diff options
Diffstat (limited to 'js/src/jit/x64/Assembler-x64.h')
| -rw-r--r-- | js/src/jit/x64/Assembler-x64.h | 1040 |
1 files changed, 1040 insertions, 0 deletions
diff --git a/js/src/jit/x64/Assembler-x64.h b/js/src/jit/x64/Assembler-x64.h new file mode 100644 index 000000000..30e384158 --- /dev/null +++ b/js/src/jit/x64/Assembler-x64.h @@ -0,0 +1,1040 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- + * vim: set ts=8 sts=4 et sw=4 tw=99: + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#ifndef jit_x64_Assembler_x64_h +#define jit_x64_Assembler_x64_h + +#include "mozilla/ArrayUtils.h" + +#include "jit/IonCode.h" +#include "jit/JitCompartment.h" +#include "jit/shared/Assembler-shared.h" + +namespace js { +namespace jit { + +static constexpr Register rax = { X86Encoding::rax }; +static constexpr Register rbx = { X86Encoding::rbx }; +static constexpr Register rcx = { X86Encoding::rcx }; +static constexpr Register rdx = { X86Encoding::rdx }; +static constexpr Register rsi = { X86Encoding::rsi }; +static constexpr Register rdi = { X86Encoding::rdi }; +static constexpr Register rbp = { X86Encoding::rbp }; +static constexpr Register r8 = { X86Encoding::r8 }; +static constexpr Register r9 = { X86Encoding::r9 }; +static constexpr Register r10 = { X86Encoding::r10 }; +static constexpr Register r11 = { X86Encoding::r11 }; +static constexpr Register r12 = { X86Encoding::r12 }; +static constexpr Register r13 = { X86Encoding::r13 }; +static constexpr Register r14 = { X86Encoding::r14 }; +static constexpr Register r15 = { X86Encoding::r15 }; +static constexpr Register rsp = { X86Encoding::rsp }; + +static constexpr FloatRegister xmm0 = FloatRegister(X86Encoding::xmm0, FloatRegisters::Double); +static constexpr FloatRegister xmm1 = FloatRegister(X86Encoding::xmm1, FloatRegisters::Double); +static constexpr FloatRegister xmm2 = FloatRegister(X86Encoding::xmm2, FloatRegisters::Double); +static constexpr FloatRegister xmm3 = FloatRegister(X86Encoding::xmm3, FloatRegisters::Double); +static constexpr FloatRegister xmm4 = FloatRegister(X86Encoding::xmm4, FloatRegisters::Double); +static constexpr FloatRegister xmm5 = FloatRegister(X86Encoding::xmm5, FloatRegisters::Double); +static constexpr FloatRegister xmm6 = FloatRegister(X86Encoding::xmm6, FloatRegisters::Double); +static constexpr FloatRegister xmm7 = FloatRegister(X86Encoding::xmm7, FloatRegisters::Double); +static constexpr FloatRegister xmm8 = FloatRegister(X86Encoding::xmm8, FloatRegisters::Double); +static constexpr FloatRegister xmm9 = FloatRegister(X86Encoding::xmm9, FloatRegisters::Double); +static constexpr FloatRegister xmm10 = FloatRegister(X86Encoding::xmm10, FloatRegisters::Double); +static constexpr FloatRegister xmm11 = FloatRegister(X86Encoding::xmm11, FloatRegisters::Double); +static constexpr FloatRegister xmm12 = FloatRegister(X86Encoding::xmm12, FloatRegisters::Double); +static constexpr FloatRegister xmm13 = FloatRegister(X86Encoding::xmm13, FloatRegisters::Double); +static constexpr FloatRegister xmm14 = FloatRegister(X86Encoding::xmm14, FloatRegisters::Double); +static constexpr FloatRegister xmm15 = FloatRegister(X86Encoding::xmm15, FloatRegisters::Double); + +// X86-common synonyms. +static constexpr Register eax = rax; +static constexpr Register ebx = rbx; +static constexpr Register ecx = rcx; +static constexpr Register edx = rdx; +static constexpr Register esi = rsi; +static constexpr Register edi = rdi; +static constexpr Register ebp = rbp; +static constexpr Register esp = rsp; + +static constexpr Register InvalidReg = { X86Encoding::invalid_reg }; +static constexpr FloatRegister InvalidFloatReg = FloatRegister(); + +static constexpr Register StackPointer = rsp; +static constexpr Register FramePointer = rbp; +static constexpr Register JSReturnReg = rcx; +// Avoid, except for assertions. +static constexpr Register JSReturnReg_Type = JSReturnReg; +static constexpr Register JSReturnReg_Data = JSReturnReg; + +static constexpr Register ScratchReg = r11; + +// Helper class for ScratchRegister usage. Asserts that only one piece +// of code thinks it has exclusive ownership of the scratch register. +struct ScratchRegisterScope : public AutoRegisterScope +{ + explicit ScratchRegisterScope(MacroAssembler& masm) + : AutoRegisterScope(masm, ScratchReg) + { } +}; + +static constexpr Register ReturnReg = rax; +static constexpr Register HeapReg = r15; +static constexpr