Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 1 | // Copyright 2014 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 | #ifndef V8_S390_FRAMES_S390_H_ |
| 6 | #define V8_S390_FRAMES_S390_H_ |
| 7 | |
| 8 | namespace v8 { |
| 9 | namespace internal { |
| 10 | |
| 11 | // Register list in load/store instructions |
| 12 | // Note that the bit values must match those used in actual instruction encoding |
| 13 | const int kNumRegs = 16; |
| 14 | |
| 15 | // Caller-saved/arguments registers |
| 16 | const RegList kJSCallerSaved = 1 << 1 | 1 << 2 | // r2 a1 |
| 17 | 1 << 3 | // r3 a2 |
| 18 | 1 << 4 | // r4 a3 |
| 19 | 1 << 5; // r5 a4 |
| 20 | |
| 21 | const int kNumJSCallerSaved = 5; |
| 22 | |
| 23 | // Return the code of the n-th caller-saved register available to JavaScript |
| 24 | // e.g. JSCallerSavedReg(0) returns r0.code() == 0 |
| 25 | int JSCallerSavedCode(int n); |
| 26 | |
| 27 | // Callee-saved registers preserved when switching from C to JavaScript |
| 28 | const RegList kCalleeSaved = |
| 29 | 1 << 6 | // r6 (argument passing in CEntryStub) |
| 30 | // (HandleScope logic in MacroAssembler) |
| 31 | 1 << 7 | // r7 (argument passing in CEntryStub) |
| 32 | // (HandleScope logic in MacroAssembler) |
| 33 | 1 << 8 | // r8 (argument passing in CEntryStub) |
| 34 | // (HandleScope logic in MacroAssembler) |
| 35 | 1 << 9 | // r9 (HandleScope logic in MacroAssembler) |
| 36 | 1 << 10 | // r10 (Roots register in Javascript) |
| 37 | 1 << 11 | // r11 (fp in Javascript) |
| 38 | 1 << 12 | // r12 (ip in Javascript) |
| 39 | 1 << 13; // r13 (cp in Javascript) |
| 40 | // 1 << 15; // r15 (sp in Javascript) |
| 41 | |
| 42 | const int kNumCalleeSaved = 8; |
| 43 | |
| 44 | #ifdef V8_TARGET_ARCH_S390X |
| 45 | |
| 46 | const RegList kCallerSavedDoubles = 1 << 0 | // d0 |
| 47 | 1 << 1 | // d1 |
| 48 | 1 << 2 | // d2 |
| 49 | 1 << 3 | // d3 |
| 50 | 1 << 4 | // d4 |
| 51 | 1 << 5 | // d5 |
| 52 | 1 << 6 | // d6 |
| 53 | 1 << 7; // d7 |
| 54 | |
| 55 | const int kNumCallerSavedDoubles = 8; |
| 56 | |
| 57 | const RegList kCalleeSavedDoubles = 1 << 8 | // d8 |
| 58 | 1 << 9 | // d9 |
| 59 | 1 << 10 | // d10 |
| 60 | 1 << 11 | // d11 |
| 61 | 1 << 12 | // d12 |
| 62 | 1 << 13 | // d12 |
| 63 | 1 << 14 | // d12 |
| 64 | 1 << 15; // d13 |
| 65 | |
| 66 | const int kNumCalleeSavedDoubles = 8; |
| 67 | |
| 68 | #else |
| 69 | |
| 70 | const RegList kCallerSavedDoubles = 1 << 14 | // d14 |
| 71 | 1 << 15 | // d15 |
| 72 | 1 << 0 | // d0 |
| 73 | 1 << 1 | // d1 |
| 74 | 1 << 2 | // d2 |
| 75 | 1 << 3 | // d3 |
| 76 | 1 << 5 | // d5 |
| 77 | 1 << 7 | // d7 |
| 78 | 1 << 8 | // d8 |
| 79 | 1 << 9 | // d9 |
| 80 | 1 << 10 | // d10 |
| 81 | 1 << 11 | // d10 |
| 82 | 1 << 12 | // d10 |
| 83 | 1 << 13; // d11 |
| 84 | |
| 85 | const int kNumCallerSavedDoubles = 14; |
| 86 | |
| 87 | const RegList kCalleeSavedDoubles = 1 << 4 | // d4 |
| 88 | 1 << 6; // d6 |
| 89 | |
| 90 | const int kNumCalleeSavedDoubles = 2; |
| 91 | |
| 92 | #endif |
| 93 | |
| 94 | // Number of registers for which space is reserved in safepoints. Must be a |
| 95 | // multiple of 8. |
| 96 | // TODO(regis): Only 8 registers may actually be sufficient. Revisit. |
| 97 | const int kNumSafepointRegisters = 16; |
| 98 | |
| 99 | // Define the list of registers actually saved at safepoints. |
| 100 | // Note that the number of saved registers may be smaller than the reserved |
