tools/memory_watcher/ia32_modrm_map.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 /*
   6  * Table of relevant information about how to decode the ModR/M byte.
   7  * Based on information in the IA 32 Intel Architecture
   8  * Software Developer's Manual Volume 2: Instruction Set Reference.
   9  */
  10
  11 #include "mini_disassembler.h"
  12 #include "mini_disassembler_types.h"
  13
  14 namespace sidestep {
  15
  16 const ModrmEntry MiniDisassembler::s_ia16_modrm_map_[] = {
  17 // mod == 00
  18   /* r/m == 000 */ { false, false, OS_ZERO },
  19   /* r/m == 001 */ { false, false, OS_ZERO },
  20   /* r/m == 010 */ { false, false, OS_ZERO },
  21   /* r/m == 011 */ { false, false, OS_ZERO },
  22   /* r/m == 100 */ { false, false, OS_ZERO },
  23   /* r/m == 101 */ { false, false, OS_ZERO },
  24   /* r/m == 110 */ { true, false, OS_WORD },
  25   /* r/m == 111 */ { false, false, OS_ZERO },
  26 // mod == 01
  27   /* r/m == 000 */ { true, false, OS_BYTE },
  28   /* r/m == 001 */ { true, false, OS_BYTE },
  29   /* r/m == 010 */ { true, false, OS_BYTE },
  30   /* r/m == 011 */ { true, false, OS_BYTE },
  31   /* r/m == 100 */ { true, false, OS_BYTE },
  32   /* r/m == 101 */ { true, false, OS_BYTE },
  33   /* r/m == 110 */ { true, false, OS_BYTE },
  34   /* r/m == 111 */ { true, false, OS_BYTE },
  35 // mod == 10
  36   /* r/m == 000 */ { true, false, OS_WORD },
  37   /* r/m == 001 */ { true, false, OS_WORD },
  38   /* r/m == 010 */ { true, false, OS_WORD },
  39   /* r/m == 011 */ { true, false, OS_WORD },
  40   /* r/m == 100 */ { true, false, OS_WORD },
  41   /* r/m == 101 */ { true, false, OS_WORD },
  42   /* r/m == 110 */ { true, false, OS_WORD },
  43   /* r/m == 111 */ { true, false, OS_WORD },
  44 // mod == 11
  45   /* r/m == 000 */ { false, false, OS_ZERO },
  46   /* r/m == 001 */ { false, false, OS_ZERO },
  47   /* r/m == 010 */ { false, false, OS_ZERO },
  48   /* r/m == 011 */ { false, false, OS_ZERO },
  49   /* r/m == 100 */ { false, false, OS_ZERO },
  50   /* r/m == 101 */ { false, false, OS_ZERO },
  51   /* r/m == 110 */ { false, false, OS_ZERO },
  52   /* r/m == 111 */ { false, false, OS_ZERO }
  53 };
  54
  55 const ModrmEntry MiniDisassembler::s_ia32_modrm_map_[] = {
  56 // mod == 00
  57   /* r/m == 000 */ { false, false, OS_ZERO },
  58   /* r/m == 001 */ { false, false, OS_ZERO },
  59   /* r/m == 010 */ { false, false, OS_ZERO },
  60   /* r/m == 011 */ { false, false, OS_ZERO },
  61   /* r/m == 100 */ { false, true, OS_ZERO },
  62   /* r/m == 101 */ { true, false, OS_DOUBLE_WORD },
  63   /* r/m == 110 */ { false, false, OS_ZERO },
  64   /* r/m == 111 */ { false, false, OS_ZERO },
  65 // mod == 01
  66   /* r/m == 000 */ { true, false, OS_BYTE },
  67   /* r/m == 001 */ { true, false, OS_BYTE },
  68   /* r/m == 010 */ { true, false, OS_BYTE },
  69   /* r/m == 011 */ { true, false, OS_BYTE },
  70   /* r/m == 100 */ { true, true, OS_BYTE },
  71   /* r/m == 101 */ { true, false, OS_BYTE },
  72   /* r/m == 110 */ { true, false, OS_BYTE },
  73   /* r/m == 111 */ { true, false, OS_BYTE },
  74 // mod == 10
  75   /* r/m == 000 */ { true, false, OS_DOUBLE_WORD },
  76   /* r/m == 001 */ { true, false, OS_DOUBLE_WORD },
  77   /* r/m == 010 */ { true, false, OS_DOUBLE_WORD },
  78   /* r/m == 011 */ { true, false, OS_DOUBLE_WORD },
  79   /* r/m == 100 */ { true, true, OS_DOUBLE_WORD },
  80   /* r/m == 101 */ { true, false, OS_DOUBLE_WORD },
  81   /* r/m == 110 */ { true, false, OS_DOUBLE_WORD },
  82   /* r/m == 111 */ { true, false, OS_DOUBLE_WORD },
  83 // mod == 11
  84   /* r/m == 000 */ { false, false, OS_ZERO },
  85   /* r/m == 001 */ { false, false, OS_ZERO },
  86   /* r/m == 010 */ { false, false, OS_ZERO },
  87   /* r/m == 011 */ { false, false, OS_ZERO },
  88   /* r/m == 100 */ { false, false, OS_ZERO },
  89   /* r/m == 101 */ { false, false, OS_ZERO },
  90   /* r/m == 110 */ { false, false, OS_ZERO },
  91   /* r/m == 111 */ { false, false, OS_ZERO },
  92 };
  93
  94 };  // namespace sidestep