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/*
* Copyright (C) 2015 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "linker/relative_patcher.h"
#include "linker/arm/relative_patcher_thumb2.h"
#include "linker/arm64/relative_patcher_arm64.h"
#include "linker/x86/relative_patcher_x86.h"
#include "linker/x86_64/relative_patcher_x86_64.h"
#include "output_stream.h"
namespace art {
namespace linker {
std::unique_ptr<RelativePatcher> RelativePatcher::Create(
InstructionSet instruction_set, const InstructionSetFeatures* features,
RelativePatcherTargetProvider* provider) {
class RelativePatcherNone FINAL : public RelativePatcher {
public:
RelativePatcherNone() { }
uint32_t ReserveSpace(uint32_t offset,
const CompiledMethod* compiled_method ATTRIBUTE_UNUSED,
MethodReference method_ref ATTRIBUTE_UNUSED) OVERRIDE {
return offset; // No space reserved; no patches expected.
}
uint32_t ReserveSpaceEnd(uint32_t offset) OVERRIDE {
return offset; // No space reserved; no patches expected.
}
uint32_t WriteThunks(OutputStream* out ATTRIBUTE_UNUSED, uint32_t offset) OVERRIDE {
return offset; // No thunks added; no patches expected.
}
void PatchCall(std::vector<uint8_t>* code ATTRIBUTE_UNUSED,
uint32_t literal_offset ATTRIBUTE_UNUSED,
uint32_t patch_offset ATTRIBUTE_UNUSED,
uint32_t target_offset ATTRIBUTE_UNUSED) OVERRIDE {
LOG(FATAL) << "Unexpected relative call patch.";
}
virtual void PatchDexCacheReference(std::vector<uint8_t>* code ATTRIBUTE_UNUSED,
const LinkerPatch& patch ATTRIBUTE_UNUSED,
uint32_t patch_offset ATTRIBUTE_UNUSED,
uint32_t target_offset ATTRIBUTE_UNUSED) {
LOG(FATAL) << "Unexpected relative dex cache array patch.";
}
private:
DISALLOW_COPY_AND_ASSIGN(RelativePatcherNone);
};
switch (instruction_set) {
case kX86:
return std::unique_ptr<RelativePatcher>(new X86RelativePatcher());
case kX86_64:
return std::unique_ptr<RelativePatcher>(new X86_64RelativePatcher());
case kArm:
// Fall through: we generate Thumb2 code for "arm".
case kThumb2:
return std::unique_ptr<RelativePatcher>(new Thumb2RelativePatcher(provider));
case kArm64:
return std::unique_ptr<RelativePatcher>(
new Arm64RelativePatcher(provider, features->AsArm64InstructionSetFeatures()));
default:
return std::unique_ptr<RelativePatcher>(new RelativePatcherNone);
}
}
bool RelativePatcher::WriteCodeAlignment(OutputStream* out, uint32_t aligned_code_delta) {
static const uint8_t kPadding[] = {
0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u, 0u
};
DCHECK_LE(aligned_code_delta, sizeof(kPadding));
if (UNLIKELY(!out->WriteFully(kPadding, aligned_code_delta))) {
return false;
}
size_code_alignment_ += aligned_code_delta;
return true;
}
bool RelativePatcher::WriteRelCallThunk(OutputStream* out, const ArrayRef<const uint8_t>& thunk) {
if (UNLIKELY(!out->WriteFully(thunk.data(), thunk.size()))) {
return false;
}
size_relative_call_thunks_ += thunk.size();
return true;
}
bool RelativePatcher::WriteMiscThunk(OutputStream* out, const ArrayRef<const uint8_t>& thunk) {
if (UNLIKELY(!out->WriteFully(thunk.data(), thunk.size()))) {
return false;
}
size_misc_thunks_ += thunk.size();
return true;
}
} // namespace linker
} // namespace art
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