arch/um/os-Linux/registers.c

   1 /*
   2  * Copyright (C) 2004 PathScale, Inc
   3  * Licensed under the GPL
   4  */
   5
   6 #include <errno.h>
   7 #include <string.h>
   8 #include <sys/ptrace.h>
   9 #include "user.h"
  10 #include "sysdep/ptrace.h"
  11
  12 /* This is set once at boot time and not changed thereafter */
  13
  14 static unsigned long exec_regs[MAX_REG_NR];
  15
  16 void init_thread_registers(struct uml_pt_regs *to)
  17 {
  18         memcpy(to->regs, exec_regs, sizeof(to->regs));
  19 }
  20
  21 void save_registers(int pid, struct uml_pt_regs *regs)
  22 {
  23         int err;
  24
  25         err = ptrace(PTRACE_GETREGS, pid, 0, regs->regs);
  26         if(err < 0)
  27                 panic("save_registers - saving registers failed, errno = %d\n",
  28                       errno);
  29 }
  30
  31 void restore_registers(int pid, struct uml_pt_regs *regs)
  32 {
  33         int err;
  34
  35         err = ptrace(PTRACE_SETREGS, pid, 0, regs->regs);
  36         if(err < 0)
  37                 panic("restore_registers - saving registers failed, "
  38                       "errno = %d\n", errno);
  39 }
  40
  41 void init_registers(int pid)
  42 {
  43         int err;
  44
  45         err = ptrace(PTRACE_GETREGS, pid, 0, exec_regs);
  46         if(err)
  47                 panic("check_ptrace : PTRACE_GETREGS failed, errno = %d",
  48                       errno);
  49 }
  50
  51 void get_safe_registers(unsigned long *regs)
  52 {
  53         memcpy(regs, exec_regs, sizeof(exec_regs));
  54 }