| /* |
| * Kernel Debugger Architecture Independent Main Code |
| * |
| * This file is subject to the terms and conditions of the GNU General Public |
| * License. See the file "COPYING" in the main directory of this archive |
| * for more details. |
| * |
| * Copyright (C) 1999-2004 Silicon Graphics, Inc. All Rights Reserved. |
| * Copyright (C) 2000 Stephane Eranian <eranian@hpl.hp.com> |
| * Xscale (R) modifications copyright (C) 2003 Intel Corporation. |
| * Copyright (c) 2009 Wind River Systems, Inc. All Rights Reserved. |
| */ |
| |
| #include <linux/ctype.h> |
| #include <linux/string.h> |
| #include <linux/kernel.h> |
| #include <linux/reboot.h> |
| #include <linux/sched.h> |
| #include <linux/sysrq.h> |
| #include <linux/smp.h> |
| #include <linux/utsname.h> |
| #include <linux/vmalloc.h> |
| #include <linux/module.h> |
| #include <linux/mm.h> |
| #include <linux/init.h> |
| #include <linux/kallsyms.h> |
| #include <linux/kgdb.h> |
| #include <linux/kdb.h> |
| #include <linux/notifier.h> |
| #include <linux/interrupt.h> |
| #include <linux/delay.h> |
| #include <linux/nmi.h> |
| #include <linux/time.h> |
| #include <linux/ptrace.h> |
| #include <linux/sysctl.h> |
| #include <linux/cpu.h> |
| #include <linux/kdebug.h> |
| #include <linux/proc_fs.h> |
| #include <linux/uaccess.h> |
| #include <linux/slab.h> |
| #include "kdb_private.h" |
| |
| #define GREP_LEN 256 |
| char kdb_grep_string[GREP_LEN]; |
| int kdb_grepping_flag; |
| EXPORT_SYMBOL(kdb_grepping_flag); |
| int kdb_grep_leading; |
| int kdb_grep_trailing; |
| |
| /* |
| * Kernel debugger state flags |
| */ |
| int kdb_flags; |
| atomic_t kdb_event; |
| |
| /* |
| * kdb_lock protects updates to kdb_initial_cpu. Used to |
| * single thread processors through the kernel debugger. |
| */ |
| int kdb_initial_cpu = -1; /* cpu number that owns kdb */ |
| int kdb_nextline = 1; |
| int kdb_state; /* General KDB state */ |
| |
| struct task_struct *kdb_current_task; |
| EXPORT_SYMBOL(kdb_current_task); |
| struct pt_regs *kdb_current_regs; |
| |
| const char *kdb_diemsg; |
| static int kdb_go_count; |
| #ifdef CONFIG_KDB_CONTINUE_CATASTROPHIC |
| static unsigned int kdb_continue_catastrophic = |
| CONFIG_KDB_CONTINUE_CATASTROPHIC; |
| #else |
| static unsigned int kdb_continue_catastrophic; |
| #endif |
| |
| /* kdb_commands describes the available commands. */ |
| static kdbtab_t *kdb_commands; |
| #define KDB_BASE_CMD_MAX 50 |
| static int kdb_max_commands = KDB_BASE_CMD_MAX; |
| static kdbtab_t kdb_base_commands[50]; |
| #define for_each_kdbcmd(cmd, num) \ |
| for ((cmd) = kdb_base_commands, (num) = 0; \ |
| num < kdb_max_commands; \ |
| num == KDB_BASE_CMD_MAX ? cmd = kdb_commands : cmd++, num++) |
| |
| typedef struct _kdbmsg { |
| int km_diag; /* kdb diagnostic */ |
| char *km_msg; /* Corresponding message text */ |
| } kdbmsg_t; |
| |
| #define KDBMSG(msgnum, text) \ |
| { KDB_##msgnum, text } |
| |
| static kdbmsg_t kdbmsgs[] = { |
| KDBMSG(NOTFOUND, "Command Not Found"), |
| KDBMSG(ARGCOUNT, "Improper argument count, see usage."), |
| KDBMSG(BADWIDTH, "Illegal value for BYTESPERWORD use 1, 2, 4 or 8, " |
| "8 is only allowed on 64 bit systems"), |
| KDBMSG(BADRADIX, "Illegal value for RADIX use 8, 10 or 16"), |
| KDBMSG(NOTENV, "Cannot find environment variable"), |
| KDBMSG(NOENVVALUE, "Environment variable should have value"), |
| KDBMSG(NOTIMP, "Command not implemented"), |
| KDBMSG(ENVFULL, "Environment full"), |
| KDBMSG(ENVBUFFULL, "Environment buffer full"), |
| KDBMSG(TOOMANYBPT, "Too many breakpoints defined"), |
| #ifdef CONFIG_CPU_XSCALE |
| KDBMSG(TOOMANYDBREGS, "More breakpoints than ibcr registers defined"), |
| #else |
| KDBMSG(TOOMANYDBREGS, "More breakpoints than db registers defined"), |
| #endif |
| KDBMSG(DUPBPT, "Duplicate breakpoint address"), |
| KDBMSG(BPTNOTFOUND, "Breakpoint not found"), |
| KDBMSG(BADMODE, "Invalid IDMODE"), |
| KDBMSG(BADINT, "Illegal numeric value"), |
| KDBMSG(INVADDRFMT, "Invalid symbolic address format"), |
| KDBMSG(BADREG, "Invalid register name"), |
| KDBMSG(BADCPUNUM, "Invalid cpu number"), |
| KDBMSG(BADLENGTH, "Invalid length field"), |
| KDBMSG(NOBP, "No Breakpoint exists"), |
| KDBMSG(BADADDR, "Invalid address"), |
| }; |
| #undef KDBMSG |
| |
| static const int __nkdb_err = sizeof(kdbmsgs) / sizeof(kdbmsg_t); |
| |
| |
| /* |
| * Initial environment. This is all kept static and local to |
| * this file. We don't want to rely on the memory allocation |
| * mechanisms in the kernel, so we use a very limited allocate-only |
| * heap for new and altered environment variables. The entire |
| * environment is limited to a fixed number of entries (add more |
| * to __env[] if required) and a fixed amount of heap (add more to |
| * KDB_ENVBUFSIZE if required). |
| */ |
| |
| static char *__env[] = { |
| #if defined(CONFIG_SMP) |
| "PROMPT=[%d]kdb> ", |
| "MOREPROMPT=[%d]more> ", |
| #else |
| "PROMPT=kdb> ", |
| "MOREPROMPT=more> ", |
| #endif |
| "RADIX=16", |
| "MDCOUNT=8", /* lines of md output */ |
| "BTARGS=9", /* 9 possible args in bt */ |
| KDB_PLATFORM_ENV, |
| "DTABCOUNT=30", |
| "NOSECT=1", |
| (char *)0, |
| (char *)0, |
| (char *)0, |
| (char *)0, |
| (char *)0, |
| (char *)0, |
| (char *)0, |
| (char *)0, |
| (char *)0, |
| (char *)0, |
| (char *)0, |
| (char *)0, |
| (char *)0, |
| (char *)0, |
| (char *)0, |
| (char *)0, |
| (char *)0, |
| (char *)0, |
| (char *)0, |
| (char *)0, |
| (char *)0, |
| (char *)0, |
| (char *)0, |
| }; |
| |
| static const int __nenv = (sizeof(__env) / sizeof(char *)); |
| |
| struct task_struct *kdb_curr_task(int cpu) |
| { |
| struct task_struct *p = curr_task(cpu); |
| #ifdef _TIF_MCA_INIT |
| if ((task_thread_info(p)->flags & _TIF_MCA_INIT) && KDB_TSK(cpu)) |
| p = krp->p; |
| #endif |
| return p; |
| } |
| |
| /* |
| * kdbgetenv - This function will return the character string value of |
| * an environment variable. |
| * Parameters: |
| * match A character string representing an environment variable. |
| * Returns: |
| * NULL No environment variable matches 'match' |
| * char* Pointer to string value of environment variable. |
| */ |
| char *kdbgetenv(const char *match) |
| { |
| char **ep = __env; |
| int matchlen = strlen(match); |
| int i; |
| |
| for (i = 0; i < __nenv; i++) { |
| char *e = *ep++; |
| |
| if (!e) |
| continue; |
| |
| if ((strncmp(match, e, matchlen) == 0) |
| && ((e[matchlen] == '\0') |
| || (e[matchlen] == '='))) { |
| char *cp = strchr(e, '='); |
| return cp ? ++cp : ""; |
| } |
| } |
| return NULL; |
| } |
| |
| /* |
| * kdballocenv - This function is used to allocate bytes for |
| * environment entries. |
| * Parameters: |
| * match A character string representing a numeric value |
| * Outputs: |
| * *value the unsigned long representation of the env variable 'match' |
| * Returns: |
| * Zero on success, a kdb diagnostic on failure. |
| * Remarks: |
| * We use a static environment buffer (envbuffer) to hold the values |
| * of dynamically generated environment variables (see kdb_set). Buffer |
| * space once allocated is never free'd, so over time, the amount of space |
| * (currently 512 bytes) will be exhausted if env variables are changed |
| * frequently. |
| */ |
| static char *kdballocenv(size_t bytes) |
| { |
| #define KDB_ENVBUFSIZE 512 |
| static char envbuffer[KDB_ENVBUFSIZE]; |
| static int envbufsize; |
| char *ep = NULL; |
| |
| if ((KDB_ENVBUFSIZE - envbufsize) >= bytes) { |
| ep = &envbuffer[envbufsize]; |
| envbufsize += bytes; |
| } |
| return ep; |
| } |
| |
| /* |
| * kdbgetulenv - This function will return the value of an unsigned |
| * long-valued environment variable. |
| * Parameters: |
| * match A character string representing a numeric value |
| * Outputs: |
| * *value the unsigned long represntation of the env variable 'match' |
| * Returns: |
| * Zero on success, a kdb diagnostic on failure. |
| */ |
| static int kdbgetulenv(const char *match, unsigned long *value) |
| { |
| char *ep; |
| |
| ep = kdbgetenv(match); |
| if (!ep) |
| return KDB_NOTENV; |
| if (strlen(ep) == 0) |
| return KDB_NOENVVALUE; |
| |
| *value = simple_strtoul(ep, NULL, 0); |
| |
| return 0; |
| } |
| |
| /* |
| * kdbgetintenv - This function will return the value of an |
| * integer-valued environment variable. |
| * Parameters: |
| * match A character string representing an integer-valued env variable |
| * Outputs: |
| * *value the integer representation of the environment variable 'match' |
| * Returns: |
| * Zero on success, a kdb diagnostic on failure. |
| */ |
| int kdbgetintenv(const char *match, int *value) |
| { |
| unsigned long val; |
| int diag; |
| |
| diag = kdbgetulenv(match, &val); |
| if (!diag) |
| *value = (int) val; |
| return diag; |
| } |
| |
| /* |
| * kdbgetularg - This function will convert a numeric string into an |
| * unsigned long value. |
| * Parameters: |
| * arg A character string representing a numeric value |
| * Outputs: |
| * *value the unsigned long represntation of arg. |
| * Returns: |
| * Zero on success, a kdb diagnostic on failure. |
| */ |
| int kdbgetularg(const char *arg, unsigned long *value) |
| { |
| char *endp; |
| unsigned long val; |
| |
| val = simple_strtoul(arg, &endp, 0); |
| |
| if (endp == arg) { |
| /* |
| * Try base 16, for us folks too lazy to type the |
| * leading 0x... |
| */ |
| val = simple_strtoul(arg, &endp, 16); |
| if (endp == arg) |
| return KDB_BADINT; |
| } |
| |
| *value = val; |
| |
| return 0; |
| } |
| |
| /* |
| * kdb_set - This function implements the 'set' command. Alter an |