| 101 | // space, i.e. kNumSafepointSavedRegisters <= kNumSafepointRegisters. |
| 102 | // const RegList kSafepointSavedRegisters = kJSCallerSaved | kCalleeSaved; |
| 103 | // const int kNumSafepointSavedRegisters = kNumJSCallerSaved + kNumCalleeSaved; |
| 104 | |
| 105 | // The following constants describe the stack frame linkage area as |
| 106 | // defined by the ABI. |
| 107 | |
| 108 | #if V8_TARGET_ARCH_S390X |
| 109 | // [0] Back Chain |
| 110 | // [1] Reserved for compiler use |
| 111 | // [2] GPR 2 |
| 112 | // [3] GPR 3 |
| 113 | // ... |
| 114 | // [15] GPR 15 |
| 115 | // [16] FPR 0 |
| 116 | // [17] FPR 2 |
| 117 | // [18] FPR 4 |
| 118 | // [19] FPR 6 |
| 119 | const int kNumRequiredStackFrameSlots = 20; |
| 120 | const int kStackFrameRASlot = 14; |
| 121 | const int kStackFrameSPSlot = 15; |
| 122 | const int kStackFrameExtraParamSlot = 20; |
| 123 | #else |
| 124 | // [0] Back Chain |
| 125 | // [1] Reserved for compiler use |
| 126 | // [2] GPR 2 |
| 127 | // [3] GPR 3 |
| 128 | // ... |
| 129 | // [15] GPR 15 |
| 130 | // [16..17] FPR 0 |
| 131 | // [18..19] FPR 2 |
| 132 | // [20..21] FPR 4 |
| 133 | // [22..23] FPR 6 |
| 134 | const int kNumRequiredStackFrameSlots = 24; |
| 135 | const int kStackFrameRASlot = 14; |
| 136 | const int kStackFrameSPSlot = 15; |
| 137 | const int kStackFrameExtraParamSlot = 24; |
| 138 | #endif |
| 139 | |
| 140 | // zLinux ABI requires caller frames to include sufficient space for |
| 141 | // callee preserved register save area. |
| 142 | #if V8_TARGET_ARCH_S390X |
| 143 | const int kCalleeRegisterSaveAreaSize = 160; |
| 144 | #elif V8_TARGET_ARCH_S390 |
| 145 | const int kCalleeRegisterSaveAreaSize = 96; |
| 146 | #else |
| 147 | const int kCalleeRegisterSaveAreaSize = 0; |
| 148 | #endif |
| 149 | |
| 150 | // ---------------------------------------------------- |
| 151 | |
| 152 | class EntryFrameConstants : public AllStatic { |
| 153 | public: |
| 154 | static const int kCallerFPOffset = |
| 155 | -(StandardFrameConstants::kFixedFrameSizeFromFp + kPointerSize); |
| 156 | }; |
| 157 | |
| 158 | class ExitFrameConstants : public TypedFrameConstants { |
| 159 | public: |
| 160 | static const int kSPOffset = TYPED_FRAME_PUSHED_VALUE_OFFSET(0); |
| 161 | static const int kCodeOffset = TYPED_FRAME_PUSHED_VALUE_OFFSET(1); |
| 162 | DEFINE_TYPED_FRAME_SIZES(2); |
| 163 | |
| 164 | // The caller fields are below the frame pointer on the stack. |
| 165 | static const int kCallerFPOffset = 0 * kPointerSize; |
| 166 | // The calling JS function is below FP. |
| 167 | static const int kCallerPCOffset = 1 * kPointerSize; |
| 168 | |
| 169 | // FP-relative displacement of the caller's SP. It points just |
| 170 | // below the saved PC. |
| 171 | static const int kCallerSPDisplacement = 2 * kPointerSize; |
| 172 | }; |
| 173 | |
| 174 | class JavaScriptFrameConstants : public AllStatic { |
| 175 | public: |
| 176 | // FP-relative. |
| 177 | static const int kLocal0Offset = StandardFrameConstants::kExpressionsOffset; |
| 178 | static const int kLastParameterOffset = +2 * kPointerSize; |
| 179 | static const int kFunctionOffset = StandardFrameConstants::kFunctionOffset; |
| 180 | |
| 181 | // Caller SP-relative. |
| 182 | static const int kParam0Offset = -2 * kPointerSize; |
| 183 | static const int kReceiverOffset = -1 * kPointerSize; |
| 184 | }; |
| 185 | |
| 186 | } // namespace internal |
| 187 | } // namespace v8 |
| 188 | |
| 189 | #endif // V8_S390_FRAMES_S390_H_ |