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59 lines
2.2 KiB
59 lines
2.2 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_base.h"
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#include "debug/method_debug_info.h"
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namespace art {
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namespace linker {
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uint32_t X86BaseRelativePatcher::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 X86BaseRelativePatcher::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 X86BaseRelativePatcher::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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std::vector<debug::MethodDebugInfo> X86BaseRelativePatcher::GenerateThunkDebugInfo(
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uint32_t executable_offset ATTRIBUTE_UNUSED) {
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return std::vector<debug::MethodDebugInfo>(); // No thunks added.
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}
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void X86BaseRelativePatcher::PatchCall(std::vector<uint8_t>* code,
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uint32_t literal_offset,
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uint32_t patch_offset,
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uint32_t target_offset) {
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DCHECK_LE(literal_offset + 4u, code->size());
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// Unsigned arithmetic with its well-defined overflow behavior is just fine here.
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uint32_t displacement = target_offset - patch_offset;
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displacement -= kPcDisplacement; // The base PC is at the end of the 4-byte patch.
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using unaligned_int32_t __attribute__((__aligned__(1))) = int32_t;
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reinterpret_cast<unaligned_int32_t*>(&(*code)[literal_offset])[0] = displacement;
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}
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} // namespace linker
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} // namespace art
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