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-rw-r--r--kernel/debug/kdb/kdb_main.c2937
1 files changed, 2937 insertions, 0 deletions
diff --git a/kernel/debug/kdb/kdb_main.c b/kernel/debug/kdb/kdb_main.c
new file mode 100644
index 0000000000..35aa2e98a9
--- /dev/null
+++ b/kernel/debug/kdb/kdb_main.c
@@ -0,0 +1,2937 @@
+/*
+ * 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/types.h>
+#include <linux/string.h>
+#include <linux/kernel.h>
+#include <linux/kmsg_dump.h>
+#include <linux/reboot.h>
+#include <linux/sched.h>
+#include <linux/sched/loadavg.h>
+#include <linux/sched/stat.h>
+#include <linux/sched/debug.h>
+#include <linux/sysrq.h>
+#include <linux/smp.h>
+#include <linux/utsname.h>
+#include <linux/vmalloc.h>
+#include <linux/atomic.h>
+#include <linux/moduleparam.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 <linux/security.h>
+#include "kdb_private.h"
+
+#undef MODULE_PARAM_PREFIX
+#define MODULE_PARAM_PREFIX "kdb."
+
+static int kdb_cmd_enabled = CONFIG_KDB_DEFAULT_ENABLE;
+module_param_named(cmd_enable, kdb_cmd_enabled, int, 0600);
+
+char kdb_grep_string[KDB_GREP_STRLEN];
+int kdb_grepping_flag;
+EXPORT_SYMBOL(kdb_grepping_flag);
+int kdb_grep_leading;
+int kdb_grep_trailing;
+
+/*
+ * Kernel debugger state flags
+ */
+unsigned int kdb_flags;
+
+/*
+ * 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;
+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_cmds_head describes the available commands. */
+static LIST_HEAD(kdb_cmds_head);
+
+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"),
+ KDBMSG(NOPERM, "Permission denied"),
+};
+#undef KDBMSG
+
+static const int __nkdb_err = ARRAY_SIZE(kdbmsgs);
+
+
+/*
+ * 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[31] = {
+#if defined(CONFIG_SMP)
+ "PROMPT=[%d]kdb> ",
+#else
+ "PROMPT=kdb> ",
+#endif
+ "MOREPROMPT=more> ",
+ "RADIX=16",
+ "MDCOUNT=8", /* lines of md output */
+ KDB_PLATFORM_ENV,
+ "DTABCOUNT=30",
+ "NOSECT=1",
+};
+
+static const int __nenv = ARRAY_SIZE(__env);
+
+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;
+}
+
+/*
+ * Update the permissions flags (kdb_cmd_enabled) to match the
+ * current lockdown state.
+ *
+ * Within this function the calls to security_locked_down() are "lazy". We
+ * avoid calling them if the current value of kdb_cmd_enabled already excludes
+ * flags that might be subject to lockdown. Additionally we deliberately check
+ * the lockdown flags independently (even though read lockdown implies write
+ * lockdown) since that results in both simpler code and clearer messages to
+ * the user on first-time debugger entry.
+ *
+ * The permission masks during a read+write lockdown permits the following
+ * flags: INSPECT, SIGNAL, REBOOT (and ALWAYS_SAFE).
+ *
+ * The INSPECT commands are not blocked during lockdown because they are
+ * not arbitrary memory reads. INSPECT covers the backtrace family (sometimes
+ * forcing them to have no arguments) and lsmod. These commands do expose
+ * some kernel state but do not allow the developer seated at the console to
+ * choose what state is reported. SIGNAL and REBOOT should not be controversial,
+ * given these are allowed for root during lockdown already.
+ */
+static void kdb_check_for_lockdown(void)
+{
+ const int write_flags = KDB_ENABLE_MEM_WRITE |
+ KDB_ENABLE_REG_WRITE |
+ KDB_ENABLE_FLOW_CTRL;
+ const int read_flags = KDB_ENABLE_MEM_READ |
+ KDB_ENABLE_REG_READ;
+
+ bool need_to_lockdown_write = false;
+ bool need_to_lockdown_read = false;
+
+ if (kdb_cmd_enabled & (KDB_ENABLE_ALL | write_flags))
+ need_to_lockdown_write =
+ security_locked_down(LOCKDOWN_DBG_WRITE_KERNEL);
+
+ if (kdb_cmd_enabled & (KDB_ENABLE_ALL | read_flags))
+ need_to_lockdown_read =
+ security_locked_down(LOCKDOWN_DBG_READ_KERNEL);
+
+ /* De-compose KDB_ENABLE_ALL if required */
+ if (need_to_lockdown_write || need_to_lockdown_read)
+ if (kdb_cmd_enabled & KDB_ENABLE_ALL)
+ kdb_cmd_enabled = KDB_ENABLE_MASK & ~KDB_ENABLE_ALL;
+
+ if (need_to_lockdown_write)
+ kdb_cmd_enabled &= ~write_flags;
+
+ if (need_to_lockdown_read)
+ kdb_cmd_enabled &= ~read_flags;
+}
+
+/*
+ * Check whether the flags of the current command, the permissions of the kdb
+ * console and the lockdown state allow a command to be run.
