regs.c revision f04d032e298c410e45553223a979c1f26f280259 
1#include "config.h"
2
3#include <sys/types.h>
4#include <sys/ptrace.h>
5#include <asm/ptrace.h>
6#include <errno.h>
7#include <error.h>
8
9#include "proc.h"
10#include "common.h"
11
12#if (!defined(PTRACE_PEEKUSER) && defined(PTRACE_PEEKUSR))
13# define PTRACE_PEEKUSER PTRACE_PEEKUSR
14#endif
15
16#if (!defined(PTRACE_POKEUSER) && defined(PTRACE_POKEUSR))
17# define PTRACE_POKEUSER PTRACE_POKEUSR
18#endif
19
20void *
21get_instruction_pointer(Process *proc) {
22	return (void *)ptrace(PTRACE_PEEKUSER, proc->pid, sizeof(long)*PT_NIP, 0);
23}
24
25void
26set_instruction_pointer(Process *proc, void *addr)
27{
28	if (ptrace(PTRACE_POKEUSER, proc->pid, sizeof(long)*PT_NIP, addr) != 0)
29		error(0, errno, "set_instruction_pointer");
30}
31
32void *
33get_stack_pointer(Process *proc) {
34	return (void *)ptrace(PTRACE_PEEKUSER, proc->pid, sizeof(long)*PT_R1, 0);
35}
36
37void *
38get_return_addr(Process *proc, void *stack_pointer) {
39	return (void *)ptrace(PTRACE_PEEKUSER, proc->pid, sizeof(long)*PT_LNK, 0);
40}
41
42void
43set_return_addr(Process *proc, void *addr) {
44	ptrace(PTRACE_POKEUSER, proc->pid, sizeof(long)*PT_LNK, addr);
45}
46
47/* Grab the value of CTR registers.  */
48void *
49get_count_register (Process *proc) {
50	return (void *) ptrace (PTRACE_PEEKUSER, proc->pid,
51				sizeof (long) * PT_CTR, 0);
52}
53