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1 // Copyright (c) 1994-2006 Sun Microsystems Inc. | 1 // Copyright (c) 1994-2006 Sun Microsystems Inc. |
2 // All Rights Reserved. | 2 // All Rights Reserved. |
3 // | 3 // |
4 // Redistribution and use in source and binary forms, with or without | 4 // Redistribution and use in source and binary forms, with or without |
5 // modification, are permitted provided that the following conditions | 5 // modification, are permitted provided that the following conditions |
6 // are met: | 6 // are met: |
7 // | 7 // |
8 // - Redistributions of source code must retain the above copyright notice, | 8 // - Redistributions of source code must retain the above copyright notice, |
9 // this list of conditions and the following disclaimer. | 9 // this list of conditions and the following disclaimer. |
10 // | 10 // |
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615 | 615 |
616 | 616 |
617 void Assembler::set_target_address_at(Address pc, Address constant_pool, | 617 void Assembler::set_target_address_at(Address pc, Address constant_pool, |
618 Address target, | 618 Address target, |
619 ICacheFlushMode icache_flush_mode) { | 619 ICacheFlushMode icache_flush_mode) { |
620 if (is_constant_pool_load(pc)) { | 620 if (is_constant_pool_load(pc)) { |
621 // This is a constant pool lookup. Update the entry in the constant pool. | 621 // This is a constant pool lookup. Update the entry in the constant pool. |
622 Memory::Address_at(constant_pool_entry_address(pc, constant_pool)) = target; | 622 Memory::Address_at(constant_pool_entry_address(pc, constant_pool)) = target; |
623 // Intuitively, we would think it is necessary to always flush the | 623 // Intuitively, we would think it is necessary to always flush the |
624 // instruction cache after patching a target address in the code as follows: | 624 // instruction cache after patching a target address in the code as follows: |
625 // CpuFeatures::FlushICache(pc, sizeof(target)); | 625 // Assembler::FlushICacheWithoutIsolate(pc, sizeof(target)); |
626 // However, on ARM, no instruction is actually patched in the case | 626 // However, on ARM, no instruction is actually patched in the case |
627 // of embedded constants of the form: | 627 // of embedded constants of the form: |
628 // ldr ip, [pp, #...] | 628 // ldr ip, [pp, #...] |
629 // since the instruction accessing this address in the constant pool remains | 629 // since the instruction accessing this address in the constant pool remains |
630 // unchanged. | 630 // unchanged. |
631 } else if (CpuFeatures::IsSupported(ARMv7)) { | 631 } else if (CpuFeatures::IsSupported(ARMv7)) { |
632 // This is an movw / movt immediate load. Patch the immediate embedded in | 632 // This is an movw / movt immediate load. Patch the immediate embedded in |
633 // the instructions. | 633 // the instructions. |
634 DCHECK(IsMovW(Memory::int32_at(pc))); | 634 DCHECK(IsMovW(Memory::int32_at(pc))); |
635 DCHECK(IsMovT(Memory::int32_at(pc + kInstrSize))); | 635 DCHECK(IsMovT(Memory::int32_at(pc + kInstrSize))); |
636 uint32_t* instr_ptr = reinterpret_cast<uint32_t*>(pc); | 636 uint32_t* instr_ptr = reinterpret_cast<uint32_t*>(pc); |
637 uint32_t immediate = reinterpret_cast<uint32_t>(target); | 637 uint32_t immediate = reinterpret_cast<uint32_t>(target); |
