |
| 548 | return diag; |
| 549 | /* Implement register values with % at a later time as it is |
| 550 | * arch optional. |
| 551 | */ |
| 552 | return KDB_NOTIMP; |
| 553 | } else { |
| 554 | found = kdbgetsymval(symname, &symtab); |
| 555 | if (found) { |
| 556 | addr = symtab.sym_start; |
| 557 | } else { |
| 558 | diag = kdbgetularg(argv[*nextarg], &addr); |
| 559 | if (diag) |
| 560 | return diag; |
| 561 | } |
| 562 | } |
| 563 | |
| 564 | if (!found) |
| 565 | found = kdbnearsym(addr, &symtab); |
| 566 | |
| 567 | (*nextarg)++; |
| 568 | |
| 569 | if (name) |
| 570 | *name = symname; |
| 571 | if (value) |
| 572 | *value = addr; |
| 573 | if (offset && name && *name) |
| 574 | *offset = addr - symtab.sym_start; |
| 575 | |
| 576 | if ((*nextarg > argc) |
| 577 | && (symbol == '\0')) |
| 578 | return 0; |
| 579 | |
| 580 | /* |
| 581 | * check for +/- and offset |
| 582 | */ |
| 583 | |
| 584 | if (symbol == '\0') { |
| 585 | if ((argv[*nextarg][0] != '+') |
| 586 | && (argv[*nextarg][0] != '-')) { |
| 587 | /* |
| 588 | * Not our argument. Return. |
| 589 | */ |
| 590 | return 0; |
| 591 | } else { |
| 592 | positive = (argv[*nextarg][0] == '+'); |
| 593 | (*nextarg)++; |
| 594 | } |
| 595 | } else |
| 596 | positive = (symbol == '+'); |
| 597 | |
| 598 | /* |
| 599 | * Now there must be an offset! |
| 600 | */ |
| 601 | if ((*nextarg > argc) |
| 602 | && (symbol == '\0')) { |
| 603 | return KDB_INVADDRFMT; |
| 604 | } |
| 605 | |
| 606 | if (!symbol) { |
| 607 | cp = (char *)argv[*nextarg]; |
| 608 | (*nextarg)++; |
| 609 | } |
| 610 | |
| 611 | diag = kdbgetularg(cp, &off); |
| 612 | if (diag) |
| 613 | return diag; |
| 614 | |
| 615 | if (!positive) |
| 616 | off = -off; |
| 617 | |
| 618 | if (offset) |
| 619 | *offset += off; |
| 620 | |
| 621 | if (value) |
| 622 | *value += off; |
| 623 | |
| 624 | return 0; |
| 625 | } |
| 626 | |
| 627 | static void kdb_cmderror(int diag) |
| 628 | { |
| 629 | int i; |
| 630 | |
| 631 | if (diag >= 0) { |
| 632 | kdb_printf("no error detected (diagnostic is %d)\n", diag); |
| 633 | return; |
| 634 | } |
| 635 | |
| 636 | for (i = 0; i < __nkdb_err; i++) { |
| 637 | if (kdbmsgs[i].km_diag == diag) { |
| 638 | kdb_printf("diag: %d: %s\n", diag, kdbmsgs[i].km_msg); |
| 639 | return; |
| 640 | } |
| 641 | } |
| 642 | |
| 643 | kdb_printf("Unknown diag %d\n", -diag); |
| 644 | } |
| 645 | |
| 646 | /* |
| 647 | * kdb_defcmd, kdb_defcmd2 - This function implements the 'defcmd' |
| 648 | * command which defines one command as a set of other commands, |
| 649 | * terminated by endefcmd. kdb_defcmd processes the initial |
| 650 | * 'defcmd' command, kdb_defcmd2 is invoked from kdb_parse for |
| 651 | * the following commands until 'endefcmd'. |
| 652 | * Inputs: |
| 653 | * argc argument count |
| 654 | * argv argument vector |
| 655 | * Returns: |
| 656 | * zero for success, a kdb diagnostic if error |
| 657 | */ |
| 658 | struct defcmd_set { |
| 659 | int count; |
| 660 | int usable; |
| 661 | char *name; |
| 662 | char *usage; |
| 663 | char *help; |
| 664 | char **command; |
| 665 | }; |
| 666 | static struct defcmd_set *defcmd_set; |
| 667 | static int defcmd_set_count; |
| 668 | static int defcmd_in_progress; |
| 669 | |
| 670 | /* Forward references */ |
| 671 | static int kdb_exec_defcmd(int argc, const char **argv); |
| 672 | |
| 673 | static int kdb_defcmd2(const char *cmdstr, const char *argv0) |
| 674 | { |
| 675 | struct defcmd_set *s = defcmd_set + defcmd_set_count - 1; |
| 676 | char **save_command = s->command; |
| 677 | if (strcmp(argv0, "endefcmd") == 0) { |
| 678 | defcmd_in_progress = 0; |
| 679 | if (!s->count) |
| 680 | s->usable = 0; |
| 681 | if (s->usable) |
Daniel Thompson | 9452e97 | 2014-11-06 14:36:45 +0000 | [diff] [blame] | 682 | /* macros are always safe because when executed each |
| 683 | * internal command re-enters kdb_parse() and is |
| 684 | * safety checked individually. |
| 685 | */ |
| 686 | kdb_register_flags(s->name, kdb_exec_defcmd, s->usage, |
| 687 | s->help, 0, |
| 688 | KDB_ENABLE_ALWAYS_SAFE); |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 689 | return 0; |
| 690 | } |
| 691 | if (!s->usable) |
| 692 | return KDB_NOTIMP; |
Jovi Zhang | 5450d90 | 2010-11-10 07:22:18 -0600 | [diff] [blame] | 693 | s->command = kzalloc((s->count + 1) * sizeof(*(s->command)), GFP_KDB); |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 694 | if (!s->command) { |
| 695 | kdb_printf("Could not allocate new kdb_defcmd table for %s\n", |
| 696 | cmdstr); |
| 697 | s->usable = 0; |
| 698 | return KDB_NOTIMP; |
| 699 | } |
| 700 | memcpy(s->command, save_command, s->count * sizeof(*(s->command))); |
| 701 | s->command[s->count++] = kdb_strdup(cmdstr, GFP_KDB); |
| 702 | kfree(save_command); |
| 703 | return 0; |
| 704 | } |
| 705 | |
| 706 | static int kdb_defcmd(int argc, const char **argv) |
| 707 | { |
| 708 | struct defcmd_set *save_defcmd_set = defcmd_set, *s; |
| 709 | if (defcmd_in_progress) { |
| 710 | kdb_printf("kdb: nested defcmd detected, assuming missing " |
| 711 | "endefcmd\n"); |
| 712 | kdb_defcmd2("endefcmd", "endefcmd"); |
| 713 | } |
| 714 | if (argc == 0) { |
| 715 | int i; |
| 716 | for (s = defcmd_set; s < defcmd_set + defcmd_set_count; ++s) { |
| 717 | kdb_printf("defcmd %s \"%s\" \"%s\"\n", s->name, |
| 718 | s->usage, s->help); |
| 719 | for (i = 0; i < s->count; ++i) |
| 720 | kdb_printf("%s", s->command[i]); |
| 721 | kdb_printf("endefcmd\n"); |
| 722 | } |
| 723 | return 0; |
| 724 | } |
| 725 | if (argc != 3) |
| 726 | return KDB_ARGCOUNT; |
Jason Wessel | a37372f | 2013-02-04 10:35:33 -0600 | [diff] [blame] | 727 | if (in_dbg_master()) { |
| 728 | kdb_printf("Command only available during kdb_init()\n"); |
| 729 | return KDB_NOTIMP; |
| 730 | } |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 731 | defcmd_set = kmalloc((defcmd_set_count + 1) * sizeof(*defcmd_set), |
| 732 | GFP_KDB); |
Jason Wessel | 4eb7a66 | 2013-02-03 09:32:28 -0600 | [diff] [blame] | 733 | if (!defcmd_set) |
| 734 | goto fail_defcmd; |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 735 | memcpy(defcmd_set, save_defcmd_set, |
| 736 | defcmd_set_count * sizeof(*defcmd_set)); |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 737 | s = defcmd_set + defcmd_set_count; |
| 738 | memset(s, 0, sizeof(*s)); |
| 739 | s->usable = 1; |
| 740 | s->name = kdb_strdup(argv[1], GFP_KDB); |
Jason Wessel | 4eb7a66 | 2013-02-03 09:32:28 -0600 | [diff] [blame] | 741 | if (!s->name) |
| 742 | goto fail_name; |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 743 | s->usage = kdb_strdup(argv[2], GFP_KDB); |
Jason Wessel | 4eb7a66 | 2013-02-03 09:32:28 -0600 | [diff] [blame] | 744 | if (!s->usage) |
| 745 | goto fail_usage; |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 746 | s->help = kdb_strdup(argv[3], GFP_KDB); |
Jason Wessel | 4eb7a66 | 2013-02-03 09:32:28 -0600 | [diff] [blame] | 747 | if (!s->help) |
| 748 | goto fail_help; |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 749 | if (s->usage[0] == '"') { |
Jason Wessel | 4eb7a66 | 2013-02-03 09:32:28 -0600 | [diff] [blame] | 750 | strcpy(s->usage, argv[2]+1); |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 751 | s->usage[strlen(s->usage)-1] = '\0'; |
| 752 | } |
| 753 | if (s->help[0] == '"') { |
Jason Wessel | 4eb7a66 | 2013-02-03 09:32:28 -0600 | [diff] [blame] | 754 | strcpy(s->help, argv[3]+1); |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 755 | s->help[strlen(s->help)-1] = '\0'; |
| 756 | } |
| 757 | ++defcmd_set_count; |
| 758 | defcmd_in_progress = 1; |
Jason Wessel | 4eb7a66 | 2013-02-03 09:32:28 -0600 | [diff] [blame] | 759 | kfree(save_defcmd_set); |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 760 | return 0; |
Jason Wessel | 4eb7a66 | 2013-02-03 09:32:28 -0600 | [diff] [blame] | 761 | fail_help: |
| 762 | kfree(s->usage); |
| 763 | fail_usage: |
| 764 | kfree(s->name); |
| 765 | fail_name: |
| 766 | kfree(defcmd_set); |
| 767 | fail_defcmd: |
| 768 | kdb_printf("Could not allocate new defcmd_set entry for %s\n", argv[1]); |
| 769 | defcmd_set = save_defcmd_set; |
| 770 | return KDB_NOTIMP; |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 771 | } |
| 772 | |
| 773 | /* |
| 774 | * kdb_exec_defcmd - Execute the set of commands associated with this |
| 775 | * defcmd name. |
| 776 | * Inputs: |
| 777 | * argc argument count |
| 778 | * argv argument vector |
| 779 | * Returns: |
| 780 | * zero for success, a kdb diagnostic if error |
| 781 | */ |
| 782 | static int kdb_exec_defcmd(int argc, const char **argv) |
| 783 | { |
| 784 | int i, ret; |
| 785 | struct defcmd_set *s; |
| 786 | if (argc != 0) |
| 787 | return KDB_ARGCOUNT; |
| 788 | for (s = defcmd_set, i = 0; i < defcmd_set_count; ++i, ++s) { |
| 789 | if (strcmp(s->name, argv[0]) == 0) |
| 790 | break; |
| 791 | } |
| 792 | if (i == defcmd_set_count) { |
| 793 | kdb_printf("kdb_exec_defcmd: could not find commands for %s\n", |
| 794 | argv[0]); |
| 795 | return KDB_NOTIMP; |
| 796 | } |
| 797 | for (i = 0; i < s->count; ++i) { |
| 798 | /* Recursive use of kdb_parse, do not use argv after |
| 799 | * this point */ |
| 800 | argv = NULL; |
| 801 | kdb_printf("[%s]kdb> %s\n", s->name, s->command[i]); |
| 802 | ret = kdb_parse(s->command[i]); |
| 803 | if (ret) |
| 804 | return ret; |
| 805 | } |
| 806 | return 0; |
| 807 | } |
| 808 | |
| 809 | /* Command history */ |
| 810 | #define KDB_CMD_HISTORY_COUNT 32 |
| 811 | #define CMD_BUFLEN 200 /* kdb_printf: max printline |
| 812 | * size == 256 */ |
| 813 | static unsigned int cmd_head, cmd_tail; |
| 814 | static unsigned int cmdptr; |
| 815 | static char cmd_hist[KDB_CMD_HISTORY_COUNT][CMD_BUFLEN]; |
| 816 | static char cmd_cur[CMD_BUFLEN]; |
| 817 | |
| 818 | /* |
| 819 | * The "str" argument may point to something like | grep xyz |
| 820 | */ |
| 821 | static void parse_grep(const char *str) |
| 822 | { |
| 823 | int len; |
| 824 | char *cp = (char *)str, *cp2; |
| 825 | |
| 826 | /* sanity check: we should have been called with the \ first */ |
| 827 | if (*cp != '|') |
| 828 | return; |
| 829 | cp++; |
| 830 | while (isspace(*cp)) |
| 831 | cp++; |
| 832 | if (strncmp(cp, "grep ", 5)) { |
| 833 | kdb_printf("invalid 'pipe', see grephelp\n"); |
| 834 | return; |
| 835 | } |
| 836 | cp += 5; |
| 837 | while (isspace(*cp)) |
| 838 | cp++; |
| 839 | cp2 = strchr(cp, '\n'); |
| 840 | if (cp2) |
| 841 | *cp2 = '\0'; /* remove the trailing newline */ |
| 842 | len = strlen(cp); |
| 843 | if (len == 0) { |
| 844 | kdb_printf("invalid 'pipe', see grephelp\n"); |
| 845 | return; |
| 846 | } |
| 847 | /* now cp points to a nonzero length search string */ |
| 848 | if (*cp == '"') { |
| 849 | /* allow it be "x y z" by removing the "'s - there must |
| 850 | be two of them */ |
| 851 | cp++; |
| 852 | cp2 = strchr(cp, '"'); |
| 853 | if (!cp2) { |
| 854 | kdb_printf("invalid quoted string, see grephelp\n"); |
| 855 | return; |
| 856 | } |
| 857 | *cp2 = '\0'; /* end the string where the 2nd " was */ |
| 858 | } |
| 859 | kdb_grep_leading = 0; |
| 860 | if (*cp == '^') { |
| 861 | kdb_grep_leading = 1; |
| 862 | cp++; |
| 863 | } |
| 864 | len = strlen(cp); |
| 865 | kdb_grep_trailing = 0; |
| 866 | if (*(cp+len-1) == '$') { |
| 867 | kdb_grep_trailing = 1; |
| 868 | *(cp+len-1) = '\0'; |
| 869 | } |
| 870 | len = strlen(cp); |
| 871 | if (!len) |
| 872 | return; |
Daniel Thompson | fb6daa7 | 2014-09-11 10:37:10 +0100 | [diff] [blame] | 873 | if (len >= KDB_GREP_STRLEN) { |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 874 | kdb_printf("search string too long\n"); |
| 875 | return; |
| 876 | } |
| 877 | strcpy(kdb_grep_string, cp); |
| 878 | kdb_grepping_flag++; |
| 879 | return; |
| 880 | } |
| 881 | |
| 882 | /* |
| 883 | * kdb_parse - Parse the command line, search the command table for a |
| 884 | * matching command and invoke the command function. This |
| 885 | * function may be called recursively, if it is, the second call |
| 886 | * will overwrite argv and cbuf. It is the caller's |
| 887 | * responsibility to save their argv if they recursively call |
