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/bit_utils.h"
20 #include "base/logging.h"
21 #include "handle_scope-inl.h"
22 #include "utils/x86_64/managed_register_x86_64.h"
23
24 namespace art {
25 namespace x86_64 {
26
27 // Calling convention
28
InterproceduralScratchRegister()29 ManagedRegister X86_64ManagedRuntimeCallingConvention::InterproceduralScratchRegister() {
30 return X86_64ManagedRegister::FromCpuRegister(RAX);
31 }
32
InterproceduralScratchRegister()33 ManagedRegister X86_64JniCallingConvention::InterproceduralScratchRegister() {
34 return X86_64ManagedRegister::FromCpuRegister(RAX);
35 }
36
ReturnScratchRegister() const37 ManagedRegister X86_64JniCallingConvention::ReturnScratchRegister() const {
38 return ManagedRegister::NoRegister(); // No free regs, so assembler uses push/pop
39 }
40
ReturnRegisterForShorty(const char * shorty,bool jni)41 static ManagedRegister ReturnRegisterForShorty(const char* shorty, bool jni) {
42 UNUSED(jni);
43 if (shorty[0] == 'F' || shorty[0] == 'D') {
44 return X86_64ManagedRegister::FromXmmRegister(XMM0);
45 } else if (shorty[0] == 'J') {
46 return X86_64ManagedRegister::FromCpuRegister(RAX);
47 } else if (shorty[0] == 'V') {
48 return ManagedRegister::NoRegister();
49 } else {
50 return X86_64ManagedRegister::FromCpuRegister(RAX);
51 }
52 }
53
ReturnRegister()54 ManagedRegister X86_64ManagedRuntimeCallingConvention::ReturnRegister() {
55 return ReturnRegisterForShorty(GetShorty(), false);
56 }
57
ReturnRegister()58 ManagedRegister X86_64JniCallingConvention::ReturnRegister() {
59 return ReturnRegisterForShorty(GetShorty(), true);
60 }
61
IntReturnRegister()62 ManagedRegister X86_64JniCallingConvention::IntReturnRegister() {
63 return X86_64ManagedRegister::FromCpuRegister(RAX);
64 }
65
66 // Managed runtime calling convention
67
MethodRegister()68 ManagedRegister X86_64ManagedRuntimeCallingConvention::MethodRegister() {
69 return X86_64ManagedRegister::FromCpuRegister(RDI);
70 }
71
IsCurrentParamInRegister()72 bool X86_64ManagedRuntimeCallingConvention::IsCurrentParamInRegister() {
73 return !IsCurrentParamOnStack();
74 }
75
IsCurrentParamOnStack()76 bool X86_64ManagedRuntimeCallingConvention::IsCurrentParamOnStack() {
77 // We assume all parameters are on stack, args coming via registers are spilled as entry_spills
78 return true;
79 }
80
CurrentParamRegister()81 ManagedRegister X86_64ManagedRuntimeCallingConvention::CurrentParamRegister() {
82 ManagedRegister res = ManagedRegister::NoRegister();
83 if (!IsCurrentParamAFloatOrDouble()) {
84 switch (itr_args_ - itr_float_and_doubles_) {
85 case 0: res = X86_64ManagedRegister::FromCpuRegister(RSI); break;
86 case 1: res = X86_64ManagedRegister::FromCpuRegister(RDX); break;
87 case 2: res = X86_64ManagedRegister::FromCpuRegister(RCX); break;
88 case 3: res = X86_64ManagedRegister::FromCpuRegister(R8); break;
89 case 4: res = X86_64ManagedRegister::FromCpuRegister(R9); break;
90 }
91 } else if (itr_float_and_doubles_ < 8) {
92 // First eight float parameters are passed via XMM0..XMM7
93 res = X86_64ManagedRegister::FromXmmRegister(
94 static_cast<FloatRegister>(XMM0 + itr_float_and_doubles_));
95 }
96 return res;
97 }
98
CurrentParamStackOffset()99 FrameOffset X86_64ManagedRuntimeCallingConvention::CurrentParamStackOffset() {
100 return FrameOffset(displacement_.Int32Value() + // displacement
101 kX86_64PointerSize + // Method ref
102 itr_slots_ * sizeof(uint32_t)); // offset into in args
103 }
104
EntrySpills()105 const ManagedRegisterEntrySpills& X86_64ManagedRuntimeCallingConvention::EntrySpills() {
106 // We spill the argument registers on X86 to free them up for scratch use, we then assume
107 // all arguments are on the stack.
