| /* |
| * 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/bit_utils.h" |
| #include "base/logging.h" |
| #include "handle_scope-inl.h" |
| #include "utils/x86_64/managed_register_x86_64.h" |
| |
| namespace art { |
| namespace x86_64 { |
| |
| constexpr size_t kFramePointerSize = static_cast<size_t>(PointerSize::k64); |
| static_assert(kX86_64PointerSize == PointerSize::k64, "Unexpected x86_64 pointer size"); |
| static_assert(kStackAlignment >= 16u, "System V AMD64 ABI requires at least 16 byte stack alignment"); |
| |
| // XMM0..XMM7 can be used to pass the first 8 floating args. The rest must go on the stack. |
| // -- Managed and JNI calling conventions. |
| constexpr size_t kMaxFloatOrDoubleRegisterArguments = 8u; |
| // Up to how many integer-like (pointers, objects, longs, int, short, bool, etc) args can be |
| // enregistered. The rest of the args must go on the stack. |
| // -- JNI calling convention only (Managed excludes RDI, so it's actually 5). |
| constexpr size_t kMaxIntLikeRegisterArguments = 6u; |
| |
| static constexpr ManagedRegister kCalleeSaveRegisters[] = { |
| // Core registers. |
| X86_64ManagedRegister::FromCpuRegister(RBX), |
| X86_64ManagedRegister::FromCpuRegister(RBP), |
| X86_64ManagedRegister::FromCpuRegister(R12), |
| X86_64ManagedRegister::FromCpuRegister(R13), |
| X86_64ManagedRegister::FromCpuRegister(R14), |
| X86_64ManagedRegister::FromCpuRegister(R15), |
| // Hard float registers. |
| X86_64ManagedRegister::FromXmmRegister(XMM12), |
| X86_64ManagedRegister::FromXmmRegister(XMM13), |
| X86_64ManagedRegister::FromXmmRegister(XMM14), |
| X86_64ManagedRegister::FromXmmRegister(XMM15), |
| }; |
| |
| static constexpr uint32_t CalculateCoreCalleeSpillMask() { |
| // The spilled PC gets a special marker. |
| uint32_t result = 1 << kNumberOfCpuRegisters; |
| for (auto&& r : kCalleeSaveRegisters) { |
| if (r.AsX86_64().IsCpuRegister()) { |
| result |= (1 << r.AsX86_64().AsCpuRegister().AsRegister()); |
| } |
| } |
| return result; |
| } |
| |
| static constexpr uint32_t CalculateFpCalleeSpillMask() { |
| uint32_t result = 0; |
| for (auto&& r : kCalleeSaveRegisters) { |
| if (r.AsX86_64().IsXmmRegister()) { |
| result |= (1 << r.AsX86_64().AsXmmRegister().AsFloatRegister()); |
| } |
| } |
| return result; |
| } |
| |
| static constexpr uint32_t kCoreCalleeSpillMask = CalculateCoreCalleeSpillMask(); |
| static constexpr uint32_t kFpCalleeSpillMask = CalculateFpCalleeSpillMask(); |
| |
| // 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 ATTRIBUTE_UNUSED) { |
| 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_ < kMaxFloatOrDoubleRegisterArguments) { |
| // 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 |
| static_cast<size_t>(kX86_64PointerSize) + // 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, |
| bool is_critical_native, |
| const char* shorty) |
| : JniCallingConvention(is_static, |
| is_synchronized, |
| is_critical_native, |
| shorty, |
| kX86_64PointerSize) { |
| } |
| |
| uint32_t X86_64JniCallingConvention::CoreSpillMask() const { |
| return kCoreCalleeSpillMask; |
| } |
| |
| uint32_t X86_64JniCallingConvention::FpSpillMask() const { |
| return kFpCalleeSpillMask; |
| } |
| |
| size_t X86_64JniCallingConvention::FrameSize() { |
| // Method*, PC return address and callee save area size, local reference segment state |
| const size_t method_ptr_size = static_cast<size_t>(kX86_64PointerSize); |
| const size_t pc_return_addr_size = kFramePointerSize; |
| const size_t callee_save_area_size = CalleeSaveRegisters().size() * kFramePointerSize; |
| size_t frame_data_size = method_ptr_size + pc_return_addr_size + callee_save_area_size; |
| |
| if (LIKELY(HasLocalReferenceSegmentState())) { // local ref. segment state |
| // Local reference segment state is sometimes excluded. |
| frame_data_size += kFramePointerSize; |
| } |
| |
| // References plus link_ (pointer) and number_of_references_ (uint32_t) for HandleScope header |
| const size_t handle_scope_size = HandleScope::SizeOf(kX86_64PointerSize, ReferenceCount()); |
| |
| size_t total_size = frame_data_size; |
| if (LIKELY(HasHandleScope())) { |
| // HandleScope is sometimes excluded. |
| total_size += handle_scope_size; // handle scope size |
| } |
| |
| // Plus return value spill area size |
| total_size += SizeOfReturnValue(); |
| |
| return RoundUp(total_size, kStackAlignment); |
| } |
| |
| size_t X86_64JniCallingConvention::OutArgSize() { |
| return RoundUp(NumberOfOutgoingStackArgs() * kFramePointerSize, kStackAlignment); |
| } |
| |
| ArrayRef<const ManagedRegister> X86_64JniCallingConvention::CalleeSaveRegisters() const { |
| return ArrayRef<const ManagedRegister>(kCalleeSaveRegisters); |
| } |
| |
| 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; |
| static_assert(5u == kMaxIntLikeRegisterArguments - 1, "Missing case statement(s)"); |
| } |
| } else if (itr_float_and_doubles_ < kMaxFloatOrDoubleRegisterArguments) { |
| // 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() { |
| CHECK(IsCurrentParamOnStack()); |
| size_t args_on_stack = itr_args_ |
| - std::min(kMaxFloatOrDoubleRegisterArguments, |
| static_cast<size_t>(itr_float_and_doubles_)) |
| // Float arguments passed through Xmm0..Xmm7 |
| - std::min(kMaxIntLikeRegisterArguments, |
| static_cast<size_t>(itr_args_ - itr_float_and_doubles_)); |
| // Integer arguments passed through GPR |
| size_t offset = displacement_.Int32Value() - OutArgSize() + (args_on_stack * kFramePointerSize); |
| CHECK_LT(offset, OutArgSize()); |
| return FrameOffset(offset); |
| } |
| |
| // TODO: Calling this "NumberArgs" is misleading. |
| // It's really more like NumberSlots (like itr_slots_) |
| // because doubles/longs get counted twice. |
| size_t X86_64JniCallingConvention::NumberOfOutgoingStackArgs() { |
| size_t static_args = HasSelfClass() ? 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 internal_args = 1 /* return pc */ + (HasJniEnv() ? 1 : 0 /* jni env */); |
| size_t total_args = static_args + param_args + internal_args; |
| |
| // 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(kMaxFloatOrDoubleRegisterArguments, static_cast<size_t>(NumFloatOrDoubleArgs())) |
| - std::min(kMaxIntLikeRegisterArguments, static_cast<size_t>(NumArgs() - NumFloatOrDoubleArgs())); |
| |
| return total_stack_args; |
| } |
| |
| } // namespace x86_64 |
| } // namespace art |