service_runtime/linux/sel_segments.c

   1 /*
   2  * Copyright 2008, Google Inc.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions are
   7  * met:
   8  *
   9  *     * Redistributions of source code must retain the above copyright
  10  * notice, this list of conditions and the following disclaimer.
  11  *     * Redistributions in binary form must reproduce the above
  12  * copyright notice, this list of conditions and the following disclaimer
  13  * in the documentation and/or other materials provided with the
  14  * distribution.
  15  *     * Neither the name of Google Inc. nor the names of its
  16  * contributors may be used to endorse or promote products derived from
  17  * this software without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  20  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  21  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  22  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  23  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  24  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  25  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  26  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  27  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  28  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  29  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 /*
  33  * NaCl Runtime.
  34  */
  35
  36 #include <stdint.h>
  37
  38 #include "native_client/service_runtime/sel_rt.h"
  39
  40 uint16_t NaClGetCs(void)
  41 {
  42   uint16_t seg1;
  43
  44   asm("mov %%cs, %0;" : "=r" (seg1) : );
  45   return seg1;
  46 }
  47
  48 /* there is no SetCS -- this is done via far jumps/calls */
  49
  50 uint16_t NaClGetDs(void)
  51 {
  52   uint16_t seg1;
  53
  54   asm("mov %%ds, %0" : "=r" (seg1) : );
  55   return seg1;
  56 }
  57
  58 void    NaClSetDs(uint16_t   seg1)
  59 {
  60   asm("movw %0, %%ds;" : : "r" (seg1));
  61 }
  62
  63 uint16_t NaClGetEs(void)
  64 {
  65   uint16_t seg1;
  66
  67   asm("mov %%es, %0" : "=r" (seg1) : );
  68   return seg1;
  69 }
  70
  71 void    NaClSetEs(uint16_t   seg1)
  72 {
  73
  74   asm("movw %0, %%es;" : : "r" (seg1));
  75 }
  76
  77 uint16_t NaClGetFs(void)
  78 {
  79   uint16_t seg1;
  80
  81   asm("mov %%fs, %0" : "=r" (seg1) : );
  82   return seg1;
  83 }
  84
  85 void    NaClSetFs(uint16_t seg1)
  86 {
  87   asm("movw %0, %%fs;" : : "r" (seg1));
  88 }
  89
  90 uint16_t NaClGetGs(void)
  91 {
  92   uint16_t seg1;
  93
  94   asm("mov %%gs, %0" : "=r" (seg1) : );
  95   return seg1;
  96 }
  97
  98 void    NaClSetGs(uint16_t seg1)
  99 {
 100   asm("movw %0, %%gs;" : : "r" (seg1));
 101 }
 102
 103 uint16_t NaClGetSs(void)
 104 {
 105   uint16_t seg1;
 106
 107   asm("mov %%ss, %0" : "=r" (seg1) : );
 108   return seg1;
 109 }
 110
 111 uint32_t NaClGetEsp(void)
 112 {
 113   uint32_t esp;
 114
 115   asm("movl %%esp, %0" : "=r" (esp) : );
 116   return esp;
 117 }
 118
 119 uint32_t NaClGetEbx(void)
 120 {
 121   uint32_t  ebx;
 122
 123   asm("movl %%ebx, %0" : "=r" (ebx) : );
 124   return ebx;
 125 }