1 // Copyright 2011 the V8 project authors. All rights reserved. 2 // Redistribution and use in source and binary forms, with or without 3 // modification, are permitted provided that the following conditions are 4 // met: 5 // 6 // * Redistributions of source code must retain the above copyright 7 // notice, this list of conditions and the following disclaimer. 8 // * Redistributions in binary form must reproduce the above 9 // copyright notice, this list of conditions and the following 10 // disclaimer in the documentation and/or other materials provided 11 // with the distribution. 12 // * Neither the name of Google Inc. nor the names of its 13 // contributors may be used to endorse or promote products derived 14 // from this software without specific prior written permission. 15 // 16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 28 29 30 #ifndef V8_MIPS_FRAMES_MIPS_H_ 31 #define V8_MIPS_FRAMES_MIPS_H_ 32 33 34 namespace v8 { 35 namespace internal { 36 37 // Register lists. 38 // Note that the bit values must match those used in actual instruction 39 // encoding. 40 static const int kNumRegs = 32; 41 42 static const RegList kJSCallerSaved = 43 1 << 2 | // v0 44 1 << 4 | // a0 45 1 << 5 | // a1 46 1 << 6 | // a2 47 1 << 7; // a3 48 49 static const int kNumJSCallerSaved = 5; 50 51 52 // Return the code of the n-th caller-saved register available to JavaScript 53 // e.g. JSCallerSavedReg(0) returns a0.code() == 4. 54 int JSCallerSavedCode(int n); 55 56 57 // Callee-saved registers preserved when switching from C to JavaScript. 58 static const RegList kCalleeSaved = 59 // Saved temporaries. 60 1 << 16 | 1 << 17 | 1 << 18 | 1 << 19 | 61 1 << 20 | 1 << 21 | 1 << 22 | 1 << 23 | 62 // gp, sp, fp 63 1 << 28 | 1 << 29 | 1 << 30; 64 65 static const int kNumCalleeSaved = 11; 66 67 68 // Number of registers for which space is reserved in safepoints. Must be a 69 // multiple of 8. 70 // TODO(mips): Only 8 registers may actually be sufficient. Revisit. 71 static const int kNumSafepointRegisters = 16; 72 73 // Define the list of registers actually saved at safepoints. 74 // Note that the number of saved registers may be smaller than the reserved 75 // space, i.e. kNumSafepointSavedRegisters <= kNumSafepointRegisters. 76 static const RegList kSafepointSavedRegisters = kJSCallerSaved | kCalleeSaved; 77 static const int kNumSafepointSavedRegisters = 78 kNumJSCallerSaved + kNumCalleeSaved; 79 80 typedef Object* JSCallerSavedBuffer[kNumJSCallerSaved]; 81 82 83 // ---------------------------------------------------- 84 85 class StackHandlerConstants : public AllStatic { 86 public: 87 static const int kNextOffset = 0 * kPointerSize; 88 static const int kStateOffset = 1 * kPointerSize; 89 static const int kFPOffset = 2 * kPointerSize; 90 static const int kPCOffset = 3 * kPointerSize; 91 92 static const int kSize = kPCOffset + kPointerSize; 93 }; 94 95 96 class EntryFrameConstants : public AllStatic { 97 public: 98 static const int kCallerFPOffset = -3 * kPointerSize; 99 }; 100 101 102 class ExitFrameConstants : public AllStatic { 103 public: 104 static const int kDebugMarkOffset = -1 * kPointerSize; 105 // Must be the same as kDebugMarkOffset. Alias introduced when upgrading. 106 static const int kCodeOffset = -1 * kPointerSize; 107 static const int kSPOffset = -1 * kPointerSize; 108 109 // TODO(mips): Use a patched sp value on the stack instead. 110 // A marker of 0 indicates that double registers are saved. 111 static const int kMarkerOffset = -2 * kPointerSize; 112 113 // The caller fields are below the frame pointer on the stack. 114 static const int kCallerFPOffset = +0 * kPointerSize; 115 // The calling JS function is between FP and PC. 116 static const int kCallerPCOffset = +1 * kPointerSize; 117 118 // FP-relative displacement of the caller's SP. 119 static const int kCallerSPDisplacement = +3 * kPointerSize; 120 }; 121 122 123 class StandardFrameConstants : public AllStatic { 124 public: 125 static const int kExpressionsOffset = -3 * kPointerSize; 126 static const int kMarkerOffset = -2 * kPointerSize; 127 static const int kContextOffset = -1 * kPointerSize; 128 static const int kCallerFPOffset = 0 * kPointerSize; 129 static const int kCallerPCOffset = +1 * kPointerSize; 130 static const int kCallerSPOffset = +2 * kPointerSize; 131 132 // Size of the MIPS 4 32-bit argument slots. 133 // This is just an alias with a shorter name. Use it from now on. 134 static const int kRArgsSlotsSize = 4 * kPointerSize; 135 static const int kRegularArgsSlotsSize = kRArgsSlotsSize; 136 137 // C/C++ argument slots size. 138 static const int kCArgsSlotsSize = 4 * kPointerSize; 139 // JS argument slots size. 140 static const int kJSArgsSlotsSize = 0 * kPointerSize; 141 // Assembly builtins argument slots size. 142 static const int kBArgsSlotsSize = 0 * kPointerSize; 143 }; 144 145 146 class JavaScriptFrameConstants : public AllStatic { 147 public: 148 // FP-relative. 149 static const int kLocal0Offset = StandardFrameConstants::kExpressionsOffset; 150 static const int kLastParameterOffset = +2 * kPointerSize; 151 static const int kFunctionOffset = StandardFrameConstants::kMarkerOffset; 152 153 // Caller SP-relative. 154 static const int kParam0Offset = -2 * kPointerSize; 155 static const int kReceiverOffset = -1 * kPointerSize; 156 }; 157 158 159 class ArgumentsAdaptorFrameConstants : public AllStatic { 160 public: 161 static const int kLengthOffset = StandardFrameConstants::kExpressionsOffset; 162 }; 163 164 165 class InternalFrameConstants : public AllStatic { 166 public: 167 static const int kCodeOffset = StandardFrameConstants::kExpressionsOffset; 168 }; 169 170 171 inline Object* JavaScriptFrame::function_slot_object() const { 172 const int offset = JavaScriptFrameConstants::kFunctionOffset; 173 return Memory::Object_at(fp() + offset); 174 } 175 176 177 } } // namespace v8::internal 178 179 #endif 180
