1/*
2 * Copyright (C) 2004 PathScale, Inc
3 * Copyright (C) 2004 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
4 * Licensed under the GPL
5 */
6
7#include <errno.h>
8#include <string.h>
9#include <sys/ptrace.h>
10#include <sysdep/ptrace.h>
11#include <sysdep/ptrace_user.h>
12#include <registers.h>
13
14int save_registers(int pid, struct uml_pt_regs *regs)
15{
16	int err;
17
18	err = ptrace(PTRACE_GETREGS, pid, 0, regs->gp);
19	if (err < 0)
20		return -errno;
21	return 0;
22}
23
24int restore_registers(int pid, struct uml_pt_regs *regs)
25{
26	int err;
27
28	err = ptrace(PTRACE_SETREGS, pid, 0, regs->gp);
29	if (err < 0)
30		return -errno;
31	return 0;
32}
33
34/* This is set once at boot time and not changed thereafter */
35
36static unsigned long exec_regs[MAX_REG_NR];
37static unsigned long exec_fp_regs[FP_SIZE];
38
39int init_registers(int pid)
40{
41	int err;
42
43	err = ptrace(PTRACE_GETREGS, pid, 0, exec_regs);
44	if (err < 0)
45		return -errno;
46
47	arch_init_registers(pid);
48	get_fp_registers(pid, exec_fp_regs);
49	return 0;
50}
51
52void get_safe_registers(unsigned long *regs, unsigned long *fp_regs)
53{
54	memcpy(regs, exec_regs, sizeof(exec_regs));
55
56	if (fp_regs)
57		memcpy(fp_regs, exec_fp_regs, sizeof(exec_fp_regs));
58}
59