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1 // Copyright 2012 Google Inc. All Rights Reserved. | 1 // Copyright 2012 Google Inc. All Rights Reserved. |
2 // | 2 // |
3 // Licensed under the Apache License, Version 2.0 (the "License"); | 3 // Licensed under the Apache License, Version 2.0 (the "License"); |
4 // you may not use this file except in compliance with the License. | 4 // you may not use this file except in compliance with the License. |
5 // You may obtain a copy of the License at | 5 // You may obtain a copy of the License at |
6 // | 6 // |
7 // http://www.apache.org/licenses/LICENSE-2.0 | 7 // http://www.apache.org/licenses/LICENSE-2.0 |
8 // | 8 // |
9 // Unless required by applicable law or agreed to in writing, software | 9 // Unless required by applicable law or agreed to in writing, software |
10 // distributed under the License is distributed on an "AS IS" BASIS, | 10 // distributed under the License is distributed on an "AS IS" BASIS, |
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
12 // See the License for the specific language governing permissions and | 12 // See the License for the specific language governing permissions and |
13 // limitations under the License. | 13 // limitations under the License. |
14 | 14 |
15 #include "syzygy/core/disassembler_util.h" | 15 #include "syzygy/core/disassembler_util.h" |
16 | 16 |
| 17 #include <algorithm> |
| 18 |
17 #include "base/logging.h" | 19 #include "base/logging.h" |
18 #include "base/strings/stringprintf.h" | 20 #include "base/strings/stringprintf.h" |
19 #include "mnemonics.h" // NOLINT | 21 #include "mnemonics.h" // NOLINT |
20 | 22 |
21 namespace core { | 23 namespace core { |
22 | 24 |
23 namespace { | 25 namespace { |
24 | 26 |
25 // Return the size of a 3-byte VEX encoded instruction. | 27 // Return the size of a 3-byte VEX encoded instruction. |
26 // | 28 // |
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42 // | 44 // |
43 // |map_select| Indicates the opcode map that should be used for this | 45 // |map_select| Indicates the opcode map that should be used for this |
44 // instruction. | 46 // instruction. |
45 // | 47 // |
46 // See http://wiki.osdev.org/X86-64_Instruction_Encoding#Three_byte_VEX_escape_p
refix | 48 // See http://wiki.osdev.org/X86-64_Instruction_Encoding#Three_byte_VEX_escape_p
refix |
47 // for more details. | 49 // for more details. |
48 size_t Get3ByteVexEncodedInstructionSize(_CodeInfo* ci) { | 50 size_t Get3ByteVexEncodedInstructionSize(_CodeInfo* ci) { |
49 DCHECK_EQ(0xC4, ci->code[0]); | 51 DCHECK_EQ(0xC4, ci->code[0]); |
50 // Switch case based on the opcode map used by this instruction. | 52 // Switch case based on the opcode map used by this instruction. |
51 switch (ci->code[1] & 0x1F) { | 53 switch (ci->code[1] & 0x1F) { |
52 case 0x01: { | |
53 switch (ci->code[3]) { | |
54 case 0x1D: return 5; // vpermd | |
55 default: break; | |
56 } | |
57 break; | |
58 } | |
59 case 0x02: { | 54 case 0x02: { |
60 switch (ci->code[3]) { | 55 switch (ci->code[3]) { |
61 case 0x13: return 5; // vcvtps2ps | 56 case 0x13: return 5; // vcvtps2ps |
62 case 0x18: return 5; // vbroadcastss | 57 case 0x18: return 5; // vbroadcastss |
63 case 0x36: return 5; // vpermd | 58 case 0x36: return 5; // vpermd |
| 59 case 0x58: return 6; // vpbroadcastd |
64 case 0x5A: return 6; // vbroadcasti128 | 60 case 0x5A: return 6; // vbroadcasti128 |
65 case 0x78: return 5; // vpbroadcastb | 61 case 0x78: return 5; // vpbroadcastb |
66 default: break; | 62 case 0x8C: return 5; // vpmaskmovd |
| 63 case 0x8E: return 5; // vpmaskmovd |
| 64 case 0x90: return 6; // vpgatherdd |
| 65 default: |
| 66 break; |
67 } | 67 } |
68 break; | 68 break; |
69 } | 69 } |
70 case 0x03: { | 70 case 0x03: { |
71 switch (ci->code[3]) { | 71 switch (ci->code[3]) { |
72 case 0x00: return 6; // vpermq | 72 case 0x00: return 6; // vpermq |
73 case 0x1D: return 6; // vcvtps2ph | 73 case 0x1D: return 6; // vcvtps2ph |
74 case 0x38: return 7; // vinserti128 | 74 case 0x38: return 7; // vinserti128 |
75 case 0x39: return 6; // vextracti128 | 75 case 0x39: return 6; // vextracti128 |
76 default: break; | 76 default: break; |
77 } | 77 } |
78 break; | 78 break; |
79 } | 79 } |
80 default: | 80 default: |
81 break; | 81 break; |
82 } | 82 } |
| 83 |
| 84 // Print the instructions that we haven't been able to decompose in a format |
| 85 // that can easily be pasted into ODA (https://onlinedisassembler.com/). |
| 86 const int kMaxBytes = 10; |
| 87 size_t byte_count = std::min(ci->codeLen, kMaxBytes); |
| 88 std::string instruction_bytes; |
| 89 for (size_t i = 0; i < byte_count; ++i) { |
| 90 base::StringAppendF(&instruction_bytes, "%02X", ci->code[i]); |
| 91 if (i != byte_count - 1) |
| 92 instruction_bytes += " "; |
| 93 } |
| 94 if (ci->codeLen > kMaxBytes) |
| 95 instruction_bytes += "..."; |
| 96 LOG(WARNING) << "Failed to decompose a VEX encoded instructions with the " |
| 97 << "following bytes: " << instruction_bytes; |
83 return 0; | 98 return 0; |
84 } | 99 } |
85 | 100 |
86 void AdjustOperandSizeTo16Bit(_Operand* op) { | 101 void AdjustOperandSizeTo16Bit(_Operand* op) { |
87 DCHECK_EQ(32, op->size); | 102 DCHECK_EQ(32, op->size); |
88 | 103 |
89 op->size = 16; | 104 op->size = 16; |
90 if (op->type == O_REG) { | 105 if (op->type == O_REG) { |
91 DCHECK(op->index >= R_EAX && op->index < R_AX); | 106 DCHECK(op->index >= R_EAX && op->index < R_AX); |
92 // Size classes for registers are 16 indices apart. | 107 // Size classes for registers are 16 indices apart. |
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429 | 444 |
430 default: return assm::kRegisterNone; | 445 default: return assm::kRegisterNone; |
431 } | 446 } |
432 } | 447 } |
433 | 448 |
434 const Register& GetRegister(uint32_t distorm_reg_type) { | 449 const Register& GetRegister(uint32_t distorm_reg_type) { |
435 return Register::Get(GetRegisterId(distorm_reg_type)); | 450 return Register::Get(GetRegisterId(distorm_reg_type)); |
436 } | 451 } |
437 | 452 |
438 } // namespace core | 453 } // namespace core |
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