| * existing environment variable or create a new one. |
| */ |
| int kdb_set(int argc, const char **argv) |
| { |
| int i; |
| char *ep; |
| size_t varlen, vallen; |
| |
| /* |
| * we can be invoked two ways: |
| * set var=value argv[1]="var", argv[2]="value" |
| * set var = value argv[1]="var", argv[2]="=", argv[3]="value" |
| * - if the latter, shift 'em down. |
| */ |
| if (argc == 3) { |
| argv[2] = argv[3]; |
| argc--; |
| } |
| |
| if (argc != 2) |
| return KDB_ARGCOUNT; |
| |
| /* |
| * Check for internal variables |
| */ |
| if (strcmp(argv[1], "KDBDEBUG") == 0) { |
| unsigned int debugflags; |
| char *cp; |
| |
| debugflags = simple_strtoul(argv[2], &cp, 0); |
| if (cp == argv[2] || debugflags & ~KDB_DEBUG_FLAG_MASK) { |
| kdb_printf("kdb: illegal debug flags '%s'\n", |
| argv[2]); |
| return 0; |
| } |
| kdb_flags = (kdb_flags & |
| ~(KDB_DEBUG_FLAG_MASK << KDB_DEBUG_FLAG_SHIFT)) |
| | (debugflags << KDB_DEBUG_FLAG_SHIFT); |
| |
| return 0; |
| } |
| |
| /* |
| * Tokenizer squashed the '=' sign. argv[1] is variable |
| * name, argv[2] = value. |
| */ |
| varlen = strlen(argv[1]); |
| vallen = strlen(argv[2]); |
| ep = kdballocenv(varlen + vallen + 2); |
| if (ep == (char *)0) |
| return KDB_ENVBUFFULL; |
| |
| sprintf(ep, "%s=%s", argv[1], argv[2]); |
| |
| ep[varlen+vallen+1] = '\0'; |
| |
| for (i = 0; i < __nenv; i++) { |
| if (__env[i] |
| && ((strncmp(__env[i], argv[1], varlen) == 0) |
| && ((__env[i][varlen] == '\0') |
| || (__env[i][varlen] == '=')))) { |
| __env[i] = ep; |
| return 0; |
| } |
| } |
| |
| /* |
| * Wasn't existing variable. Fit into slot. |
| */ |
| for (i = 0; i < __nenv-1; i++) { |
| if (__env[i] == (char *)0) { |
| __env[i] = ep; |
| return 0; |
| } |
| } |
| |
| return KDB_ENVFULL; |
| } |
| |
| static int kdb_check_regs(void) |
| { |
| if (!kdb_current_regs) { |
| kdb_printf("No current kdb registers." |
| " You may need to select another task\n"); |
| return KDB_BADREG; |
| } |
| return 0; |
| } |
| |
| /* |
| * kdbgetaddrarg - This function is responsible for parsing an |
| * address-expression and returning the value of the expression, |
| * symbol name, and offset to the caller. |
| * |
| * The argument may consist of a numeric value (decimal or |
| * hexidecimal), a symbol name, a register name (preceeded by the |
| * percent sign), an environment variable with a numeric value |
| * (preceeded by a dollar sign) or a simple arithmetic expression |
| * consisting of a symbol name, +/-, and a numeric constant value |
| * (offset). |
| * Parameters: |
| * argc - count of arguments in argv |
| * argv - argument vector |
| * *nextarg - index to next unparsed argument in argv[] |
| * regs - Register state at time of KDB entry |
| * Outputs: |
| * *value - receives the value of the address-expression |
| * *offset - receives the offset specified, if any |
| * *name - receives the symbol name, if any |
| * *nextarg - index to next unparsed argument in argv[] |
| * Returns: |
| * zero is returned on success, a kdb diagnostic code is |
| * returned on error. |
| */ |
| int kdbgetaddrarg(int argc, const char **argv, int *nextarg, |
| unsigned long *value, long *offset, |
| char **name) |
| { |
| unsigned long addr; |
| unsigned long off = 0; |
| int positive; |
| int diag; |
| int found = 0; |
| char *symname; |
| char symbol = '\0'; |
| char *cp; |
| kdb_symtab_t symtab; |
| |
| /* |
| * Process arguments which follow the following syntax: |
| * |
| * symbol | numeric-address [+/- numeric-offset] |
| * %register |
| * $environment-variable |
| */ |
| |
| if (*nextarg > argc) |
| return KDB_ARGCOUNT; |
| |
| symname = (char *)argv[*nextarg]; |
| |
| /* |
| * If there is no whitespace between the symbol |
| * or address and the '+' or '-' symbols, we |
| * remember the character and replace it with a |
| * null so the symbol/value can be properly parsed |
| */ |
| cp = strpbrk(symname, "+-"); |
| if (cp != NULL) { |
| symbol = *cp; |
| *cp++ = '\0'; |
| } |
| |
| if (symname[0] == '$') { |
| diag = kdbgetulenv(&symname[1], &addr); |
| if (diag) |
| return diag; |
| } else if (symname[0] == '%') { |
| diag = kdb_check_regs(); |
| if (diag) |
| return diag; |
| /* Implement register values with % at a later time as it is |
| * arch optional. |
| */ |
| return KDB_NOTIMP; |
| } else { |
| found = kdbgetsymval(symname, &symtab); |
| if (found) { |
| addr = symtab.sym_start; |
| } else { |
| diag = kdbgetularg(argv[*nextarg], &addr); |
| if (diag) |
| return diag; |
| } |
| } |
| |
| if (!found) |
| found = kdbnearsym(addr, &symtab); |
| |
| (*nextarg)++; |
| |
| if (name) |
| *name = symname; |
| if (value) |
| *value = addr; |
| if (offset && name && *name) |
| *offset = addr - symtab.sym_start; |
| |
| if ((*nextarg > argc) |
| && (symbol == '\0')) |
| return 0; |
| |
| /* |
| * check for +/- and offset |
| */ |
| |
| if (symbol == '\0') { |
| if ((argv[*nextarg][0] != '+') |
| && (argv[*nextarg][0] != '-')) { |
| /* |
| * Not our argument. Return. |
| */ |
| return 0; |
| } else { |
| positive = (argv[*nextarg][0] == '+'); |
| (*nextarg)++; |
| } |
| } else |
| positive = (symbol == '+'); |
| |
| /* |
| * Now there must be an offset! |
| */ |
| if ((*nextarg > argc) |
| && (symbol == '\0')) { |
| return KDB_INVADDRFMT; |
| } |
| |
| if (!symbol) { |
| cp = (char *)argv[*nextarg]; |
| (*nextarg)++; |
| } |
| |
| diag = kdbgetularg(cp, &off); |
| if (diag) |
| return diag; |
| |
| if (!positive) |
| off = -off; |
| |
| if (offset) |
| *offset += off; |
| |
| if (value) |
| *value += off; |
| |
| return 0; |
| } |
| |
| static void kdb_cmderror(int diag) |
| { |
| int i; |
| |
| if (diag >= 0) { |
| kdb_printf("no error detected (diagnostic is %d)\n", diag); |
| return; |
| } |
| |
| for (i = 0; i < __nkdb_err; i++) { |
| if (kdbmsgs[i].km_diag == diag) { |
| kdb_printf("diag: %d: %s\n", diag, kdbmsgs[i].km_msg); |
| return; |
| } |
| } |
| |
| kdb_printf("Unknown diag %d\n", -diag); |
| } |
| |
| /* |
| * kdb_defcmd, kdb_defcmd2 - This function implements the 'defcmd' |
| * command which defines one command as a set of other commands, |
| * terminated by endefcmd. kdb_defcmd processes the initial |
| * 'defcmd' command, kdb_defcmd2 is invoked from kdb_parse for |
| * the following commands until 'endefcmd'. |
| * Inputs: |
| * argc argument count |
| * argv argument vector |
| * Returns: |
| * zero for success, a kdb diagnostic if error |
| */ |
| struct defcmd_set { |
| int count; |
| int usable; |
| char *name; |
| char *usage; |
| char *help; |
| char **command; |
| }; |
| static struct defcmd_set *defcmd_set; |
| static int defcmd_set_count; |
| static int defcmd_in_progress; |
| |
| /* Forward references */ |
| static int kdb_exec_defcmd(int argc, const char **argv); |
| |
| static int kdb_defcmd2(const char *cmdstr, const char *argv0) |
| { |
| struct defcmd_set *s = defcmd_set + defcmd_set_count - 1; |
| char **save_command = s->command; |
| if (strcmp(argv0, "endefcmd") == 0) { |
| defcmd_in_progress = 0; |
| if (!s->count) |
| s->usable = 0; |
| if (s->usable) |
| kdb_register(s->name, kdb_exec_defcmd, |
| s->usage, s->help, 0); |
| return 0; |
| } |
| if (!s->usable) |
| return KDB_NOTIMP; |
| s->command = kmalloc((s->count + 1) * sizeof(*(s->command)), GFP_KDB); |
| if (!s->command) { |
| kdb_printf("Could not allocate new kdb_defcmd table for %s\n", |
| cmdstr); |
| s->usable = 0; |
| return KDB_NOTIMP; |
| } |
| memcpy(s->command, save_command, s->count * sizeof(*(s->command))); |
| s->command[s->count++] = kdb_strdup(cmdstr, GFP_KDB); |
| kfree(save_command); |
| return 0; |
| } |
| |
| static int kdb_defcmd(int argc, const char **argv) |
| { |
| struct defcmd_set *save_defcmd_set = defcmd_set, *s; |
| if (defcmd_in_progress) { |
| kdb_printf("kdb: nested defcmd detected, assuming missing " |
| "endefcmd\n"); |
| kdb_defcmd2("endefcmd", "endefcmd"); |
| } |
| if (argc == 0) { |
| int i; |
| for (s = defcmd_set; s < defcmd_set + defcmd_set_count; ++s) { |
| kdb_printf("defcmd %s \"%s\" \"%s\"\n", s->name, |
| s->usage, s->help); |
| for (i = 0; i < s->count; ++i) |
| kdb_printf("%s", s->command[i]); |
| kdb_printf("endefcmd\n"); |
| } |
| return 0; |
| } |
| if (argc != 3) |
| return KDB_ARGCOUNT; |
| defcmd_set = kmalloc((defcmd_set_count + 1) * sizeof(*defcmd_set), |
| GFP_KDB); |
| if (!defcmd_set) { |
| kdb_printf("Could not allocate new defcmd_set entry for %s\n", |
| argv[1]); |
| defcmd_set = save_defcmd_set; |
| return KDB_NOTIMP; |
| } |
| memcpy(defcmd_set, save_defcmd_set, |
| defcmd_set_count * sizeof(*defcmd_set)); |
| kfree(save_defcmd_set); |
| s = defcmd_set + defcmd_set_count; |
| memset(s, 0, sizeof(*s)); |
| s->usable = 1; |
| s->name = kdb_strdup(argv[1], GFP_KDB); |
| s->usage = kdb_strdup(argv[2], GFP_KDB); |
| s->help = kdb_strdup(argv[3], GFP_KDB); |
| if (s->usage[0] == '"') { |
| strcpy(s->usage, s->usage+1); |
| s->usage[strlen(s->usage)-1] = '\0'; |
| } |
| if (s->help[0] == '"') { |
| strcpy(s->help, s->help+1); |
| s->help[strlen(s->help)-1] = '\0'; |
| } |
| ++defcmd_set_count; |
| defcmd_in_progress = 1; |
| return 0; |
| } |
| |
| /* |
| * kdb_exec_defcmd - Execute the set of commands associated with this |
| * defcmd name. |
| * Inputs: |
| * argc argument count |
| * argv argument vector |
| * Returns: |
| * zero for success, a kdb diagnostic if error |
| */ |
| static int kdb_exec_defcmd(int argc, const char **argv) |
| { |
| int i, ret; |
| struct defcmd_set *s; |
| if (argc != 0) |
| return KDB_ARGCOUNT; |
| for (s = defcmd_set, i = 0; i < defcmd_set_count; ++i, ++s) { |