Register64 ReturnReg64(rax); +static constexpr FloatRegister ReturnFloat32Reg = FloatRegister(X86Encoding::xmm0, FloatRegisters::Single); +static constexpr FloatRegister ReturnDoubleReg = FloatRegister(X86Encoding::xmm0, FloatRegisters::Double); +static constexpr FloatRegister ReturnSimd128Reg = FloatRegister(X86Encoding::xmm0, FloatRegisters::Simd128); +static constexpr FloatRegister ScratchFloat32Reg = FloatRegister(X86Encoding::xmm15, FloatRegisters::Single); +static constexpr FloatRegister ScratchDoubleReg = FloatRegister(X86Encoding::xmm15, FloatRegisters::Double); +static constexpr FloatRegister ScratchSimd128Reg = xmm15; + +// Avoid rbp, which is the FramePointer, which is unavailable in some modes. +static constexpr Register ArgumentsRectifierReg = r8; +static constexpr Register CallTempReg0 = rax; +static constexpr Register CallTempReg1 = rdi; +static constexpr Register CallTempReg2 = rbx; +static constexpr Register CallTempReg3 = rcx; +static constexpr Register CallTempReg4 = rsi; +static constexpr Register CallTempReg5 = rdx; + +// Different argument registers for WIN64 +#if defined(_WIN64) +static constexpr Register IntArgReg0 = rcx; +static constexpr Register IntArgReg1 = rdx; +static constexpr Register IntArgReg2 = r8; +static constexpr Register IntArgReg3 = r9; +static constexpr uint32_t NumIntArgRegs = 4; +// Use "const" instead of constexpr here to work around a bug +// of VS2015 Update 1. See bug 1229604. +static const Register IntArgRegs[NumIntArgRegs] = { rcx, rdx, r8, r9 }; + +static const Register CallTempNonArgRegs[] = { rax, rdi, rbx, rsi }; +static const uint32_t NumCallTempNonArgRegs = + mozilla::ArrayLength(CallTempNonArgRegs); + +static constexpr FloatRegister FloatArgReg0 = xmm0; +static constexpr FloatRegister FloatArgReg1 = xmm1; +static constexpr FloatRegister FloatArgReg2 = xmm2; +static constexpr FloatRegister FloatArgReg3 = xmm3; +static const uint32_t NumFloatArgRegs = 4; +static constexpr FloatRegister FloatArgRegs[NumFloatArgRegs] = { xmm0, xmm1, xmm2, xmm3 }; +#else +static constexpr Register IntArgReg0 = rdi; +static constexpr Register IntArgReg1 = rsi; +static constexpr Register IntArgReg2 = rdx; +static constexpr Register IntArgReg3 = rcx; +static constexpr Register IntArgReg4 = r8; +static constexpr Register IntArgReg5 = r9; +static constexpr uint32_t NumIntArgRegs = 6; +static const Register IntArgRegs[NumIntArgRegs] = { rdi, rsi, rdx, rcx, r8, r9 }; + +// Use "const" instead of constexpr here to work around a bug +// of VS2015 Update 1. See bug 1229604. +static const Register CallTempNonArgRegs[] = { rax, rbx }; +static const uint32_t NumCallTempNonArgRegs = + mozilla::ArrayLength(CallTempNonArgRegs); + +static constexpr FloatRegister FloatArgReg0 = xmm0; +static constexpr FloatRegister FloatArgReg1 = xmm1; +static constexpr FloatRegister FloatArgReg2 = xmm2; +static constexpr FloatRegister FloatArgReg3 = xmm3; +static constexpr FloatRegister FloatArgReg4 = xmm4; +static constexpr FloatRegister FloatArgReg5 = xmm5; +static constexpr FloatRegister FloatArgReg6 = xmm6; +static constexpr FloatRegister FloatArgReg7 = xmm7; +static constexpr uint32_t NumFloatArgRegs = 8; +static constexpr FloatRegister FloatArgRegs[NumFloatArgRegs] = { xmm0, xmm1, xmm2, xmm3, xmm4, xmm5, xmm6, xmm7 }; +#endif + +// Registers used in the GenerateFFIIonExit Enable Activation block. +static constexpr Register WasmIonExitRegCallee = r10; +static constexpr Register WasmIonExitRegE0 = rax; +static constexpr Register WasmIonExitRegE1 = rdi; + +// Registers used in the GenerateFFIIonExit Disable Activation block. +static constexpr Register WasmIonExitRegReturnData = ecx; +static constexpr Register WasmIonExitRegReturnType = ecx; +static constexpr Register WasmIonExitRegD0 = rax; +static constexpr Register WasmIonExitRegD1 = rdi; +static constexpr Register WasmIonExitRegD2 = rbx; + +// Registerd used in RegExpMatcher instruction (do not use JSReturnOperand). +static constexpr Register RegExpMatcherRegExpReg = CallTempReg0; +static constexpr Register RegExpMatcherStringReg = CallTempReg1; +static constexpr Register RegExpMatcherLastIndexReg = CallTempReg2; + +// Registerd used in RegExpTester instruction (do not use ReturnReg). +static constexpr Register RegExpTesterRegExpReg = CallTempReg1; +static constexpr Register RegExpTesterStringReg = CallTempReg2; +static constexpr Register RegExpTesterLastIndexReg = CallTempReg3; + +class ABIArgGenerator +{ +#if defined(XP_WIN) + unsigned regIndex_; +#else + unsigned intRegIndex_; + unsigned floatRegIndex_; +#endif + uint32_t stackOffset_; + ABIArg current_; + + public: + ABIArgGenerator(); + ABIArg next(MIRType argType); + ABIArg& current() { return current_; } + uint32_t stackBytesConsumedSoFar() const { return stackOffset_; } +}; + +// Avoid r11, which is the MacroAssembler's ScratchReg. +static constexpr Register ABINonArgReg0 = rax; +static constexpr Register ABINonArgReg1 = rbx; +static constexpr Register ABINonArgReg2 = r10; + +// Note: these three registers are all guaranteed to be different +static constexpr Register ABINonArgReturnReg0 = r10; +static constexpr Register ABINonArgReturnReg1 = r12; +static constexpr Register ABINonVolatileReg = r13; + +// TLS pointer argument register for WebAssembly functions. This must not alias +// any other register used for passing function arguments or return values. +// Preserved by WebAssembly functions. +static constexpr Register WasmTlsReg = r14; + +// Registers used for asm.js/wasm table calls. These registers must be disjoint +// from the ABI argument registers, WasmTlsReg and each other. +static constexpr Register WasmTableCallScratchReg = ABINonArgReg0; +static constexpr Register WasmTableCallSigReg = ABINonArgReg1; +static constexpr Register WasmTableCallIndexReg = ABINonArgReg2; + +static constexpr Register OsrFrameReg = IntArgReg3; + +static constexpr Register PreBarrierReg = rdx; + +static constexpr uint32_t ABIStackAlignment = 16; +static constexpr uint32_t CodeAlignment = 16; +static constexpr uint32_t JitStackAlignment = 16; + +static constexpr uint32_t JitStackValueAlignment = JitStackAlignment / sizeof(Value); +static_assert(JitStackAlignment % sizeof(Value) == 0 && JitStackValueAlignment >= 1, + "Stack alignment should be a non-zero multiple of sizeof(Value)"); + +// This boolean indicates whether we support SIMD instructions flavoured for +// this architecture or not. Rather than a method in the LIRGenerator, it is +// here such that it is accessible from the entire codebase. Once full support +// for SIMD is reached on all tier-1 platforms, this constant can be deleted. +static constexpr bool SupportsSimd = true; +static constexpr uint32_t SimdMemoryAlignment = 16; + +static_assert(CodeAlignment % SimdMemoryAlignment == 0, + "Code alignment should be larger than any of the alignments which are used for " + "the constant sections of the code buffer. Thus it should be larger than the " + "alignment for SIMD constants."); + +static_assert(JitStackAlignment % SimdMemoryAlignment == 0, + "Stack alignment should be larger than any of the alignments which are used for " + "spilled values. Thus it should be larger than the alignment for SIMD accesses."); + +static const uint32_t WasmStackAlignment = SimdMemoryAlignment; + +static const Scale ScalePointer = TimesEight; + +} // namespace jit +} // namespace js + +#include "jit/x86-shared/Assembler-x86-shared.h" + +namespace js { +namespace jit { + +// Return operand from a JS -> JS call. +static constexpr ValueOperand JSReturnOperand = ValueOperand(JSReturnReg); + +class Assembler : public AssemblerX86Shared +{ + // x64 jumps may need extra bits of relocation, because a jump may extend + // beyond the signed 32-bit range. To account for this we add an extended + // jump table at the bottom of the instruction stream, and if a jump + // overflows its range, it will redirect here. + // + // In our relocation table, we store two offsets instead of one: the offset + // to the original jump, and an offset to the extended jump if we will need + // to use it instead. The offsets are stored as: + // [unsigned] Unsigned offset to short jump, from the start of the code. + // [unsigned] Unsigned offset to the extended jump, from the start of + // the jump table, in units of SizeOfJumpTableEntry. + // + // The start of the relocation table contains the offset from the code + // buffer to the start of the extended jump table. + // + // Each entry in this table is a jmp [rip], followed by a ud2 to hint to the + // hardware branch predictor that there is no fallthrough, followed by the + // eight bytes containing an immediate address. This comes out to 16 bytes. + // +1 byte for opcode + // +1 byte for mod r/m + // +4 bytes for rip-relative offset (2) + // +2 bytes for ud2 instruction + // +8 bytes for 64-bit