+ */
+static bool kdb_check_flags(kdb_cmdflags_t flags, int permissions,
+ bool no_args)
+{
+ /* permissions comes from userspace so needs massaging slightly */
+ permissions &= KDB_ENABLE_MASK;
+ permissions |= KDB_ENABLE_ALWAYS_SAFE;
+
+ /* some commands change group when launched with no arguments */
+ if (no_args)
+ permissions |= permissions << KDB_ENABLE_NO_ARGS_SHIFT;
+
+ flags |= KDB_ENABLE_ALL;
+
+ return permissions & flags;
+}
+
+/*
+ * 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 representation 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;
+}
+
+/*
+ * kdb_setenv() - Alter an existing environment variable or create a new one.
+ * @var: Name of the variable
+ * @val: Value of the variable
+ *
+ * Return: Zero on success, a kdb diagnostic on failure.
+ */
+static int kdb_setenv(const char *var, const char *val)
+{
+ int i;
+ char *ep;
+ size_t varlen, vallen;
+
+ varlen = strlen(var);
+ vallen = strlen(val);
+ ep = kdballocenv(varlen + vallen + 2);
+ if (ep == (char *)0)
+ return KDB_ENVBUFFULL;
+
+ sprintf(ep, "%s=%s", var, val);
+
+ for (i = 0; i < __nenv; i++) {
+ if (__env[i]
+ && ((strncmp(__env[i], var, 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;
+}
+
+/*
+ * kdb_printenv() - Display the current environment variables.
+ */
+static void kdb_printenv(void)
+{
+ int i;
+
+ for (i = 0; i < __nenv; i++) {
+ if (__env[i])
+ kdb_printf("%s\n", __env[i]);
+ }
+}
+
+/*
+ * 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 representation 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) {
+ /*
+ * Also 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;
+}
+
+int kdbgetu64arg(const char *arg, u64 *value)
+{
+ char *endp;
+ u64 val;
+
+ val = simple_strtoull(arg, &endp, 0);
+
+ if (endp == arg) {
+
+ val = simple_strtoull(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)
+{
+ /*
+ * 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;
+
+ /*
+ * Censor sensitive variables
+ */
+ if (strcmp(argv[1], "PROMPT") == 0 &&
+ !kdb_check_flags(KDB_ENABLE_MEM_READ, kdb_cmd_enabled, false))
+ return KDB_NOPERM;
+
+ /*
+ * 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(MASK))
+ | (debugflags << KDB_DEBUG_FLAG_SHIFT);
+
+ return 0;
+ }
+
+ /*
+ * Tokenizer squashed the '=' sign. argv[1] is variable
+ * name, argv[2] = value.
+ */
+ return kdb_setenv(argv[1], argv[2]);
+}
+
+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
+ * hexadecimal), a symbol name, a register name (preceded by the
+ * percent sign), an environment variable with a numeric value
+ * (preceded 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;
+
+ /*
+ * If the enable flags prohibit both arbitrary memory access
+ * and flow control then there are no reasonable grounds to
+ * provide symbol lookup.
+ */
+ if (!kdb_check_flags(KDB_ENABLE_MEM_READ | KDB_ENABLE_FLOW_CTRL,
+ kdb_cmd_enabled, false))
+ return KDB_NOPERM;
+
+ /*
+ * 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 kdb_macro {
+ kdbtab_t cmd; /* Macro command */
+ struct list_head statements; /* Associated statement list */
+};
+
+struct kdb_macro_statement {
+ char *statement; /* Statement text */
+ struct list_head list_node; /* Statement list node */
+};
+
+static struct kdb_macro *kdb_macro;
+static bool 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 kdb_macro_statement *kms;
+
+ if (!kdb_macro)
+ return KDB_NOTIMP;
+
+ if (strcmp(argv0, "endefcmd") == 0) {
+ defcmd_in_progress = false;
+ if (!list_empty(&kdb_macro->statements))
+ kdb_register(&kdb_macro->cmd);
+ return 0;
+ }
+
+ kms = kmalloc(sizeof(*kms), GFP_KDB);
+ if (!kms) {
+ kdb_printf("Could not allocate new kdb macro command: %s\n",
+ cmdstr);
+ return KDB_NOTIMP;
+ }
+
+ kms->statement = kdb_strdup(cmdstr, GFP_KDB);
+ list_add_tail(&kms->list_node, &kdb_macro->statements);
+
+ return 0;
+}
+
+static int kdb_defcmd(int argc, const char **argv)
+{
+ kdbtab_t *mp;
+
+ if (defcmd_in_progress) {
+ kdb_printf("kdb: nested defcmd detected, assuming missing "
+ "endefcmd\n");
+ kdb_defcmd2("endefcmd", "endefcmd");
+ }
+ if (argc == 0) {
+ kdbtab_t *kp;
+ struct kdb_macro *kmp;
+ struct kdb_macro_statement *kms;
+
+ list_for_each_entry(kp, &kdb_cmds_head, list_node) {
+ if (kp->func == kdb_exec_defcmd) {
+ kdb_printf("defcmd %s \"%s\" \"%s\"\n",
+ kp->name, kp->usage, kp->help);
