1 // Copyright 2011 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 6 7 #ifndef V8_MIPS_FRAMES_MIPS_H_ 8 #define V8_MIPS_FRAMES_MIPS_H_ 9 10 namespace v8 { 11 namespace internal { 12 13 // Register lists. 14 // Note that the bit values must match those used in actual instruction 15 // encoding. 16 const int kNumRegs = 32; 17 18 const RegList kJSCallerSaved = 19 1 << 2 | // v0 20 1 << 3 | // v1 21 1 << 4 | // a0 22 1 << 5 | // a1 23 1 << 6 | // a2 24 1 << 7 | // a3 25 1 << 8 | // t0 26 1 << 9 | // t1 27 1 << 10 | // t2 28 1 << 11 | // t3 29 1 << 12 | // t4 30 1 << 13 | // t5 31 1 << 14 | // t6 32 1 << 15; // t7 33 34 const int kNumJSCallerSaved = 14; 35 36 37 // Return the code of the n-th caller-saved register available to JavaScript 38 // e.g. JSCallerSavedReg(0) returns a0.code() == 4. 39 int JSCallerSavedCode(int n); 40 41 42 // Callee-saved registers preserved when switching from C to JavaScript. 43 const RegList kCalleeSaved = 44 1 << 16 | // s0 45 1 << 17 | // s1 46 1 << 18 | // s2 47 1 << 19 | // s3 48 1 << 20 | // s4 49 1 << 21 | // s5 50 1 << 22 | // s6 (roots in Javascript code) 51 1 << 23 | // s7 (cp in Javascript code) 52 1 << 30; // fp/s8 53 54 const int kNumCalleeSaved = 9; 55 56 const RegList kCalleeSavedFPU = 57 1 << 20 | // f20 58 1 << 22 | // f22 59 1 << 24 | // f24 60 1 << 26 | // f26 61 1 << 28 | // f28 62 1 << 30; // f30 63 64 const int kNumCalleeSavedFPU = 6; 65 66 const RegList kCallerSavedFPU = 67 1 << 0 | // f0 68 1 << 2 | // f2 69 1 << 4 | // f4 70 1 << 6 | // f6 71 1 << 8 | // f8 72 1 << 10 | // f10 73 1 << 12 | // f12 74 1 << 14 | // f14 75 1 << 16 | // f16 76 1 << 18; // f18 77 78 79 // Number of registers for which space is reserved in safepoints. Must be a 80 // multiple of 8. 81 const int kNumSafepointRegisters = 24; 82 83 // Define the list of registers actually saved at safepoints. 84 // Note that the number of saved registers may be smaller than the reserved 85 // space, i.e. kNumSafepointSavedRegisters <= kNumSafepointRegisters. 86 const RegList kSafepointSavedRegisters = kJSCallerSaved | kCalleeSaved; 87 const int kNumSafepointSavedRegisters = 88 kNumJSCallerSaved + kNumCalleeSaved; 89 90 const int kUndefIndex = -1; 91 // Map with indexes on stack that corresponds to codes of saved registers. 92 const int kSafepointRegisterStackIndexMap[kNumRegs] = { 93 kUndefIndex, // zero_reg 94 kUndefIndex, // at 95 0, // v0 96 1, // v1 97 2, // a0 98 3, // a1 99 4, // a2 100 5, // a3 101 6, // t0 102 7, // t1 103 8, // t2 104 9, // t3 105 10, // t4 106 11, // t5 107 12, // t6 108 13, // t7 109 14, // s0 110 15, // s1 111 16, // s2 112 17, // s3 113 18, // s4 114 19, // s5 115 20, // s6 116 21, // s7 117 kUndefIndex, // t8 118 kUndefIndex, // t9 119 kUndefIndex, // k0 120 kUndefIndex, // k1 121 kUndefIndex, // gp 122 kUndefIndex, // sp 123 22, // fp 124 kUndefIndex 125 }; 126 127 128 // ---------------------------------------------------- 129 130 class EntryFrameConstants : public AllStatic { 131 public: 132 static const int kCallerFPOffset = 133 -(StandardFrameConstants::kFixedFrameSizeFromFp + kPointerSize); 134 }; 135 136 class ExitFrameConstants : public TypedFrameConstants { 137 public: 138 static const int kSPOffset = TYPED_FRAME_PUSHED_VALUE_OFFSET(0); 139 static const int kCodeOffset = TYPED_FRAME_PUSHED_VALUE_OFFSET(1); 140 DEFINE_TYPED_FRAME_SIZES(2); 141 142 // The caller fields are below the frame pointer on the stack. 143 static const int kCallerFPOffset = +0 * kPointerSize; 144 // The calling JS function is between FP and PC. 145 static const int kCallerPCOffset = +1 * kPointerSize; 146 147 // MIPS-specific: a pointer to the old sp to avoid unnecessary calculations. 148 static const int kCallerSPOffset = +2 * kPointerSize; 149 150 // FP-relative displacement of the caller's SP. 151 static const int kCallerSPDisplacement = +2 * kPointerSize; 152 153 static const int kConstantPoolOffset = 0; // Not used. 154 }; 155 156 157 class JavaScriptFrameConstants : public AllStatic { 158 public: 159 // FP-relative. 160 static const int kLocal0Offset = StandardFrameConstants::kExpressionsOffset; 161 static const int kLastParameterOffset = +2 * kPointerSize; 162 static const int kFunctionOffset = StandardFrameConstants::kFunctionOffset; 163 164 // Caller SP-relative. 165 static const int kParam0Offset = -2 * kPointerSize; 166 static const int kReceiverOffset = -1 * kPointerSize; 167 }; 168 169 170 } // namespace internal 171 } // namespace v8 172 173 #endif 174