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 <stdlib.h>
   9 #include <sys/ptrace.h>
  10 #ifdef __i386__
  11 #include <sys/user.h>
  12 #endif
  13 #include <longjmp.h>
  14 #include <sysdep/ptrace_user.h>
  15 #include <sys/uio.h>
  16 #include <asm/sigcontext.h>
  17 #include <linux/elf.h>
  18
  19 int have_xstate_support;
  20
  21 int save_i387_registers(int pid, unsigned long *fp_regs)
  22 {
  23         if (ptrace(PTRACE_GETFPREGS, pid, 0, fp_regs) < 0)
  24                 return -errno;
  25         return 0;
  26 }
  27
  28 int save_fp_registers(int pid, unsigned long *fp_regs)
  29 {
  30 #ifdef PTRACE_GETREGSET
  31         struct iovec iov;
  32
  33         if (have_xstate_support) {
  34                 iov.iov_base = fp_regs;
  35                 iov.iov_len = FP_SIZE * sizeof(unsigned long);
  36                 if (ptrace(PTRACE_GETREGSET, pid, NT_X86_XSTATE, &iov) < 0)
  37                         return -errno;
  38                 return 0;
  39         } else
  40 #endif
  41                 return save_i387_registers(pid, fp_regs);
  42 }
  43
  44 int restore_i387_registers(int pid, unsigned long *fp_regs)
  45 {
  46         if (ptrace(PTRACE_SETFPREGS, pid, 0, fp_regs) < 0)
  47                 return -errno;
  48         return 0;
  49 }
  50
  51 int restore_fp_registers(int pid, unsigned long *fp_regs)
  52 {
  53 #ifdef PTRACE_SETREGSET
  54         struct iovec iov;
  55         if (have_xstate_support) {
  56                 iov.iov_base = fp_regs;
  57                 iov.iov_len = FP_SIZE * sizeof(unsigned long);
  58                 if (ptrace(PTRACE_SETREGSET, pid, NT_X86_XSTATE, &iov) < 0)
  59                         return -errno;
  60                 return 0;
  61         } else
  62 #endif
  63                 return restore_i387_registers(pid, fp_regs);
  64 }
  65
  66 #ifdef __i386__
  67 int have_fpx_regs = 1;
  68 int save_fpx_registers(int pid, unsigned long *fp_regs)
  69 {
  70         if (ptrace(PTRACE_GETFPXREGS, pid, 0, fp_regs) < 0)
  71                 return -errno;
  72         return 0;
  73 }
  74
  75 int restore_fpx_registers(int pid, unsigned long *fp_regs)
  76 {
  77         if (ptrace(PTRACE_SETFPXREGS, pid, 0, fp_regs) < 0)
  78                 return -errno;
  79         return 0;
  80 }
  81
  82 int get_fp_registers(int pid, unsigned long *regs)
  83 {
  84         if (have_fpx_regs)
  85                 return save_fpx_registers(pid, regs);
  86         else
  87                 return save_fp_registers(pid, regs);
  88 }
  89
  90 int put_fp_registers(int pid, unsigned long *regs)
  91 {
  92         if (have_fpx_regs)
  93                 return restore_fpx_registers(pid, regs);
  94         else
  95                 return restore_fp_registers(pid, regs);
  96 }
  97
  98 void arch_init_registers(int pid)
  99 {
 100         struct user_fpxregs_struct fpx_regs;
 101         int err;
 102
 103         err = ptrace(PTRACE_GETFPXREGS, pid, 0, &fpx_regs);
 104         if (!err)
 105                 return;
 106
 107         if (errno != EIO)
 108                 panic("check_ptrace : PTRACE_GETFPXREGS failed, errno = %d",
 109                       errno);
 110
 111         have_fpx_regs = 0;
 112 }
 113 #else
 114
 115 int get_fp_registers(int pid, unsigned long *regs)
 116 {
 117         return save_fp_registers(pid, regs);
 118 }
 119
 120 int put_fp_registers(int pid, unsigned long *regs)
 121 {
 122         return restore_fp_registers(pid, regs);
 123 }
 124
 125 void arch_init_registers(int pid)
 126 {
 127 #ifdef PTRACE_GETREGSET
 128         void * fp_regs;
 129         struct iovec iov;
 130
 131         fp_regs = malloc(FP_SIZE * sizeof(unsigned long));
 132         if(fp_regs == NULL)
 133                 return;
 134
 135         iov.iov_base = fp_regs;
 136         iov.iov_len = FP_SIZE * sizeof(unsigned long);
 137         if (ptrace(PTRACE_GETREGSET, pid, NT_X86_XSTATE, &iov) == 0)
 138                 have_xstate_support = 1;
 139
 140         free(fp_regs);
 141 #endif
 142 }
 143 #endif
 144
 145 unsigned long get_thread_reg(int reg, jmp_buf *buf)
 146 {
 147         switch (reg) {
 148 #ifdef __i386__
 149         case HOST_IP:
 150                 return buf[0]->__eip;
 151         case HOST_SP:
 152                 return buf[0]->__esp;
 153         case HOST_BP:
 154                 return buf[0]->__ebp;
 155 #else
 156         case HOST_IP:
 157                 return buf[0]->__rip;
 158         case HOST_SP:
 159                 return buf[0]->__rsp;
 160         case HOST_BP:
 161                 return buf[0]->__rbp;
 162 #endif
 163         default:
 164                 printk(UM_KERN_ERR "get_thread_regs - unknown register %d\n",
 165                        reg);
 166                 return 0;
 167         }
 168 }