| 888 | * kdb_parse(). |
| 889 | * Parameters: |
| 890 | * cmdstr The input command line to be parsed. |
| 891 | * regs The registers at the time kdb was entered. |
| 892 | * Returns: |
| 893 | * Zero for success, a kdb diagnostic if failure. |
| 894 | * Remarks: |
| 895 | * Limited to 20 tokens. |
| 896 | * |
| 897 | * Real rudimentary tokenization. Basically only whitespace |
| 898 | * is considered a token delimeter (but special consideration |
| 899 | * is taken of the '=' sign as used by the 'set' command). |
| 900 | * |
| 901 | * The algorithm used to tokenize the input string relies on |
| 902 | * there being at least one whitespace (or otherwise useless) |
| 903 | * character between tokens as the character immediately following |
| 904 | * the token is altered in-place to a null-byte to terminate the |
| 905 | * token string. |
| 906 | */ |
| 907 | |
| 908 | #define MAXARGC 20 |
| 909 | |
| 910 | int kdb_parse(const char *cmdstr) |
| 911 | { |
| 912 | static char *argv[MAXARGC]; |
| 913 | static int argc; |
| 914 | static char cbuf[CMD_BUFLEN+2]; |
| 915 | char *cp; |
| 916 | char *cpp, quoted; |
| 917 | kdbtab_t *tp; |
Daniel Thompson | ab08e46 | 2014-09-11 09:58:29 +0100 | [diff] [blame] | 918 | int i, escaped, ignore_errors = 0, check_grep = 0; |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 919 | |
| 920 | /* |
| 921 | * First tokenize the command string. |
| 922 | */ |
| 923 | cp = (char *)cmdstr; |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 924 | |
| 925 | if (KDB_FLAG(CMD_INTERRUPT)) { |
| 926 | /* Previous command was interrupted, newline must not |
| 927 | * repeat the command */ |
| 928 | KDB_FLAG_CLEAR(CMD_INTERRUPT); |
| 929 | KDB_STATE_SET(PAGER); |
| 930 | argc = 0; /* no repeat */ |
| 931 | } |
| 932 | |
| 933 | if (*cp != '\n' && *cp != '\0') { |
| 934 | argc = 0; |
| 935 | cpp = cbuf; |
| 936 | while (*cp) { |
| 937 | /* skip whitespace */ |
| 938 | while (isspace(*cp)) |
| 939 | cp++; |
| 940 | if ((*cp == '\0') || (*cp == '\n') || |
| 941 | (*cp == '#' && !defcmd_in_progress)) |
| 942 | break; |
| 943 | /* special case: check for | grep pattern */ |
| 944 | if (*cp == '|') { |
| 945 | check_grep++; |
| 946 | break; |
| 947 | } |
| 948 | if (cpp >= cbuf + CMD_BUFLEN) { |
| 949 | kdb_printf("kdb_parse: command buffer " |
| 950 | "overflow, command ignored\n%s\n", |
| 951 | cmdstr); |
| 952 | return KDB_NOTFOUND; |
| 953 | } |
| 954 | if (argc >= MAXARGC - 1) { |
| 955 | kdb_printf("kdb_parse: too many arguments, " |
| 956 | "command ignored\n%s\n", cmdstr); |
| 957 | return KDB_NOTFOUND; |
| 958 | } |
| 959 | argv[argc++] = cpp; |
| 960 | escaped = 0; |
| 961 | quoted = '\0'; |
| 962 | /* Copy to next unquoted and unescaped |
| 963 | * whitespace or '=' */ |
| 964 | while (*cp && *cp != '\n' && |
| 965 | (escaped || quoted || !isspace(*cp))) { |
| 966 | if (cpp >= cbuf + CMD_BUFLEN) |
| 967 | break; |
| 968 | if (escaped) { |
| 969 | escaped = 0; |
| 970 | *cpp++ = *cp++; |
| 971 | continue; |
| 972 | } |
| 973 | if (*cp == '\\') { |
| 974 | escaped = 1; |
| 975 | ++cp; |
| 976 | continue; |
| 977 | } |
| 978 | if (*cp == quoted) |
| 979 | quoted = '\0'; |
| 980 | else if (*cp == '\'' || *cp == '"') |
| 981 | quoted = *cp; |
| 982 | *cpp = *cp++; |
| 983 | if (*cpp == '=' && !quoted) |
| 984 | break; |
| 985 | ++cpp; |
| 986 | } |
| 987 | *cpp++ = '\0'; /* Squash a ws or '=' character */ |
| 988 | } |
| 989 | } |
| 990 | if (!argc) |
| 991 | return 0; |
| 992 | if (check_grep) |
| 993 | parse_grep(cp); |
| 994 | if (defcmd_in_progress) { |
| 995 | int result = kdb_defcmd2(cmdstr, argv[0]); |
| 996 | if (!defcmd_in_progress) { |
| 997 | argc = 0; /* avoid repeat on endefcmd */ |
| 998 | *(argv[0]) = '\0'; |
| 999 | } |
| 1000 | return result; |
| 1001 | } |
| 1002 | if (argv[0][0] == '-' && argv[0][1] && |
| 1003 | (argv[0][1] < '0' || argv[0][1] > '9')) { |
| 1004 | ignore_errors = 1; |
| 1005 | ++argv[0]; |
| 1006 | } |
| 1007 | |
| 1008 | for_each_kdbcmd(tp, i) { |
| 1009 | if (tp->cmd_name) { |
| 1010 | /* |
| 1011 | * If this command is allowed to be abbreviated, |
| 1012 | * check to see if this is it. |
| 1013 | */ |
| 1014 | |
| 1015 | if (tp->cmd_minlen |
| 1016 | && (strlen(argv[0]) <= tp->cmd_minlen)) { |
| 1017 | if (strncmp(argv[0], |
| 1018 | tp->cmd_name, |
| 1019 | tp->cmd_minlen) == 0) { |
| 1020 | break; |
| 1021 | } |
| 1022 | } |
| 1023 | |
| 1024 | if (strcmp(argv[0], tp->cmd_name) == 0) |
| 1025 | break; |
| 1026 | } |
| 1027 | } |
| 1028 | |
| 1029 | /* |
| 1030 | * If we don't find a command by this name, see if the first |
| 1031 | * few characters of this match any of the known commands. |
| 1032 | * e.g., md1c20 should match md. |
| 1033 | */ |
| 1034 | if (i == kdb_max_commands) { |
| 1035 | for_each_kdbcmd(tp, i) { |
| 1036 | if (tp->cmd_name) { |
| 1037 | if (strncmp(argv[0], |
| 1038 | tp->cmd_name, |
| 1039 | strlen(tp->cmd_name)) == 0) { |
| 1040 | break; |
| 1041 | } |
| 1042 | } |
| 1043 | } |
| 1044 | } |
| 1045 | |
| 1046 | if (i < kdb_max_commands) { |
| 1047 | int result; |
Anton Vorontsov | 420c2b1 | 2014-11-06 14:36:46 +0000 | [diff] [blame] | 1048 | |
| 1049 | if (!kdb_check_flags(tp->cmd_flags, kdb_cmd_enabled, argc <= 1)) |
| 1050 | return KDB_NOPERM; |
| 1051 | |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 1052 | KDB_STATE_SET(CMD); |
| 1053 | result = (*tp->cmd_func)(argc-1, (const char **)argv); |
| 1054 | if (result && ignore_errors && result > KDB_CMD_GO) |
| 1055 | result = 0; |
| 1056 | KDB_STATE_CLEAR(CMD); |
Anton Vorontsov | 04bb171 | 2014-11-06 14:36:43 +0000 | [diff] [blame] | 1057 | |
| 1058 | if (tp->cmd_flags & KDB_REPEAT_WITH_ARGS) |
| 1059 | return result; |
| 1060 | |
| 1061 | argc = tp->cmd_flags & KDB_REPEAT_NO_ARGS ? 1 : 0; |
| 1062 | if (argv[argc]) |
| 1063 | *(argv[argc]) = '\0'; |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 1064 | return result; |
| 1065 | } |
| 1066 | |
| 1067 | /* |
| 1068 | * If the input with which we were presented does not |
| 1069 | * map to an existing command, attempt to parse it as an |
| 1070 | * address argument and display the result. Useful for |
| 1071 | * obtaining the address of a variable, or the nearest symbol |
| 1072 | * to an address contained in a register. |
| 1073 | */ |
| 1074 | { |
| 1075 | unsigned long value; |
| 1076 | char *name = NULL; |
| 1077 | long offset; |
| 1078 | int nextarg = 0; |
| 1079 | |
| 1080 | if (kdbgetaddrarg(0, (const char **)argv, &nextarg, |
| 1081 | &value, &offset, &name)) { |
| 1082 | return KDB_NOTFOUND; |
| 1083 | } |
| 1084 | |
| 1085 | kdb_printf("%s = ", argv[0]); |
| 1086 | kdb_symbol_print(value, NULL, KDB_SP_DEFAULT); |
| 1087 | kdb_printf("\n"); |
| 1088 | return 0; |
| 1089 | } |
| 1090 | } |
| 1091 | |
| 1092 | |
| 1093 | static int handle_ctrl_cmd(char *cmd) |
| 1094 | { |
| 1095 | #define CTRL_P 16 |
| 1096 | #define CTRL_N 14 |
| 1097 | |
| 1098 | /* initial situation */ |
| 1099 | if (cmd_head == cmd_tail) |
| 1100 | return 0; |
| 1101 | switch (*cmd) { |
| 1102 | case CTRL_P: |
| 1103 | if (cmdptr != cmd_tail) |
| 1104 | cmdptr = (cmdptr-1) % KDB_CMD_HISTORY_COUNT; |
| 1105 | strncpy(cmd_cur, cmd_hist[cmdptr], CMD_BUFLEN); |
| 1106 | return 1; |
| 1107 | case CTRL_N: |
| 1108 | if (cmdptr != cmd_head) |
| 1109 | cmdptr = (cmdptr+1) % KDB_CMD_HISTORY_COUNT; |
| 1110 | strncpy(cmd_cur, cmd_hist[cmdptr], CMD_BUFLEN); |
| 1111 | return 1; |
| 1112 | } |
| 1113 | return 0; |
| 1114 | } |
| 1115 | |
| 1116 | /* |
| 1117 | * kdb_reboot - This function implements the 'reboot' command. Reboot |
| 1118 | * the system immediately, or loop for ever on failure. |
| 1119 | */ |
| 1120 | static int kdb_reboot(int argc, const char **argv) |
| 1121 | { |
| 1122 | emergency_restart(); |
| 1123 | kdb_printf("Hmm, kdb_reboot did not reboot, spinning here\n"); |
| 1124 | while (1) |
| 1125 | cpu_relax(); |
| 1126 | /* NOTREACHED */ |
| 1127 | return 0; |
| 1128 | } |
| 1129 | |
| 1130 | static void kdb_dumpregs(struct pt_regs *regs) |
| 1131 | { |
| 1132 | int old_lvl = console_loglevel; |
Borislav Petkov | a8fe19e | 2014-06-04 16:11:46 -0700 | [diff] [blame] | 1133 | console_loglevel = CONSOLE_LOGLEVEL_MOTORMOUTH; |
Jason Wessel | d37d39a | 2010-05-20 21:04:27 -0500 | [diff] [blame] | 1134 | kdb_trap_printk++; |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 1135 | show_regs(regs); |
Jason Wessel | d37d39a | 2010-05-20 21:04:27 -0500 | [diff] [blame] | 1136 | kdb_trap_printk--; |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 1137 | kdb_printf("\n"); |
| 1138 | console_loglevel = old_lvl; |
| 1139 | } |
| 1140 | |
| 1141 | void kdb_set_current_task(struct task_struct *p) |
| 1142 | { |
| 1143 | kdb_current_task = p; |
| 1144 | |
| 1145 | if (kdb_task_has_cpu(p)) { |
| 1146 | kdb_current_regs = KDB_TSKREGS(kdb_process_cpu(p)); |
| 1147 | return; |
| 1148 | } |
| 1149 | kdb_current_regs = NULL; |
| 1150 | } |
| 1151 | |
| 1152 | /* |
| 1153 | * kdb_local - The main code for kdb. This routine is invoked on a |
| 1154 | * specific processor, it is not global. The main kdb() routine |
| 1155 | * ensures that only one processor at a time is in this routine. |
| 1156 | * This code is called with the real reason code on the first |
| 1157 | * entry to a kdb session, thereafter it is called with reason |
| 1158 | * SWITCH, even if the user goes back to the original cpu. |
| 1159 | * Inputs: |
| 1160 | * reason The reason KDB was invoked |
| 1161 | * error The hardware-defined error code |
| 1162 | * regs The exception frame at time of fault/breakpoint. |
| 1163 | * db_result Result code from the break or debug point. |
| 1164 | * Returns: |
| 1165 | * 0 KDB was invoked for an event which it wasn't responsible |
| 1166 | * 1 KDB handled the event for which it was invoked. |
| 1167 | * KDB_CMD_GO User typed 'go'. |
| 1168 | * KDB_CMD_CPU User switched to another cpu. |
| 1169 | * KDB_CMD_SS Single step. |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 1170 | */ |
| 1171 | static int kdb_local(kdb_reason_t reason, int error, struct pt_regs *regs, |
| 1172 | kdb_dbtrap_t db_result) |
| 1173 | { |
| 1174 | char *cmdbuf; |
| 1175 | int diag; |
| 1176 | struct task_struct *kdb_current = |
| 1177 | kdb_curr_task(raw_smp_processor_id()); |
| 1178 | |
| 1179 | KDB_DEBUG_STATE("kdb_local 1", reason); |
| 1180 | kdb_go_count = 0; |
| 1181 | if (reason == KDB_REASON_DEBUG) { |
| 1182 | /* special case below */ |
| 1183 | } else { |
| 1184 | kdb_printf("\nEntering kdb (current=0x%p, pid %d) ", |
Jason Wessel | 578bd4d | 2010-10-29 13:14:41 -0500 | [diff] [blame] | 1185 | kdb_current, kdb_current ? kdb_current->pid : 0); |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 1186 | #if defined(CONFIG_SMP) |
| 1187 | kdb_printf("on processor %d ", raw_smp_processor_id()); |
| 1188 | #endif |
| 1189 | } |
| 1190 | |
| 1191 | switch (reason) { |
| 1192 | case KDB_REASON_DEBUG: |
| 1193 | { |
| 1194 | /* |
| 1195 | * If re-entering kdb after a single step |
| 1196 | * command, don't print the message. |
| 1197 | */ |
| 1198 | switch (db_result) { |
| 1199 | case KDB_DB_BPT: |
| 1200 | kdb_printf("\nEntering kdb (0x%p, pid %d) ", |
| 1201 | kdb_current, kdb_current->pid); |
| 1202 | #if defined(CONFIG_SMP) |
| 1203 | kdb_printf("on processor %d ", raw_smp_processor_id()); |
| 1204 | #endif |
| 1205 | kdb_printf("due to Debug @ " kdb_machreg_fmt "\n", |
| 1206 | instruction_pointer(regs)); |
| 1207 | break; |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 1208 | case KDB_DB_SS: |
| 1209 | break; |
| 1210 | case KDB_DB_SSBPT: |
| 1211 | KDB_DEBUG_STATE("kdb_local 4", reason); |
| 1212 | return 1; /* kdba_db_trap did the work */ |
| 1213 | default: |
| 1214 | kdb_printf("kdb: Bad result from kdba_db_trap: %d\n", |
| 1215 | db_result); |
| 1216 | break; |
| 1217 | } |
| 1218 | |
| 1219 | } |
| 1220 | break; |
| 1221 | case KDB_REASON_ENTER: |
| 1222 | if (KDB_STATE(KEYBOARD)) |
| 1223 | kdb_printf("due to Keyboard Entry\n"); |
| 1224 | else |
| 1225 | kdb_printf("due to KDB_ENTER()\n"); |
| 1226 | break; |
