135 lines
3.9 KiB
C
135 lines
3.9 KiB
C
/*
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* This file is part of ltrace.
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* Copyright (C) 2011 Petr Machata, Red Hat Inc.
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* Copyright (C) 2006 Ian Wienand
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* Copyright (C) 2002,2008,2009 Juan Cespedes
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*/
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#include "config.h"
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#include <sys/ptrace.h>
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#include <errno.h>
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#include <string.h>
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#include <stdio.h>
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#include "common.h"
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#include "backend.h"
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#include "sysdep.h"
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#include "breakpoint.h"
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#include "proc.h"
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#include "library.h"
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#ifdef ARCH_HAVE_ENABLE_BREAKPOINT
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extern void arch_enable_breakpoint(pid_t, struct breakpoint *);
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#else /* ARCH_HAVE_ENABLE_BREAKPOINT */
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void
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arch_enable_breakpoint(pid_t pid, struct breakpoint *sbp)
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{
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static unsigned char break_insn[] = BREAKPOINT_VALUE;
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unsigned int i, j;
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debug(DEBUG_PROCESS,
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"arch_enable_breakpoint: pid=%d, addr=%p, symbol=%s",
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pid, sbp->addr, breakpoint_name(sbp));
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for (i = 0; i < 1 + ((BREAKPOINT_LENGTH - 1) / sizeof(long)); i++) {
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long a = ptrace(PTRACE_PEEKTEXT, pid,
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sbp->addr + i * sizeof(long), 0);
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if (a == -1 && errno) {
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fprintf(stderr, "enable_breakpoint"
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" pid=%d, addr=%p, symbol=%s: %s\n",
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pid, sbp->addr, breakpoint_name(sbp),
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strerror(errno));
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return;
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}
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for (j = 0;
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j < sizeof(long)
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&& i * sizeof(long) + j < BREAKPOINT_LENGTH; j++) {
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unsigned char *bytes = (unsigned char *)&a;
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sbp->orig_value[i * sizeof(long) + j] = bytes[j];
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bytes[j] = break_insn[i * sizeof(long) + j];
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}
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a = ptrace(PTRACE_POKETEXT, pid,
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sbp->addr + i * sizeof(long), a);
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if (a == -1) {
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fprintf(stderr, "enable_breakpoint"
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" pid=%d, addr=%p, symbol=%s: %s\n",
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pid, sbp->addr, breakpoint_name(sbp),
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strerror(errno));
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return;
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}
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}
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}
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#endif /* ARCH_HAVE_ENABLE_BREAKPOINT */
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void
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enable_breakpoint(struct process *proc, struct breakpoint *sbp)
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{
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debug(DEBUG_PROCESS, "enable_breakpoint: pid=%d, addr=%p, symbol=%s",
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proc->pid, sbp->addr, breakpoint_name(sbp));
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arch_enable_breakpoint(proc->pid, sbp);
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}
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#ifdef ARCH_HAVE_DISABLE_BREAKPOINT
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extern void arch_disable_breakpoint(pid_t, const struct breakpoint *sbp);
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#else /* ARCH_HAVE_DISABLE_BREAKPOINT */
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void
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arch_disable_breakpoint(pid_t pid, const struct breakpoint *sbp)
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{
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unsigned int i, j;
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debug(DEBUG_PROCESS,
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"arch_disable_breakpoint: pid=%d, addr=%p, symbol=%s",
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pid, sbp->addr, breakpoint_name(sbp));
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for (i = 0; i < 1 + ((BREAKPOINT_LENGTH - 1) / sizeof(long)); i++) {
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long a = ptrace(PTRACE_PEEKTEXT, pid,
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sbp->addr + i * sizeof(long), 0);
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if (a == -1 && errno) {
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fprintf(stderr,
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"disable_breakpoint pid=%d, addr=%p: %s\n",
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pid, sbp->addr, strerror(errno));
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return;
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}
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for (j = 0;
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j < sizeof(long)
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&& i * sizeof(long) + j < BREAKPOINT_LENGTH; j++) {
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unsigned char *bytes = (unsigned char *)&a;
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bytes[j] = sbp->orig_value[i * sizeof(long) + j];
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}
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a = ptrace(PTRACE_POKETEXT, pid,
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sbp->addr + i * sizeof(long), a);
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if (a == -1 && errno) {
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fprintf(stderr,
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"disable_breakpoint pid=%d, addr=%p: %s\n",
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pid, sbp->addr, strerror(errno));
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return;
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}
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}
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}
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#endif /* ARCH_HAVE_DISABLE_BREAKPOINT */
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void
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disable_breakpoint(struct process *proc, struct breakpoint *sbp)
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{
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debug(DEBUG_PROCESS, "disable_breakpoint: pid=%d, addr=%p, symbol=%s",
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proc->pid, sbp->addr, breakpoint_name(sbp));
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arch_disable_breakpoint(proc->pid, sbp);
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}
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