1 /*
2 * Copyright (C) 2014 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "calling_convention_x86_64.h"
18
19 #include "base/logging.h"
20 #include "utils/x86_64/managed_register_x86_64.h"
21 #include "utils.h"
22
23 namespace art {
24 namespace x86_64 {
25
26 // Calling convention
27
InterproceduralScratchRegister()28 ManagedRegister X86_64ManagedRuntimeCallingConvention::InterproceduralScratchRegister() {
29 return X86_64ManagedRegister::FromCpuRegister(RAX);
30 }
31
InterproceduralScratchRegister()32 ManagedRegister X86_64JniCallingConvention::InterproceduralScratchRegister() {
33 return X86_64ManagedRegister::FromCpuRegister(RAX);
34 }
35
ReturnScratchRegister() const36 ManagedRegister X86_64JniCallingConvention::ReturnScratchRegister() const {
37 return ManagedRegister::NoRegister(); // No free regs, so assembler uses push/pop
38 }
39
ReturnRegisterForShorty(const char * shorty,bool jni)40 static ManagedRegister ReturnRegisterForShorty(const char* shorty, bool jni) {
41 if (shorty[0] == 'F' || shorty[0] == 'D') {
42 return X86_64ManagedRegister::FromXmmRegister(XMM0);
43 } else if (shorty[0] == 'J') {
44 return X86_64ManagedRegister::FromCpuRegister(RAX);
45 } else if (shorty[0] == 'V') {
46 return ManagedRegister::NoRegister();
47 } else {
48 return X86_64ManagedRegister::FromCpuRegister(RAX);
49 }
50 }
51
ReturnRegister()52 ManagedRegister X86_64ManagedRuntimeCallingConvention::ReturnRegister() {
53 return ReturnRegisterForShorty(GetShorty(), false);
54 }
55
ReturnRegister()56 ManagedRegister X86_64JniCallingConvention::ReturnRegister() {
57 return ReturnRegisterForShorty(GetShorty(), true);
58 }
59
IntReturnRegister()60 ManagedRegister X86_64JniCallingConvention::IntReturnRegister() {
61 return X86_64ManagedRegister::FromCpuRegister(RAX);
62 }
63
64 // Managed runtime calling convention
65
MethodRegister()66 ManagedRegister X86_64ManagedRuntimeCallingConvention::MethodRegister() {
67 return X86_64ManagedRegister::FromCpuRegister(RDI);
68 }
69
IsCurrentParamInRegister()70 bool X86_64ManagedRuntimeCallingConvention::IsCurrentParamInRegister() {
71 return !IsCurrentParamOnStack();
72 }
73
IsCurrentParamOnStack()74 bool X86_64ManagedRuntimeCallingConvention::IsCurrentParamOnStack() {
75 // We assume all parameters are on stack, args coming via registers are spilled as entry_spills
76 return true;
77 }
78
CurrentParamRegister()79 ManagedRegister X86_64ManagedRuntimeCallingConvention::CurrentParamRegister() {
80 ManagedRegister res = ManagedRegister::NoRegister();
81 if (!IsCurrentParamAFloatOrDouble()) {
82 switch (itr_args_ - itr_float_and_doubles_) {
83 case 0: res = X86_64ManagedRegister::FromCpuRegister(RSI); break;
84 case 1: res = X86_64ManagedRegister::FromCpuRegister(RDX); break;
85 case 2: res = X86_64ManagedRegister::FromCpuRegister(RCX); break;
86 case 3: res = X86_64ManagedRegister::FromCpuRegister(R8); break;
87 case 4: res = X86_64ManagedRegister::FromCpuRegister(R9); break;
88 }
89 } else if (itr_float_and_doubles_ < 8) {
90 // First eight float parameters are passed via XMM0..XMM7
91 res = X86_64ManagedRegister::FromXmmRegister(
92 static_cast<FloatRegister>(XMM0 + itr_float_and_doubles_));
93 }
94 return res;
95 }
96
CurrentParamStackOffset()97 FrameOffset X86_64ManagedRuntimeCallingConvention::CurrentParamStackOffset() {
98 return FrameOffset(displacement_.Int32Value() + // displacement
99 sizeof(StackReference<mirror::ArtMethod>) + // Method ref
100 (itr_slots_ * sizeof(uint32_t))); // offset into in args
101 }
102
EntrySpills()103 const ManagedRegisterEntrySpills& X86_64ManagedRuntimeCallingConvention::EntrySpills() {
104 // We spill the argument registers on X86 to free them up for scratch use, we then assume
105 // all arguments are on the stack.