+ kmp = container_of(kp, struct kdb_macro, cmd);
+ list_for_each_entry(kms, &kmp->statements,
+ list_node)
+ kdb_printf("%s", kms->statement);
+ kdb_printf("endefcmd\n");
+ }
+ }
+ return 0;
+ }
+ if (argc != 3)
+ return KDB_ARGCOUNT;
+ if (in_dbg_master()) {
+ kdb_printf("Command only available during kdb_init()\n");
+ return KDB_NOTIMP;
+ }
+ kdb_macro = kzalloc(sizeof(*kdb_macro), GFP_KDB);
+ if (!kdb_macro)
+ goto fail_defcmd;
+
+ mp = &kdb_macro->cmd;
+ mp->func = kdb_exec_defcmd;
+ mp->minlen = 0;
+ mp->flags = KDB_ENABLE_ALWAYS_SAFE;
+ mp->name = kdb_strdup(argv[1], GFP_KDB);
+ if (!mp->name)
+ goto fail_name;
+ mp->usage = kdb_strdup(argv[2], GFP_KDB);
+ if (!mp->usage)
+ goto fail_usage;
+ mp->help = kdb_strdup(argv[3], GFP_KDB);
+ if (!mp->help)
+ goto fail_help;
+ if (mp->usage[0] == '"') {
+ strcpy(mp->usage, argv[2]+1);
+ mp->usage[strlen(mp->usage)-1] = '\0';
+ }
+ if (mp->help[0] == '"') {
+ strcpy(mp->help, argv[3]+1);
+ mp->help[strlen(mp->help)-1] = '\0';
+ }
+
+ INIT_LIST_HEAD(&kdb_macro->statements);
+ defcmd_in_progress = true;
+ return 0;
+fail_help:
+ kfree(mp->usage);
+fail_usage:
+ kfree(mp->name);
+fail_name:
+ kfree(kdb_macro);
+fail_defcmd:
+ kdb_printf("Could not allocate new kdb_macro entry for %s\n", argv[1]);
+ return KDB_NOTIMP;
+}
+
+/*
+ * 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 ret;
+ kdbtab_t *kp;
+ struct kdb_macro *kmp;
+ struct kdb_macro_statement *kms;
+
+ if (argc != 0)
+ return KDB_ARGCOUNT;
+
+ list_for_each_entry(kp, &kdb_cmds_head, list_node) {
+ if (strcmp(kp->name, argv[0]) == 0)
+ break;
+ }
+ if (list_entry_is_head(kp, &kdb_cmds_head, list_node)) {
+ kdb_printf("kdb_exec_defcmd: could not find commands for %s\n",
+ argv[0]);
+ return KDB_NOTIMP;
+ }
+ kmp = container_of(kp, struct kdb_macro, cmd);
+ list_for_each_entry(kms, &kmp->statements, list_node) {
+ /*
+ * Recursive use of kdb_parse, do not use argv after this point.
+ */
+ argv = NULL;
+ kdb_printf("[%s]kdb> %s\n", kmp->cmd.name, kms->statement);
+ ret = kdb_parse(kms->statement);
+ 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 (!str_has_prefix(cp, "grep ")) {
+ 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 >= KDB_GREP_STRLEN) {
+ 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 delimiter (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 escaped, ignore_errors = 0, check_grep = 0;
+
+ /*
+ * First tokenize the command string.
+ */
+ cp = (char *)cmdstr;
+
+ 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];
+ }
+
+ list_for_each_entry(tp, &kdb_cmds_head, list_node) {
+ /*
+ * If this command is allowed to be abbreviated,
+ * check to see if this is it.
+ */
+ if (tp->minlen && (strlen(argv[0]) <= tp->minlen) &&
+ (strncmp(argv[0], tp->name, tp->minlen) == 0))
+ break;
+
+ if (strcmp(argv[0], tp->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 (list_entry_is_head(tp, &kdb_cmds_head, list_node)) {
+ list_for_each_entry(tp, &kdb_cmds_head, list_node) {
+ if (strncmp(argv[0], tp->name, strlen(tp->name)) == 0)
+ break;
+ }
+ }
+
+ if (!list_entry_is_head(tp, &kdb_cmds_head, list_node)) {
+ int result;
+
+ if (!kdb_check_flags(tp->flags, kdb_cmd_enabled, argc <= 1))
+ return KDB_NOPERM;
+
+ KDB_STATE_SET(CMD);
+ result = (*tp->func)(argc-1, (const char **)argv);
+ if (result && ignore_errors && result > KDB_CMD_GO)
+ result = 0;
+ KDB_STATE_CLEAR(CMD);
+
+ if (tp->flags & KDB_REPEAT_WITH_ARGS)
+ return result;
+
+ argc = tp->flags & KDB_REPEAT_NO_ARGS ? 1 : 0;
+ if (argv[argc])
+ *(argv[argc]) = '\0';
+ 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 + KDB_CMD_HISTORY_COUNT - 1) %
+ KDB_CMD_HISTORY_COUNT;
+ strscpy(cmd_cur, cmd_hist[cmdptr], CMD_BUFLEN);
+ return 1;
+ case CTRL_N:
+ if (cmdptr != cmd_head)
+ cmdptr = (cmdptr+1) % KDB_CMD_HISTORY_COUNT;
+ strscpy(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 = CONSOLE_LOGLEVEL_MOTORMOUTH;
+ kdb_trap_printk++;
+ show_regs(regs);
+ kdb_trap_printk--;
+ kdb_printf("\n");
+ console_loglevel = old_lvl;
+}
+
+static 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;
+}
+
+static void drop_newline(char *buf)
+{
+ size_t len = strlen(buf);
+
+ if (len == 0)
+ return;
+ if (*(buf + len - 1) == '\n')
+ *(buf + len - 1) = '\0';
+}
+
+/*
+ * 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.