address + // + static const uint32_t SizeOfExtendedJump = 1 + 1 + 4 + 2 + 8; + static const uint32_t SizeOfJumpTableEntry = 16; + + uint32_t extendedJumpTable_; + + static JitCode* CodeFromJump(JitCode* code, uint8_t* jump); + + private: + void writeRelocation(JmpSrc src, Relocation::Kind reloc); + void addPendingJump(JmpSrc src, ImmPtr target, Relocation::Kind reloc); + + protected: + size_t addPatchableJump(JmpSrc src, Relocation::Kind reloc); + + public: + using AssemblerX86Shared::j; + using AssemblerX86Shared::jmp; + using AssemblerX86Shared::push; + using AssemblerX86Shared::pop; + using AssemblerX86Shared::vmovq; + + static uint8_t* PatchableJumpAddress(JitCode* code, size_t index); + static void PatchJumpEntry(uint8_t* entry, uint8_t* target, ReprotectCode reprotect); + + Assembler() + : extendedJumpTable_(0) + { + } + + static void TraceJumpRelocations(JSTracer* trc, JitCode* code, CompactBufferReader& reader); + + // The buffer is about to be linked, make sure any constant pools or excess + // bookkeeping has been flushed to the instruction stream. + void finish(); + + // Copy the assembly code to the given buffer, and perform any pending + // relocations relying on the target address. + void executableCopy(uint8_t* buffer); + + // Actual assembly emitting functions. + + void push(const ImmGCPtr ptr) { + movq(ptr, ScratchReg); + push(ScratchReg); + } + void push(const ImmWord ptr) { + // We often end up with ImmWords that actually fit into int32. + // Be aware of the sign extension behavior. + if (ptr.value <= INT32_MAX) { + push(Imm32(ptr.value)); + } else { + movq(ptr, ScratchReg); + push(ScratchReg); + } + } + void push(ImmPtr imm) { + push(ImmWord(uintptr_t(imm.value))); + } + void push(FloatRegister src) { + subq(Imm32(sizeof(double)), StackPointer); + vmovsd(src, Address(StackPointer, 0)); + } + CodeOffset pushWithPatch(ImmWord word) { + CodeOffset label = movWithPatch(word, ScratchReg); + push(ScratchReg); + return label; + } + + void pop(FloatRegister src) { + vmovsd(Address(StackPointer, 0), src); + addq(Imm32(sizeof(double)), StackPointer); + } + + CodeOffset movWithPatch(ImmWord word, Register dest) { + masm.movq_i64r(word.value, dest.encoding()); + return CodeOffset(masm.currentOffset()); + } + CodeOffset movWithPatch(ImmPtr imm, Register dest) { + return movWithPatch(ImmWord(uintptr_t(imm.value)), dest); + } + + // Load an ImmWord value into a register. Note that this instruction will + // attempt to optimize its immediate field size. When a full 64-bit + // immediate is needed for a relocation, use movWithPatch. + void movq(ImmWord word, Register dest) { + // Load a 64-bit immediate into a register. If the value falls into + // certain ranges, we can use specialized instructions which have + // smaller encodings. + if (word.value <= UINT32_MAX) { + // movl has a 32-bit unsigned (effectively) immediate field. + masm.movl_i32r((uint32_t)word.value, dest.encoding()); + } else if ((intptr_t)word.value >= INT32_MIN && (intptr_t)word.value <= INT32_MAX) { + // movq has a 32-bit signed immediate field. + masm.movq_i32r((int32_t)(intptr_t)word.value, dest.encoding()); + } else { + // Otherwise use movabs. + masm.movq_i64r(word.value, dest.encoding()); + } + } + void movq(ImmPtr imm, Register dest) { + movq(ImmWord(uintptr_t(imm.value)), dest); + } + void movq(ImmGCPtr ptr, Register dest) { + masm.movq_i64r(uintptr_t(ptr.value), dest.encoding()); + writeDataRelocation(ptr); + } + void movq(const Operand& src, Register dest) { + switch (src.kind()) { + case Operand::REG: + masm.movq_rr(src.reg(), dest.encoding()); + break; + case Operand::MEM_REG_DISP: + masm.movq_mr(src.disp(), src.base(), dest.encoding()); + break; + case Operand::MEM_SCALE: + masm.movq_mr(src.disp(), src.base(), src.index(), src.scale(), dest.encoding()); + break; + case Operand::MEM_ADDRESS32: + masm.movq_mr(src.address(), dest.encoding()); + break; + default: + MOZ_CRASH("unexpected operand kind"); + } + } + void movq(Register src, const Operand& dest) { + switch (dest.kind()) { + case Operand::REG: + masm.movq_rr(src.encoding(), dest.reg()); + break; + case Operand::MEM_REG_DISP: + masm.movq_rm(src.encoding(), dest.disp(), dest.base()); + break; + case Operand::MEM_SCALE: + masm.movq_rm(src.encoding(), dest.disp(), dest.base(), dest.index(), dest.scale()); + break; + case Operand::MEM_ADDRESS32: + masm.movq_rm(src.encoding(), dest.address()); + break; + default: + MOZ_CRASH("unexpected operand kind"); + } + } + void movq(Imm32 imm32, const Operand& dest) { + switch (dest.kind()) { + case Operand::REG: + masm.movl_i32r(imm32.value, dest.reg()); + break; + case Operand::MEM_REG_DISP: + masm.movq_i32m(imm32.value, dest.disp(), dest.base()); + break; + case Operand::MEM_SCALE: + masm.movq_i32m(imm32.value, dest.disp(), dest.base(), dest.index(), dest.scale()); + break; + case Operand::MEM_ADDRESS32: + masm.movq_i32m(imm32.value, dest.address()); + break; + default: + MOZ_CRASH("unexpected operand kind"); + } + } + void vmovq(Register src, FloatRegister dest) { + masm.vmovq_rr(src.encoding(), dest.encoding()); + } + void vmovq(FloatRegister src, Register dest) { + masm.vmovq_rr(src.encoding(), dest.encoding()); + } + void movq(Register src, Register dest) { + masm.movq_rr(src.encoding(), dest.encoding()); + } + + void cmovzq(const Operand& src, Register dest) { + switch (src.kind()) { + case Operand::REG: + masm.cmovzq_rr(src.reg(), dest.encoding()); + break; + case Operand::MEM_REG_DISP: + masm.cmovzq_mr(src.disp(), src.base(), dest.encoding()); + break; + case Operand::MEM_SCALE: + masm.cmovzq_mr(src.disp(), src.base(), src.index(), src.scale(), dest.encoding()); + break; + default: + MOZ_CRASH("unexpected operand kind"); + } + } + + void xchgq(Register src, Register dest) { + masm.xchgq_rr(src.encoding(), dest.encoding()); + } + + void movsbq(const Operand& src, Register dest) { + switch (src.kind()) { + case Operand::MEM_REG_DISP: + masm.movsbq_mr(src.disp(), src.base(), dest.encoding()); + break; + case Operand::MEM_SCALE: + masm.movsbq_mr(src.disp(), src.base(), src.index(), src.scale(), dest.encoding()); + break; + default: + MOZ_CRASH("unexpected operand kind"); + } + } + + void movzbq(const Operand& src, Register dest) { + // movzbl zero-extends to 64 bits and is one byte smaller, so use that + // instead. + movzbl(src, dest); + } + + void movswq(const Operand& src, Register dest) { + switch (src.kind()) { + case Operand::MEM_REG_DISP: + masm.movswq_mr(src.disp(), src.base(), dest.encoding()); + break; + case Operand::MEM_SCALE: + masm.movswq_mr(src.disp(), src.base(), src.index(), src.scale(), dest.encoding()); + break; + default: + MOZ_CRASH("unexpected operand kind"); + } + } + + void movzwq(const Operand& src, Register dest) { + // movzwl zero-extends to 64 bits and is one byte smaller, so use that + // instead. + movzwl(src, dest); + } + + void movslq(Register src, Register dest) { + masm.movslq_rr(src.encoding(), dest.encoding()); + } + void movslq(const Operand& src, Register dest) { + switch (src.kind()) { + case Operand::REG: + masm.movslq_rr(src.reg(), dest.encoding()); + break; + case Operand::MEM_REG_DISP: + masm.movslq_mr(src.disp(), src.base(), dest.encoding()); + break; + case Operand::MEM_SCALE: + masm.movslq_mr(src.disp(), src.base(), src.index(), src.scale(), dest.encoding()); + break; + default: + MOZ_CRASH("unexpected operand kind"); + } + } + + void andq(Register src, Register dest) { + masm.andq_rr(src.encoding(), dest.encoding()); + } + void andq(Imm32 imm, Register dest) { + masm.andq_ir(imm.value, dest.encoding()); + } + void andq(const Operand& src, Register dest) { + switch (src.kind()) { + case Operand::REG: + masm.andq_rr(src.reg(), dest.encoding()); + break; + case Operand::MEM_REG_DISP: + masm.andq_mr(src.disp(), src.base(), dest.encoding()); + break; + case Operand::MEM_SCALE: + masm.andq_mr(src.disp(), src.base(), src.index(), src.scale(), dest.encoding()); + break; + case Operand::MEM_ADDRESS32: + masm.andq_mr(src.address(), dest.encoding()); + break; + default: + MOZ_CRASH("unexpected operand kind"); + } + } + + void addq(Imm32 imm, Register dest) { + masm.addq_ir(imm.value, dest.encoding()); + } + void addq(Imm32 imm, const Operand& dest) { + switch (dest.kind()) { + case Operand::REG: + masm.addq_ir(imm.value, dest.reg()); + break; + case Operand::MEM_REG_DISP: + masm.addq_im(imm.value, dest.disp(), dest.base()); + break; + case Operand::MEM_ADDRESS32: + masm.addq_im(imm.value, dest.address()); + break; + default: + MOZ_CRASH("unexpected operand kind"); + } + } + void addq(Register src, Register dest) { + masm.addq_rr(src.encoding(), dest.encoding()); + } + void addq(const Operand& src, Register dest) { + switch (src.kind()) { + case Operand::REG: + masm.addq_rr(src.reg(), dest.encoding()); + break; + case Operand::MEM_REG_DISP: + masm.addq_mr(src.disp(), src.base(), dest.encoding()); + break; + case Operand::MEM_ADDRESS32: + masm.addq_mr(src.address(), dest.encoding()); + break; + default: + MOZ_CRASH("unexpected operand kind"); + } + } + + void subq(Imm32 imm, Register dest) { + masm.subq_ir(imm.value, dest.encoding()); + } + void subq(Register src, Register dest) { + masm.subq_rr(src.encoding(), dest.encoding()); + } + void subq(const Operand& src, Register dest) { + switch (src.kind()) { + case Operand::REG: + masm.subq_rr(src.reg(), dest.encoding()); + break; + case Operand::MEM_REG_DISP: + masm.subq_mr(src.disp(), src.base(), dest.encoding()); + break; + case Operand::MEM_ADDRESS32: + masm.subq_mr(src.address(), dest.encoding()); + break; + default: + MOZ_CRASH("unexpected operand kind"); + } + } + void subq(Register src, const Operand& dest) { + switch (dest.kind()) { + case Operand::REG: + masm.subq_rr(src.encoding(), dest.reg()); + break; + case Operand::MEM_REG_DISP: + masm.subq_rm(src.encoding(), dest.disp(), dest.base()); + break; + default: + MOZ_CRASH("unexpected operand kind"); + } + } + void shlq(Imm32 imm, Register dest) { + masm.shlq_ir(imm.value, dest.encoding()); + } + void shrq(Imm32 imm, Register dest) { + masm.shrq_ir(imm.value, dest.encoding()); + } + void sarq(Imm32 imm, Register dest) { + masm.sarq_ir(imm.value, dest.encoding()); + } + void shlq_cl(Register dest) { + masm.shlq_CLr(dest.encoding()); + } + void shrq_cl(Register dest) { + masm.shrq_CLr(dest.encoding()); + } + void sarq_cl(Register dest) { + masm.sarq_CLr(dest.encoding()); + } + void rolq(Imm32 imm, Register dest) { + masm.rolq_ir(imm.value, dest.encoding()); + } + void rolq_cl(Register dest) { + masm.rolq_CLr(dest.encoding()); + } + void rorq(Imm32 imm, Register dest) { + masm.rorq_ir(imm.value, dest.encoding()); + } + void rorq_cl(Register dest) { + masm.rorq_CLr(dest.encoding()); + } + void orq(Imm32 imm, Register dest) { + masm.orq_ir(imm.value, dest.encoding()); + } + void orq(Register src, Register dest) { + masm.orq_rr(src.encoding(), dest.encoding()); + } + void orq(const Operand& src, Register dest) { + switch (src.kind()) { + case Operand::REG: + masm.orq_rr(src.reg(), dest.encoding()); + break; + case Operand::MEM_REG_DISP: + masm.orq_mr(src.disp(), src.base(), dest.encoding()); + break; + case Operand::MEM_ADDRESS32: + masm.orq_mr(src.address(), dest.encoding()); + break; + default: + MOZ_CRASH("unexpected operand kind"); + } + } + void xorq(Register src, Register dest) { + masm.xorq_rr(src.encoding(), dest.encoding()); + } + void xorq(Imm32 imm, Register dest) { + masm.xorq_ir(imm.value, dest.encoding()); + } + void xorq(const Operand& src, Register dest) { + switch (src.kind()) { + case Operand::REG: + masm.xorq_rr(src.reg(), dest.encoding()); + break; + case Operand::MEM_REG_DISP: + masm.xorq_mr(src.disp(), src.base(), dest.encoding()); + break; + case Operand::MEM_ADDRESS32: + masm.xorq_mr(src.address(), dest.encoding()); + break; + default: + MOZ_CRASH("unexpected operand kind"); + } + } + + void bsrq(const Register& src, const Register& dest) { + masm.bsrq_rr(src.encoding(), dest.encoding()); + } + void bsfq(const Register& src, const Register& dest) { + masm.bsfq_rr(src.encoding(), dest.encoding()); + } + void popcntq(const Register& src, const Register& dest) { + masm.popcntq_rr(src.encoding(), dest.encoding()); + } + + void imulq(Register src, Register dest) { + masm.imulq_rr(src.encoding(), dest.encoding()); + } + void imulq(const Operand& src, Register dest) { + switch (src.kind()) { + case Operand::REG: + masm.imulq_rr(src.reg(), dest.encoding()); + break; + case Operand::MEM_REG_DISP: + masm.imulq_mr(src.disp(), src.base(), dest.encoding()); + break; + case Operand::MEM_ADDRESS32: + MOZ_CRASH("NYI"); + break; + default: + MOZ_CRASH("unexpected operand kind"); + } + } + + void cqo() { + masm.cqo(); + } + void idivq(Register divisor) { + masm.idivq_r(divisor.encoding()); + } + void udivq(Register divisor) { + masm.divq_r(divisor.encoding()); + } + + void vcvtsi2sdq(Register src, FloatRegister dest) { + masm.vcvtsi2sdq_rr(src.encoding(), dest.encoding()); + } + + void negq(Register reg) { + masm.negq_r(reg.encoding()); + } + + void mov(ImmWord word, Register dest) { + // Use xor for setting registers to zero, as it is specially optimized + // for this purpose on modern hardware. Note that it does clobber FLAGS + // though. Use xorl instead of