LXR linux/arch/um/os-Linux/registers.c

   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}
  52