108 if (entry_spills_.size() == 0) {
109 ResetIterator(FrameOffset(0));
110 while (HasNext()) {
111 ManagedRegister in_reg = CurrentParamRegister();
112 if (!in_reg.IsNoRegister()) {
113 int32_t size = IsParamALongOrDouble(itr_args_)? 8 : 4;
114 int32_t spill_offset = CurrentParamStackOffset().Uint32Value();
115 ManagedRegisterSpill spill(in_reg, size, spill_offset);
116 entry_spills_.push_back(spill);
117 }
118 Next();
119 }
120 }
121 return entry_spills_;
122 }
123
124 // JNI calling convention
125
X86_64JniCallingConvention(bool is_static,bool is_synchronized,const char * shorty)126 X86_64JniCallingConvention::X86_64JniCallingConvention(bool is_static, bool is_synchronized,
127 const char* shorty)
128 : JniCallingConvention(is_static, is_synchronized, shorty, kFramePointerSize) {
129 callee_save_regs_.push_back(X86_64ManagedRegister::FromCpuRegister(RBX));
130 callee_save_regs_.push_back(X86_64ManagedRegister::FromCpuRegister(RBP));
131 callee_save_regs_.push_back(X86_64ManagedRegister::FromCpuRegister(R12));
132 callee_save_regs_.push_back(X86_64ManagedRegister::FromCpuRegister(R13));
133 callee_save_regs_.push_back(X86_64ManagedRegister::FromCpuRegister(R14));
134 callee_save_regs_.push_back(X86_64ManagedRegister::FromCpuRegister(R15));
135 callee_save_regs_.push_back(X86_64ManagedRegister::FromXmmRegister(XMM12));
136 callee_save_regs_.push_back(X86_64ManagedRegister::FromXmmRegister(XMM13));
137 callee_save_regs_.push_back(X86_64ManagedRegister::FromXmmRegister(XMM14));
138 callee_save_regs_.push_back(X86_64ManagedRegister::FromXmmRegister(XMM15));
139 }
140
CoreSpillMask() const141 uint32_t X86_64JniCallingConvention::CoreSpillMask() const {
142 return 1 << RBX | 1 << RBP | 1 << R12 | 1 << R13 | 1 << R14 | 1 << R15 |
143 1 << kNumberOfCpuRegisters;
144 }
145
FpSpillMask() const146 uint32_t X86_64JniCallingConvention::FpSpillMask() const {
147 return 1 << XMM12 | 1 << XMM13 | 1 << XMM14 | 1 << XMM15;
148 }
149
FrameSize()150 size_t X86_64JniCallingConvention::FrameSize() {
151 // Method*, return address and callee save area size, local reference segment state
152 size_t frame_data_size = kX86_64PointerSize +
153 (2 + CalleeSaveRegisters().size()) * kFramePointerSize;
154 // References plus link_ (pointer) and number_of_references_ (uint32_t) for HandleScope header
155 size_t handle_scope_size = HandleScope::SizeOf(kFramePointerSize, ReferenceCount());
156 // Plus return value spill area size
157 return RoundUp(frame_data_size + handle_scope_size + SizeOfReturnValue(), kStackAlignment);
158 }
159
OutArgSize()160 size_t X86_64JniCallingConvention::OutArgSize() {
161 return RoundUp(NumberOfOutgoingStackArgs() * kFramePointerSize, kStackAlignment);
162 }
163
IsCurrentParamInRegister()164 bool X86_64JniCallingConvention::IsCurrentParamInRegister() {
165 return !IsCurrentParamOnStack();
166 }
167
IsCurrentParamOnStack()168 bool X86_64JniCallingConvention::IsCurrentParamOnStack() {
169 return CurrentParamRegister().IsNoRegister();
170 }
171
CurrentParamRegister()172 ManagedRegister X86_64JniCallingConvention::CurrentParamRegister() {
173 ManagedRegister res = ManagedRegister::NoRegister();
174 if (!IsCurrentParamAFloatOrDouble()) {
175 switch (itr_args_ - itr_float_and_doubles_) {
176 case 0: res = X86_64ManagedRegister::FromCpuRegister(RDI); break;
177 case 1: res = X86_64ManagedRegister::FromCpuRegister(RSI); break;
178 case 2: res = X86_64ManagedRegister::FromCpuRegister(RDX); break;
179 case 3: res = X86_64ManagedRegister::FromCpuRegister(RCX); break;
180 case 4: res = X86_64ManagedRegister::FromCpuRegister(R8); break;
181 case 5: res = X86_64ManagedRegister::FromCpuRegister(R9); break;
182 }
183 } else if (itr_float_and_doubles_ < 8) {
184 // First eight float parameters are passed via XMM0..XMM7
185 res = X86_64ManagedRegister::FromXmmRegister(
186 static_cast<FloatRegister>(XMM0 + itr_float_and_doubles_));
187 }
188 return res;
189 }
190
CurrentParamStackOffset()191 FrameOffset X86_64JniCallingConvention::CurrentParamStackOffset() {
192 size_t offset = itr_args_
193 - std::min(8U, itr_float_and_doubles_) // Float arguments passed through Xmm0..Xmm7
194 - std::min(6U, itr_args_ - itr_float_and_doubles_); // Integer arguments passed through GPR
195 return FrameOffset(displacement_.Int32Value() - OutArgSize() + (offset * kFramePointerSize));
196 }
197
NumberOfOutgoingStackArgs()198 size_t X86_64JniCallingConvention::NumberOfOutgoingStackArgs() {
199 size_t static_args = IsStatic() ? 1 : 0; // count jclass
200 // regular argument parameters and this
201 size_t param_args = NumArgs() + NumLongOrDoubleArgs();
202 // count JNIEnv* and return pc (pushed after Method*)
203 size_t total_args = static_args + param_args + 2;
204
205 // Float arguments passed through Xmm0..Xmm7
206 // Other (integer) arguments passed through GPR (RDI, RSI, RDX, RCX, R8, R9)
207 size_t total_stack_args = total_args
208 - std::min(8U, static_cast<unsigned int>(NumFloatOrDoubleArgs()))
209 - std::min(6U, static_cast<unsigned int>(NumArgs() - NumFloatOrDoubleArgs()));
210
211 return total_stack_args;
212 }
213
214 } // namespace x86_64
215 } // namespace art
216