+ */
+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_check_for_lockdown();
+
+ kdb_go_count = 0;
+ if (reason == KDB_REASON_DEBUG) {
+ /* special case below */
+ } else {
+ kdb_printf("\nEntering kdb (current=0x%px, pid %d) ",
+ kdb_current, kdb_current ? kdb_current->pid : 0);
+#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%px, 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_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_SYSTEM_NMI:
+ kdb_printf("due to System NonMaskable Interrupt\n");
+ break;
+ case KDB_REASON_NMI:
+ kdb_printf("due to NonMaskable Interrupt @ "
+ kdb_machreg_fmt "\n",
+ instruction_pointer(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);
+ kdb_grepping_flag = 0;
+ /* ensure the old search does not leak into '/' commands */
+ kdb_grep_string[0] = '\0';
+
+ cmdbuf = cmd_cur;
+ *cmdbuf = '\0';
+ *(cmd_hist[cmd_head]) = '\0';
+
+do_full_getstr:
+ /* PROMPT can only be set if we have MEM_READ permission. */
+ snprintf(kdb_prompt_str, CMD_BUFLEN, kdbgetenv("PROMPT"),
+ raw_smp_processor_id());
+
+ /*
+ * Fetch command from keyboard
+ */
+ cmdbuf = kdb_getstr(cmdbuf, CMD_BUFLEN, kdb_prompt_str);
+ if (*cmdbuf != '\n') {
+ if (*cmdbuf < 32) {
+ if (cmdptr == cmd_head) {
+ strscpy(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 {
+ strscpy(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) {
+ drop_newline(cmdbuf);
+ 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_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
+ * according 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_KGDB) {
+ if (!KDB_STATE(DOING_KGDB))
+ 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);
+
+ /* Clean up any keyboard devices before leaving */
+ kdb_kbd_cleanup_state();
+
+ 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;
+ int j;
+ 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 : '.'; })
+ for (j = 0; j < bytesperword; j++)
+ *c++ = printable_char(*cp++);
+ addr += bytesperword;
+#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;
+ int raw = 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 || (argc == 0 && last_addr != 0))
+ valid = raw = 1;
+ else
+ return KDB_ARGCOUNT;
+ } 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;
+ if (raw)
+ mdcount = repeat;
+ else
+ 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;
+ if (raw)
+ repeat = mdcount;
+ else
+ 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) {
+ int ret;
+ last_addr = addr;
+ ret = kdb_mdr(addr, mdcount);
+ last_addr += mdcount;
+ last_repeat = mdcount;
+ last_bytesperword = bytesperword; // to make REPEAT happy
+ return ret;
+ }
+
+ 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 (raw_smp_processor_id() != kdb_initial_cpu) {
+ kdb_printf("go must execute on the entry cpu, "
+ "please use \"cpu %d\" and then execute go\n",
+ kdb_initial_cpu);
+ return KDB_BADCPUNUM;
+ }
+ if (argc == 1) {
+ 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 len = kdb_check_regs();
+#if DBG_MAX_REG_NUM > 0
+ int i;
+ char *rname;
+ int rsize;
+ u64 reg64;
+ u32 reg32;
+ u16 reg16;
+ u8 reg8;
+
+ if (len)
+ return len;
+
+ for (i = 0; i < DBG_MAX_REG_NUM; i++) {
+ rsize = dbg_reg_def[i].size * 2;
+ if (rsize > 16)
+ rsize = 2;
+ if (len + strlen(dbg_reg_def[i].name) + 4 + rsize > 80) {
+ len = 0;
+ kdb_printf("\n");
+ }
+ if (len)
+ len += kdb_printf(" ");
+ switch(dbg_reg_def[i].size * 8) {
+ case 8:
+ rname = dbg_get_reg(i, &reg8, kdb_current_regs);
+ if (!rname)
+ break;
+ len += kdb_printf("%s: %02x", rname, reg8);
+ break;
+ case 16:
+ rname = dbg_get_reg(i, &reg16, kdb_current_regs);
+ if (!rname)
+ break;
+ len += kdb_printf("%s: %04x", rname, reg16);
+ break;
+ case 32:
+ rname = dbg_get_reg(i, &reg32, kdb_current_regs);
+ if (!rname)
+ break;
+ len += kdb_printf("%s: %08x", rname, reg32);
+ break;
+ case 64:
+ rname = dbg_get_reg(i, &reg64, kdb_current_regs);
+ if (!rname)
+ break;
+ len += kdb_printf("%s: %016llx", rname, reg64);
+ break;
+ default:
+ len += kdb_printf("%s: ??", dbg_reg_def[i].name);
+ }
+ }
+ kdb_printf("\n");
+#else
+ if (len)
+ return len;
+
+ kdb_dumpregs(kdb_current_regs);
+#endif
+ return 0;
+}
+
+/*
+ * kdb_rm - This function implements the 'rm' (register modify) command.
