--- /dev/null
+#ifndef _KDB_H
+#define _KDB_H
+
+/*
+ * Kernel Debugger Architecture Independent Global Headers
+ *
+ * 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) 2000-2007 Silicon Graphics, Inc. All Rights Reserved.
+ * Copyright (C) 2000 Stephane Eranian <eranian@hpl.hp.com>
+ * Copyright (C) 2009 Jason Wessel <jason.wessel@windriver.com>
+ */
+
+#ifdef CONFIG_KGDB_KDB
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <asm/atomic.h>
+
+#define KDB_POLL_FUNC_MAX 5
+
+/*
+ * kdb_initial_cpu is initialized to -1, and is set to the cpu
+ * number whenever the kernel debugger is entered.
+ */
+extern int kdb_initial_cpu;
+extern atomic_t kdb_event;
+
+/*
+ * kdb_diemsg
+ *
+ * Contains a pointer to the last string supplied to the
+ * kernel 'die' panic function.
+ */
+extern const char *kdb_diemsg;
+
+#define KDB_FLAG_EARLYKDB (1 << 0) /* set from boot parameter kdb=early */
+#define KDB_FLAG_CATASTROPHIC (1 << 1) /* A catastrophic event has occurred */
+#define KDB_FLAG_CMD_INTERRUPT (1 << 2) /* Previous command was interrupted */
+#define KDB_FLAG_NOIPI (1 << 3) /* Do not send IPIs */
+#define KDB_FLAG_ONLY_DO_DUMP (1 << 4) /* Only do a dump, used when
+ * kdb is off */
+#define KDB_FLAG_NO_CONSOLE (1 << 5) /* No console is available,
+ * kdb is disabled */
+#define KDB_FLAG_NO_VT_CONSOLE (1 << 6) /* No VT console is available, do
+ * not use keyboard */
+#define KDB_FLAG_NO_I8042 (1 << 7) /* No i8042 chip is available, do
+ * not use keyboard */
+
+extern int kdb_flags; /* Global flags, see kdb_state for per cpu state */
+
+extern void kdb_save_flags(void);
+extern void kdb_restore_flags(void);
+
+#define KDB_FLAG(flag) (kdb_flags & KDB_FLAG_##flag)
+#define KDB_FLAG_SET(flag) ((void)(kdb_flags |= KDB_FLAG_##flag))
+#define KDB_FLAG_CLEAR(flag) ((void)(kdb_flags &= ~KDB_FLAG_##flag))
+
+/*
+ * External entry point for the kernel debugger. The pt_regs
+ * at the time of entry are supplied along with the reason for
+ * entry to the kernel debugger.
+ */
+
+typedef enum {
+ KDB_REASON_ENTER = 1, /* KDB_ENTER() trap/fault - regs valid */
+ KDB_REASON_ENTER_SLAVE, /* KDB_ENTER_SLAVE() trap/fault - regs valid */
+ KDB_REASON_BREAK, /* Breakpoint inst. - regs valid */
+ KDB_REASON_DEBUG, /* Debug Fault - regs valid */
+ KDB_REASON_OOPS, /* Kernel Oops - regs valid */
+ KDB_REASON_SWITCH, /* CPU switch - regs valid*/
+ KDB_REASON_KEYBOARD, /* Keyboard entry - regs valid */
+ KDB_REASON_NMI, /* Non-maskable interrupt; regs valid */
+ KDB_REASON_RECURSE, /* Recursive entry to kdb;
+ * regs probably valid */
+ KDB_REASON_SSTEP, /* Single Step trap. - regs valid */
+} kdb_reason_t;
+
+extern int kdb_printf(const char *, ...)
+ __attribute__ ((format (printf, 1, 2)));
+typedef int (*kdb_printf_t)(const char *, ...)
+ __attribute__ ((format (printf, 1, 2)));
+
+extern void kdb_init(int level);
+
+/* Access to kdb specific polling devices */
+typedef int (*get_char_func)(void);
+extern get_char_func kdb_poll_funcs[];
+extern int kdb_get_kbd_char(void);
+
+static inline
+int kdb_process_cpu(const struct task_struct *p)
+{
+ unsigned int cpu = task_thread_info(p)->cpu;
+ if (cpu > num_possible_cpus())
+ cpu = 0;
+ return cpu;
+}
+
+/* kdb access to register set for stack dumping */
+extern struct pt_regs *kdb_current_regs;
+
+#else /* ! CONFIG_KGDB_KDB */
+#define kdb_printf(...)
+#define kdb_init(x)
+#endif /* CONFIG_KGDB_KDB */
+enum {
+ KDB_NOT_INITIALIZED,
+ KDB_INIT_EARLY,
+ KDB_INIT_FULL,
+};
+#endif /* !_KDB_H */
#
obj-$(CONFIG_KGDB) += debug_core.o gdbstub.o
+obj-$(CONFIG_KGDB_KDB) += kdb/
--- /dev/null
+gen-kdb_cmds.c
--- /dev/null
+# 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) 2009 Wind River Systems, Inc. All Rights Reserved.
+#
+
+CCVERSION := $(shell $(CC) -v 2>&1 | sed -ne '$$p')
+obj-y := kdb_io.o kdb_main.o kdb_support.o kdb_bt.o gen-kdb_cmds.o kdb_bp.o kdb_debugger.o
+
+clean-files := gen-kdb_cmds.c
+
+quiet_cmd_gen-kdb = GENKDB $@
+ cmd_gen-kdb = $(AWK) 'BEGIN {print "\#include <linux/stddef.h>"; print "\#include <linux/init.h>"} \
+ /^\#/{next} \
+ /^[ \t]*$$/{next} \
+ {gsub(/"/, "\\\"", $$0); \
+ print "static __initdata char kdb_cmd" cmds++ "[] = \"" $$0 "\\n\";"} \
+ END {print "extern char *kdb_cmds[]; char __initdata *kdb_cmds[] = {"; for (i = 0; i < cmds; ++i) {print " kdb_cmd" i ","}; print(" NULL\n};");}' \
+ $(filter-out %/Makefile,$^) > $@#
+
+$(obj)/gen-kdb_cmds.c: $(src)/kdb_cmds $(src)/Makefile
+ $(call cmd,gen-kdb)
--- /dev/null
+/*
+ * Kernel Debugger Architecture Independent Breakpoint Handler
+ *
+ * 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) 2009 Wind River Systems, Inc. All Rights Reserved.
+ */
+
+#include <linux/string.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/kdb.h>
+#include <linux/kgdb.h>
+#include <linux/smp.h>
+#include <linux/sched.h>
+#include <linux/interrupt.h>
+#include "kdb_private.h"
+
+/*
+ * Table of kdb_breakpoints
+ */
+kdb_bp_t kdb_breakpoints[KDB_MAXBPT];
+
+static void kdb_setsinglestep(struct pt_regs *regs)
+{
+ KDB_STATE_SET(DOING_SS);
+}
+
+static char *kdb_rwtypes[] = {
+ "Instruction(i)",
+ "Instruction(Register)",
+ "Data Write",
+ "I/O",
+ "Data Access"
+};
+
+static char *kdb_bptype(kdb_bp_t *bp)
+{
+ if (bp->bp_type < 0 || bp->bp_type > 4)
+ return "";
+
+ return kdb_rwtypes[bp->bp_type];
+}
+
+static int kdb_parsebp(int argc, const char **argv, int *nextargp, kdb_bp_t *bp)
+{
+ int nextarg = *nextargp;
+ int diag;
+
+ bp->bph_length = 1;
+ if ((argc + 1) != nextarg) {
+ if (strnicmp(argv[nextarg], "datar", sizeof("datar")) == 0)
+ bp->bp_type = BP_ACCESS_WATCHPOINT;
+ else if (strnicmp(argv[nextarg], "dataw", sizeof("dataw")) == 0)
+ bp->bp_type = BP_WRITE_WATCHPOINT;
+ else if (strnicmp(argv[nextarg], "inst", sizeof("inst")) == 0)
+ bp->bp_type = BP_HARDWARE_BREAKPOINT;
+ else
+ return KDB_ARGCOUNT;
+
+ bp->bph_length = 1;
+
+ nextarg++;
+
+ if ((argc + 1) != nextarg) {
+ unsigned long len;
+
+ diag = kdbgetularg((char *)argv[nextarg],
+ &len);
+ if (diag)
+ return diag;
+
+
+ if (len > 8)
+ return KDB_BADLENGTH;
+
+ bp->bph_length = len;
+ nextarg++;
+ }
+
+ if ((argc + 1) != nextarg)
+ return KDB_ARGCOUNT;
+ }
+
+ *nextargp = nextarg;
+ return 0;
+}
+
+static int _kdb_bp_remove(kdb_bp_t *bp)
+{
+ int ret = 1;
+ if (!bp->bp_installed)
+ return ret;
+ if (!bp->bp_type)
+ ret = dbg_remove_sw_break(bp->bp_addr);
+ else
+ ret = arch_kgdb_ops.remove_hw_breakpoint(bp->bp_addr,
+ bp->bph_length,
+ bp->bp_type);
+ if (ret == 0)
+ bp->bp_installed = 0;
+ return ret;
+}
+
+static void kdb_handle_bp(struct pt_regs *regs, kdb_bp_t *bp)
+{
+ if (KDB_DEBUG(BP))
+ kdb_printf("regs->ip = 0x%lx\n", instruction_pointer(regs));
+
+ /*
+ * Setup single step
+ */
+ kdb_setsinglestep(regs);
+
+ /*
+ * Reset delay attribute
+ */
+ bp->bp_delay = 0;
+ bp->bp_delayed = 1;
+}
+
+static int _kdb_bp_install(struct pt_regs *regs, kdb_bp_t *bp)
+{
+ int ret;
+ /*
+ * Install the breakpoint, if it is not already installed.
+ */
+
+ if (KDB_DEBUG(BP))
+ kdb_printf("%s: bp_installed %d\n",
+ __func__, bp->bp_installed);
+ if (!KDB_STATE(SSBPT))
+ bp->bp_delay = 0;
+ if (bp->bp_installed)
+ return 1;
+ if (bp->bp_delay || (bp->bp_delayed && KDB_STATE(DOING_SS))) {
+ if (KDB_DEBUG(BP))
+ kdb_printf("%s: delayed bp\n", __func__);
+ kdb_handle_bp(regs, bp);
+ return 0;
+ }
+ if (!bp->bp_type)
+ ret = dbg_set_sw_break(bp->bp_addr);
+ else
+ ret = arch_kgdb_ops.set_hw_breakpoint(bp->bp_addr,
+ bp->bph_length,
+ bp->bp_type);
+ if (ret == 0) {
+ bp->bp_installed = 1;
+ } else {
+ kdb_printf("%s: failed to set breakpoint at 0x%lx\n",
+ __func__, bp->bp_addr);
+ return 1;
+ }
+ return 0;
+}
+
+/*
+ * kdb_bp_install
+ *
+ * Install kdb_breakpoints prior to returning from the
+ * kernel debugger. This allows the kdb_breakpoints to be set
+ * upon functions that are used internally by kdb, such as
+ * printk(). This function is only called once per kdb session.
+ */
+void kdb_bp_install(struct pt_regs *regs)
+{
+ int i;
+
+ for (i = 0; i < KDB_MAXBPT; i++) {
+ kdb_bp_t *bp = &kdb_breakpoints[i];
+
+ if (KDB_DEBUG(BP)) {
+ kdb_printf("%s: bp %d bp_enabled %d\n",
+ __func__, i, bp->bp_enabled);
+ }
+ if (bp->bp_enabled)
+ _kdb_bp_install(regs, bp);
+ }
+}
+
+/*
+ * kdb_bp_remove
+ *
+ * Remove kdb_breakpoints upon entry to the kernel debugger.
+ *
+ * Parameters:
+ * None.
+ * Outputs:
+ * None.
+ * Returns:
+ * None.
+ * Locking:
+ * None.
+ * Remarks:
+ */
+void kdb_bp_remove(void)
+{
+ int i;
+
+ for (i = KDB_MAXBPT - 1; i >= 0; i--) {
+ kdb_bp_t *bp = &kdb_breakpoints[i];
+
+ if (KDB_DEBUG(BP)) {
+ kdb_printf("%s: bp %d bp_enabled %d\n",
+ __func__, i, bp->bp_enabled);
+ }
+ if (bp->bp_enabled)
+ _kdb_bp_remove(bp);
+ }
+}
+
+
+/*
+ * kdb_printbp
+ *
+ * Internal function to format and print a breakpoint entry.
+ *
+ * Parameters:
+ * None.
+ * Outputs:
+ * None.
+ * Returns:
+ * None.
+ * Locking:
+ * None.
+ * Remarks:
+ */
+
+static void kdb_printbp(kdb_bp_t *bp, int i)
+{
+ kdb_printf("%s ", kdb_bptype(bp));
+ kdb_printf("BP #%d at ", i);
+ kdb_symbol_print(bp->bp_addr, NULL, KDB_SP_DEFAULT);
+
+ if (bp->bp_enabled)
+ kdb_printf("\n is enabled");
+ else
+ kdb_printf("\n is disabled");
+
+ kdb_printf("\taddr at %016lx, hardtype=%d installed=%d\n",
+ bp->bp_addr, bp->bp_type, bp->bp_installed);
+
+ kdb_printf("\n");
+}
+
+/*
+ * kdb_bp
+ *
+ * Handle the bp commands.
+ *
+ * [bp|bph] <addr-expression> [DATAR|DATAW]
+ *
+ * Parameters:
+ * argc Count of arguments in argv
+ * argv Space delimited command line arguments
+ * Outputs:
+ * None.
+ * Returns:
+ * Zero for success, a kdb diagnostic if failure.
