diff options
Diffstat (limited to 'js/src/jit/mips32/MacroAssembler-mips32.cpp')
| -rw-r--r-- | js/src/jit/mips32/MacroAssembler-mips32.cpp | 2787 |
1 files changed, 2787 insertions, 0 deletions
diff --git a/js/src/jit/mips32/MacroAssembler-mips32.cpp b/js/src/jit/mips32/MacroAssembler-mips32.cpp new file mode 100644 index 0000000000..6a07fff2c1 --- /dev/null +++ b/js/src/jit/mips32/MacroAssembler-mips32.cpp @@ -0,0 +1,2787 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- + * vim: set ts=8 sts=2 et sw=2 tw=80: + * 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/. */ + +#include "jit/mips32/MacroAssembler-mips32.h" + +#include "mozilla/DebugOnly.h" +#include "mozilla/EndianUtils.h" +#include "mozilla/MathAlgorithms.h" + +#include "jit/Bailouts.h" +#include "jit/BaselineFrame.h" +#include "jit/JitFrames.h" +#include "jit/JitRuntime.h" +#include "jit/MacroAssembler.h" +#include "jit/mips32/Simulator-mips32.h" +#include "jit/MoveEmitter.h" +#include "jit/SharedICRegisters.h" +#include "util/Memory.h" +#include "vm/JitActivation.h" // js::jit::JitActivation +#include "vm/JSContext.h" + +#include "jit/MacroAssembler-inl.h" + +using namespace js; +using namespace jit; + +using mozilla::Abs; + +static const int32_t PAYLOAD_OFFSET = NUNBOX32_PAYLOAD_OFFSET; +static const int32_t TAG_OFFSET = NUNBOX32_TYPE_OFFSET; + +static_assert(sizeof(intptr_t) == 4, "Not 64-bit clean."); + +void MacroAssemblerMIPSCompat::convertBoolToInt32(Register src, Register dest) { + // Note that C++ bool is only 1 byte, so zero extend it to clear the + // higher-order bits. + ma_and(dest, src, Imm32(0xff)); +} + +void MacroAssemblerMIPSCompat::convertInt32ToDouble(Register src, + FloatRegister dest) { + as_mtc1(src, dest); + as_cvtdw(dest, dest); +} + +void MacroAssemblerMIPSCompat::convertInt32ToDouble(const Address& src, + FloatRegister dest) { + ma_ls(dest, src); + as_cvtdw(dest, dest); +} + +void MacroAssemblerMIPSCompat::convertInt32ToDouble(const BaseIndex& src, + FloatRegister dest) { + computeScaledAddress(src, ScratchRegister); + convertInt32ToDouble(Address(ScratchRegister, src.offset), dest); +} + +void MacroAssemblerMIPSCompat::convertUInt32ToDouble(Register src, + FloatRegister dest) { + Label positive, done; + ma_b(src, src, &positive, NotSigned, ShortJump); + + const uint32_t kExponentShift = + mozilla::FloatingPoint<double>::kExponentShift - 32; + const uint32_t kExponent = + (31 + mozilla::FloatingPoint<double>::kExponentBias); + + ma_ext(SecondScratchReg, src, 31 - kExponentShift, kExponentShift); + ma_li(ScratchRegister, Imm32(kExponent << kExponentShift)); + ma_or(SecondScratchReg, ScratchRegister); + ma_sll(ScratchRegister, src, Imm32(kExponentShift + 1)); + moveToDoubleHi(SecondScratchReg, dest); + moveToDoubleLo(ScratchRegister, dest); + + ma_b(&done, ShortJump); + + bind(&positive); + convertInt32ToDouble(src, dest); + + bind(&done); +} + +void MacroAssemblerMIPSCompat::convertUInt32ToFloat32(Register src, + FloatRegister dest) { + Label positive, done; + ma_b(src, src, &positive, NotSigned, ShortJump); + + const uint32_t kExponentShift = + mozilla::FloatingPoint<double>::kExponentShift - 32; + const uint32_t kExponent = + (31 + mozilla::FloatingPoint<double>::kExponentBias); + + ma_ext(SecondScratchReg, src, 31 - kExponentShift, kExponentShift); + ma_li(ScratchRegister, Imm32(kExponent << kExponentShift)); + ma_or(SecondScratchReg, ScratchRegister); + ma_sll(ScratchRegister, src, Imm32(kExponentShift + 1)); + FloatRegister destDouble = dest.asDouble(); + moveToDoubleHi(SecondScratchReg, destDouble); + moveToDoubleLo(ScratchRegister, destDouble); + + convertDoubleToFloat32(destDouble, dest); + + ma_b(&done, ShortJump); + + bind(&positive); + convertInt32ToFloat32(src, dest); + + bind(&done); +} + +void MacroAssemblerMIPSCompat::convertDoubleToFloat32(FloatRegister src, + FloatRegister dest) { + as_cvtsd(dest, src); +} + +const int CauseBitPos = int(Assembler::CauseI); +const int CauseBitCount = 1 + int(Assembler::CauseV) - int(Assembler::CauseI); +const int CauseIOrVMask = ((1 << int(Assembler::CauseI)) | + (1 << int(Assembler::CauseV))) >> + int(Assembler::CauseI); + +// Checks whether a double is representable as a 32-bit integer. If so, the +// integer is written to the output register. Otherwise, a bailout is taken to +// the given snapshot. This function overwrites the scratch float register. +void MacroAssemblerMIPSCompat::convertDoubleToInt32(FloatRegister src, + Register dest, Label* fail, + bool negativeZeroCheck) { + if (negativeZeroCheck) { + moveFromDoubleHi(src, dest); + moveFromDoubleLo(src, SecondScratchReg); + ma_xor(dest, Imm32(INT32_MIN)); + ma_or(dest, SecondScratchReg); + ma_b(dest, Imm32(0), fail, Assembler::Equal); + } + + // Truncate double to int ; if result is inexact or invalid fail. + as_truncwd(ScratchFloat32Reg, src); + as_cfc1(ScratchRegister, Assembler::FCSR); + moveFromFloat32(ScratchFloat32Reg, dest); + ma_ext(ScratchRegister, ScratchRegister, CauseBitPos, CauseBitCount); + // Here adding the masking andi instruction just for a precaution. + // For the instruction of trunc.*.*, the Floating Point Exceptions can be + // only Inexact, Invalid Operation, Unimplemented Operation. + // Leaving it maybe is also ok. + as_andi(ScratchRegister, ScratchRegister, CauseIOrVMask); + ma_b(ScratchRegister, Imm32(0), fail, Assembler::NotEqual); +} + +// Checks whether a float32 is representable as a 32-bit integer. If so, the +// integer is written to the output register. Otherwise, a bailout is taken to +// the given snapshot. This function overwrites the scratch float register. +void MacroAssemblerMIPSCompat::convertFloat32ToInt32(FloatRegister src, + Register dest, Label* fail, + bool negativeZeroCheck) { + if (negativeZeroCheck) { + moveFromFloat32(src, dest); + ma_b(dest, Imm32(INT32_MIN), fail, Assembler::Equal); + } + + as_truncws(ScratchFloat32Reg, src); + as_cfc1(ScratchRegister, Assembler::FCSR); + moveFromFloat32(ScratchFloat32Reg, dest); + ma_ext(ScratchRegister, ScratchRegister, CauseBitPos, CauseBitCount); + as_andi(ScratchRegister, ScratchRegister, CauseIOrVMask); + ma_b(ScratchRegister, Imm32(0), fail, Assembler::NotEqual); +} + +void MacroAssemblerMIPSCompat::convertFloat32ToDouble(FloatRegister src, + FloatRegister dest) { + as_cvtds(dest, src); +} + +void MacroAssemblerMIPSCompat::convertInt32ToFloat32(Register src, + FloatRegister dest) { + as_mtc1(src, dest); + as_cvtsw(dest, dest); +} + +void MacroAssemblerMIPSCompat::convertInt32ToFloat32(const Address& src, + FloatRegister dest) { + ma_ls(dest, src); + as_cvtsw(dest, dest); +} + +void MacroAssemblerMIPS::ma_li(Register dest, CodeLabel* label) { + BufferOffset bo = m_buffer.nextOffset(); + ma_liPatchable(dest, ImmWord(/* placeholder */ 0)); + label->patchAt()->bind(bo.getOffset()); + label->setLinkMode(CodeLabel::MoveImmediate); +} + +void MacroAssemblerMIPS::ma_li(Register dest, ImmWord imm) { + ma_li(dest, Imm32(uint32_t(imm.value))); +} + +void MacroAssemblerMIPS::ma_liPatchable(Register dest, ImmPtr imm) { + ma_liPatchable(dest, ImmWord(uintptr_t(imm.value))); +} + +void MacroAssemblerMIPS::ma_liPatchable(Register dest, ImmWord imm) { + ma_liPatchable(dest, Imm32(int32_t(imm.value))); +} + +// Arithmetic-based ops. + +// Add. +void MacroAssemblerMIPS::ma_addTestOverflow(Register rd, Register rs, + Register rt, Label* overflow) { + MOZ_ASSERT_IF(rs == rd, rs != rt); + MOZ_ASSERT(rs != ScratchRegister); + MOZ_ASSERT(rt != ScratchRegister); + MOZ_ASSERT(rd != rt); + MOZ_ASSERT(rd != ScratchRegister); + MOZ_ASSERT(rd != SecondScratchReg); + + if (rs == rt) { + as_addu(rd, rs, rs); + as_xor(SecondScratchReg, rs, rd); + ma_b(SecondScratchReg, Imm32(0), overflow, Assembler::LessThan); + return; + } + + // If different sign, no overflow + as_xor(ScratchRegister, rs, rt); + + as_addu(rd, rs, rt); + as_nor(ScratchRegister, ScratchRegister, zero); + // If