| 1227 | case KDB_REASON_KEYBOARD: |
| 1228 | KDB_STATE_SET(KEYBOARD); |
| 1229 | kdb_printf("due to Keyboard Entry\n"); |
| 1230 | break; |
| 1231 | case KDB_REASON_ENTER_SLAVE: |
| 1232 | /* drop through, slaves only get released via cpu switch */ |
| 1233 | case KDB_REASON_SWITCH: |
| 1234 | kdb_printf("due to cpu switch\n"); |
| 1235 | break; |
| 1236 | case KDB_REASON_OOPS: |
| 1237 | kdb_printf("Oops: %s\n", kdb_diemsg); |
| 1238 | kdb_printf("due to oops @ " kdb_machreg_fmt "\n", |
| 1239 | instruction_pointer(regs)); |
| 1240 | kdb_dumpregs(regs); |
| 1241 | break; |
Mike Travis | 8daaa5f | 2013-10-02 10:14:18 -0500 | [diff] [blame] | 1242 | case KDB_REASON_SYSTEM_NMI: |
| 1243 | kdb_printf("due to System NonMaskable Interrupt\n"); |
| 1244 | break; |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 1245 | case KDB_REASON_NMI: |
| 1246 | kdb_printf("due to NonMaskable Interrupt @ " |
| 1247 | kdb_machreg_fmt "\n", |
| 1248 | instruction_pointer(regs)); |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 1249 | break; |
| 1250 | case KDB_REASON_SSTEP: |
| 1251 | case KDB_REASON_BREAK: |
| 1252 | kdb_printf("due to %s @ " kdb_machreg_fmt "\n", |
| 1253 | reason == KDB_REASON_BREAK ? |
| 1254 | "Breakpoint" : "SS trap", instruction_pointer(regs)); |
| 1255 | /* |
| 1256 | * Determine if this breakpoint is one that we |
| 1257 | * are interested in. |
| 1258 | */ |
| 1259 | if (db_result != KDB_DB_BPT) { |
| 1260 | kdb_printf("kdb: error return from kdba_bp_trap: %d\n", |
| 1261 | db_result); |
| 1262 | KDB_DEBUG_STATE("kdb_local 6", reason); |
| 1263 | return 0; /* Not for us, dismiss it */ |
| 1264 | } |
| 1265 | break; |
| 1266 | case KDB_REASON_RECURSE: |
| 1267 | kdb_printf("due to Recursion @ " kdb_machreg_fmt "\n", |
| 1268 | instruction_pointer(regs)); |
| 1269 | break; |
| 1270 | default: |
| 1271 | kdb_printf("kdb: unexpected reason code: %d\n", reason); |
| 1272 | KDB_DEBUG_STATE("kdb_local 8", reason); |
| 1273 | return 0; /* Not for us, dismiss it */ |
| 1274 | } |
| 1275 | |
| 1276 | while (1) { |
| 1277 | /* |
| 1278 | * Initialize pager context. |
| 1279 | */ |
| 1280 | kdb_nextline = 1; |
| 1281 | KDB_STATE_CLEAR(SUPPRESS); |
Daniel Thompson | ab08e46 | 2014-09-11 09:58:29 +0100 | [diff] [blame] | 1282 | kdb_grepping_flag = 0; |
Daniel Thompson | fb6daa7 | 2014-09-11 10:37:10 +0100 | [diff] [blame] | 1283 | /* ensure the old search does not leak into '/' commands */ |
| 1284 | kdb_grep_string[0] = '\0'; |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 1285 | |
| 1286 | cmdbuf = cmd_cur; |
| 1287 | *cmdbuf = '\0'; |
| 1288 | *(cmd_hist[cmd_head]) = '\0'; |
| 1289 | |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 1290 | do_full_getstr: |
| 1291 | #if defined(CONFIG_SMP) |
| 1292 | snprintf(kdb_prompt_str, CMD_BUFLEN, kdbgetenv("PROMPT"), |
| 1293 | raw_smp_processor_id()); |
| 1294 | #else |
| 1295 | snprintf(kdb_prompt_str, CMD_BUFLEN, kdbgetenv("PROMPT")); |
| 1296 | #endif |
| 1297 | if (defcmd_in_progress) |
| 1298 | strncat(kdb_prompt_str, "[defcmd]", CMD_BUFLEN); |
| 1299 | |
| 1300 | /* |
| 1301 | * Fetch command from keyboard |
| 1302 | */ |
| 1303 | cmdbuf = kdb_getstr(cmdbuf, CMD_BUFLEN, kdb_prompt_str); |
| 1304 | if (*cmdbuf != '\n') { |
| 1305 | if (*cmdbuf < 32) { |
| 1306 | if (cmdptr == cmd_head) { |
| 1307 | strncpy(cmd_hist[cmd_head], cmd_cur, |
| 1308 | CMD_BUFLEN); |
| 1309 | *(cmd_hist[cmd_head] + |
| 1310 | strlen(cmd_hist[cmd_head])-1) = '\0'; |
| 1311 | } |
| 1312 | if (!handle_ctrl_cmd(cmdbuf)) |
| 1313 | *(cmd_cur+strlen(cmd_cur)-1) = '\0'; |
| 1314 | cmdbuf = cmd_cur; |
| 1315 | goto do_full_getstr; |
| 1316 | } else { |
| 1317 | strncpy(cmd_hist[cmd_head], cmd_cur, |
| 1318 | CMD_BUFLEN); |
| 1319 | } |
| 1320 | |
| 1321 | cmd_head = (cmd_head+1) % KDB_CMD_HISTORY_COUNT; |
| 1322 | if (cmd_head == cmd_tail) |
| 1323 | cmd_tail = (cmd_tail+1) % KDB_CMD_HISTORY_COUNT; |
| 1324 | } |
| 1325 | |
| 1326 | cmdptr = cmd_head; |
| 1327 | diag = kdb_parse(cmdbuf); |
| 1328 | if (diag == KDB_NOTFOUND) { |
| 1329 | kdb_printf("Unknown kdb command: '%s'\n", cmdbuf); |
| 1330 | diag = 0; |
| 1331 | } |
| 1332 | if (diag == KDB_CMD_GO |
| 1333 | || diag == KDB_CMD_CPU |
| 1334 | || diag == KDB_CMD_SS |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 1335 | || diag == KDB_CMD_KGDB) |
| 1336 | break; |
| 1337 | |
| 1338 | if (diag) |
| 1339 | kdb_cmderror(diag); |
| 1340 | } |
| 1341 | KDB_DEBUG_STATE("kdb_local 9", diag); |
| 1342 | return diag; |
| 1343 | } |
| 1344 | |
| 1345 | |
| 1346 | /* |
| 1347 | * kdb_print_state - Print the state data for the current processor |
| 1348 | * for debugging. |
| 1349 | * Inputs: |
| 1350 | * text Identifies the debug point |
| 1351 | * value Any integer value to be printed, e.g. reason code. |
| 1352 | */ |
| 1353 | void kdb_print_state(const char *text, int value) |
| 1354 | { |
| 1355 | kdb_printf("state: %s cpu %d value %d initial %d state %x\n", |
| 1356 | text, raw_smp_processor_id(), value, kdb_initial_cpu, |
| 1357 | kdb_state); |
| 1358 | } |
| 1359 | |
| 1360 | /* |
| 1361 | * kdb_main_loop - After initial setup and assignment of the |
| 1362 | * controlling cpu, all cpus are in this loop. One cpu is in |
| 1363 | * control and will issue the kdb prompt, the others will spin |
| 1364 | * until 'go' or cpu switch. |
| 1365 | * |
| 1366 | * To get a consistent view of the kernel stacks for all |
| 1367 | * processes, this routine is invoked from the main kdb code via |
| 1368 | * an architecture specific routine. kdba_main_loop is |
| 1369 | * responsible for making the kernel stacks consistent for all |
| 1370 | * processes, there should be no difference between a blocked |
| 1371 | * process and a running process as far as kdb is concerned. |
| 1372 | * Inputs: |
| 1373 | * reason The reason KDB was invoked |
| 1374 | * error The hardware-defined error code |
| 1375 | * reason2 kdb's current reason code. |
| 1376 | * Initially error but can change |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 1377 | * according to kdb state. |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 1378 | * db_result Result code from break or debug point. |
| 1379 | * regs The exception frame at time of fault/breakpoint. |
| 1380 | * should always be valid. |
| 1381 | * Returns: |
| 1382 | * 0 KDB was invoked for an event which it wasn't responsible |
| 1383 | * 1 KDB handled the event for which it was invoked. |
| 1384 | */ |
| 1385 | int kdb_main_loop(kdb_reason_t reason, kdb_reason_t reason2, int error, |
| 1386 | kdb_dbtrap_t db_result, struct pt_regs *regs) |
| 1387 | { |
| 1388 | int result = 1; |
| 1389 | /* Stay in kdb() until 'go', 'ss[b]' or an error */ |
| 1390 | while (1) { |
| 1391 | /* |
| 1392 | * All processors except the one that is in control |
| 1393 | * will spin here. |
| 1394 | */ |
| 1395 | KDB_DEBUG_STATE("kdb_main_loop 1", reason); |
| 1396 | while (KDB_STATE(HOLD_CPU)) { |
| 1397 | /* state KDB is turned off by kdb_cpu to see if the |
| 1398 | * other cpus are still live, each cpu in this loop |
| 1399 | * turns it back on. |
| 1400 | */ |
| 1401 | if (!KDB_STATE(KDB)) |
| 1402 | KDB_STATE_SET(KDB); |
| 1403 | } |
| 1404 | |
| 1405 | KDB_STATE_CLEAR(SUPPRESS); |
| 1406 | KDB_DEBUG_STATE("kdb_main_loop 2", reason); |
| 1407 | if (KDB_STATE(LEAVING)) |
| 1408 | break; /* Another cpu said 'go' */ |
| 1409 | /* Still using kdb, this processor is in control */ |
| 1410 | result = kdb_local(reason2, error, regs, db_result); |
| 1411 | KDB_DEBUG_STATE("kdb_main_loop 3", result); |
| 1412 | |
| 1413 | if (result == KDB_CMD_CPU) |
| 1414 | break; |
| 1415 | |
| 1416 | if (result == KDB_CMD_SS) { |
| 1417 | KDB_STATE_SET(DOING_SS); |
| 1418 | break; |
| 1419 | } |
| 1420 | |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 1421 | if (result == KDB_CMD_KGDB) { |
Jason Wessel | d613d82 | 2011-05-23 13:22:54 -0500 | [diff] [blame] | 1422 | if (!KDB_STATE(DOING_KGDB)) |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 1423 | kdb_printf("Entering please attach debugger " |
| 1424 | "or use $D#44+ or $3#33\n"); |
| 1425 | break; |
| 1426 | } |
| 1427 | if (result && result != 1 && result != KDB_CMD_GO) |
| 1428 | kdb_printf("\nUnexpected kdb_local return code %d\n", |
| 1429 | result); |
| 1430 | KDB_DEBUG_STATE("kdb_main_loop 4", reason); |
| 1431 | break; |
| 1432 | } |
| 1433 | if (KDB_STATE(DOING_SS)) |
| 1434 | KDB_STATE_CLEAR(SSBPT); |
| 1435 | |
Andrei Warkentin | 8f30d41 | 2012-02-28 06:55:05 -0600 | [diff] [blame] | 1436 | /* Clean up any keyboard devices before leaving */ |
| 1437 | kdb_kbd_cleanup_state(); |
| 1438 | |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 1439 | return result; |
| 1440 | } |
| 1441 | |
| 1442 | /* |
| 1443 | * kdb_mdr - This function implements the guts of the 'mdr', memory |
| 1444 | * read command. |
| 1445 | * mdr <addr arg>,<byte count> |
| 1446 | * Inputs: |
| 1447 | * addr Start address |
| 1448 | * count Number of bytes |
| 1449 | * Returns: |
| 1450 | * Always 0. Any errors are detected and printed by kdb_getarea. |
| 1451 | */ |
| 1452 | static int kdb_mdr(unsigned long addr, unsigned int count) |
| 1453 | { |
| 1454 | unsigned char c; |
| 1455 | while (count--) { |
| 1456 | if (kdb_getarea(c, addr)) |
| 1457 | return 0; |
| 1458 | kdb_printf("%02x", c); |
| 1459 | addr++; |
| 1460 | } |
| 1461 | kdb_printf("\n"); |
| 1462 | return 0; |
| 1463 | } |
| 1464 | |
| 1465 | /* |
| 1466 | * kdb_md - This function implements the 'md', 'md1', 'md2', 'md4', |
| 1467 | * 'md8' 'mdr' and 'mds' commands. |
| 1468 | * |
| 1469 | * md|mds [<addr arg> [<line count> [<radix>]]] |
| 1470 | * mdWcN [<addr arg> [<line count> [<radix>]]] |
| 1471 | * where W = is the width (1, 2, 4 or 8) and N is the count. |
| 1472 | * for eg., md1c20 reads 20 bytes, 1 at a time. |
| 1473 | * mdr <addr arg>,<byte count> |
| 1474 | */ |
| 1475 | static void kdb_md_line(const char *fmtstr, unsigned long addr, |
| 1476 | int symbolic, int nosect, int bytesperword, |
| 1477 | int num, int repeat, int phys) |
| 1478 | { |
| 1479 | /* print just one line of data */ |
| 1480 | kdb_symtab_t symtab; |
| 1481 | char cbuf[32]; |
| 1482 | char *c = cbuf; |
| 1483 | int i; |
| 1484 | unsigned long word; |
| 1485 | |
| 1486 | memset(cbuf, '\0', sizeof(cbuf)); |
| 1487 | if (phys) |
| 1488 | kdb_printf("phys " kdb_machreg_fmt0 " ", addr); |
| 1489 | else |
| 1490 | kdb_printf(kdb_machreg_fmt0 " ", addr); |
| 1491 | |
| 1492 | for (i = 0; i < num && repeat--; i++) { |
| 1493 | if (phys) { |
| 1494 | if (kdb_getphysword(&word, addr, bytesperword)) |
| 1495 | break; |
| 1496 | } else if (kdb_getword(&word, addr, bytesperword)) |
| 1497 | break; |
| 1498 | kdb_printf(fmtstr, word); |
| 1499 | if (symbolic) |
| 1500 | kdbnearsym(word, &symtab); |
| 1501 | else |
| 1502 | memset(&symtab, 0, sizeof(symtab)); |
| 1503 | if (symtab.sym_name) { |
| 1504 | kdb_symbol_print(word, &symtab, 0); |
| 1505 | if (!nosect) { |
| 1506 | kdb_printf("\n"); |
| 1507 | kdb_printf(" %s %s " |
| 1508 | kdb_machreg_fmt " " |
| 1509 | kdb_machreg_fmt " " |
| 1510 | kdb_machreg_fmt, symtab.mod_name, |
| 1511 | symtab.sec_name, symtab.sec_start, |
| 1512 | symtab.sym_start, symtab.sym_end); |
| 1513 | } |
| 1514 | addr += bytesperword; |
| 1515 | } else { |
| 1516 | union { |
| 1517 | u64 word; |
| 1518 | unsigned char c[8]; |
| 1519 | } wc; |
| 1520 | unsigned char *cp; |
| 1521 | #ifdef __BIG_ENDIAN |
| 1522 | cp = wc.c + 8 - bytesperword; |
| 1523 | #else |
| 1524 | cp = wc.c; |
| 1525 | #endif |
| 1526 | wc.word = word; |
| 1527 | #define printable_char(c) \ |
| 1528 | ({unsigned char __c = c; isascii(__c) && isprint(__c) ? __c : '.'; }) |
| 1529 | switch (bytesperword) { |
| 1530 | case 8: |
| 1531 | *c++ = printable_char(*cp++); |
| 1532 | *c++ = printable_char(*cp++); |
| 1533 | *c++ = printable_char(*cp++); |
| 1534 | *c++ = printable_char(*cp++); |
| 1535 | addr += 4; |
| 1536 | case 4: |
| 1537 | *c++ = printable_char(*cp++); |
| 1538 | *c++ = printable_char(*cp++); |
| 1539 | addr += 2; |
| 1540 | case 2: |
| 1541 | *c++ = printable_char(*cp++); |
