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