+ * Locking:
+ * None.
+ * Remarks:
+ *
+ * bp Set breakpoint on all cpus. Only use hardware assist if need.
+ * bph Set breakpoint on all cpus. Force hardware register
+ */
+
+static int kdb_bp(int argc, const char **argv)
+{
+ int i, bpno;
+ kdb_bp_t *bp, *bp_check;
+ int diag;
+ int free;
+ char *symname = NULL;
+ long offset = 0ul;
+ int nextarg;
+ kdb_bp_t template = {0};
+
+ if (argc == 0) {
+ /*
+ * Display breakpoint table
+ */
+ for (bpno = 0, bp = kdb_breakpoints; bpno < KDB_MAXBPT;
+ bpno++, bp++) {
+ if (bp->bp_free)
+ continue;
+ kdb_printbp(bp, bpno);
+ }
+
+ return 0;
+ }
+
+ nextarg = 1;
+ diag = kdbgetaddrarg(argc, argv, &nextarg, &template.bp_addr,
+ &offset, &symname);
+ if (diag)
+ return diag;
+ if (!template.bp_addr)
+ return KDB_BADINT;
+
+ /*
+ * Find an empty bp structure to allocate
+ */
+ free = KDB_MAXBPT;
+ for (bpno = 0, bp = kdb_breakpoints; bpno < KDB_MAXBPT; bpno++, bp++) {
+ if (bp->bp_free)
+ break;
+ }
+
+ if (bpno == KDB_MAXBPT)
+ return KDB_TOOMANYBPT;
+
+ if (strcmp(argv[0], "bph") == 0) {
+ template.bp_type = BP_HARDWARE_BREAKPOINT;
+ diag = kdb_parsebp(argc, argv, &nextarg, &template);
+ if (diag)
+ return diag;
+ } else {
+ template.bp_type = BP_BREAKPOINT;
+ }
+
+ /*
+ * Check for clashing breakpoints.
+ *
+ * Note, in this design we can't have hardware breakpoints
+ * enabled for both read and write on the same address.
+ */
+ for (i = 0, bp_check = kdb_breakpoints; i < KDB_MAXBPT;
+ i++, bp_check++) {
+ if (!bp_check->bp_free &&
+ bp_check->bp_addr == template.bp_addr) {
+ kdb_printf("You already have a breakpoint at "
+ kdb_bfd_vma_fmt0 "\n", template.bp_addr);
+ return KDB_DUPBPT;
+ }
+ }
+
+ template.bp_enabled = 1;
+
+ /*
+ * Actually allocate the breakpoint found earlier
+ */
+ *bp = template;
+ bp->bp_free = 0;
+
+ kdb_printbp(bp, bpno);
+
+ return 0;
+}
+
+/*
+ * kdb_bc
+ *
+ * Handles the 'bc', 'be', and 'bd' commands
+ *
+ * [bd|bc|be] <breakpoint-number>
+ * [bd|bc|be] *
+ *
+ * Parameters:
+ * argc Count of arguments in argv
+ * argv Space delimited command line arguments
+ * Outputs:
+ * None.
+ * Returns:
+ * Zero for success, a kdb diagnostic for failure
+ * Locking:
+ * None.
+ * Remarks:
+ */
+static int kdb_bc(int argc, const char **argv)
+{
+ unsigned long addr;
+ kdb_bp_t *bp = NULL;
+ int lowbp = KDB_MAXBPT;
+ int highbp = 0;
+ int done = 0;
+ int i;
+ int diag = 0;
+
+ int cmd; /* KDBCMD_B? */
+#define KDBCMD_BC 0
+#define KDBCMD_BE 1
+#define KDBCMD_BD 2
+
+ if (strcmp(argv[0], "be") == 0)
+ cmd = KDBCMD_BE;
+ else if (strcmp(argv[0], "bd") == 0)
+ cmd = KDBCMD_BD;
+ else
+ cmd = KDBCMD_BC;
+
+ if (argc != 1)
+ return KDB_ARGCOUNT;
+
+ if (strcmp(argv[1], "*") == 0) {
+ lowbp = 0;
+ highbp = KDB_MAXBPT;
+ } else {
+ diag = kdbgetularg(argv[1], &addr);
+ if (diag)
+ return diag;
+
+ /*
+ * For addresses less than the maximum breakpoint number,
+ * assume that the breakpoint number is desired.
+ */
+ if (addr < KDB_MAXBPT) {
+ bp = &kdb_breakpoints[addr];
+ lowbp = highbp = addr;
+ highbp++;
+ } else {
+ for (i = 0, bp = kdb_breakpoints; i < KDB_MAXBPT;
+ i++, bp++) {
+ if (bp->bp_addr == addr) {
+ lowbp = highbp = i;
+ highbp++;
+ break;
+ }
+ }
+ }
+ }
+
+ /*
+ * Now operate on the set of breakpoints matching the input
+ * criteria (either '*' for all, or an individual breakpoint).
+ */
+ for (bp = &kdb_breakpoints[lowbp], i = lowbp;
+ i < highbp;
+ i++, bp++) {
+ if (bp->bp_free)
+ continue;
+
+ done++;
+
+ switch (cmd) {
+ case KDBCMD_BC:
+ bp->bp_enabled = 0;
+
+ kdb_printf("Breakpoint %d at "
+ kdb_bfd_vma_fmt " cleared\n",
+ i, bp->bp_addr);
+
+ bp->bp_addr = 0;
+ bp->bp_free = 1;
+
+ break;
+ case KDBCMD_BE:
+ bp->bp_enabled = 1;
+
+ kdb_printf("Breakpoint %d at "
+ kdb_bfd_vma_fmt " enabled",
+ i, bp->bp_addr);
+
+ kdb_printf("\n");
+ break;
+ case KDBCMD_BD:
+ if (!bp->bp_enabled)
+ break;
+
+ bp->bp_enabled = 0;
+
+ kdb_printf("Breakpoint %d at "
+ kdb_bfd_vma_fmt " disabled\n",
+ i, bp->bp_addr);
+
+ break;
+ }
+ if (bp->bp_delay && (cmd == KDBCMD_BC || cmd == KDBCMD_BD)) {
+ bp->bp_delay = 0;
+ KDB_STATE_CLEAR(SSBPT);
+ }
+ }
+
+ return (!done) ? KDB_BPTNOTFOUND : 0;
+}
+
+/*
+ * kdb_ss
+ *
+ * Process the 'ss' (Single Step) and 'ssb' (Single Step to Branch)
+ * commands.
+ *
+ * ss
+ * ssb
+ *
+ * Parameters:
+ * argc Argument count
+ * argv Argument vector
+ * Outputs:
+ * None.
+ * Returns:
+ * KDB_CMD_SS[B] for success, a kdb error if failure.
+ * Locking:
+ * None.
+ * Remarks:
+ *
+ * Set the arch specific option to trigger a debug trap after the next
+ * instruction.
+ *
+ * For 'ssb', set the trace flag in the debug trap handler
+ * after printing the current insn and return directly without
+ * invoking the kdb command processor, until a branch instruction
+ * is encountered.
+ */
+
+static int kdb_ss(int argc, const char **argv)
+{
+ int ssb = 0;
+
+ ssb = (strcmp(argv[0], "ssb") == 0);
+ if (argc != 0)
+ return KDB_ARGCOUNT;
+ /*
+ * Set trace flag and go.
+ */
+ KDB_STATE_SET(DOING_SS);
+ if (ssb) {
+ KDB_STATE_SET(DOING_SSB);
+ return KDB_CMD_SSB;
+ }
+ return KDB_CMD_SS;
+}
+
+/* Initialize the breakpoint table and register breakpoint commands. */
+
+void __init kdb_initbptab(void)
+{
+ int i;
+ kdb_bp_t *bp;
+
+ /*
+ * First time initialization.
+ */
+ memset(&kdb_breakpoints, '\0', sizeof(kdb_breakpoints));
+
+ for (i = 0, bp = kdb_breakpoints; i < KDB_MAXBPT; i++, bp++)
+ bp->bp_free = 1;
+
+ kdb_register_repeat("bp", kdb_bp, "[<vaddr>]",
+ "Set/Display breakpoints", 0, KDB_REPEAT_NO_ARGS);
+ kdb_register_repeat("bl", kdb_bp, "[<vaddr>]",
+ "Display breakpoints", 0, KDB_REPEAT_NO_ARGS);
+ if (arch_kgdb_ops.flags & KGDB_HW_BREAKPOINT)
+ kdb_register_repeat("bph", kdb_bp, "[<vaddr>]",
+ "[datar [length]|dataw [length]] Set hw brk", 0, KDB_REPEAT_NO_ARGS);
+ kdb_register_repeat("bc", kdb_bc, "<bpnum>",
+ "Clear Breakpoint", 0, KDB_REPEAT_NONE);
+ kdb_register_repeat("be", kdb_bc, "<bpnum>",
+ "Enable Breakpoint", 0, KDB_REPEAT_NONE);
+ kdb_register_repeat("bd", kdb_bc, "<bpnum>",
+ "Disable Breakpoint", 0, KDB_REPEAT_NONE);
+
+ kdb_register_repeat("ss", kdb_ss, "",
+ "Single Step", 1, KDB_REPEAT_NO_ARGS);
+ kdb_register_repeat("ssb", kdb_ss, "",
+ "Single step to branch/call", 0, KDB_REPEAT_NO_ARGS);
+ /*
+ * Architecture dependent initialization.
+ */
+}
--- /dev/null
+/*
+ * Kernel Debugger Architecture Independent Stack Traceback
+ *
+ * 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) 2009 Wind River Systems, Inc. All Rights Reserved.
+ */
+
+#include <linux/ctype.h>
+#include <linux/string.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/kdb.h>
+#include <linux/nmi.h>
+#include <asm/system.h>
+#include "kdb_private.h"
+
+
+static void kdb_show_stack(struct task_struct *p, void *addr)
+{
+ int old_lvl = console_loglevel;
+ console_loglevel = 15;
+ kdb_set_current_task(p);
+ if (addr) {
+ show_stack((struct task_struct *)p, addr);
+ } else if (kdb_current_regs) {
+#ifdef CONFIG_X86
+ show_stack(p, &kdb_current_regs->sp);
+#else
+ show_stack(p, NULL);
+#endif
+ } else {
+ show_stack(p, NULL);
+ }
+ console_loglevel = old_lvl;
+}
+
+/*
+ * kdb_bt
+ *
+ * This function implements the 'bt' command. Print a stack
+ * traceback.
+ *
+ * bt [<address-expression>] (addr-exp is for alternate stacks)
+ * btp <pid> Kernel stack for <pid>
+ * btt <address-expression> Kernel stack for task structure at
+ * <address-expression>
+ * bta [DRSTCZEUIMA] All useful processes, optionally
+ * filtered by state
+ * btc [<cpu>] The current process on one cpu,
+ * default is all cpus
+ *
+ * bt <address-expression> refers to a address on the stack, that location
+ * is assumed to contain a return address.
+ *
+ * btt <address-expression> refers to the address of a struct task.
+ *
+ * Inputs:
+ * argc argument count
+ * argv argument vector
+ * Outputs:
+ * None.
+ * Returns:
+ * zero for success, a kdb diagnostic if error
+ * Locking:
+ * none.
+ * Remarks:
+ * Backtrack works best when the code uses frame pointers. But even
+ * without frame pointers we should get a reasonable trace.
+ *
+ * mds comes in handy when examining the stack to do a manual traceback or
+ * to get a starting point for bt <address-expression>.