| if (strcmp(s->name, argv[0]) == 0) |
| break; |
| } |
| if (i == defcmd_set_count) { |
| kdb_printf("kdb_exec_defcmd: could not find commands for %s\n", |
| argv[0]); |
| return KDB_NOTIMP; |
| } |
| for (i = 0; i < s->count; ++i) { |
| /* Recursive use of kdb_parse, do not use argv after |
| * this point */ |
| argv = NULL; |
| kdb_printf("[%s]kdb> %s\n", s->name, s->command[i]); |
| ret = kdb_parse(s->command[i]); |
| if (ret) |
| return ret; |
| } |
| return 0; |
| } |
| |
| /* Command history */ |
| #define KDB_CMD_HISTORY_COUNT 32 |
| #define CMD_BUFLEN 200 /* kdb_printf: max printline |
| * size == 256 */ |
| static unsigned int cmd_head, cmd_tail; |
| static unsigned int cmdptr; |
| static char cmd_hist[KDB_CMD_HISTORY_COUNT][CMD_BUFLEN]; |
| static char cmd_cur[CMD_BUFLEN]; |
| |
| /* |
| * The "str" argument may point to something like | grep xyz |
| */ |
| static void parse_grep(const char *str) |
| { |
| int len; |
| char *cp = (char *)str, *cp2; |
| |
| /* sanity check: we should have been called with the \ first */ |
| if (*cp != '|') |
| return; |
| cp++; |
| while (isspace(*cp)) |
| cp++; |
| if (strncmp(cp, "grep ", 5)) { |
| kdb_printf("invalid 'pipe', see grephelp\n"); |
| return; |
| } |
| cp += 5; |
| while (isspace(*cp)) |
| cp++; |
| cp2 = strchr(cp, '\n'); |
| if (cp2) |
| *cp2 = '\0'; /* remove the trailing newline */ |
| len = strlen(cp); |
| if (len == 0) { |
| kdb_printf("invalid 'pipe', see grephelp\n"); |
| return; |
| } |
| /* now cp points to a nonzero length search string */ |
| if (*cp == '"') { |
| /* allow it be "x y z" by removing the "'s - there must |
| be two of them */ |
| cp++; |
| cp2 = strchr(cp, '"'); |
| if (!cp2) { |
| kdb_printf("invalid quoted string, see grephelp\n"); |
| return; |
| } |
| *cp2 = '\0'; /* end the string where the 2nd " was */ |
| } |
| kdb_grep_leading = 0; |
| if (*cp == '^') { |
| kdb_grep_leading = 1; |
| cp++; |
| } |
| len = strlen(cp); |
| kdb_grep_trailing = 0; |
| if (*(cp+len-1) == '$') { |
| kdb_grep_trailing = 1; |
| *(cp+len-1) = '\0'; |
| } |
| len = strlen(cp); |
| if (!len) |
| return; |
| if (len >= GREP_LEN) { |
| kdb_printf("search string too long\n"); |
| return; |
| } |
| strcpy(kdb_grep_string, cp); |
| kdb_grepping_flag++; |
| return; |
| } |
| |
| /* |
| * kdb_parse - Parse the command line, search the command table for a |
| * matching command and invoke the command function. This |
| * function may be called recursively, if it is, the second call |
| * will overwrite argv and cbuf. It is the caller's |
| * responsibility to save their argv if they recursively call |
| * kdb_parse(). |
| * Parameters: |
| * cmdstr The input command line to be parsed. |
| * regs The registers at the time kdb was entered. |
| * Returns: |
| * Zero for success, a kdb diagnostic if failure. |
| * Remarks: |
| * Limited to 20 tokens. |
| * |
| * Real rudimentary tokenization. Basically only whitespace |
| * is considered a token delimeter (but special consideration |
| * is taken of the '=' sign as used by the 'set' command). |
| * |
| * The algorithm used to tokenize the input string relies on |
| * there being at least one whitespace (or otherwise useless) |
| * character between tokens as the character immediately following |
| * the token is altered in-place to a null-byte to terminate the |
| * token string. |
| */ |
| |
| #define MAXARGC 20 |
| |
| int kdb_parse(const char *cmdstr) |
| { |
| static char *argv[MAXARGC]; |
| static int argc; |
| static char cbuf[CMD_BUFLEN+2]; |
| char *cp; |
| char *cpp, quoted; |
| kdbtab_t *tp; |
| int i, escaped, ignore_errors = 0, check_grep; |
| |
| /* |
| * First tokenize the command string. |
| */ |
| cp = (char *)cmdstr; |
| kdb_grepping_flag = check_grep = 0; |
| |
| if (KDB_FLAG(CMD_INTERRUPT)) { |
| /* Previous command was interrupted, newline must not |
| * repeat the command */ |
| KDB_FLAG_CLEAR(CMD_INTERRUPT); |
| KDB_STATE_SET(PAGER); |
| argc = 0; /* no repeat */ |
| } |
| |
| if (*cp != '\n' && *cp != '\0') { |
| argc = 0; |
| cpp = cbuf; |
| while (*cp) { |
| /* skip whitespace */ |
| while (isspace(*cp)) |
| cp++; |
| if ((*cp == '\0') || (*cp == '\n') || |
| (*cp == '#' && !defcmd_in_progress)) |
| break; |
| /* special case: check for | grep pattern */ |
| if (*cp == '|') { |
| check_grep++; |
| break; |
| } |
| if (cpp >= cbuf + CMD_BUFLEN) { |
| kdb_printf("kdb_parse: command buffer " |
| "overflow, command ignored\n%s\n", |
| cmdstr); |
| return KDB_NOTFOUND; |
| } |
| if (argc >= MAXARGC - 1) { |
| kdb_printf("kdb_parse: too many arguments, " |
| "command ignored\n%s\n", cmdstr); |
| return KDB_NOTFOUND; |
| } |
| argv[argc++] = cpp; |
| escaped = 0; |
| quoted = '\0'; |
| /* Copy to next unquoted and unescaped |
| * whitespace or '=' */ |
| while (*cp && *cp != '\n' && |
| (escaped || quoted || !isspace(*cp))) { |
| if (cpp >= cbuf + CMD_BUFLEN) |
| break; |
| if (escaped) { |
| escaped = 0; |
| *cpp++ = *cp++; |
| continue; |
| } |
| if (*cp == '\\') { |
| escaped = 1; |
| ++cp; |
| continue; |
| } |
| if (*cp == quoted) |
| quoted = '\0'; |
| else if (*cp == '\'' || *cp == '"') |
| quoted = *cp; |
| *cpp = *cp++; |
| if (*cpp == '=' && !quoted) |
| break; |
| ++cpp; |
| } |
| *cpp++ = '\0'; /* Squash a ws or '=' character */ |
| } |
| } |
| if (!argc) |
| return 0; |
| if (check_grep) |
| parse_grep(cp); |
| if (defcmd_in_progress) { |
| int result = kdb_defcmd2(cmdstr, argv[0]); |
| if (!defcmd_in_progress) { |
| argc = 0; /* avoid repeat on endefcmd */ |
| *(argv[0]) = '\0'; |
| } |
| return result; |
| } |
| if (argv[0][0] == '-' && argv[0][1] && |
| (argv[0][1] < '0' || argv[0][1] > '9')) { |
| ignore_errors = 1; |
| ++argv[0]; |
| } |
| |
| for_each_kdbcmd(tp, i) { |
| if (tp->cmd_name) { |
| /* |
| * If this command is allowed to be abbreviated, |
| * check to see if this is it. |
| */ |
| |
| if (tp->cmd_minlen |
| && (strlen(argv[0]) <= tp->cmd_minlen)) { |
| if (strncmp(argv[0], |
| tp->cmd_name, |
| tp->cmd_minlen) == 0) { |
| break; |
| } |
| } |
| |
| if (strcmp(argv[0], tp->cmd_name) == 0) |
| break; |
| } |
| } |
| |
| /* |
| * If we don't find a command by this name, see if the first |
| * few characters of this match any of the known commands. |
| * e.g., md1c20 should match md. |
| */ |
| if (i == kdb_max_commands) { |
| for_each_kdbcmd(tp, i) { |
| if (tp->cmd_name) { |
| if (strncmp(argv[0], |
| tp->cmd_name, |
| strlen(tp->cmd_name)) == 0) { |
| break; |
| } |
| } |
| } |
| } |
| |
| if (i < kdb_max_commands) { |
| int result; |
| KDB_STATE_SET(CMD); |
| result = (*tp->cmd_func)(argc-1, (const char **)argv); |
| if (result && ignore_errors && result > KDB_CMD_GO) |
| result = 0; |
| KDB_STATE_CLEAR(CMD); |
| switch (tp->cmd_repeat) { |
| case KDB_REPEAT_NONE: |
| argc = 0; |
| if (argv[0]) |
| *(argv[0]) = '\0'; |
| break; |
| case KDB_REPEAT_NO_ARGS: |
| argc = 1; |
| if (argv[1]) |
| *(argv[1]) = '\0'; |
| break; |
| case KDB_REPEAT_WITH_ARGS: |
| break; |
| } |
| return result; |
| } |
| |
| /* |
| * If the input with which we were presented does not |
| * map to an existing command, attempt to parse it as an |
| * address argument and display the result. Useful for |
| * obtaining the address of a variable, or the nearest symbol |
| * to an address contained in a register. |
| */ |
| { |
| unsigned long value; |
| char *name = NULL; |
| long offset; |
| int nextarg = 0; |
| |
| if (kdbgetaddrarg(0, (const char **)argv, &nextarg, |
| &value, &offset, &name)) { |
| return KDB_NOTFOUND; |
| } |
| |
| kdb_printf("%s = ", argv[0]); |
| kdb_symbol_print(value, NULL, KDB_SP_DEFAULT); |
| kdb_printf("\n"); |
| return 0; |
| } |
| } |
| |
| |
| static int handle_ctrl_cmd(char *cmd) |
| { |
| #define CTRL_P 16 |
| #define CTRL_N 14 |
| |
| /* initial situation */ |
| if (cmd_head == cmd_tail) |
| return 0; |
| switch (*cmd) { |
| case CTRL_P: |
| if (cmdptr != cmd_tail) |
| cmdptr = (cmdptr-1) % KDB_CMD_HISTORY_COUNT; |
| strncpy(cmd_cur, cmd_hist[cmdptr], CMD_BUFLEN); |
| return 1; |
| case CTRL_N: |
| if (cmdptr != cmd_head) |
| cmdptr = (cmdptr+1) % KDB_CMD_HISTORY_COUNT; |
| strncpy(cmd_cur, cmd_hist[cmdptr], CMD_BUFLEN); |
| return 1; |
| } |
| return 0; |
| } |
| |
| /* |
| * kdb_reboot - This function implements the 'reboot' command. Reboot |
| * the system immediately, or loop for ever on failure. |
| */ |
| static int kdb_reboot(int argc, const char **argv) |
| { |
| emergency_restart(); |
| kdb_printf("Hmm, kdb_reboot did not reboot, spinning here\n"); |
| while (1) |
| cpu_relax(); |
| /* NOTREACHED */ |
| return 0; |
| } |
| |
| static void kdb_dumpregs(struct pt_regs *regs) |
| { |
| int old_lvl = console_loglevel; |
| console_loglevel = 15; |
| kdb_trap_printk++; |
| show_regs(regs); |
| kdb_trap_printk--; |
| kdb_printf("\n"); |
| console_loglevel = old_lvl; |
| } |
| |
| void kdb_set_current_task(struct task_struct *p) |
| { |
| kdb_current_task = p; |
| |
| if (kdb_task_has_cpu(p)) { |
| kdb_current_regs = KDB_TSKREGS(kdb_process_cpu(p)); |
| return; |
| } |
| kdb_current_regs = NULL; |
| } |
| |
| /* |
| * kdb_local - The main code for kdb. This routine is invoked on a |
| * specific processor, it is not global. The main kdb() routine |
| * ensures that only one processor at a time is in this routine. |
| * This code is called with the real reason code on the first |
| * entry to a kdb session, thereafter it is called with reason |
| * SWITCH, even if the user goes back to the original cpu. |
| * Inputs: |
| * reason The reason KDB was invoked |