| 1542 | addr++; |
| 1543 | case 1: |
| 1544 | *c++ = printable_char(*cp++); |
| 1545 | addr++; |
| 1546 | break; |
| 1547 | } |
| 1548 | #undef printable_char |
| 1549 | } |
| 1550 | } |
| 1551 | kdb_printf("%*s %s\n", (int)((num-i)*(2*bytesperword + 1)+1), |
| 1552 | " ", cbuf); |
| 1553 | } |
| 1554 | |
| 1555 | static int kdb_md(int argc, const char **argv) |
| 1556 | { |
| 1557 | static unsigned long last_addr; |
| 1558 | static int last_radix, last_bytesperword, last_repeat; |
| 1559 | int radix = 16, mdcount = 8, bytesperword = KDB_WORD_SIZE, repeat; |
| 1560 | int nosect = 0; |
| 1561 | char fmtchar, fmtstr[64]; |
| 1562 | unsigned long addr; |
| 1563 | unsigned long word; |
| 1564 | long offset = 0; |
| 1565 | int symbolic = 0; |
| 1566 | int valid = 0; |
| 1567 | int phys = 0; |
Randy Dunlap | 357cf02 | 2017-12-08 10:19:19 -0800 | [diff] [blame] | 1568 | int raw = 0; |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 1569 | |
| 1570 | kdbgetintenv("MDCOUNT", &mdcount); |
| 1571 | kdbgetintenv("RADIX", &radix); |
| 1572 | kdbgetintenv("BYTESPERWORD", &bytesperword); |
| 1573 | |
| 1574 | /* Assume 'md <addr>' and start with environment values */ |
| 1575 | repeat = mdcount * 16 / bytesperword; |
| 1576 | |
| 1577 | if (strcmp(argv[0], "mdr") == 0) { |
Randy Dunlap | 357cf02 | 2017-12-08 10:19:19 -0800 | [diff] [blame] | 1578 | if (argc == 2 || (argc == 0 && last_addr != 0)) |
| 1579 | valid = raw = 1; |
| 1580 | else |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 1581 | return KDB_ARGCOUNT; |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 1582 | } else if (isdigit(argv[0][2])) { |
| 1583 | bytesperword = (int)(argv[0][2] - '0'); |
| 1584 | if (bytesperword == 0) { |
| 1585 | bytesperword = last_bytesperword; |
| 1586 | if (bytesperword == 0) |
| 1587 | bytesperword = 4; |
| 1588 | } |
| 1589 | last_bytesperword = bytesperword; |
| 1590 | repeat = mdcount * 16 / bytesperword; |
| 1591 | if (!argv[0][3]) |
| 1592 | valid = 1; |
| 1593 | else if (argv[0][3] == 'c' && argv[0][4]) { |
| 1594 | char *p; |
| 1595 | repeat = simple_strtoul(argv[0] + 4, &p, 10); |
| 1596 | mdcount = ((repeat * bytesperword) + 15) / 16; |
| 1597 | valid = !*p; |
| 1598 | } |
| 1599 | last_repeat = repeat; |
| 1600 | } else if (strcmp(argv[0], "md") == 0) |
| 1601 | valid = 1; |
| 1602 | else if (strcmp(argv[0], "mds") == 0) |
| 1603 | valid = 1; |
| 1604 | else if (strcmp(argv[0], "mdp") == 0) { |
| 1605 | phys = valid = 1; |
| 1606 | } |
| 1607 | if (!valid) |
| 1608 | return KDB_NOTFOUND; |
| 1609 | |
| 1610 | if (argc == 0) { |
| 1611 | if (last_addr == 0) |
| 1612 | return KDB_ARGCOUNT; |
| 1613 | addr = last_addr; |
| 1614 | radix = last_radix; |
| 1615 | bytesperword = last_bytesperword; |
| 1616 | repeat = last_repeat; |
Randy Dunlap | 357cf02 | 2017-12-08 10:19:19 -0800 | [diff] [blame] | 1617 | if (raw) |
| 1618 | mdcount = repeat; |
| 1619 | else |
| 1620 | mdcount = ((repeat * bytesperword) + 15) / 16; |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 1621 | } |
| 1622 | |
| 1623 | if (argc) { |
| 1624 | unsigned long val; |
| 1625 | int diag, nextarg = 1; |
| 1626 | diag = kdbgetaddrarg(argc, argv, &nextarg, &addr, |
| 1627 | &offset, NULL); |
| 1628 | if (diag) |
| 1629 | return diag; |
| 1630 | if (argc > nextarg+2) |
| 1631 | return KDB_ARGCOUNT; |
| 1632 | |
| 1633 | if (argc >= nextarg) { |
| 1634 | diag = kdbgetularg(argv[nextarg], &val); |
| 1635 | if (!diag) { |
| 1636 | mdcount = (int) val; |
Randy Dunlap | 357cf02 | 2017-12-08 10:19:19 -0800 | [diff] [blame] | 1637 | if (raw) |
| 1638 | repeat = mdcount; |
| 1639 | else |
| 1640 | repeat = mdcount * 16 / bytesperword; |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 1641 | } |
| 1642 | } |
| 1643 | if (argc >= nextarg+1) { |
| 1644 | diag = kdbgetularg(argv[nextarg+1], &val); |
| 1645 | if (!diag) |
| 1646 | radix = (int) val; |
| 1647 | } |
| 1648 | } |
| 1649 | |
Randy Dunlap | 357cf02 | 2017-12-08 10:19:19 -0800 | [diff] [blame] | 1650 | if (strcmp(argv[0], "mdr") == 0) { |
| 1651 | int ret; |
| 1652 | last_addr = addr; |
| 1653 | ret = kdb_mdr(addr, mdcount); |
| 1654 | last_addr += mdcount; |
| 1655 | last_repeat = mdcount; |
| 1656 | last_bytesperword = bytesperword; // to make REPEAT happy |
| 1657 | return ret; |
| 1658 | } |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 1659 | |
| 1660 | switch (radix) { |
| 1661 | case 10: |
| 1662 | fmtchar = 'd'; |
| 1663 | break; |
| 1664 | case 16: |
| 1665 | fmtchar = 'x'; |
| 1666 | break; |
| 1667 | case 8: |
| 1668 | fmtchar = 'o'; |
| 1669 | break; |
| 1670 | default: |
| 1671 | return KDB_BADRADIX; |
| 1672 | } |
| 1673 | |
| 1674 | last_radix = radix; |
| 1675 | |
| 1676 | if (bytesperword > KDB_WORD_SIZE) |
| 1677 | return KDB_BADWIDTH; |
| 1678 | |
| 1679 | switch (bytesperword) { |
| 1680 | case 8: |
| 1681 | sprintf(fmtstr, "%%16.16l%c ", fmtchar); |
| 1682 | break; |
| 1683 | case 4: |
| 1684 | sprintf(fmtstr, "%%8.8l%c ", fmtchar); |
| 1685 | break; |
| 1686 | case 2: |
| 1687 | sprintf(fmtstr, "%%4.4l%c ", fmtchar); |
| 1688 | break; |
| 1689 | case 1: |
| 1690 | sprintf(fmtstr, "%%2.2l%c ", fmtchar); |
| 1691 | break; |
| 1692 | default: |
| 1693 | return KDB_BADWIDTH; |
| 1694 | } |
| 1695 | |
| 1696 | last_repeat = repeat; |
| 1697 | last_bytesperword = bytesperword; |
| 1698 | |
| 1699 | if (strcmp(argv[0], "mds") == 0) { |
| 1700 | symbolic = 1; |
| 1701 | /* Do not save these changes as last_*, they are temporary mds |
| 1702 | * overrides. |
| 1703 | */ |
| 1704 | bytesperword = KDB_WORD_SIZE; |
| 1705 | repeat = mdcount; |
| 1706 | kdbgetintenv("NOSECT", &nosect); |
| 1707 | } |
| 1708 | |
| 1709 | /* Round address down modulo BYTESPERWORD */ |
| 1710 | |
| 1711 | addr &= ~(bytesperword-1); |
| 1712 | |
| 1713 | while (repeat > 0) { |
| 1714 | unsigned long a; |
| 1715 | int n, z, num = (symbolic ? 1 : (16 / bytesperword)); |
| 1716 | |
| 1717 | if (KDB_FLAG(CMD_INTERRUPT)) |
| 1718 | return 0; |
| 1719 | for (a = addr, z = 0; z < repeat; a += bytesperword, ++z) { |
| 1720 | if (phys) { |
| 1721 | if (kdb_getphysword(&word, a, bytesperword) |
| 1722 | || word) |
| 1723 | break; |
| 1724 | } else if (kdb_getword(&word, a, bytesperword) || word) |
| 1725 | break; |
| 1726 | } |
| 1727 | n = min(num, repeat); |
| 1728 | kdb_md_line(fmtstr, addr, symbolic, nosect, bytesperword, |
| 1729 | num, repeat, phys); |
| 1730 | addr += bytesperword * n; |
| 1731 | repeat -= n; |
| 1732 | z = (z + num - 1) / num; |
| 1733 | if (z > 2) { |
| 1734 | int s = num * (z-2); |
| 1735 | kdb_printf(kdb_machreg_fmt0 "-" kdb_machreg_fmt0 |
| 1736 | " zero suppressed\n", |
| 1737 | addr, addr + bytesperword * s - 1); |
| 1738 | addr += bytesperword * s; |
| 1739 | repeat -= s; |
| 1740 | } |
| 1741 | } |
| 1742 | last_addr = addr; |
| 1743 | |
| 1744 | return 0; |
| 1745 | } |
| 1746 | |
| 1747 | /* |
| 1748 | * kdb_mm - This function implements the 'mm' command. |
| 1749 | * mm address-expression new-value |
| 1750 | * Remarks: |
| 1751 | * mm works on machine words, mmW works on bytes. |
| 1752 | */ |
| 1753 | static int kdb_mm(int argc, const char **argv) |
| 1754 | { |
| 1755 | int diag; |
| 1756 | unsigned long addr; |
| 1757 | long offset = 0; |
| 1758 | unsigned long contents; |
| 1759 | int nextarg; |
| 1760 | int width; |
| 1761 | |
| 1762 | if (argv[0][2] && !isdigit(argv[0][2])) |
| 1763 | return KDB_NOTFOUND; |
| 1764 | |
| 1765 | if (argc < 2) |
| 1766 | return KDB_ARGCOUNT; |
| 1767 | |
| 1768 | nextarg = 1; |
| 1769 | diag = kdbgetaddrarg(argc, argv, &nextarg, &addr, &offset, NULL); |
| 1770 | if (diag) |
| 1771 | return diag; |
| 1772 | |
| 1773 | if (nextarg > argc) |
| 1774 | return KDB_ARGCOUNT; |
| 1775 | diag = kdbgetaddrarg(argc, argv, &nextarg, &contents, NULL, NULL); |
| 1776 | if (diag) |
| 1777 | return diag; |
| 1778 | |
| 1779 | if (nextarg != argc + 1) |
| 1780 | return KDB_ARGCOUNT; |
| 1781 | |
| 1782 | width = argv[0][2] ? (argv[0][2] - '0') : (KDB_WORD_SIZE); |
| 1783 | diag = kdb_putword(addr, contents, width); |
| 1784 | if (diag) |
| 1785 | return diag; |
| 1786 | |
| 1787 | kdb_printf(kdb_machreg_fmt " = " kdb_machreg_fmt "\n", addr, contents); |
| 1788 | |
| 1789 | return 0; |
| 1790 | } |
| 1791 | |
| 1792 | /* |
| 1793 | * kdb_go - This function implements the 'go' command. |
| 1794 | * go [address-expression] |
| 1795 | */ |
| 1796 | static int kdb_go(int argc, const char **argv) |
| 1797 | { |
| 1798 | unsigned long addr; |
| 1799 | int diag; |
| 1800 | int nextarg; |
| 1801 | long offset; |
| 1802 | |
Jason Wessel | 495363d | 2010-05-21 08:46:00 -0500 | [diff] [blame] | 1803 | if (raw_smp_processor_id() != kdb_initial_cpu) { |
| 1804 | kdb_printf("go must execute on the entry cpu, " |
| 1805 | "please use \"cpu %d\" and then execute go\n", |
| 1806 | kdb_initial_cpu); |
| 1807 | return KDB_BADCPUNUM; |
| 1808 | } |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 1809 | if (argc == 1) { |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 1810 | nextarg = 1; |
| 1811 | diag = kdbgetaddrarg(argc, argv, &nextarg, |
| 1812 | &addr, &offset, NULL); |
| 1813 | if (diag) |
| 1814 | return diag; |
| 1815 | } else if (argc) { |
| 1816 | return KDB_ARGCOUNT; |
| 1817 | } |
| 1818 | |
| 1819 | diag = KDB_CMD_GO; |
| 1820 | if (KDB_FLAG(CATASTROPHIC)) { |
| 1821 | kdb_printf("Catastrophic error detected\n"); |
| 1822 | kdb_printf("kdb_continue_catastrophic=%d, ", |
| 1823 | kdb_continue_catastrophic); |
| 1824 | if (kdb_continue_catastrophic == 0 && kdb_go_count++ == 0) { |
| 1825 | kdb_printf("type go a second time if you really want " |
| 1826 | "to continue\n"); |
| 1827 | return 0; |
| 1828 | } |
| 1829 | if (kdb_continue_catastrophic == 2) { |
| 1830 | kdb_printf("forcing reboot\n"); |
| 1831 | kdb_reboot(0, NULL); |
| 1832 | } |
| 1833 | kdb_printf("attempting to continue\n"); |
| 1834 | } |
| 1835 | return diag; |
| 1836 | } |
| 1837 | |
| 1838 | /* |
| 1839 | * kdb_rd - This function implements the 'rd' command. |
| 1840 | */ |
| 1841 | static int kdb_rd(int argc, const char **argv) |
| 1842 | { |
Jason Wessel | 534af10 | 2010-08-05 09:22:20 -0500 | [diff] [blame] | 1843 | int len = kdb_check_regs(); |
| 1844 | #if DBG_MAX_REG_NUM > 0 |
| 1845 | int i; |
| 1846 | char *rname; |
| 1847 | int rsize; |
| 1848 | u64 reg64; |
| 1849 | u32 reg32; |
| 1850 | u16 reg16; |
| 1851 | u8 reg8; |
| 1852 | |
| 1853 | if (len) |
| 1854 | return len; |
| 1855 | |
| 1856 | for (i = 0; i < DBG_MAX_REG_NUM; i++) { |
| 1857 | rsize = dbg_reg_def[i].size * 2; |
| 1858 | if (rsize > 16) |
| 1859 | rsize = 2; |
| 1860 | if (len + strlen(dbg_reg_def[i].name) + 4 + rsize > 80) { |
| 1861 | len = 0; |
| 1862 | kdb_printf("\n"); |
| 1863 | } |
| 1864 | if (len) |
| 1865 | len += kdb_printf(" "); |
| 1866 | switch(dbg_reg_def[i].size * 8) { |
| 1867 | case 8: |
| 1868 | rname = dbg_get_reg(i, ®8, kdb_current_regs); |
| 1869 | if (!rname) |
| 1870 | break; |
| 1871 | len += kdb_printf("%s: %02x", rname, reg8); |
| 1872 | break; |
| 1873 | case 16: |
| 1874 | rname = dbg_get_reg(i, ®16, kdb_current_regs); |
| 1875 | if (!rname) |
| 1876 | break; |
| 1877 | len += kdb_printf("%s: %04x", rname, reg16); |
| 1878 | break; |
| 1879 | case 32: |
| 1880 | rname = dbg_get_reg(i, ®32, kdb_current_regs); |
| 1881 | if (!rname) |
| 1882 | break; |
| 1883 | len += kdb_printf("%s: %08x", rname, reg32); |
| 1884 | break; |
| 1885 | case 64: |
| 1886 | rname = dbg_get_reg(i, ®64, kdb_current_regs); |
| 1887 | if (!rname) |
| 1888 | break; |
| 1889 | len += kdb_printf("%s: %016llx", rname, reg64); |
| 1890 | break; |
| 1891 | default: |
| 1892 | len += kdb_printf("%s: ??", dbg_reg_def[i].name); |
| 1893 | } |
| 1894 | } |
| 1895 | kdb_printf("\n"); |
| 1896 | #else |
| 1897 | if (len) |
| 1898 | return len; |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 1899 | |
| 1900 | kdb_dumpregs(kdb_current_regs); |
Jason Wessel | 534af10 | 2010-08-05 09:22:20 -0500 | [diff] [blame] | 1901 | #endif |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 1902 | return 0; |
| 1903 | } |
