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74 lines
3.3 KiB
74 lines
3.3 KiB
/*
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* Copyright (C) 2015 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/x86/relative_patcher_x86.h"
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#include "compiled_method.h"
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#include "linker/linker_patch.h"
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namespace art {
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namespace linker {
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void X86RelativePatcher::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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// Check that the anchor points to pop in a "call +0; pop <reg>" sequence.
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DCHECK_GE(anchor_literal_offset, 5u);
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DCHECK_LT(anchor_literal_offset, code->size());
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DCHECK_EQ((*code)[anchor_literal_offset - 5u], 0xe8u);
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DCHECK_EQ((*code)[anchor_literal_offset - 4u], 0x00u);
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DCHECK_EQ((*code)[anchor_literal_offset - 3u], 0x00u);
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DCHECK_EQ((*code)[anchor_literal_offset - 2u], 0x00u);
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DCHECK_EQ((*code)[anchor_literal_offset - 1u], 0x00u);
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DCHECK_EQ((*code)[anchor_literal_offset] & 0xf8u, 0x58u);
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// Check that the patched data contains kPlaceholder32BitOffset.
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// Must match CodeGeneratorX86_64::kPlaceholder32BitOffset.
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constexpr int kPlaceholder32BitOffset = 256;
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DCHECK_LE(literal_offset, code->size());
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DCHECK_EQ((*code)[literal_offset + 0u], static_cast<uint8_t>(kPlaceholder32BitOffset >> 0));
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DCHECK_EQ((*code)[literal_offset + 1u], static_cast<uint8_t>(kPlaceholder32BitOffset >> 8));
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DCHECK_EQ((*code)[literal_offset + 2u], static_cast<uint8_t>(kPlaceholder32BitOffset >> 16));
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DCHECK_EQ((*code)[literal_offset + 3u], static_cast<uint8_t>(kPlaceholder32BitOffset >> 24));
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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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(*code)[literal_offset + 0u] = static_cast<uint8_t>(diff >> 0);
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(*code)[literal_offset + 1u] = static_cast<uint8_t>(diff >> 8);
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(*code)[literal_offset + 2u] = static_cast<uint8_t>(diff >> 16);
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(*code)[literal_offset + 3u] = static_cast<uint8_t>(diff >> 24);
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}
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void X86RelativePatcher::PatchEntrypointCall(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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void X86RelativePatcher::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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