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/*
* Copyright (C) 2014 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 "calling_convention_x86_64.h"
#include "base/logging.h"
#include "handle_scope-inl.h"
#include "utils/x86_64/managed_register_x86_64.h"
#include "utils.h"
namespace art {
namespace x86_64 {
// Calling convention
ManagedRegister X86_64ManagedRuntimeCallingConvention::InterproceduralScratchRegister() {
return X86_64ManagedRegister::FromCpuRegister(RAX);
}
ManagedRegister X86_64JniCallingConvention::InterproceduralScratchRegister() {
return X86_64ManagedRegister::FromCpuRegister(RAX);
}
ManagedRegister X86_64JniCallingConvention::ReturnScratchRegister() const {
return ManagedRegister::NoRegister(); // No free regs, so assembler uses push/pop
}
static ManagedRegister ReturnRegisterForShorty(const char* shorty, bool jni) {
UNUSED(jni);
if (shorty[0] == 'F' || shorty[0] == 'D') {
return X86_64ManagedRegister::FromXmmRegister(XMM0);
} else if (shorty[0] == 'J') {
return X86_64ManagedRegister::FromCpuRegister(RAX);
} else if (shorty[0] == 'V') {
return ManagedRegister::NoRegister();
} else {
return X86_64ManagedRegister::FromCpuRegister(RAX);
}
}
ManagedRegister X86_64ManagedRuntimeCallingConvention::ReturnRegister() {
return ReturnRegisterForShorty(GetShorty(), false);
}
ManagedRegister X86_64JniCallingConvention::ReturnRegister() {
return ReturnRegisterForShorty(GetShorty(), true);
}
ManagedRegister X86_64JniCallingConvention::IntReturnRegister() {
return X86_64ManagedRegister::FromCpuRegister(RAX);
}
// Managed runtime calling convention
ManagedRegister X86_64ManagedRuntimeCallingConvention::MethodRegister() {
return X86_64ManagedRegister::FromCpuRegister(RDI);
}
bool X86_64ManagedRuntimeCallingConvention::IsCurrentParamInRegister() {
return !IsCurrentParamOnStack();
}
bool X86_64ManagedRuntimeCallingConvention::IsCurrentParamOnStack() {
// We assume all parameters are on stack, args coming via registers are spilled as entry_spills
return true;
}
ManagedRegister X86_64ManagedRuntimeCallingConvention::CurrentParamRegister() {
ManagedRegister res = ManagedRegister::NoRegister();
if (!IsCurrentParamAFloatOrDouble()) {
switch (itr_args_ - itr_float_and_doubles_) {
case 0: res = X86_64ManagedRegister::FromCpuRegister(RSI); break;
case 1: res = X86_64ManagedRegister::FromCpuRegister(RDX); break;
case 2: res = X86_64ManagedRegister::FromCpuRegister(RCX); break;
case 3: res = X86_64ManagedRegister::FromCpuRegister(R8); break;
case 4: res = X86_64ManagedRegister::FromCpuRegister(R9); break;
}
} else if (itr_float_and_doubles_ < 8) {
// First eight float parameters are passed via XMM0..XMM7
res = X86_64ManagedRegister::FromXmmRegister(
static_cast<FloatRegister>(XMM0 + itr_float_and_doubles_));
}
return res;
}
FrameOffset X86_64ManagedRuntimeCallingConvention::CurrentParamStackOffset() {
return FrameOffset(displacement_.Int32Value() + // displacement
sizeof(StackReference<mirror::ArtMethod>) + // Method ref
(itr_slots_ * sizeof(uint32_t))); // offset into in args
}
const ManagedRegisterEntrySpills& X86_64ManagedRuntimeCallingConvention::EntrySpills() {
// We spill the argument registers on X86 to free them up for scratch use, we then assume
// all arguments are on the stack.