different sign, then overflow + as_xor(SecondScratchReg, rt, rd); + as_and(SecondScratchReg, SecondScratchReg, ScratchRegister); + ma_b(SecondScratchReg, Imm32(0), overflow, Assembler::LessThan); +} + +void MacroAssemblerMIPS::ma_addTestOverflow(Register rd, Register rs, Imm32 imm, + Label* overflow) { + MOZ_ASSERT(rs != ScratchRegister); + MOZ_ASSERT(rs != SecondScratchReg); + MOZ_ASSERT(rd != ScratchRegister); + MOZ_ASSERT(rd != SecondScratchReg); + + Register rs_copy = rs; + + if (imm.value > 0) { + as_nor(ScratchRegister, rs, zero); + } else if (rs == rd) { + ma_move(ScratchRegister, rs); + rs_copy = ScratchRegister; + } + + if (Imm16::IsInSignedRange(imm.value)) { + as_addiu(rd, rs, imm.value); + } else { + ma_li(SecondScratchReg, imm); + as_addu(rd, rs, SecondScratchReg); + } + + if (imm.value > 0) { + as_and(ScratchRegister, ScratchRegister, rd); + } else { + as_nor(SecondScratchReg, rd, zero); + as_and(ScratchRegister, rs_copy, SecondScratchReg); + } + + ma_b(ScratchRegister, Imm32(0), overflow, Assembler::LessThan); +} + +// Subtract. +void MacroAssemblerMIPS::ma_subTestOverflow(Register rd, Register rs, + Register rt, Label* overflow) { + // The rs == rt case should probably be folded at MIR stage. + // Happens for Number_isInteger*. Not worth specializing here. + MOZ_ASSERT_IF(rs == rd, rs != rt); + MOZ_ASSERT(rs != SecondScratchReg); + MOZ_ASSERT(rt != SecondScratchReg); + MOZ_ASSERT(rd != rt); + MOZ_ASSERT(rd != ScratchRegister); + MOZ_ASSERT(rd != SecondScratchReg); + + Register rs_copy = rs; + + if (rs == rd) { + ma_move(SecondScratchReg, rs); + rs_copy = SecondScratchReg; + } + + as_subu(rd, rs, rt); + // If same sign, no overflow + as_xor(ScratchRegister, rs_copy, rt); + // If different sign, then overflow + as_xor(SecondScratchReg, rs_copy, rd); + as_and(SecondScratchReg, SecondScratchReg, ScratchRegister); + ma_b(SecondScratchReg, Imm32(0), overflow, Assembler::LessThan); +} + +// Memory. + +void MacroAssemblerMIPS::ma_load(Register dest, Address address, + LoadStoreSize size, + LoadStoreExtension extension) { + int16_t encodedOffset; + Register base; + + if (isLoongson() && ZeroExtend != extension && + !Imm16::IsInSignedRange(address.offset)) { + ma_li(ScratchRegister, Imm32(address.offset)); + base = address.base; + + switch (size) { + case SizeByte: + as_gslbx(dest, base, ScratchRegister, 0); + break; + case SizeHalfWord: + as_gslhx(dest, base, ScratchRegister, 0); + break; + case SizeWord: + as_gslwx(dest, base, ScratchRegister, 0); + break; + case SizeDouble: + as_gsldx(dest, base, ScratchRegister, 0); + break; + default: + MOZ_CRASH("Invalid argument for ma_load"); + } + return; + } + + if (!Imm16::IsInSignedRange(address.offset)) { + ma_li(ScratchRegister, Imm32(address.offset)); + as_addu(ScratchRegister, address.base, ScratchRegister); + base = ScratchRegister; + encodedOffset = Imm16(0).encode(); + } else { + encodedOffset = Imm16(address.offset).encode(); + base = address.base; + } + + switch (size) { + case SizeByte: + if (ZeroExtend == extension) { + as_lbu(dest, base, encodedOffset); + } else { + as_lb(dest, base, encodedOffset); + } + break; + case SizeHalfWord: + if (ZeroExtend == extension) { + as_lhu(dest, base, encodedOffset); + } else { + as_lh(dest, base, encodedOffset); + } + break; + case SizeWord: + as_lw(dest, base, encodedOffset); + break; + default: + MOZ_CRASH("Invalid argument for ma_load"); + } +} + +void MacroAssemblerMIPS::ma_store(Register data, Address address, + LoadStoreSize size, + LoadStoreExtension extension) { + int16_t encodedOffset; + Register base; + + if (isLoongson() && !Imm16::IsInSignedRange(address.offset)) { + ma_li(ScratchRegister, Imm32(address.offset)); + base = address.base; + + switch (size) { + case SizeByte: + as_gssbx(data, base, ScratchRegister, 0); + break; + case SizeHalfWord: + as_gsshx(data, base, ScratchRegister, 0); + break; + case SizeWord: + as_gsswx(data, base, ScratchRegister, 0); + break; + case SizeDouble: + as_gssdx(data, base, ScratchRegister, 0); + break; + default: + MOZ_CRASH("Invalid argument for ma_store"); + } + return; + } + + if (!Imm16::IsInSignedRange(address.offset)) { + ma_li(ScratchRegister, Imm32(address.offset)); + as_addu(ScratchRegister, address.base, ScratchRegister); + base = ScratchRegister; + encodedOffset = Imm16(0).encode(); + } else { + encodedOffset = Imm16(address.offset).encode(); + base = address.base; + } + + switch (size) { + case SizeByte: + as_sb(data, base, encodedOffset); + break; + case SizeHalfWord: + as_sh(data, base, encodedOffset); + break; + case SizeWord: + as_sw(data, base, encodedOffset); + break; + default: + MOZ_CRASH("Invalid argument for ma_store"); + } +} + +void MacroAssemblerMIPSCompat::computeScaledAddress(const BaseIndex& address, + Register dest) { + int32_t shift = Imm32::ShiftOf(address.scale).value; + if (shift) { + ma_sll(ScratchRegister, address.index, Imm32(shift)); + as_addu(dest, address.base, ScratchRegister); + } else { + as_addu(dest, address.base, address.index); + } +} + +// Shortcut for when we know we're transferring 32 bits of data. +void MacroAssemblerMIPS::ma_lw(Register data, Address address) { + ma_load(data, address, SizeWord); +} + +void MacroAssemblerMIPS::ma_sw(Register data, Address address) { + ma_store(data, address, SizeWord); +} + +void MacroAssemblerMIPS::ma_sw(Imm32 imm, Address address) { + MOZ_ASSERT(address.base != ScratchRegister); + ma_li(ScratchRegister, imm); + + if (Imm16::IsInSignedRange(address.offset)) { + as_sw(ScratchRegister, address.base, address.offset); + } else { + MOZ_ASSERT(address.base != SecondScratchReg); + + ma_li(SecondScratchReg, Imm32(address.offset)); + as_addu(SecondScratchReg, address.base, SecondScratchReg); + as_sw(ScratchRegister, SecondScratchReg, 0); + } +} + +void MacroAssemblerMIPS::ma_sw(Register data, BaseIndex& address) { + ma_store(data, address, SizeWord); +} + +void MacroAssemblerMIPS::ma_pop(Register r) { + as_lw(r, StackPointer, 0); + as_addiu(StackPointer, StackPointer, sizeof(intptr_t)); +} + +void MacroAssemblerMIPS::ma_push(Register r) { + if (r == sp) { + // Pushing sp requires one more instruction. + ma_move(ScratchRegister, sp); + r = ScratchRegister; + } + + as_addiu(StackPointer, StackPointer, -sizeof(intptr_t)); + as_sw(r, StackPointer, 0); +} + +// Branches when done from within mips-specific code. +void MacroAssemblerMIPS::ma_b(Register lhs, Address addr, Label* label, + Condition c, JumpKind jumpKind) { + MOZ_ASSERT(lhs != ScratchRegister); + ma_lw(ScratchRegister, addr); + ma_b(lhs, ScratchRegister, label, c, jumpKind); +} + +void MacroAssemblerMIPS::ma_b(Address addr, Imm32 imm, Label* label, + Condition c, JumpKind jumpKind) { + ma_lw(SecondScratchReg, addr); + ma_b(SecondScratchReg, imm, label, c, jumpKind); +} + +void MacroAssemblerMIPS::ma_b(Address addr, ImmGCPtr imm, Label* label, + Condition c, JumpKind jumpKind) { + ma_lw(SecondScratchReg, addr); + ma_b(SecondScratchReg, imm, label, c, jumpKind); +} + +void MacroAssemblerMIPS::ma_bal(Label* label, DelaySlotFill delaySlotFill) { + spew("branch .Llabel %p\n", label); + if (label->bound()) { + // Generate the long jump for calls because return address has to be + // the address after the reserved block. + addLongJump(nextOffset(), BufferOffset(label->offset())); + ma_liPatchable(ScratchRegister, Imm32(LabelBase::INVALID_OFFSET)); + as_jalr(ScratchRegister); + if (delaySlotFill == FillDelaySlot) { + as_nop(); + } + return; + } + + // Second word holds a pointer to the next branch in label's chain. + uint32_t nextInChain = + label->used() ? label->offset() : LabelBase::INVALID_OFFSET; + + // Make the whole branch continous in the buffer. + m_buffer.ensureSpace(4 * sizeof(uint32_t)); + + spew("bal .Llabel %p\n", label); + BufferOffset bo = writeInst(getBranchCode(BranchIsCall).encode()); + writeInst(nextInChain); + if (!oom()) { + label->use(bo.getOffset()); + } + // Leave