| 1904 | |
| 1905 | /* |
| 1906 | * kdb_rm - This function implements the 'rm' (register modify) command. |
| 1907 | * rm register-name new-contents |
| 1908 | * Remarks: |
Jason Wessel | 534af10 | 2010-08-05 09:22:20 -0500 | [diff] [blame] | 1909 | * Allows register modification with the same restrictions as gdb |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 1910 | */ |
| 1911 | static int kdb_rm(int argc, const char **argv) |
| 1912 | { |
Jason Wessel | 534af10 | 2010-08-05 09:22:20 -0500 | [diff] [blame] | 1913 | #if DBG_MAX_REG_NUM > 0 |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 1914 | int diag; |
Jason Wessel | 534af10 | 2010-08-05 09:22:20 -0500 | [diff] [blame] | 1915 | const char *rname; |
| 1916 | int i; |
| 1917 | u64 reg64; |
| 1918 | u32 reg32; |
| 1919 | u16 reg16; |
| 1920 | u8 reg8; |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 1921 | |
| 1922 | if (argc != 2) |
| 1923 | return KDB_ARGCOUNT; |
| 1924 | /* |
| 1925 | * Allow presence or absence of leading '%' symbol. |
| 1926 | */ |
Jason Wessel | 534af10 | 2010-08-05 09:22:20 -0500 | [diff] [blame] | 1927 | rname = argv[1]; |
| 1928 | if (*rname == '%') |
| 1929 | rname++; |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 1930 | |
Jason Wessel | 534af10 | 2010-08-05 09:22:20 -0500 | [diff] [blame] | 1931 | diag = kdbgetu64arg(argv[2], ®64); |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 1932 | if (diag) |
| 1933 | return diag; |
| 1934 | |
| 1935 | diag = kdb_check_regs(); |
| 1936 | if (diag) |
| 1937 | return diag; |
Jason Wessel | 534af10 | 2010-08-05 09:22:20 -0500 | [diff] [blame] | 1938 | |
| 1939 | diag = KDB_BADREG; |
| 1940 | for (i = 0; i < DBG_MAX_REG_NUM; i++) { |
| 1941 | if (strcmp(rname, dbg_reg_def[i].name) == 0) { |
| 1942 | diag = 0; |
| 1943 | break; |
| 1944 | } |
| 1945 | } |
| 1946 | if (!diag) { |
| 1947 | switch(dbg_reg_def[i].size * 8) { |
| 1948 | case 8: |
| 1949 | reg8 = reg64; |
| 1950 | dbg_set_reg(i, ®8, kdb_current_regs); |
| 1951 | break; |
| 1952 | case 16: |
| 1953 | reg16 = reg64; |
| 1954 | dbg_set_reg(i, ®16, kdb_current_regs); |
| 1955 | break; |
| 1956 | case 32: |
| 1957 | reg32 = reg64; |
| 1958 | dbg_set_reg(i, ®32, kdb_current_regs); |
| 1959 | break; |
| 1960 | case 64: |
| 1961 | dbg_set_reg(i, ®64, kdb_current_regs); |
| 1962 | break; |
| 1963 | } |
| 1964 | } |
| 1965 | return diag; |
| 1966 | #else |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 1967 | kdb_printf("ERROR: Register set currently not implemented\n"); |
Jason Wessel | 534af10 | 2010-08-05 09:22:20 -0500 | [diff] [blame] | 1968 | return 0; |
| 1969 | #endif |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 1970 | } |
| 1971 | |
| 1972 | #if defined(CONFIG_MAGIC_SYSRQ) |
| 1973 | /* |
| 1974 | * kdb_sr - This function implements the 'sr' (SYSRQ key) command |
| 1975 | * which interfaces to the soi-disant MAGIC SYSRQ functionality. |
| 1976 | * sr <magic-sysrq-code> |
| 1977 | */ |
| 1978 | static int kdb_sr(int argc, const char **argv) |
| 1979 | { |
Anton Vorontsov | 420c2b1 | 2014-11-06 14:36:46 +0000 | [diff] [blame] | 1980 | bool check_mask = |
| 1981 | !kdb_check_flags(KDB_ENABLE_ALL, kdb_cmd_enabled, false); |
| 1982 | |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 1983 | if (argc != 1) |
| 1984 | return KDB_ARGCOUNT; |
Anton Vorontsov | 420c2b1 | 2014-11-06 14:36:46 +0000 | [diff] [blame] | 1985 | |
Jason Wessel | d37d39a | 2010-05-20 21:04:27 -0500 | [diff] [blame] | 1986 | kdb_trap_printk++; |
Anton Vorontsov | 420c2b1 | 2014-11-06 14:36:46 +0000 | [diff] [blame] | 1987 | __handle_sysrq(*argv[1], check_mask); |
Jason Wessel | d37d39a | 2010-05-20 21:04:27 -0500 | [diff] [blame] | 1988 | kdb_trap_printk--; |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 1989 | |
| 1990 | return 0; |
| 1991 | } |
| 1992 | #endif /* CONFIG_MAGIC_SYSRQ */ |
| 1993 | |
| 1994 | /* |
| 1995 | * kdb_ef - This function implements the 'regs' (display exception |
| 1996 | * frame) command. This command takes an address and expects to |
| 1997 | * find an exception frame at that address, formats and prints |
| 1998 | * it. |
| 1999 | * regs address-expression |
| 2000 | * Remarks: |
| 2001 | * Not done yet. |
| 2002 | */ |
| 2003 | static int kdb_ef(int argc, const char **argv) |
| 2004 | { |
| 2005 | int diag; |
| 2006 | unsigned long addr; |
| 2007 | long offset; |
| 2008 | int nextarg; |
| 2009 | |
| 2010 | if (argc != 1) |
| 2011 | return KDB_ARGCOUNT; |
| 2012 | |
| 2013 | nextarg = 1; |
| 2014 | diag = kdbgetaddrarg(argc, argv, &nextarg, &addr, &offset, NULL); |
| 2015 | if (diag) |
| 2016 | return diag; |
| 2017 | show_regs((struct pt_regs *)addr); |
| 2018 | return 0; |
| 2019 | } |
| 2020 | |
| 2021 | #if defined(CONFIG_MODULES) |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 2022 | /* |
| 2023 | * kdb_lsmod - This function implements the 'lsmod' command. Lists |
| 2024 | * currently loaded kernel modules. |
| 2025 | * Mostly taken from userland lsmod. |
| 2026 | */ |
| 2027 | static int kdb_lsmod(int argc, const char **argv) |
| 2028 | { |
| 2029 | struct module *mod; |
| 2030 | |
| 2031 | if (argc != 0) |
| 2032 | return KDB_ARGCOUNT; |
| 2033 | |
| 2034 | kdb_printf("Module Size modstruct Used by\n"); |
| 2035 | list_for_each_entry(mod, kdb_modules, list) { |
Rusty Russell | 0d21b0e | 2013-01-12 11:38:44 +1030 | [diff] [blame] | 2036 | if (mod->state == MODULE_STATE_UNFORMED) |
| 2037 | continue; |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 2038 | |
| 2039 | kdb_printf("%-20s%8u 0x%p ", mod->name, |
Rusty Russell | 7523e4d | 2015-11-26 09:44:08 +1030 | [diff] [blame] | 2040 | mod->core_layout.size, (void *)mod); |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 2041 | #ifdef CONFIG_MODULE_UNLOAD |
Rusty Russell | d5db139 | 2015-01-22 11:13:14 +1030 | [diff] [blame] | 2042 | kdb_printf("%4d ", module_refcount(mod)); |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 2043 | #endif |
| 2044 | if (mod->state == MODULE_STATE_GOING) |
| 2045 | kdb_printf(" (Unloading)"); |
| 2046 | else if (mod->state == MODULE_STATE_COMING) |
| 2047 | kdb_printf(" (Loading)"); |
| 2048 | else |
| 2049 | kdb_printf(" (Live)"); |
Rusty Russell | 7523e4d | 2015-11-26 09:44:08 +1030 | [diff] [blame] | 2050 | kdb_printf(" 0x%p", mod->core_layout.base); |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 2051 | |
| 2052 | #ifdef CONFIG_MODULE_UNLOAD |
| 2053 | { |
| 2054 | struct module_use *use; |
| 2055 | kdb_printf(" [ "); |
Rusty Russell | c8e21ce | 2010-06-05 11:17:35 -0600 | [diff] [blame] | 2056 | list_for_each_entry(use, &mod->source_list, |
| 2057 | source_list) |
| 2058 | kdb_printf("%s ", use->target->name); |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 2059 | kdb_printf("]\n"); |
| 2060 | } |
| 2061 | #endif |
| 2062 | } |
| 2063 | |
| 2064 | return 0; |
| 2065 | } |
| 2066 | |
| 2067 | #endif /* CONFIG_MODULES */ |
| 2068 | |
| 2069 | /* |
| 2070 | * kdb_env - This function implements the 'env' command. Display the |
| 2071 | * current environment variables. |
| 2072 | */ |
| 2073 | |
| 2074 | static int kdb_env(int argc, const char **argv) |
| 2075 | { |
| 2076 | int i; |
| 2077 | |
| 2078 | for (i = 0; i < __nenv; i++) { |
| 2079 | if (__env[i]) |
| 2080 | kdb_printf("%s\n", __env[i]); |
| 2081 | } |
| 2082 | |
| 2083 | if (KDB_DEBUG(MASK)) |
| 2084 | kdb_printf("KDBFLAGS=0x%x\n", kdb_flags); |
| 2085 | |
| 2086 | return 0; |
| 2087 | } |
| 2088 | |
| 2089 | #ifdef CONFIG_PRINTK |
| 2090 | /* |
| 2091 | * kdb_dmesg - This function implements the 'dmesg' command to display |
| 2092 | * the contents of the syslog buffer. |
| 2093 | * dmesg [lines] [adjust] |
| 2094 | */ |
| 2095 | static int kdb_dmesg(int argc, const char **argv) |
| 2096 | { |
Anton Vorontsov | bc792e6 | 2012-07-20 17:27:37 -0700 | [diff] [blame] | 2097 | int diag; |
| 2098 | int logging; |
| 2099 | int lines = 0; |
| 2100 | int adjust = 0; |
| 2101 | int n = 0; |
| 2102 | int skip = 0; |
| 2103 | struct kmsg_dumper dumper = { .active = 1 }; |
| 2104 | size_t len; |
| 2105 | char buf[201]; |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 2106 | |
| 2107 | if (argc > 2) |
| 2108 | return KDB_ARGCOUNT; |
| 2109 | if (argc) { |
| 2110 | char *cp; |
| 2111 | lines = simple_strtol(argv[1], &cp, 0); |
| 2112 | if (*cp) |
| 2113 | lines = 0; |
| 2114 | if (argc > 1) { |
| 2115 | adjust = simple_strtoul(argv[2], &cp, 0); |
| 2116 | if (*cp || adjust < 0) |
| 2117 | adjust = 0; |
| 2118 | } |
| 2119 | } |
| 2120 | |
| 2121 | /* disable LOGGING if set */ |
| 2122 | diag = kdbgetintenv("LOGGING", &logging); |
| 2123 | if (!diag && logging) { |
| 2124 | const char *setargs[] = { "set", "LOGGING", "0" }; |
| 2125 | kdb_set(2, setargs); |
| 2126 | } |
| 2127 | |
Anton Vorontsov | c064da4 | 2012-07-20 17:28:25 -0700 | [diff] [blame] | 2128 | kmsg_dump_rewind_nolock(&dumper); |
| 2129 | while (kmsg_dump_get_line_nolock(&dumper, 1, NULL, 0, NULL)) |
Anton Vorontsov | bc792e6 | 2012-07-20 17:27:37 -0700 | [diff] [blame] | 2130 | n++; |
| 2131 | |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 2132 | if (lines < 0) { |
| 2133 | if (adjust >= n) |
| 2134 | kdb_printf("buffer only contains %d lines, nothing " |
| 2135 | "printed\n", n); |
| 2136 | else if (adjust - lines >= n) |
| 2137 | kdb_printf("buffer only contains %d lines, last %d " |
| 2138 | "lines printed\n", n, n - adjust); |
Anton Vorontsov | bc792e6 | 2012-07-20 17:27:37 -0700 | [diff] [blame] | 2139 | skip = adjust; |
| 2140 | lines = abs(lines); |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 2141 | } else if (lines > 0) { |
Anton Vorontsov | bc792e6 | 2012-07-20 17:27:37 -0700 | [diff] [blame] | 2142 | skip = n - lines - adjust; |
| 2143 | lines = abs(lines); |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 2144 | if (adjust >= n) { |
| 2145 | kdb_printf("buffer only contains %d lines, " |
| 2146 | "nothing printed\n", n); |
| 2147 | skip = n; |
| 2148 | } else if (skip < 0) { |
| 2149 | lines += skip; |
| 2150 | skip = 0; |
| 2151 | kdb_printf("buffer only contains %d lines, first " |
| 2152 | "%d lines printed\n", n, lines); |
| 2153 | } |
Anton Vorontsov | bc792e6 | 2012-07-20 17:27:37 -0700 | [diff] [blame] | 2154 | } else { |
| 2155 | lines = n; |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 2156 | } |
Anton Vorontsov | bc792e6 | 2012-07-20 17:27:37 -0700 | [diff] [blame] | 2157 | |
| 2158 | if (skip >= n || skip < 0) |
| 2159 | return 0; |
| 2160 | |
Anton Vorontsov | c064da4 | 2012-07-20 17:28:25 -0700 | [diff] [blame] | 2161 | kmsg_dump_rewind_nolock(&dumper); |
| 2162 | while (kmsg_dump_get_line_nolock(&dumper, 1, buf, sizeof(buf), &len)) { |
Anton Vorontsov | bc792e6 | 2012-07-20 17:27:37 -0700 | [diff] [blame] | 2163 | if (skip) { |
| 2164 | skip--; |
| 2165 | continue; |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 2166 | } |
Anton Vorontsov | bc792e6 | 2012-07-20 17:27:37 -0700 | [diff] [blame] | 2167 | if (!lines--) |
| 2168 | break; |
Jason Wessel | d1871b3 | 2012-08-26 21:43:12 -0500 | [diff] [blame] | 2169 | if (KDB_FLAG(CMD_INTERRUPT)) |
| 2170 | return 0; |
Anton Vorontsov | bc792e6 | 2012-07-20 17:27:37 -0700 | [diff] [blame] | 2171 | |
| 2172 | kdb_printf("%.*s\n", (int)len - 1, buf); |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 2173 | } |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 2174 | |
| 2175 | return 0; |
| 2176 | } |
| 2177 | #endif /* CONFIG_PRINTK */ |
Anton Vorontsov | ad394f6 | 2012-09-24 14:27:51 -0700 | [diff] [blame] | 2178 | |
| 2179 | /* Make sure we balance enable/disable calls, must disable first. */ |
| 2180 | static atomic_t kdb_nmi_disabled; |
| 2181 | |
| 2182 | static int kdb_disable_nmi(int argc, const char *argv[]) |
| 2183 | { |
| 2184 | if (atomic_read(&kdb_nmi_disabled)) |
| 2185 | return 0; |
| 2186 | atomic_set(&kdb_nmi_disabled, 1); |
| 2187 | arch_kgdb_ops.enable_nmi(0); |
| 2188 | return 0; |
| 2189 | } |
| 2190 | |
| 2191 | static int kdb_param_enable_nmi(const char *val, const struct kernel_param *kp) |
| 2192 | { |
