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 #include "user.h"
  12
  13 /* This is set once at boot time and not changed thereafter */
  14
  15 static unsigned long exec_regs[MAX_REG_NR];
  16
  17 void init_thread_registers(struct uml_pt_regs *to)
  18 {
  19         memcpy(to->gp, exec_regs, sizeof(to->gp));
  20 }
  21
  22 void 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
  32 void 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
  42 void 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
  54 void get_safe_registers(unsigned long *regs)
  55 {
  56         memcpy(regs, exec_regs, sizeof(exec_regs));
  57 }