diff options
Diffstat (limited to 'sysdeps/linux-gnu/arm/breakpoint.c')
| -rw-r--r-- | sysdeps/linux-gnu/arm/breakpoint.c | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/sysdeps/linux-gnu/arm/breakpoint.c b/sysdeps/linux-gnu/arm/breakpoint.c new file mode 100644 index 0000000..2130dcb --- /dev/null +++ b/sysdeps/linux-gnu/arm/breakpoint.c @@ -0,0 +1,77 @@ +/* + * This file is part of ltrace. + * + * Copyright (C) 2007 by Instituto Nokia de Tecnologia (INdT) + * + * Author: Anderson Lizardo <anderson.lizardo@indt.org.br> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * version 2 as published by the Free Software Foundation. + * + * 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 + * + * Modified from sysdeps/linux-gnu/breakpoint.c and added ARM Thumb support. + */ + +#include <sys/ptrace.h> +#include "config.h" +#include "arch.h" +#include "options.h" +#include "output.h" +#include "debug.h" + +void arch_enable_breakpoint(pid_t pid, struct breakpoint *sbp) +{ + unsigned int i, j; + const unsigned char break_insn[] = BREAKPOINT_VALUE; + const unsigned char thumb_break_insn[] = THUMB_BREAKPOINT_VALUE; + + debug(1, "arch_enable_breakpoint(%d,%p)", pid, sbp->addr); + + for (i = 0; i < 1 + ((BREAKPOINT_LENGTH - 1) / sizeof(long)); i++) { + long a = ptrace(PTRACE_PEEKTEXT, pid, sbp->addr + i * sizeof(long), 0); + unsigned char *bytes = (unsigned char *)&a; + + debug(2, "current = 0x%lx, orig_value = 0x%lx, thumb_mode = %d", a, *(long *)&sbp->orig_value, sbp->thumb_mode); + for (j = 0; j < sizeof(long) && i * sizeof(long) + j < BREAKPOINT_LENGTH; j++) { + + sbp->orig_value[i * sizeof(long) + j] = bytes[j]; + if (!sbp->thumb_mode) { + bytes[j] = break_insn[i * sizeof(long) + j]; + } + else if (j < THUMB_BREAKPOINT_LENGTH) { + bytes[j] = thumb_break_insn[i * sizeof(long) + j]; + } + } + ptrace(PTRACE_POKETEXT, pid, sbp->addr + i * sizeof(long), a); + } +} + +void arch_disable_breakpoint(pid_t pid, const struct breakpoint *sbp) +{ + unsigned int i, j; + const unsigned char break_insn[] = BREAKPOINT_VALUE; + const unsigned char thumb_break_insn[] = THUMB_BREAKPOINT_VALUE; + + debug(1, "arch_disable_breakpoint(%d,%p)", pid, sbp->addr); + + for (i = 0; i < 1 + ((BREAKPOINT_LENGTH - 1) / sizeof(long)); i++) { + long a = ptrace(PTRACE_PEEKTEXT, pid, sbp->addr + i * sizeof(long), 0); + unsigned char *bytes = (unsigned char *)&a; + + debug(2, "current = 0x%lx, orig_value = 0x%lx, thumb_mode = %d", a, *(long *)&sbp->orig_value, sbp->thumb_mode); + for (j = 0; j < sizeof(long) && i * sizeof(long) + j < BREAKPOINT_LENGTH; j++) { + bytes[j] = sbp->orig_value[i * sizeof(long) + j]; + } + ptrace(PTRACE_POKETEXT, pid, sbp->addr + i * sizeof(long), a); + } +} |