| 2193 | if (!atomic_add_unless(&kdb_nmi_disabled, -1, 0)) |
| 2194 | return -EINVAL; |
| 2195 | arch_kgdb_ops.enable_nmi(1); |
| 2196 | return 0; |
| 2197 | } |
| 2198 | |
| 2199 | static const struct kernel_param_ops kdb_param_ops_enable_nmi = { |
| 2200 | .set = kdb_param_enable_nmi, |
| 2201 | }; |
| 2202 | module_param_cb(enable_nmi, &kdb_param_ops_enable_nmi, NULL, 0600); |
| 2203 | |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 2204 | /* |
| 2205 | * kdb_cpu - This function implements the 'cpu' command. |
| 2206 | * cpu [<cpunum>] |
| 2207 | * Returns: |
| 2208 | * KDB_CMD_CPU for success, a kdb diagnostic if error |
| 2209 | */ |
| 2210 | static void kdb_cpu_status(void) |
| 2211 | { |
| 2212 | int i, start_cpu, first_print = 1; |
| 2213 | char state, prev_state = '?'; |
| 2214 | |
| 2215 | kdb_printf("Currently on cpu %d\n", raw_smp_processor_id()); |
| 2216 | kdb_printf("Available cpus: "); |
| 2217 | for (start_cpu = -1, i = 0; i < NR_CPUS; i++) { |
| 2218 | if (!cpu_online(i)) { |
| 2219 | state = 'F'; /* cpu is offline */ |
Daniel Thompson | a1465d2 | 2014-11-11 09:31:53 -0600 | [diff] [blame] | 2220 | } else if (!kgdb_info[i].enter_kgdb) { |
| 2221 | state = 'D'; /* cpu is online but unresponsive */ |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 2222 | } else { |
| 2223 | state = ' '; /* cpu is responding to kdb */ |
| 2224 | if (kdb_task_state_char(KDB_TSK(i)) == 'I') |
| 2225 | state = 'I'; /* idle task */ |
| 2226 | } |
| 2227 | if (state != prev_state) { |
| 2228 | if (prev_state != '?') { |
| 2229 | if (!first_print) |
| 2230 | kdb_printf(", "); |
| 2231 | first_print = 0; |
| 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 | prev_state = state; |
| 2239 | start_cpu = i; |
| 2240 | } |
| 2241 | } |
| 2242 | /* print the trailing cpus, ignoring them if they are all offline */ |
| 2243 | if (prev_state != 'F') { |
| 2244 | if (!first_print) |
| 2245 | kdb_printf(", "); |
| 2246 | kdb_printf("%d", start_cpu); |
| 2247 | if (start_cpu < i-1) |
| 2248 | kdb_printf("-%d", i-1); |
| 2249 | if (prev_state != ' ') |
| 2250 | kdb_printf("(%c)", prev_state); |
| 2251 | } |
| 2252 | kdb_printf("\n"); |
| 2253 | } |
| 2254 | |
| 2255 | static int kdb_cpu(int argc, const char **argv) |
| 2256 | { |
| 2257 | unsigned long cpunum; |
| 2258 | int diag; |
| 2259 | |
| 2260 | if (argc == 0) { |
| 2261 | kdb_cpu_status(); |
| 2262 | return 0; |
| 2263 | } |
| 2264 | |
| 2265 | if (argc != 1) |
| 2266 | return KDB_ARGCOUNT; |
| 2267 | |
| 2268 | diag = kdbgetularg(argv[1], &cpunum); |
| 2269 | if (diag) |
| 2270 | return diag; |
| 2271 | |
| 2272 | /* |
| 2273 | * Validate cpunum |
| 2274 | */ |
Jason Wessel | df0036d | 2015-01-08 15:46:55 -0600 | [diff] [blame] | 2275 | if ((cpunum >= CONFIG_NR_CPUS) || !kgdb_info[cpunum].enter_kgdb) |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 2276 | return KDB_BADCPUNUM; |
| 2277 | |
| 2278 | dbg_switch_cpu = cpunum; |
| 2279 | |
| 2280 | /* |
| 2281 | * Switch to other cpu |
| 2282 | */ |
| 2283 | return KDB_CMD_CPU; |
| 2284 | } |
| 2285 | |
| 2286 | /* The user may not realize that ps/bta with no parameters does not print idle |
| 2287 | * or sleeping system daemon processes, so tell them how many were suppressed. |
| 2288 | */ |
| 2289 | void kdb_ps_suppressed(void) |
| 2290 | { |
| 2291 | int idle = 0, daemon = 0; |
| 2292 | unsigned long mask_I = kdb_task_state_string("I"), |
| 2293 | mask_M = kdb_task_state_string("M"); |
| 2294 | unsigned long cpu; |
| 2295 | const struct task_struct *p, *g; |
| 2296 | for_each_online_cpu(cpu) { |
| 2297 | p = kdb_curr_task(cpu); |
| 2298 | if (kdb_task_state(p, mask_I)) |
| 2299 | ++idle; |
| 2300 | } |
| 2301 | kdb_do_each_thread(g, p) { |
| 2302 | if (kdb_task_state(p, mask_M)) |
| 2303 | ++daemon; |
| 2304 | } kdb_while_each_thread(g, p); |
| 2305 | if (idle || daemon) { |
| 2306 | if (idle) |
| 2307 | kdb_printf("%d idle process%s (state I)%s\n", |
| 2308 | idle, idle == 1 ? "" : "es", |
| 2309 | daemon ? " and " : ""); |
| 2310 | if (daemon) |
| 2311 | kdb_printf("%d sleeping system daemon (state M) " |
| 2312 | "process%s", daemon, |
| 2313 | daemon == 1 ? "" : "es"); |
| 2314 | kdb_printf(" suppressed,\nuse 'ps A' to see all.\n"); |
| 2315 | } |
| 2316 | } |
| 2317 | |
| 2318 | /* |
| 2319 | * kdb_ps - This function implements the 'ps' command which shows a |
| 2320 | * list of the active processes. |
| 2321 | * ps [DRSTCZEUIMA] All processes, optionally filtered by state |
| 2322 | */ |
| 2323 | void kdb_ps1(const struct task_struct *p) |
| 2324 | { |
| 2325 | int cpu; |
| 2326 | unsigned long tmp; |
| 2327 | |
| 2328 | if (!p || probe_kernel_read(&tmp, (char *)p, sizeof(unsigned long))) |
| 2329 | return; |
| 2330 | |
| 2331 | cpu = kdb_process_cpu(p); |
| 2332 | kdb_printf("0x%p %8d %8d %d %4d %c 0x%p %c%s\n", |
| 2333 | (void *)p, p->pid, p->parent->pid, |
| 2334 | kdb_task_has_cpu(p), kdb_process_cpu(p), |
| 2335 | kdb_task_state_char(p), |
| 2336 | (void *)(&p->thread), |
| 2337 | p == kdb_curr_task(raw_smp_processor_id()) ? '*' : ' ', |
| 2338 | p->comm); |
| 2339 | if (kdb_task_has_cpu(p)) { |
| 2340 | if (!KDB_TSK(cpu)) { |
| 2341 | kdb_printf(" Error: no saved data for this cpu\n"); |
| 2342 | } else { |
| 2343 | if (KDB_TSK(cpu) != p) |
| 2344 | kdb_printf(" Error: does not match running " |
| 2345 | "process table (0x%p)\n", KDB_TSK(cpu)); |
| 2346 | } |
| 2347 | } |
| 2348 | } |
| 2349 | |
| 2350 | static int kdb_ps(int argc, const char **argv) |
| 2351 | { |
| 2352 | struct task_struct *g, *p; |
| 2353 | unsigned long mask, cpu; |
| 2354 | |
| 2355 | if (argc == 0) |
| 2356 | kdb_ps_suppressed(); |
| 2357 | kdb_printf("%-*s Pid Parent [*] cpu State %-*s Command\n", |
| 2358 | (int)(2*sizeof(void *))+2, "Task Addr", |
| 2359 | (int)(2*sizeof(void *))+2, "Thread"); |
| 2360 | mask = kdb_task_state_string(argc ? argv[1] : NULL); |
| 2361 | /* Run the active tasks first */ |
| 2362 | for_each_online_cpu(cpu) { |
| 2363 | if (KDB_FLAG(CMD_INTERRUPT)) |
| 2364 | return 0; |
| 2365 | p = kdb_curr_task(cpu); |
| 2366 | if (kdb_task_state(p, mask)) |
| 2367 | kdb_ps1(p); |
| 2368 | } |
| 2369 | kdb_printf("\n"); |
| 2370 | /* Now the real tasks */ |
| 2371 | kdb_do_each_thread(g, p) { |
| 2372 | if (KDB_FLAG(CMD_INTERRUPT)) |
| 2373 | return 0; |
| 2374 | if (kdb_task_state(p, mask)) |
| 2375 | kdb_ps1(p); |
| 2376 | } kdb_while_each_thread(g, p); |
| 2377 | |
| 2378 | return 0; |
| 2379 | } |
| 2380 | |
| 2381 | /* |
| 2382 | * kdb_pid - This function implements the 'pid' command which switches |
| 2383 | * the currently active process. |
| 2384 | * pid [<pid> | R] |
| 2385 | */ |
| 2386 | static int kdb_pid(int argc, const char **argv) |
| 2387 | { |
| 2388 | struct task_struct *p; |
| 2389 | unsigned long val; |
| 2390 | int diag; |
| 2391 | |
| 2392 | if (argc > 1) |
| 2393 | return KDB_ARGCOUNT; |
| 2394 | |
| 2395 | if (argc) { |
| 2396 | if (strcmp(argv[1], "R") == 0) { |
| 2397 | p = KDB_TSK(kdb_initial_cpu); |
| 2398 | } else { |
| 2399 | diag = kdbgetularg(argv[1], &val); |
| 2400 | if (diag) |
| 2401 | return KDB_BADINT; |
| 2402 | |
| 2403 | p = find_task_by_pid_ns((pid_t)val, &init_pid_ns); |
| 2404 | if (!p) { |
| 2405 | kdb_printf("No task with pid=%d\n", (pid_t)val); |
| 2406 | return 0; |
| 2407 | } |
| 2408 | } |
| 2409 | kdb_set_current_task(p); |
| 2410 | } |
| 2411 | kdb_printf("KDB current process is %s(pid=%d)\n", |
| 2412 | kdb_current_task->comm, |
| 2413 | kdb_current_task->pid); |
| 2414 | |
| 2415 | return 0; |
| 2416 | } |
| 2417 | |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 2418 | static int kdb_kgdb(int argc, const char **argv) |
| 2419 | { |
| 2420 | return KDB_CMD_KGDB; |
| 2421 | } |
| 2422 | |
| 2423 | /* |
| 2424 | * kdb_help - This function implements the 'help' and '?' commands. |
| 2425 | */ |
| 2426 | static int kdb_help(int argc, const char **argv) |
| 2427 | { |
| 2428 | kdbtab_t *kt; |
| 2429 | int i; |
| 2430 | |
| 2431 | kdb_printf("%-15.15s %-20.20s %s\n", "Command", "Usage", "Description"); |
| 2432 | kdb_printf("-----------------------------" |
| 2433 | "-----------------------------\n"); |
| 2434 | for_each_kdbcmd(kt, i) { |
Jason Wessel | 074604a | 2013-02-04 09:52:14 -0600 | [diff] [blame] | 2435 | char *space = ""; |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 2436 | if (KDB_FLAG(CMD_INTERRUPT)) |
| 2437 | return 0; |
Jason Wessel | 074604a | 2013-02-04 09:52:14 -0600 | [diff] [blame] | 2438 | if (!kt->cmd_name) |
| 2439 | continue; |
Anton Vorontsov | 420c2b1 | 2014-11-06 14:36:46 +0000 | [diff] [blame] | 2440 | if (!kdb_check_flags(kt->cmd_flags, kdb_cmd_enabled, true)) |
| 2441 | continue; |
Jason Wessel | 074604a | 2013-02-04 09:52:14 -0600 | [diff] [blame] | 2442 | if (strlen(kt->cmd_usage) > 20) |
| 2443 | space = "\n "; |
| 2444 | kdb_printf("%-15.15s %-20s%s%s\n", kt->cmd_name, |
| 2445 | kt->cmd_usage, space, kt->cmd_help); |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 2446 | } |
| 2447 | return 0; |
| 2448 | } |
| 2449 | |
| 2450 | /* |
| 2451 | * kdb_kill - This function implements the 'kill' commands. |
| 2452 | */ |
| 2453 | static int kdb_kill(int argc, const char **argv) |
| 2454 | { |
| 2455 | long sig, pid; |
| 2456 | char *endp; |
| 2457 | struct task_struct *p; |
| 2458 | struct siginfo info; |
| 2459 | |
| 2460 | if (argc != 2) |
| 2461 | return KDB_ARGCOUNT; |
| 2462 | |
| 2463 | sig = simple_strtol(argv[1], &endp, 0); |
| 2464 | if (*endp) |
| 2465 | return KDB_BADINT; |
| 2466 | if (sig >= 0) { |
| 2467 | kdb_printf("Invalid signal parameter.<-signal>\n"); |
| 2468 | return 0; |
| 2469 | } |
| 2470 | sig = -sig; |
| 2471 | |
| 2472 | pid = simple_strtol(argv[2], &endp, 0); |
| 2473 | if (*endp) |
| 2474 | return KDB_BADINT; |
| 2475 | if (pid <= 0) { |
| 2476 | kdb_printf("Process ID must be large than 0.\n"); |
| 2477 | return 0; |
| 2478 | } |
| 2479 | |
| 2480 | /* Find the process. */ |
| 2481 | p = find_task_by_pid_ns(pid, &init_pid_ns); |
| 2482 | if (!p) { |
| 2483 | kdb_printf("The specified process isn't found.\n"); |
| 2484 | return 0; |
| 2485 | } |
| 2486 | p = p->group_leader; |
| 2487 | info.si_signo = sig; |
| 2488 | info.si_errno = 0; |
| 2489 | info.si_code = SI_USER; |
| 2490 | info.si_pid = pid; /* same capabilities as process being signalled */ |
| 2491 | info.si_uid = 0; /* kdb has root authority */ |
| 2492 | kdb_send_sig_info(p, &info); |
| 2493 | return 0; |
| 2494 | } |
| 2495 | |
| 2496 | struct kdb_tm { |
| 2497 | int tm_sec; /* seconds */ |
| 2498 | int tm_min; /* minutes */ |
| 2499 | int tm_hour; /* hours */ |
| 2500 | int tm_mday; /* day of the month */ |
| 2501 | int tm_mon; /* month */ |
| 2502 | int tm_year; /* year */ |
| 2503 | }; |
| 2504 | |
| 2505 | static void kdb_gmtime(struct timespec *tv, struct kdb_tm *tm) |
| 2506 | { |
| 2507 | /* This will work from 1970-2099, 2100 is not a leap year */ |
| 2508 | static int mon_day[] = { 31, 29, 31, 30, 31, 30, 31, |
| 2509 | 31, 30, 31, 30, 31 }; |
| 2510 | memset(tm, 0, sizeof(*tm)); |
| 2511 | tm->tm_sec = tv->tv_sec % (24 * 60 * 60); |
| 2512 | tm->tm_mday = tv->tv_sec / (24 * 60 * 60) + |
| 2513 | (2 * 365 + 1); /* shift base from 1970 to 1968 */ |
| 2514 | tm->tm_min = tm->tm_sec / 60 % 60; |
| 2515 | tm->tm_hour = tm->tm_sec / 60 / 60; |
| 2516 | tm->tm_sec = tm->tm_sec % 60; |
| 2517 | tm->tm_year = 68 + 4*(tm->tm_mday / (4*365+1)); |
| 2518 | tm->tm_mday %= (4*365+1); |
| 2519 | mon_day[1] = 29; |
| 2520 | while (tm->tm_mday >= mon_day[tm->tm_mon]) { |
| 2521 | tm->tm_mday -= mon_day[tm->tm_mon]; |
| 2522 | if (++tm->tm_mon == 12) { |
| 2523 | tm->tm_mon = 0; |
| 2524 | ++tm->tm_year; |
| 2525 | mon_day[1] = 28; |
| 2526 | } |
| 2527 | } |
| 2528 | ++tm->tm_mday; |
| 2529 | } |
| 2530 | |
| 2531 | /* |
| 2532 | * Most of this code has been lifted from kernel/timer.c::sys_sysinfo(). |
| 2533 | * I cannot call that code directly from kdb, it has an unconditional |
| 2534 | * cli()/sti() and calls routines that take locks which can stop the debugger. |
| 2535 | */ |
| 2536 | static void kdb_sysinfo(struct sysinfo *val) |
| 2537 | { |