| * error The hardware-defined error code |
| * regs The exception frame at time of fault/breakpoint. |
| * db_result Result code from the break or debug point. |
| * Returns: |
| * 0 KDB was invoked for an event which it wasn't responsible |
| * 1 KDB handled the event for which it was invoked. |
| * KDB_CMD_GO User typed 'go'. |
| * KDB_CMD_CPU User switched to another cpu. |
| * KDB_CMD_SS Single step. |
| * KDB_CMD_SSB Single step until branch. |
| */ |
| static int kdb_local(kdb_reason_t reason, int error, struct pt_regs *regs, |
| kdb_dbtrap_t db_result) |
| { |
| char *cmdbuf; |
| int diag; |
| struct task_struct *kdb_current = |
| kdb_curr_task(raw_smp_processor_id()); |
| |
| KDB_DEBUG_STATE("kdb_local 1", reason); |
| kdb_go_count = 0; |
| if (reason == KDB_REASON_DEBUG) { |
| /* special case below */ |
| } else { |
| kdb_printf("\nEntering kdb (current=0x%p, pid %d) ", |
| kdb_current, kdb_current->pid); |
| #if defined(CONFIG_SMP) |
| kdb_printf("on processor %d ", raw_smp_processor_id()); |
| #endif |
| } |
| |
| switch (reason) { |
| case KDB_REASON_DEBUG: |
| { |
| /* |
| * If re-entering kdb after a single step |
| * command, don't print the message. |
| */ |
| switch (db_result) { |
| case KDB_DB_BPT: |
| kdb_printf("\nEntering kdb (0x%p, pid %d) ", |
| kdb_current, kdb_current->pid); |
| #if defined(CONFIG_SMP) |
| kdb_printf("on processor %d ", raw_smp_processor_id()); |
| #endif |
| kdb_printf("due to Debug @ " kdb_machreg_fmt "\n", |
| instruction_pointer(regs)); |
| break; |
| case KDB_DB_SSB: |
| /* |
| * In the midst of ssb command. Just return. |
| */ |
| KDB_DEBUG_STATE("kdb_local 3", reason); |
| return KDB_CMD_SSB; /* Continue with SSB command */ |
| |
| break; |
| case KDB_DB_SS: |
| break; |
| case KDB_DB_SSBPT: |
| KDB_DEBUG_STATE("kdb_local 4", reason); |
| return 1; /* kdba_db_trap did the work */ |
| default: |
| kdb_printf("kdb: Bad result from kdba_db_trap: %d\n", |
| db_result); |
| break; |
| } |
| |
| } |
| break; |
| case KDB_REASON_ENTER: |
| if (KDB_STATE(KEYBOARD)) |
| kdb_printf("due to Keyboard Entry\n"); |
| else |
| kdb_printf("due to KDB_ENTER()\n"); |
| break; |
| case KDB_REASON_KEYBOARD: |
| KDB_STATE_SET(KEYBOARD); |
| kdb_printf("due to Keyboard Entry\n"); |
| break; |
| case KDB_REASON_ENTER_SLAVE: |
| /* drop through, slaves only get released via cpu switch */ |
| case KDB_REASON_SWITCH: |
| kdb_printf("due to cpu switch\n"); |
| break; |
| case KDB_REASON_OOPS: |
| kdb_printf("Oops: %s\n", kdb_diemsg); |
| kdb_printf("due to oops @ " kdb_machreg_fmt "\n", |
| instruction_pointer(regs)); |
| kdb_dumpregs(regs); |
| break; |
| case KDB_REASON_NMI: |
| kdb_printf("due to NonMaskable Interrupt @ " |
| kdb_machreg_fmt "\n", |
| instruction_pointer(regs)); |
| kdb_dumpregs(regs); |
| break; |
| case KDB_REASON_SSTEP: |
| case KDB_REASON_BREAK: |
| kdb_printf("due to %s @ " kdb_machreg_fmt "\n", |
| reason == KDB_REASON_BREAK ? |
| "Breakpoint" : "SS trap", instruction_pointer(regs)); |
| /* |
| * Determine if this breakpoint is one that we |
| * are interested in. |
| */ |
| if (db_result != KDB_DB_BPT) { |
| kdb_printf("kdb: error return from kdba_bp_trap: %d\n", |
| db_result); |
| KDB_DEBUG_STATE("kdb_local 6", reason); |
| return 0; /* Not for us, dismiss it */ |
| } |
| break; |
| case KDB_REASON_RECURSE: |
| kdb_printf("due to Recursion @ " kdb_machreg_fmt "\n", |
| instruction_pointer(regs)); |
| break; |
| default: |
| kdb_printf("kdb: unexpected reason code: %d\n", reason); |
| KDB_DEBUG_STATE("kdb_local 8", reason); |
| return 0; /* Not for us, dismiss it */ |
| } |
| |
| while (1) { |
| /* |
| * Initialize pager context. |
| */ |
| kdb_nextline = 1; |
| KDB_STATE_CLEAR(SUPPRESS); |
| |
| cmdbuf = cmd_cur; |
| *cmdbuf = '\0'; |
| *(cmd_hist[cmd_head]) = '\0'; |
| |
| if (KDB_FLAG(ONLY_DO_DUMP)) { |
| /* kdb is off but a catastrophic error requires a dump. |
| * Take the dump and reboot. |
| * Turn on logging so the kdb output appears in the log |
| * buffer in the dump. |
| */ |
| const char *setargs[] = { "set", "LOGGING", "1" }; |
| kdb_set(2, setargs); |
| kdb_reboot(0, NULL); |
| /*NOTREACHED*/ |
| } |
| |
| do_full_getstr: |
| #if defined(CONFIG_SMP) |
| snprintf(kdb_prompt_str, CMD_BUFLEN, kdbgetenv("PROMPT"), |
| raw_smp_processor_id()); |
| #else |
| snprintf(kdb_prompt_str, CMD_BUFLEN, kdbgetenv("PROMPT")); |
| #endif |
| if (defcmd_in_progress) |
| strncat(kdb_prompt_str, "[defcmd]", CMD_BUFLEN); |
| |
| /* |
| * Fetch command from keyboard |
| */ |
| cmdbuf = kdb_getstr(cmdbuf, CMD_BUFLEN, kdb_prompt_str); |
| if (*cmdbuf != '\n') { |
| if (*cmdbuf < 32) { |
| if (cmdptr == cmd_head) { |
| strncpy(cmd_hist[cmd_head], cmd_cur, |
| CMD_BUFLEN); |
| *(cmd_hist[cmd_head] + |
| strlen(cmd_hist[cmd_head])-1) = '\0'; |
| } |
| if (!handle_ctrl_cmd(cmdbuf)) |
| *(cmd_cur+strlen(cmd_cur)-1) = '\0'; |
| cmdbuf = cmd_cur; |
| goto do_full_getstr; |
| } else { |
| strncpy(cmd_hist[cmd_head], cmd_cur, |
| CMD_BUFLEN); |
| } |
| |
| cmd_head = (cmd_head+1) % KDB_CMD_HISTORY_COUNT; |
| if (cmd_head == cmd_tail) |
| cmd_tail = (cmd_tail+1) % KDB_CMD_HISTORY_COUNT; |
| } |
| |
| cmdptr = cmd_head; |
| diag = kdb_parse(cmdbuf); |
| if (diag == KDB_NOTFOUND) { |
| kdb_printf("Unknown kdb command: '%s'\n", cmdbuf); |
| diag = 0; |
| } |
| if (diag == KDB_CMD_GO |
| || diag == KDB_CMD_CPU |
| || diag == KDB_CMD_SS |
| || diag == KDB_CMD_SSB |
| || diag == KDB_CMD_KGDB) |
| break; |
| |
| if (diag) |
| kdb_cmderror(diag); |
| } |
| KDB_DEBUG_STATE("kdb_local 9", diag); |
| return diag; |
| } |
| |
| |
| /* |
| * kdb_print_state - Print the state data for the current processor |
| * for debugging. |
| * Inputs: |
| * text Identifies the debug point |
| * value Any integer value to be printed, e.g. reason code. |
| */ |
| void kdb_print_state(const char *text, int value) |
| { |
| kdb_printf("state: %s cpu %d value %d initial %d state %x\n", |
| text, raw_smp_processor_id(), value, kdb_initial_cpu, |
| kdb_state); |
| } |
| |
| /* |
| * kdb_main_loop - After initial setup and assignment of the |
| * controlling cpu, all cpus are in this loop. One cpu is in |
| * control and will issue the kdb prompt, the others will spin |
| * until 'go' or cpu switch. |
| * |
| * To get a consistent view of the kernel stacks for all |
| * processes, this routine is invoked from the main kdb code via |
| * an architecture specific routine. kdba_main_loop is |
| * responsible for making the kernel stacks consistent for all |
| * processes, there should be no difference between a blocked |
| * process and a running process as far as kdb is concerned. |
| * Inputs: |
| * reason The reason KDB was invoked |
| * error The hardware-defined error code |
| * reason2 kdb's current reason code. |
| * Initially error but can change |
| * acording to kdb state. |
| * db_result Result code from break or debug point. |
| * regs The exception frame at time of fault/breakpoint. |
| * should always be valid. |
| * Returns: |
| * 0 KDB was invoked for an event which it wasn't responsible |
| * 1 KDB handled the event for which it was invoked. |
| */ |
| int kdb_main_loop(kdb_reason_t reason, kdb_reason_t reason2, int error, |
| kdb_dbtrap_t db_result, struct pt_regs *regs) |
| { |
| int result = 1; |
| /* Stay in kdb() until 'go', 'ss[b]' or an error */ |
| while (1) { |
| /* |
| * All processors except the one that is in control |
| * will spin here. |
| */ |
| KDB_DEBUG_STATE("kdb_main_loop 1", reason); |
| while (KDB_STATE(HOLD_CPU)) { |
| /* state KDB is turned off by kdb_cpu to see if the |
| * other cpus are still live, each cpu in this loop |
| * turns it back on. |
| */ |
| if (!KDB_STATE(KDB)) |
| KDB_STATE_SET(KDB); |
| } |
| |
| KDB_STATE_CLEAR(SUPPRESS); |
| KDB_DEBUG_STATE("kdb_main_loop 2", reason); |
| if (KDB_STATE(LEAVING)) |
| break; /* Another cpu said 'go' */ |
| /* Still using kdb, this processor is in control */ |
| result = kdb_local(reason2, error, regs, db_result); |
| KDB_DEBUG_STATE("kdb_main_loop 3", result); |
| |
| if (result == KDB_CMD_CPU) |
| break; |
| |
| if (result == KDB_CMD_SS) { |
| KDB_STATE_SET(DOING_SS); |
| break; |
| } |
| |
| if (result == KDB_CMD_SSB) { |
| KDB_STATE_SET(DOING_SS); |
| KDB_STATE_SET(DOING_SSB); |
| break; |
| } |
| |
| if (result == KDB_CMD_KGDB) { |
| if (!(KDB_STATE(DOING_KGDB) || KDB_STATE(DOING_KGDB2))) |
| kdb_printf("Entering please attach debugger " |
| "or use $D#44+ or $3#33\n"); |
| break; |
| } |
| if (result && result != 1 && result != KDB_CMD_GO) |
| kdb_printf("\nUnexpected kdb_local return code %d\n", |
| result); |
| KDB_DEBUG_STATE("kdb_main_loop 4", reason); |
| break; |
| } |
| if (KDB_STATE(DOING_SS)) |
| KDB_STATE_CLEAR(SSBPT); |
| |
| return result; |
| } |
| |
| /* |
| * kdb_mdr - This function implements the guts of the 'mdr', memory |
| * read command. |
| * mdr <addr arg>,<byte count> |
| * Inputs: |
| * addr Start address |
| * count Number of bytes |
| * Returns: |
| * Always 0. Any errors are detected and printed by kdb_getarea. |
| */ |
| static int kdb_mdr(unsigned long addr, unsigned int count) |
| { |
| unsigned char c; |
| while (count--) { |
| if (kdb_getarea(c, addr)) |
| return 0; |
| kdb_printf("%02x", c); |
| addr++; |
| } |
| kdb_printf("\n"); |
| return 0; |
| } |
| |
| /* |
| * kdb_md - This function implements the 'md', 'md1', 'md2', 'md4', |
| * 'md8' 'mdr' and 'mds' commands. |
| * |
| * md|mds [<addr arg> [<line count> [<radix>]]] |
| * mdWcN [<addr arg> [<line count> [<radix>]]] |
| * where W = is the width (1, 2, 4 or 8) and N is the count. |