+ */
+
+static int
+kdb_bt1(struct task_struct *p, unsigned long mask,
+ int argcount, int btaprompt)
+{
+ char buffer[2];
+ if (kdb_getarea(buffer[0], (unsigned long)p) ||
+ kdb_getarea(buffer[0], (unsigned long)(p+1)-1))
+ return KDB_BADADDR;
+ if (!kdb_task_state(p, mask))
+ return 0;
+ kdb_printf("Stack traceback for pid %d\n", p->pid);
+ kdb_ps1(p);
+ kdb_show_stack(p, NULL);
+ if (btaprompt) {
+ kdb_getstr(buffer, sizeof(buffer),
+ "Enter <q> to end, <cr> to continue:");
+ if (buffer[0] == 'q') {
+ kdb_printf("\n");
+ return 1;
+ }
+ }
+ touch_nmi_watchdog();
+ return 0;
+}
+
+int
+kdb_bt(int argc, const char **argv)
+{
+ int diag;
+ int argcount = 5;
+ int btaprompt = 1;
+ int nextarg;
+ unsigned long addr;
+ long offset;
+
+ kdbgetintenv("BTARGS", &argcount); /* Arguments to print */
+ kdbgetintenv("BTAPROMPT", &btaprompt); /* Prompt after each
+ * proc in bta */
+
+ if (strcmp(argv[0], "bta") == 0) {
+ struct task_struct *g, *p;
+ unsigned long cpu;
+ unsigned long mask = kdb_task_state_string(argc ? argv[1] :
+ NULL);
+ if (argc == 0)
+ kdb_ps_suppressed();
+ /* Run the active tasks first */
+ for_each_online_cpu(cpu) {
+ p = kdb_curr_task(cpu);
+ if (kdb_bt1(p, mask, argcount, btaprompt))
+ return 0;
+ }
+ /* Now the inactive tasks */
+ kdb_do_each_thread(g, p) {
+ if (task_curr(p))
+ continue;
+ if (kdb_bt1(p, mask, argcount, btaprompt))
+ return 0;
+ } kdb_while_each_thread(g, p);
+ } else if (strcmp(argv[0], "btp") == 0) {
+ struct task_struct *p;
+ unsigned long pid;
+ if (argc != 1)
+ return KDB_ARGCOUNT;
+ diag = kdbgetularg((char *)argv[1], &pid);
+ if (diag)
+ return diag;
+ p = find_task_by_pid_ns(pid, &init_pid_ns);
+ if (p) {
+ kdb_set_current_task(p);
+ return kdb_bt1(p, ~0UL, argcount, 0);
+ }
+ kdb_printf("No process with pid == %ld found\n", pid);
+ return 0;
+ } else if (strcmp(argv[0], "btt") == 0) {
+ if (argc != 1)
+ return KDB_ARGCOUNT;
+ diag = kdbgetularg((char *)argv[1], &addr);
+ if (diag)
+ return diag;
+ kdb_set_current_task((struct task_struct *)addr);
+ return kdb_bt1((struct task_struct *)addr, ~0UL, argcount, 0);
+ } else if (strcmp(argv[0], "btc") == 0) {
+ unsigned long cpu = ~0;
+ struct task_struct *save_current_task = kdb_current_task;
+ char buf[80];
+ if (argc > 1)
+ return KDB_ARGCOUNT;
+ if (argc == 1) {
+ diag = kdbgetularg((char *)argv[1], &cpu);
+ if (diag)
+ return diag;
+ }
+ /* Recursive use of kdb_parse, do not use argv after
+ * this point */
+ argv = NULL;
+ if (cpu != ~0) {
+ if (cpu >= num_possible_cpus() || !cpu_online(cpu)) {
+ kdb_printf("no process for cpu %ld\n", cpu);
+ return 0;
+ }
+ sprintf(buf, "btt 0x%p\n", KDB_TSK(cpu));
+ kdb_parse(buf);
+ return 0;
+ }
+ kdb_printf("btc: cpu status: ");
+ kdb_parse("cpu\n");
+ for_each_online_cpu(cpu) {
+ sprintf(buf, "btt 0x%p\n", KDB_TSK(cpu));
+ kdb_parse(buf);
+ touch_nmi_watchdog();
+ }
+ kdb_set_current_task(save_current_task);
+ return 0;
+ } else {
+ if (argc) {
+ nextarg = 1;
+ diag = kdbgetaddrarg(argc, argv, &nextarg, &addr,
+ &offset, NULL);
+ if (diag)
+ return diag;
+ kdb_show_stack(kdb_current_task, (void *)addr);
+ return 0;
+ } else {
+ return kdb_bt1(kdb_current_task, ~0UL, argcount, 0);
+ }
+ }
+
+ /* NOTREACHED */
+ return 0;
+}
--- /dev/null
+# Initial commands for kdb, alter to suit your needs.
+# These commands are executed in kdb_init() context, no SMP, no
+# processes. Commands that require process data (including stack or
+# registers) are not reliable this early. set and bp commands should
+# be safe. Global breakpoint commands affect each cpu as it is booted.
+
+# Standard debugging information for first level support, just type archkdb
+# or archkdbcpu or archkdbshort at the kdb prompt.
+
+defcmd dumpcommon "" "Common kdb debugging"
+ set BTAPROMPT 0
+ set LINES 10000
+ -summary
+ -cpu
+ -ps
+ -dmesg 600
+ -bt
+endefcmd
+
+defcmd dumpall "" "First line debugging"
+ set BTSYMARG 1
+ set BTARGS 9
+ pid R
+ -dumpcommon
+ -bta
+endefcmd
+
+defcmd dumpcpu "" "Same as dumpall but only tasks on cpus"
+ set BTSYMARG 1
+ set BTARGS 9
+ pid R
+ -dumpcommon
+ -btc
+endefcmd
+
--- /dev/null
+/*
+ * Created by: Jason Wessel <jason.wessel@windriver.com>
+ *
+ * Copyright (c) 2009 Wind River Systems, Inc. All Rights Reserved.
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/kgdb.h>
+#include <linux/kdb.h>
+#include <linux/kdebug.h>
+#include "kdb_private.h"
+#include "../debug_core.h"
+
+/*
+ * KDB interface to KGDB internals
+ */
+get_char_func kdb_poll_funcs[] = {
+ dbg_io_get_char,
+ NULL,
+};
+
+int kdb_stub(struct kgdb_state *ks)
+{
+ int error = 0;
+ kdb_bp_t *bp;
+ unsigned long addr = kgdb_arch_pc(ks->ex_vector, ks->linux_regs);
+ kdb_reason_t reason = KDB_REASON_OOPS;
+ kdb_dbtrap_t db_result = KDB_DB_NOBPT;
+ int i;
+
+ if (KDB_STATE(REENTRY)) {
+ reason = KDB_REASON_SWITCH;
+ KDB_STATE_CLEAR(REENTRY);
+ addr = instruction_pointer(ks->linux_regs);
+ }
+ ks->pass_exception = 0;
+ if (atomic_read(&kgdb_setting_breakpoint))
+ reason = KDB_REASON_KEYBOARD;
+
+ for (i = 0, bp = kdb_breakpoints; i < KDB_MAXBPT; i++, bp++) {
+ if ((bp->bp_enabled) && (bp->bp_addr == addr)) {
+ reason = KDB_REASON_BREAK;
+ db_result = KDB_DB_BPT;
+ if (addr != instruction_pointer(ks->linux_regs))
+ kgdb_arch_set_pc(ks->linux_regs, addr);
+ break;
+ }
+ }
+ if (reason == KDB_REASON_BREAK || reason == KDB_REASON_SWITCH) {
+ for (i = 0, bp = kdb_breakpoints; i < KDB_MAXBPT; i++, bp++) {
+ if (bp->bp_free)
+ continue;
+ if (bp->bp_addr == addr) {
+ bp->bp_delay = 1;
+ bp->bp_delayed = 1;
+ /*
+ * SSBPT is set when the kernel debugger must single step a
+ * task in order to re-establish an instruction breakpoint
+ * which uses the instruction replacement mechanism. It is
+ * cleared by any action that removes the need to single-step
+ * the breakpoint.
+ */
+ reason = KDB_REASON_BREAK;
+ db_result = KDB_DB_BPT;
+ KDB_STATE_SET(SSBPT);
+ break;
+ }
+ }
+ }
+
+ if (reason != KDB_REASON_BREAK && ks->ex_vector == 0 &&
+ ks->signo == SIGTRAP) {
+ reason = KDB_REASON_SSTEP;
+ db_result = KDB_DB_BPT;
+ }
+ /* Set initial kdb state variables */
+ KDB_STATE_CLEAR(KGDB_TRANS);
+ kdb_initial_cpu = ks->cpu;
+ kdb_current_task = kgdb_info[ks->cpu].task;
+ kdb_current_regs = kgdb_info[ks->cpu].debuggerinfo;
+ /* Remove any breakpoints as needed by kdb and clear single step */
+ kdb_bp_remove();
+ KDB_STATE_CLEAR(DOING_SS);
+ KDB_STATE_CLEAR(DOING_SSB);
+ /* zero out any offline cpu data */
+ for_each_present_cpu(i) {
+ if (!cpu_online(i)) {
+ kgdb_info[i].debuggerinfo = NULL;
+ kgdb_info[i].task = NULL;
+ }
+ }
+ if (ks->err_code == DIE_OOPS || reason == KDB_REASON_OOPS) {
+ ks->pass_exception = 1;
+ KDB_FLAG_SET(CATASTROPHIC);
+ }
+ kdb_initial_cpu = ks->cpu;
+ if (KDB_STATE(SSBPT) && reason == KDB_REASON_SSTEP) {
+ KDB_STATE_CLEAR(SSBPT);
+ KDB_STATE_CLEAR(DOING_SS);
+ } else {
+ /* Start kdb main loop */
+ error = kdb_main_loop(KDB_REASON_ENTER, reason,
+ ks->err_code, db_result, ks->linux_regs);
+ }
+ /*
+ * Upon exit from the kdb main loop setup break points and restart
+ * the system based on the requested continue state
+ */
+ kdb_initial_cpu = -1;
+ kdb_current_task = NULL;
+ kdb_current_regs = NULL;
+ kdbnearsym_cleanup();
+ if (error == KDB_CMD_KGDB) {
+ if (KDB_STATE(DOING_KGDB) || KDB_STATE(DOING_KGDB2)) {
+ /*
+ * This inteface glue which allows kdb to transition in into
+ * the gdb stub. In order to do this the '?' or '' gdb serial
+ * packet response is processed here. And then control is
+ * passed to the gdbstub.
+ */
+ if (KDB_STATE(DOING_KGDB))
+ gdbstub_state(ks, "?");
+ else
+ gdbstub_state(ks, "");
+ KDB_STATE_CLEAR(DOING_KGDB);
+ KDB_STATE_CLEAR(DOING_KGDB2);
+ }
+ return DBG_PASS_EVENT;
+ }
+ kdb_bp_install(ks->linux_regs);
+ dbg_activate_sw_breakpoints();
+ /* Set the exit state to a single step or a continue */
+ if (KDB_STATE(DOING_SS))
+ gdbstub_state(ks, "s");
+ else
+ gdbstub_state(ks, "c");
+
+ KDB_FLAG_CLEAR(CATASTROPHIC);
+
+ /* Invoke arch specific exception handling prior to system resume */
+ kgdb_info[ks->cpu].ret_state = gdbstub_state(ks, "e");
+ if (ks->pass_exception)
+ kgdb_info[ks->cpu].ret_state = 1;
+ if (error == KDB_CMD_CPU) {
+ KDB_STATE_SET(REENTRY);
+ /*
+ * Force clear the single step bit because kdb emulates this
+ * differently vs the gdbstub
+ */
+ kgdb_single_step = 0;
+ dbg_deactivate_sw_breakpoints();
+ return DBG_SWITCH_CPU_EVENT;
+ }
+ return kgdb_info[ks->cpu].ret_state;
+}
+
--- /dev/null
+/*
+ * Kernel Debugger Architecture Independent Console I/O handler
+ *
+ * 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) 1999-2006 Silicon Graphics, Inc. All Rights Reserved.
+ * Copyright (c) 2009 Wind River Systems, Inc. All Rights Reserved.
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/ctype.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/kdev_t.h>
+#include <linux/console.h>
+#include <linux/string.h>
+#include <linux/sched.h>
+#include <linux/smp.h>
+#include <linux/nmi.h>
+#include <linux/delay.h>
+#include <linux/kdb.h>
+#include <linux/kallsyms.h>
+#include "kdb_private.h"
+
+#define CMD_BUFLEN 256
+char kdb_prompt_str[CMD_BUFLEN];
+
+
+static void kgdb_transition_check(char *buffer)
+{
+ int slen = strlen(buffer);
+ if (strncmp(buffer, "$?#3f", slen) != 0 &&
+ strncmp(buffer, "$qSupported#37", slen) != 0 &&
+ strncmp(buffer, "+$qSupported#37", slen) != 0) {
+ KDB_STATE_SET(KGDB_TRANS);
+ kdb_printf("%s", buffer);
+ }
+}
+
+static int kdb_read_get_key(char *buffer, size_t bufsize)
+{
+#define ESCAPE_UDELAY 1000
+#define ESCAPE_DELAY (2*1000000/ESCAPE_UDELAY) /* 2 seconds worth of udelays */
+ char escape_data[5]; /* longest vt100 escape sequence is 4 bytes */
+ char *ped = escape_data;
+ int escape_delay = 0;
+ get_char_func *f, *f_escape = NULL;
+ int key;
+
+ for (f = &kdb_poll_funcs[0]; ; ++f) {
+ if (*f == NULL) {
+ /* Reset NMI watchdog once per poll loop */
+ touch_nmi_watchdog();
+ f = &kdb_poll_funcs[0];
+ }
+ if (escape_delay == 2) {
+ *ped = '\0';
+ ped = escape_data;
+ --escape_delay;
+ }
+ if (escape_delay == 1) {
+ key = *ped++;
+ if (!*ped)
+ --escape_delay;
+ break;
+ }
+ key = (*f)();
+ if (key == -1) {
+ if (escape_delay) {
+ udelay(ESCAPE_UDELAY);
+ --escape_delay;
+ }
+ continue;
+ }
+ if (bufsize <= 2) {
+ if (key == '\r')
+ key = '\n';
+ *buffer++ = key;
+ *buffer = '\0';
+ return -1;
+ }
+ if (escape_delay == 0 && key == '\e') {
+ escape_delay = ESCAPE_DELAY;
+ ped = escape_data;
+ f_escape = f;
+ }
+ if (escape_delay) {
+ *ped++ = key;
+ if (f_escape != f) {
+ escape_delay = 2;
+ continue;
+ }
+ if (ped - escape_data == 1) {
+ /* \e */
+ continue;
+ } else if (ped - escape_data == 2) {
+ /* \e<something> */
+ if (key != '[')
+ escape_delay = 2;
+ continue;
+ } else if (ped - escape_data == 3) {
+ /* \e[<something> */
+ int mapkey = 0;
+ switch (key) {
+ case 'A': /* \e[A, up arrow */
+ mapkey = 16;
+ break;
+ case 'B': /* \e[B, down arrow */
+ mapkey = 14;
+ break;
+ case 'C': /* \e[C, right arrow */
+ mapkey = 6;
+ break;
+ case 'D': /* \e[D, left arrow */
+ mapkey = 2;
+ break;
+ case '1': /* dropthrough */
+ case '3': /* dropthrough */
+ /* \e[<1,3,4>], may be home, del, end */
+ case '4':
+ mapkey = -1;
+ break;
+ }
+ if (mapkey != -1) {
+ if (mapkey > 0) {
+ escape_data[0] = mapkey;
+ escape_data[1] = '\0';
+ }
+ escape_delay = 2;
+ }
+ continue;
+ } else if (ped - escape_data == 4) {
+ /* \e[<1,3,4><something> */
+ int mapkey = 0;
+ if (key == '~') {
+ switch (escape_data[2]) {
+ case '1': /* \e[1~, home */
+ mapkey = 1;
+ break;
+ case '3': /* \e[3~, del */
+ mapkey = 4;
+ break;
+ case '4': /* \e[4~, end */
+ mapkey = 5;
+ break;
+ }
+ }
+ if (mapkey > 0) {
+ escape_data[0] = mapkey;
+ escape_data[1] = '\0';
+ }
+ escape_delay = 2;
+ continue;
+ }
+ }
+ break; /* A key to process */
+ }
+ return key;
+}
+
+/*
+ * kdb_read
+ *
+ * This function reads a string of characters, terminated by
+ * a newline, or by reaching the end of the supplied buffer,
+ * from the current kernel debugger console device.
