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/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 #ifdef V8_TARGET_OS_WIN 19 static constexpr int kCalleeSaveXMMRegisters = 10; 20 static constexpr int kXMMRegisterSize = 16; 21 static constexpr int kXMMRegistersBlockSize = 22 kXMMRegisterSize * kCalleeSaveXMMRegisters; 23 24 // This is the offset to where JSEntry pushes the current value of 25 // Isolate::c_entry_fp onto the stack. 26 // On x64, there are 7 pushq() and 3 Push() calls between setting up rbp and 27 // pushing the c_entry_fp, plus we manually allocate kXMMRegistersBlockSize 28 // bytes on the stack. 29 static constexpr int kCallerFPOffset = -3 * kSystemPointerSize + 30 -7 * kSystemPointerSize - 31 kXMMRegistersBlockSize; 32 33 // Stack offsets for arguments passed to JSEntry. 34 static constexpr int kArgcOffset = 6 * kSystemPointerSize; 35 static constexpr int kArgvOffset = 7 * kSystemPointerSize; 36 #else 37 // This is the offset to where JSEntry pushes the current value of 38 // Isolate::c_entry_fp onto the stack. 39 // On x64, there are 5 pushq() and 3 Push() calls between setting up rbp and 40 // pushing the c_entry_fp. 41 static constexpr int kCallerFPOffset = 42 -3 * kSystemPointerSize + -5 * kSystemPointerSize; 43 #endif 44 }; 45 46 class WasmCompileLazyFrameConstants : public TypedFrameConstants { 47 public: 48 static constexpr int kNumberOfSavedGpParamRegs = 6; 49 static constexpr int kNumberOfSavedFpParamRegs = 6; 50 51 // FP-relative. 52 static constexpr int kWasmInstanceOffset = TYPED_FRAME_PUSHED_VALUE_OFFSET(0); 53 static constexpr int kFixedFrameSizeFromFp = 54 TypedFrameConstants::kFixedFrameSizeFromFp + 55 kNumberOfSavedGpParamRegs * kSystemPointerSize + 56 kNumberOfSavedFpParamRegs * kSimd128Size; 57 }; 58 59 // Frame constructed by the {WasmDebugBreak} builtin. 60 // After pushing the frame type marker, the builtin pushes all Liftoff cache 61 // registers (see liftoff-assembler-defs.h). 62 class WasmDebugBreakFrameConstants : public TypedFrameConstants { 63 public: 64 static constexpr RegList kPushedGpRegs = {rax, rcx, rdx, rbx, rsi, rdi, r9}; 65 66 static constexpr DoubleRegList kPushedFpRegs = {xmm0, xmm1, xmm2, xmm3, 67 xmm4, xmm5, xmm6, xmm7}; 68 69 static constexpr int kNumPushedGpRegisters = kPushedGpRegs.Count(); 70 static constexpr int kNumPushedFpRegisters = kPushedFpRegs.Count(); 71 72 static constexpr int kLastPushedGpRegisterOffset = 73 -kFixedFrameSizeFromFp - kNumPushedGpRegisters * kSystemPointerSize; 74 static constexpr int kLastPushedFpRegisterOffset = 75 kLastPushedGpRegisterOffset - kNumPushedFpRegisters * kSimd128Size; 76 77 // Offsets are fp-relative. GetPushedGpRegisterOffset(int reg_code)78 static int GetPushedGpRegisterOffset(int reg_code) { 79 DCHECK_NE(0, kPushedGpRegs.bits() & (1 << reg_code)); 80 uint32_t lower_regs = 81 kPushedGpRegs.bits() & ((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.bits() & (1 << reg_code)); 88 uint32_t lower_regs = 89 kPushedFpRegs.bits() & ((uint32_t{1} << reg_code) - 1); 90 return kLastPushedFpRegisterOffset + 91 base::bits::CountPopulation(lower_regs) * kSimd128Size; 92 } 93 }; 94 95 } // namespace internal 96 } // namespace v8 97 98 #endif // V8_EXECUTION_X64_FRAME_CONSTANTS_X64_H_ 99