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/codegen/register.h" 11 #include "src/execution/frame-constants.h" 12 13 namespace v8 { 14 namespace internal { 15 16 class EntryFrameConstants : public AllStatic { 17 public: 18 // This is the offset to where JSEntry pushes the current value of 19 // Isolate::c_entry_fp onto the stack. 20 static constexpr int kCallerFPOffset = -3 * kSystemPointerSize; 21 22 // Stack offsets for arguments passed to JSEntry. 23 static constexpr int kArgcOffset = +0 * kSystemPointerSize; 24 static constexpr int kArgvOffset = +1 * kSystemPointerSize; 25 }; 26 27 class WasmCompileLazyFrameConstants : public TypedFrameConstants { 28 public: 29 static constexpr int kNumberOfSavedGpParamRegs = 3; 30 static constexpr int kNumberOfSavedFpParamRegs = 7; 31 static constexpr int kNumberOfSavedAllParamRegs = 10; 32 33 // FP-relative. 34 // See Generate_WasmCompileLazy in builtins-mips.cc. 35 static constexpr int kWasmInstanceOffset = 36 TYPED_FRAME_PUSHED_VALUE_OFFSET(kNumberOfSavedAllParamRegs); 37 static constexpr int kFixedFrameSizeFromFp = 38 TypedFrameConstants::kFixedFrameSizeFromFp + 39 kNumberOfSavedGpParamRegs * kPointerSize + 40 kNumberOfSavedFpParamRegs * kDoubleSize; 41 }; 42 43 // Frame constructed by the {WasmDebugBreak} builtin. 44 // After pushing the frame type marker, the builtin pushes all Liftoff cache 45 // registers (see liftoff-assembler-defs.h). 46 class WasmDebugBreakFrameConstants : public TypedFrameConstants { 47 public: 48 // {v0, v1, a0, a1, a2, a3, t0, t1, t2, t3, t4, t5, t6, s7} 49 static constexpr RegList kPushedGpRegs = {v0, v1, a0, a1, a2, a3, t0, 50 t1, t2, t3, t4, t5, t6, s7}; 51 // {f0, f2, f4, f6, f8, f10, f12, f14, f16, f18, f20, f22, f24} 52 static constexpr DoubleRegList kPushedFpRegs = { 53 f0, f2, f4, f6, f8, f10, f12, f14, f16, f18, f20, f22, f24}; 54 55 static constexpr int kNumPushedGpRegisters = kPushedGpRegs.Count(); 56 static constexpr int kNumPushedFpRegisters = kPushedFpRegs.Count(); 57 58 static constexpr int kLastPushedGpRegisterOffset = 59 -kFixedFrameSizeFromFp - kNumPushedGpRegisters * kSystemPointerSize; 60 static constexpr int kLastPushedFpRegisterOffset = 61 kLastPushedGpRegisterOffset - kNumPushedFpRegisters * kDoubleSize; 62 63 // Offsets are fp-relative. GetPushedGpRegisterOffset(int reg_code)64 static int GetPushedGpRegisterOffset(int reg_code) { 65 DCHECK_NE(0, kPushedGpRegs.bits() & (1 << reg_code)); 66 uint32_t lower_regs = 67 kPushedGpRegs.bits() & ((uint32_t{1} << reg_code) - 1); 68 return kLastPushedGpRegisterOffset + 69 base::bits::CountPopulation(lower_regs) * kSystemPointerSize; 70 } 71 GetPushedFpRegisterOffset(int reg_code)72 static int GetPushedFpRegisterOffset(int reg_code) { 73 DCHECK_NE(0, kPushedFpRegs.bits() & (1 << reg_code)); 74 uint32_t lower_regs = 75 kPushedFpRegs.bits() & ((uint32_t{1} << reg_code) - 1); 76 return kLastPushedFpRegisterOffset + 77 base::bits::CountPopulation(lower_regs) * kDoubleSize; 78 } 79 }; 80 81 } // namespace internal 82 } // namespace v8 83 84 #endif // V8_EXECUTION_MIPS_FRAME_CONSTANTS_MIPS_H_ 85