+ * Parameters:
+ * buffer - Address of character buffer to receive input characters.
+ * bufsize - size, in bytes, of the character buffer
+ * Returns:
+ * Returns a pointer to the buffer containing the received
+ * character string. This string will be terminated by a
+ * newline character.
+ * Locking:
+ * No locks are required to be held upon entry to this
+ * function. It is not reentrant - it relies on the fact
+ * that while kdb is running on only one "master debug" cpu.
+ * Remarks:
+ *
+ * The buffer size must be >= 2. A buffer size of 2 means that the caller only
+ * wants a single key.
+ *
+ * An escape key could be the start of a vt100 control sequence such as \e[D
+ * (left arrow) or it could be a character in its own right. The standard
+ * method for detecting the difference is to wait for 2 seconds to see if there
+ * are any other characters. kdb is complicated by the lack of a timer service
+ * (interrupts are off), by multiple input sources and by the need to sometimes
+ * return after just one key. Escape sequence processing has to be done as
+ * states in the polling loop.
+ */
+
+static char *kdb_read(char *buffer, size_t bufsize)
+{
+ char *cp = buffer;
+ char *bufend = buffer+bufsize-2; /* Reserve space for newline
+ * and null byte */
+ char *lastchar;
+ char *p_tmp;
+ char tmp;
+ static char tmpbuffer[CMD_BUFLEN];
+ int len = strlen(buffer);
+ int len_tmp;
+ int tab = 0;
+ int count;
+ int i;
+ int diag, dtab_count;
+ int key;
+
+
+ diag = kdbgetintenv("DTABCOUNT", &dtab_count);
+ if (diag)
+ dtab_count = 30;
+
+ if (len > 0) {
+ cp += len;
+ if (*(buffer+len-1) == '\n')
+ cp--;
+ }
+
+ lastchar = cp;
+ *cp = '\0';
+ kdb_printf("%s", buffer);
+poll_again:
+ key = kdb_read_get_key(buffer, bufsize);
+ if (key == -1)
+ return buffer;
+ if (key != 9)
+ tab = 0;
+ switch (key) {
+ case 8: /* backspace */
+ if (cp > buffer) {
+ if (cp < lastchar) {
+ memcpy(tmpbuffer, cp, lastchar - cp);
+ memcpy(cp-1, tmpbuffer, lastchar - cp);
+ }
+ *(--lastchar) = '\0';
+ --cp;
+ kdb_printf("\b%s \r", cp);
+ tmp = *cp;
+ *cp = '\0';
+ kdb_printf(kdb_prompt_str);
+ kdb_printf("%s", buffer);
+ *cp = tmp;
+ }
+ break;
+ case 13: /* enter */
+ *lastchar++ = '\n';
+ *lastchar++ = '\0';
+ kdb_printf("\n");
+ return buffer;
+ case 4: /* Del */
+ if (cp < lastchar) {
+ memcpy(tmpbuffer, cp+1, lastchar - cp - 1);
+ memcpy(cp, tmpbuffer, lastchar - cp - 1);
+ *(--lastchar) = '\0';
+ kdb_printf("%s \r", cp);
+ tmp = *cp;
+ *cp = '\0';
+ kdb_printf(kdb_prompt_str);
+ kdb_printf("%s", buffer);
+ *cp = tmp;
+ }
+ break;
+ case 1: /* Home */
+ if (cp > buffer) {
+ kdb_printf("\r");
+ kdb_printf(kdb_prompt_str);
+ cp = buffer;
+ }
+ break;
+ case 5: /* End */
+ if (cp < lastchar) {
+ kdb_printf("%s", cp);
+ cp = lastchar;
+ }
+ break;
+ case 2: /* Left */
+ if (cp > buffer) {
+ kdb_printf("\b");
+ --cp;
+ }
+ break;
+ case 14: /* Down */
+ memset(tmpbuffer, ' ',
+ strlen(kdb_prompt_str) + (lastchar-buffer));
+ *(tmpbuffer+strlen(kdb_prompt_str) +
+ (lastchar-buffer)) = '\0';
+ kdb_printf("\r%s\r", tmpbuffer);
+ *lastchar = (char)key;
+ *(lastchar+1) = '\0';
+ return lastchar;
+ case 6: /* Right */
+ if (cp < lastchar) {
+ kdb_printf("%c", *cp);
+ ++cp;
+ }
+ break;
+ case 16: /* Up */
+ memset(tmpbuffer, ' ',
+ strlen(kdb_prompt_str) + (lastchar-buffer));
+ *(tmpbuffer+strlen(kdb_prompt_str) +
+ (lastchar-buffer)) = '\0';
+ kdb_printf("\r%s\r", tmpbuffer);
+ *lastchar = (char)key;
+ *(lastchar+1) = '\0';
+ return lastchar;
+ case 9: /* Tab */
+ if (tab < 2)
+ ++tab;
+ p_tmp = buffer;
+ while (*p_tmp == ' ')
+ p_tmp++;
+ if (p_tmp > cp)
+ break;
+ memcpy(tmpbuffer, p_tmp, cp-p_tmp);
+ *(tmpbuffer + (cp-p_tmp)) = '\0';
+ p_tmp = strrchr(tmpbuffer, ' ');
+ if (p_tmp)
+ ++p_tmp;
+ else
+ p_tmp = tmpbuffer;
+ len = strlen(p_tmp);
+ count = kallsyms_symbol_complete(p_tmp,
+ sizeof(tmpbuffer) -
+ (p_tmp - tmpbuffer));
+ if (tab == 2 && count > 0) {
+ kdb_printf("\n%d symbols are found.", count);
+ if (count > dtab_count) {
+ count = dtab_count;
+ kdb_printf(" But only first %d symbols will"
+ " be printed.\nYou can change the"
+ " environment variable DTABCOUNT.",
+ count);
+ }
+ kdb_printf("\n");
+ for (i = 0; i < count; i++) {
+ if (kallsyms_symbol_next(p_tmp, i) < 0)
+ break;
+ kdb_printf("%s ", p_tmp);
+ *(p_tmp + len) = '\0';
+ }
+ if (i >= dtab_count)
+ kdb_printf("...");
+ kdb_printf("\n");
+ kdb_printf(kdb_prompt_str);
+ kdb_printf("%s", buffer);
+ } else if (tab != 2 && count > 0) {
+ len_tmp = strlen(p_tmp);
+ strncpy(p_tmp+len_tmp, cp, lastchar-cp+1);
+ len_tmp = strlen(p_tmp);
+ strncpy(cp, p_tmp+len, len_tmp-len + 1);
+ len = len_tmp - len;
+ kdb_printf("%s", cp);
+ cp += len;
+ lastchar += len;
+ }
+ kdb_nextline = 1; /* reset output line number */
+ break;
+ default:
+ if (key >= 32 && lastchar < bufend) {
+ if (cp < lastchar) {
+ memcpy(tmpbuffer, cp, lastchar - cp);
+ memcpy(cp+1, tmpbuffer, lastchar - cp);
+ *++lastchar = '\0';
+ *cp = key;
+ kdb_printf("%s\r", cp);
+ ++cp;
+ tmp = *cp;
+ *cp = '\0';
+ kdb_printf(kdb_prompt_str);
+ kdb_printf("%s", buffer);
+ *cp = tmp;
+ } else {
+ *++lastchar = '\0';
+ *cp++ = key;
+ /* The kgdb transition check will hide
+ * printed characters if we think that
+ * kgdb is connecting, until the check
+ * fails */
+ if (!KDB_STATE(KGDB_TRANS))
+ kgdb_transition_check(buffer);
+ else
+ kdb_printf("%c", key);
+ }
+ /* Special escape to kgdb */
+ if (lastchar - buffer >= 5 &&
+ strcmp(lastchar - 5, "$?#3f") == 0) {
+ strcpy(buffer, "kgdb");
+ KDB_STATE_SET(DOING_KGDB);
+ return buffer;
+ }
+ if (lastchar - buffer >= 14 &&
+ strcmp(lastchar - 14, "$qSupported#37") == 0) {
+ strcpy(buffer, "kgdb");
+ KDB_STATE_SET(DOING_KGDB2);
+ return buffer;
+ }
+ }
+ break;
+ }
+ goto poll_again;
+}
+
+/*
+ * kdb_getstr
+ *
+ * Print the prompt string and read a command from the
+ * input device.
+ *
+ * Parameters:
+ * buffer Address of buffer to receive command
+ * bufsize Size of buffer in bytes
+ * prompt Pointer to string to use as prompt string
+ * Returns:
+ * Pointer to command buffer.
+ * Locking:
+ * None.
+ * Remarks:
+ * For SMP kernels, the processor number will be
+ * substituted for %d, %x or %o in the prompt.
+ */
+
+char *kdb_getstr(char *buffer, size_t bufsize, char *prompt)
+{
+ if (prompt && kdb_prompt_str != prompt)
+ strncpy(kdb_prompt_str, prompt, CMD_BUFLEN);
+ kdb_printf(kdb_prompt_str);
+ kdb_nextline = 1; /* Prompt and input resets line number */
+ return kdb_read(buffer, bufsize);
+}
+
+/*
+ * kdb_input_flush
+ *
+ * Get rid of any buffered console input.
+ *
+ * Parameters:
+ * none
+ * Returns:
+ * nothing
+ * Locking:
+ * none
+ * Remarks:
+ * Call this function whenever you want to flush input. If there is any
+ * outstanding input, it ignores all characters until there has been no
+ * data for approximately 1ms.
+ */
+
+static void kdb_input_flush(void)
+{
+ get_char_func *f;
+ int res;
+ int flush_delay = 1;
+ while (flush_delay) {
+ flush_delay--;
+empty:
+ touch_nmi_watchdog();
+ for (f = &kdb_poll_funcs[0]; *f; ++f) {
+ res = (*f)();
+ if (res != -1) {
+ flush_delay = 1;
+ goto empty;
+ }
+ }
+ if (flush_delay)
+ mdelay(1);
+ }
+}
+
+/*
+ * kdb_printf
+ *
+ * Print a string to the output device(s).
+ *
+ * Parameters:
+ * printf-like format and optional args.
+ * Returns:
+ * 0
+ * Locking:
+ * None.
+ * Remarks:
+ * use 'kdbcons->write()' to avoid polluting 'log_buf' with
+ * kdb output.
+ *
+ * If the user is doing a cmd args | grep srch
+ * then kdb_grepping_flag is set.
+ * In that case we need to accumulate full lines (ending in \n) before
+ * searching for the pattern.
+ */
+
+static char kdb_buffer[256]; /* A bit too big to go on stack */
+static char *next_avail = kdb_buffer;
+static int size_avail;
+static int suspend_grep;
+
+/*
+ * search arg1 to see if it contains arg2
+ * (kdmain.c provides flags for ^pat and pat$)
+ *
+ * return 1 for found, 0 for not found
+ */
+static int kdb_search_string(char *searched, char *searchfor)
+{
+ char firstchar, *cp;
+ int len1, len2;
+
+ /* not counting the newline at the end of "searched" */
+ len1 = strlen(searched)-1;
+ len2 = strlen(searchfor);
+ if (len1 < len2)
+ return 0;
+ if (kdb_grep_leading && kdb_grep_trailing && len1 != len2)
+ return 0;
+ if (kdb_grep_leading) {
+ if (!strncmp(searched, searchfor, len2))
+ return 1;
+ } else if (kdb_grep_trailing) {
+ if (!strncmp(searched+len1-len2, searchfor, len2))
+ return 1;
+ } else {
+ firstchar = *searchfor;
+ cp = searched;
+ while ((cp = strchr(cp, firstchar))) {
+ if (!strncmp(cp, searchfor, len2))
+ return 1;
+ cp++;
+ }
+ }
+ return 0;
+}
+
+int kdb_printf(const char *fmt, ...)
+{
+ va_list ap;
+ int diag;
+ int linecount;
+ int logging, saved_loglevel = 0;
+ int got_printf_lock = 0;
+ int retlen = 0;
+ int fnd, len;
+ char *cp, *cp2, *cphold = NULL, replaced_byte = ' ';
+ char *moreprompt = "more> ";
+ struct console *c = console_drivers;
+ static DEFINE_SPINLOCK(kdb_printf_lock);
+ unsigned long uninitialized_var(flags);
+
+ preempt_disable();
+ /* Serialize kdb_printf if multiple cpus try to write at once.
+ * But if any cpu goes recursive in kdb, just print the output,
+ * even if it is interleaved with any other text.
