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/*
* Copyright (C) 2013 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 "trampoline_compiler.h"
#include "jni_internal.h"
#include "utils/arm/assembler_arm.h"
#include "utils/mips/assembler_mips.h"
#include "utils/x86/assembler_x86.h"
#define __ assembler->
namespace art {
namespace arm {
static const std::vector<uint8_t>* CreateTrampoline(EntryPointCallingConvention abi,
ThreadOffset offset) {
UniquePtr<ArmAssembler> assembler(static_cast<ArmAssembler*>(Assembler::Create(kArm)));
switch (abi) {
case kInterpreterAbi: // Thread* is first argument (R0) in interpreter ABI.
__ LoadFromOffset(kLoadWord, PC, R0, offset.Int32Value());
break;
case kJniAbi: // Load via Thread* held in JNIEnv* in first argument (R0).
__ LoadFromOffset(kLoadWord, IP, R0, JNIEnvExt::SelfOffset().Int32Value());
__ LoadFromOffset(kLoadWord, PC, IP, offset.Int32Value());
break;
case kPortableAbi: // R9 holds Thread*.
case kQuickAbi: // Fall-through.
__ LoadFromOffset(kLoadWord, PC, R9, offset.Int32Value());
}
__ bkpt(0);
size_t cs = assembler->CodeSize();
UniquePtr<std::vector<uint8_t> > entry_stub(new std::vector<uint8_t>(cs));
MemoryRegion code(&(*entry_stub)[0], entry_stub->size());
assembler->FinalizeInstructions(code);
return entry_stub.release();
}
} // namespace arm
namespace mips {
static const std::vector<uint8_t>* CreateTrampoline(EntryPointCallingConvention abi,
ThreadOffset offset) {
UniquePtr<MipsAssembler> assembler(static_cast<MipsAssembler*>(Assembler::Create(kMips)));
switch (abi) {
case kInterpreterAbi: // Thread* is first argument (A0) in interpreter ABI.
__ LoadFromOffset(kLoadWord, T9, A0, offset.Int32Value());
break;
case kJniAbi: // Load via Thread* held in JNIEnv* in first argument (A0).
__ LoadFromOffset(kLoadWord, T9, A0, JNIEnvExt::SelfOffset().Int32Value());
__ LoadFromOffset(kLoadWord, T9, T9, offset.Int32Value());
break;
case kPortableAbi: // S1 holds Thread*.
case kQuickAbi: // Fall-through.
__ LoadFromOffset(kLoadWord, T9, S1, offset.Int32Value());
}
__ Jr(T9);
__ Nop();
__ Break();
size_t cs = assembler->CodeSize();
UniquePtr<std::vector<uint8_t> > entry_stub(new std::vector<uint8_t>(cs));
MemoryRegion code(&(*entry_stub)[0], entry_stub->size());
assembler->FinalizeInstructions(code);
return entry_stub.release();
}
} // namespace mips
namespace x86 {
static const std::vector<uint8_t>* CreateTrampoline(ThreadOffset offset) {
UniquePtr<X86Assembler> assembler(static_cast<X86Assembler*>(Assembler::Create(kX86)));
// All x86 trampolines call via the Thread* held in fs.
__ fs()->jmp(Address::Absolute(offset));
__ int3();
size_t cs = assembler->CodeSize();
UniquePtr<std::vector<uint8_t> > entry_stub(new std::vector<uint8_t>(cs));
MemoryRegion code(&(*entry_stub)[0], entry_stub->size());
assembler->FinalizeInstructions(code);
return entry_stub.release();
}
} // namespace x86
namespace x86_64 {
static const std::vector<uint8_t>* CreateTrampoline(ThreadOffset offset) {
UniquePtr<x86::X86Assembler> assembler(static_cast<x86::X86Assembler*>(Assembler::Create(kX86_64)));
// All x86 trampolines call via the Thread* held in gs.
__ gs()->jmp(x86::Address::Absolute(offset, true));
__ int3();
size_t cs = assembler->CodeSize();
UniquePtr<std::vector<uint8_t> > entry_stub(new std::vector<uint8_t>(cs));
MemoryRegion code(&(*entry_stub)[0], entry_stub->size());
assembler->FinalizeInstructions(code);
return entry_stub.release();
}
} // namespace x86_64
const std::vector<uint8_t>* CreateTrampoline(InstructionSet isa, EntryPointCallingConvention abi,
ThreadOffset offset) {
switch (isa) {
case kArm:
case kThumb2:
return arm::CreateTrampoline(abi, offset);
case kMips:
return mips::CreateTrampoline(abi, offset);
case kX86:
return x86::CreateTrampoline(offset);
case kX86_64:
return x86_64::CreateTrampoline(offset);
default:
LOG(FATAL) << "Unknown InstructionSet: " << isa;
return NULL;
}
}
} // namespace art
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