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// 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.
8
9#include "sandbox/win/src/sidestep/mini_disassembler.h"
10#include "sandbox/win/src/sidestep/mini_disassembler_types.h"
11
12namespace sidestep {
13
14const 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};
52
53const 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};
91
92};  // namespace sidestep
93