space for long jump. + as_nop(); + if (delaySlotFill == FillDelaySlot) { + as_nop(); + } +} + +void MacroAssemblerMIPS::branchWithCode(InstImm code, Label* label, + JumpKind jumpKind) { + spew("branch .Llabel %p", label); + MOZ_ASSERT(code.encode() != + InstImm(op_regimm, zero, rt_bgezal, BOffImm16(0)).encode()); + InstImm inst_beq = InstImm(op_beq, zero, zero, BOffImm16(0)); + + if (label->bound()) { + int32_t offset = label->offset() - m_buffer.nextOffset().getOffset(); + + if (BOffImm16::IsInRange(offset)) { + jumpKind = ShortJump; + } + + if (jumpKind == ShortJump) { + MOZ_ASSERT(BOffImm16::IsInRange(offset)); + code.setBOffImm16(BOffImm16(offset)); +#ifdef JS_JITSPEW + decodeBranchInstAndSpew(code); +#endif + writeInst(code.encode()); + as_nop(); + return; + } + + if (code.encode() == inst_beq.encode()) { + // Handle long jump + addLongJump(nextOffset(), BufferOffset(label->offset())); + ma_liPatchable(ScratchRegister, Imm32(LabelBase::INVALID_OFFSET)); + as_jr(ScratchRegister); + as_nop(); + return; + } + + // Handle long conditional branch + spew("invert branch .Llabel %p", label); + InstImm code_r = invertBranch(code, BOffImm16(5 * sizeof(uint32_t))); +#ifdef JS_JITSPEW + decodeBranchInstAndSpew(code_r); +#endif + writeInst(code_r.encode()); + + // No need for a "nop" here because we can clobber scratch. + addLongJump(nextOffset(), BufferOffset(label->offset())); + ma_liPatchable(ScratchRegister, Imm32(LabelBase::INVALID_OFFSET)); + as_jr(ScratchRegister); + as_nop(); + return; + } + + // Generate open jump and link it to a label. + + // Second word holds a pointer to the next branch in label's chain. + uint32_t nextInChain = + label->used() ? label->offset() : LabelBase::INVALID_OFFSET; + + if (jumpKind == ShortJump) { + // Make the whole branch continous in the buffer. + m_buffer.ensureSpace(2 * sizeof(uint32_t)); + + // Indicate that this is short jump with offset 4. + code.setBOffImm16(BOffImm16(4)); +#ifdef JS_JITSPEW + decodeBranchInstAndSpew(code); +#endif + BufferOffset bo = writeInst(code.encode()); + writeInst(nextInChain); + if (!oom()) { + label->use(bo.getOffset()); + } + return; + } + + bool conditional = code.encode() != inst_beq.encode(); + + // Make the whole branch continous in the buffer. + m_buffer.ensureSpace((conditional ? 5 : 4) * sizeof(uint32_t)); + +#ifdef JS_JITSPEW + decodeBranchInstAndSpew(code); +#endif + BufferOffset bo = writeInst(code.encode()); + writeInst(nextInChain); + if (!oom()) { + label->use(bo.getOffset()); + } + // Leave space for potential long jump. + as_nop(); + as_nop(); + if (conditional) { + as_nop(); + } +} + +void MacroAssemblerMIPSCompat::cmp64Set(Condition cond, Register64 lhs, + Imm64 val, Register dest) { + if (val.value == 0) { + switch (cond) { + case Assembler::Equal: + case Assembler::BelowOrEqual: + as_or(dest, lhs.high, lhs.low); + as_sltiu(dest, dest, 1); + break; + case Assembler::NotEqual: + case Assembler::Above: + as_or(dest, lhs.high, lhs.low); + as_sltu(dest, zero, dest); + break; + case Assembler::LessThan: + case Assembler::GreaterThanOrEqual: + as_slt(dest, lhs.high, zero); + if (cond == Assembler::GreaterThanOrEqual) { + as_xori(dest, dest, 1); + } + break; + case Assembler::GreaterThan: + case Assembler::LessThanOrEqual: + as_or(SecondScratchReg, lhs.high, lhs.low); + as_sra(ScratchRegister, lhs.high, 31); + as_sltu(dest, ScratchRegister, SecondScratchReg); + if (cond == Assembler::LessThanOrEqual) { + as_xori(dest, dest, 1); + } + break; + case Assembler::Below: + case Assembler::AboveOrEqual: + as_ori(dest, zero, cond == Assembler::AboveOrEqual ? 1 : 0); + break; + default: + MOZ_CRASH("Condition code not supported"); + break; + } + return; + } + + Condition c = ma_cmp64(cond, lhs, val, dest); + + switch (cond) { + // For Equal/NotEqual cond ma_cmp64 dest holds non boolean result. + case Assembler::Equal: + as_sltiu(dest, dest, 1); + break; + case Assembler::NotEqual: + as_sltu(dest, zero, dest); + break; + default: + if (c == Assembler::Zero) as_xori(dest, dest, 1); + break; + } +} + +void MacroAssemblerMIPSCompat::cmp64Set(Condition cond, Register64 lhs, + Register64 rhs, Register dest) { + Condition c = ma_cmp64(cond, lhs, rhs, dest); + + switch (cond) { + // For Equal/NotEqual cond ma_cmp64 dest holds non boolean result. + case Assembler::Equal: + as_sltiu(dest, dest, 1); + break; + case Assembler::NotEqual: + as_sltu(dest, zero, dest); + break; + default: + if (c == Assembler::Zero) as_xori(dest, dest, 1); + break; + } +} + +Assembler::Condition MacroAssemblerMIPSCompat::ma_cmp64(Condition cond, + Register64 lhs, + Register64 rhs, + Register dest) { + switch (cond) { + case Assembler::Equal: + case Assembler::NotEqual: + as_xor(SecondScratchReg, lhs.high, rhs.high); + as_xor(ScratchRegister, lhs.low, rhs.low); + as_or(dest, SecondScratchReg, ScratchRegister); + return (cond == Assembler::Equal) ? Assembler::Zero : Assembler::NonZero; + break; + case Assembler::LessThan: + case Assembler::GreaterThanOrEqual: + as_slt(SecondScratchReg, rhs.high, lhs.high); + as_sltu(ScratchRegister, lhs.low, rhs.low); + as_slt(SecondScratchReg, SecondScratchReg, ScratchRegister); + as_slt(ScratchRegister, lhs.high, rhs.high); + as_or(dest, ScratchRegister, SecondScratchReg); + return (cond == Assembler::GreaterThanOrEqual) ? Assembler::Zero + : Assembler::NonZero; + break; + case Assembler::GreaterThan: + case Assembler::LessThanOrEqual: + as_slt(SecondScratchReg, lhs.high, rhs.high); + as_sltu(ScratchRegister, rhs.low, lhs.low); + as_slt(SecondScratchReg, SecondScratchReg, ScratchRegister); + as_slt(ScratchRegister, rhs.high, lhs.high); + as_or(dest, ScratchRegister, SecondScratchReg); + return (cond == Assembler::LessThanOrEqual) ? Assembler::Zero + : Assembler::NonZero; + break; + case Assembler::Below: + case Assembler::AboveOrEqual: + as_sltu(SecondScratchReg, rhs.high, lhs.high); + as_sltu(ScratchRegister, lhs.low, rhs.low); + as_slt(SecondScratchReg, SecondScratchReg, ScratchRegister); + as_sltu(ScratchRegister, lhs.high, rhs.high); + as_or(dest, ScratchRegister, SecondScratchReg); + return (cond == Assembler::AboveOrEqual) ? Assembler::Zero + : Assembler::NonZero; + break; + case Assembler::Above: + case Assembler::BelowOrEqual: + as_sltu(SecondScratchReg, lhs.high, rhs.high); + as_sltu(ScratchRegister, rhs.low, lhs.low); + as_slt(SecondScratchReg, SecondScratchReg, ScratchRegister); + as_sltu(ScratchRegister, rhs.high, lhs.high); + as_or(dest, ScratchRegister, SecondScratchReg); + return (cond == Assembler::BelowOrEqual) ? Assembler::Zero + : Assembler::NonZero; + break; + default: + MOZ_CRASH("Condition code not supported"); + break; + } +} + +Assembler::Condition MacroAssemblerMIPSCompat::ma_cmp64(Condition cond, + Register64 lhs, + Imm64 val, + Register dest) { + MOZ_ASSERT(val.value != 0); + + switch (cond) { + case Assembler::Equal: + case Assembler::NotEqual: + ma_xor(SecondScratchReg, lhs.high, val.hi()); + ma_xor(ScratchRegister, lhs.low, val.low()); + as_or(dest, SecondScratchReg, ScratchRegister); + return (cond == Assembler::Equal) ? Assembler::Zero : Assembler::NonZero; + break; + case Assembler::LessThan: + case Assembler::GreaterThanOrEqual: + ma_li(SecondScratchReg, val.hi()); + as_slt(ScratchRegister, lhs.high, SecondScratchReg); + as_slt(SecondScratchReg, SecondScratchReg, lhs.high); + as_subu(SecondScratchReg, SecondScratchReg, ScratchRegister); + ma_li(ScratchRegister, val.low()); + as_sltu(ScratchRegister, lhs.low, ScratchRegister); + as_slt(dest, SecondScratchReg, ScratchRegister); + return (cond == Assembler::GreaterThanOrEqual) ? Assembler::Zero + : Assembler::NonZero; + break; + case Assembler::GreaterThan: + case Assembler::LessThanOrEqual: + ma_li(SecondScratchReg, val.hi()); + as_slt(ScratchRegister, SecondScratchReg, lhs.high); + as_slt(SecondScratchReg, lhs.high, SecondScratchReg); + as_subu(SecondScratchReg, SecondScratchReg, ScratchRegister); + ma_li(ScratchRegister, val.low()); + as_sltu(ScratchRegister, ScratchRegister, lhs.low); + as_slt(dest, SecondScratchReg, ScratchRegister); + return (cond == Assembler::LessThanOrEqual) ? Assembler::Zero + : Assembler::NonZero; + break; + case Assembler::Below: + case Assembler::AboveOrEqual: + ma_li(SecondScratchReg, val.hi()); + as_sltu(ScratchRegister, lhs.high, SecondScratchReg); + as_sltu(SecondScratchReg, SecondScratchReg, lhs.high); + as_subu(SecondScratchReg, SecondScratchReg, ScratchRegister); + ma_li(ScratchRegister, val.low()); + as_sltu(ScratchRegister, lhs.low, ScratchRegister); + as_slt(dest, SecondScratchReg, ScratchRegister); + return (cond == Assembler::AboveOrEqual) ? Assembler::Zero + : Assembler::NonZero; + break; + case Assembler::Above: + case Assembler::BelowOrEqual: + ma_li(SecondScratchReg, val.hi()); + as_sltu(ScratchRegister, SecondScratchReg, lhs.high); + as_sltu(SecondScratchReg, lhs.high, SecondScratchReg); + as_subu(SecondScratchReg, SecondScratchReg, ScratchRegister); + ma_li(ScratchRegister, val.low()); + as_sltu(ScratchRegister, ScratchRegister, lhs.low); + as_slt(dest, SecondScratchReg, ScratchRegister); + return (cond == Assembler::BelowOrEqual) ? Assembler::Zero + : Assembler::NonZero; + break; + default: + MOZ_CRASH("Condition code not supported"); + break; + } +} + +// fp instructions +void MacroAssemblerMIPS::ma_lid(FloatRegister dest, double value) { + struct DoubleStruct { + uint32_t lo; + uint32_t hi; + }; + DoubleStruct intStruct = mozilla::BitwiseCast<DoubleStruct>(value); +#if MOZ_BIG_ENDIAN() + std::swap(intStruct.hi, intStruct.lo); +#endif + + // put hi part of 64 bit value into the odd register + if (intStruct.hi == 0) { + moveToDoubleHi(zero, dest); + } else { + ma_li(ScratchRegister, Imm32(intStruct.hi)); + moveToDoubleHi(ScratchRegister, dest); + } + + // put low part of 64 bit value into the even register + if (intStruct.lo == 0) { + moveToDoubleLo(zero, dest); + } else { + ma_li(ScratchRegister, Imm32(intStruct.lo)); + moveToDoubleLo(ScratchRegister, dest); + } +} + +void MacroAssemblerMIPS::ma_mv(FloatRegister src, ValueOperand dest) { + moveFromDoubleLo(src, dest.payloadReg()); + moveFromDoubleHi(src, dest.typeReg()); +} + +void MacroAssemblerMIPS::ma_mv(ValueOperand src, FloatRegister dest) { + moveToDoubleLo(src.payloadReg(), dest); + moveToDoubleHi(src.typeReg(), dest); +} + +void MacroAssemblerMIPS::ma_ls(FloatRegister ft, Address address) { + if (Imm16::IsInSignedRange(address.offset)) { + as_lwc1(ft, address.base, address.offset); + } else { + MOZ_ASSERT(address.base != ScratchRegister); + ma_li(ScratchRegister, Imm32(address.offset)); + if (isLoongson()) { + as_gslsx(ft, address.base, ScratchRegister, 0); + } else { + as_addu(ScratchRegister, address.base, ScratchRegister); + as_lwc1(ft, ScratchRegister, 0); + } + } +} + +void MacroAssemblerMIPS::ma_ld(FloatRegister ft, Address address) { + if (Imm16::IsInSignedRange(address.offset)) { + as_ldc1(ft, address.base, address.offset); + } else { + MOZ_ASSERT(address.base != ScratchRegister); + ma_li(ScratchRegister, Imm32(address.offset)); + if (isLoongson()) { + as_gsldx(ft, address.base, ScratchRegister, 0); + } else { + as_addu(ScratchRegister, address.base, ScratchRegister); + as_ldc1(ft, ScratchRegister, 0); + } + } +} + +void MacroAssemblerMIPS::ma_sd(FloatRegister ft, Address address) { + if (Imm16::IsInSignedRange(address.offset)) { + as_sdc1(ft, address.base, address.offset); + } else { + MOZ_ASSERT(address.base != ScratchRegister); + ma_li(ScratchRegister, Imm32(address.offset)); + if (isLoongson()) { + as_gssdx(ft, address.base, ScratchRegister, 0); + } else { + as_addu(ScratchRegister, address.base, ScratchRegister); + as_sdc1(ft, ScratchRegister, 0); + } + } +} + +void MacroAssemblerMIPS::ma_ss(FloatRegister ft, Address address) { + if (Imm16::IsInSignedRange(address.offset)) { + as_swc1(ft, address.base, address.offset); + } else { + MOZ_ASSERT(address.base != ScratchRegister); + ma_li(ScratchRegister, Imm32(address.offset)); + if (isLoongson()) { + as_gsssx(ft, address.base, ScratchRegister, 0); + } else { + as_addu(ScratchRegister, address.base, ScratchRegister); + as_swc1(ft, ScratchRegister, 0); + } + } +} + +void MacroAssemblerMIPS::ma_ldc1WordAligned(FloatRegister ft, Register base, + int32_t off) { + MOZ_ASSERT(Imm16::IsInSignedRange(off + PAYLOAD_OFFSET) && + Imm16::IsInSignedRange(off + TAG_OFFSET)); + + as_lwc1(ft, base, off + PAYLOAD_OFFSET); + as_lwc1(getOddPair(ft), base, off + TAG_OFFSET); +} + +void MacroAssemblerMIPS::ma_sdc1WordAligned(FloatRegister ft, Register base, + int32_t off) { + MOZ_ASSERT(Imm16::IsInSignedRange(off + PAYLOAD_OFFSET) && + Imm16::IsInSignedRange(off + TAG_OFFSET)); + + as_swc1(ft, base, off + PAYLOAD_OFFSET); + as_swc1(getOddPair(ft), base, off + TAG_OFFSET); +} + +void MacroAssemblerMIPS::ma_pop(FloatRegister f) { + if (f.isDouble()) { + ma_ldc1WordAligned(f, StackPointer, 0); + } else { + as_lwc1(f, StackPointer, 0); + } + + as_addiu(StackPointer, StackPointer, f.size()); +} + +void MacroAssemblerMIPS::ma_push(FloatRegister f) { + as_addiu(StackPointer, StackPointer, -f.size()); + + if (f.isDouble()) { + ma_sdc1WordAligned(f, StackPointer, 0); + } else { + as_swc1(f, StackPointer, 0); + } +} + +bool MacroAssemblerMIPSCompat::buildOOLFakeExitFrame(void* fakeReturnAddr) { + uint32_t descriptor = MakeFrameDescriptor( + asMasm().framePushed(), FrameType::IonJS, ExitFrameLayout::Size()); + + asMasm().Push(Imm32(descriptor)); // descriptor_ + asMasm().Push(ImmPtr(fakeReturnAddr)); + + return true; +} + +void MacroAssemblerMIPSCompat::move32(Imm32 imm, Register dest) { + ma_li(dest, imm); +} + +void MacroAssemblerMIPSCompat::move32(Register src, Register dest) { + ma_move(dest, src); +} + +void MacroAssemblerMIPSCompat::movePtr(Register src, Register dest) { + ma_move(dest, src); +} +void MacroAssemblerMIPSCompat::movePtr(ImmWord imm, Register dest) { + ma_li(dest, imm); +} + +void MacroAssemblerMIPSCompat::movePtr(ImmGCPtr imm, Register dest) { + ma_li(dest, imm); +} + +void MacroAssemblerMIPSCompat::movePtr(ImmPtr imm, Register dest) { + movePtr(ImmWord(uintptr_t(imm.value)), dest); +} +void MacroAssemblerMIPSCompat::movePtr(wasm::SymbolicAddress imm, + Register dest) { + append(wasm::SymbolicAccess(CodeOffset(nextOffset().getOffset()), imm)); + ma_liPatchable(dest, ImmWord(-1)); +} + +void MacroAssemblerMIPSCompat::load8ZeroExtend(const Address& address, + Register dest) { + ma_load(dest, address, SizeByte, ZeroExtend); +} + +void MacroAssemblerMIPSCompat::load8ZeroExtend(const BaseIndex& src, + Register dest) { + ma_load(dest, src, SizeByte, ZeroExtend); +} + +void MacroAssemblerMIPSCompat::load8SignExtend(const Address& address, + Register dest) { + ma_load(dest, address, SizeByte, SignExtend); +} + +void MacroAssemblerMIPSCompat::load8SignExtend(const BaseIndex& src, + Register dest) { + ma_load(dest, src, SizeByte, SignExtend); +} + +void MacroAssemblerMIPSCompat::load16ZeroExtend(const Address& address, + Register dest) { + ma_load(dest, address, SizeHalfWord, ZeroExtend); +} + +void MacroAssemblerMIPSCompat::load16ZeroExtend(const BaseIndex& src, + Register dest) { + ma_load(dest, src, SizeHalfWord, ZeroExtend); +} + +void MacroAssemblerMIPSCompat::load16SignExtend(const Address& address, + Register dest) { + ma_load(dest, address, SizeHalfWord, SignExtend); +} + +void MacroAssemblerMIPSCompat::load16SignExtend(const BaseIndex& src, + Register dest) { + ma_load(dest, src, SizeHalfWord, SignExtend); +} + +void MacroAssemblerMIPSCompat::load32(const Address& address, Register dest) { + ma_load(dest, address, SizeWord); +} + +void MacroAssemblerMIPSCompat::load32(const BaseIndex& address, Register dest) { + ma_load(dest, address, SizeWord); +} + +void MacroAssemblerMIPSCompat::load32(AbsoluteAddress address, Register