1 // Copyright 2011 the V8 project authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef V8_EXECUTION_MIPS64_FRAME_CONSTANTS_MIPS64_H_ 6 #define V8_EXECUTION_MIPS64_FRAME_CONSTANTS_MIPS64_H_ 7 8 #include "src/base/bits.h" 9 #include "src/base/macros.h" 10 #include "src/execution/frame-constants.h" 11 12 namespace v8 { 13 namespace internal { 14 15 class EntryFrameConstants : public AllStatic { 16 public: 17 // This is the offset to where JSEntry pushes the current value of 18 // Isolate::c_entry_fp onto the stack. 19 static constexpr int kCallerFPOffset = -3 * kSystemPointerSize; 20 }; 21 22 class WasmCompileLazyFrameConstants : public TypedFrameConstants { 23 public: 24 static constexpr int kNumberOfSavedGpParamRegs = 7; 25 static constexpr int kNumberOfSavedFpParamRegs = 7; 26 static constexpr int kNumberOfSavedAllParamRegs = 14; 27 28 // FP-relative. 29 // See Generate_WasmCompileLazy in builtins-mips64.cc. 30 static constexpr int kWasmInstanceOffset = 31 TYPED_FRAME_PUSHED_VALUE_OFFSET(kNumberOfSavedAllParamRegs); 32 static constexpr int kFixedFrameSizeFromFp = 33 TypedFrameConstants::kFixedFrameSizeFromFp + 34 kNumberOfSavedGpParamRegs * kPointerSize + 35 kNumberOfSavedFpParamRegs * kDoubleSize; 36 }; 37 38 // Frame constructed by the {WasmDebugBreak} builtin. 39 // After pushing the frame type marker, the builtin pushes all Liftoff cache 40 // registers (see liftoff-assembler-defs.h). 41 class WasmDebugBreakFrameConstants : public TypedFrameConstants { 42 public: 43 // {v0, v1, a0, a1, a2, a3, a4, a5, a6, a7, t0, t1, t2, s7} 44 static constexpr uint32_t kPushedGpRegs = 0b111111111111100 + (1 << 23); 45 // {f0, f2, f4, f6, f8, f10, f12, f14, f16, f18, f20, f22, f24, f26} 46 static constexpr uint32_t kPushedFpRegs = 0b101010101010101010101010101; 47 48 static constexpr int kNumPushedGpRegisters = 49 base::bits::CountPopulation(kPushedGpRegs); 50 static constexpr int kNumPushedFpRegisters = 51 base::bits::CountPopulation(kPushedFpRegs); 52 53 static constexpr int kLastPushedGpRegisterOffset = 54 -kFixedFrameSizeFromFp - kNumPushedGpRegisters * kSystemPointerSize; 55 static constexpr int kLastPushedFpRegisterOffset = 56 kLastPushedGpRegisterOffset - kNumPushedFpRegisters * kDoubleSize; 57 58 // Offsets are fp-relative. GetPushedGpRegisterOffset(int reg_code)59 static int GetPushedGpRegisterOffset(int reg_code) { 60 DCHECK_NE(0, kPushedGpRegs & (1 << reg_code)); 61 uint32_t lower_regs = kPushedGpRegs & ((uint32_t{1} << reg_code) - 1); 62 return kLastPushedGpRegisterOffset + 63 base::bits::CountPopulation(lower_regs) * kSystemPointerSize; 64 } 65 GetPushedFpRegisterOffset(int reg_code)66 static int GetPushedFpRegisterOffset(int reg_code) { 67 DCHECK_NE(0, kPushedFpRegs & (1 << reg_code)); 68 uint32_t lower_regs = kPushedFpRegs & ((uint32_t{1} << reg_code) - 1); 69 return kLastPushedFpRegisterOffset + 70 base::bits::CountPopulation(lower_regs) * kDoubleSize; 71 } 72 }; 73 74 } // namespace internal 75 } // namespace v8 76 77 #endif // V8_EXECUTION_MIPS64_FRAME_CONSTANTS_MIPS64_H_ 78