LXR linux/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
  15int 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
  22int 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__
  30int have_fpx_regs = 1;
  31int 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
  38int 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
  45int 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
  53int 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
  61void 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
  78int get_fp_registers(int pid, unsigned long *regs)
  79{
  80        return save_fp_registers(pid, regs);
  81}
  82
  83int put_fp_registers(int pid, unsigned long *regs)
  84{
  85        return restore_fp_registers(pid, regs);
  86}
  87
  88#endif
  89
  90unsigned 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}
 114