| // Copyright 2013 The Chromium Authors |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "courgette/disassembler_win32_x64.h" |
| |
| #include <algorithm> |
| |
| #include "base/check.h" |
| #include "base/numerics/safe_conversions.h" |
| #include "courgette/assembly_program.h" |
| #include "courgette/courgette.h" |
| #include "courgette/rel32_finder_x64.h" |
| |
| #if COURGETTE_HISTOGRAM_TARGETS |
| #include <iostream> |
| #endif |
| |
| namespace courgette { |
| |
| DisassemblerWin32X64::DisassemblerWin32X64(const uint8_t* start, size_t length) |
| : DisassemblerWin32(start, length) {} |
| |
| RVA DisassemblerWin32X64::PointerToTargetRVA(const uint8_t* p) const { |
| return Address64ToRVA(Read64LittleEndian(p)); |
| } |
| |
| RVA DisassemblerWin32X64::Address64ToRVA(uint64_t address) const { |
| if (address < image_base() || address >= image_base() + size_of_image_) |
| return kNoRVA; |
| return base::checked_cast<RVA>(address - image_base()); |
| } |
| |
| CheckBool DisassemblerWin32X64::EmitAbs(Label* label, |
| InstructionReceptor* receptor) const { |
| return receptor->EmitAbs64(label); |
| } |
| |
| void DisassemblerWin32X64::ParseRel32RelocsFromSection(const Section* section) { |
| // TODO(sra): use characteristic. |
| bool isCode = strcmp(section->name, ".text") == 0; |
| if (!isCode) |
| return; |
| |
| FileOffset start_file_offset = section->file_offset_of_raw_data; |
| // |virtual_size < size_of_raw_data| is possible. In this case, disassembly |
| // should not proceed beyond |virtual_size|, so rel32 location RVAs remain |
| // translatable to file offsets. |
| FileOffset end_file_offset = |
| start_file_offset + |
| std::min(section->virtual_size, section->size_of_raw_data); |
| |
| const uint8_t* start_pointer = FileOffsetToPointer(start_file_offset); |
| const uint8_t* end_pointer = FileOffsetToPointer(end_file_offset); |
| |
| RVA start_rva = FileOffsetToRVA(start_file_offset); |
| RVA end_rva = start_rva + section->virtual_size; |
| |
| Rel32FinderX64 finder( |
| base_relocation_table().address_, |
| base_relocation_table().address_ + base_relocation_table().size_, |
| size_of_image_); |
| finder.Find(start_pointer, end_pointer, start_rva, end_rva, abs32_locations_); |
| finder.SwapRel32Locations(&rel32_locations_); |
| |
| #if COURGETTE_HISTOGRAM_TARGETS |
| DCHECK(rel32_target_rvas_.empty()); |
| finder.SwapRel32TargetRVAs(&rel32_target_rvas_); |
| #endif |
| } |
| |
| } // namespace courgette |