arch/x86/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 <sys/ptrace.h>
   9 #ifdef __i386__
  10 #include <sys/user.h>
  11 #endif
  12 #include "longjmp.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 #ifdef __i386__
  30 int have_fpx_regs = 1;
  31 int save_fpx_registers(int pid, unsigned long *fp_regs)
  32 {
  33         if (ptrace(PTRACE_GETFPXREGS, pid, 0, fp_regs) < 0)
  34                 return -errno;
  35         return 0;
  36 }
  37
  38 int restore_fpx_registers(int pid, unsigned long *fp_regs)
  39 {
  40         if (ptrace(PTRACE_SETFPXREGS, pid, 0, fp_regs) < 0)
  41                 return -errno;
  42         return 0;
  43 }
  44
  45 int get_fp_registers(int pid, unsigned long *regs)
  46 {
  47         if (have_fpx_regs)
  48                 return save_fpx_registers(pid, regs);
  49         else
  50                 return save_fp_registers(pid, regs);
  51 }
  52
  53 int put_fp_registers(int pid, unsigned long *regs)
  54 {
  55         if (have_fpx_regs)
  56                 return restore_fpx_registers(pid, regs);
  57         else
  58                 return restore_fp_registers(pid, regs);
  59 }
  60
  61 void arch_init_registers(int pid)
  62 {
  63         struct user_fpxregs_struct fpx_regs;
  64         int err;
  65
  66         err = ptrace(PTRACE_GETFPXREGS, pid, 0, &fpx_regs);
  67         if (!err)
  68                 return;
  69
  70         if (errno != EIO)
  71                 panic("check_ptrace : PTRACE_GETFPXREGS failed, errno = %d",
  72                       errno);
  73
  74         have_fpx_regs = 0;
  75 }
  76 #else
  77
  78 int get_fp_registers(int pid, unsigned long *regs)
  79 {
  80         return save_fp_registers(pid, regs);
  81 }
  82
  83 int put_fp_registers(int pid, unsigned long *regs)
  84 {
  85         return restore_fp_registers(pid, regs);
  86 }
  87
  88 #endif
  89
  90 unsigned long get_thread_reg(int reg, jmp_buf *buf)
  91 {
  92         switch (reg) {
  93 #ifdef __i386__
  94         case HOST_IP:
  95                 return buf[0]->__eip;
  96         case HOST_SP:
  97                 return buf[0]->__esp;
  98         case HOST_BP:
  99                 return buf[0]->__ebp;
 100 #else
 101         case HOST_IP:
 102                 return buf[0]->__rip;
 103         case HOST_SP:
 104                 return buf[0]->__rsp;
 105         case HOST_BP:
 106                 return buf[0]->__rbp;
 107 #endif
 108         default:
 109                 printk(UM_KERN_ERR "get_thread_regs - unknown register %d\n",
 110                        reg);
 111                 return 0;
 112         }
 113 }