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 70 << 9 | // r9 v6 71 1 << 10 | // r10 v7 72 1 << 11; // r11 v8 (fp in JavaScript code) 73 74 static const int kNumCalleeSaved = 7 + kR9Available; 75 76 77 // ---------------------------------------------------- 78 79 80 class StackHandlerConstants : public AllStatic { 81 public: 82 static const int kNextOffset = 0 * kPointerSize; 83 static const int kStateOffset = 1 * kPointerSize; 84 static const int kFPOffset = 2 * kPointerSize; 85 static const int kPCOffset = 3 * kPointerSize; 86 87 static const int kSize = kPCOffset + kPointerSize; 88 }; 89 90 91 class EntryFrameConstants : public AllStatic { 92 public: 93 static const int kCallerFPOffset = -3 * kPointerSize; 94 }; 95 96 97 class ExitFrameConstants : public AllStatic { 98 public: 99 // Exit frames have a debug marker on the stack. 100 static const int kSPDisplacement = -1 * kPointerSize; 101 102 // The debug marker is just above the frame pointer. 103 static const int kCodeOffset = -1 * kPointerSize; 104 105 static const int kSavedRegistersOffset = 0 * kPointerSize; 106 107 // The caller fields are below the frame pointer on the stack. 108 static const int kCallerFPOffset = +0 * kPointerSize; 109 // The calling JS function is between FP and PC. 110 static const int kCallerPCOffset = +2 * kPointerSize; 111 112 // FP-relative displacement of the caller's SP. It points just 113 // below the saved PC. 114 static const int kCallerSPDisplacement = +3 * kPointerSize; 115 }; 116 117 118 class StandardFrameConstants : public AllStatic { 119 public: 120 static const int kExpressionsOffset = -3 * kPointerSize; 121 static const int kMarkerOffset = -2 * kPointerSize; 122 static const int kContextOffset = -1 * kPointerSize; 123 static const int kCallerFPOffset = 0 * kPointerSize; 124 static const int kCallerPCOffset = +1 * kPointerSize; 125 static const int kCallerSPOffset = +2 * kPointerSize; 126 }; 127 128 129 class JavaScriptFrameConstants : public AllStatic { 130 public: 131 // FP-relative. 132 static const int kLocal0Offset = StandardFrameConstants::kExpressionsOffset; 133 static const int kSavedRegistersOffset = +2 * kPointerSize; 134 static const int kFunctionOffset = StandardFrameConstants::kMarkerOffset; 135 136 // Caller SP-relative. 137 static const int kParam0Offset = -2 * kPointerSize; 138 static const int kReceiverOffset = -1 * kPointerSize; 139 }; 140 141 142 class ArgumentsAdaptorFrameConstants : public AllStatic { 143 public: 144 static const int kLengthOffset = StandardFrameConstants::kExpressionsOffset; 145 }; 146 147 148 class InternalFrameConstants : public AllStatic { 149 public: 150 static const int kCodeOffset = StandardFrameConstants::kExpressionsOffset; 151 }; 152 153 154 inline Object* JavaScriptFrame::function_slot_object() const { 155 const int offset = JavaScriptFrameConstants::kFunctionOffset; 156 return Memory::Object_at(fp() + offset); 157 } 158 159 160 } } // namespace v8::internal 161 162 #endif // V8_ARM_FRAMES_ARM_H_ 163
