// Copyright 2011 the V8 project authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. #ifndef V8_MIPS_FRAMES_MIPS_H_ #define V8_MIPS_FRAMES_MIPS_H_ namespace v8 { namespace internal { // Register lists. // Note that the bit values must match those used in actual instruction // encoding. const int kNumRegs = 32; const RegList kJSCallerSaved = 1 << 2 | // v0 1 << 3 | // v1 1 << 4 | // a0 1 << 5 | // a1 1 << 6 | // a2 1 << 7 | // a3 1 << 8 | // a4 1 << 9 | // a5 1 << 10 | // a6 1 << 11 | // a7 1 << 12 | // t0 1 << 13 | // t1 1 << 14 | // t2 1 << 15; // t3 const int kNumJSCallerSaved = 14; // Return the code of the n-th caller-saved register available to JavaScript // e.g. JSCallerSavedReg(0) returns a0.code() == 4. int JSCallerSavedCode(int n); // Callee-saved registers preserved when switching from C to JavaScript. const RegList kCalleeSaved = 1 << 16 | // s0 1 << 17 | // s1 1 << 18 | // s2 1 << 19 | // s3 1 << 20 | // s4 1 << 21 | // s5 1 << 22 | // s6 (roots in Javascript code) 1 << 23 | // s7 (cp in Javascript code) 1 << 30; // fp/s8 const int kNumCalleeSaved = 9; const RegList kCalleeSavedFPU = 1 << 20 | // f20 1 << 22 | // f22 1 << 24 | // f24 1 << 26 | // f26 1 << 28 | // f28 1 << 30; // f30 const int kNumCalleeSavedFPU = 6; const RegList kCallerSavedFPU = 1 << 0 | // f0 1 << 2 | // f2 1 << 4 | // f4 1 << 6 | // f6 1 << 8 | // f8 1 << 10 | // f10 1 << 12 | // f12 1 << 14 | // f14 1 << 16 | // f16 1 << 18; // f18 // Number of registers for which space is reserved in safepoints. Must be a // multiple of 8. const int kNumSafepointRegisters = 24; // 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. const RegList kSafepointSavedRegisters = kJSCallerSaved | kCalleeSaved; const int kNumSafepointSavedRegisters = kNumJSCallerSaved + kNumCalleeSaved; const int kUndefIndex = -1; // Map with indexes on stack that corresponds to codes of saved registers. const int kSafepointRegisterStackIndexMap[kNumRegs] = { kUndefIndex, // zero_reg kUndefIndex, // at 0, // v0 1, // v1 2, // a0 3, // a1 4, // a2 5, // a3 6, // a4 7, // a5 8, // a6 9, // a7 10, // t0 11, // t1 12, // t2 13, // t3 14, // s0 15, // s1 16, // s2 17, // s3 18, // s4 19, // s5 20, // s6 21, // s7 kUndefIndex, // t8 kUndefIndex, // t9 kUndefIndex, // k0 kUndefIndex, // k1 kUndefIndex, // gp kUndefIndex, // sp 22, // fp kUndefIndex }; // ---------------------------------------------------- class EntryFrameConstants : public AllStatic { public: static const int kCallerFPOffset = -(StandardFrameConstants::kFixedFrameSizeFromFp + kPointerSize); }; class ExitFrameConstants : public AllStatic { public: static const int kFrameSize = 2 * kPointerSize; 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 between FP and PC. static const int kCallerPCOffset = +1 * kPointerSize; // MIPS-specific: a pointer to the old sp to avoid unnecessary calculations. static const int kCallerSPOffset = +2 * kPointerSize; // FP-relative displacement of the caller's SP. static const int kCallerSPDisplacement = +2 * kPointerSize; static const int kConstantPoolOffset = 0; // Not used. }; 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; }; } } // namespace v8::internal #endif