dest) { + movePtr(ImmPtr(address.addr), ScratchRegister); + load32(Address(ScratchRegister, 0), dest); +} + +void MacroAssemblerMIPSCompat::load32(wasm::SymbolicAddress address, + Register dest) { + movePtr(address, ScratchRegister); + load32(Address(ScratchRegister, 0), dest); +} + +void MacroAssemblerMIPSCompat::loadPtr(const Address& address, Register dest) { + ma_load(dest, address, SizeWord); +} + +void MacroAssemblerMIPSCompat::loadPtr(const BaseIndex& src, Register dest) { + ma_load(dest, src, SizeWord); +} + +void MacroAssemblerMIPSCompat::loadPtr(AbsoluteAddress address, Register dest) { + movePtr(ImmPtr(address.addr), ScratchRegister); + loadPtr(Address(ScratchRegister, 0), dest); +} + +void MacroAssemblerMIPSCompat::loadPtr(wasm::SymbolicAddress address, + Register dest) { + movePtr(address, ScratchRegister); + loadPtr(Address(ScratchRegister, 0), dest); +} + +void MacroAssemblerMIPSCompat::loadPrivate(const Address& address, + Register dest) { + ma_lw(dest, Address(address.base, address.offset + PAYLOAD_OFFSET)); +} + +void MacroAssemblerMIPSCompat::loadUnalignedDouble( + const wasm::MemoryAccessDesc& access, const BaseIndex& src, Register temp, + FloatRegister dest) { + MOZ_ASSERT(MOZ_LITTLE_ENDIAN(), "Wasm-only; wasm is disabled on big-endian."); + computeScaledAddress(src, SecondScratchReg); + + BufferOffset load; + if (Imm16::IsInSignedRange(src.offset) && + Imm16::IsInSignedRange(src.offset + 7)) { + load = as_lwl(temp, SecondScratchReg, src.offset + INT64LOW_OFFSET + 3); + as_lwr(temp, SecondScratchReg, src.offset + INT64LOW_OFFSET); + append(access, load.getOffset()); + moveToDoubleLo(temp, dest); + load = as_lwl(temp, SecondScratchReg, src.offset + INT64HIGH_OFFSET + 3); + as_lwr(temp, SecondScratchReg, src.offset + INT64HIGH_OFFSET); + append(access, load.getOffset()); + moveToDoubleHi(temp, dest); + } else { + ma_li(ScratchRegister, Imm32(src.offset)); + as_daddu(ScratchRegister, SecondScratchReg, ScratchRegister); + load = as_lwl(temp, ScratchRegister, INT64LOW_OFFSET + 3); + as_lwr(temp, ScratchRegister, INT64LOW_OFFSET); + append(access, load.getOffset()); + moveToDoubleLo(temp, dest); + load = as_lwl(temp, ScratchRegister, INT64HIGH_OFFSET + 3); + as_lwr(temp, ScratchRegister, INT64HIGH_OFFSET); + append(access, load.getOffset()); + moveToDoubleHi(temp, dest); + } +} + +void MacroAssemblerMIPSCompat::loadUnalignedFloat32( + const wasm::MemoryAccessDesc& access, const BaseIndex& src, Register temp, + FloatRegister dest) { + MOZ_ASSERT(MOZ_LITTLE_ENDIAN(), "Wasm-only; wasm is disabled on big-endian."); + computeScaledAddress(src, SecondScratchReg); + BufferOffset load; + if (Imm16::IsInSignedRange(src.offset) && + Imm16::IsInSignedRange(src.offset + 3)) { + load = as_lwl(temp, SecondScratchReg, src.offset + 3); + as_lwr(temp, SecondScratchReg, src.offset); + } else { + ma_li(ScratchRegister, Imm32(src.offset)); + as_daddu(ScratchRegister, SecondScratchReg, ScratchRegister); + load = as_lwl(temp, ScratchRegister, 3); + as_lwr(temp, ScratchRegister, 0); + } + append(access, load.getOffset()); + moveToFloat32(temp, dest); +} + +void MacroAssemblerMIPSCompat::store8(Imm32 imm, const Address& address) { + ma_li(SecondScratchReg, imm); + ma_store(SecondScratchReg, address, SizeByte); +} + +void MacroAssemblerMIPSCompat::store8(Register src, const Address& address) { + ma_store(src, address, SizeByte); +} + +void MacroAssemblerMIPSCompat::store8(Imm32 imm, const BaseIndex& dest) { + ma_store(imm, dest, SizeByte); +} + +void MacroAssemblerMIPSCompat::store8(Register src, const BaseIndex& dest) { + ma_store(src, dest, SizeByte); +} + +void MacroAssemblerMIPSCompat::store16(Imm32 imm, const Address& address) { + ma_li(SecondScratchReg, imm); + ma_store(SecondScratchReg, address, SizeHalfWord); +} + +void MacroAssemblerMIPSCompat::store16(Register src, const Address& address) { + ma_store(src, address, SizeHalfWord); +} + +void MacroAssemblerMIPSCompat::store16(Imm32 imm, const BaseIndex& dest) { + ma_store(imm, dest, SizeHalfWord); +} + +void MacroAssemblerMIPSCompat::store16(Register src, const BaseIndex& address) { + ma_store(src, address, SizeHalfWord); +} + +void MacroAssemblerMIPSCompat::store32(Register src, AbsoluteAddress address) { + movePtr(ImmPtr(address.addr), ScratchRegister); + store32(src, Address(ScratchRegister, 0)); +} + +void MacroAssemblerMIPSCompat::store32(Register src, const Address& address) { + ma_store(src, address, SizeWord); +} + +void MacroAssemblerMIPSCompat::store32(Imm32 src, const Address& address) { + move32(src, SecondScratchReg); + ma_store(SecondScratchReg, address, SizeWord); +} + +void MacroAssemblerMIPSCompat::store32(Imm32 imm, const BaseIndex& dest) { + ma_store(imm, dest, SizeWord); +} + +void MacroAssemblerMIPSCompat::store32(Register src, const BaseIndex& dest) { + ma_store(src, dest, SizeWord); +} + +template <typename T> +void MacroAssemblerMIPSCompat::storePtr(ImmWord imm, T address) { + ma_li(SecondScratchReg, imm); + ma_store(SecondScratchReg, address, SizeWord); +} + +template void MacroAssemblerMIPSCompat::storePtr<Address>(ImmWord imm, + Address address); +template void MacroAssemblerMIPSCompat::storePtr<BaseIndex>(ImmWord imm, + BaseIndex address); + +template <typename T> +void MacroAssemblerMIPSCompat::storePtr(ImmPtr imm, T address) { + storePtr(ImmWord(uintptr_t(imm.value)), address); +} + +template void MacroAssemblerMIPSCompat::storePtr<Address>(ImmPtr imm, + Address address); +template void MacroAssemblerMIPSCompat::storePtr<BaseIndex>(ImmPtr imm, + BaseIndex address); + +template <typename T> +void MacroAssemblerMIPSCompat::storePtr(ImmGCPtr imm, T address) { + movePtr(imm, SecondScratchReg); + storePtr(SecondScratchReg, address); +} + +template void MacroAssemblerMIPSCompat::storePtr<Address>(ImmGCPtr imm, + Address address); +template void MacroAssemblerMIPSCompat::storePtr<BaseIndex>(ImmGCPtr imm, + BaseIndex address); + +void MacroAssemblerMIPSCompat::storePtr(Register src, const Address& address) { + ma_store(src, address, SizeWord); +} + +void MacroAssemblerMIPSCompat::storePtr(Register src, + const BaseIndex& address) { + ma_store(src, address, SizeWord); +} + +void MacroAssemblerMIPSCompat::storePtr(Register src, AbsoluteAddress dest) { + movePtr(ImmPtr(dest.addr), ScratchRegister); + storePtr(src, Address(ScratchRegister, 0)); +} + +void MacroAssemblerMIPSCompat::storeUnalignedFloat32( + const wasm::MemoryAccessDesc& access, FloatRegister src, Register temp, + const BaseIndex& dest) { + MOZ_ASSERT(MOZ_LITTLE_ENDIAN(), "Wasm-only; wasm is disabled on big-endian."); + computeScaledAddress(dest, SecondScratchReg); + moveFromFloat32(src, temp); + + BufferOffset store; + if (Imm16::IsInSignedRange(dest.offset) && + Imm16::IsInSignedRange(dest.offset + 3)) { + store = as_swl(temp, SecondScratchReg, dest.offset + 3); + as_swr(temp, SecondScratchReg, dest.offset); + } else { + ma_li(ScratchRegister, Imm32(dest.offset)); + as_daddu(ScratchRegister, SecondScratchReg, ScratchRegister); + store = as_swl(temp, ScratchRegister, 3); + as_swr(temp, ScratchRegister, 0); + } + append(access, store.getOffset()); +} + +void MacroAssemblerMIPSCompat::storeUnalignedDouble( + const wasm::MemoryAccessDesc& access, FloatRegister src, Register temp, + const BaseIndex& dest) { + MOZ_ASSERT(MOZ_LITTLE_ENDIAN(), "Wasm-only; wasm is disabled on big-endian."); + computeScaledAddress(dest, SecondScratchReg); + + BufferOffset store; + if (Imm16::IsInSignedRange(dest.offset) && + Imm16::IsInSignedRange(dest.offset + 7)) { + moveFromDoubleHi(src, temp); + store = as_swl(temp, SecondScratchReg, dest.offset + INT64HIGH_OFFSET + 3); + as_swr(temp, SecondScratchReg, dest.offset + INT64HIGH_OFFSET); + moveFromDoubleLo(src, temp); + as_swl(temp, SecondScratchReg, dest.offset + INT64LOW_OFFSET + 3); + as_swr(temp, SecondScratchReg, dest.offset + INT64LOW_OFFSET); + + } else { + ma_li(ScratchRegister, Imm32(dest.offset)); + as_daddu(ScratchRegister, SecondScratchReg, ScratchRegister); + moveFromDoubleHi(src, temp); + store = as_swl(temp, ScratchRegister, INT64HIGH_OFFSET + 3); + as_swr(temp, ScratchRegister, INT64HIGH_OFFSET); + moveFromDoubleLo(src, temp); + as_swl(temp, ScratchRegister, INT64LOW_OFFSET + 3); + as_swr(temp, ScratchRegister, INT64LOW_OFFSET); + } + append(access, store.getOffset()); +} + +void MacroAssembler::clampDoubleToUint8(FloatRegister input, Register output) { + as_roundwd(ScratchDoubleReg, input); + ma_li(ScratchRegister, Imm32(255)); + as_mfc1(output, ScratchDoubleReg); + zeroDouble(ScratchDoubleReg); + as_sltiu(SecondScratchReg, output, 255); + as_colt(DoubleFloat, ScratchDoubleReg, input); + // if res > 255; res = 255; + as_movz(output, ScratchRegister, SecondScratchReg); + // if !