regs.c revision 5570a7769869a4df25ef85f302f74a7feb6c0cd3 
1#if HAVE_CONFIG_H
2#include "config.h"
3#endif
4
5#include <sys/types.h>
6#include <sys/ptrace.h>
7
8#include <asm/ptrace_offsets.h>
9#include <asm/rse.h>
10
11#include <stddef.h>
12#include "debug.h"
13#include "ltrace.h"
14
15void *
16get_instruction_pointer(struct process * proc) {
17	unsigned long ip = ptrace(PTRACE_PEEKUSER, proc->pid, PT_CR_IIP, 0);
18	unsigned long slot = (ptrace(PTRACE_PEEKUSER, proc->pid, PT_CR_IPSR, 0) >> 41) & 3;
19
20	return (void*)(ip | slot);
21}
22
23void
24set_instruction_pointer(struct process * proc, void * addr) {
25
26	unsigned long newip = (unsigned long)addr;
27	int slot = (int) addr & 0xf;
28	unsigned long psr = ptrace(PTRACE_PEEKUSER, proc->pid, PT_CR_IPSR, 0);
29
30	psr &= ~(3UL << 41);
31	psr |= (unsigned long)(slot & 0x3) << 41;
32
33	newip &= ~0xfUL;
34
35	ptrace(PTRACE_POKEUSER, proc->pid, PT_CR_IIP, (long)newip);
36	ptrace(PTRACE_POKEUSER, proc->pid, PT_CR_IPSR, psr);
37}
38
39void *
40get_stack_pointer(struct process * proc) {
41	return (void *)ptrace(PTRACE_PEEKUSER, proc->pid, PT_R12, 0);
42}
43
44void *
45get_return_addr(struct process * proc, void * stack_pointer) {
46	return (void *)ptrace(PTRACE_PEEKUSER, proc->pid, PT_B0, 0);
47}
48