if (entry_spills_.size() == 0) {
ResetIterator(FrameOffset(0));
while (HasNext()) {
ManagedRegister in_reg = CurrentParamRegister();
if (!in_reg.IsNoRegister()) {
int32_t size = IsParamALongOrDouble(itr_args_)? 8 : 4;
int32_t spill_offset = CurrentParamStackOffset().Uint32Value();
ManagedRegisterSpill spill(in_reg, size, spill_offset);
entry_spills_.push_back(spill);
}
Next();
}
}
return entry_spills_;
}
// JNI calling convention
X86_64JniCallingConvention::X86_64JniCallingConvention(bool is_static, bool is_synchronized,
const char* shorty)
: JniCallingConvention(is_static, is_synchronized, shorty, kFramePointerSize) {
callee_save_regs_.push_back(X86_64ManagedRegister::FromCpuRegister(RBX));
callee_save_regs_.push_back(X86_64ManagedRegister::FromCpuRegister(RBP));
callee_save_regs_.push_back(X86_64ManagedRegister::FromCpuRegister(R12));
callee_save_regs_.push_back(X86_64ManagedRegister::FromCpuRegister(R13));
callee_save_regs_.push_back(X86_64ManagedRegister::FromCpuRegister(R14));
callee_save_regs_.push_back(X86_64ManagedRegister::FromCpuRegister(R15));
callee_save_regs_.push_back(X86_64ManagedRegister::FromXmmRegister(XMM12));
callee_save_regs_.push_back(X86_64ManagedRegister::FromXmmRegister(XMM13));
callee_save_regs_.push_back(X86_64ManagedRegister::FromXmmRegister(XMM14));
callee_save_regs_.push_back(X86_64ManagedRegister::FromXmmRegister(XMM15));
}
uint32_t X86_64JniCallingConvention::CoreSpillMask() const {
return 1 << RBX | 1 << RBP | 1 << R12 | 1 << R13 | 1 << R14 | 1 << R15 |
1 << kNumberOfCpuRegisters;
}
uint32_t X86_64JniCallingConvention::FpSpillMask() const {
return 1 << XMM12 | 1 << XMM13 | 1 << XMM14 | 1 << XMM15;
}
size_t X86_64JniCallingConvention::FrameSize() {
// Method*, return address and callee save area size, local reference segment state
size_t frame_data_size = sizeof(StackReference<mirror::ArtMethod>) +
(2 + CalleeSaveRegisters().size()) * kFramePointerSize;
// References plus link_ (pointer) and number_of_references_ (uint32_t) for HandleScope header
size_t handle_scope_size = HandleScope::SizeOf(kFramePointerSize, ReferenceCount());
// Plus return value spill area size
return RoundUp(frame_data_size + handle_scope_size + SizeOfReturnValue(), kStackAlignment);
}
size_t X86_64JniCallingConvention::OutArgSize() {
return RoundUp(NumberOfOutgoingStackArgs() * kFramePointerSize, kStackAlignment);
}
bool X86_64JniCallingConvention::IsCurrentParamInRegister() {
return !IsCurrentParamOnStack();
}
bool X86_64JniCallingConvention::IsCurrentParamOnStack() {
return CurrentParamRegister().IsNoRegister();
}
ManagedRegister X86_64JniCallingConvention::CurrentParamRegister() {
ManagedRegister res = ManagedRegister::NoRegister();
if (!IsCurrentParamAFloatOrDouble()) {
switch (itr_args_ - itr_float_and_doubles_) {
case 0: res = X86_64ManagedRegister::FromCpuRegister(RDI); break;
case 1: res = X86_64ManagedRegister::FromCpuRegister(RSI); break;
case 2: res = X86_64ManagedRegister::FromCpuRegister(RDX); break;
case 3: res = X86_64ManagedRegister::FromCpuRegister(RCX); break;
case 4: res = X86_64ManagedRegister::FromCpuRegister(R8); break;
case 5: res = X86_64ManagedRegister::FromCpuRegister(R9); break;
}
} else if (itr_float_and_doubles_ < 8) {
// First eight float parameters are passed via XMM0..XMM7
res = X86_64ManagedRegister::FromXmmRegister(
static_cast<FloatRegister>(XMM0 + itr_float_and_doubles_));
}
return res;
}
FrameOffset X86_64JniCallingConvention::CurrentParamStackOffset() {
size_t offset = itr_args_
- std::min(8U, itr_float_and_doubles_) // Float arguments passed through Xmm0..Xmm7
- std::min(6U, itr_args_ - itr_float_and_doubles_); // Integer arguments passed through GPR
return FrameOffset(displacement_.Int32Value() - OutArgSize() + (offset * kFramePointerSize));
}
size_t X86_64JniCallingConvention::NumberOfOutgoingStackArgs() {
size_t static_args = IsStatic() ? 1 : 0; // count jclass
// regular argument parameters and this
size_t param_args = NumArgs() + NumLongOrDoubleArgs();
// count JNIEnv* and return pc (pushed after Method*)
size_t total_args = static_args + param_args + 2;
// Float arguments passed through Xmm0..Xmm7
// Other (integer) arguments passed through GPR (RDI, RSI, RDX, RCX, R8, R9)
size_t total_stack_args = total_args
- std::min(8U, static_cast<unsigned int>(NumFloatOrDoubleArgs()))
- std::min(6U, static_cast<unsigned int>(NumArgs() - NumFloatOrDoubleArgs()));
return total_stack_args;
}
} // namespace x86_64
} // namespace art
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