98 lines
3.9 KiB
C++
98 lines
3.9 KiB
C++
/*
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* Copyright (C) 2016 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 "linker/mips/relative_patcher_mips.h"
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#include "compiled_method.h"
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namespace art {
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namespace linker {
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uint32_t MipsRelativePatcher::ReserveSpace(
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uint32_t offset,
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const CompiledMethod* compiled_method ATTRIBUTE_UNUSED,
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MethodReference method_ref ATTRIBUTE_UNUSED) {
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return offset; // No space reserved; no limit on relative call distance.
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}
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uint32_t MipsRelativePatcher::ReserveSpaceEnd(uint32_t offset) {
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return offset; // No space reserved; no limit on relative call distance.
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}
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uint32_t MipsRelativePatcher::WriteThunks(OutputStream* out ATTRIBUTE_UNUSED, uint32_t offset) {
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return offset; // No thunks added; no limit on relative call distance.
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}
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void MipsRelativePatcher::PatchCall(std::vector<uint8_t>* code ATTRIBUTE_UNUSED,
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uint32_t literal_offset ATTRIBUTE_UNUSED,
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uint32_t patch_offset ATTRIBUTE_UNUSED,
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uint32_t target_offset ATTRIBUTE_UNUSED) {
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UNIMPLEMENTED(FATAL) << "PatchCall unimplemented on MIPS";
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}
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void MipsRelativePatcher::PatchPcRelativeReference(std::vector<uint8_t>* code,
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const LinkerPatch& patch,
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uint32_t patch_offset,
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uint32_t target_offset) {
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uint32_t anchor_literal_offset = patch.PcInsnOffset();
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uint32_t literal_offset = patch.LiteralOffset();
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bool high_patch = ((*code)[literal_offset + 0] == 0x34) && ((*code)[literal_offset + 1] == 0x12);
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// Perform basic sanity checks.
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if (high_patch) {
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if (is_r6) {
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// auipc reg, offset_high
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DCHECK_EQ(((*code)[literal_offset + 2] & 0x1F), 0x1E);
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DCHECK_EQ(((*code)[literal_offset + 3] & 0xFC), 0xEC);
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} else {
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// lui reg, offset_high
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DCHECK_EQ(((*code)[literal_offset + 2] & 0xE0), 0x00);
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DCHECK_EQ((*code)[literal_offset + 3], 0x3C);
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// addu reg, reg, reg2
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DCHECK_EQ((*code)[literal_offset + 4], 0x21);
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DCHECK_EQ(((*code)[literal_offset + 5] & 0x07), 0x00);
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DCHECK_EQ(((*code)[literal_offset + 7] & 0xFC), 0x00);
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}
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} else {
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// instr reg(s), offset_low
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CHECK_EQ((*code)[literal_offset + 0], 0x78);
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CHECK_EQ((*code)[literal_offset + 1], 0x56);
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}
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// Apply patch.
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uint32_t anchor_offset = patch_offset - literal_offset + anchor_literal_offset;
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uint32_t diff = target_offset - anchor_offset;
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diff += (diff & 0x8000) << 1; // Account for sign extension in "instr reg(s), offset_low".
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if (high_patch) {
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// lui reg, offset_high / auipc reg, offset_high
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(*code)[literal_offset + 0] = static_cast<uint8_t>(diff >> 16);
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(*code)[literal_offset + 1] = static_cast<uint8_t>(diff >> 24);
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} else {
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// instr reg(s), offset_low
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(*code)[literal_offset + 0] = static_cast<uint8_t>(diff >> 0);
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(*code)[literal_offset + 1] = static_cast<uint8_t>(diff >> 8);
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}
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}
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void MipsRelativePatcher::PatchBakerReadBarrierBranch(std::vector<uint8_t>* code ATTRIBUTE_UNUSED,
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const LinkerPatch& patch ATTRIBUTE_UNUSED,
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uint32_t patch_offset ATTRIBUTE_UNUSED) {
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LOG(FATAL) << "UNIMPLEMENTED";
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}
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} // namespace linker
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} // namespace art
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