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// Copyright (c) 2021, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
#include "vm/globals.h" // Needed here to get TARGET_ARCH_RISCV.
#if defined(TARGET_ARCH_RISCV32) || defined(TARGET_ARCH_RISCV64)
#include "vm/code_patcher.h"
#include "vm/cpu.h"
#include "vm/instructions.h"
#include "vm/object.h"
namespace dart {
class PoolPointerCall : public ValueObject {
public:
PoolPointerCall(uword pc, const Code& code)
: end_(pc), object_pool_(ObjectPool::Handle(code.GetObjectPool())) {
ASSERT(*reinterpret_cast<uint16_t*>(end_ - 2) == 0x9082); // jalr ra
uint32_t load_entry = LoadUnaligned(reinterpret_cast<uint32_t*>(end_ - 6));
#if XLEN == 32
ASSERT((load_entry == 0x00362083) || // lw ra, entry(code)
(load_entry == 0x00b62083)); // lw ra, unchecked_entry(code)
#elif XLEN == 64
ASSERT((load_entry == 0x00763083) || // ld ra, entry(code)
(load_entry = 0x01763083)); // ld ra, unchecked_entry(code)
#endif
InstructionPattern::DecodeLoadWordFromPool(end_ - 6, &reg_, &index_);
}
intptr_t pp_index() const { return index_; }
CodePtr Target() const {
return static_cast<CodePtr>(object_pool_.ObjectAt(pp_index()));
}
void SetTarget(const Code& target) const {
object_pool_.SetObjectAt(pp_index(), target);
// No need to flush the instruction cache, since the code is not modified.
}
private:
uword end_;
const ObjectPool& object_pool_;
Register reg_;
intptr_t index_;
DISALLOW_IMPLICIT_CONSTRUCTORS(PoolPointerCall);
};
CodePtr CodePatcher::GetStaticCallTargetAt(uword return_address,
const Code& code) {
ASSERT(code.ContainsInstructionAt(return_address));
PoolPointerCall call(return_address, code);
return call.Target();
}
void CodePatcher::PatchStaticCallAt(uword return_address,
const Code& code,
const Code& new_target) {
PatchPoolPointerCallAt(return_address, code, new_target);
}
void CodePatcher::PatchPoolPointerCallAt(uword return_address,
const Code& code,
const Code& new_target) {
ASSERT(code.ContainsInstructionAt(return_address));
PoolPointerCall call(return_address, code);
call.SetTarget(new_target);
}
void CodePatcher::InsertDeoptimizationCallAt(uword start) {
UNREACHABLE();
}
CodePtr CodePatcher::GetInstanceCallAt(uword return_address,
const Code& caller_code,
Object* data) {
ASSERT(caller_code.ContainsInstructionAt(return_address));
ICCallPattern call(return_address, caller_code);
if (data != nullptr) {
*data = call.Data();
}
return call.TargetCode();
}
void CodePatcher::PatchInstanceCallAt(uword return_address,
const Code& caller_code,
const Object& data,
const Code& target) {
auto thread = Thread::Current();
thread->isolate_group()->RunWithStoppedMutators([&]() {
PatchInstanceCallAtWithMutatorsStopped(thread, return_address, caller_code,
data, target);
});
}
void CodePatcher::PatchInstanceCallAtWithMutatorsStopped(
Thread* thread,
uword return_address,
const Code& caller_code,
const Object& data,
const Code& target) {
ASSERT(caller_code.ContainsInstructionAt(return_address));
ICCallPattern call(return_address, caller_code);
call.SetData(data);
call.SetTargetCode(target);
}
FunctionPtr CodePatcher::GetUnoptimizedStaticCallAt(uword return_address,
const Code& code,
ICData* ic_data_result) {
ASSERT(code.ContainsInstructionAt(return_address));
ICCallPattern static_call(return_address, code);
ICData& ic_data = ICData::Handle();
ic_data ^= static_call.Data();
if (ic_data_result != nullptr) {
*ic_data_result = ic_data.ptr();
}
return ic_data.GetTargetAt(0);
}
void CodePatcher::PatchSwitchableCallAt(uword return_address,
const Code& caller_code,
const Object& data,
const Code& target) {
auto thread = Thread::Current();
// Ensure all threads are suspended as we update data and target pair.
thread->isolate_group()->RunWithStoppedMutators([&]() {
PatchSwitchableCallAtWithMutatorsStopped(thread, return_address,
caller_code, data, target);
});
}
void CodePatcher::PatchSwitchableCallAtWithMutatorsStopped(
Thread* thread,
uword return_address,
const Code& caller_code,
const Object& data,
const Code& target) {
if (FLAG_precompiled_mode) {
BareSwitchableCallPattern call(return_address);
call.SetData(data);
call.SetTarget(target);
} else {
SwitchableCallPattern call(return_address, caller_code);
call.SetData(data);
call.SetTarget(target);
}
}
uword CodePatcher::GetSwitchableCallTargetEntryAt(uword return_address,
const Code& caller_code) {
if (FLAG_precompiled_mode) {
BareSwitchableCallPattern call(return_address);
return call.target_entry();
} else {
SwitchableCallPattern call(return_address, caller_code);
return call.target_entry();
}
}
ObjectPtr CodePatcher::GetSwitchableCallDataAt(uword return_address,
const Code& caller_code) {
if (FLAG_precompiled_mode) {
BareSwitchableCallPattern call(return_address);
return call.data();
} else {
SwitchableCallPattern call(return_address, caller_code);
return call.data();
}
}
void CodePatcher::PatchNativeCallAt(uword return_address,
const Code& caller_code,
NativeFunction target,
const Code& trampoline) {
Thread::Current()->isolate_group()->RunWithStoppedMutators([&]() {
ASSERT(caller_code.ContainsInstructionAt(return_address));
NativeCallPattern call(return_address, caller_code);
call.set_target(trampoline);
call.set_native_function(target);
});
}
CodePtr CodePatcher::GetNativeCallAt(uword return_address,
const Code& caller_code,
NativeFunction* target) {
ASSERT(caller_code.ContainsInstructionAt(return_address));
NativeCallPattern call(return_address, caller_code);
*target = call.native_function();
return call.target();
}
} // namespace dart
#endif // defined TARGET_ARCH_RISCV