1 // Copyright 2015 the V8 project authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #include "src/assembler.h"
6 #include "src/macro-assembler.h"
7
8 #include "src/compiler/linkage.h"
9
10 #include "src/zone.h"
11
12 namespace v8 {
13 namespace internal {
14 namespace compiler {
15
16 namespace {
regloc(Register reg)17 LinkageLocation regloc(Register reg) {
18 return LinkageLocation::ForRegister(reg.code());
19 }
20
21
22 // Platform-specific configuration for C calling convention.
23 #if V8_TARGET_ARCH_IA32
24 // ===========================================================================
25 // == ia32 ===================================================================
26 // ===========================================================================
27 #define CALLEE_SAVE_REGISTERS esi.bit() | edi.bit() | ebx.bit()
28
29 #elif V8_TARGET_ARCH_X64
30 // ===========================================================================
31 // == x64 ====================================================================
32 // ===========================================================================
33
34 #ifdef _WIN64
35 // == x64 windows ============================================================
36 #define STACK_SHADOW_WORDS 4
37 #define PARAM_REGISTERS rcx, rdx, r8, r9
38 #define CALLEE_SAVE_REGISTERS \
39 rbx.bit() | rdi.bit() | rsi.bit() | r12.bit() | r13.bit() | r14.bit() | \
40 r15.bit()
41 #define CALLEE_SAVE_FP_REGISTERS \
42 (1 << xmm6.code()) | (1 << xmm7.code()) | (1 << xmm8.code()) | \
43 (1 << xmm9.code()) | (1 << xmm10.code()) | (1 << xmm11.code()) | \
44 (1 << xmm12.code()) | (1 << xmm13.code()) | (1 << xmm14.code()) | \
45 (1 << xmm15.code())
46 #else
47 // == x64 other ==============================================================
48 #define PARAM_REGISTERS rdi, rsi, rdx, rcx, r8, r9
49 #define CALLEE_SAVE_REGISTERS \
50 rbx.bit() | r12.bit() | r13.bit() | r14.bit() | r15.bit()
51 #endif
52
53 #elif V8_TARGET_ARCH_X87
54 // ===========================================================================
55 // == x87 ====================================================================
56 // ===========================================================================
57 #define CALLEE_SAVE_REGISTERS esi.bit() | edi.bit() | ebx.bit()
58
59 #elif V8_TARGET_ARCH_ARM
60 // ===========================================================================
61 // == arm ====================================================================
62 // ===========================================================================
63 #define PARAM_REGISTERS r0, r1, r2, r3
64 #define CALLEE_SAVE_REGISTERS \
65 r4.bit() | r5.bit() | r6.bit() | r7.bit() | r8.bit() | r9.bit() | r10.bit()
66 #define CALLEE_SAVE_FP_REGISTERS \
67 (1 << d8.code()) | (1 << d9.code()) | (1 << d10.code()) | \
68 (1 << d11.code()) | (1 << d12.code()) | (1 << d13.code()) | \
69 (1 << d14.code()) | (1 << d15.code())
70
71
72 #elif V8_TARGET_ARCH_ARM64
73 // ===========================================================================
74 // == arm64 ====================================================================
75 // ===========================================================================
76 #define PARAM_REGISTERS x0, x1, x2, x3, x4, x5, x6, x7
77 #define CALLEE_SAVE_REGISTERS \
78 (1 << x19.code()) | (1 << x20.code()) | (1 << x21.code()) | \
79 (1 << x22.code()) | (1 << x23.code()) | (1 << x24.code()) | \
80 (1 << x25.code()) | (1 << x26.code()) | (1 << x27.code()) | \
81 (1 << x28.code()) | (1 << x29.code()) | (1 << x30.code())
82
83
84 #define CALLEE_SAVE_FP_REGISTERS \
85 (1 << d8.code()) | (1 << d9.code()) | (1 << d10.code()) | \
86 (1 << d11.code()) | (1 << d12.code()) | (1 << d13.code()) | \
87 (1 << d14.code()) | (1 << d15.code())
88
89 #elif V8_TARGET_ARCH_MIPS
90 // ===========================================================================
91 // == mips ===================================================================
92 // ===========================================================================
93 #define PARAM_REGISTERS a0, a1, a2, a3
94 #define CALLEE_SAVE_REGISTERS \
95 s0.bit() | s1.bit() | s2.bit() | s3.bit() | s4.bit() | s5.bit() | s6.bit() | \
96 s7.bit()
97 #define CALLEE_SAVE_FP_REGISTERS \
98 f20.bit() | f22.bit() | f24.bit() | f26.bit() | f28.bit() | f30.bit()
99
100 #elif V8_TARGET_ARCH_MIPS64
101 // ===========================================================================
102 // == mips64 =================================================================
103 // ===========================================================================
104 #define PARAM_REGISTERS a0, a1, a2, a3, a4, a5, a6, a7
105 #define CALLEE_SAVE_REGISTERS \
106 s0.bit() | s1.bit() | s2.bit() | s3.bit() | s4.bit() | s5.bit() | s6.bit() | \
107 s7.bit()
108 #define CALLEE_SAVE_FP_REGISTERS \
109 f20.bit() | f22.bit() | f24.bit() | f26.bit() | f28.bit() | f30.bit()
110
111 #elif V8_TARGET_ARCH_PPC || V8_TARGET_ARCH_PPC64
112 // ===========================================================================
113 // == ppc & ppc64 ============================================================
114 // ===========================================================================
115 #define PARAM_REGISTERS r3, r4, r5, r6, r7, r8, r9, r10
116 #define CALLEE_SAVE_REGISTERS \
117 r14.bit() | r15.bit() | r16.bit() | r17.bit() | r18.bit() | r19.bit() | \
118 r20.bit() | r21.bit() | r22.bit() | r23.bit() | r24.bit() | r25.bit() | \
119 r26.bit() | r27.bit() | r28.bit() | r29.bit() | r30.bit()
120 #define CALLEE_SAVE_FP_REGISTERS \
121 d14.bit() | d15.bit() | d16.bit() | d17.bit() | d18.bit() | d19.bit() | \
122 d20.bit() | d21.bit() | d22.bit() | d23.bit() | d24.bit() | d25.bit() | \
123 d26.bit() | d27.bit() | d28.bit() | d29.bit() | d30.bit() | d31.bit()
124
125 #else
126 // ===========================================================================
127 // == unknown ================================================================
128 // ===========================================================================
129 #define UNSUPPORTED_C_LINKAGE 1
130 #endif
131 } // namespace
132
133
134 // General code uses the above configuration data.