+ * rm register-name new-contents
+ * Remarks:
+ * Allows register modification with the same restrictions as gdb
+ */
+static int kdb_rm(int argc, const char **argv)
+{
+#if DBG_MAX_REG_NUM > 0
+ int diag;
+ const char *rname;
+ int i;
+ u64 reg64;
+ u32 reg32;
+ u16 reg16;
+ u8 reg8;
+
+ if (argc != 2)
+ return KDB_ARGCOUNT;
+ /*
+ * Allow presence or absence of leading '%' symbol.
+ */
+ rname = argv[1];
+ if (*rname == '%')
+ rname++;
+
+ diag = kdbgetu64arg(argv[2], &reg64);
+ if (diag)
+ return diag;
+
+ diag = kdb_check_regs();
+ if (diag)
+ return diag;
+
+ diag = KDB_BADREG;
+ for (i = 0; i < DBG_MAX_REG_NUM; i++) {
+ if (strcmp(rname, dbg_reg_def[i].name) == 0) {
+ diag = 0;
+ break;
+ }
+ }
+ if (!diag) {
+ switch(dbg_reg_def[i].size * 8) {
+ case 8:
+ reg8 = reg64;
+ dbg_set_reg(i, &reg8, kdb_current_regs);
+ break;
+ case 16:
+ reg16 = reg64;
+ dbg_set_reg(i, &reg16, kdb_current_regs);
+ break;
+ case 32:
+ reg32 = reg64;
+ dbg_set_reg(i, &reg32, kdb_current_regs);
+ break;
+ case 64:
+ dbg_set_reg(i, &reg64, kdb_current_regs);
+ break;
+ }
+ }
+ return diag;
+#else
+ kdb_printf("ERROR: Register set currently not implemented\n");
+ return 0;
+#endif
+}
+
+#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)
+{
+ bool check_mask =
+ !kdb_check_flags(KDB_ENABLE_ALL, kdb_cmd_enabled, false);
+
+ if (argc != 1)
+ return KDB_ARGCOUNT;
+
+ kdb_trap_printk++;
+ __handle_sysrq(*argv[1], check_mask);
+ 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;
+}
+
+/*
+ * kdb_env - This function implements the 'env' command. Display the
+ * current environment variables.
+ */
+
+static int kdb_env(int argc, const char **argv)
+{
+ kdb_printenv();
+
+ if (KDB_DEBUG(MASK))
+ kdb_printf("KDBDEBUG=0x%x\n",
+ (kdb_flags & KDB_DEBUG(MASK)) >> KDB_DEBUG_FLAG_SHIFT);
+
+ 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)
+{
+ int diag;
+ int logging;
+ int lines = 0;
+ int adjust = 0;
+ int n = 0;
+ int skip = 0;
+ struct kmsg_dump_iter iter;
+ size_t len;
+ char buf[201];
+
+ 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);
+ }
+
+ kmsg_dump_rewind(&iter);
+ while (kmsg_dump_get_line(&iter, 1, NULL, 0, NULL))
+ 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);
+ skip = adjust;
+ lines = abs(lines);
+ } else if (lines > 0) {
+ skip = n - lines - adjust;
+ lines = abs(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);
+ }
+ } else {
+ lines = n;
+ }
+
+ if (skip >= n || skip < 0)
+ return 0;
+
+ kmsg_dump_rewind(&iter);
+ while (kmsg_dump_get_line(&iter, 1, buf, sizeof(buf), &len)) {
+ if (skip) {
+ skip--;
+ continue;
+ }
+ if (!lines--)
+ break;
+ if (KDB_FLAG(CMD_INTERRUPT))
+ return 0;
+
+ kdb_printf("%.*s\n", (int)len - 1, buf);
+ }
+
+ return 0;
+}
+#endif /* CONFIG_PRINTK */
+
+/* Make sure we balance enable/disable calls, must disable first. */
+static atomic_t kdb_nmi_disabled;
+
+static int kdb_disable_nmi(int argc, const char *argv[])
+{
+ if (atomic_read(&kdb_nmi_disabled))
+ return 0;
+ atomic_set(&kdb_nmi_disabled, 1);
+ arch_kgdb_ops.enable_nmi(0);
+ return 0;
+}
+
+static int kdb_param_enable_nmi(const char *val, const struct kernel_param *kp)
+{
+ if (!atomic_add_unless(&kdb_nmi_disabled, -1, 0))
+ return -EINVAL;
+ arch_kgdb_ops.enable_nmi(1);
+ return 0;
+}
+
+static const struct kernel_param_ops kdb_param_ops_enable_nmi = {
+ .set = kdb_param_enable_nmi,
+};
+module_param_cb(enable_nmi, &kdb_param_ops_enable_nmi, NULL, 0600);
+
+/*
+ * 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 if (!kgdb_info[i].enter_kgdb) {
+ state = 'D'; /* cpu is online but unresponsive */
+ } else {
+ state = ' '; /* cpu is responding to kdb */
+ if (kdb_task_state_char(KDB_TSK(i)) == '-')
+ state = '-'; /* 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 >= CONFIG_NR_CPUS) || !kgdb_info[cpunum].enter_kgdb)
+ 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 cpu;
+ const struct task_struct *p, *g;
+ for_each_online_cpu(cpu) {
