83 lines
2.3 KiB
C++
83 lines
2.3 KiB
C++
/*
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* Copyright (C) 2014 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "berberis/assembler/machine_code.h"
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#include <string>
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#include "berberis/base/bit_util.h"
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#include "berberis/base/logging.h"
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namespace berberis {
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uint8_t* MachineCode::AddrOf(uint32_t offset) {
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CHECK_LT(offset, code_.size());
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return &code_[offset];
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}
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const uint8_t* MachineCode::AddrOf(uint32_t offset) const {
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CHECK_LT(offset, code_.size());
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return &code_[offset];
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}
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uint32_t MachineCode::Grow(uint32_t count) {
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size_t old_size = code_.size();
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code_.resize(old_size + count);
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return old_size;
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}
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inline char print_halfbyte(uint8_t b) {
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return b < 0xa ? b + '0' : (b - 0xa) + 'a';
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}
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void MachineCode::AsString(std::string* result) const {
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for (uint8_t insn : code_) {
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*result += print_halfbyte(insn >> 4);
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*result += print_halfbyte(insn & 0xf);
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*result += ' ';
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}
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}
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void MachineCode::PerformRelocations(const uint8_t* code, RecoveryMap* recovery_map) {
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for (const auto& rel : relocations_) {
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switch (rel.type) {
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case RelocationType::RelocAbsToDisp32: {
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intptr_t start = reinterpret_cast<intptr_t>(code);
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intptr_t pc = start + rel.pc;
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intptr_t disp = rel.data - pc;
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CHECK(IsInRange<int32_t>(disp));
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*AddrAs<int32_t>(rel.dst) = disp;
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break;
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}
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case RelocationType::RelocRecoveryPoint: {
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uintptr_t start = reinterpret_cast<uintptr_t>(code);
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uintptr_t fault_addr = start + rel.pc;
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uintptr_t recovery_addr = start + rel.data;
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(*recovery_map)[fault_addr] = recovery_addr;
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break;
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}
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}
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}
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}
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void MachineCode::DumpCode() const {
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std::string code_str;
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AsString(&code_str);
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ALOGE("%s\n", code_str.c_str());
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}
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} // namespace berberis
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