| * for eg., md1c20 reads 20 bytes, 1 at a time. |
| * mdr <addr arg>,<byte count> |
| */ |
| static void kdb_md_line(const char *fmtstr, unsigned long addr, |
| int symbolic, int nosect, int bytesperword, |
| int num, int repeat, int phys) |
| { |
| /* print just one line of data */ |
| kdb_symtab_t symtab; |
| char cbuf[32]; |
| char *c = cbuf; |
| int i; |
| unsigned long word; |
| |
| memset(cbuf, '\0', sizeof(cbuf)); |
| if (phys) |
| kdb_printf("phys " kdb_machreg_fmt0 " ", addr); |
| else |
| kdb_printf(kdb_machreg_fmt0 " ", addr); |
| |
| for (i = 0; i < num && repeat--; i++) { |
| if (phys) { |
| if (kdb_getphysword(&word, addr, bytesperword)) |
| break; |
| } else if (kdb_getword(&word, addr, bytesperword)) |
| break; |
| kdb_printf(fmtstr, word); |
| if (symbolic) |
| kdbnearsym(word, &symtab); |
| else |
| memset(&symtab, 0, sizeof(symtab)); |
| if (symtab.sym_name) { |
| kdb_symbol_print(word, &symtab, 0); |
| if (!nosect) { |
| kdb_printf("\n"); |
| kdb_printf(" %s %s " |
| kdb_machreg_fmt " " |
| kdb_machreg_fmt " " |
| kdb_machreg_fmt, symtab.mod_name, |
| symtab.sec_name, symtab.sec_start, |
| symtab.sym_start, symtab.sym_end); |
| } |
| addr += bytesperword; |
| } else { |
| union { |
| u64 word; |
| unsigned char c[8]; |
| } wc; |
| unsigned char *cp; |
| #ifdef __BIG_ENDIAN |
| cp = wc.c + 8 - bytesperword; |
| #else |
| cp = wc.c; |
| #endif |
| wc.word = word; |
| #define printable_char(c) \ |
| ({unsigned char __c = c; isascii(__c) && isprint(__c) ? __c : '.'; }) |
| switch (bytesperword) { |
| case 8: |
| *c++ = printable_char(*cp++); |
| *c++ = printable_char(*cp++); |
| *c++ = printable_char(*cp++); |
| *c++ = printable_char(*cp++); |
| addr += 4; |
| case 4: |
| *c++ = printable_char(*cp++); |
| *c++ = printable_char(*cp++); |
| addr += 2; |
| case 2: |
| *c++ = printable_char(*cp++); |
| addr++; |
| case 1: |
| *c++ = printable_char(*cp++); |
| addr++; |
| break; |
| } |
| #undef printable_char |
| } |
| } |
| kdb_printf("%*s %s\n", (int)((num-i)*(2*bytesperword + 1)+1), |
| " ", cbuf); |
| } |
| |
| static int kdb_md(int argc, const char **argv) |
| { |
| static unsigned long last_addr; |
| static int last_radix, last_bytesperword, last_repeat; |
| int radix = 16, mdcount = 8, bytesperword = KDB_WORD_SIZE, repeat; |
| int nosect = 0; |
| char fmtchar, fmtstr[64]; |
| unsigned long addr; |
| unsigned long word; |
| long offset = 0; |
| int symbolic = 0; |
| int valid = 0; |
| int phys = 0; |
| |
| kdbgetintenv("MDCOUNT", &mdcount); |
| kdbgetintenv("RADIX", &radix); |
| kdbgetintenv("BYTESPERWORD", &bytesperword); |
| |
| /* Assume 'md <addr>' and start with environment values */ |
| repeat = mdcount * 16 / bytesperword; |
| |
| if (strcmp(argv[0], "mdr") == 0) { |
| if (argc != 2) |
| return KDB_ARGCOUNT; |
| valid = 1; |
| } else if (isdigit(argv[0][2])) { |
| bytesperword = (int)(argv[0][2] - '0'); |
| if (bytesperword == 0) { |
| bytesperword = last_bytesperword; |
| if (bytesperword == 0) |
| bytesperword = 4; |
| } |
| last_bytesperword = bytesperword; |
| repeat = mdcount * 16 / bytesperword; |
| if (!argv[0][3]) |
| valid = 1; |
| else if (argv[0][3] == 'c' && argv[0][4]) { |
| char *p; |
| repeat = simple_strtoul(argv[0] + 4, &p, 10); |
| mdcount = ((repeat * bytesperword) + 15) / 16; |
| valid = !*p; |
| } |
| last_repeat = repeat; |
| } else if (strcmp(argv[0], "md") == 0) |
| valid = 1; |
| else if (strcmp(argv[0], "mds") == 0) |
| valid = 1; |
| else if (strcmp(argv[0], "mdp") == 0) { |
| phys = valid = 1; |
| } |
| if (!valid) |
| return KDB_NOTFOUND; |
| |
| if (argc == 0) { |
| if (last_addr == 0) |
| return KDB_ARGCOUNT; |
| addr = last_addr; |
| radix = last_radix; |
| bytesperword = last_bytesperword; |
| repeat = last_repeat; |
| mdcount = ((repeat * bytesperword) + 15) / 16; |
| } |
| |
| if (argc) { |
| unsigned long val; |
| int diag, nextarg = 1; |
| diag = kdbgetaddrarg(argc, argv, &nextarg, &addr, |
| &offset, NULL); |
| if (diag) |
| return diag; |
| if (argc > nextarg+2) |
| return KDB_ARGCOUNT; |
| |
| if (argc >= nextarg) { |
| diag = kdbgetularg(argv[nextarg], &val); |
| if (!diag) { |
| mdcount = (int) val; |
| repeat = mdcount * 16 / bytesperword; |
| } |
| } |
| if (argc >= nextarg+1) { |
| diag = kdbgetularg(argv[nextarg+1], &val); |
| if (!diag) |
| radix = (int) val; |
| } |
| } |
| |
| if (strcmp(argv[0], "mdr") == 0) |
| return kdb_mdr(addr, mdcount); |
| |
| switch (radix) { |
| case 10: |
| fmtchar = 'd'; |
| break; |
| case 16: |
| fmtchar = 'x'; |
| break; |
| case 8: |
| fmtchar = 'o'; |
| break; |
| default: |
| return KDB_BADRADIX; |
| } |
| |
| last_radix = radix; |
| |
| if (bytesperword > KDB_WORD_SIZE) |
| return KDB_BADWIDTH; |
| |
| switch (bytesperword) { |
| case 8: |
| sprintf(fmtstr, "%%16.16l%c ", fmtchar); |
| break; |
| case 4: |
| sprintf(fmtstr, "%%8.8l%c ", fmtchar); |
| break; |
| case 2: |
| sprintf(fmtstr, "%%4.4l%c ", fmtchar); |
| break; |
| case 1: |
| sprintf(fmtstr, "%%2.2l%c ", fmtchar); |
| break; |
| default: |
| return KDB_BADWIDTH; |
| } |
| |
| last_repeat = repeat; |
| last_bytesperword = bytesperword; |
| |
| if (strcmp(argv[0], "mds") == 0) { |
| symbolic = 1; |
| /* Do not save these changes as last_*, they are temporary mds |
| * overrides. |
| */ |
| bytesperword = KDB_WORD_SIZE; |
| repeat = mdcount; |
| kdbgetintenv("NOSECT", &nosect); |
| } |
| |
| /* Round address down modulo BYTESPERWORD */ |
| |
| addr &= ~(bytesperword-1); |
| |
| while (repeat > 0) { |
| unsigned long a; |
| int n, z, num = (symbolic ? 1 : (16 / bytesperword)); |
| |
| if (KDB_FLAG(CMD_INTERRUPT)) |
| return 0; |
| for (a = addr, z = 0; z < repeat; a += bytesperword, ++z) { |
| if (phys) { |
| if (kdb_getphysword(&word, a, bytesperword) |
| || word) |
| break; |
| } else if (kdb_getword(&word, a, bytesperword) || word) |
| break; |
| } |
| n = min(num, repeat); |
| kdb_md_line(fmtstr, addr, symbolic, nosect, bytesperword, |
| num, repeat, phys); |
| addr += bytesperword * n; |
| repeat -= n; |
| z = (z + num - 1) / num; |
| if (z > 2) { |
| int s = num * (z-2); |
| kdb_printf(kdb_machreg_fmt0 "-" kdb_machreg_fmt0 |
| " zero suppressed\n", |
| addr, addr + bytesperword * s - 1); |
| addr += bytesperword * s; |
| repeat -= s; |
| } |
| } |
| last_addr = addr; |
| |
| return 0; |
| } |
| |
| /* |
| * kdb_mm - This function implements the 'mm' command. |
| * mm address-expression new-value |
| * Remarks: |
| * mm works on machine words, mmW works on bytes. |
| */ |
| static int kdb_mm(int argc, const char **argv) |
| { |
| int diag; |
| unsigned long addr; |
| long offset = 0; |
| unsigned long contents; |
| int nextarg; |
| int width; |
| |
| if (argv[0][2] && !isdigit(argv[0][2])) |
| return KDB_NOTFOUND; |
| |
| if (argc < 2) |
| return KDB_ARGCOUNT; |
| |
| nextarg = 1; |
| diag = kdbgetaddrarg(argc, argv, &nextarg, &addr, &offset, NULL); |
| if (diag) |
| return diag; |
| |
| if (nextarg > argc) |
| return KDB_ARGCOUNT; |
| diag = kdbgetaddrarg(argc, argv, &nextarg, &contents, NULL, NULL); |
| if (diag) |
| return diag; |
| |
| if (nextarg != argc + 1) |
| return KDB_ARGCOUNT; |
| |
| width = argv[0][2] ? (argv[0][2] - '0') : (KDB_WORD_SIZE); |
| diag = kdb_putword(addr, contents, width); |
| if (diag) |
| return diag; |
| |
| kdb_printf(kdb_machreg_fmt " = " kdb_machreg_fmt "\n", addr, contents); |
| |
| return 0; |
| } |
| |
| /* |
| * kdb_go - This function implements the 'go' command. |
| * go [address-expression] |
| */ |
| static int kdb_go(int argc, const char **argv) |
| { |
| unsigned long addr; |
| int diag; |
| int nextarg; |
| long offset; |
| |
| if (argc == 1) { |
| if (raw_smp_processor_id() != kdb_initial_cpu) { |
| kdb_printf("go <address> must be issued from the " |
| "initial cpu, do cpu %d first\n", |
| kdb_initial_cpu); |
| return KDB_ARGCOUNT; |
| } |
| nextarg = 1; |
| diag = kdbgetaddrarg(argc, argv, &nextarg, |
| &addr, &offset, NULL); |
| if (diag) |
| return diag; |
| } else if (argc) { |
| return KDB_ARGCOUNT; |
| } |
| |
| diag = KDB_CMD_GO; |
| if (KDB_FLAG(CATASTROPHIC)) { |
| kdb_printf("Catastrophic error detected\n"); |
| kdb_printf("kdb_continue_catastrophic=%d, ", |
| kdb_continue_catastrophic); |
| if (kdb_continue_catastrophic == 0 && kdb_go_count++ == 0) { |
| kdb_printf("type go a second time if you really want " |
| "to continue\n"); |
| return 0; |
| } |
| if (kdb_continue_catastrophic == 2) { |
| kdb_printf("forcing reboot\n"); |
| kdb_reboot(0, NULL); |
| } |
| kdb_printf("attempting to continue\n"); |
| } |
| return diag; |
| } |
| |
| /* |
| * kdb_rd - This function implements the 'rd' command. |
| */ |
| static int kdb_rd(int argc, const char **argv) |
| { |
| int diag = kdb_check_regs(); |
| if (diag) |
| return diag; |
| |
| kdb_dumpregs(kdb_current_regs); |
| return 0; |
| } |
| |
| /* |
| * kdb_rm - This function implements the 'rm' (register modify) command. |
| * rm register-name new-contents |
| * Remarks: |
| * Currently doesn't allow modification of control or |
| * debug registers. |
| */ |
| static int kdb_rm(int argc, const char **argv) |
| { |
| int diag; |
| int ind = 0; |
| unsigned long contents; |
| |
| if (argc != 2) |
| return KDB_ARGCOUNT; |
| /* |
| * Allow presence or absence of leading '%' symbol. |
| */ |
| if (argv[1][0] == '%') |
| ind = 1; |
| |
| diag = kdbgetularg(argv[2], &contents); |
| if (diag) |
| return diag; |
| |
| diag = kdb_check_regs(); |
| if (diag) |
| return diag; |
| kdb_printf("ERROR: Register set currently not implemented\n"); |
| return 0; |
| } |
