// Copyright 2011 the V8 project authors. All rights reserved. // Redistribution and use in source and binary forms, with or without // modification, are permitted provided that the following conditions are // met: // // * Redistributions of source code must retain the above copyright // notice, this list of conditions and the following disclaimer. // * Redistributions in binary form must reproduce the above // copyright notice, this list of conditions and the following // disclaimer in the documentation and/or other materials provided // with the distribution. // * Neither the name of Google Inc. nor the names of its // contributors may be used to endorse or promote products derived // from this software without specific prior written permission. // // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. #ifndef V8_ARM_FRAMES_ARM_H_ #define V8_ARM_FRAMES_ARM_H_ namespace v8 { namespace internal { // The ARM ABI does not specify the usage of register r9, which may be reserved // as the static base or thread register on some platforms, in which case we // leave it alone. Adjust the value of kR9Available accordingly: static const int kR9Available = 1; // 1 if available to us, 0 if reserved // Register list in load/store instructions // Note that the bit values must match those used in actual instruction encoding static const int kNumRegs = 16; // Caller-saved/arguments registers static const RegList kJSCallerSaved = 1 << 0 | // r0 a1 1 << 1 | // r1 a2 1 << 2 | // r2 a3 1 << 3; // r3 a4 static const int kNumJSCallerSaved = 4; typedef Object* JSCallerSavedBuffer[kNumJSCallerSaved]; // Return the code of the n-th caller-saved register available to JavaScript // e.g. JSCallerSavedReg(0) returns r0.code() == 0 int JSCallerSavedCode(int n); // Callee-saved registers preserved when switching from C to JavaScript static const RegList kCalleeSaved = 1 << 4 | // r4 v1 1 << 5 | // r5 v2 1 << 6 | // r6 v3 1 << 7 | // r7 v4 1 << 8 | // r8 v5 (cp in JavaScript code) kR9Available << 9 | // r9 v6 1 << 10 | // r10 v7 1 << 11; // r11 v8 (fp in JavaScript code) // When calling into C++ (only for C++ calls that can't cause a GC). // The call code will take care of lr, fp, etc. static const RegList kCallerSaved = 1 << 0 | // r0 1 << 1 | // r1 1 << 2 | // r2 1 << 3 | // r3 1 << 9; // r9 static const int kNumCalleeSaved = 7 + kR9Available; // Double registers d8 to d15 are callee-saved. static const int kNumDoubleCalleeSaved = 8; // Number of registers for which space is reserved in safepoints. Must be a // multiple of 8. // TODO(regis): Only 8 registers may actually be sufficient. Revisit. static const int kNumSafepointRegisters = 16; // Define the list of registers actually saved at safepoints. // Note that the number of saved registers may be smaller than the reserved // space, i.e. kNumSafepointSavedRegisters <= kNumSafepointRegisters. static const RegList kSafepointSavedRegisters = kJSCallerSaved | kCalleeSaved; static const int kNumSafepointSavedRegisters = kNumJSCallerSaved + kNumCalleeSaved; // ---------------------------------------------------- class StackHandlerConstants : public AllStatic { public: static const int kNextOffset = 0 * kPointerSize; static const int kStateOffset = 1 * kPointerSize; static const int kContextOffset = 2 * kPointerSize; static const int kFPOffset = 3 * kPointerSize; static const int kPCOffset = 4 * kPointerSize; static const int kSize = kPCOffset + kPointerSize; }; class EntryFrameConstants : public AllStatic { public: static const int kCallerFPOffset = -3 * kPointerSize; }; class ExitFrameConstants : public AllStatic { public: static const int kCodeOffset = -2 * kPointerSize; static const int kSPOffset = -1 * kPointerSize; // The caller fields are below the frame pointer on the stack. static const int kCallerFPOffset = 0 * kPointerSize; // The calling JS function is below FP. static const int kCallerPCOffset = 1 * kPointerSize; // FP-relative displacement of the caller's SP. It points just // below the saved PC. static const int kCallerSPDisplacement = 2 * kPointerSize; }; class StandardFrameConstants : public AllStatic { public: static const int kExpressionsOffset = -3 * kPointerSize; static const int kMarkerOffset = -2 * kPointerSize; static const int kContextOffset = -1 * kPointerSize; static const int kCallerFPOffset = 0 * kPointerSize; static const int kCallerPCOffset = 1 * kPointerSize; static const int kCallerSPOffset = 2 * kPointerSize; }; class JavaScriptFrameConstants : public AllStatic { public: // FP-relative. static const int kLocal0Offset = StandardFrameConstants::kExpressionsOffset; static const int kLastParameterOffset = +2 * kPointerSize; static const int kFunctionOffset = StandardFrameConstants::kMarkerOffset; // Caller SP-relative. static const int kParam0Offset = -2 * kPointerSize; static const int kReceiverOffset = -1 * kPointerSize; }; class ArgumentsAdaptorFrameConstants : public AllStatic { public: static const int kLengthOffset = StandardFrameConstants::kExpressionsOffset; }; class InternalFrameConstants : public AllStatic { public: static const int kCodeOffset = StandardFrameConstants::kExpressionsOffset; }; inline Object* JavaScriptFrame::function_slot_object() const { const int offset = JavaScriptFrameConstants::kFunctionOffset; return Memory::Object_at(fp() + offset); } } } // namespace v8::internal #endif // V8_ARM_FRAMES_ARM_H_