// Copyright (c) 2011 The Chromium Authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. #include "courgette/disassembler_win32_x86.h" #include #include "base/check.h" #include "courgette/assembly_program.h" #include "courgette/courgette.h" #include "courgette/rel32_finder_x86.h" #if COURGETTE_HISTOGRAM_TARGETS #include #endif namespace courgette { DisassemblerWin32X86::DisassemblerWin32X86(const uint8_t* start, size_t length) : DisassemblerWin32(start, length) {} RVA DisassemblerWin32X86::PointerToTargetRVA(const uint8_t* p) const { return Address32ToRVA(Read32LittleEndian(p)); } RVA DisassemblerWin32X86::Address32ToRVA(uint32_t address) const { if (address < image_base() || address >= image_base() + size_of_image_) return kNoRVA; return static_cast(address - image_base()); } CheckBool DisassemblerWin32X86::EmitAbs(Label* label, InstructionReceptor* receptor) const { return receptor->EmitAbs32(label); } void DisassemblerWin32X86::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; Rel32FinderX86 finder( base_relocation_table().address_, base_relocation_table().address_ + base_relocation_table().size_); 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