| 2538 | struct timespec uptime; |
Thomas Gleixner | a9821c7 | 2014-06-11 23:59:16 +0000 | [diff] [blame] | 2539 | ktime_get_ts(&uptime); |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 2540 | memset(val, 0, sizeof(*val)); |
| 2541 | val->uptime = uptime.tv_sec; |
| 2542 | val->loads[0] = avenrun[0]; |
| 2543 | val->loads[1] = avenrun[1]; |
| 2544 | val->loads[2] = avenrun[2]; |
| 2545 | val->procs = nr_threads-1; |
| 2546 | si_meminfo(val); |
| 2547 | |
| 2548 | return; |
| 2549 | } |
| 2550 | |
| 2551 | /* |
| 2552 | * kdb_summary - This function implements the 'summary' command. |
| 2553 | */ |
| 2554 | static int kdb_summary(int argc, const char **argv) |
| 2555 | { |
Thomas Gleixner | 157b1a2 | 2010-07-29 10:22:48 +0200 | [diff] [blame] | 2556 | struct timespec now; |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 2557 | struct kdb_tm tm; |
| 2558 | struct sysinfo val; |
| 2559 | |
| 2560 | if (argc) |
| 2561 | return KDB_ARGCOUNT; |
| 2562 | |
| 2563 | kdb_printf("sysname %s\n", init_uts_ns.name.sysname); |
| 2564 | kdb_printf("release %s\n", init_uts_ns.name.release); |
| 2565 | kdb_printf("version %s\n", init_uts_ns.name.version); |
| 2566 | kdb_printf("machine %s\n", init_uts_ns.name.machine); |
| 2567 | kdb_printf("nodename %s\n", init_uts_ns.name.nodename); |
| 2568 | kdb_printf("domainname %s\n", init_uts_ns.name.domainname); |
| 2569 | kdb_printf("ccversion %s\n", __stringify(CCVERSION)); |
| 2570 | |
Thomas Gleixner | 157b1a2 | 2010-07-29 10:22:48 +0200 | [diff] [blame] | 2571 | now = __current_kernel_time(); |
| 2572 | kdb_gmtime(&now, &tm); |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 2573 | kdb_printf("date %04d-%02d-%02d %02d:%02d:%02d " |
| 2574 | "tz_minuteswest %d\n", |
| 2575 | 1900+tm.tm_year, tm.tm_mon+1, tm.tm_mday, |
| 2576 | tm.tm_hour, tm.tm_min, tm.tm_sec, |
| 2577 | sys_tz.tz_minuteswest); |
| 2578 | |
| 2579 | kdb_sysinfo(&val); |
| 2580 | kdb_printf("uptime "); |
| 2581 | if (val.uptime > (24*60*60)) { |
| 2582 | int days = val.uptime / (24*60*60); |
| 2583 | val.uptime %= (24*60*60); |
| 2584 | kdb_printf("%d day%s ", days, days == 1 ? "" : "s"); |
| 2585 | } |
| 2586 | kdb_printf("%02ld:%02ld\n", val.uptime/(60*60), (val.uptime/60)%60); |
| 2587 | |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 2588 | kdb_printf("load avg %ld.%02ld %ld.%02ld %ld.%02ld\n", |
| 2589 | LOAD_INT(val.loads[0]), LOAD_FRAC(val.loads[0]), |
| 2590 | LOAD_INT(val.loads[1]), LOAD_FRAC(val.loads[1]), |
| 2591 | LOAD_INT(val.loads[2]), LOAD_FRAC(val.loads[2])); |
Johannes Weiner | f1675aa | 2018-10-26 15:06:11 -0700 | [diff] [blame] | 2592 | |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 2593 | /* Display in kilobytes */ |
| 2594 | #define K(x) ((x) << (PAGE_SHIFT - 10)) |
| 2595 | kdb_printf("\nMemTotal: %8lu kB\nMemFree: %8lu kB\n" |
| 2596 | "Buffers: %8lu kB\n", |
Jay Lan | 1467559 | 2014-09-29 15:36:57 -0700 | [diff] [blame] | 2597 | K(val.totalram), K(val.freeram), K(val.bufferram)); |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 2598 | return 0; |
| 2599 | } |
| 2600 | |
| 2601 | /* |
| 2602 | * kdb_per_cpu - This function implements the 'per_cpu' command. |
| 2603 | */ |
| 2604 | static int kdb_per_cpu(int argc, const char **argv) |
| 2605 | { |
Jason Wessel | 931ea24 | 2010-10-29 08:04:16 -0500 | [diff] [blame] | 2606 | char fmtstr[64]; |
| 2607 | int cpu, diag, nextarg = 1; |
| 2608 | unsigned long addr, symaddr, val, bytesperword = 0, whichcpu = ~0UL; |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 2609 | |
| 2610 | if (argc < 1 || argc > 3) |
| 2611 | return KDB_ARGCOUNT; |
| 2612 | |
Jason Wessel | 931ea24 | 2010-10-29 08:04:16 -0500 | [diff] [blame] | 2613 | diag = kdbgetaddrarg(argc, argv, &nextarg, &symaddr, NULL, NULL); |
| 2614 | if (diag) |
| 2615 | return diag; |
| 2616 | |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 2617 | if (argc >= 2) { |
| 2618 | diag = kdbgetularg(argv[2], &bytesperword); |
| 2619 | if (diag) |
| 2620 | return diag; |
| 2621 | } |
| 2622 | if (!bytesperword) |
| 2623 | bytesperword = KDB_WORD_SIZE; |
| 2624 | else if (bytesperword > KDB_WORD_SIZE) |
| 2625 | return KDB_BADWIDTH; |
| 2626 | sprintf(fmtstr, "%%0%dlx ", (int)(2*bytesperword)); |
| 2627 | if (argc >= 3) { |
| 2628 | diag = kdbgetularg(argv[3], &whichcpu); |
| 2629 | if (diag) |
| 2630 | return diag; |
| 2631 | if (!cpu_online(whichcpu)) { |
| 2632 | kdb_printf("cpu %ld is not online\n", whichcpu); |
| 2633 | return KDB_BADCPUNUM; |
| 2634 | } |
| 2635 | } |
| 2636 | |
| 2637 | /* Most architectures use __per_cpu_offset[cpu], some use |
| 2638 | * __per_cpu_offset(cpu), smp has no __per_cpu_offset. |
| 2639 | */ |
| 2640 | #ifdef __per_cpu_offset |
| 2641 | #define KDB_PCU(cpu) __per_cpu_offset(cpu) |
| 2642 | #else |
| 2643 | #ifdef CONFIG_SMP |
| 2644 | #define KDB_PCU(cpu) __per_cpu_offset[cpu] |
| 2645 | #else |
| 2646 | #define KDB_PCU(cpu) 0 |
| 2647 | #endif |
| 2648 | #endif |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 2649 | for_each_online_cpu(cpu) { |
Jason Wessel | 931ea24 | 2010-10-29 08:04:16 -0500 | [diff] [blame] | 2650 | if (KDB_FLAG(CMD_INTERRUPT)) |
| 2651 | return 0; |
| 2652 | |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 2653 | if (whichcpu != ~0UL && whichcpu != cpu) |
| 2654 | continue; |
Jason Wessel | 931ea24 | 2010-10-29 08:04:16 -0500 | [diff] [blame] | 2655 | addr = symaddr + KDB_PCU(cpu); |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 2656 | diag = kdb_getword(&val, addr, bytesperword); |
| 2657 | if (diag) { |
| 2658 | kdb_printf("%5d " kdb_bfd_vma_fmt0 " - unable to " |
| 2659 | "read, diag=%d\n", cpu, addr, diag); |
| 2660 | continue; |
| 2661 | } |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 2662 | kdb_printf("%5d ", cpu); |
| 2663 | kdb_md_line(fmtstr, addr, |
| 2664 | bytesperword == KDB_WORD_SIZE, |
| 2665 | 1, bytesperword, 1, 1, 0); |
| 2666 | } |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 2667 | #undef KDB_PCU |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 2668 | return 0; |
| 2669 | } |
| 2670 | |
| 2671 | /* |
| 2672 | * display help for the use of cmd | grep pattern |
| 2673 | */ |
| 2674 | static int kdb_grep_help(int argc, const char **argv) |
| 2675 | { |
| 2676 | kdb_printf("Usage of cmd args | grep pattern:\n"); |
| 2677 | kdb_printf(" Any command's output may be filtered through an "); |
| 2678 | kdb_printf("emulated 'pipe'.\n"); |
| 2679 | kdb_printf(" 'grep' is just a key word.\n"); |
| 2680 | kdb_printf(" The pattern may include a very limited set of " |
| 2681 | "metacharacters:\n"); |
| 2682 | kdb_printf(" pattern or ^pattern or pattern$ or ^pattern$\n"); |
| 2683 | kdb_printf(" And if there are spaces in the pattern, you may " |
| 2684 | "quote it:\n"); |
| 2685 | kdb_printf(" \"pat tern\" or \"^pat tern\" or \"pat tern$\"" |
| 2686 | " or \"^pat tern$\"\n"); |
| 2687 | return 0; |
| 2688 | } |
| 2689 | |
| 2690 | /* |
Anton Vorontsov | 42c884c | 2014-11-06 14:36:42 +0000 | [diff] [blame] | 2691 | * kdb_register_flags - This function is used to register a kernel |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 2692 | * debugger command. |
| 2693 | * Inputs: |
| 2694 | * cmd Command name |
| 2695 | * func Function to execute the command |
| 2696 | * usage A simple usage string showing arguments |
| 2697 | * help A simple help string describing command |
| 2698 | * repeat Does the command auto repeat on enter? |
| 2699 | * Returns: |
| 2700 | * zero for success, one if a duplicate command. |
| 2701 | */ |
| 2702 | #define kdb_command_extend 50 /* arbitrary */ |
Anton Vorontsov | 42c884c | 2014-11-06 14:36:42 +0000 | [diff] [blame] | 2703 | int kdb_register_flags(char *cmd, |
| 2704 | kdb_func_t func, |
| 2705 | char *usage, |
| 2706 | char *help, |
| 2707 | short minlen, |
| 2708 | kdb_cmdflags_t flags) |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 2709 | { |
| 2710 | int i; |
| 2711 | kdbtab_t *kp; |
| 2712 | |
| 2713 | /* |
| 2714 | * Brute force method to determine duplicates |
| 2715 | */ |
| 2716 | for_each_kdbcmd(kp, i) { |
| 2717 | if (kp->cmd_name && (strcmp(kp->cmd_name, cmd) == 0)) { |
| 2718 | kdb_printf("Duplicate kdb command registered: " |
| 2719 | "%s, func %p help %s\n", cmd, func, help); |
| 2720 | return 1; |
| 2721 | } |
| 2722 | } |
| 2723 | |
| 2724 | /* |
| 2725 | * Insert command into first available location in table |
| 2726 | */ |
| 2727 | for_each_kdbcmd(kp, i) { |
| 2728 | if (kp->cmd_name == NULL) |
| 2729 | break; |
| 2730 | } |
| 2731 | |
| 2732 | if (i >= kdb_max_commands) { |
| 2733 | kdbtab_t *new = kmalloc((kdb_max_commands - KDB_BASE_CMD_MAX + |
| 2734 | kdb_command_extend) * sizeof(*new), GFP_KDB); |
| 2735 | if (!new) { |
| 2736 | kdb_printf("Could not allocate new kdb_command " |
| 2737 | "table\n"); |
| 2738 | return 1; |
| 2739 | } |
| 2740 | if (kdb_commands) { |
| 2741 | memcpy(new, kdb_commands, |
Jovi Zhang | 5450d90 | 2010-11-10 07:22:18 -0600 | [diff] [blame] | 2742 | (kdb_max_commands - KDB_BASE_CMD_MAX) * sizeof(*new)); |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 2743 | kfree(kdb_commands); |
| 2744 | } |
John Blackwood | f7c82d5 | 2012-12-10 15:37:22 -0600 | [diff] [blame] | 2745 | memset(new + kdb_max_commands - KDB_BASE_CMD_MAX, 0, |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 2746 | kdb_command_extend * sizeof(*new)); |
| 2747 | kdb_commands = new; |
Jovi Zhang | 5450d90 | 2010-11-10 07:22:18 -0600 | [diff] [blame] | 2748 | kp = kdb_commands + kdb_max_commands - KDB_BASE_CMD_MAX; |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 2749 | kdb_max_commands += kdb_command_extend; |
| 2750 | } |
| 2751 | |
| 2752 | kp->cmd_name = cmd; |
| 2753 | kp->cmd_func = func; |
| 2754 | kp->cmd_usage = usage; |
| 2755 | kp->cmd_help = help; |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 2756 | kp->cmd_minlen = minlen; |
Anton Vorontsov | 15a42a9 | 2014-11-06 14:36:41 +0000 | [diff] [blame] | 2757 | kp->cmd_flags = flags; |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 2758 | |
| 2759 | return 0; |
| 2760 | } |
Anton Vorontsov | 42c884c | 2014-11-06 14:36:42 +0000 | [diff] [blame] | 2761 | EXPORT_SYMBOL_GPL(kdb_register_flags); |
Jason Wessel | f7030bb | 2010-10-11 10:20:14 -0500 | [diff] [blame] | 2762 | |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 2763 | |
| 2764 | /* |
| 2765 | * kdb_register - Compatibility register function for commands that do |
| 2766 | * not need to specify a repeat state. Equivalent to |
Anton Vorontsov | e8ab24d | 2014-11-06 14:36:44 +0000 | [diff] [blame] | 2767 | * kdb_register_flags with flags set to 0. |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 2768 | * Inputs: |
| 2769 | * cmd Command name |
| 2770 | * func Function to execute the command |
| 2771 | * usage A simple usage string showing arguments |
| 2772 | * help A simple help string describing command |
| 2773 | * Returns: |
| 2774 | * zero for success, one if a duplicate command. |
| 2775 | */ |
| 2776 | int kdb_register(char *cmd, |
| 2777 | kdb_func_t func, |
| 2778 | char *usage, |
| 2779 | char *help, |
| 2780 | short minlen) |
| 2781 | { |
Anton Vorontsov | e8ab24d | 2014-11-06 14:36:44 +0000 | [diff] [blame] | 2782 | return kdb_register_flags(cmd, func, usage, help, minlen, 0); |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 2783 | } |
Jason Wessel | f7030bb | 2010-10-11 10:20:14 -0500 | [diff] [blame] | 2784 | EXPORT_SYMBOL_GPL(kdb_register); |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 2785 | |
| 2786 | /* |
| 2787 | * kdb_unregister - This function is used to unregister a kernel |
| 2788 | * debugger command. It is generally called when a module which |
| 2789 | * implements kdb commands is unloaded. |
| 2790 | * Inputs: |
| 2791 | * cmd Command name |
| 2792 | * Returns: |
| 2793 | * zero for success, one command not registered. |
| 2794 | */ |
| 2795 | int kdb_unregister(char *cmd) |
| 2796 | { |
| 2797 | int i; |
| 2798 | kdbtab_t *kp; |
| 2799 | |
| 2800 | /* |
| 2801 | * find the command. |
| 2802 | */ |