xorq since they are functionally + // equivalent (32-bit instructions zero-extend their results to 64 bits) + // and xorl has a smaller encoding. + if (word.value == 0) + xorl(dest, dest); + else + movq(word, dest); + } + void mov(ImmPtr imm, Register dest) { + movq(imm, dest); + } + void mov(wasm::SymbolicAddress imm, Register dest) { + masm.movq_i64r(-1, dest.encoding()); + append(wasm::SymbolicAccess(CodeOffset(masm.currentOffset()), imm)); + } + void mov(const Operand& src, Register dest) { + movq(src, dest); + } + void mov(Register src, const Operand& dest) { + movq(src, dest); + } + void mov(Imm32 imm32, const Operand& dest) { + movq(imm32, dest); + } + void mov(Register src, Register dest) { + movq(src, dest); + } + void mov(CodeOffset* label, Register dest) { + masm.movq_i64r(/* placeholder */ 0, dest.encoding()); + label->bind(masm.size()); + } + void xchg(Register src, Register dest) { + xchgq(src, dest); + } + void lea(const Operand& src, Register dest) { + switch (src.kind()) { + case Operand::MEM_REG_DISP: + masm.leaq_mr(src.disp(), src.base(), dest.encoding()); + break; + case Operand::MEM_SCALE: + masm.leaq_mr(src.disp(), src.base(), src.index(), src.scale(), dest.encoding()); + break; + default: + MOZ_CRASH("unexepcted operand kind"); + } + } + + CodeOffset loadRipRelativeInt32(Register dest) { + return CodeOffset(masm.movl_ripr(dest.encoding()).offset()); + } + CodeOffset loadRipRelativeInt64(Register dest) { + return CodeOffset(masm.movq_ripr(dest.encoding()).offset()); + } + CodeOffset loadRipRelativeDouble(FloatRegister dest) { + return CodeOffset(masm.vmovsd_ripr(dest.encoding()).offset()); + } + CodeOffset loadRipRelativeFloat32(FloatRegister dest) { + return CodeOffset(masm.vmovss_ripr(dest.encoding()).offset()); + } + CodeOffset loadRipRelativeInt32x4(FloatRegister dest) { + return CodeOffset(masm.vmovdqa_ripr(dest.encoding()).offset()); + } + CodeOffset loadRipRelativeFloat32x4(FloatRegister dest) { + return CodeOffset(masm.vmovaps_ripr(dest.encoding()).offset()); + } + CodeOffset storeRipRelativeInt32(Register dest) { + return CodeOffset(masm.movl_rrip(dest.encoding()).offset()); + } + CodeOffset storeRipRelativeInt64(Register dest) { + return CodeOffset(masm.movq_rrip(dest.encoding()).offset()); + } + CodeOffset storeRipRelativeDouble(FloatRegister dest) { + return CodeOffset(masm.vmovsd_rrip(dest.encoding()).offset()); + } + CodeOffset storeRipRelativeFloat32(FloatRegister dest) { + return CodeOffset(masm.vmovss_rrip(dest.encoding()).offset()); + } + CodeOffset storeRipRelativeInt32x4(FloatRegister dest) { + return CodeOffset(masm.vmovdqa_rrip(dest.encoding()).offset()); + } + CodeOffset storeRipRelativeFloat32x4(FloatRegister dest) { + return CodeOffset(masm.vmovaps_rrip(dest.encoding()).offset()); + } + CodeOffset leaRipRelative(Register dest) { + return CodeOffset(masm.leaq_rip(dest.encoding()).offset()); + } + + void cmpq(Register rhs, Register lhs) { + masm.cmpq_rr(rhs.encoding(), lhs.encoding()); + } + void cmpq(Register rhs, const Operand& lhs) { + switch (lhs.kind()) { + case Operand::REG: + masm.cmpq_rr(rhs.encoding(), lhs.reg()); + break; + case Operand::MEM_REG_DISP: + masm.cmpq_rm(rhs.encoding(), lhs.disp(), lhs.base()); + break; + case Operand::MEM_ADDRESS32: + masm.cmpq_rm(rhs.encoding(), lhs.address()); + break; + default: + MOZ_CRASH("unexpected operand kind"); + } + } + void cmpq(Imm32 rhs, Register lhs) { + masm.cmpq_ir(rhs.value, lhs.encoding()); + } + void cmpq(Imm32 rhs, const Operand& lhs) { + switch (lhs.kind()) { + case Operand::REG: + masm.cmpq_ir(rhs.value, lhs.reg()); + break; + case Operand::MEM_REG_DISP: + masm.cmpq_im(rhs.value, lhs.disp(), lhs.base()); + break; + case Operand::MEM_ADDRESS32: + masm.cmpq_im(rhs.value, lhs.address()); + break; + default: + MOZ_CRASH("unexpected operand kind"); + } + } + void cmpq(const Operand& rhs, Register lhs) { + switch (rhs.kind()) { + case Operand::REG: + masm.cmpq_rr(rhs.reg(), lhs.encoding()); + break; + case Operand::MEM_REG_DISP: + masm.cmpq_mr(rhs.disp(), rhs.base(), lhs.encoding()); + break; + default: + MOZ_CRASH("unexpected operand kind"); + } + } + + void testq(Imm32 rhs, Register lhs) { + masm.testq_ir(rhs.value, lhs.encoding()); + } + void testq(Register rhs, Register lhs) { + masm.testq_rr(rhs.encoding(), lhs.encoding()); + } + void testq(Imm32 rhs, const Operand& lhs) { + switch (lhs.kind()) { + case Operand::REG: + masm.testq_ir(rhs.value, lhs.reg()); + break; + case Operand::MEM_REG_DISP: + masm.testq_i32m(rhs.value, lhs.disp(), lhs.base()); + break; + default: + MOZ_CRASH("unexpected operand kind"); + break; + } + } + + void jmp(ImmPtr target, Relocation::Kind reloc = Relocation::HARDCODED) { + JmpSrc src = masm.jmp(); + addPendingJump(src, target, reloc); + } + void j(Condition cond, ImmPtr target, + Relocation::Kind reloc = Relocation::HARDCODED) { + JmpSrc src = masm.jCC(static_cast<X86Encoding::Condition>(cond)); + addPendingJump(src, target, reloc); + } + + void jmp(JitCode* target) { + jmp(ImmPtr(target->raw()), Relocation::JITCODE); + } + void j(Condition cond, JitCode* target) { + j(cond, ImmPtr(target->raw()), Relocation::JITCODE); + } + void call(JitCode* target) { + JmpSrc src = masm.call(); + addPendingJump(src, ImmPtr(target->raw()), Relocation::JITCODE); + } + void call(ImmWord target) { + call(ImmPtr((void*)target.value)); + } + void call(ImmPtr target) { + JmpSrc src = masm.call(); + addPendingJump(src, target, Relocation::HARDCODED); + } + + // Emit a CALL or CMP (nop) instruction. ToggleCall can be used to patch + // this instruction. + CodeOffset toggledCall(JitCode* target, bool enabled) { + CodeOffset offset(size()); + JmpSrc src = enabled ? masm.call() : masm.cmp_eax(); + addPendingJump(src, ImmPtr(target->raw()), Relocation::JITCODE); + MOZ_ASSERT_IF(!oom(), size() - offset.offset() == ToggledCallSize(nullptr)); + return offset; + } + + static size_t ToggledCallSize(uint8_t* code) { + // Size of a call instruction. + return 5; + } + + // Do not mask shared implementations. + using AssemblerX86Shared::call; + + void vcvttsd2sq(FloatRegister src, Register dest) { + masm.vcvttsd2sq_rr(src.encoding(), dest.encoding()); + } + void vcvttss2sq(FloatRegister src, Register dest) { + masm.vcvttss2sq_rr(src.encoding(), dest.encoding()); + } + void vcvtsq2sd(Register src1, FloatRegister src0, FloatRegister dest) { + masm.vcvtsq2sd_rr(src1.encoding(), src0.encoding(), dest.encoding()); + } + void vcvtsq2ss(Register src1, FloatRegister src0, FloatRegister dest) { + masm.vcvtsq2ss_rr(src1.encoding(), src0.encoding(), dest.encoding()); + } +}; + +static inline void +PatchJump(CodeLocationJump jump, CodeLocationLabel label, ReprotectCode reprotect = DontReprotect) +{ + if (X86Encoding::CanRelinkJump(jump.raw(), label.raw())) { + MaybeAutoWritableJitCode awjc(jump.raw() - 8, 8, reprotect); + X86Encoding::SetRel32(jump.raw(), label.raw()); + } else { + { + MaybeAutoWritableJitCode awjc(jump.raw() - 8, 8, reprotect); + X86Encoding::SetRel32(jump.raw(), jump.jumpTableEntry()); + } + Assembler::PatchJumpEntry(jump.jumpTableEntry(), label.raw(), reprotect); + } +} + +static inline void +PatchBackedge(CodeLocationJump& jump_, CodeLocationLabel label, JitRuntime::BackedgeTarget target) +{ + PatchJump(jump_, label); +} + +static inline bool +GetIntArgReg(uint32_t intArg, uint32_t floatArg, Register* out) +{ +#if defined(_WIN64) + uint32_t arg = intArg + floatArg; +#else + uint32_t arg = intArg; +#endif + if (arg >= NumIntArgRegs) + return false; + *out = IntArgRegs[arg]; + return true; +} + +// Get a register in which we plan to put a quantity that will be used as an +// integer argument. This differs from GetIntArgReg in that if we have no more +// actual argument registers to use we will fall back on using whatever +// CallTempReg* don't overlap the argument registers, and only fail once those +// run out too. +static inline bool +GetTempRegForIntArg(uint32_t usedIntArgs, uint32_t usedFloatArgs, Register* out) +{ + if (GetIntArgReg(usedIntArgs, usedFloatArgs, out)) + return true; + // Unfortunately, we have to assume things about the point at which + // GetIntArgReg returns false, because we need to know how many registers it + // can allocate. +#if defined(_WIN64) + uint32_t arg = usedIntArgs + usedFloatArgs; +#else + uint32_t arg = usedIntArgs; +#endif + arg -= NumIntArgRegs; + if (arg >= NumCallTempNonArgRegs) + return false; + *out = CallTempNonArgRegs[arg]; + return true; +} + +static inline bool +GetFloatArgReg(uint32_t intArg, uint32_t floatArg, FloatRegister* out) +{ +#if defined(_WIN64) + uint32_t arg = intArg + floatArg; +#else + uint32_t arg = floatArg; +#endif + if (floatArg >= NumFloatArgRegs) + return false; + *out = FloatArgRegs[arg]; + return true; +} + +} // namespace jit +} // namespace js + +#endif /* jit_x64_Assembler_x64_h */ |