1 // Copyright 2012 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 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 const int kNumRegs = 16; 44 45 46 // Caller-saved/arguments registers 47 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 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 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 // When calling into C++ (only for C++ calls that can't cause a GC). 74 // The call code will take care of lr, fp, etc. 75 const RegList kCallerSaved = 76 1 << 0 | // r0 77 1 << 1 | // r1 78 1 << 2 | // r2 79 1 << 3 | // r3 80 1 << 9; // r9 81 82 83 const int kNumCalleeSaved = 7 + kR9Available; 84 85 // Double registers d8 to d15 are callee-saved. 86 const int kNumDoubleCalleeSaved = 8; 87 88 89 // Number of registers for which space is reserved in safepoints. Must be a 90 // multiple of 8. 91 // TODO(regis): Only 8 registers may actually be sufficient. Revisit. 92 const int kNumSafepointRegisters = 16; 93 94 // Define the list of registers actually saved at safepoints. 95 // Note that the number of saved registers may be smaller than the reserved 96 // space, i.e. kNumSafepointSavedRegisters <= kNumSafepointRegisters. 97 const RegList kSafepointSavedRegisters = kJSCallerSaved | kCalleeSaved; 98 const int kNumSafepointSavedRegisters = kNumJSCallerSaved + kNumCalleeSaved; 99 100 // ---------------------------------------------------- 101 102 103 class StackHandlerConstants : public AllStatic { 104 public: 105 static const int kNextOffset = 0 * kPointerSize; 106 static const int kCodeOffset = 1 * kPointerSize; 107 static const int kStateOffset = 2 * kPointerSize; 108 static const int kContextOffset = 3 * kPointerSize; 109 static const int kFPOffset = 4 * kPointerSize; 110 111 static const int kSize = kFPOffset + kPointerSize; 112 }; 113 114 115 class EntryFrameConstants : public AllStatic { 116 public: 117 static const int kCallerFPOffset = -3 * kPointerSize; 118 }; 119 120 121 class ExitFrameConstants : public AllStatic { 122 public: 123 static const int kCodeOffset = -2 * kPointerSize; 124 static const int kSPOffset = -1 * kPointerSize; 125 126 // The caller fields are below the frame pointer on the stack. 127 static const int kCallerFPOffset = 0 * kPointerSize; 128 // The calling JS function is below FP. 129 static const int kCallerPCOffset = 1 * kPointerSize; 130 131 // FP-relative displacement of the caller's SP. It points just 132 // below the saved PC. 133 static const int kCallerSPDisplacement = 2 * kPointerSize; 134 }; 135 136 137 class StandardFrameConstants : public AllStatic { 138 public: 139 // Fixed part of the frame consists of return address, caller fp, 140 // context and function. 141 static const int kFixedFrameSize = 4 * kPointerSize; 142 static const int kExpressionsOffset = -3 * kPointerSize; 143 static const int kMarkerOffset = -2 * kPointerSize; 144 static const int kContextOffset = -1 * kPointerSize; 145 static const int kCallerFPOffset = 0 * kPointerSize; 146 static const int kCallerPCOffset = 1 * kPointerSize; 147 static const int kCallerSPOffset = 2 * kPointerSize; 148 }; 149 150 151 class JavaScriptFrameConstants : public AllStatic { 152 public: 153 // FP-relative. 154 static const int kLocal0Offset = StandardFrameConstants::kExpressionsOffset; 155 static const int kLastParameterOffset = +2 * kPointerSize; 156 static const int kFunctionOffset = StandardFrameConstants::kMarkerOffset; 157 158 // Caller SP-relative. 159 static const int kParam0Offset = -2 * kPointerSize; 160 static const int kReceiverOffset = -1 * kPointerSize; 161 }; 162 163 164 class ArgumentsAdaptorFrameConstants : public AllStatic { 165 public: 166 static const int kLengthOffset = StandardFrameConstants::kExpressionsOffset; 167 static const int kFrameSize = 168 StandardFrameConstants::kFixedFrameSize + kPointerSize; 169 }; 170 171 172 class InternalFrameConstants : public AllStatic { 173 public: 174 static const int kCodeOffset = StandardFrameConstants::kExpressionsOffset; 175 }; 176 177 178 inline Object* JavaScriptFrame::function_slot_object() const { 179 const int offset = JavaScriptFrameConstants::kFunctionOffset; 180 return Memory::Object_at(fp() + offset); 181 } 182 183 184 } } // namespace v8::internal 185 186 #endif // V8_ARM_FRAMES_ARM_H_ 187