+ */
+ if (!KDB_STATE(PRINTF_LOCK)) {
+ KDB_STATE_SET(PRINTF_LOCK);
+ spin_lock_irqsave(&kdb_printf_lock, flags);
+ got_printf_lock = 1;
+ atomic_inc(&kdb_event);
+ } else {
+ __acquire(kdb_printf_lock);
+ }
+
+ diag = kdbgetintenv("LINES", &linecount);
+ if (diag || linecount <= 1)
+ linecount = 24;
+
+ diag = kdbgetintenv("LOGGING", &logging);
+ if (diag)
+ logging = 0;
+
+ if (!kdb_grepping_flag || suspend_grep) {
+ /* normally, every vsnprintf starts a new buffer */
+ next_avail = kdb_buffer;
+ size_avail = sizeof(kdb_buffer);
+ }
+ va_start(ap, fmt);
+ vsnprintf(next_avail, size_avail, fmt, ap);
+ va_end(ap);
+
+ /*
+ * If kdb_parse() found that the command was cmd xxx | grep yyy
+ * then kdb_grepping_flag is set, and kdb_grep_string contains yyy
+ *
+ * Accumulate the print data up to a newline before searching it.
+ * (vsnprintf does null-terminate the string that it generates)
+ */
+
+ /* skip the search if prints are temporarily unconditional */
+ if (!suspend_grep && kdb_grepping_flag) {
+ cp = strchr(kdb_buffer, '\n');
+ if (!cp) {
+ /*
+ * Special cases that don't end with newlines
+ * but should be written without one:
+ * The "[nn]kdb> " prompt should
+ * appear at the front of the buffer.
+ *
+ * The "[nn]more " prompt should also be
+ * (MOREPROMPT -> moreprompt)
+ * written * but we print that ourselves,
+ * we set the suspend_grep flag to make
+ * it unconditional.
+ *
+ */
+ if (next_avail == kdb_buffer) {
+ /*
+ * these should occur after a newline,
+ * so they will be at the front of the
+ * buffer
+ */
+ cp2 = kdb_buffer;
+ len = strlen(kdb_prompt_str);
+ if (!strncmp(cp2, kdb_prompt_str, len)) {
+ /*
+ * We're about to start a new
+ * command, so we can go back
+ * to normal mode.
+ */
+ kdb_grepping_flag = 0;
+ goto kdb_printit;
+ }
+ }
+ /* no newline; don't search/write the buffer
+ until one is there */
+ len = strlen(kdb_buffer);
+ next_avail = kdb_buffer + len;
+ size_avail = sizeof(kdb_buffer) - len;
+ goto kdb_print_out;
+ }
+
+ /*
+ * The newline is present; print through it or discard
+ * it, depending on the results of the search.
+ */
+ cp++; /* to byte after the newline */
+ replaced_byte = *cp; /* remember what/where it was */
+ cphold = cp;
+ *cp = '\0'; /* end the string for our search */
+
+ /*
+ * We now have a newline at the end of the string
+ * Only continue with this output if it contains the
+ * search string.
+ */
+ fnd = kdb_search_string(kdb_buffer, kdb_grep_string);
+ if (!fnd) {
+ /*
+ * At this point the complete line at the start
+ * of kdb_buffer can be discarded, as it does
+ * not contain what the user is looking for.
+ * Shift the buffer left.
+ */
+ *cphold = replaced_byte;
+ strcpy(kdb_buffer, cphold);
+ len = strlen(kdb_buffer);
+ next_avail = kdb_buffer + len;
+ size_avail = sizeof(kdb_buffer) - len;
+ goto kdb_print_out;
+ }
+ /*
+ * at this point the string is a full line and
+ * should be printed, up to the null.
+ */
+ }
+kdb_printit:
+
+ /*
+ * Write to all consoles.
+ */
+ retlen = strlen(kdb_buffer);
+ while (c) {
+ c->write(c, kdb_buffer, retlen);
+ touch_nmi_watchdog();
+ c = c->next;
+ }
+ if (logging) {
+ saved_loglevel = console_loglevel;
+ console_loglevel = 0;
+ printk(KERN_INFO "%s", kdb_buffer);
+ }
+
+ if (KDB_STATE(PAGER) && strchr(kdb_buffer, '\n'))
+ kdb_nextline++;
+
+ /* check for having reached the LINES number of printed lines */
+ if (kdb_nextline == linecount) {
+ char buf1[16] = "";
+#if defined(CONFIG_SMP)
+ char buf2[32];
+#endif
+
+ /* Watch out for recursion here. Any routine that calls
+ * kdb_printf will come back through here. And kdb_read
+ * uses kdb_printf to echo on serial consoles ...
+ */
+ kdb_nextline = 1; /* In case of recursion */
+
+ /*
+ * Pause until cr.
+ */
+ moreprompt = kdbgetenv("MOREPROMPT");
+ if (moreprompt == NULL)
+ moreprompt = "more> ";
+
+#if defined(CONFIG_SMP)
+ if (strchr(moreprompt, '%')) {
+ sprintf(buf2, moreprompt, get_cpu());
+ put_cpu();
+ moreprompt = buf2;
+ }
+#endif
+
+ kdb_input_flush();
+ c = console_drivers;
+
+ while (c) {
+ c->write(c, moreprompt, strlen(moreprompt));
+ touch_nmi_watchdog();
+ c = c->next;
+ }
+
+ if (logging)
+ printk("%s", moreprompt);
+
+ kdb_read(buf1, 2); /* '2' indicates to return
+ * immediately after getting one key. */
+ kdb_nextline = 1; /* Really set output line 1 */
+
+ /* empty and reset the buffer: */
+ kdb_buffer[0] = '\0';
+ next_avail = kdb_buffer;
+ size_avail = sizeof(kdb_buffer);
+ if ((buf1[0] == 'q') || (buf1[0] == 'Q')) {
+ /* user hit q or Q */
+ KDB_FLAG_SET(CMD_INTERRUPT); /* command interrupted */
+ KDB_STATE_CLEAR(PAGER);
+ /* end of command output; back to normal mode */
+ kdb_grepping_flag = 0;
+ kdb_printf("\n");
+ } else if (buf1[0] == ' ') {
+ kdb_printf("\n");
+ suspend_grep = 1; /* for this recursion */
+ } else if (buf1[0] == '\n') {
+ kdb_nextline = linecount - 1;
+ kdb_printf("\r");
+ suspend_grep = 1; /* for this recursion */
+ } else if (buf1[0] && buf1[0] != '\n') {
+ /* user hit something other than enter */
+ suspend_grep = 1; /* for this recursion */
+ kdb_printf("\nOnly 'q' or 'Q' are processed at more "
+ "prompt, input ignored\n");
+ } else if (kdb_grepping_flag) {
+ /* user hit enter */
+ suspend_grep = 1; /* for this recursion */
+ kdb_printf("\n");
+ }
+ kdb_input_flush();
+ }
+
+ /*
+ * For grep searches, shift the printed string left.
+ * replaced_byte contains the character that was overwritten with
+ * the terminating null, and cphold points to the null.
+ * Then adjust the notion of available space in the buffer.
+ */
+ if (kdb_grepping_flag && !suspend_grep) {
+ *cphold = replaced_byte;
+ strcpy(kdb_buffer, cphold);
+ len = strlen(kdb_buffer);
+ next_avail = kdb_buffer + len;
+ size_avail = sizeof(kdb_buffer) - len;
+ }
+
+kdb_print_out:
+ suspend_grep = 0; /* end of what may have been a recursive call */
+ if (logging)
+ console_loglevel = saved_loglevel;
+ if (KDB_STATE(PRINTF_LOCK) && got_printf_lock) {
+ got_printf_lock = 0;
+ spin_unlock_irqrestore(&kdb_printf_lock, flags);
+ KDB_STATE_CLEAR(PRINTF_LOCK);
+ atomic_dec(&kdb_event);
+ } else {
+ __release(kdb_printf_lock);
+ }
+ preempt_enable();
+ return retlen;
+}
--- /dev/null
+/*
+ * 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;
+ show_regs(regs);
+ 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);
+ handle_sysrq(*argv[1], NULL);
+
+ 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)
+/* modules using other modules */
+struct module_use {
+ struct list_head list;
+ struct module *module_which_uses;
+};
+
+/*
+ * 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->modules_which_use_me,
+ list)
+ kdb_printf("%s ", use->module_which_uses->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;
+}
--- /dev/null
+#ifndef _KDBPRIVATE_H
+#define _KDBPRIVATE_H
+
+/*
+ * Kernel Debugger Architecture Independent Private Headers
+ *
+ * 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) 2000-2004 Silicon Graphics, Inc. All Rights Reserved.
+ * Copyright (c) 2009 Wind River Systems, Inc. All Rights Reserved.
+ */
+
+#include <linux/kgdb.h>
+#include "../debug_core.h"
+
+/* Kernel Debugger Error codes. Must not overlap with command codes. */
+#define KDB_NOTFOUND (-1)
+#define KDB_ARGCOUNT (-2)
+#define KDB_BADWIDTH (-3)
+#define KDB_BADRADIX (-4)
+#define KDB_NOTENV (-5)
+#define KDB_NOENVVALUE (-6)
+#define KDB_NOTIMP (-7)
+#define KDB_ENVFULL (-8)
+#define KDB_ENVBUFFULL (-9)
+#define KDB_TOOMANYBPT (-10)
+#define KDB_TOOMANYDBREGS (-11)
+#define KDB_DUPBPT (-12)
+#define KDB_BPTNOTFOUND (-13)
+#define KDB_BADMODE (-14)
+#define KDB_BADINT (-15)
+#define KDB_INVADDRFMT (-16)
+#define KDB_BADREG (-17)
+#define KDB_BADCPUNUM (-18)
+#define KDB_BADLENGTH (-19)
+#define KDB_NOBP (-20)
+#define KDB_BADADDR (-21)
+
+/* Kernel Debugger Command codes. Must not overlap with error codes. */
+#define KDB_CMD_GO (-1001)
+#define KDB_CMD_CPU (-1002)
+#define KDB_CMD_SS (-1003)
+#define KDB_CMD_SSB (-1004)
+#define KDB_CMD_KGDB (-1005)
+#define KDB_CMD_KGDB2 (-1006)
+
+/* Internal debug flags */
+#define KDB_DEBUG_FLAG_BP 0x0002 /* Breakpoint subsystem debug */
+#define KDB_DEBUG_FLAG_BB_SUMM 0x0004 /* Basic block analysis, summary only */
+#define KDB_DEBUG_FLAG_AR 0x0008 /* Activation record, generic */
+#define KDB_DEBUG_FLAG_ARA 0x0010 /* Activation record, arch specific */
+#define KDB_DEBUG_FLAG_BB 0x0020 /* All basic block analysis */
+#define KDB_DEBUG_FLAG_STATE 0x0040 /* State flags */
+#define KDB_DEBUG_FLAG_MASK 0xffff /* All debug flags */
+#define KDB_DEBUG_FLAG_SHIFT 16 /* Shift factor for dbflags */
+
+#define KDB_DEBUG(flag) (kdb_flags & \
+ (KDB_DEBUG_FLAG_##flag << KDB_DEBUG_FLAG_SHIFT))
+#define KDB_DEBUG_STATE(text, value) if (KDB_DEBUG(STATE)) \
+ kdb_print_state(text, value)
+
+#if BITS_PER_LONG == 32
+
+#define KDB_PLATFORM_ENV "BYTESPERWORD=4"
+
+#define kdb_machreg_fmt "0x%lx"
+#define kdb_machreg_fmt0 "0x%08lx"
+#define kdb_bfd_vma_fmt "0x%lx"
+#define kdb_bfd_vma_fmt0 "0x%08lx"
+#define kdb_elfw_addr_fmt "0x%x"
+#define kdb_elfw_addr_fmt0 "0x%08x"
+#define kdb_f_count_fmt "%d"
+
+#elif BITS_PER_LONG == 64
+
+#define KDB_PLATFORM_ENV "BYTESPERWORD=8"
+
+#define kdb_machreg_fmt "0x%lx"
+#define kdb_machreg_fmt0 "0x%016lx"
+#define kdb_bfd_vma_fmt "0x%lx"
+#define kdb_bfd_vma_fmt0 "0x%016lx"
+#define kdb_elfw_addr_fmt "0x%x"
+#define kdb_elfw_addr_fmt0 "0x%016x"
+#define kdb_f_count_fmt "%ld"
+
+#endif
+
+/*
+ * KDB_MAXBPT describes the total number of breakpoints
+ * supported by this architecure.
+ */
+#define KDB_MAXBPT 16
+
+/* Maximum number of arguments to a function */
+#define KDB_MAXARGS 16
+
+typedef enum {
+ KDB_REPEAT_NONE = 0, /* Do not repeat this command */
+ KDB_REPEAT_NO_ARGS, /* Repeat the command without arguments */
+ KDB_REPEAT_WITH_ARGS, /* Repeat the command including its arguments */
+} kdb_repeat_t;
+
+typedef int (*kdb_func_t)(int, const char **);
+
+/* Symbol table format returned by kallsyms. */
+typedef struct __ksymtab {
+ unsigned long value; /* Address of symbol */
+ const char *mod_name; /* Module containing symbol or
+ * "kernel" */
+ unsigned long mod_start;
+ unsigned long mod_end;
+ const char *sec_name; /* Section containing symbol */
+ unsigned long sec_start;
+ unsigned long sec_end;
+ const char *sym_name; /* Full symbol name, including
+ * any version */
+ unsigned long sym_start;
+ unsigned long sym_end;
+ } kdb_symtab_t;
+extern int kallsyms_symbol_next(char *prefix_name, int flag);
+extern int kallsyms_symbol_complete(char *prefix_name, int max_len);
+
+/* Exported Symbols for kernel loadable modules to use. */
+extern int kdb_register(char *, kdb_func_t, char *, char *, short);
+extern int kdb_register_repeat(char *, kdb_func_t, char *, char *,
+ short, kdb_repeat_t);
+extern int kdb_unregister(char *);
+
+extern int kdb_getarea_size(void *, unsigned long, size_t);
+extern int kdb_putarea_size(unsigned long, void *, size_t);
+
+/*
+ * Like get_user and put_user, kdb_getarea and kdb_putarea take variable
+ * names, not pointers. The underlying *_size functions take pointers.
