linux/kernel/debug/kdb/kdb_bp.c

/*
 * 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)
{ … }

static char *kdb_rwtypes[] = …;

static char *kdb_bptype(kdb_bp_t *bp)
{ … }

static int kdb_parsebp(int argc, const char **argv, int *nextargp, kdb_bp_t *bp)
{ … }

static int _kdb_bp_remove(kdb_bp_t *bp)
{ … }

static void kdb_handle_bp(struct pt_regs *regs, kdb_bp_t *bp)
{ … }

static int _kdb_bp_install(struct pt_regs *regs, kdb_bp_t *bp)
{ … }

/*
 * 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)
{ … }

/*
 * 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)
{ … }


/*
 * 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_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)
{ … }

/*
 * 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)
{ … }

/*
 * kdb_ss
 *
 *	Process the 'ss' (Single Step) command.
 *
 *	ss
 *
 * Parameters:
 *	argc	Argument count
 *	argv	Argument vector
 * Outputs:
 *	None.
 * Returns:
 *	KDB_CMD_SS for success, a kdb error if failure.
 * Locking:
 *	None.
 * Remarks:
 *
 *	Set the arch specific option to trigger a debug trap after the next
 *	instruction.
 */

static int kdb_ss(int argc, const char **argv)
{ … }

static kdbtab_t bptab[] = …;

static kdbtab_t bphcmd = …;

/* Initialize the breakpoint table and register	breakpoint commands. */

void __init kdb_initbptab(void)
{ … }