tools/memory_watcher/ia32_modrm_map.cc

   1 /* Copyright (c) 2007, Google Inc.
   2  * All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions are
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   9  * notice, this list of conditions and the following disclaimer.
  10  *     * Redistributions in binary form must reproduce the above
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  12  * in the documentation and/or other materials provided with the
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  15  * contributors may be used to endorse or promote products derived from
  16  * this software without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  29  *
  30  * ---
  31  *
  32  * Table of relevant information about how to decode the ModR/M byte.
  33  * Based on information in the IA 32 Intel Architecture
  34  * Software Developer's Manual Volume 2: Instruction Set Reference.
  35  */
  36
  37 #include "mini_disassembler.h"
  38 #include "mini_disassembler_types.h"
  39
  40 namespace sidestep {
  41
  42 const ModrmEntry MiniDisassembler::s_ia16_modrm_map_[] = {
  43 // mod == 00
  44   /* r/m == 000 */ { false, false, OS_ZERO },
  45   /* r/m == 001 */ { false, false, OS_ZERO },
  46   /* r/m == 010 */ { false, false, OS_ZERO },
  47   /* r/m == 011 */ { false, false, OS_ZERO },
  48   /* r/m == 100 */ { false, false, OS_ZERO },
  49   /* r/m == 101 */ { false, false, OS_ZERO },
  50   /* r/m == 110 */ { true, false, OS_WORD },
  51   /* r/m == 111 */ { false, false, OS_ZERO },
  52 // mod == 01
  53   /* r/m == 000 */ { true, false, OS_BYTE },
  54   /* r/m == 001 */ { true, false, OS_BYTE },
  55   /* r/m == 010 */ { true, false, OS_BYTE },
  56   /* r/m == 011 */ { true, false, OS_BYTE },
  57   /* r/m == 100 */ { true, false, OS_BYTE },
  58   /* r/m == 101 */ { true, false, OS_BYTE },
  59   /* r/m == 110 */ { true, false, OS_BYTE },
  60   /* r/m == 111 */ { true, false, OS_BYTE },
  61 // mod == 10
  62   /* r/m == 000 */ { true, false, OS_WORD },
  63   /* r/m == 001 */ { true, false, OS_WORD },
  64   /* r/m == 010 */ { true, false, OS_WORD },
  65   /* r/m == 011 */ { true, false, OS_WORD },
  66   /* r/m == 100 */ { true, false, OS_WORD },
  67   /* r/m == 101 */ { true, false, OS_WORD },
  68   /* r/m == 110 */ { true, false, OS_WORD },
  69   /* r/m == 111 */ { true, false, OS_WORD },
  70 // mod == 11
  71   /* r/m == 000 */ { false, false, OS_ZERO },
  72   /* r/m == 001 */ { false, false, OS_ZERO },
  73   /* r/m == 010 */ { false, false, OS_ZERO },
  74   /* r/m == 011 */ { false, false, OS_ZERO },
  75   /* r/m == 100 */ { false, false, OS_ZERO },
  76   /* r/m == 101 */ { false, false, OS_ZERO },
  77   /* r/m == 110 */ { false, false, OS_ZERO },
  78   /* r/m == 111 */ { false, false, OS_ZERO }
  79 };
  80
  81 const ModrmEntry MiniDisassembler::s_ia32_modrm_map_[] = {
  82 // mod == 00
  83   /* r/m == 000 */ { false, false, OS_ZERO },
  84   /* r/m == 001 */ { false, false, OS_ZERO },
  85   /* r/m == 010 */ { false, false, OS_ZERO },
  86   /* r/m == 011 */ { false, false, OS_ZERO },
  87   /* r/m == 100 */ { false, true, OS_ZERO },
  88   /* r/m == 101 */ { true, false, OS_DOUBLE_WORD },
  89   /* r/m == 110 */ { false, false, OS_ZERO },
  90   /* r/m == 111 */ { false, false, OS_ZERO },
  91 // mod == 01
  92   /* r/m == 000 */ { true, false, OS_BYTE },
  93   /* r/m == 001 */ { true, false, OS_BYTE },
  94   /* r/m == 010 */ { true, false, OS_BYTE },
  95   /* r/m == 011 */ { true, false, OS_BYTE },
  96   /* r/m == 100 */ { true, true, OS_BYTE },
  97   /* r/m == 101 */ { true, false, OS_BYTE },
  98   /* r/m == 110 */ { true, false, OS_BYTE },
  99   /* r/m == 111 */ { true, false, OS_BYTE },
 100 // mod == 10
 101   /* r/m == 000 */ { true, false, OS_DOUBLE_WORD },
 102   /* r/m == 001 */ { true, false, OS_DOUBLE_WORD },
 103   /* r/m == 010 */ { true, false, OS_DOUBLE_WORD },
 104   /* r/m == 011 */ { true, false, OS_DOUBLE_WORD },
 105   /* r/m == 100 */ { true, true, OS_DOUBLE_WORD },
 106   /* r/m == 101 */ { true, false, OS_DOUBLE_WORD },
 107   /* r/m == 110 */ { true, false, OS_DOUBLE_WORD },
 108   /* r/m == 111 */ { true, false, OS_DOUBLE_WORD },
 109 // mod == 11
 110   /* r/m == 000 */ { false, false, OS_ZERO },
 111   /* r/m == 001 */ { false, false, OS_ZERO },
 112   /* r/m == 010 */ { false, false, OS_ZERO },
 113   /* r/m == 011 */ { false, false, OS_ZERO },
 114   /* r/m == 100 */ { false, false, OS_ZERO },
 115   /* r/m == 101 */ { false, false, OS_ZERO },
 116   /* r/m == 110 */ { false, false, OS_ZERO },
 117   /* r/m == 111 */ { false, false, OS_ZERO },
 118 };
 119
 120 };  // namespace sidestep