GetSimplifiedCDescriptor(Zone * zone,const MachineSignature * msig)135 CallDescriptor* Linkage::GetSimplifiedCDescriptor(
136 Zone* zone, const MachineSignature* msig) {
137 LocationSignature::Builder locations(zone, msig->return_count(),
138 msig->parameter_count());
139 #if 0 // TODO(titzer): instruction selector tests break here.
140 // Check the types of the signature.
141 // Currently no floating point parameters or returns are allowed because
142 // on x87 and ia32, the FP top of stack is involved.
143
144 for (size_t i = 0; i < msig->return_count(); i++) {
145 MachineType type = RepresentationOf(msig->GetReturn(i));
146 CHECK(type != kRepFloat32 && type != kRepFloat64);
147 }
148 for (size_t i = 0; i < msig->parameter_count(); i++) {
149 MachineType type = RepresentationOf(msig->GetParam(i));
150 CHECK(type != kRepFloat32 && type != kRepFloat64);
151 }
152 #endif
153
154 #ifdef UNSUPPORTED_C_LINKAGE
155 // This method should not be called on unknown architectures.
156 V8_Fatal(__FILE__, __LINE__,
157 "requested C call descriptor on unsupported architecture");
158 return nullptr;
159 #endif
160
161 // Add return location(s).
162 CHECK(locations.return_count_ <= 2);
163
164 if (locations.return_count_ > 0) {
165 locations.AddReturn(regloc(kReturnRegister0));
166 }
167 if (locations.return_count_ > 1) {
168 locations.AddReturn(regloc(kReturnRegister1));
169 }
170
171 const int parameter_count = static_cast<int>(msig->parameter_count());
172
173 #ifdef PARAM_REGISTERS
174 static const Register kParamRegisters[] = {PARAM_REGISTERS};
175 static const int kParamRegisterCount =
176 static_cast<int>(arraysize(kParamRegisters));
177 #else
178 static const Register* kParamRegisters = nullptr;
179 static const int kParamRegisterCount = 0;
180 #endif
181
182 #ifdef STACK_SHADOW_WORDS
183 int stack_offset = STACK_SHADOW_WORDS;
184 #else
185 int stack_offset = 0;
186 #endif
187 // Add register and/or stack parameter(s).
188 for (int i = 0; i < parameter_count; i++) {
189 if (i < kParamRegisterCount) {
190 locations.AddParam(regloc(kParamRegisters[i]));
191 } else {
192 locations.AddParam(
193 LinkageLocation::ForCallerFrameSlot(-1 - stack_offset));
194 stack_offset++;
195 }
196 }
197
198 #ifdef CALLEE_SAVE_REGISTERS
199 const RegList kCalleeSaveRegisters = CALLEE_SAVE_REGISTERS;
200 #else
201 const RegList kCalleeSaveRegisters = 0;
202 #endif
203
204 #ifdef CALLEE_SAVE_FP_REGISTERS
205 const RegList kCalleeSaveFPRegisters = CALLEE_SAVE_FP_REGISTERS;
206 #else
207 const RegList kCalleeSaveFPRegisters = 0;
208 #endif
209
210 // The target for C calls is always an address (i.e. machine pointer).
211 MachineType target_type = MachineType::Pointer();
212 LinkageLocation target_loc = LinkageLocation::ForAnyRegister();
213 return new (zone) CallDescriptor( // --
214 CallDescriptor::kCallAddress, // kind
215 target_type, // target MachineType
216 target_loc, // target location
217 msig, // machine_sig
218 locations.Build(), // location_sig
219 0, // stack_parameter_count
220 Operator::kNoProperties, // properties
221 kCalleeSaveRegisters, // callee-saved registers
222 kCalleeSaveFPRegisters, // callee-saved fp regs
223 CallDescriptor::kNoFlags, // flags
224 "c-call");
225 }
226
227 } // namespace compiler
228 } // namespace internal
229 } // namespace v8
230