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#include "user.h"
12
13/* This is set once at boot time and not changed thereafter */
14
15static unsigned long exec_regs[MAX_REG_NR];
16
17void init_thread_registers(struct uml_pt_regs *to)
18{
19 memcpy(to->gp, exec_regs, sizeof(to->gp));
20}
21
22void save_registers(int pid, struct uml_pt_regs *regs)
23{
24 int err;
25
26 err = ptrace(PTRACE_GETREGS, pid, 0, regs->gp);
27 if (err < 0)
28 panic("save_registers - saving registers failed, errno = %d\n",
29 errno);
30}
31
32void restore_registers(int pid, struct uml_pt_regs *regs)
33{
34 int err;
35
36 err = ptrace(PTRACE_SETREGS, pid, 0, regs->gp);
37 if (err < 0)
38 panic("restore_registers - saving registers failed, "
39 "errno = %d\n", errno);
40}
41
42void init_registers(int pid)
43{
44 int err;
45
46 err = ptrace(PTRACE_GETREGS, pid, 0, exec_regs);
47 if (err)
48 panic("check_ptrace : PTRACE_GETREGS failed, errno = %d",
49 errno);
50
51 arch_init_registers(pid);
52}
53
54void get_safe_registers(unsigned long *regs)
55{
56 memcpy(regs, exec_regs, sizeof(exec_regs));
57}