(input > 0); res = 0; + as_movf(output, zero); +} + +// higher level tag testing code +Operand MacroAssemblerMIPSCompat::ToPayload(Operand base) { + return Operand(Register::FromCode(base.base()), base.disp() + PAYLOAD_OFFSET); +} + +Operand MacroAssemblerMIPSCompat::ToType(Operand base) { + return Operand(Register::FromCode(base.base()), base.disp() + TAG_OFFSET); +} + +void MacroAssemblerMIPSCompat::testNullSet(Condition cond, + const ValueOperand& value, + Register dest) { + MOZ_ASSERT(cond == Equal || cond == NotEqual); + ma_cmp_set(dest, value.typeReg(), ImmType(JSVAL_TYPE_NULL), cond); +} + +void MacroAssemblerMIPSCompat::testObjectSet(Condition cond, + const ValueOperand& value, + Register dest) { + MOZ_ASSERT(cond == Equal || cond == NotEqual); + ma_cmp_set(dest, value.typeReg(), ImmType(JSVAL_TYPE_OBJECT), cond); +} + +void MacroAssemblerMIPSCompat::testUndefinedSet(Condition cond, + const ValueOperand& value, + Register dest) { + MOZ_ASSERT(cond == Equal || cond == NotEqual); + ma_cmp_set(dest, value.typeReg(), ImmType(JSVAL_TYPE_UNDEFINED), cond); +} + +// unboxing code +void MacroAssemblerMIPSCompat::unboxNonDouble(const ValueOperand& operand, + Register dest, JSValueType) { + if (operand.payloadReg() != dest) { + ma_move(dest, operand.payloadReg()); + } +} + +void MacroAssemblerMIPSCompat::unboxNonDouble(const Address& src, Register dest, + JSValueType) { + ma_lw(dest, Address(src.base, src.offset + PAYLOAD_OFFSET)); +} + +void MacroAssemblerMIPSCompat::unboxNonDouble(const BaseIndex& src, + Register dest, JSValueType) { + computeScaledAddress(src, SecondScratchReg); + ma_lw(dest, Address(SecondScratchReg, src.offset + PAYLOAD_OFFSET)); +} + +void MacroAssemblerMIPSCompat::unboxInt32(const ValueOperand& operand, + Register dest) { + ma_move(dest, operand.payloadReg()); +} + +void MacroAssemblerMIPSCompat::unboxInt32(const Address& src, Register dest) { + ma_lw(dest, Address(src.base, src.offset + PAYLOAD_OFFSET)); +} + +void MacroAssemblerMIPSCompat::unboxBoolean(const ValueOperand& operand, + Register dest) { + ma_move(dest, operand.payloadReg()); +} + +void MacroAssemblerMIPSCompat::unboxBoolean(const Address& src, Register dest) { + ma_lw(dest, Address(src.base, src.offset + PAYLOAD_OFFSET)); +} + +void MacroAssemblerMIPSCompat::unboxDouble(const ValueOperand& operand, + FloatRegister dest) { + moveToDoubleLo(operand.payloadReg(), dest); + moveToDoubleHi(operand.typeReg(), dest); +} + +void MacroAssemblerMIPSCompat::unboxDouble(const Address& src, + FloatRegister dest) { + ma_lw(ScratchRegister, Address(src.base, src.offset + PAYLOAD_OFFSET)); + moveToDoubleLo(ScratchRegister, dest); + ma_lw(ScratchRegister, Address(src.base, src.offset + TAG_OFFSET)); + moveToDoubleHi(ScratchRegister, dest); +} + +void MacroAssemblerMIPSCompat::unboxDouble(const BaseIndex& src, + FloatRegister dest) { + loadDouble(src, dest); +} + +void MacroAssemblerMIPSCompat::unboxString(const ValueOperand& operand, + Register dest) { + ma_move(dest, operand.payloadReg()); +} + +void MacroAssemblerMIPSCompat::unboxString(const Address& src, Register dest) { + ma_lw(dest, Address(src.base, src.offset + PAYLOAD_OFFSET)); +} + +void MacroAssemblerMIPSCompat::unboxBigInt(const ValueOperand& operand, + Register dest) { + ma_move(dest, operand.payloadReg()); +} + +void MacroAssemblerMIPSCompat::unboxBigInt(const Address& src, Register dest) { + ma_lw(dest, Address(src.base, src.offset + PAYLOAD_OFFSET)); +} + +void MacroAssemblerMIPSCompat::unboxObject(const ValueOperand& src, + Register dest) { + ma_move(dest, src.payloadReg()); +} + +void MacroAssemblerMIPSCompat::unboxObject(const Address& src, Register dest) { + ma_lw(dest, Address(src.base, src.offset + PAYLOAD_OFFSET)); +} + +void MacroAssemblerMIPSCompat::unboxObjectOrNull(const Address& src, + Register dest) { + ma_lw(dest, Address(src.base, src.offset + PAYLOAD_OFFSET)); +} + +void MacroAssemblerMIPSCompat::unboxValue(const ValueOperand& src, + AnyRegister dest, JSValueType) { + if (dest.isFloat()) { + Label notInt32, end; + asMasm().branchTestInt32(Assembler::NotEqual, src, ¬Int32); + convertInt32ToDouble(src.payloadReg(), dest.fpu()); + ma_b(&end, ShortJump); + bind(¬Int32); + unboxDouble(src, dest.fpu()); + bind(&end); + } else if (src.payloadReg() != dest.gpr()) { + ma_move(dest.gpr(), src.payloadReg()); + } +} + +void MacroAssemblerMIPSCompat::boxDouble(FloatRegister src, + const ValueOperand& dest, + FloatRegister) { + moveFromDoubleLo(src, dest.payloadReg()); + moveFromDoubleHi(src, dest.typeReg()); +} + +void MacroAssemblerMIPSCompat::boxNonDouble(JSValueType type, Register src, + const ValueOperand& dest) { + if (src != dest.payloadReg()) { + ma_move(dest.payloadReg(), src); + } + ma_li(dest.typeReg(), ImmType(type)); +} + +void MacroAssemblerMIPSCompat::boolValueToDouble(const ValueOperand& operand, + FloatRegister dest) { + convertBoolToInt32(operand.payloadReg(), ScratchRegister); + convertInt32ToDouble(ScratchRegister, dest); +} + +void MacroAssemblerMIPSCompat::int32ValueToDouble(const ValueOperand& operand, + FloatRegister dest) { + convertInt32ToDouble(operand.payloadReg(), dest); +} + +void MacroAssemblerMIPSCompat::boolValueToFloat32(const ValueOperand& operand, + FloatRegister dest) { + convertBoolToInt32(operand.payloadReg(), ScratchRegister); + convertInt32ToFloat32(ScratchRegister, dest); +} + +void MacroAssemblerMIPSCompat::int32ValueToFloat32(const ValueOperand& operand, + FloatRegister dest) { + convertInt32ToFloat32(operand.payloadReg(), dest); +} + +void MacroAssemblerMIPSCompat::loadConstantFloat32(float f, + FloatRegister dest) { + ma_lis(dest, f); +} + +void MacroAssemblerMIPSCompat::loadInt32OrDouble(const Address& src, + FloatRegister dest) { + Label notInt32, end; + // If it's an int, convert it to double. + ma_lw(SecondScratchReg, Address(src.base, src.offset + TAG_OFFSET)); + asMasm().branchTestInt32(Assembler::NotEqual, SecondScratchReg, ¬Int32); + ma_lw(SecondScratchReg, Address(src.base, src.offset + PAYLOAD_OFFSET)); + convertInt32ToDouble(SecondScratchReg, dest); + ma_b(&end, ShortJump); + + // Not an int, just load as double. + bind(¬Int32); + ma_ld(dest, src); + bind(&end); +} + +void MacroAssemblerMIPSCompat::loadInt32OrDouble(Register base, Register index, + FloatRegister dest, + int32_t shift) { + Label notInt32, end; + + // If it's an int, convert it to double. + + computeScaledAddress(BaseIndex(base, index, ShiftToScale(shift)), + SecondScratchReg); + // Since we only have one scratch, we need to stomp over it with the tag. + load32(Address(SecondScratchReg, TAG_OFFSET), SecondScratchReg); + asMasm().branchTestInt32(Assembler::NotEqual, SecondScratchReg, ¬Int32); + + computeScaledAddress(BaseIndex(base, index, ShiftToScale(shift)), + SecondScratchReg); + load32(Address(SecondScratchReg, PAYLOAD_OFFSET), SecondScratchReg); + convertInt32ToDouble(SecondScratchReg, dest); + ma_b(&end, ShortJump); + + // Not an int, just load as double. + bind(¬Int32); + // First, recompute the offset that had been stored in the scratch register + // since the scratch register was overwritten loading