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| 1 // Copyright 2009 the V8 project authors. All rights reserved. | 1 // Copyright 2009 the V8 project authors. All rights reserved. |
| 2 // Redistribution and use in source and binary forms, with or without | 2 // Redistribution and use in source and binary forms, with or without |
| 3 // modification, are permitted provided that the following conditions are | 3 // modification, are permitted provided that the following conditions are |
| 4 // met: | 4 // met: |
| 5 // | 5 // |
| 6 // * Redistributions of source code must retain the above copyright | 6 // * Redistributions of source code must retain the above copyright |
| 7 // notice, this list of conditions and the following disclaimer. | 7 // notice, this list of conditions and the following disclaimer. |
| 8 // * Redistributions in binary form must reproduce the above | 8 // * Redistributions in binary form must reproduce the above |
| 9 // copyright notice, this list of conditions and the following | 9 // copyright notice, this list of conditions and the following |
| 10 // disclaimer in the documentation and/or other materials provided | 10 // disclaimer in the documentation and/or other materials provided |
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| 680 | 680 |
| 681 int DisassemblerX64::ShiftInstruction(byte* data) { | 681 int DisassemblerX64::ShiftInstruction(byte* data) { |
| 682 byte op = *data & (~1); | 682 byte op = *data & (~1); |
| 683 if (op != 0xD0 && op != 0xD2 && op != 0xC0) { | 683 if (op != 0xD0 && op != 0xD2 && op != 0xC0) { |
| 684 UnimplementedInstruction(); | 684 UnimplementedInstruction(); |
| 685 return 1; | 685 return 1; |
| 686 } | 686 } |
| 687 byte modrm = *(data + 1); | 687 byte modrm = *(data + 1); |
| 688 int mod, regop, rm; | 688 int mod, regop, rm; |
| 689 get_modrm(modrm, &mod, ®op, &rm); | 689 get_modrm(modrm, &mod, ®op, &rm); |
| 690 ASSERT(regop < 8); | 690 regop &= 0x7; // The REX.R bit does not affect the operation. |
| 691 int imm8 = -1; | 691 int imm8 = -1; |
| 692 int num_bytes = 2; | 692 int num_bytes = 2; |
| 693 if (mod != 3) { | 693 if (mod != 3) { |
| 694 UnimplementedInstruction(); | 694 UnimplementedInstruction(); |
| 695 return num_bytes; | 695 return num_bytes; |
| 696 } | 696 } |
| 697 const char* mnem = NULL; | 697 const char* mnem = NULL; |
| 698 switch (regop) { | 698 switch (regop) { |
| 699 case 0: | 699 case 0: |
| 700 mnem = "rol"; | 700 mnem = "rol"; |
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| 1524 fprintf(f, "%02x", *bp); | 1524 fprintf(f, "%02x", *bp); |
| 1525 } | 1525 } |
| 1526 for (int i = 6 - (pc - prev_pc); i >= 0; i--) { | 1526 for (int i = 6 - (pc - prev_pc); i >= 0; i--) { |
| 1527 fprintf(f, " "); | 1527 fprintf(f, " "); |
| 1528 } | 1528 } |
| 1529 fprintf(f, " %s\n", buffer.start()); | 1529 fprintf(f, " %s\n", buffer.start()); |
| 1530 } | 1530 } |
| 1531 } | 1531 } |
| 1532 | 1532 |
| 1533 } // namespace disasm | 1533 } // namespace disasm |
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