638 instr_ptr[0] = PatchMovwImmediate(instr_ptr[0], immediate & 0xFFFF); | 638 instr_ptr[0] = PatchMovwImmediate(instr_ptr[0], immediate & 0xFFFF); |
639 instr_ptr[1] = PatchMovwImmediate(instr_ptr[1], immediate >> 16); | 639 instr_ptr[1] = PatchMovwImmediate(instr_ptr[1], immediate >> 16); |
640 DCHECK(IsMovW(Memory::int32_at(pc))); | 640 DCHECK(IsMovW(Memory::int32_at(pc))); |
641 DCHECK(IsMovT(Memory::int32_at(pc + kInstrSize))); | 641 DCHECK(IsMovT(Memory::int32_at(pc + kInstrSize))); |
642 if (icache_flush_mode != SKIP_ICACHE_FLUSH) { | 642 if (icache_flush_mode != SKIP_ICACHE_FLUSH) { |
643 CpuFeatures::FlushICache(pc, 2 * kInstrSize); | 643 Assembler::FlushICacheWithoutIsolate(pc, 2 * kInstrSize); |
644 } | 644 } |
645 } else { | 645 } else { |
646 // This is an mov / orr immediate load. Patch the immediate embedded in | 646 // This is an mov / orr immediate load. Patch the immediate embedded in |
647 // the instructions. | 647 // the instructions. |
648 DCHECK(IsMovImmed(Memory::int32_at(pc)) && | 648 DCHECK(IsMovImmed(Memory::int32_at(pc)) && |
649 IsOrrImmed(Memory::int32_at(pc + kInstrSize)) && | 649 IsOrrImmed(Memory::int32_at(pc + kInstrSize)) && |
650 IsOrrImmed(Memory::int32_at(pc + 2 * kInstrSize)) && | 650 IsOrrImmed(Memory::int32_at(pc + 2 * kInstrSize)) && |
651 IsOrrImmed(Memory::int32_at(pc + 3 * kInstrSize))); | 651 IsOrrImmed(Memory::int32_at(pc + 3 * kInstrSize))); |
652 uint32_t* instr_ptr = reinterpret_cast<uint32_t*>(pc); | 652 uint32_t* instr_ptr = reinterpret_cast<uint32_t*>(pc); |
653 uint32_t immediate = reinterpret_cast<uint32_t>(target); | 653 uint32_t immediate = reinterpret_cast<uint32_t>(target); |
654 instr_ptr[0] = PatchShiftImm(instr_ptr[0], immediate & kImm8Mask); | 654 instr_ptr[0] = PatchShiftImm(instr_ptr[0], immediate & kImm8Mask); |
655 instr_ptr[1] = PatchShiftImm(instr_ptr[1], immediate & (kImm8Mask << 8)); | 655 instr_ptr[1] = PatchShiftImm(instr_ptr[1], immediate & (kImm8Mask << 8)); |
656 instr_ptr[2] = PatchShiftImm(instr_ptr[2], immediate & (kImm8Mask << 16)); | 656 instr_ptr[2] = PatchShiftImm(instr_ptr[2], immediate & (kImm8Mask << 16)); |
657 instr_ptr[3] = PatchShiftImm(instr_ptr[3], immediate & (kImm8Mask << 24)); | 657 instr_ptr[3] = PatchShiftImm(instr_ptr[3], immediate & (kImm8Mask << 24)); |
658 DCHECK(IsMovImmed(Memory::int32_at(pc)) && | 658 DCHECK(IsMovImmed(Memory::int32_at(pc)) && |
659 IsOrrImmed(Memory::int32_at(pc + kInstrSize)) && | 659 IsOrrImmed(Memory::int32_at(pc + kInstrSize)) && |
660 IsOrrImmed(Memory::int32_at(pc + 2 * kInstrSize)) && | 660 IsOrrImmed(Memory::int32_at(pc + 2 * kInstrSize)) && |
661 IsOrrImmed(Memory::int32_at(pc + 3 * kInstrSize))); | 661 IsOrrImmed(Memory::int32_at(pc + 3 * kInstrSize))); |
662 if (icache_flush_mode != SKIP_ICACHE_FLUSH) { | 662 if (icache_flush_mode != SKIP_ICACHE_FLUSH) { |
663 CpuFeatures::FlushICache(pc, 4 * kInstrSize); | 663 Assembler::FlushICacheWithoutIsolate(pc, 4 * kInstrSize); |
664 } | 664 } |
665 } | 665 } |
666 } | 666 } |
667 | 667 |
668 | 668 |
669 } } // namespace v8::internal | 669 } } // namespace v8::internal |
670 | 670 |
671 #endif // V8_ARM_ASSEMBLER_ARM_INL_H_ | 671 #endif // V8_ARM_ASSEMBLER_ARM_INL_H_ |
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