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