106 if (entry_spills_.size() == 0) {
107 ResetIterator(FrameOffset(0));
108 while (HasNext()) {
109 ManagedRegister in_reg = CurrentParamRegister();
110 if (!in_reg.IsNoRegister()) {
111 int32_t size = IsParamALongOrDouble(itr_args_)? 8 : 4;
112 int32_t spill_offset = CurrentParamStackOffset().Uint32Value();
113 ManagedRegisterSpill spill(in_reg, size, spill_offset);
114 entry_spills_.push_back(spill);
115 }
116 Next();
117 }
118 }
119 return entry_spills_;
120 }
121
122 // JNI calling convention
123
X86_64JniCallingConvention(bool is_static,bool is_synchronized,const char * shorty)124 X86_64JniCallingConvention::X86_64JniCallingConvention(bool is_static, bool is_synchronized,
125 const char* shorty)
126 : JniCallingConvention(is_static, is_synchronized, shorty, kFramePointerSize) {
127 callee_save_regs_.push_back(X86_64ManagedRegister::FromCpuRegister(RBX));
128 callee_save_regs_.push_back(X86_64ManagedRegister::FromCpuRegister(RBP));
129 callee_save_regs_.push_back(X86_64ManagedRegister::FromCpuRegister(R12));
130 callee_save_regs_.push_back(X86_64ManagedRegister::FromCpuRegister(R13));
131 callee_save_regs_.push_back(X86_64ManagedRegister::FromCpuRegister(R14));
132 callee_save_regs_.push_back(X86_64ManagedRegister::FromCpuRegister(R15));
133 callee_save_regs_.push_back(X86_64ManagedRegister::FromXmmRegister(XMM12));
134 callee_save_regs_.push_back(X86_64ManagedRegister::FromXmmRegister(XMM13));
135 callee_save_regs_.push_back(X86_64ManagedRegister::FromXmmRegister(XMM14));
136 callee_save_regs_.push_back(X86_64ManagedRegister::FromXmmRegister(XMM15));
137 }
138
CoreSpillMask() const139 uint32_t X86_64JniCallingConvention::CoreSpillMask() const {
140 return 1 << RBX | 1 << RBP | 1 << R12 | 1 << R13 | 1 << R14 | 1 << R15 |
141 1 << kNumberOfCpuRegisters;
142 }
143
FpSpillMask() const144 uint32_t X86_64JniCallingConvention::FpSpillMask() const {
145 return 1 << XMM12 | 1 << XMM13 | 1 << XMM14 | 1 << XMM15;
146 }
147
FrameSize()148 size_t X86_64JniCallingConvention::FrameSize() {
149 // Method*, return address and callee save area size, local reference segment state
150 size_t frame_data_size = sizeof(StackReference<mirror::ArtMethod>) +
151 (2 + CalleeSaveRegisters().size()) * kFramePointerSize;
152 // References plus link_ (pointer) and number_of_references_ (uint32_t) for HandleScope header
153 size_t handle_scope_size = HandleScope::SizeOf(kFramePointerSize, ReferenceCount());
154 // Plus return value spill area size
155 return RoundUp(frame_data_size + handle_scope_size + SizeOfReturnValue(), kStackAlignment);
156 }
157
OutArgSize()158 size_t X86_64JniCallingConvention::OutArgSize() {
159 return RoundUp(NumberOfOutgoingStackArgs() * kFramePointerSize, kStackAlignment);
160 }
161
IsCurrentParamInRegister()162 bool X86_64JniCallingConvention::IsCurrentParamInRegister() {
163 return !IsCurrentParamOnStack();
164 }
165
IsCurrentParamOnStack()166 bool X86_64JniCallingConvention::IsCurrentParamOnStack() {
167 return CurrentParamRegister().IsNoRegister();
168 }
169
CurrentParamRegister()170 ManagedRegister X86_64JniCallingConvention::CurrentParamRegister() {
171 ManagedRegister res = ManagedRegister::NoRegister();
172 if (!IsCurrentParamAFloatOrDouble()) {
173 switch (itr_args_ - itr_float_and_doubles_) {
174 case 0: res = X86_64ManagedRegister::FromCpuRegister(RDI); break;
175 case 1: res = X86_64ManagedRegister::FromCpuRegister(RSI); break;
176 case 2: res = X86_64ManagedRegister::FromCpuRegister(RDX); break;
177 case 3: res = X86_64ManagedRegister::FromCpuRegister(RCX); break;
178 case 4: res = X86_64ManagedRegister::FromCpuRegister(R8); break;
179 case 5: res = X86_64ManagedRegister::FromCpuRegister(R9); break;
180 }
181 } else if (itr_float_and_doubles_ < 8) {
182 // First eight float parameters are passed via XMM0..XMM7
183 res = X86_64ManagedRegister::FromXmmRegister(
184 static_cast<FloatRegister>(XMM0 + itr_float_and_doubles_));
185 }
186 return res;
187 }
188
CurrentParamStackOffset()189 FrameOffset X86_64JniCallingConvention::CurrentParamStackOffset() {
190 size_t offset = itr_args_
191 - std::min(8U, itr_float_and_doubles_) // Float arguments passed through Xmm0..Xmm7
192 - std::min(6U, itr_args_ - itr_float_and_doubles_); // Integer arguments passed through GPR
193 return FrameOffset(displacement_.Int32Value() - OutArgSize() + (offset * kFramePointerSize));
194 }
195
NumberOfOutgoingStackArgs()196 size_t X86_64JniCallingConvention::NumberOfOutgoingStackArgs() {
197 size_t static_args = IsStatic() ? 1 : 0; // count jclass
198 // regular argument parameters and this
199 size_t param_args = NumArgs() + NumLongOrDoubleArgs();
200 // count JNIEnv* and return pc (pushed after Method*)
201 size_t total_args = static_args + param_args + 2;
202
203 // Float arguments passed through Xmm0..Xmm7
204 // Other (integer) arguments passed through GPR (RDI, RSI, RDX, RCX, R8, R9)
205 size_t total_stack_args = total_args
206 - std::min(8U, static_cast<unsigned int>(NumFloatOrDoubleArgs()))
207 - std::min(6U, static_cast<unsigned int>(NumArgs() - NumFloatOrDoubleArgs()));
208
209 return total_stack_args;
210 }
211
212 } // namespace x86_64
213 } // namespace art
214