Jason Wessel | 75d14ed | 2010-10-11 10:20:14 -0500 | [diff] [blame] | 2803 | for_each_kdbcmd(kp, i) { |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 2804 | if (kp->cmd_name && (strcmp(kp->cmd_name, cmd) == 0)) { |
| 2805 | kp->cmd_name = NULL; |
| 2806 | return 0; |
| 2807 | } |
| 2808 | } |
| 2809 | |
| 2810 | /* Couldn't find it. */ |
| 2811 | return 1; |
| 2812 | } |
Jason Wessel | f7030bb | 2010-10-11 10:20:14 -0500 | [diff] [blame] | 2813 | EXPORT_SYMBOL_GPL(kdb_unregister); |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 2814 | |
| 2815 | /* Initialize the kdb command table. */ |
| 2816 | static void __init kdb_inittab(void) |
| 2817 | { |
| 2818 | int i; |
| 2819 | kdbtab_t *kp; |
| 2820 | |
| 2821 | for_each_kdbcmd(kp, i) |
| 2822 | kp->cmd_name = NULL; |
| 2823 | |
Anton Vorontsov | 42c884c | 2014-11-06 14:36:42 +0000 | [diff] [blame] | 2824 | kdb_register_flags("md", kdb_md, "<vaddr>", |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 2825 | "Display Memory Contents, also mdWcN, e.g. md8c1", 1, |
Daniel Thompson | 9452e97 | 2014-11-06 14:36:45 +0000 | [diff] [blame] | 2826 | KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS); |
Anton Vorontsov | 42c884c | 2014-11-06 14:36:42 +0000 | [diff] [blame] | 2827 | kdb_register_flags("mdr", kdb_md, "<vaddr> <bytes>", |
Daniel Thompson | 9452e97 | 2014-11-06 14:36:45 +0000 | [diff] [blame] | 2828 | "Display Raw Memory", 0, |
| 2829 | KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS); |
Anton Vorontsov | 42c884c | 2014-11-06 14:36:42 +0000 | [diff] [blame] | 2830 | kdb_register_flags("mdp", kdb_md, "<paddr> <bytes>", |
Daniel Thompson | 9452e97 | 2014-11-06 14:36:45 +0000 | [diff] [blame] | 2831 | "Display Physical Memory", 0, |
| 2832 | KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS); |
Anton Vorontsov | 42c884c | 2014-11-06 14:36:42 +0000 | [diff] [blame] | 2833 | kdb_register_flags("mds", kdb_md, "<vaddr>", |
Daniel Thompson | 9452e97 | 2014-11-06 14:36:45 +0000 | [diff] [blame] | 2834 | "Display Memory Symbolically", 0, |
| 2835 | KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS); |
Anton Vorontsov | 42c884c | 2014-11-06 14:36:42 +0000 | [diff] [blame] | 2836 | kdb_register_flags("mm", kdb_mm, "<vaddr> <contents>", |
Daniel Thompson | 9452e97 | 2014-11-06 14:36:45 +0000 | [diff] [blame] | 2837 | "Modify Memory Contents", 0, |
| 2838 | KDB_ENABLE_MEM_WRITE | KDB_REPEAT_NO_ARGS); |
Anton Vorontsov | 42c884c | 2014-11-06 14:36:42 +0000 | [diff] [blame] | 2839 | kdb_register_flags("go", kdb_go, "[<vaddr>]", |
Daniel Thompson | 9452e97 | 2014-11-06 14:36:45 +0000 | [diff] [blame] | 2840 | "Continue Execution", 1, |
| 2841 | KDB_ENABLE_REG_WRITE | KDB_ENABLE_ALWAYS_SAFE_NO_ARGS); |
Anton Vorontsov | 42c884c | 2014-11-06 14:36:42 +0000 | [diff] [blame] | 2842 | kdb_register_flags("rd", kdb_rd, "", |
Daniel Thompson | 9452e97 | 2014-11-06 14:36:45 +0000 | [diff] [blame] | 2843 | "Display Registers", 0, |
| 2844 | KDB_ENABLE_REG_READ); |
Anton Vorontsov | 42c884c | 2014-11-06 14:36:42 +0000 | [diff] [blame] | 2845 | kdb_register_flags("rm", kdb_rm, "<reg> <contents>", |
Daniel Thompson | 9452e97 | 2014-11-06 14:36:45 +0000 | [diff] [blame] | 2846 | "Modify Registers", 0, |
| 2847 | KDB_ENABLE_REG_WRITE); |
Anton Vorontsov | 42c884c | 2014-11-06 14:36:42 +0000 | [diff] [blame] | 2848 | kdb_register_flags("ef", kdb_ef, "<vaddr>", |
Daniel Thompson | 9452e97 | 2014-11-06 14:36:45 +0000 | [diff] [blame] | 2849 | "Display exception frame", 0, |
| 2850 | KDB_ENABLE_MEM_READ); |
Anton Vorontsov | 42c884c | 2014-11-06 14:36:42 +0000 | [diff] [blame] | 2851 | kdb_register_flags("bt", kdb_bt, "[<vaddr>]", |
Daniel Thompson | 9452e97 | 2014-11-06 14:36:45 +0000 | [diff] [blame] | 2852 | "Stack traceback", 1, |
| 2853 | KDB_ENABLE_MEM_READ | KDB_ENABLE_INSPECT_NO_ARGS); |
Anton Vorontsov | 42c884c | 2014-11-06 14:36:42 +0000 | [diff] [blame] | 2854 | kdb_register_flags("btp", kdb_bt, "<pid>", |
Daniel Thompson | 9452e97 | 2014-11-06 14:36:45 +0000 | [diff] [blame] | 2855 | "Display stack for process <pid>", 0, |
| 2856 | KDB_ENABLE_INSPECT); |
Anton Vorontsov | 42c884c | 2014-11-06 14:36:42 +0000 | [diff] [blame] | 2857 | kdb_register_flags("bta", kdb_bt, "[D|R|S|T|C|Z|E|U|I|M|A]", |
Daniel Thompson | 9452e97 | 2014-11-06 14:36:45 +0000 | [diff] [blame] | 2858 | "Backtrace all processes matching state flag", 0, |
| 2859 | KDB_ENABLE_INSPECT); |
Anton Vorontsov | 42c884c | 2014-11-06 14:36:42 +0000 | [diff] [blame] | 2860 | kdb_register_flags("btc", kdb_bt, "", |
Daniel Thompson | 9452e97 | 2014-11-06 14:36:45 +0000 | [diff] [blame] | 2861 | "Backtrace current process on each cpu", 0, |
| 2862 | KDB_ENABLE_INSPECT); |
Anton Vorontsov | 42c884c | 2014-11-06 14:36:42 +0000 | [diff] [blame] | 2863 | kdb_register_flags("btt", kdb_bt, "<vaddr>", |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 2864 | "Backtrace process given its struct task address", 0, |
Daniel Thompson | 9452e97 | 2014-11-06 14:36:45 +0000 | [diff] [blame] | 2865 | KDB_ENABLE_MEM_READ | KDB_ENABLE_INSPECT_NO_ARGS); |
Anton Vorontsov | 42c884c | 2014-11-06 14:36:42 +0000 | [diff] [blame] | 2866 | kdb_register_flags("env", kdb_env, "", |
Daniel Thompson | 9452e97 | 2014-11-06 14:36:45 +0000 | [diff] [blame] | 2867 | "Show environment variables", 0, |
| 2868 | KDB_ENABLE_ALWAYS_SAFE); |
Anton Vorontsov | 42c884c | 2014-11-06 14:36:42 +0000 | [diff] [blame] | 2869 | kdb_register_flags("set", kdb_set, "", |
Daniel Thompson | 9452e97 | 2014-11-06 14:36:45 +0000 | [diff] [blame] | 2870 | "Set environment variables", 0, |
| 2871 | KDB_ENABLE_ALWAYS_SAFE); |
Anton Vorontsov | 42c884c | 2014-11-06 14:36:42 +0000 | [diff] [blame] | 2872 | kdb_register_flags("help", kdb_help, "", |
Daniel Thompson | 9452e97 | 2014-11-06 14:36:45 +0000 | [diff] [blame] | 2873 | "Display Help Message", 1, |
| 2874 | KDB_ENABLE_ALWAYS_SAFE); |
Anton Vorontsov | 42c884c | 2014-11-06 14:36:42 +0000 | [diff] [blame] | 2875 | kdb_register_flags("?", kdb_help, "", |
Daniel Thompson | 9452e97 | 2014-11-06 14:36:45 +0000 | [diff] [blame] | 2876 | "Display Help Message", 0, |
| 2877 | KDB_ENABLE_ALWAYS_SAFE); |
Anton Vorontsov | 42c884c | 2014-11-06 14:36:42 +0000 | [diff] [blame] | 2878 | kdb_register_flags("cpu", kdb_cpu, "<cpunum>", |
Daniel Thompson | 9452e97 | 2014-11-06 14:36:45 +0000 | [diff] [blame] | 2879 | "Switch to new cpu", 0, |
| 2880 | KDB_ENABLE_ALWAYS_SAFE_NO_ARGS); |
Anton Vorontsov | 42c884c | 2014-11-06 14:36:42 +0000 | [diff] [blame] | 2881 | kdb_register_flags("kgdb", kdb_kgdb, "", |
Anton Vorontsov | e8ab24d | 2014-11-06 14:36:44 +0000 | [diff] [blame] | 2882 | "Enter kgdb mode", 0, 0); |
Anton Vorontsov | 42c884c | 2014-11-06 14:36:42 +0000 | [diff] [blame] | 2883 | kdb_register_flags("ps", kdb_ps, "[<flags>|A]", |
Daniel Thompson | 9452e97 | 2014-11-06 14:36:45 +0000 | [diff] [blame] | 2884 | "Display active task list", 0, |
| 2885 | KDB_ENABLE_INSPECT); |
Anton Vorontsov | 42c884c | 2014-11-06 14:36:42 +0000 | [diff] [blame] | 2886 | kdb_register_flags("pid", kdb_pid, "<pidnum>", |
Daniel Thompson | 9452e97 | 2014-11-06 14:36:45 +0000 | [diff] [blame] | 2887 | "Switch to another task", 0, |
| 2888 | KDB_ENABLE_INSPECT); |
Anton Vorontsov | 42c884c | 2014-11-06 14:36:42 +0000 | [diff] [blame] | 2889 | kdb_register_flags("reboot", kdb_reboot, "", |
Daniel Thompson | 9452e97 | 2014-11-06 14:36:45 +0000 | [diff] [blame] | 2890 | "Reboot the machine immediately", 0, |
| 2891 | KDB_ENABLE_REBOOT); |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 2892 | #if defined(CONFIG_MODULES) |
Anton Vorontsov | 42c884c | 2014-11-06 14:36:42 +0000 | [diff] [blame] | 2893 | kdb_register_flags("lsmod", kdb_lsmod, "", |
Daniel Thompson | 9452e97 | 2014-11-06 14:36:45 +0000 | [diff] [blame] | 2894 | "List loaded kernel modules", 0, |
| 2895 | KDB_ENABLE_INSPECT); |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 2896 | #endif |
| 2897 | #if defined(CONFIG_MAGIC_SYSRQ) |
Anton Vorontsov | 42c884c | 2014-11-06 14:36:42 +0000 | [diff] [blame] | 2898 | kdb_register_flags("sr", kdb_sr, "<key>", |
Daniel Thompson | 9452e97 | 2014-11-06 14:36:45 +0000 | [diff] [blame] | 2899 | "Magic SysRq key", 0, |
| 2900 | KDB_ENABLE_ALWAYS_SAFE); |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 2901 | #endif |
| 2902 | #if defined(CONFIG_PRINTK) |
Anton Vorontsov | 42c884c | 2014-11-06 14:36:42 +0000 | [diff] [blame] | 2903 | kdb_register_flags("dmesg", kdb_dmesg, "[lines]", |
Daniel Thompson | 9452e97 | 2014-11-06 14:36:45 +0000 | [diff] [blame] | 2904 | "Display syslog buffer", 0, |
| 2905 | KDB_ENABLE_ALWAYS_SAFE); |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 2906 | #endif |
Anton Vorontsov | ad394f6 | 2012-09-24 14:27:51 -0700 | [diff] [blame] | 2907 | if (arch_kgdb_ops.enable_nmi) { |
Anton Vorontsov | 42c884c | 2014-11-06 14:36:42 +0000 | [diff] [blame] | 2908 | kdb_register_flags("disable_nmi", kdb_disable_nmi, "", |
Daniel Thompson | 9452e97 | 2014-11-06 14:36:45 +0000 | [diff] [blame] | 2909 | "Disable NMI entry to KDB", 0, |
| 2910 | KDB_ENABLE_ALWAYS_SAFE); |
Anton Vorontsov | ad394f6 | 2012-09-24 14:27:51 -0700 | [diff] [blame] | 2911 | } |
Anton Vorontsov | 42c884c | 2014-11-06 14:36:42 +0000 | [diff] [blame] | 2912 | kdb_register_flags("defcmd", kdb_defcmd, "name \"usage\" \"help\"", |
Daniel Thompson | 9452e97 | 2014-11-06 14:36:45 +0000 | [diff] [blame] | 2913 | "Define a set of commands, down to endefcmd", 0, |
| 2914 | KDB_ENABLE_ALWAYS_SAFE); |
Anton Vorontsov | 42c884c | 2014-11-06 14:36:42 +0000 | [diff] [blame] | 2915 | kdb_register_flags("kill", kdb_kill, "<-signal> <pid>", |
Daniel Thompson | 9452e97 | 2014-11-06 14:36:45 +0000 | [diff] [blame] | 2916 | "Send a signal to a process", 0, |
| 2917 | KDB_ENABLE_SIGNAL); |
Anton Vorontsov | 42c884c | 2014-11-06 14:36:42 +0000 | [diff] [blame] | 2918 | kdb_register_flags("summary", kdb_summary, "", |
Daniel Thompson | 9452e97 | 2014-11-06 14:36:45 +0000 | [diff] [blame] | 2919 | "Summarize the system", 4, |
| 2920 | KDB_ENABLE_ALWAYS_SAFE); |
Anton Vorontsov | 42c884c | 2014-11-06 14:36:42 +0000 | [diff] [blame] | 2921 | kdb_register_flags("per_cpu", kdb_per_cpu, "<sym> [<bytes>] [<cpu>]", |
Daniel Thompson | 9452e97 | 2014-11-06 14:36:45 +0000 | [diff] [blame] | 2922 | "Display per_cpu variables", 3, |
| 2923 | KDB_ENABLE_MEM_READ); |
Anton Vorontsov | 42c884c | 2014-11-06 14:36:42 +0000 | [diff] [blame] | 2924 | kdb_register_flags("grephelp", kdb_grep_help, "", |
Daniel Thompson | 9452e97 | 2014-11-06 14:36:45 +0000 | [diff] [blame] | 2925 | "Display help on | grep", 0, |
| 2926 | KDB_ENABLE_ALWAYS_SAFE); |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 2927 | } |
| 2928 | |
| 2929 | /* Execute any commands defined in kdb_cmds. */ |
| 2930 | static void __init kdb_cmd_init(void) |
| 2931 | { |
| 2932 | int i, diag; |
| 2933 | for (i = 0; kdb_cmds[i]; ++i) { |
| 2934 | diag = kdb_parse(kdb_cmds[i]); |
| 2935 | if (diag) |
| 2936 | kdb_printf("kdb command %s failed, kdb diag %d\n", |
| 2937 | kdb_cmds[i], diag); |
| 2938 | } |
| 2939 | if (defcmd_in_progress) { |
| 2940 | kdb_printf("Incomplete 'defcmd' set, forcing endefcmd\n"); |
| 2941 | kdb_parse("endefcmd"); |
| 2942 | } |
| 2943 | } |
| 2944 | |
Uwe Kleine-König | b595076 | 2010-11-01 15:38:34 -0400 | [diff] [blame] | 2945 | /* Initialize kdb_printf, breakpoint tables and kdb state */ |
Jason Wessel | 5d5314d | 2010-05-20 21:04:20 -0500 | [diff] [blame] | 2946 | void __init kdb_init(int lvl) |
| 2947 | { |
| 2948 | static int kdb_init_lvl = KDB_NOT_INITIALIZED; |
| 2949 | int i; |
| 2950 | |
| 2951 | if (kdb_init_lvl == KDB_INIT_FULL || lvl <= kdb_init_lvl) |
| 2952 | return; |
| 2953 | for (i = kdb_init_lvl; i < lvl; i++) { |
| 2954 | switch (i) { |
| 2955 | case KDB_NOT_INITIALIZED: |
| 2956 | kdb_inittab(); /* Initialize Command Table */ |
| 2957 | kdb_initbptab(); /* Initialize Breakpoints */ |
| 2958 | break; |
| 2959 | case KDB_INIT_EARLY: |
| 2960 | kdb_cmd_init(); /* Build kdb_cmds tables */ |
| 2961 | break; |
| 2962 | } |
| 2963 | } |
| 2964 | kdb_init_lvl = lvl; |
| 2965 | } |