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_MIPS_FRAME_CONSTANTS_MIPS_H_ 6 #define V8_EXECUTION_MIPS_FRAME_CONSTANTS_MIPS_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 // Stack offsets for arguments passed to JSEntry. 22 static constexpr int kArgcOffset = +0 * kSystemPointerSize; 23 static constexpr int kArgvOffset = +1 * kSystemPointerSize; 24 }; 25 26 class WasmCompileLazyFrameConstants : public TypedFrameConstants { 27 public: 28 static constexpr int kNumberOfSavedGpParamRegs = 3; 29 static constexpr int kNumberOfSavedFpParamRegs = 7; 30 static constexpr int kNumberOfSavedAllParamRegs = 10; 31 32 // FP-relative. 33 // See Generate_WasmCompileLazy in builtins-mips.cc. 34 static constexpr int kWasmInstanceOffset = 35 TYPED_FRAME_PUSHED_VALUE_OFFSET(kNumberOfSavedAllParamRegs); 36 static constexpr int kFixedFrameSizeFromFp = 37 TypedFrameConstants::kFixedFrameSizeFromFp + 38 kNumberOfSavedGpParamRegs * kPointerSize + 39 kNumberOfSavedFpParamRegs * kDoubleSize; 40 }; 41 42 // Frame constructed by the {WasmDebugBreak} builtin. 43 // After pushing the frame type marker, the builtin pushes all Liftoff cache 44 // registers (see liftoff-assembler-defs.h). 45 class WasmDebugBreakFrameConstants : public TypedFrameConstants { 46 public: 47 // {v0, v1, a0, a1, a2, a3, t0, t1, t2, t3, t4, t5, t6, s7} 48 static constexpr uint32_t kPushedGpRegs = 0b111111111111100 + (1 << 23); 49 // {f0, f2, f4, f6, f8, f10, f12, f14, f16, f18, f20, f22, f24} 50 static constexpr uint32_t kPushedFpRegs = 0b1010101010101010101010101; 51 52 static constexpr int kNumPushedGpRegisters = 53 base::bits::CountPopulation(kPushedGpRegs); 54 static constexpr int kNumPushedFpRegisters = 55 base::bits::CountPopulation(kPushedFpRegs); 56 57 static constexpr int kLastPushedGpRegisterOffset = 58 -kFixedFrameSizeFromFp - kNumPushedGpRegisters * kSystemPointerSize; 59 static constexpr int kLastPushedFpRegisterOffset = 60 kLastPushedGpRegisterOffset - kNumPushedFpRegisters * kDoubleSize; 61 62 // Offsets are fp-relative. GetPushedGpRegisterOffset(int reg_code)63 static int GetPushedGpRegisterOffset(int reg_code) { 64 DCHECK_NE(0, kPushedGpRegs & (1 << reg_code)); 65 uint32_t lower_regs = kPushedGpRegs & ((uint32_t{1} << reg_code) - 1); 66 return kLastPushedGpRegisterOffset + 67 base::bits::CountPopulation(lower_regs) * kSystemPointerSize; 68 } 69 GetPushedFpRegisterOffset(int reg_code)70 static int GetPushedFpRegisterOffset(int reg_code) { 71 DCHECK_NE(0, kPushedFpRegs & (1 << reg_code)); 72 uint32_t lower_regs = kPushedFpRegs & ((uint32_t{1} << reg_code) - 1); 73 return kLastPushedFpRegisterOffset + 74 base::bits::CountPopulation(lower_regs) * kDoubleSize; 75 } 76 }; 77 78 } // namespace internal 79 } // namespace v8 80 81 #endif // V8_EXECUTION_MIPS_FRAME_CONSTANTS_MIPS_H_ 82