in the type. + computeScaledAddress(BaseIndex(base, index, ShiftToScale(shift)), + SecondScratchReg); + loadDouble(Address(SecondScratchReg, 0), dest); + bind(&end); +} + +void MacroAssemblerMIPSCompat::loadConstantDouble(double dp, + FloatRegister dest) { + ma_lid(dest, dp); +} + +Register MacroAssemblerMIPSCompat::extractObject(const Address& address, + Register scratch) { + ma_lw(scratch, Address(address.base, address.offset + PAYLOAD_OFFSET)); + return scratch; +} + +Register MacroAssemblerMIPSCompat::extractTag(const Address& address, + Register scratch) { + ma_lw(scratch, Address(address.base, address.offset + TAG_OFFSET)); + return scratch; +} + +Register MacroAssemblerMIPSCompat::extractTag(const BaseIndex& address, + Register scratch) { + computeScaledAddress(address, scratch); + return extractTag(Address(scratch, address.offset), scratch); +} + +uint32_t MacroAssemblerMIPSCompat::getType(const Value& val) { + return val.toNunboxTag(); +} + +void MacroAssemblerMIPSCompat::moveData(const Value& val, Register data) { + if (val.isGCThing()) { + ma_li(data, ImmGCPtr(val.toGCThing())); + } else { + ma_li(data, Imm32(val.toNunboxPayload())); + } +} + +///////////////////////////////////////////////////////////////// +// X86/X64-common/ARM/MIPS interface. +///////////////////////////////////////////////////////////////// +void MacroAssemblerMIPSCompat::storeValue(ValueOperand val, Operand dst) { + storeValue(val, Address(Register::FromCode(dst.base()), dst.disp())); +} + +void MacroAssemblerMIPSCompat::storeValue(ValueOperand val, + const BaseIndex& dest) { + computeScaledAddress(dest, SecondScratchReg); + storeValue(val, Address(SecondScratchReg, dest.offset)); +} + +void MacroAssemblerMIPSCompat::storeValue(JSValueType type, Register reg, + BaseIndex dest) { + computeScaledAddress(dest, ScratchRegister); + + // Make sure that ma_sw doesn't clobber ScratchRegister + int32_t offset = dest.offset; + if (!Imm16::IsInSignedRange(offset)) { + ma_li(SecondScratchReg, Imm32(offset)); + as_addu(ScratchRegister, ScratchRegister, SecondScratchReg); + offset = 0; + } + + storeValue(type, reg, Address(ScratchRegister, offset)); +} + +void MacroAssemblerMIPSCompat::storeValue(ValueOperand val, + const Address& dest) { + ma_sw(val.payloadReg(), Address(dest.base, dest.offset + PAYLOAD_OFFSET)); + ma_sw(val.typeReg(), Address(dest.base, dest.offset + TAG_OFFSET)); +} + +void MacroAssemblerMIPSCompat::storeValue(JSValueType type, Register reg, + Address dest) { + MOZ_ASSERT(dest.base != SecondScratchReg); + + ma_sw(reg, Address(dest.base, dest.offset + PAYLOAD_OFFSET)); + ma_li(SecondScratchReg, ImmTag(JSVAL_TYPE_TO_TAG(type))); + ma_sw(SecondScratchReg, Address(dest.base, dest.offset + TAG_OFFSET)); +} + +void MacroAssemblerMIPSCompat::storeValue(const Value& val, Address dest) { + MOZ_ASSERT(dest.base != SecondScratchReg); + + ma_li(SecondScratchReg, Imm32(getType(val))); + ma_sw(SecondScratchReg, Address(dest.base, dest.offset + TAG_OFFSET)); + moveData(val, SecondScratchReg); + ma_sw(SecondScratchReg, Address(dest.base, dest.offset + PAYLOAD_OFFSET)); +} + +void MacroAssemblerMIPSCompat::storeValue(const Value& val, BaseIndex dest) { + computeScaledAddress(dest, ScratchRegister); + + // Make sure that ma_sw doesn't clobber ScratchRegister + int32_t offset = dest.offset; + if (!Imm16::IsInSignedRange(offset)) { + ma_li(SecondScratchReg, Imm32(offset)); + as_addu(ScratchRegister, ScratchRegister, SecondScratchReg); + offset = 0; + } + storeValue(val, Address(ScratchRegister, offset)); +} + +void MacroAssemblerMIPSCompat::loadValue(const BaseIndex& addr, + ValueOperand val) { + computeScaledAddress(addr, SecondScratchReg); + loadValue(Address(SecondScratchReg, addr.offset), val); +} + +void MacroAssemblerMIPSCompat::loadValue(Address src, ValueOperand val) { + // Ensure that loading the payload does not erase the pointer to the + // Value in memory. + if (src.base != val.payloadReg()) { + ma_lw(val.payloadReg(), Address(src.base, src.offset + PAYLOAD_OFFSET)); + ma_lw(val.typeReg(), Address(src.base, src.offset + TAG_OFFSET)); + } else { + ma_lw(val.typeReg(), Address(src.base, src.offset + TAG_OFFSET)); + ma_lw(val.payloadReg(), Address(src.base, src.offset + PAYLOAD_OFFSET)); + } +} + +void MacroAssemblerMIPSCompat::tagValue(JSValueType type, Register payload, + ValueOperand dest) { + MOZ_ASSERT(dest.typeReg() != dest.payloadReg()); + if (payload != dest.payloadReg()) { + ma_move(dest.payloadReg(), payload); + } + ma_li(dest.typeReg(), ImmType(type)); +} + +void MacroAssemblerMIPSCompat::pushValue(ValueOperand val) { + // Allocate stack slots for type and payload. One for each. + asMasm().subPtr(Imm32(sizeof(Value)), StackPointer); + // Store type and payload. + storeValue(val, Address(StackPointer, 0)); +} + +void MacroAssemblerMIPSCompat::pushValue(const Address& addr) { + // Allocate stack slots for type and payload. One for each. + ma_subu(StackPointer, StackPointer, Imm32(sizeof(Value))); + // If address is based on StackPointer its offset needs to be adjusted + // to accommodate for previous stack allocation. + int32_t offset = + addr.base != StackPointer ? addr.offset : addr.offset + sizeof(Value); + // Store type and payload. + ma_lw(ScratchRegister, Address(addr.base, offset + TAG_OFFSET)); + ma_sw(ScratchRegister, Address(StackPointer, TAG_OFFSET)); + ma_lw(ScratchRegister, Address(addr.base, offset + PAYLOAD_OFFSET)); + ma_sw(ScratchRegister, Address(StackPointer, PAYLOAD_OFFSET)); +} + +void MacroAssemblerMIPSCompat::popValue(ValueOperand val) { + // Load payload and type. + as_lw(val.payloadReg(), StackPointer, PAYLOAD_OFFSET); + as_lw(val.typeReg(), StackPointer, TAG_OFFSET); + // Free stack. + as_addiu(StackPointer, StackPointer, sizeof(Value)); +} + +void MacroAssemblerMIPSCompat::storePayload(const Value& val, Address dest) { + moveData(val, SecondScratchReg); + ma_sw(SecondScratchReg, Address(dest.base, dest.offset + PAYLOAD_OFFSET)); +} + +void MacroAssemblerMIPSCompat::storePayload(Register src, Address dest) { + ma_sw(src, Address(dest.base, dest.offset + PAYLOAD_OFFSET)); + return; +} + +void MacroAssemblerMIPSCompat::storePayload(const Value& val, + const BaseIndex& dest) { + MOZ_ASSERT(dest.offset == 0); + + computeScaledAddress(dest, SecondScratchReg); + + moveData(val, ScratchRegister); + + as_sw(ScratchRegister, SecondScratchReg, NUNBOX32_PAYLOAD_OFFSET); +} + +void MacroAssemblerMIPSCompat::storePayload(Register src, + const BaseIndex& dest) { + MOZ_ASSERT(dest.offset == 0); + + computeScaledAddress(dest, SecondScratchReg); + as_sw(src, SecondScratchReg, NUNBOX32_PAYLOAD_OFFSET); +} + +void MacroAssemblerMIPSCompat::storeTypeTag(ImmTag tag, Address dest) { + ma_li(SecondScratchReg, tag); + ma_sw(SecondScratchReg, Address(dest.base, dest.offset + TAG_OFFSET)); +} + +void MacroAssemblerMIPSCompat::storeTypeTag(ImmTag tag, const BaseIndex& dest) { + MOZ_ASSERT(dest.offset == 0); + + computeScaledAddress(dest, SecondScratchReg); + ma_li(ScratchRegister, tag); + as_sw(ScratchRegister, SecondScratchReg, TAG_OFFSET); +} + +void MacroAssemblerMIPSCompat::breakpoint() { as_break(0); } + +void MacroAssemblerMIPSCompat::ensureDouble(const ValueOperand& source, + FloatRegister dest, + Label* failure) { + Label isDouble, done; + asMasm().branchTestDouble(Assembler::Equal, source.typeReg(), &isDouble); + asMasm().branchTestInt32(Assembler::NotEqual, source.typeReg(), failure); + + convertInt32ToDouble(source.payloadReg(), dest); + jump(&done); + + bind(&isDouble); + unboxDouble(source, dest); + + bind(&done); +} + +void MacroAssemblerMIPSCompat::checkStackAlignment() { +#ifdef DEBUG + Label aligned; + as_andi(ScratchRegister, sp, ABIStackAlignment - 1); + ma_b(ScratchRegister, zero, &aligned, Equal, ShortJump); + as_break(BREAK_STACK_UNALIGNED); + bind(&aligned); +#endif +} + +void