+ */
+#define kdb_getarea(x, addr) kdb_getarea_size(&(x), addr, sizeof((x)))
+#define kdb_putarea(addr, x) kdb_putarea_size(addr, &(x), sizeof((x)))
+
+extern int kdb_getphysword(unsigned long *word,
+ unsigned long addr, size_t size);
+extern int kdb_getword(unsigned long *, unsigned long, size_t);
+extern int kdb_putword(unsigned long, unsigned long, size_t);
+
+extern int kdbgetularg(const char *, unsigned long *);
+extern int kdb_set(int, const char **);
+extern char *kdbgetenv(const char *);
+extern int kdbgetintenv(const char *, int *);
+extern int kdbgetaddrarg(int, const char **, int*, unsigned long *,
+ long *, char **);
+extern int kdbgetsymval(const char *, kdb_symtab_t *);
+extern int kdbnearsym(unsigned long, kdb_symtab_t *);
+extern void kdbnearsym_cleanup(void);
+extern char *kdb_strdup(const char *str, gfp_t type);
+extern void kdb_symbol_print(unsigned long, const kdb_symtab_t *, unsigned int);
+
+/* Routine for debugging the debugger state. */
+extern void kdb_print_state(const char *, int);
+
+extern int kdb_state;
+#define KDB_STATE_KDB 0x00000001 /* Cpu is inside kdb */
+#define KDB_STATE_LEAVING 0x00000002 /* Cpu is leaving kdb */
+#define KDB_STATE_CMD 0x00000004 /* Running a kdb command */
+#define KDB_STATE_KDB_CONTROL 0x00000008 /* This cpu is under
+ * kdb control */
+#define KDB_STATE_HOLD_CPU 0x00000010 /* Hold this cpu inside kdb */
+#define KDB_STATE_DOING_SS 0x00000020 /* Doing ss command */
+#define KDB_STATE_DOING_SSB 0x00000040 /* Doing ssb command,
+ * DOING_SS is also set */
+#define KDB_STATE_SSBPT 0x00000080 /* Install breakpoint
+ * after one ss, independent of
+ * DOING_SS */
+#define KDB_STATE_REENTRY 0x00000100 /* Valid re-entry into kdb */
+#define KDB_STATE_SUPPRESS 0x00000200 /* Suppress error messages */
+#define KDB_STATE_PAGER 0x00000400 /* pager is available */
+#define KDB_STATE_GO_SWITCH 0x00000800 /* go is switching
+ * back to initial cpu */
+#define KDB_STATE_PRINTF_LOCK 0x00001000 /* Holds kdb_printf lock */
+#define KDB_STATE_WAIT_IPI 0x00002000 /* Waiting for kdb_ipi() NMI */
+#define KDB_STATE_RECURSE 0x00004000 /* Recursive entry to kdb */
+#define KDB_STATE_IP_ADJUSTED 0x00008000 /* Restart IP has been
+ * adjusted */
+#define KDB_STATE_GO1 0x00010000 /* go only releases one cpu */
+#define KDB_STATE_KEYBOARD 0x00020000 /* kdb entered via
+ * keyboard on this cpu */
+#define KDB_STATE_KEXEC 0x00040000 /* kexec issued */
+#define KDB_STATE_DOING_KGDB 0x00080000 /* kgdb enter now issued */
+#define KDB_STATE_DOING_KGDB2 0x00100000 /* kgdb enter now issued */
+#define KDB_STATE_KGDB_TRANS 0x00200000 /* Transition to kgdb */
+#define KDB_STATE_ARCH 0xff000000 /* Reserved for arch
+ * specific use */
+
+#define KDB_STATE(flag) (kdb_state & KDB_STATE_##flag)
+#define KDB_STATE_SET(flag) ((void)(kdb_state |= KDB_STATE_##flag))
+#define KDB_STATE_CLEAR(flag) ((void)(kdb_state &= ~KDB_STATE_##flag))
+
+extern int kdb_nextline; /* Current number of lines displayed */
+
+typedef struct _kdb_bp {
+ unsigned long bp_addr; /* Address breakpoint is present at */
+ unsigned int bp_free:1; /* This entry is available */
+ unsigned int bp_enabled:1; /* Breakpoint is active in register */
+ unsigned int bp_type:4; /* Uses hardware register */
+ unsigned int bp_installed:1; /* Breakpoint is installed */
+ unsigned int bp_delay:1; /* Do delayed bp handling */
+ unsigned int bp_delayed:1; /* Delayed breakpoint */
+ unsigned int bph_length; /* HW break length */
+} kdb_bp_t;
+
+#ifdef CONFIG_KGDB_KDB
+extern kdb_bp_t kdb_breakpoints[/* KDB_MAXBPT */];
+
+/* The KDB shell command table */
+typedef struct _kdbtab {
+ char *cmd_name; /* Command name */
+ kdb_func_t cmd_func; /* Function to execute command */
+ char *cmd_usage; /* Usage String for this command */
+ char *cmd_help; /* Help message for this command */
+ short cmd_flags; /* Parsing flags */
+ short cmd_minlen; /* Minimum legal # command
+ * chars required */
+ kdb_repeat_t cmd_repeat; /* Does command auto repeat on enter? */
+} kdbtab_t;
+
+extern int kdb_bt(int, const char **); /* KDB display back trace */
+
+/* KDB breakpoint management functions */
+extern void kdb_initbptab(void);
+extern void kdb_bp_install(struct pt_regs *);
+extern void kdb_bp_remove(void);
+
+typedef enum {
+ KDB_DB_BPT, /* Breakpoint */
+ KDB_DB_SS, /* Single-step trap */
+ KDB_DB_SSB, /* Single step to branch */
+ KDB_DB_SSBPT, /* Single step over breakpoint */
+ KDB_DB_NOBPT /* Spurious breakpoint */
+} kdb_dbtrap_t;
+
+extern int kdb_main_loop(kdb_reason_t, kdb_reason_t,
+ int, kdb_dbtrap_t, struct pt_regs *);
+
+/* Miscellaneous functions and data areas */
+extern int kdb_grepping_flag;
+extern char kdb_grep_string[];
+extern int kdb_grep_leading;
+extern int kdb_grep_trailing;
+extern char *kdb_cmds[];
+extern void kdb_syslog_data(char *syslog_data[]);
+extern unsigned long kdb_task_state_string(const char *);
+extern char kdb_task_state_char (const struct task_struct *);
+extern unsigned long kdb_task_state(const struct task_struct *p,
+ unsigned long mask);
+extern void kdb_ps_suppressed(void);
+extern void kdb_ps1(const struct task_struct *p);
+extern int kdb_parse(const char *cmdstr);
+extern void kdb_print_nameval(const char *name, unsigned long val);
+extern void kdb_send_sig_info(struct task_struct *p, struct siginfo *info);
+extern void kdb_meminfo_proc_show(void);
+extern const char *kdb_walk_kallsyms(loff_t *pos);
+extern char *kdb_getstr(char *, size_t, char *);
+
+/* Defines for kdb_symbol_print */
+#define KDB_SP_SPACEB 0x0001 /* Space before string */
+#define KDB_SP_SPACEA 0x0002 /* Space after string */
+#define KDB_SP_PAREN 0x0004 /* Parenthesis around string */
+#define KDB_SP_VALUE 0x0008 /* Print the value of the address */
+#define KDB_SP_SYMSIZE 0x0010 /* Print the size of the symbol */
+#define KDB_SP_NEWLINE 0x0020 /* Newline after string */
+#define KDB_SP_DEFAULT (KDB_SP_VALUE|KDB_SP_PAREN)
+
+#define KDB_TSK(cpu) kgdb_info[cpu].task
+#define KDB_TSKREGS(cpu) kgdb_info[cpu].debuggerinfo
+
+extern struct task_struct *kdb_curr_task(int);
+
+#define kdb_task_has_cpu(p) (task_curr(p))
+
+/* Simplify coexistence with NPTL */
+#define kdb_do_each_thread(g, p) do_each_thread(g, p)
+#define kdb_while_each_thread(g, p) while_each_thread(g, p)
+
+#define GFP_KDB (in_interrupt() ? GFP_ATOMIC : GFP_KERNEL)
+
+extern void *debug_kmalloc(size_t size, gfp_t flags);
+extern void debug_kfree(void *);
+extern void debug_kusage(void);
+
+extern void kdb_set_current_task(struct task_struct *);
+extern struct task_struct *kdb_current_task;
+#ifdef CONFIG_MODULES
+extern struct list_head *kdb_modules;
+#endif /* CONFIG_MODULES */
+
+extern char kdb_prompt_str[];
+
+#define KDB_WORD_SIZE ((int)sizeof(unsigned long))
+
+#endif /* CONFIG_KGDB_KDB */
+#endif /* !_KDBPRIVATE_H */
--- /dev/null
+/*
+ * Kernel Debugger Architecture Independent Support Functions
+ *
+ * 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) 2009 Wind River Systems, Inc. All Rights Reserved.
+ * 03/02/13 added new 2.5 kallsyms <xavier.bru@bull.net>
+ */
+
+#include <stdarg.h>
+#include <linux/types.h>
+#include <linux/sched.h>
+#include <linux/mm.h>
+#include <linux/kallsyms.h>
+#include <linux/stddef.h>
+#include <linux/vmalloc.h>
+#include <linux/ptrace.h>
+#include <linux/module.h>
+#include <linux/highmem.h>
+#include <linux/hardirq.h>
+#include <linux/delay.h>
+#include <linux/uaccess.h>
+#include <linux/kdb.h>
+#include <linux/slab.h>
+#include "kdb_private.h"
+
+/*
+ * kdbgetsymval - Return the address of the given symbol.
+ *
+ * Parameters:
+ * symname Character string containing symbol name
+ * symtab Structure to receive results
+ * Returns:
+ * 0 Symbol not found, symtab zero filled
+ * 1 Symbol mapped to module/symbol/section, data in symtab
+ */
+int kdbgetsymval(const char *symname, kdb_symtab_t *symtab)
+{
+ if (KDB_DEBUG(AR))
+ kdb_printf("kdbgetsymval: symname=%s, symtab=%p\n", symname,
+ symtab);
+ memset(symtab, 0, sizeof(*symtab));
+ symtab->sym_start = kallsyms_lookup_name(symname);
+ if (symtab->sym_start) {
+ if (KDB_DEBUG(AR))
+ kdb_printf("kdbgetsymval: returns 1, "
+ "symtab->sym_start=0x%lx\n",
+ symtab->sym_start);
+ return 1;
+ }
+ if (KDB_DEBUG(AR))
+ kdb_printf("kdbgetsymval: returns 0\n");
+ return 0;
+}
+EXPORT_SYMBOL(kdbgetsymval);
+
+static char *kdb_name_table[100]; /* arbitrary size */
+
+/*
+ * kdbnearsym - Return the name of the symbol with the nearest address
+ * less than 'addr'.
+ *
+ * Parameters:
+ * addr Address to check for symbol near
+ * symtab Structure to receive results
+ * Returns:
+ * 0 No sections contain this address, symtab zero filled
+ * 1 Address mapped to module/symbol/section, data in symtab
+ * Remarks:
+ * 2.6 kallsyms has a "feature" where it unpacks the name into a
+ * string. If that string is reused before the caller expects it
+ * then the caller sees its string change without warning. To
+ * avoid cluttering up the main kdb code with lots of kdb_strdup,
+ * tests and kfree calls, kdbnearsym maintains an LRU list of the
+ * last few unique strings. The list is sized large enough to
+ * hold active strings, no kdb caller of kdbnearsym makes more
+ * than ~20 later calls before using a saved value.
+ */
+int kdbnearsym(unsigned long addr, kdb_symtab_t *symtab)
+{
+ int ret = 0;
+ unsigned long symbolsize;
+ unsigned long offset;
+#define knt1_size 128 /* must be >= kallsyms table size */
+ char *knt1 = NULL;
+
+ if (KDB_DEBUG(AR))
+ kdb_printf("kdbnearsym: addr=0x%lx, symtab=%p\n", addr, symtab);
+ memset(symtab, 0, sizeof(*symtab));
+
+ if (addr < 4096)
+ goto out;
+ knt1 = debug_kmalloc(knt1_size, GFP_ATOMIC);
+ if (!knt1) {
+ kdb_printf("kdbnearsym: addr=0x%lx cannot kmalloc knt1\n",
+ addr);
+ goto out;
+ }
+ symtab->sym_name = kallsyms_lookup(addr, &symbolsize , &offset,
+ (char **)(&symtab->mod_name), knt1);
+ if (offset > 8*1024*1024) {
+ symtab->sym_name = NULL;
+ addr = offset = symbolsize = 0;
+ }
+ symtab->sym_start = addr - offset;
+ symtab->sym_end = symtab->sym_start + symbolsize;
+ ret = symtab->sym_name != NULL && *(symtab->sym_name) != '\0';
+
+ if (ret) {
+ int i;
+ /* Another 2.6 kallsyms "feature". Sometimes the sym_name is
+ * set but the buffer passed into kallsyms_lookup is not used,
+ * so it contains garbage. The caller has to work out which
+ * buffer needs to be saved.
+ *
+ * What was Rusty smoking when he wrote that code?
