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 <sys/ptrace.h>
   9 #include <sys/user.h>
  10 #include "kern_constants.h"
  11 #include "longjmp.h"
  12 #include "user.h"
  13 #include "sysdep/ptrace_user.h"
  14
  15 int save_fp_registers(int pid, unsigned long *fp_regs)
  16 {
  17         if (ptrace(PTRACE_GETFPREGS, pid, 0, fp_regs) < 0)
  18                 return -errno;
  19         return 0;
  20 }
  21
  22 int restore_fp_registers(int pid, unsigned long *fp_regs)
  23 {
  24         if (ptrace(PTRACE_SETFPREGS, pid, 0, fp_regs) < 0)
  25                 return -errno;
  26         return 0;
  27 }
  28
  29 int save_fpx_registers(int pid, unsigned long *fp_regs)
  30 {
  31         if (ptrace(PTRACE_GETFPXREGS, pid, 0, fp_regs) < 0)
  32                 return -errno;
  33         return 0;
  34 }
  35
  36 int restore_fpx_registers(int pid, unsigned long *fp_regs)
  37 {
  38         if (ptrace(PTRACE_SETFPXREGS, pid, 0, fp_regs) < 0)
  39                 return -errno;
  40         return 0;
  41 }
  42
  43 unsigned long get_thread_reg(int reg, jmp_buf *buf)
  44 {
  45         switch (reg) {
  46         case EIP:
  47                 return buf[0]->__eip;
  48         case UESP:
  49                 return buf[0]->__esp;
  50         case EBP:
  51                 return buf[0]->__ebp;
  52         default:
  53                 printk(UM_KERN_ERR "get_thread_regs - unknown register %d\n",
  54                        reg);
  55                 return 0;
  56         }
  57 }
  58
  59 int have_fpx_regs = 1;
  60
  61 int get_fp_registers(int pid, unsigned long *regs)
  62 {
  63         if (have_fpx_regs)
  64                 return save_fpx_registers(pid, regs);
  65         else
  66                 return save_fp_registers(pid, regs);
  67 }
  68
  69 int put_fp_registers(int pid, unsigned long *regs)
  70 {
  71         if (have_fpx_regs)
  72                 return restore_fpx_registers(pid, regs);
  73         else
  74                 return restore_fp_registers(pid, regs);
  75 }
  76
  77 void arch_init_registers(int pid)
  78 {
  79         struct user_fpxregs_struct fpx_regs;
  80         int err;
  81
  82         err = ptrace(PTRACE_GETFPXREGS, pid, 0, &fpx_regs);
  83         if (!err)
  84                 return;
  85
  86         if (errno != EIO)
  87                 panic("check_ptrace : PTRACE_GETFPXREGS failed, errno = %d",
  88                       errno);
  89
  90         have_fpx_regs = 0;
  91 }