1 // Copyright 2006-2008 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 #ifndef V8_ARM_FRAMES_ARM_H_ 29 #define V8_ARM_FRAMES_ARM_H_ 30 31 namespace v8 { 32 namespace internal { 33 34 35 // The ARM ABI does not specify the usage of register r9, which may be reserved 36 // as the static base or thread register on some platforms, in which case we 37 // leave it alone. Adjust the value of kR9Available accordingly: 38 static const int kR9Available = 1; // 1 if available to us, 0 if reserved 39 40 41 // Register list in load/store instructions 42 // Note that the bit values must match those used in actual instruction encoding 43 static const int kNumRegs = 16; 44 45 46 // Caller-saved/arguments registers 47 static const RegList kJSCallerSaved = 48 1 << 0 | // r0 a1 49 1 << 1 | // r1 a2 50 1 << 2 | // r2 a3 51 1 << 3; // r3 a4 52 53 static const int kNumJSCallerSaved = 4; 54 55 typedef Object* JSCallerSavedBuffer[kNumJSCallerSaved]; 56 57 // Return the code of the n-th caller-saved register available to JavaScript 58 // e.g. JSCallerSavedReg(0) returns r0.code() == 0 59 int JSCallerSavedCode(int n); 60 61 62 // Callee-saved registers preserved when switching from C to JavaScript 63 static const RegList kCalleeSaved = 64 1 << 4 | // r4 v1 65 1 << 5 | // r5 v2 66 1 << 6 | // r6 v3 67 1 << 7 | // r7 v4 68 1 << 8 | // r8 v5 (cp in JavaScript code) 69 kR9Available << 9 | // r9 v6 70 1 << 10 | // r10 v7 71 1 << 11; // r11 v8 (fp in JavaScript code) 72 73 static const int kNumCalleeSaved = 7 + kR9Available; 74 75 // Double registers d8 to d15 are callee-saved. 76 static const int kNumDoubleCalleeSaved = 8; 77 78 79 // Number of registers for which space is reserved in safepoints. Must be a 80 // multiple of 8. 81 // TODO(regis): Only 8 registers may actually be sufficient. Revisit. 82 static const int kNumSafepointRegisters = 16; 83 84 // Define the list of registers actually saved at safepoints. 85 // Note that the number of saved registers may be smaller than the reserved 86 // space, i.e. kNumSafepointSavedRegisters <= kNumSafepointRegisters. 87 static const RegList kSafepointSavedRegisters = kJSCallerSaved | kCalleeSaved; 88 static const int kNumSafepointSavedRegisters = 89 kNumJSCallerSaved + kNumCalleeSaved; 90 91 // ---------------------------------------------------- 92 93 94 class StackHandlerConstants : public AllStatic { 95 public: 96 static const int kNextOffset = 0 * kPointerSize; 97 static const int kStateOffset = 1 * kPointerSize; 98 static const int kFPOffset = 2 * kPointerSize; 99 static const int kPCOffset = 3 * kPointerSize; 100 101 static const int kSize = kPCOffset + kPointerSize; 102 }; 103 104 105 class EntryFrameConstants : public AllStatic { 106 public: 107 static const int kCallerFPOffset = -3 * kPointerSize; 108 }; 109 110 111 class ExitFrameConstants : public AllStatic { 112 public: 113 static const int kCodeOffset = -2 * kPointerSize; 114 static const int kSPOffset = -1 * kPointerSize; 115 116 // The caller fields are below the frame pointer on the stack. 117 static const int kCallerFPOffset = 0 * kPointerSize; 118 // The calling JS function is below FP. 119 static const int kCallerPCOffset = 1 * kPointerSize; 120 121 // FP-relative displacement of the caller's SP. It points just 122 // below the saved PC. 123 static const int kCallerSPDisplacement = 2 * kPointerSize; 124 }; 125 126 127 class StandardFrameConstants : public AllStatic { 128 public: 129 static const int kExpressionsOffset = -3 * kPointerSize; 130 static const int kMarkerOffset = -2 * kPointerSize; 131 static const int kContextOffset = -1 * kPointerSize; 132 static const int kCallerFPOffset = 0 * kPointerSize; 133 static const int kCallerPCOffset = 1 * kPointerSize; 134 static const int kCallerSPOffset = 2 * kPointerSize; 135 }; 136 137 138 class JavaScriptFrameConstants : public AllStatic { 139 public: 140 // FP-relative. 141 static const int kLocal0Offset = StandardFrameConstants::kExpressionsOffset; 142 static const int kLastParameterOffset = +2 * kPointerSize; 143 static const int kFunctionOffset = StandardFrameConstants::kMarkerOffset; 144 145 // Caller SP-relative. 146 static const int kParam0Offset = -2 * kPointerSize; 147 static const int kReceiverOffset = -1 * kPointerSize; 148 }; 149 150 151 class ArgumentsAdaptorFrameConstants : public AllStatic { 152 public: 153 static const int kLengthOffset = StandardFrameConstants::kExpressionsOffset; 154 }; 155 156 157 class InternalFrameConstants : public AllStatic { 158 public: 159 static const int kCodeOffset = StandardFrameConstants::kExpressionsOffset; 160 }; 161 162 163 inline Object* JavaScriptFrame::function_slot_object() const { 164 const int offset = JavaScriptFrameConstants::kFunctionOffset; 165 return Memory::Object_at(fp() + offset); 166 } 167 168 169 } } // namespace v8::internal 170 171 #endif // V8_ARM_FRAMES_ARM_H_ 172