+ */
+ if (symtab->sym_name != knt1) {
+ strncpy(knt1, symtab->sym_name, knt1_size);
+ knt1[knt1_size-1] = '\0';
+ }
+ for (i = 0; i < ARRAY_SIZE(kdb_name_table); ++i) {
+ if (kdb_name_table[i] &&
+ strcmp(kdb_name_table[i], knt1) == 0)
+ break;
+ }
+ if (i >= ARRAY_SIZE(kdb_name_table)) {
+ debug_kfree(kdb_name_table[0]);
+ memcpy(kdb_name_table, kdb_name_table+1,
+ sizeof(kdb_name_table[0]) *
+ (ARRAY_SIZE(kdb_name_table)-1));
+ } else {
+ debug_kfree(knt1);
+ knt1 = kdb_name_table[i];
+ memcpy(kdb_name_table+i, kdb_name_table+i+1,
+ sizeof(kdb_name_table[0]) *
+ (ARRAY_SIZE(kdb_name_table)-i-1));
+ }
+ i = ARRAY_SIZE(kdb_name_table) - 1;
+ kdb_name_table[i] = knt1;
+ symtab->sym_name = kdb_name_table[i];
+ knt1 = NULL;
+ }
+
+ if (symtab->mod_name == NULL)
+ symtab->mod_name = "kernel";
+ if (KDB_DEBUG(AR))
+ kdb_printf("kdbnearsym: returns %d symtab->sym_start=0x%lx, "
+ "symtab->mod_name=%p, symtab->sym_name=%p (%s)\n", ret,
+ symtab->sym_start, symtab->mod_name, symtab->sym_name,
+ symtab->sym_name);
+
+out:
+ debug_kfree(knt1);
+ return ret;
+}
+
+void kdbnearsym_cleanup(void)
+{
+ int i;
+ for (i = 0; i < ARRAY_SIZE(kdb_name_table); ++i) {
+ if (kdb_name_table[i]) {
+ debug_kfree(kdb_name_table[i]);
+ kdb_name_table[i] = NULL;
+ }
+ }
+}
+
+static char ks_namebuf[KSYM_NAME_LEN+1], ks_namebuf_prev[KSYM_NAME_LEN+1];
+
+/*
+ * kallsyms_symbol_complete
+ *
+ * Parameters:
+ * prefix_name prefix of a symbol name to lookup
+ * max_len maximum length that can be returned
+ * Returns:
+ * Number of symbols which match the given prefix.
+ * Notes:
+ * prefix_name is changed to contain the longest unique prefix that
+ * starts with this prefix (tab completion).
+ */
+int kallsyms_symbol_complete(char *prefix_name, int max_len)
+{
+ loff_t pos = 0;
+ int prefix_len = strlen(prefix_name), prev_len = 0;
+ int i, number = 0;
+ const char *name;
+
+ while ((name = kdb_walk_kallsyms(&pos))) {
+ if (strncmp(name, prefix_name, prefix_len) == 0) {
+ strcpy(ks_namebuf, name);
+ /* Work out the longest name that matches the prefix */
+ if (++number == 1) {
+ prev_len = min_t(int, max_len-1,
+ strlen(ks_namebuf));
+ memcpy(ks_namebuf_prev, ks_namebuf, prev_len);
+ ks_namebuf_prev[prev_len] = '\0';
+ continue;
+ }
+ for (i = 0; i < prev_len; i++) {
+ if (ks_namebuf[i] != ks_namebuf_prev[i]) {
+ prev_len = i;
+ ks_namebuf_prev[i] = '\0';
+ break;
+ }
+ }
+ }
+ }
+ if (prev_len > prefix_len)
+ memcpy(prefix_name, ks_namebuf_prev, prev_len+1);
+ return number;
+}
+
+/*
+ * kallsyms_symbol_next
+ *
+ * Parameters:
+ * prefix_name prefix of a symbol name to lookup
+ * flag 0 means search from the head, 1 means continue search.
+ * Returns:
+ * 1 if a symbol matches the given prefix.
+ * 0 if no string found
+ */
+int kallsyms_symbol_next(char *prefix_name, int flag)
+{
+ int prefix_len = strlen(prefix_name);
+ static loff_t pos;
+ const char *name;
+
+ if (!flag)
+ pos = 0;
+
+ while ((name = kdb_walk_kallsyms(&pos))) {
+ if (strncmp(name, prefix_name, prefix_len) == 0) {
+ strncpy(prefix_name, name, strlen(name)+1);
+ return 1;
+ }
+ }
+ return 0;
+}
+
+/*
+ * kdb_symbol_print - Standard method for printing a symbol name and offset.
+ * Inputs:
+ * addr Address to be printed.
+ * symtab Address of symbol data, if NULL this routine does its
+ * own lookup.
+ * punc Punctuation for string, bit field.
+ * Remarks:
+ * The string and its punctuation is only printed if the address
+ * is inside the kernel, except that the value is always printed
+ * when requested.
+ */
+void kdb_symbol_print(unsigned long addr, const kdb_symtab_t *symtab_p,
+ unsigned int punc)
+{
+ kdb_symtab_t symtab, *symtab_p2;
+ if (symtab_p) {
+ symtab_p2 = (kdb_symtab_t *)symtab_p;
+ } else {
+ symtab_p2 = &symtab;
+ kdbnearsym(addr, symtab_p2);
+ }
+ if (!(symtab_p2->sym_name || (punc & KDB_SP_VALUE)))
+ return;
+ if (punc & KDB_SP_SPACEB)
+ kdb_printf(" ");
+ if (punc & KDB_SP_VALUE)
+ kdb_printf(kdb_machreg_fmt0, addr);
+ if (symtab_p2->sym_name) {
+ if (punc & KDB_SP_VALUE)
+ kdb_printf(" ");
+ if (punc & KDB_SP_PAREN)
+ kdb_printf("(");
+ if (strcmp(symtab_p2->mod_name, "kernel"))
+ kdb_printf("[%s]", symtab_p2->mod_name);
+ kdb_printf("%s", symtab_p2->sym_name);
+ if (addr != symtab_p2->sym_start)
+ kdb_printf("+0x%lx", addr - symtab_p2->sym_start);
+ if (punc & KDB_SP_SYMSIZE)
+ kdb_printf("/0x%lx",
+ symtab_p2->sym_end - symtab_p2->sym_start);
+ if (punc & KDB_SP_PAREN)
+ kdb_printf(")");
+ }
+ if (punc & KDB_SP_SPACEA)
+ kdb_printf(" ");
+ if (punc & KDB_SP_NEWLINE)
+ kdb_printf("\n");
+}
+
+/*
+ * kdb_strdup - kdb equivalent of strdup, for disasm code.
+ * Inputs:
+ * str The string to duplicate.
+ * type Flags to kmalloc for the new string.
+ * Returns:
+ * Address of the new string, NULL if storage could not be allocated.
+ * Remarks:
+ * This is not in lib/string.c because it uses kmalloc which is not
+ * available when string.o is used in boot loaders.
+ */
+char *kdb_strdup(const char *str, gfp_t type)
+{
+ int n = strlen(str)+1;
+ char *s = kmalloc(n, type);
+ if (!s)
+ return NULL;
+ return strcpy(s, str);
+}
+
+/*
+ * kdb_getarea_size - Read an area of data. The kdb equivalent of
+ * copy_from_user, with kdb messages for invalid addresses.
+ * Inputs:
+ * res Pointer to the area to receive the result.
+ * addr Address of the area to copy.
+ * size Size of the area.
+ * Returns:
+ * 0 for success, < 0 for error.
+ */
+int kdb_getarea_size(void *res, unsigned long addr, size_t size)
+{
+ int ret = probe_kernel_read((char *)res, (char *)addr, size);
+ if (ret) {
+ if (!KDB_STATE(SUPPRESS)) {
+ kdb_printf("kdb_getarea: Bad address 0x%lx\n", addr);
+ KDB_STATE_SET(SUPPRESS);
+ }
+ ret = KDB_BADADDR;
+ } else {
+ KDB_STATE_CLEAR(SUPPRESS);
+ }
+ return ret;
+}
+
+/*
+ * kdb_putarea_size - Write an area of data. The kdb equivalent of
+ * copy_to_user, with kdb messages for invalid addresses.
+ * Inputs:
+ * addr Address of the area to write to.
+ * res Pointer to the area holding the data.
+ * size Size of the area.
+ * Returns:
+ * 0 for success, < 0 for error.
+ */
+int kdb_putarea_size(unsigned long addr, void *res, size_t size)
+{
+ int ret = probe_kernel_read((char *)addr, (char *)res, size);
+ if (ret) {
+ if (!KDB_STATE(SUPPRESS)) {
+ kdb_printf("kdb_putarea: Bad address 0x%lx\n", addr);
+ KDB_STATE_SET(SUPPRESS);
+ }
+ ret = KDB_BADADDR;
+ } else {
+ KDB_STATE_CLEAR(SUPPRESS);
+ }
+ return ret;
+}
+
+/*
+ * kdb_getphys - Read data from a physical address. Validate the
+ * address is in range, use kmap_atomic() to get data
+ * similar to kdb_getarea() - but for phys addresses
+ * Inputs:
+ * res Pointer to the word to receive the result
+ * addr Physical address of the area to copy
+ * size Size of the area
+ * Returns:
+ * 0 for success, < 0 for error.
+ */
+static int kdb_getphys(void *res, unsigned long addr, size_t size)
+{
+ unsigned long pfn;
+ void *vaddr;
+ struct page *page;
+
+ pfn = (addr >> PAGE_SHIFT);
+ if (!pfn_valid(pfn))
+ return 1;
+ page = pfn_to_page(pfn);
+ vaddr = kmap_atomic(page, KM_KDB);
+ memcpy(res, vaddr + (addr & (PAGE_SIZE - 1)), size);
+ kunmap_atomic(vaddr, KM_KDB);
+
+ return 0;
+}
+
+/*
+ * kdb_getphysword
+ * Inputs:
+ * word Pointer to the word to receive the result.
+ * addr Address of the area to copy.
+ * size Size of the area.
+ * Returns:
+ * 0 for success, < 0 for error.
+ */
+int kdb_getphysword(unsigned long *word, unsigned long addr, size_t size)
+{
+ int diag;
+ __u8 w1;
+ __u16 w2;
+ __u32 w4;
+ __u64 w8;
+ *word = 0; /* Default value if addr or size is invalid */
+
+ switch (size) {
+ case 1:
+ diag = kdb_getphys(&w1, addr, sizeof(w1));
+ if (!diag)
+ *word = w1;
+ break;
+ case 2:
+ diag = kdb_getphys(&w2, addr, sizeof(w2));
+ if (!diag)
+ *word = w2;
+ break;
+ case 4:
+ diag = kdb_getphys(&w4, addr, sizeof(w4));
+ if (!diag)
+ *word = w4;
+ break;
+ case 8:
+ if (size <= sizeof(*word)) {
+ diag = kdb_getphys(&w8, addr, sizeof(w8));
+ if (!diag)
+ *word = w8;
+ break;
+ }
+ /* drop through */
+ default:
+ diag = KDB_BADWIDTH;
+ kdb_printf("kdb_getphysword: bad width %ld\n", (long) size);
+ }
+ return diag;
+}
+
+/*
+ * kdb_getword - Read a binary value. Unlike kdb_getarea, this treats
+ * data as numbers.
+ * Inputs:
+ * word Pointer to the word to receive the result.
+ * addr Address of the area to copy.
+ * size Size of the area.
+ * Returns:
+ * 0 for success, < 0 for error.
+ */
+int kdb_getword(unsigned long *word, unsigned long addr, size_t size)
+{
+ int diag;
+ __u8 w1;
+ __u16 w2;
+ __u32 w4;
+ __u64 w8;
+ *word = 0; /* Default value if addr or size is invalid */
+ switch (size) {
+ case 1:
+ diag = kdb_getarea(w1, addr);
+ if (!diag)
+ *word = w1;
+ break;
+ case 2:
+ diag = kdb_getarea(w2, addr);
+ if (!diag)
+ *word = w2;
+ break;
+ case 4:
+ diag = kdb_getarea(w4, addr);
+ if (!diag)
+ *word = w4;
+ break;
+ case 8:
+ if (size <= sizeof(*word)) {
+ diag = kdb_getarea(w8, addr);
+ if (!diag)
+ *word = w8;
+ break;
+ }
+ /* drop through */
+ default:
+ diag = KDB_BADWIDTH;
+ kdb_printf("kdb_getword: bad width %ld\n", (long) size);
+ }
+ return diag;
+}
+
+/*
+ * kdb_putword - Write a binary value. Unlike kdb_putarea, this
+ * treats data as numbers.
+ * Inputs:
+ * addr Address of the area to write to..
+ * word The value to set.
+ * size Size of the area.
+ * Returns:
+ * 0 for success, < 0 for error.
+ */
+int kdb_putword(unsigned long addr, unsigned long word, size_t size)
+{
+ int diag;
+ __u8 w1;
+ __u16 w2;
+ __u32 w4;
+ __u64 w8;
+ switch (size) {
+ case 1:
+ w1 = word;
+ diag = kdb_putarea(addr, w1);
+ break;
+ case 2:
+ w2 = word;
+ diag = kdb_putarea(addr, w2);
+ break;
+ case 4:
+ w4 = word;
+ diag = kdb_putarea(addr, w4);
+ break;
+ case 8:
+ if (size <= sizeof(word)) {
+ w8 = word;
+ diag = kdb_putarea(addr, w8);
+ break;
+ }
+ /* drop through */
+ default:
+ diag = KDB_BADWIDTH;
+ kdb_printf("kdb_putword: bad width %ld\n", (long) size);
+ }
+ return diag;
+}
+
+/*
+ * kdb_task_state_string - Convert a string containing any of the
+ * letters DRSTCZEUIMA to a mask for the process state field and
+ * return the value. If no argument is supplied, return the mask
+ * that corresponds to environment variable PS, DRSTCZEU by
+ * default.