+ p = kdb_curr_task(cpu);
+ if (kdb_task_state(p, "-"))
+ ++idle;
+ }
+ for_each_process_thread(g, p) {
+ if (kdb_task_state(p, "ims"))
+ ++daemon;
+ }
+ if (idle || daemon) {
+ if (idle)
+ kdb_printf("%d idle process%s (state -)%s\n",
+ idle, idle == 1 ? "" : "es",
+ daemon ? " and " : "");
+ if (daemon)
+ kdb_printf("%d sleeping system daemon (state [ims]) "
+ "process%s", daemon,
+ daemon == 1 ? "" : "es");
+ kdb_printf(" suppressed,\nuse 'ps A' to see all.\n");
+ }
+}
+
+void kdb_ps1(const struct task_struct *p)
+{
+ int cpu;
+ unsigned long tmp;
+
+ if (!p ||
+ copy_from_kernel_nofault(&tmp, (char *)p, sizeof(unsigned long)))
+ return;
+
+ cpu = kdb_process_cpu(p);
+ kdb_printf("0x%px %8d %8d %d %4d %c 0x%px %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%px)\n", KDB_TSK(cpu));
+ }
+ }
+}
+
+/*
+ * kdb_ps - This function implements the 'ps' command which shows a
+ * list of the active processes.
+ *
+ * ps [<state_chars>] Show processes, optionally selecting only those whose
+ * state character is found in <state_chars>.
+ */
+static int kdb_ps(int argc, const char **argv)
+{
+ struct task_struct *g, *p;
+ const char *mask;
+ unsigned long 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 = argc ? argv[1] : kdbgetenv("PS");
+ /* 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 */
+ for_each_process_thread(g, p) {
+ if (KDB_FLAG(CMD_INTERRUPT))
+ return 0;
+ if (kdb_task_state(p, mask))
+ kdb_ps1(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;
+}
+
+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;
+
+ kdb_printf("%-15.15s %-20.20s %s\n", "Command", "Usage", "Description");
+ kdb_printf("-----------------------------"
+ "-----------------------------\n");
+ list_for_each_entry(kt, &kdb_cmds_head, list_node) {
+ char *space = "";
+ if (KDB_FLAG(CMD_INTERRUPT))
+ return 0;
+ if (!kdb_check_flags(kt->flags, kdb_cmd_enabled, true))
+ continue;
+ if (strlen(kt->usage) > 20)
+ space = "\n ";
+ kdb_printf("%-15.15s %-20s%s%s\n", kt->name,
+ kt->usage, space, kt->help);
+ }
+ 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;
+
+ if (argc != 2)
+ return KDB_ARGCOUNT;
+
+ sig = simple_strtol(argv[1], &endp, 0);
+ if (*endp)
+ return KDB_BADINT;
+ if ((sig >= 0) || !valid_signal(-sig)) {
+ 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;
+ kdb_send_sig(p, sig);
+ return 0;
+}
+
+/*
+ * 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)
+{
+ u64 uptime = ktime_get_mono_fast_ns();
+
+ memset(val, 0, sizeof(*val));
+ val->uptime = div_u64(uptime, NSEC_PER_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)
+{
+ time64_t now;
+ 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);
+
+ now = __ktime_get_real_seconds();
+ kdb_printf("date %ptTs tz_minuteswest %d\n", &now, 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);
+
+ 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]));
+
+ /* Display in kilobytes */
+#define K(x) ((x) << (PAGE_SHIFT - 10))
+ kdb_printf("\nMemTotal: %8lu kB\nMemFree: %8lu kB\n"
+ "Buffers: %8lu kB\n",
+ K(val.totalram), K(val.freeram), K(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 fmtstr[64];
+ int cpu, diag, nextarg = 1;
+ unsigned long addr, symaddr, val, bytesperword = 0, whichcpu = ~0UL;
+
+ if (argc < 1 || argc > 3)
+ return KDB_ARGCOUNT;
+
+ diag = kdbgetaddrarg(argc, argv, &nextarg, &symaddr, NULL, NULL);
+ if (diag)
+ return diag;
+
+ 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 (whichcpu >= nr_cpu_ids || !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 (KDB_FLAG(CMD_INTERRUPT))
+ return 0;
+
+ if (whichcpu != ~0UL && whichcpu != cpu)
+ continue;
+ addr = symaddr + 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;
+ }
+ kdb_printf("%5d ", cpu);
+ kdb_md_line(fmtstr, addr,
+ bytesperword == KDB_WORD_SIZE,
+ 1, bytesperword, 1, 1, 0);
+ }
+#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() - This function is used to register a kernel debugger
+ * command.
