arch/um/os-Linux/sys-i386/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 "kern_constants.h"
   9 #include "longjmp.h"
  10 #include "user.h"
  11 #include "sysdep/ptrace_user.h"
  12
  13 int save_fp_registers(int pid, unsigned long *fp_regs)
  14 {
  15         if (ptrace(PTRACE_GETFPREGS, pid, 0, fp_regs) < 0)
  16                 return -errno;
  17         return 0;
  18 }
  19
  20 int restore_fp_registers(int pid, unsigned long *fp_regs)
  21 {
  22         if (ptrace(PTRACE_SETFPREGS, pid, 0, fp_regs) < 0)
  23                 return -errno;
  24         return 0;
  25 }
  26
  27 int save_fpx_registers(int pid, unsigned long *fp_regs)
  28 {
  29         if (ptrace(PTRACE_GETFPXREGS, pid, 0, fp_regs) < 0)
  30                 return -errno;
  31         return 0;
  32 }
  33
  34 int restore_fpx_registers(int pid, unsigned long *fp_regs)
  35 {
  36         if (ptrace(PTRACE_SETFPXREGS, pid, 0, fp_regs) < 0)
  37                 return -errno;
  38         return 0;
  39 }
  40
  41 unsigned long get_thread_reg(int reg, jmp_buf *buf)
  42 {
  43         switch (reg) {
  44         case EIP:
  45                 return buf[0]->__eip;
  46         case UESP:
  47                 return buf[0]->__esp;
  48         case EBP:
  49                 return buf[0]->__ebp;
  50         default:
  51                 printk(UM_KERN_ERR "get_thread_regs - unknown register %d\n",
  52                        reg);
  53                 return 0;
  54         }
  55 }
  56
  57 int have_fpx_regs = 1;
  58
  59 int get_fp_registers(int pid, unsigned long *regs)
  60 {
  61         if (have_fpx_regs)
  62                 return save_fpx_registers(pid, regs);
  63         else
  64                 return save_fp_registers(pid, regs);
  65 }
  66
  67 int put_fp_registers(int pid, unsigned long *regs)
  68 {
  69         if (have_fpx_regs)
  70                 return restore_fpx_registers(pid, regs);
  71         else
  72                 return restore_fp_registers(pid, regs);
  73 }
  74
  75 void arch_init_registers(int pid)
  76 {
  77         unsigned long fpx_regs[HOST_XFP_SIZE];
  78         int err;
  79
  80         err = ptrace(PTRACE_GETFPXREGS, pid, 0, fpx_regs);
  81         if (!err)
  82                 return;
  83
  84         if (errno != EIO)
  85                 panic("check_ptrace : PTRACE_GETFPXREGS failed, errno = %d",
  86                       errno);
  87
  88         have_fpx_regs = 0;
  89 }