+ * Inputs:
+ * s String to convert
+ * Returns:
+ * Mask for process state.
+ * Notes:
+ * The mask folds data from several sources into a single long value, so
+ * be carefull not to overlap the bits. TASK_* bits are in the LSB,
+ * special cases like UNRUNNABLE are in the MSB. As of 2.6.10-rc1 there
+ * is no overlap between TASK_* and EXIT_* but that may not always be
+ * true, so EXIT_* bits are shifted left 16 bits before being stored in
+ * the mask.
+ */
+
+/* unrunnable is < 0 */
+#define UNRUNNABLE (1UL << (8*sizeof(unsigned long) - 1))
+#define RUNNING (1UL << (8*sizeof(unsigned long) - 2))
+#define IDLE (1UL << (8*sizeof(unsigned long) - 3))
+#define DAEMON (1UL << (8*sizeof(unsigned long) - 4))
+
+unsigned long kdb_task_state_string(const char *s)
+{
+ long res = 0;
+ if (!s) {
+ s = kdbgetenv("PS");
+ if (!s)
+ s = "DRSTCZEU"; /* default value for ps */
+ }
+ while (*s) {
+ switch (*s) {
+ case 'D':
+ res |= TASK_UNINTERRUPTIBLE;
+ break;
+ case 'R':
+ res |= RUNNING;
+ break;
+ case 'S':
+ res |= TASK_INTERRUPTIBLE;
+ break;
+ case 'T':
+ res |= TASK_STOPPED;
+ break;
+ case 'C':
+ res |= TASK_TRACED;
+ break;
+ case 'Z':
+ res |= EXIT_ZOMBIE << 16;
+ break;
+ case 'E':
+ res |= EXIT_DEAD << 16;
+ break;
+ case 'U':
+ res |= UNRUNNABLE;
+ break;
+ case 'I':
+ res |= IDLE;
+ break;
+ case 'M':
+ res |= DAEMON;
+ break;
+ case 'A':
+ res = ~0UL;
+ break;
+ default:
+ kdb_printf("%s: unknown flag '%c' ignored\n",
+ __func__, *s);
+ break;
+ }
+ ++s;
+ }
+ return res;
+}
+
+/*
+ * kdb_task_state_char - Return the character that represents the task state.
+ * Inputs:
+ * p struct task for the process
+ * Returns:
+ * One character to represent the task state.
+ */
+char kdb_task_state_char (const struct task_struct *p)
+{
+ int cpu;
+ char state;
+ unsigned long tmp;
+
+ if (!p || probe_kernel_read(&tmp, (char *)p, sizeof(unsigned long)))
+ return 'E';
+
+ cpu = kdb_process_cpu(p);
+ state = (p->state == 0) ? 'R' :
+ (p->state < 0) ? 'U' :
+ (p->state & TASK_UNINTERRUPTIBLE) ? 'D' :
+ (p->state & TASK_STOPPED) ? 'T' :
+ (p->state & TASK_TRACED) ? 'C' :
+ (p->exit_state & EXIT_ZOMBIE) ? 'Z' :
+ (p->exit_state & EXIT_DEAD) ? 'E' :
+ (p->state & TASK_INTERRUPTIBLE) ? 'S' : '?';
+ if (p->pid == 0) {
+ /* Idle task. Is it really idle, apart from the kdb
+ * interrupt? */
+ if (!kdb_task_has_cpu(p) || kgdb_info[cpu].irq_depth == 1) {
+ if (cpu != kdb_initial_cpu)
+ state = 'I'; /* idle task */
+ }
+ } else if (!p->mm && state == 'S') {
+ state = 'M'; /* sleeping system daemon */
+ }
+ return state;
+}
+
+/*
+ * kdb_task_state - Return true if a process has the desired state
+ * given by the mask.
+ * Inputs:
+ * p struct task for the process
+ * mask mask from kdb_task_state_string to select processes
+ * Returns:
+ * True if the process matches at least one criteria defined by the mask.
+ */
+unsigned long kdb_task_state(const struct task_struct *p, unsigned long mask)
+{
+ char state[] = { kdb_task_state_char(p), '\0' };
+ return (mask & kdb_task_state_string(state)) != 0;
+}
+
+/*
+ * kdb_print_nameval - Print a name and its value, converting the
+ * value to a symbol lookup if possible.
+ * Inputs:
+ * name field name to print
+ * val value of field
+ */
+void kdb_print_nameval(const char *name, unsigned long val)
+{
+ kdb_symtab_t symtab;
+ kdb_printf(" %-11.11s ", name);
+ if (kdbnearsym(val, &symtab))
+ kdb_symbol_print(val, &symtab,
+ KDB_SP_VALUE|KDB_SP_SYMSIZE|KDB_SP_NEWLINE);
+ else
+ kdb_printf("0x%lx\n", val);
+}
+
+/* Last ditch allocator for debugging, so we can still debug even when
+ * the GFP_ATOMIC pool has been exhausted. The algorithms are tuned
+ * for space usage, not for speed. One smallish memory pool, the free
+ * chain is always in ascending address order to allow coalescing,
+ * allocations are done in brute force best fit.
+ */
+
+struct debug_alloc_header {
+ u32 next; /* offset of next header from start of pool */
+ u32 size;
+ void *caller;
+};
+
+/* The memory returned by this allocator must be aligned, which means
+ * so must the header size. Do not assume that sizeof(struct
+ * debug_alloc_header) is a multiple of the alignment, explicitly
+ * calculate the overhead of this header, including the alignment.
+ * The rest of this code must not use sizeof() on any header or
+ * pointer to a header.
+ */
+#define dah_align 8
+#define dah_overhead ALIGN(sizeof(struct debug_alloc_header), dah_align)
+
+static u64 debug_alloc_pool_aligned[256*1024/dah_align]; /* 256K pool */
+static char *debug_alloc_pool = (char *)debug_alloc_pool_aligned;
+static u32 dah_first, dah_first_call = 1, dah_used, dah_used_max;
+
+/* Locking is awkward. The debug code is called from all contexts,
+ * including non maskable interrupts. A normal spinlock is not safe
+ * in NMI context. Try to get the debug allocator lock, if it cannot
+ * be obtained after a second then give up. If the lock could not be
+ * previously obtained on this cpu then only try once.
+ *
+ * sparse has no annotation for "this function _sometimes_ acquires a
+ * lock", so fudge the acquire/release notation.
+ */
+static DEFINE_SPINLOCK(dap_lock);
+static int get_dap_lock(void)
+ __acquires(dap_lock)
+{
+ static int dap_locked = -1;
+ int count;
+ if (dap_locked == smp_processor_id())
+ count = 1;
+ else
+ count = 1000;
+ while (1) {
+ if (spin_trylock(&dap_lock)) {
+ dap_locked = -1;
+ return 1;
+ }
+ if (!count--)
+ break;
+ udelay(1000);
+ }
+ dap_locked = smp_processor_id();
+ __acquire(dap_lock);
+ return 0;
+}
+
+void *debug_kmalloc(size_t size, gfp_t flags)
+{
+ unsigned int rem, h_offset;
+ struct debug_alloc_header *best, *bestprev, *prev, *h;
+ void *p = NULL;
+ if (!get_dap_lock()) {
+ __release(dap_lock); /* we never actually got it */
+ return NULL;
+ }
+ h = (struct debug_alloc_header *)(debug_alloc_pool + dah_first);
+ if (dah_first_call) {
+ h->size = sizeof(debug_alloc_pool_aligned) - dah_overhead;
+ dah_first_call = 0;
+ }
+ size = ALIGN(size, dah_align);
+ prev = best = bestprev = NULL;
+ while (1) {
+ if (h->size >= size && (!best || h->size < best->size)) {
+ best = h;
+ bestprev = prev;
+ if (h->size == size)
+ break;
+ }
+ if (!h->next)
+ break;
+ prev = h;
+ h = (struct debug_alloc_header *)(debug_alloc_pool + h->next);
+ }
+ if (!best)
+ goto out;
+ rem = best->size - size;
+ /* The pool must always contain at least one header */
+ if (best->next == 0 && bestprev == NULL && rem < dah_overhead)
+ goto out;
+ if (rem >= dah_overhead) {
+ best->size = size;
+ h_offset = ((char *)best - debug_alloc_pool) +
+ dah_overhead + best->size;
+ h = (struct debug_alloc_header *)(debug_alloc_pool + h_offset);
+ h->size = rem - dah_overhead;
+ h->next = best->next;
+ } else
+ h_offset = best->next;
+ best->caller = __builtin_return_address(0);
+ dah_used += best->size;
+ dah_used_max = max(dah_used, dah_used_max);
+ if (bestprev)
+ bestprev->next = h_offset;
+ else
+ dah_first = h_offset;
+ p = (char *)best + dah_overhead;
+ memset(p, POISON_INUSE, best->size - 1);
+ *((char *)p + best->size - 1) = POISON_END;
+out:
+ spin_unlock(&dap_lock);
+ return p;
+}
+
+void debug_kfree(void *p)
+{
+ struct debug_alloc_header *h;
+ unsigned int h_offset;
+ if (!p)
+ return;
+ if ((char *)p < debug_alloc_pool ||
+ (char *)p >= debug_alloc_pool + sizeof(debug_alloc_pool_aligned)) {
+ kfree(p);
+ return;
+ }
+ if (!get_dap_lock()) {
+ __release(dap_lock); /* we never actually got it */
+ return; /* memory leak, cannot be helped */
+ }
+ h = (struct debug_alloc_header *)((char *)p - dah_overhead);
+ memset(p, POISON_FREE, h->size - 1);
+ *((char *)p + h->size - 1) = POISON_END;
+ h->caller = NULL;
+ dah_used -= h->size;
+ h_offset = (char *)h - debug_alloc_pool;
+ if (h_offset < dah_first) {
+ h->next = dah_first;
+ dah_first = h_offset;
+ } else {
+ struct debug_alloc_header *prev;
+ unsigned int prev_offset;
+ prev = (struct debug_alloc_header *)(debug_alloc_pool +
+ dah_first);
+ while (1) {
+ if (!prev->next || prev->next > h_offset)
+ break;
+ prev = (struct debug_alloc_header *)
+ (debug_alloc_pool + prev->next);
+ }
+ prev_offset = (char *)prev - debug_alloc_pool;
+ if (prev_offset + dah_overhead + prev->size == h_offset) {
+ prev->size += dah_overhead + h->size;
+ memset(h, POISON_FREE, dah_overhead - 1);
+ *((char *)h + dah_overhead - 1) = POISON_END;
+ h = prev;
+ h_offset = prev_offset;
+ } else {
+ h->next = prev->next;
+ prev->next = h_offset;
+ }
+ }
+ if (h_offset + dah_overhead + h->size == h->next) {
+ struct debug_alloc_header *next;
+ next = (struct debug_alloc_header *)
+ (debug_alloc_pool + h->next);
+ h->size += dah_overhead + next->size;
+ h->next = next->next;
+ memset(next, POISON_FREE, dah_overhead - 1);
+ *((char *)next + dah_overhead - 1) = POISON_END;
+ }
+ spin_unlock(&dap_lock);
+}
+
+void debug_kusage(void)
+{
+ struct debug_alloc_header *h_free, *h_used;
+#ifdef CONFIG_IA64
+ /* FIXME: using dah for ia64 unwind always results in a memory leak.
+ * Fix that memory leak first, then set debug_kusage_one_time = 1 for
+ * all architectures.
+ */
+ static int debug_kusage_one_time;
+#else
+ static int debug_kusage_one_time = 1;
+#endif
+ if (!get_dap_lock()) {
+ __release(dap_lock); /* we never actually got it */
+ return;
+ }
+ h_free = (struct debug_alloc_header *)(debug_alloc_pool + dah_first);
+ if (dah_first == 0 &&
+ (h_free->size == sizeof(debug_alloc_pool_aligned) - dah_overhead ||
+ dah_first_call))
+ goto out;
+ if (!debug_kusage_one_time)
+ goto out;
+ debug_kusage_one_time = 0;
+ kdb_printf("%s: debug_kmalloc memory leak dah_first %d\n",
+ __func__, dah_first);
+ if (dah_first) {
+ h_used = (struct debug_alloc_header *)debug_alloc_pool;
+ kdb_printf("%s: h_used %p size %d\n", __func__, h_used,
+ h_used->size);
+ }
+ do {
+ h_used = (struct debug_alloc_header *)
+ ((char *)h_free + dah_overhead + h_free->size);
+ kdb_printf("%s: h_used %p size %d caller %p\n",
+ __func__, h_used, h_used->size, h_used->caller);
+ h_free = (struct debug_alloc_header *)
+ (debug_alloc_pool + h_free->next);
+ } while (h_free->next);
+ h_used = (struct debug_alloc_header *)
+ ((char *)h_free + dah_overhead + h_free->size);
+ if ((char *)h_used - debug_alloc_pool !=
+ sizeof(debug_alloc_pool_aligned))
+ kdb_printf("%s: h_used %p size %d caller %p\n",
+ __func__, h_used, h_used->size, h_used->caller);
+out:
+ spin_unlock(&dap_lock);
+}
+
+/* Maintain a small stack of kdb_flags to allow recursion without disturbing
+ * the global kdb state.
+ */
+
+static int kdb_flags_stack[4], kdb_flags_index;
+
+void kdb_save_flags(void)
+{
+ BUG_ON(kdb_flags_index >= ARRAY_SIZE(kdb_flags_stack));
+ kdb_flags_stack[kdb_flags_index++] = kdb_flags;
+}
+
+void kdb_restore_flags(void)
+{
+ BUG_ON(kdb_flags_index <= 0);
+ kdb_flags = kdb_flags_stack[--kdb_flags_index];
+}
projects / nvme.git / commitdiff