+ * @cmd: pointer to kdb command
+ *
+ * Note that it's the job of the caller to keep the memory for the cmd
+ * allocated until unregister is called.
+ */
+int kdb_register(kdbtab_t *cmd)
+{
+ kdbtab_t *kp;
+
+ list_for_each_entry(kp, &kdb_cmds_head, list_node) {
+ if (strcmp(kp->name, cmd->name) == 0) {
+ kdb_printf("Duplicate kdb cmd: %s, func %p help %s\n",
+ cmd->name, cmd->func, cmd->help);
+ return 1;
+ }
+ }
+
+ list_add_tail(&cmd->list_node, &kdb_cmds_head);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(kdb_register);
+
+/**
+ * kdb_register_table() - This function is used to register a kdb command
+ * table.
+ * @kp: pointer to kdb command table
+ * @len: length of kdb command table
+ */
+void kdb_register_table(kdbtab_t *kp, size_t len)
+{
+ while (len--) {
+ list_add_tail(&kp->list_node, &kdb_cmds_head);
+ kp++;
+ }
+}
+
+/**
+ * kdb_unregister() - This function is used to unregister a kernel debugger
+ * command. It is generally called when a module which
+ * implements kdb command is unloaded.
+ * @cmd: pointer to kdb command
+ */
+void kdb_unregister(kdbtab_t *cmd)
+{
+ list_del(&cmd->list_node);
+}
+EXPORT_SYMBOL_GPL(kdb_unregister);
+
+static kdbtab_t maintab[] = {
+ { .name = "md",
+ .func = kdb_md,
+ .usage = "<vaddr>",
+ .help = "Display Memory Contents, also mdWcN, e.g. md8c1",
+ .minlen = 1,
+ .flags = KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS,
+ },
+ { .name = "mdr",
+ .func = kdb_md,
+ .usage = "<vaddr> <bytes>",
+ .help = "Display Raw Memory",
+ .flags = KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS,
+ },
+ { .name = "mdp",
+ .func = kdb_md,
+ .usage = "<paddr> <bytes>",
+ .help = "Display Physical Memory",
+ .flags = KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS,
+ },
+ { .name = "mds",
+ .func = kdb_md,
+ .usage = "<vaddr>",
+ .help = "Display Memory Symbolically",
+ .flags = KDB_ENABLE_MEM_READ | KDB_REPEAT_NO_ARGS,
+ },
+ { .name = "mm",
+ .func = kdb_mm,
+ .usage = "<vaddr> <contents>",
+ .help = "Modify Memory Contents",
+ .flags = KDB_ENABLE_MEM_WRITE | KDB_REPEAT_NO_ARGS,
+ },
+ { .name = "go",
+ .func = kdb_go,
+ .usage = "[<vaddr>]",
+ .help = "Continue Execution",
+ .minlen = 1,
+ .flags = KDB_ENABLE_REG_WRITE |
+ KDB_ENABLE_ALWAYS_SAFE_NO_ARGS,
+ },
+ { .name = "rd",
+ .func = kdb_rd,
+ .usage = "",
+ .help = "Display Registers",
+ .flags = KDB_ENABLE_REG_READ,
+ },
+ { .name = "rm",
+ .func = kdb_rm,
+ .usage = "<reg> <contents>",
+ .help = "Modify Registers",
+ .flags = KDB_ENABLE_REG_WRITE,
+ },
+ { .name = "ef",
+ .func = kdb_ef,
+ .usage = "<vaddr>",
+ .help = "Display exception frame",
+ .flags = KDB_ENABLE_MEM_READ,
+ },
+ { .name = "bt",
+ .func = kdb_bt,
+ .usage = "[<vaddr>]",
+ .help = "Stack traceback",
+ .minlen = 1,
+ .flags = KDB_ENABLE_MEM_READ | KDB_ENABLE_INSPECT_NO_ARGS,
+ },
+ { .name = "btp",
+ .func = kdb_bt,
+ .usage = "<pid>",
+ .help = "Display stack for process <pid>",
+ .flags = KDB_ENABLE_INSPECT,
+ },
+ { .name = "bta",
+ .func = kdb_bt,
+ .usage = "[<state_chars>|A]",
+ .help = "Backtrace all processes whose state matches",
+ .flags = KDB_ENABLE_INSPECT,
+ },
+ { .name = "btc",
+ .func = kdb_bt,
+ .usage = "",
+ .help = "Backtrace current process on each cpu",
+ .flags = KDB_ENABLE_INSPECT,
+ },
+ { .name = "btt",
+ .func = kdb_bt,