| |
| #if defined(CONFIG_MAGIC_SYSRQ) |
| /* |
| * kdb_sr - This function implements the 'sr' (SYSRQ key) command |
| * which interfaces to the soi-disant MAGIC SYSRQ functionality. |
| * sr <magic-sysrq-code> |
| */ |
| static int kdb_sr(int argc, const char **argv) |
| { |
| if (argc != 1) |
| return KDB_ARGCOUNT; |
| sysrq_toggle_support(1); |
| kdb_trap_printk++; |
| handle_sysrq(*argv[1], NULL); |
| kdb_trap_printk--; |
| |
| return 0; |
| } |
| #endif /* CONFIG_MAGIC_SYSRQ */ |
| |
| /* |
| * kdb_ef - This function implements the 'regs' (display exception |
| * frame) command. This command takes an address and expects to |
| * find an exception frame at that address, formats and prints |
| * it. |
| * regs address-expression |
| * Remarks: |
| * Not done yet. |
| */ |
| static int kdb_ef(int argc, const char **argv) |
| { |
| int diag; |
| unsigned long addr; |
| long offset; |
| int nextarg; |
| |
| if (argc != 1) |
| return KDB_ARGCOUNT; |
| |
| nextarg = 1; |
| diag = kdbgetaddrarg(argc, argv, &nextarg, &addr, &offset, NULL); |
| if (diag) |
| return diag; |
| show_regs((struct pt_regs *)addr); |
| return 0; |
| } |
| |
| #if defined(CONFIG_MODULES) |
| /* |
| * kdb_lsmod - This function implements the 'lsmod' command. Lists |
| * currently loaded kernel modules. |
| * Mostly taken from userland lsmod. |
| */ |
| static int kdb_lsmod(int argc, const char **argv) |
| { |
| struct module *mod; |
| |
| if (argc != 0) |
| return KDB_ARGCOUNT; |
| |
| kdb_printf("Module Size modstruct Used by\n"); |
| list_for_each_entry(mod, kdb_modules, list) { |
| |
| kdb_printf("%-20s%8u 0x%p ", mod->name, |
| mod->core_size, (void *)mod); |
| #ifdef CONFIG_MODULE_UNLOAD |
| kdb_printf("%4d ", module_refcount(mod)); |
| #endif |
| if (mod->state == MODULE_STATE_GOING) |
| kdb_printf(" (Unloading)"); |
| else if (mod->state == MODULE_STATE_COMING) |
| kdb_printf(" (Loading)"); |
| else |
| kdb_printf(" (Live)"); |
| |
| #ifdef CONFIG_MODULE_UNLOAD |
| { |
| struct module_use *use; |
| kdb_printf(" [ "); |
| list_for_each_entry(use, &mod->source_list, |
| source_list) |
| kdb_printf("%s ", use->target->name); |
| kdb_printf("]\n"); |
| } |
| #endif |
| } |
| |
| return 0; |
| } |
| |
| #endif /* CONFIG_MODULES */ |
| |
| /* |
| * kdb_env - This function implements the 'env' command. Display the |
| * current environment variables. |
| */ |
| |
| static int kdb_env(int argc, const char **argv) |
| { |
| int i; |
| |
| for (i = 0; i < __nenv; i++) { |
| if (__env[i]) |
| kdb_printf("%s\n", __env[i]); |
| } |
| |
| if (KDB_DEBUG(MASK)) |
| kdb_printf("KDBFLAGS=0x%x\n", kdb_flags); |
| |
| return 0; |
| } |
| |
| #ifdef CONFIG_PRINTK |
| /* |
| * kdb_dmesg - This function implements the 'dmesg' command to display |
| * the contents of the syslog buffer. |
| * dmesg [lines] [adjust] |
| */ |
| static int kdb_dmesg(int argc, const char **argv) |
| { |
| char *syslog_data[4], *start, *end, c = '\0', *p; |
| int diag, logging, logsize, lines = 0, adjust = 0, n; |
| |
| if (argc > 2) |
| return KDB_ARGCOUNT; |
| if (argc) { |
| char *cp; |
| lines = simple_strtol(argv[1], &cp, 0); |
| if (*cp) |
| lines = 0; |
| if (argc > 1) { |
| adjust = simple_strtoul(argv[2], &cp, 0); |
| if (*cp || adjust < 0) |
| adjust = 0; |
| } |
| } |
| |
| /* disable LOGGING if set */ |
| diag = kdbgetintenv("LOGGING", &logging); |
| if (!diag && logging) { |
| const char *setargs[] = { "set", "LOGGING", "0" }; |
| kdb_set(2, setargs); |
| } |
| |
| /* syslog_data[0,1] physical start, end+1. syslog_data[2,3] |
| * logical start, end+1. */ |
| kdb_syslog_data(syslog_data); |
| if (syslog_data[2] == syslog_data[3]) |
| return 0; |
| logsize = syslog_data[1] - syslog_data[0]; |
| start = syslog_data[2]; |
| end = syslog_data[3]; |
| #define KDB_WRAP(p) (((p - syslog_data[0]) % logsize) + syslog_data[0]) |
| for (n = 0, p = start; p < end; ++p) { |
| c = *KDB_WRAP(p); |
| if (c == '\n') |
| ++n; |
| } |
| if (c != '\n') |
| ++n; |
| if (lines < 0) { |
| if (adjust >= n) |
| kdb_printf("buffer only contains %d lines, nothing " |
| "printed\n", n); |
| else if (adjust - lines >= n) |
| kdb_printf("buffer only contains %d lines, last %d " |
| "lines printed\n", n, n - adjust); |
| if (adjust) { |
| for (; start < end && adjust; ++start) { |
| if (*KDB_WRAP(start) == '\n') |
| --adjust; |
| } |
| if (start < end) |
| ++start; |
| } |
| for (p = start; p < end && lines; ++p) { |
| if (*KDB_WRAP(p) == '\n') |
| ++lines; |
| } |
| end = p; |
| } else if (lines > 0) { |
| int skip = n - (adjust + lines); |
| if (adjust >= n) { |
| kdb_printf("buffer only contains %d lines, " |
| "nothing printed\n", n); |
| skip = n; |
| } else if (skip < 0) { |
| lines += skip; |
| skip = 0; |
| kdb_printf("buffer only contains %d lines, first " |
| "%d lines printed\n", n, lines); |
| } |
| for (; start < end && skip; ++start) { |
| if (*KDB_WRAP(start) == '\n') |
| --skip; |
| } |
| for (p = start; p < end && lines; ++p) { |
| if (*KDB_WRAP(p) == '\n') |
| --lines; |
| } |
| end = p; |
| } |
| /* Do a line at a time (max 200 chars) to reduce protocol overhead */ |
| c = '\n'; |
| while (start != end) { |
| char buf[201]; |
| p = buf; |
| if (KDB_FLAG(CMD_INTERRUPT)) |
| return 0; |
| while (start < end && (c = *KDB_WRAP(start)) && |
| (p - buf) < sizeof(buf)-1) { |
| ++start; |
| *p++ = c; |
| if (c == '\n') |
| break; |
| } |
| *p = '\0'; |
| kdb_printf("%s", buf); |
| } |
| if (c != '\n') |
| kdb_printf("\n"); |
| |
| return 0; |
| } |
| #endif /* CONFIG_PRINTK */ |
| /* |
| * kdb_cpu - This function implements the 'cpu' command. |
| * cpu [<cpunum>] |
| * Returns: |
| * KDB_CMD_CPU for success, a kdb diagnostic if error |
| */ |
| static void kdb_cpu_status(void) |
| { |
| int i, start_cpu, first_print = 1; |
| char state, prev_state = '?'; |
| |
| kdb_printf("Currently on cpu %d\n", raw_smp_processor_id()); |
| kdb_printf("Available cpus: "); |
| for (start_cpu = -1, i = 0; i < NR_CPUS; i++) { |
| if (!cpu_online(i)) { |
| state = 'F'; /* cpu is offline */ |
| } else { |
| state = ' '; /* cpu is responding to kdb */ |
| if (kdb_task_state_char(KDB_TSK(i)) == 'I') |
| state = 'I'; /* idle task */ |
| } |
| if (state != prev_state) { |
| if (prev_state != '?') { |
| if (!first_print) |
| kdb_printf(", "); |
| first_print = 0; |
| kdb_printf("%d", start_cpu); |
| if (start_cpu < i-1) |
| kdb_printf("-%d", i-1); |
| if (prev_state != ' ') |
| kdb_printf("(%c)", prev_state); |
| } |
| prev_state = state; |
| start_cpu = i; |
| } |
| } |
| /* print the trailing cpus, ignoring them if they are all offline */ |
| if (prev_state != 'F') { |
| if (!first_print) |
| kdb_printf(", "); |
| kdb_printf("%d", start_cpu); |
| if (start_cpu < i-1) |
| kdb_printf("-%d", i-1); |
| if (prev_state != ' ') |
| kdb_printf("(%c)", prev_state); |
| } |
| kdb_printf("\n"); |
| } |
| |
| static int kdb_cpu(int argc, const char **argv) |
| { |
| unsigned long cpunum; |
| int diag; |
| |
| if (argc == 0) { |
| kdb_cpu_status(); |
| return 0; |
| } |
| |
| if (argc != 1) |
| return KDB_ARGCOUNT; |
| |
| diag = kdbgetularg(argv[1], &cpunum); |
| if (diag) |
| return diag; |
| |
| /* |
| * Validate cpunum |
| */ |
| if ((cpunum > NR_CPUS) || !cpu_online(cpunum)) |
| return KDB_BADCPUNUM; |
| |
| dbg_switch_cpu = cpunum; |
| |
| /* |
| * Switch to other cpu |
| */ |
| return KDB_CMD_CPU; |
| } |
| |
| /* The user may not realize that ps/bta with no parameters does not print idle |
| * or sleeping system daemon processes, so tell them how many were suppressed. |
| */ |
| void kdb_ps_suppressed(void) |
| { |
| int idle = 0, daemon = 0; |
| unsigned long mask_I = kdb_task_state_string("I"), |
| mask_M = kdb_task_state_string("M"); |
| unsigned long cpu; |
| const struct task_struct *p, *g; |
| for_each_online_cpu(cpu) { |
| p = kdb_curr_task(cpu); |
| if (kdb_task_state(p, mask_I)) |
| ++idle; |
| } |
| kdb_do_each_thread(g, p) { |
| if (kdb_task_state(p, mask_M)) |
| ++daemon; |
| } kdb_while_each_thread(g, p); |
| if (idle || daemon) { |
| if (idle) |
| kdb_printf("%d idle process%s (state I)%s\n", |
| idle, idle == 1 ? "" : "es", |
| daemon ? " and " : ""); |
| if (daemon) |
| kdb_printf("%d sleeping system daemon (state M) " |
| "process%s", daemon, |
| daemon == 1 ? "" : "es"); |
| kdb_printf(" suppressed,\nuse 'ps A' to see all.\n"); |
| } |
| } |
| |
| /* |
| * kdb_ps - This function implements the 'ps' command which shows a |
| * list of the active processes. |
| * ps [DRSTCZEUIMA] All processes, optionally filtered by state |
| */ |
| void kdb_ps1(const struct task_struct *p) |
| { |
| int cpu; |
| unsigned long tmp; |
| |
| if (!p || probe_kernel_read(&tmp, (char *)p, sizeof(unsigned long))) |
| return; |
| |
| cpu = kdb_process_cpu(p); |
| kdb_printf("0x%p %8d %8d %d %4d %c 0x%p %c%s\n", |
| (void *)p, p->pid, p->parent->pid, |
| kdb_task_has_cpu(p), kdb_process_cpu(p), |
| kdb_task_state_char(p), |
| (void *)(&p->thread), |
| p == kdb_curr_task(raw_smp_processor_id()) ? '*' : ' ', |
| p->comm); |
| if (kdb_task_has_cpu(p)) { |
| if (!KDB_TSK(cpu)) { |
| kdb_printf(" Error: no saved data for this cpu\n"); |
| } else { |
| if (KDB_TSK(cpu) != p) |
| kdb_printf(" Error: does not match running " |
| "process table (0x%p)\n", KDB_TSK(cpu)); |
| } |
| } |
| } |
| |
| static int kdb_ps(int argc, const char **argv) |
| { |
| struct task_struct *g, *p; |
| unsigned long mask, cpu; |
| |
| if (argc == 0) |
| kdb_ps_suppressed(); |
| kdb_printf("%-*s Pid Parent [*] cpu State %-*s Command\n", |
| (int)(2*sizeof(void *))+2, "Task Addr", |
