regs.c revision 44ae188c8dcd2727e383dcac0d46c3f784d0da5f 
1/*
2 * This file is part of ltrace.
3 * Copyright (C) 2013 Petr Machata, Red Hat Inc.
4 * Copyright (C) 2004,2008,2009 Juan Cespedes
5 * Copyright (C) 2006 Ian Wienand
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License as
9 * published by the Free Software Foundation; either version 2 of the
10 * License, or (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15 * General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20 * 02110-1301 USA
21 */
22
23#include "config.h"
24
25#include <sys/types.h>
26#include "ptrace.h"
27#include "proc.h"
28#include "common.h"
29
30void *
31get_instruction_pointer(struct process *proc)
32{
33	proc_archdep *a = (proc_archdep *) (proc->arch_ptr);
34	if (a->valid)
35		return (void *)a->regs.pc;
36	return (void *)-1;
37}
38
39void
40set_instruction_pointer(struct process *proc, void *addr)
41{
42	proc_archdep *a = (proc_archdep *) (proc->arch_ptr);
43	if (a->valid)
44		a->regs.pc = (long)addr;
45}
46
47void *
48get_stack_pointer(struct process *proc)
49{
50	proc_archdep *a = (proc_archdep *) (proc->arch_ptr);
51	if (a->valid)
52		return (void *)a->regs.u_regs[UREG_I5];
53	return (void *)-1;
54}
55
56void *
57get_return_addr(struct process *proc, void *stack_pointer)
58{
59	proc_archdep *a = (proc_archdep *) (proc->arch_ptr);
60	unsigned int t;
61	if (!a->valid)
62		return (void *)-1;
63	/* Work around structure returns */
64	t = ptrace(PTRACE_PEEKTEXT, proc->pid, a->regs.u_regs[UREG_I6] + 8, 0);
65	if (t < 0x400000)
66		return (void *)a->regs.u_regs[UREG_I6] + 12;
67	return (void *)a->regs.u_regs[UREG_I6] + 8;
68}
69