1 // Copyright 2010 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 << 4 | // a0 44 1 << 5 | // a1 45 1 << 6 | // a2 46 1 << 7; // a3 47 48 static const int kNumJSCallerSaved = 4; 49 50 51 // Return the code of the n-th caller-saved register available to JavaScript 52 // e.g. JSCallerSavedReg(0) returns r0.code() == 0. 53 int JSCallerSavedCode(int n); 54 55 56 // Callee-saved registers preserved when switching from C to JavaScript. 57 static const RegList kCalleeSaved = 58 // Saved temporaries. 59 1 << 16 | 1 << 17 | 1 << 18 | 1 << 19 | 60 1 << 20 | 1 << 21 | 1 << 22 | 1 << 23 | 61 // gp, sp, fp 62 1 << 28 | 1 << 29 | 1 << 30; 63 64 static const int kNumCalleeSaved = 11; 65 66 67 typedef Object* JSCallerSavedBuffer[kNumJSCallerSaved]; 68 69 70 // ---------------------------------------------------- 71 72 class StackHandlerConstants : public AllStatic { 73 public: 74 static const int kNextOffset = 0 * kPointerSize; 75 static const int kStateOffset = 1 * kPointerSize; 76 static const int kFPOffset = 2 * kPointerSize; 77 static const int kPCOffset = 3 * kPointerSize; 78 79 static const int kSize = kPCOffset + kPointerSize; 80 }; 81 82 83 class EntryFrameConstants : public AllStatic { 84 public: 85 static const int kCallerFPOffset = -3 * kPointerSize; 86 }; 87 88 89 class ExitFrameConstants : public AllStatic { 90 public: 91 // Exit frames have a debug marker on the stack. 92 static const int kSPDisplacement = -1 * kPointerSize; 93 94 // The debug marker is just above the frame pointer. 95 static const int kDebugMarkOffset = -1 * kPointerSize; 96 // Must be the same as kDebugMarkOffset. Alias introduced when upgrading. 97 static const int kCodeOffset = -1 * kPointerSize; 98 99 static const int kSavedRegistersOffset = 0 * kPointerSize; 100 101 // The caller fields are below the frame pointer on the stack. 102 static const int kCallerFPOffset = +0 * kPointerSize; 103 // The calling JS function is between FP and PC. 104 static const int kCallerPCOffset = +1 * kPointerSize; 105 106 // FP-relative displacement of the caller's SP. 107 static const int kCallerSPDisplacement = +4 * kPointerSize; 108 }; 109 110 111 class StandardFrameConstants : public AllStatic { 112 public: 113 static const int kExpressionsOffset = -3 * kPointerSize; 114 static const int kMarkerOffset = -2 * kPointerSize; 115 static const int kContextOffset = -1 * kPointerSize; 116 static const int kCallerFPOffset = 0 * kPointerSize; 117 static const int kCallerPCOffset = +1 * kPointerSize; 118 static const int kCallerSPOffset = +2 * kPointerSize; 119 120 // Size of the MIPS 4 32-bit argument slots. 121 // This is just an alias with a shorter name. Use it from now on. 122 static const int kRArgsSlotsSize = 4 * kPointerSize; 123 static const int kRegularArgsSlotsSize = kRArgsSlotsSize; 124 125 // C/C++ argument slots size. 126 static const int kCArgsSlotsSize = 4 * kPointerSize; 127 // JS argument slots size. 128 static const int kJSArgsSlotsSize = 0 * kPointerSize; 129 }; 130 131 132 class JavaScriptFrameConstants : public AllStatic { 133 public: 134 // FP-relative. 135 static const int kLocal0Offset = StandardFrameConstants::kExpressionsOffset; 136 static const int kSavedRegistersOffset = +2 * kPointerSize; 137 static const int kFunctionOffset = StandardFrameConstants::kMarkerOffset; 138 139 // Caller SP-relative. 140 static const int kParam0Offset = -2 * kPointerSize; 141 static const int kReceiverOffset = -1 * kPointerSize; 142 }; 143 144 145 class ArgumentsAdaptorFrameConstants : public AllStatic { 146 public: 147 static const int kLengthOffset = StandardFrameConstants::kExpressionsOffset; 148 }; 149 150 151 class InternalFrameConstants : public AllStatic { 152 public: 153 static const int kCodeOffset = StandardFrameConstants::kExpressionsOffset; 154 }; 155 156 157 inline Object* JavaScriptFrame::function_slot_object() const { 158 const int offset = JavaScriptFrameConstants::kFunctionOffset; 159 return Memory::Object_at(fp() + offset); 160 } 161 162 } } // namespace v8::internal 163 164 #endif 165