| (int)(2*sizeof(void *))+2, "Thread"); |
| mask = kdb_task_state_string(argc ? argv[1] : NULL); |
| /* Run the active tasks first */ |
| for_each_online_cpu(cpu) { |
| if (KDB_FLAG(CMD_INTERRUPT)) |
| return 0; |
| p = kdb_curr_task(cpu); |
| if (kdb_task_state(p, mask)) |
| kdb_ps1(p); |
| } |
| kdb_printf("\n"); |
| /* Now the real tasks */ |
| kdb_do_each_thread(g, p) { |
| if (KDB_FLAG(CMD_INTERRUPT)) |
| return 0; |
| if (kdb_task_state(p, mask)) |
| kdb_ps1(p); |
| } kdb_while_each_thread(g, p); |
| |
| return 0; |
| } |
| |
| /* |
| * kdb_pid - This function implements the 'pid' command which switches |
| * the currently active process. |
| * pid [<pid> | R] |
| */ |
| static int kdb_pid(int argc, const char **argv) |
| { |
| struct task_struct *p; |
| unsigned long val; |
| int diag; |
| |
| if (argc > 1) |
| return KDB_ARGCOUNT; |
| |
| if (argc) { |
| if (strcmp(argv[1], "R") == 0) { |
| p = KDB_TSK(kdb_initial_cpu); |
| } else { |
| diag = kdbgetularg(argv[1], &val); |
| if (diag) |
| return KDB_BADINT; |
| |
| p = find_task_by_pid_ns((pid_t)val, &init_pid_ns); |
| if (!p) { |
| kdb_printf("No task with pid=%d\n", (pid_t)val); |
| return 0; |
| } |
| } |
| kdb_set_current_task(p); |
| } |
| kdb_printf("KDB current process is %s(pid=%d)\n", |
| kdb_current_task->comm, |
| kdb_current_task->pid); |
| |
| return 0; |
| } |
| |
| /* |
| * kdb_ll - This function implements the 'll' command which follows a |
| * linked list and executes an arbitrary command for each |
| * element. |
| */ |
| static int kdb_ll(int argc, const char **argv) |
| { |
| int diag; |
| unsigned long addr; |
| long offset = 0; |
| unsigned long va; |
| unsigned long linkoffset; |
| int nextarg; |
| const char *command; |
| |
| if (argc != 3) |
| return KDB_ARGCOUNT; |
| |
| nextarg = 1; |
| diag = kdbgetaddrarg(argc, argv, &nextarg, &addr, &offset, NULL); |
| if (diag) |
| return diag; |
| |
| diag = kdbgetularg(argv[2], &linkoffset); |
| if (diag) |
| return diag; |
| |
| /* |
| * Using the starting address as |
| * the first element in the list, and assuming that |
| * the list ends with a null pointer. |
| */ |
| |
| va = addr; |
| command = kdb_strdup(argv[3], GFP_KDB); |
| if (!command) { |
| kdb_printf("%s: cannot duplicate command\n", __func__); |
| return 0; |
| } |
| /* Recursive use of kdb_parse, do not use argv after this point */ |
| argv = NULL; |
| |
| while (va) { |
| char buf[80]; |
| |
| sprintf(buf, "%s " kdb_machreg_fmt "\n", command, va); |
| diag = kdb_parse(buf); |
| if (diag) |
| return diag; |
| |
| addr = va + linkoffset; |
| if (kdb_getword(&va, addr, sizeof(va))) |
| return 0; |
| } |
| kfree(command); |
| |
| return 0; |
| } |
| |
| static int kdb_kgdb(int argc, const char **argv) |
| { |
| return KDB_CMD_KGDB; |
| } |
| |
| /* |
| * kdb_help - This function implements the 'help' and '?' commands. |
| */ |
| static int kdb_help(int argc, const char **argv) |
| { |
| kdbtab_t *kt; |
| int i; |
| |
| kdb_printf("%-15.15s %-20.20s %s\n", "Command", "Usage", "Description"); |
| kdb_printf("-----------------------------" |
| "-----------------------------\n"); |
| for_each_kdbcmd(kt, i) { |
| if (kt->cmd_name) |
| kdb_printf("%-15.15s %-20.20s %s\n", kt->cmd_name, |
| kt->cmd_usage, kt->cmd_help); |
| if (KDB_FLAG(CMD_INTERRUPT)) |
| return 0; |
| } |
| return 0; |
| } |
| |
| /* |
| * kdb_kill - This function implements the 'kill' commands. |
| */ |
| static int kdb_kill(int argc, const char **argv) |
| { |
| long sig, pid; |
| char *endp; |
| struct task_struct *p; |
| struct siginfo info; |
| |
| if (argc != 2) |
| return KDB_ARGCOUNT; |
| |
| sig = simple_strtol(argv[1], &endp, 0); |
| if (*endp) |
| return KDB_BADINT; |
| if (sig >= 0) { |
| kdb_printf("Invalid signal parameter.<-signal>\n"); |
| return 0; |
| } |
| sig = -sig; |
| |
| pid = simple_strtol(argv[2], &endp, 0); |
| if (*endp) |
| return KDB_BADINT; |
| if (pid <= 0) { |
| kdb_printf("Process ID must be large than 0.\n"); |
| return 0; |
| } |
| |
| /* Find the process. */ |
| p = find_task_by_pid_ns(pid, &init_pid_ns); |
| if (!p) { |
| kdb_printf("The specified process isn't found.\n"); |
| return 0; |
| } |
| p = p->group_leader; |
| info.si_signo = sig; |
| info.si_errno = 0; |
| info.si_code = SI_USER; |
| info.si_pid = pid; /* same capabilities as process being signalled */ |
| info.si_uid = 0; /* kdb has root authority */ |
| kdb_send_sig_info(p, &info); |
| return 0; |
| } |
| |
| struct kdb_tm { |
| int tm_sec; /* seconds */ |
| int tm_min; /* minutes */ |
| int tm_hour; /* hours */ |
| int tm_mday; /* day of the month */ |
| int tm_mon; /* month */ |
| int tm_year; /* year */ |
| }; |
| |
| static void kdb_gmtime(struct timespec *tv, struct kdb_tm *tm) |
| { |
| /* This will work from 1970-2099, 2100 is not a leap year */ |
| static int mon_day[] = { 31, 29, 31, 30, 31, 30, 31, |
| 31, 30, 31, 30, 31 }; |
| memset(tm, 0, sizeof(*tm)); |
| tm->tm_sec = tv->tv_sec % (24 * 60 * 60); |
| tm->tm_mday = tv->tv_sec / (24 * 60 * 60) + |
| (2 * 365 + 1); /* shift base from 1970 to 1968 */ |
| tm->tm_min = tm->tm_sec / 60 % 60; |
| tm->tm_hour = tm->tm_sec / 60 / 60; |
| tm->tm_sec = tm->tm_sec % 60; |
| tm->tm_year = 68 + 4*(tm->tm_mday / (4*365+1)); |
| tm->tm_mday %= (4*365+1); |
| mon_day[1] = 29; |
| while (tm->tm_mday >= mon_day[tm->tm_mon]) { |
| tm->tm_mday -= mon_day[tm->tm_mon]; |
| if (++tm->tm_mon == 12) { |
| tm->tm_mon = 0; |
| ++tm->tm_year; |
| mon_day[1] = 28; |
| } |
| } |
| ++tm->tm_mday; |
| } |
| |
| /* |
| * Most of this code has been lifted from kernel/timer.c::sys_sysinfo(). |
| * I cannot call that code directly from kdb, it has an unconditional |
| * cli()/sti() and calls routines that take locks which can stop the debugger. |
| */ |
| static void kdb_sysinfo(struct sysinfo *val) |
| { |
| struct timespec uptime; |
| do_posix_clock_monotonic_gettime(&uptime); |
| memset(val, 0, sizeof(*val)); |
| val->uptime = uptime.tv_sec; |
| val->loads[0] = avenrun[0]; |
| val->loads[1] = avenrun[1]; |
| val->loads[2] = avenrun[2]; |
| val->procs = nr_threads-1; |
| si_meminfo(val); |
| |
| return; |
| } |
| |
| /* |
| * kdb_summary - This function implements the 'summary' command. |
| */ |
| static int kdb_summary(int argc, const char **argv) |
| { |
| struct kdb_tm tm; |
| struct sysinfo val; |
| |
| if (argc) |
| return KDB_ARGCOUNT; |
| |
| kdb_printf("sysname %s\n", init_uts_ns.name.sysname); |
| kdb_printf("release %s\n", init_uts_ns.name.release); |
| kdb_printf("version %s\n", init_uts_ns.name.version); |
| kdb_printf("machine %s\n", init_uts_ns.name.machine); |
| kdb_printf("nodename %s\n", init_uts_ns.name.nodename); |
| kdb_printf("domainname %s\n", init_uts_ns.name.domainname); |
| kdb_printf("ccversion %s\n", __stringify(CCVERSION)); |
| |
| kdb_gmtime(&xtime, &tm); |
| kdb_printf("date %04d-%02d-%02d %02d:%02d:%02d " |
| "tz_minuteswest %d\n", |
| 1900+tm.tm_year, tm.tm_mon+1, tm.tm_mday, |
| tm.tm_hour, tm.tm_min, tm.tm_sec, |
| sys_tz.tz_minuteswest); |
| |
| kdb_sysinfo(&val); |
| kdb_printf("uptime "); |
| if (val.uptime > (24*60*60)) { |
| int days = val.uptime / (24*60*60); |
| val.uptime %= (24*60*60); |
| kdb_printf("%d day%s ", days, days == 1 ? "" : "s"); |
| } |
| kdb_printf("%02ld:%02ld\n", val.uptime/(60*60), (val.uptime/60)%60); |
| |
| /* lifted from fs/proc/proc_misc.c::loadavg_read_proc() */ |
| |
| #define LOAD_INT(x) ((x) >> FSHIFT) |
| #define LOAD_FRAC(x) LOAD_INT(((x) & (FIXED_1-1)) * 100) |
| kdb_printf("load avg %ld.%02ld %ld.%02ld %ld.%02ld\n", |
| LOAD_INT(val.loads[0]), LOAD_FRAC(val.loads[0]), |
| LOAD_INT(val.loads[1]), LOAD_FRAC(val.loads[1]), |
| LOAD_INT(val.loads[2]), LOAD_FRAC(val.loads[2])); |
| #undef LOAD_INT |
| #undef LOAD_FRAC |
| /* Display in kilobytes */ |
| #define K(x) ((x) << (PAGE_SHIFT - 10)) |
| kdb_printf("\nMemTotal: %8lu kB\nMemFree: %8lu kB\n" |
| "Buffers: %8lu kB\n", |
| val.totalram, val.freeram, val.bufferram); |
| return 0; |
| } |
| |
| /* |
| * kdb_per_cpu - This function implements the 'per_cpu' command. |
| */ |
| static int kdb_per_cpu(int argc, const char **argv) |
| { |
| char buf[256], fmtstr[64]; |
| kdb_symtab_t symtab; |
| cpumask_t suppress = CPU_MASK_NONE; |
| int cpu, diag; |
| unsigned long addr, val, bytesperword = 0, whichcpu = ~0UL; |
| |
| if (argc < 1 || argc > 3) |
| return KDB_ARGCOUNT; |
| |
| snprintf(buf, sizeof(buf), "per_cpu__%s", argv[1]); |
| if (!kdbgetsymval(buf, &symtab)) { |
| kdb_printf("%s is not a per_cpu variable\n", argv[1]); |
| return KDB_BADADDR; |
| } |
| if (argc >= 2) { |
| diag = kdbgetularg(argv[2], &bytesperword); |
| if (diag) |
| return diag; |
| } |
| if (!bytesperword) |
| bytesperword = KDB_WORD_SIZE; |
| else if (bytesperword > KDB_WORD_SIZE) |
| return KDB_BADWIDTH; |
| sprintf(fmtstr, "%%0%dlx ", (int)(2*bytesperword)); |
| if (argc >= 3) { |
| diag = kdbgetularg(argv[3], &whichcpu); |
| if (diag) |
| return diag; |
| if (!cpu_online(whichcpu)) { |
| kdb_printf("cpu %ld is not online\n", whichcpu); |
| return KDB_BADCPUNUM; |
| } |
| } |
| |
| /* Most architectures use __per_cpu_offset[cpu], some use |
| * __per_cpu_offset(cpu), smp has no __per_cpu_offset. |
| */ |
| #ifdef __per_cpu_offset |
| #define KDB_PCU(cpu) __per_cpu_offset(cpu) |
| #else |
| #ifdef CONFIG_SMP |
| #define KDB_PCU(cpu) __per_cpu_offset[cpu] |
| #else |
| #define KDB_PCU(cpu) 0 |
| #endif |
| #endif |
| |
| for_each_online_cpu(cpu) { |
| if (whichcpu != ~0UL && whichcpu != cpu) |
| continue; |
| addr = symtab.sym_start + KDB_PCU(cpu); |