+ .usage = "<vaddr>",
+ .help = "Backtrace process given its struct task address",
+ .flags = KDB_ENABLE_MEM_READ | KDB_ENABLE_INSPECT_NO_ARGS,
+ },
+ { .name = "env",
+ .func = kdb_env,
+ .usage = "",
+ .help = "Show environment variables",
+ .flags = KDB_ENABLE_ALWAYS_SAFE,
+ },
+ { .name = "set",
+ .func = kdb_set,
+ .usage = "",
+ .help = "Set environment variables",
+ .flags = KDB_ENABLE_ALWAYS_SAFE,
+ },
+ { .name = "help",
+ .func = kdb_help,
+ .usage = "",
+ .help = "Display Help Message",
+ .minlen = 1,
+ .flags = KDB_ENABLE_ALWAYS_SAFE,
+ },
+ { .name = "?",
+ .func = kdb_help,
+ .usage = "",
+ .help = "Display Help Message",
+ .flags = KDB_ENABLE_ALWAYS_SAFE,
+ },
+ { .name = "cpu",
+ .func = kdb_cpu,
+ .usage = "<cpunum>",
+ .help = "Switch to new cpu",
+ .flags = KDB_ENABLE_ALWAYS_SAFE_NO_ARGS,
+ },
+ { .name = "kgdb",
+ .func = kdb_kgdb,
+ .usage = "",
+ .help = "Enter kgdb mode",
+ .flags = 0,
+ },
+ { .name = "ps",
+ .func = kdb_ps,
+ .usage = "[<state_chars>|A]",
+ .help = "Display active task list",
+ .flags = KDB_ENABLE_INSPECT,
+ },
+ { .name = "pid",
+ .func = kdb_pid,
+ .usage = "<pidnum>",
+ .help = "Switch to another task",
+ .flags = KDB_ENABLE_INSPECT,
+ },
+ { .name = "reboot",
+ .func = kdb_reboot,
+ .usage = "",
+ .help = "Reboot the machine immediately",
+ .flags = KDB_ENABLE_REBOOT,
+ },
+#if defined(CONFIG_MODULES)
+ { .name = "lsmod",
+ .func = kdb_lsmod,
+ .usage = "",
+ .help = "List loaded kernel modules",
+ .flags = KDB_ENABLE_INSPECT,
+ },
+#endif
+#if defined(CONFIG_MAGIC_SYSRQ)
+ { .name = "sr",
+ .func = kdb_sr,
+ .usage = "<key>",
+ .help = "Magic SysRq key",
+ .flags = KDB_ENABLE_ALWAYS_SAFE,
+ },
+#endif
+#if defined(CONFIG_PRINTK)
+ { .name = "dmesg",
+ .func = kdb_dmesg,
+ .usage = "[lines]",
+ .help = "Display syslog buffer",
+ .flags = KDB_ENABLE_ALWAYS_SAFE,
+ },
+#endif
+ { .name = "defcmd",
+ .func = kdb_defcmd,
+ .usage = "name \"usage\" \"help\"",
+ .help = "Define a set of commands, down to endefcmd",
+ /*
+ * Macros are always safe because when executed each
+ * internal command re-enters kdb_parse() and is safety
+ * checked individually.
+ */
+ .flags = KDB_ENABLE_ALWAYS_SAFE,
+ },
+ { .name = "kill",
+ .func = kdb_kill,
+ .usage = "<-signal> <pid>",
+ .help = "Send a signal to a process",
+ .flags = KDB_ENABLE_SIGNAL,
+ },
+ { .name = "summary",
+ .func = kdb_summary,
+ .usage = "",
+ .help = "Summarize the system",
+ .minlen = 4,
+ .flags = KDB_ENABLE_ALWAYS_SAFE,
+ },
+ { .name = "per_cpu",
+ .func = kdb_per_cpu,
+ .usage = "<sym> [<bytes>] [<cpu>]",
+ .help = "Display per_cpu variables",
+ .minlen = 3,
+ .flags = KDB_ENABLE_MEM_READ,
+ },
+ { .name = "grephelp",
+ .func = kdb_grep_help,
+ .usage = "",
+ .help = "Display help on | grep",
+ .flags = KDB_ENABLE_ALWAYS_SAFE,
+ },
+};
+
+static kdbtab_t nmicmd = {
+ .name = "disable_nmi",
+ .func = kdb_disable_nmi,
+ .usage = "",
+ .help = "Disable NMI entry to KDB",
+ .flags = KDB_ENABLE_ALWAYS_SAFE,
+};
+
+/* Initialize the kdb command table. */
+static void __init kdb_inittab(void)
+{
+ kdb_register_table(maintab, ARRAY_SIZE(maintab));
+ if (arch_kgdb_ops.enable_nmi)
+ kdb_register_table(&nmicmd, 1);
+}
+
+/* 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");
+ }
+}
+
+/* Initialize 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;
+}