1 /*
2 * This file is part of ltrace.
3 * Copyright (C) 2013 Petr Machata, Red Hat Inc.
4 * Copyright (C) 1998,2002,2004,2008,2009 Juan Cespedes
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License as
8 * published by the Free Software Foundation; either version 2 of the
9 * License, or (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
19 * 02110-1301 USA
20 */
21
22 #include "config.h"
23
24 #include <sys/types.h>
25 #include <sys/ptrace.h>
26 #include <asm/ptrace.h>
27
28 #include "proc.h"
29 #include "common.h"
30
31 #if (!defined(PTRACE_PEEKUSER) && defined(PTRACE_PEEKUSR))
32 # define PTRACE_PEEKUSER PTRACE_PEEKUSR
33 #endif
34
35 #if (!defined(PTRACE_POKEUSER) && defined(PTRACE_POKEUSR))
36 # define PTRACE_POKEUSER PTRACE_POKEUSR
37 #endif
38
39 void *
get_instruction_pointer(struct process * proc)40 get_instruction_pointer(struct process *proc)
41 {
42 return (void *)ptrace(PTRACE_PEEKUSER, proc->pid, 4 * PT_PC, 0);
43 }
44
45 void
set_instruction_pointer(struct process * proc,void * addr)46 set_instruction_pointer(struct process *proc, void *addr)
47 {
48 ptrace(PTRACE_POKEUSER, proc->pid, 4 * PT_PC, addr);
49 }
50
51 void *
get_stack_pointer(struct process * proc)52 get_stack_pointer(struct process *proc)
53 {
54 return (void *)ptrace(PTRACE_PEEKUSER, proc->pid, 4 * PT_USP, 0);
55 }
56
57 void *
get_return_addr(struct process * proc,void * stack_pointer)58 get_return_addr(struct process *proc, void *stack_pointer)
59 {
60 return (void *)ptrace(PTRACE_PEEKTEXT, proc->pid, stack_pointer, 0);
61 }
62