| diag = kdb_getword(&val, addr, bytesperword); |
| if (diag) { |
| kdb_printf("%5d " kdb_bfd_vma_fmt0 " - unable to " |
| "read, diag=%d\n", cpu, addr, diag); |
| continue; |
| } |
| #ifdef CONFIG_SMP |
| if (!val) { |
| cpu_set(cpu, suppress); |
| continue; |
| } |
| #endif /* CONFIG_SMP */ |
| kdb_printf("%5d ", cpu); |
| kdb_md_line(fmtstr, addr, |
| bytesperword == KDB_WORD_SIZE, |
| 1, bytesperword, 1, 1, 0); |
| } |
| if (cpus_weight(suppress) == 0) |
| return 0; |
| kdb_printf("Zero suppressed cpu(s):"); |
| for (cpu = first_cpu(suppress); cpu < num_possible_cpus(); |
| cpu = next_cpu(cpu, suppress)) { |
| kdb_printf(" %d", cpu); |
| if (cpu == num_possible_cpus() - 1 || |
| next_cpu(cpu, suppress) != cpu + 1) |
| continue; |
| while (cpu < num_possible_cpus() && |
| next_cpu(cpu, suppress) == cpu + 1) |
| ++cpu; |
| kdb_printf("-%d", cpu); |
| } |
| kdb_printf("\n"); |
| |
| #undef KDB_PCU |
| |
| return 0; |
| } |
| |
| /* |
| * display help for the use of cmd | grep pattern |
| */ |
| static int kdb_grep_help(int argc, const char **argv) |
| { |
| kdb_printf("Usage of cmd args | grep pattern:\n"); |
| kdb_printf(" Any command's output may be filtered through an "); |
| kdb_printf("emulated 'pipe'.\n"); |
| kdb_printf(" 'grep' is just a key word.\n"); |
| kdb_printf(" The pattern may include a very limited set of " |
| "metacharacters:\n"); |
| kdb_printf(" pattern or ^pattern or pattern$ or ^pattern$\n"); |
| kdb_printf(" And if there are spaces in the pattern, you may " |
| "quote it:\n"); |
| kdb_printf(" \"pat tern\" or \"^pat tern\" or \"pat tern$\"" |
| " or \"^pat tern$\"\n"); |
| return 0; |
| } |
| |
| /* |
| * kdb_register_repeat - This function is used to register a kernel |
| * debugger command. |
| * Inputs: |
| * cmd Command name |
| * func Function to execute the command |
| * usage A simple usage string showing arguments |
| * help A simple help string describing command |
| * repeat Does the command auto repeat on enter? |
| * Returns: |
| * zero for success, one if a duplicate command. |
| */ |
| #define kdb_command_extend 50 /* arbitrary */ |
| int kdb_register_repeat(char *cmd, |
| kdb_func_t func, |
| char *usage, |
| char *help, |
| short minlen, |
| kdb_repeat_t repeat) |
| { |
| int i; |
| kdbtab_t *kp; |
| |
| /* |
| * Brute force method to determine duplicates |
| */ |
| for_each_kdbcmd(kp, i) { |
| if (kp->cmd_name && (strcmp(kp->cmd_name, cmd) == 0)) { |
| kdb_printf("Duplicate kdb command registered: " |
| "%s, func %p help %s\n", cmd, func, help); |
| return 1; |
| } |
| } |
| |
| /* |
| * Insert command into first available location in table |
| */ |
| for_each_kdbcmd(kp, i) { |
| if (kp->cmd_name == NULL) |
| break; |
| } |
| |
| if (i >= kdb_max_commands) { |
| kdbtab_t *new = kmalloc((kdb_max_commands - KDB_BASE_CMD_MAX + |
| kdb_command_extend) * sizeof(*new), GFP_KDB); |
| if (!new) { |
| kdb_printf("Could not allocate new kdb_command " |
| "table\n"); |
| return 1; |
| } |
| if (kdb_commands) { |
| memcpy(new, kdb_commands, |
| kdb_max_commands * sizeof(*new)); |
| kfree(kdb_commands); |
| } |
| memset(new + kdb_max_commands, 0, |
| kdb_command_extend * sizeof(*new)); |
| kdb_commands = new; |
| kp = kdb_commands + kdb_max_commands; |
| kdb_max_commands += kdb_command_extend; |
| } |
| |
| kp->cmd_name = cmd; |
| kp->cmd_func = func; |
| kp->cmd_usage = usage; |
| kp->cmd_help = help; |
| kp->cmd_flags = 0; |
| kp->cmd_minlen = minlen; |
| kp->cmd_repeat = repeat; |
| |
| return 0; |
| } |
| |
| /* |
| * kdb_register - Compatibility register function for commands that do |
| * not need to specify a repeat state. Equivalent to |
| * kdb_register_repeat with KDB_REPEAT_NONE. |
| * Inputs: |
| * cmd Command name |
| * func Function to execute the command |
| * usage A simple usage string showing arguments |
| * help A simple help string describing command |
| * Returns: |
| * zero for success, one if a duplicate command. |
| */ |
| int kdb_register(char *cmd, |
| kdb_func_t func, |
| char *usage, |
| char *help, |
| short minlen) |
| { |
| return kdb_register_repeat(cmd, func, usage, help, minlen, |
| KDB_REPEAT_NONE); |
| } |
| |
| /* |
| * kdb_unregister - This function is used to unregister a kernel |
| * debugger command. It is generally called when a module which |
| * implements kdb commands is unloaded. |
| * Inputs: |
| * cmd Command name |
| * Returns: |
| * zero for success, one command not registered. |
| */ |
| int kdb_unregister(char *cmd) |
| { |
| int i; |
| kdbtab_t *kp; |
| |
| /* |
| * find the command. |
| */ |
| for (i = 0, kp = kdb_commands; i < kdb_max_commands; i++, kp++) { |
| if (kp->cmd_name && (strcmp(kp->cmd_name, cmd) == 0)) { |
| kp->cmd_name = NULL; |
| return 0; |
| } |
| } |
| |
| /* Couldn't find it. */ |
| return 1; |
| } |
| |
| /* Initialize the kdb command table. */ |
| static void __init kdb_inittab(void) |
| { |
| int i; |
| kdbtab_t *kp; |
| |
| for_each_kdbcmd(kp, i) |
| kp->cmd_name = NULL; |
| |
| kdb_register_repeat("md", kdb_md, "<vaddr>", |
| "Display Memory Contents, also mdWcN, e.g. md8c1", 1, |
| KDB_REPEAT_NO_ARGS); |
| kdb_register_repeat("mdr", kdb_md, "<vaddr> <bytes>", |
| "Display Raw Memory", 0, KDB_REPEAT_NO_ARGS); |
| kdb_register_repeat("mdp", kdb_md, "<paddr> <bytes>", |
| "Display Physical Memory", 0, KDB_REPEAT_NO_ARGS); |
| kdb_register_repeat("mds", kdb_md, "<vaddr>", |
| "Display Memory Symbolically", 0, KDB_REPEAT_NO_ARGS); |
| kdb_register_repeat("mm", kdb_mm, "<vaddr> <contents>", |
| "Modify Memory Contents", 0, KDB_REPEAT_NO_ARGS); |
| kdb_register_repeat("go", kdb_go, "[<vaddr>]", |
| "Continue Execution", 1, KDB_REPEAT_NONE); |
| kdb_register_repeat("rd", kdb_rd, "", |
| "Display Registers", 0, KDB_REPEAT_NONE); |
| kdb_register_repeat("rm", kdb_rm, "<reg> <contents>", |
| "Modify Registers", 0, KDB_REPEAT_NONE); |
| kdb_register_repeat("ef", kdb_ef, "<vaddr>", |
| "Display exception frame", 0, KDB_REPEAT_NONE); |
| kdb_register_repeat("bt", kdb_bt, "[<vaddr>]", |
| "Stack traceback", 1, KDB_REPEAT_NONE); |
| kdb_register_repeat("btp", kdb_bt, "<pid>", |
| "Display stack for process <pid>", 0, KDB_REPEAT_NONE); |
| kdb_register_repeat("bta", kdb_bt, "[DRSTCZEUIMA]", |
| "Display stack all processes", 0, KDB_REPEAT_NONE); |
| kdb_register_repeat("btc", kdb_bt, "", |
| "Backtrace current process on each cpu", 0, KDB_REPEAT_NONE); |
| kdb_register_repeat("btt", kdb_bt, "<vaddr>", |
| "Backtrace process given its struct task address", 0, |
| KDB_REPEAT_NONE); |
| kdb_register_repeat("ll", kdb_ll, "<first-element> <linkoffset> <cmd>", |
| "Execute cmd for each element in linked list", 0, KDB_REPEAT_NONE); |
| kdb_register_repeat("env", kdb_env, "", |
| "Show environment variables", 0, KDB_REPEAT_NONE); |
| kdb_register_repeat("set", kdb_set, "", |
| "Set environment variables", 0, KDB_REPEAT_NONE); |
| kdb_register_repeat("help", kdb_help, "", |
| "Display Help Message", 1, KDB_REPEAT_NONE); |
| kdb_register_repeat("?", kdb_help, "", |
| "Display Help Message", 0, KDB_REPEAT_NONE); |
| kdb_register_repeat("cpu", kdb_cpu, "<cpunum>", |
| "Switch to new cpu", 0, KDB_REPEAT_NONE); |
| kdb_register_repeat("kgdb", kdb_kgdb, "", |
| "Enter kgdb mode", 0, KDB_REPEAT_NONE); |
| kdb_register_repeat("ps", kdb_ps, "[<flags>|A]", |
| "Display active task list", 0, KDB_REPEAT_NONE); |
| kdb_register_repeat("pid", kdb_pid, "<pidnum>", |
| "Switch to another task", 0, KDB_REPEAT_NONE); |
| kdb_register_repeat("reboot", kdb_reboot, "", |
| "Reboot the machine immediately", 0, KDB_REPEAT_NONE); |
| #if defined(CONFIG_MODULES) |
| kdb_register_repeat("lsmod", kdb_lsmod, "", |
| "List loaded kernel modules", 0, KDB_REPEAT_NONE); |
| #endif |
| #if defined(CONFIG_MAGIC_SYSRQ) |
| kdb_register_repeat("sr", kdb_sr, "<key>", |
| "Magic SysRq key", 0, KDB_REPEAT_NONE); |
| #endif |
| #if defined(CONFIG_PRINTK) |
| kdb_register_repeat("dmesg", kdb_dmesg, "[lines]", |
| "Display syslog buffer", 0, KDB_REPEAT_NONE); |
| #endif |
| kdb_register_repeat("defcmd", kdb_defcmd, "name \"usage\" \"help\"", |
| "Define a set of commands, down to endefcmd", 0, KDB_REPEAT_NONE); |
| kdb_register_repeat("kill", kdb_kill, "<-signal> <pid>", |
| "Send a signal to a process", 0, KDB_REPEAT_NONE); |
| kdb_register_repeat("summary", kdb_summary, "", |
| "Summarize the system", 4, KDB_REPEAT_NONE); |
| kdb_register_repeat("per_cpu", kdb_per_cpu, "", |
| "Display per_cpu variables", 3, KDB_REPEAT_NONE); |
| kdb_register_repeat("grephelp", kdb_grep_help, "", |
| "Display help on | grep", 0, KDB_REPEAT_NONE); |
| } |
| |
| /* Execute any commands defined in kdb_cmds. */ |
| static void __init kdb_cmd_init(void) |
| { |
| int i, diag; |
| for (i = 0; kdb_cmds[i]; ++i) { |
| diag = kdb_parse(kdb_cmds[i]); |
| if (diag) |
| kdb_printf("kdb command %s failed, kdb diag %d\n", |
| kdb_cmds[i], diag); |
| } |
| if (defcmd_in_progress) { |
| kdb_printf("Incomplete 'defcmd' set, forcing endefcmd\n"); |
| kdb_parse("endefcmd"); |
| } |
| } |
| |
| /* Intialize kdb_printf, breakpoint tables and kdb state */ |
| void __init kdb_init(int lvl) |
| { |
| static int kdb_init_lvl = KDB_NOT_INITIALIZED; |
| int i; |
| |
| if (kdb_init_lvl == KDB_INIT_FULL || lvl <= kdb_init_lvl) |
| return; |
| for (i = kdb_init_lvl; i < lvl; i++) { |
| switch (i) { |
| case KDB_NOT_INITIALIZED: |
| kdb_inittab(); /* Initialize Command Table */ |
| kdb_initbptab(); /* Initialize Breakpoints */ |
| break; |
| case KDB_INIT_EARLY: |
| kdb_cmd_init(); /* Build kdb_cmds tables */ |
| break; |
| } |
| } |
| kdb_init_lvl = lvl; |
| } |