| /* |
| * 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(struct 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(struct 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); |
| } |