The Tor Browser: security/sandbox/win/src/sidestep/ia32_modrm

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

     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.

     5 // Table of relevant information about how to decode the ModR/M byte.

     6 // Based on information in the IA-32 Intel Architecture

     7 // Software Developer's Manual Volume 2: Instruction Set Reference.

     9 #include "sandbox/win/src/sidestep/mini_disassembler.h"

    10 #include "sandbox/win/src/sidestep/mini_disassembler_types.h"

    12 namespace sidestep {

    14 const ModrmEntry MiniDisassembler::s_ia16_modrm_map_[] = {

    15 // mod == 00

    16   /* r/m == 000 */ { false, false, OS_ZERO },

    17   /* r/m == 001 */ { false, false, OS_ZERO },

    18   /* r/m == 010 */ { false, false, OS_ZERO },

    19   /* r/m == 011 */ { false, false, OS_ZERO },

    20   /* r/m == 100 */ { false, false, OS_ZERO },

    21   /* r/m == 101 */ { false, false, OS_ZERO },

    22   /* r/m == 110 */ { true, false, OS_WORD },

    23   /* r/m == 111 */ { false, false, OS_ZERO },

    24 // mod == 01

    25   /* r/m == 000 */ { true, false, OS_BYTE },

    26   /* r/m == 001 */ { true, false, OS_BYTE },

    27   /* r/m == 010 */ { true, false, OS_BYTE },

    28   /* r/m == 011 */ { true, false, OS_BYTE },

    29   /* r/m == 100 */ { true, false, OS_BYTE },

    30   /* r/m == 101 */ { true, false, OS_BYTE },

    31   /* r/m == 110 */ { true, false, OS_BYTE },

    32   /* r/m == 111 */ { true, false, OS_BYTE },

    33 // mod == 10

    34   /* r/m == 000 */ { true, false, OS_WORD },

    35   /* r/m == 001 */ { true, false, OS_WORD },

    36   /* r/m == 010 */ { true, false, OS_WORD },

    37   /* r/m == 011 */ { true, false, OS_WORD },

    38   /* r/m == 100 */ { true, false, OS_WORD },

    39   /* r/m == 101 */ { true, false, OS_WORD },

    40   /* r/m == 110 */ { true, false, OS_WORD },

    41   /* r/m == 111 */ { true, false, OS_WORD },

    42 // mod == 11

    43   /* r/m == 000 */ { false, false, OS_ZERO },

    44   /* r/m == 001 */ { false, false, OS_ZERO },

    45   /* r/m == 010 */ { false, false, OS_ZERO },

    46   /* r/m == 011 */ { false, false, OS_ZERO },

    47   /* r/m == 100 */ { false, false, OS_ZERO },

    48   /* r/m == 101 */ { false, false, OS_ZERO },

    49   /* r/m == 110 */ { false, false, OS_ZERO },

    50   /* r/m == 111 */ { false, false, OS_ZERO }

    51 };

    53 const ModrmEntry MiniDisassembler::s_ia32_modrm_map_[] = {

    54 // mod == 00

    55   /* r/m == 000 */ { false, false, OS_ZERO },

    56   /* r/m == 001 */ { false, false, OS_ZERO },

    57   /* r/m == 010 */ { false, false, OS_ZERO },

    58   /* r/m == 011 */ { false, false, OS_ZERO },

    59   /* r/m == 100 */ { false, true, OS_ZERO },

    60   /* r/m == 101 */ { true, false, OS_DOUBLE_WORD },

    61   /* r/m == 110 */ { false, false, OS_ZERO },

    62   /* r/m == 111 */ { false, false, OS_ZERO },

    63 // mod == 01

    64   /* r/m == 000 */ { true, false, OS_BYTE },

    65   /* r/m == 001 */ { true, false, OS_BYTE },

    66   /* r/m == 010 */ { true, false, OS_BYTE },

    67   /* r/m == 011 */ { true, false, OS_BYTE },

    68   /* r/m == 100 */ { true, true, OS_BYTE },

    69   /* r/m == 101 */ { true, false, OS_BYTE },

    70   /* r/m == 110 */ { true, false, OS_BYTE },

    71   /* r/m == 111 */ { true, false, OS_BYTE },

    72 // mod == 10

    73   /* r/m == 000 */ { true, false, OS_DOUBLE_WORD },

    74   /* r/m == 001 */ { true, false, OS_DOUBLE_WORD },

    75   /* r/m == 010 */ { true, false, OS_DOUBLE_WORD },

    76   /* r/m == 011 */ { true, false, OS_DOUBLE_WORD },

    77   /* r/m == 100 */ { true, true, OS_DOUBLE_WORD },

    78   /* r/m == 101 */ { true, false, OS_DOUBLE_WORD },

    79   /* r/m == 110 */ { true, false, OS_DOUBLE_WORD },

    80   /* r/m == 111 */ { true, false, OS_DOUBLE_WORD },

    81 // mod == 11

    82   /* r/m == 000 */ { false, false, OS_ZERO },

    83   /* r/m == 001 */ { false, false, OS_ZERO },

    84   /* r/m == 010 */ { false, false, OS_ZERO },

    85   /* r/m == 011 */ { false, false, OS_ZERO },

    86   /* r/m == 100 */ { false, false, OS_ZERO },

    87   /* r/m == 101 */ { false, false, OS_ZERO },

    88   /* r/m == 110 */ { false, false, OS_ZERO },

    89   /* r/m == 111 */ { false, false, OS_ZERO },

    90 };

    92 };  // namespace sidestep

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