tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
12int save_registers(int pid, struct uml_pt_regs *regs)
13{
14 int err;
15
16 err = ptrace(PTRACE_GETREGS, pid, 0, regs->gp);
17 if (err < 0)
18 return -errno;
19 return 0;
20}
21
22int restore_registers(int pid, struct uml_pt_regs *regs)
23{
24 int err;
25
26 err = ptrace(PTRACE_SETREGS, pid, 0, regs->gp);
27 if (err < 0)
28 return -errno;
29 return 0;
30}
31
32/* This is set once at boot time and not changed thereafter */
33
34static unsigned long exec_regs[MAX_REG_NR];
35
36int init_registers(int pid)
37{
38 int err;
39
40 err = ptrace(PTRACE_GETREGS, pid, 0, exec_regs);
41 if (err < 0)
42 return -errno;
43
44 arch_init_registers(pid);
45 return 0;
46}
47
48void get_safe_registers(unsigned long *regs)
49{
50 memcpy(regs, exec_regs, sizeof(exec_regs));
51}