1 // Copyright 2012 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_X64_FRAME_CONSTANTS_X64_H_ 6 #define V8_EXECUTION_X64_FRAME_CONSTANTS_X64_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 #ifdef V8_TARGET_OS_WIN 18 static constexpr int kCalleeSaveXMMRegisters = 10; 19 static constexpr int kXMMRegisterSize = 16; 20 static constexpr int kXMMRegistersBlockSize = 21 kXMMRegisterSize * kCalleeSaveXMMRegisters; 22 23 // This is the offset to where JSEntry pushes the current value of 24 // Isolate::c_entry_fp onto the stack. 25 // On x64, there are 7 pushq() and 3 Push() calls between setting up rbp and 26 // pushing the c_entry_fp, plus we manually allocate kXMMRegistersBlockSize 27 // bytes on the stack. 28 static constexpr int kCallerFPOffset = -3 * kSystemPointerSize + 29 -7 * kSystemPointerSize - 30 kXMMRegistersBlockSize; 31 32 // Stack offsets for arguments passed to JSEntry. 33 static constexpr int kArgcOffset = 6 * kSystemPointerSize; 34 static constexpr int kArgvOffset = 7 * kSystemPointerSize; 35 #else 36 // This is the offset to where JSEntry pushes the current value of 37 // Isolate::c_entry_fp onto the stack. 38 // On x64, there are 5 pushq() and 3 Push() calls between setting up rbp and 39 // pushing the c_entry_fp. 40 static constexpr int kCallerFPOffset = 41 -3 * kSystemPointerSize + -5 * kSystemPointerSize; 42 #endif 43 }; 44 45 class WasmCompileLazyFrameConstants : public TypedFrameConstants { 46 public: 47 static constexpr int kNumberOfSavedGpParamRegs = 6; 48 static constexpr int kNumberOfSavedFpParamRegs = 6; 49 50 // FP-relative. 51 static constexpr int kWasmInstanceOffset = TYPED_FRAME_PUSHED_VALUE_OFFSET(0); 52 static constexpr int kFixedFrameSizeFromFp = 53 TypedFrameConstants::kFixedFrameSizeFromFp + 54 kNumberOfSavedGpParamRegs * kSystemPointerSize + 55 kNumberOfSavedFpParamRegs * kSimd128Size; 56 }; 57 58 // Frame constructed by the {WasmDebugBreak} builtin. 59 // After pushing the frame type marker, the builtin pushes all Liftoff cache 60 // registers (see liftoff-assembler-defs.h). 61 class WasmDebugBreakFrameConstants : public TypedFrameConstants { 62 public: 63 // {rax, rcx, rdx, rbx, rsi, rdi, r9} 64 static constexpr uint32_t kPushedGpRegs = 0b1011001111; 65 // {xmm0, xmm1, xmm2, xmm3, xmm4, xmm5, xmm6, xmm7} 66 static constexpr uint32_t kPushedFpRegs = 0b11111111; 67 68 static constexpr int kNumPushedGpRegisters = 69 base::bits::CountPopulation(kPushedGpRegs); 70 static constexpr int kNumPushedFpRegisters = 71 base::bits::CountPopulation(kPushedFpRegs); 72 73 static constexpr int kLastPushedGpRegisterOffset = 74 -kFixedFrameSizeFromFp - kNumPushedGpRegisters * kSystemPointerSize; 75 static constexpr int kLastPushedFpRegisterOffset = 76 kLastPushedGpRegisterOffset - kNumPushedFpRegisters * kSimd128Size; 77 78 // Offsets are fp-relative. GetPushedGpRegisterOffset(int reg_code)79 static int GetPushedGpRegisterOffset(int reg_code) { 80 DCHECK_NE(0, kPushedGpRegs & (1 << reg_code)); 81 uint32_t lower_regs = kPushedGpRegs & ((uint32_t{1} << reg_code) - 1); 82 return kLastPushedGpRegisterOffset + 83 base::bits::CountPopulation(lower_regs) * kSystemPointerSize; 84 } 85 GetPushedFpRegisterOffset(int reg_code)86 static int GetPushedFpRegisterOffset(int reg_code) { 87 DCHECK_NE(0, kPushedFpRegs & (1 << reg_code)); 88 uint32_t lower_regs = kPushedFpRegs & ((uint32_t{1} << reg_code) - 1); 89 return kLastPushedFpRegisterOffset + 90 base::bits::CountPopulation(lower_regs) * kSimd128Size; 91 } 92 }; 93 94 } // namespace internal 95 } // namespace v8 96 97 #endif // V8_EXECUTION_X64_FRAME_CONSTANTS_X64_H_ 98