MacroAssemblerMIPSCompat::alignStackPointer() { + movePtr(StackPointer, SecondScratchReg); + asMasm().subPtr(Imm32(sizeof(intptr_t)), StackPointer); + asMasm().andPtr(Imm32(~(ABIStackAlignment - 1)), StackPointer); + storePtr(SecondScratchReg, Address(StackPointer, 0)); +} + +void MacroAssemblerMIPSCompat::restoreStackPointer() { + loadPtr(Address(StackPointer, 0), StackPointer); +} + +void MacroAssemblerMIPSCompat::handleFailureWithHandlerTail( + Label* profilerExitTail) { + // Reserve space for exception information. + int size = (sizeof(ResumeFromException) + ABIStackAlignment) & + ~(ABIStackAlignment - 1); + asMasm().subPtr(Imm32(size), StackPointer); + ma_move(a0, StackPointer); // Use a0 since it is a first function argument + + // Call the handler. + using Fn = void (*)(ResumeFromException * rfe); + asMasm().setupUnalignedABICall(a1); + asMasm().passABIArg(a0); + asMasm().callWithABI<Fn, HandleException>( + MoveOp::GENERAL, CheckUnsafeCallWithABI::DontCheckHasExitFrame); + + Label entryFrame; + Label catch_; + Label finally; + Label return_; + Label bailout; + Label wasm; + + // Already clobbered a0, so use it... + load32(Address(StackPointer, offsetof(ResumeFromException, kind)), a0); + asMasm().branch32(Assembler::Equal, a0, + Imm32(ResumeFromException::RESUME_ENTRY_FRAME), + &entryFrame); + asMasm().branch32(Assembler::Equal, a0, + Imm32(ResumeFromException::RESUME_CATCH), &catch_); + asMasm().branch32(Assembler::Equal, a0, + Imm32(ResumeFromException::RESUME_FINALLY), &finally); + asMasm().branch32(Assembler::Equal, a0, + Imm32(ResumeFromException::RESUME_FORCED_RETURN), &return_); + asMasm().branch32(Assembler::Equal, a0, + Imm32(ResumeFromException::RESUME_BAILOUT), &bailout); + asMasm().branch32(Assembler::Equal, a0, + Imm32(ResumeFromException::RESUME_WASM), &wasm); + + breakpoint(); // Invalid kind. + + // No exception handler. Load the error value, load the new stack pointer + // and return from the entry frame. + bind(&entryFrame); + asMasm().moveValue(MagicValue(JS_ION_ERROR), JSReturnOperand); + loadPtr(Address(StackPointer, offsetof(ResumeFromException, stackPointer)), + StackPointer); + + // We're going to be returning by the ion calling convention + ma_pop(ra); + as_jr(ra); + as_nop(); + + // If we found a catch handler, this must be a baseline frame. Restore + // state and jump to the catch block. + bind(&catch_); + loadPtr(Address(StackPointer, offsetof(ResumeFromException, target)), a0); + loadPtr(Address(StackPointer, offsetof(ResumeFromException, framePointer)), + BaselineFrameReg); + loadPtr(Address(StackPointer, offsetof(ResumeFromException, stackPointer)), + StackPointer); + jump(a0); + + // If we found a finally block, this must be a baseline frame. Push + // two values expected by JSOp::Retsub: BooleanValue(true) and the + // exception. + bind(&finally); + ValueOperand exception = ValueOperand(a1, a2); + loadValue(Address(sp, offsetof(ResumeFromException, exception)), exception); + + loadPtr(Address(sp, offsetof(ResumeFromException, target)), a0); + loadPtr(Address(sp, offsetof(ResumeFromException, framePointer)), + BaselineFrameReg); + loadPtr(Address(sp, offsetof(ResumeFromException, stackPointer)), sp); + + pushValue(BooleanValue(true)); + pushValue(exception); + jump(a0); + + // Only used in debug mode. Return BaselineFrame->returnValue() to the + // caller. + bind(&return_); + loadPtr(Address(StackPointer, offsetof(ResumeFromException, framePointer)), + BaselineFrameReg); + loadPtr(Address(StackPointer, offsetof(ResumeFromException, stackPointer)), + StackPointer); + loadValue( + Address(BaselineFrameReg, BaselineFrame::reverseOffsetOfReturnValue()), + JSReturnOperand); + ma_move(StackPointer, BaselineFrameReg); + pop(BaselineFrameReg); + + // If profiling is enabled, then update the lastProfilingFrame to refer to + // caller frame before returning. + { + Label skipProfilingInstrumentation; + // Test if profiler enabled. + AbsoluteAddress addressOfEnabled( + GetJitContext()->runtime->geckoProfiler().addressOfEnabled()); + asMasm().branch32(Assembler::Equal, addressOfEnabled, Imm32(0), + &skipProfilingInstrumentation); + jump(profilerExitTail); + bind(&skipProfilingInstrumentation); + } + + ret(); + + // If we are bailing out to baseline to handle an exception, jump to + // the bailout tail stub. Load 1 (true) in ReturnReg to indicate success. + bind(&bailout); + loadPtr(Address(sp, offsetof(ResumeFromException, bailoutInfo)), a2); + ma_li(ReturnReg, Imm32(1)); + loadPtr(Address(sp, offsetof(ResumeFromException, target)), a1); + jump(a1); + + // If we are throwing and the innermost frame was a wasm frame, reset SP and + // FP; SP is pointing to the unwound return address to the wasm entry, so + // we can just ret(). + bind(&wasm); + loadPtr(Address(StackPointer, offsetof(ResumeFromException, framePointer)), + FramePointer); + loadPtr(Address(StackPointer, offsetof(ResumeFromException, stackPointer)), + StackPointer); + ret(); +} + +CodeOffset MacroAssemblerMIPSCompat::toggledJump(Label* label) { + CodeOffset ret(nextOffset().getOffset()); + ma_b(label); + return ret; +} + +CodeOffset MacroAssemblerMIPSCompat::toggledCall(JitCode* target, + bool enabled) { + BufferOffset bo = nextOffset(); + CodeOffset offset(bo.getOffset()); + addPendingJump(bo, ImmPtr(target->raw()), RelocationKind::JITCODE); + ma_liPatchable(ScratchRegister, ImmPtr(target->raw())); + if (enabled) { + as_jalr(ScratchRegister); + as_nop(); + } else { + as_nop(); + as_nop(); + } + MOZ_ASSERT_IF(!oom(), nextOffset().getOffset() - offset.offset() == + ToggledCallSize(nullptr)); + return offset; +} + +void MacroAssemblerMIPSCompat::profilerEnterFrame(Register framePtr, + Register scratch) { + asMasm().loadJSContext(scratch); + loadPtr(Address(scratch, offsetof(JSContext, profilingActivation_)), scratch); + storePtr(framePtr, + Address(scratch, JitActivation::offsetOfLastProfilingFrame())); + storePtr(ImmPtr(nullptr), + Address(scratch, JitActivation::offsetOfLastProfilingCallSite())); +} + +void MacroAssemblerMIPSCompat::profilerExitFrame() { + jump(GetJitContext()->runtime->jitRuntime()->getProfilerExitFrameTail()); +} + +void MacroAssembler::subFromStackPtr(Imm32 imm32) { + if (imm32.value) { + asMasm().subPtr(imm32, StackPointer); + } +} + +//{{{ check_macroassembler_style +// =============================================================== +// Stack manipulation functions. + +void MacroAssembler::PushRegsInMask(LiveRegisterSet set) { + int32_t diffF = set.fpus().getPushSizeInBytes(); + int32_t diffG = set.gprs().size() * sizeof(intptr_t); + + reserveStack(diffG); + for (GeneralRegisterBackwardIterator iter(set.gprs()); iter.more(); ++iter) { + diffG -= sizeof(intptr_t); + storePtr(*iter, Address(StackPointer, diffG)); + } + MOZ_ASSERT(diffG == 0); + +#ifdef ENABLE_WASM_SIMD +# error "Needs more careful logic if SIMD is enabled" +#endif + + if (diffF > 0) { + // Double values have to be aligned. We reserve extra space so that we can + // start writing from the first aligned location. + // We reserve a whole extra double so that the buffer has even size. + ma_and(SecondScratchReg, sp, Imm32(~(ABIStackAlignment - 1))); + reserveStack(diffF); + + diffF -= sizeof(double); + + for (FloatRegisterForwardIterator iter(set.fpus().reduceSetForPush()); + iter.more(); ++iter) { + as_sdc1(*iter, SecondScratchReg, -diffF); + diffF -= sizeof(double); + } + + MOZ_ASSERT(diffF == 0); + } +} + +void MacroAssembler::PopRegsInMaskIgnore(LiveRegisterSet set, + LiveRegisterSet ignore) { + int32_t diffG = set.gprs().size() * sizeof(intptr_t); + int32_t diffF = set.fpus().getPushSizeInBytes(); + const int32_t reservedG = diffG; + const int32_t reservedF = diffF; + +#ifdef ENABLE_WASM_SIMD +# error "Needs more careful logic if SIMD is enabled" +#endif + + if (reservedF > 0) { + // Read the buffer form the first aligned location. + ma_addu(SecondScratchReg, sp, Imm32(reservedF)); + ma_and(SecondScratchReg, SecondScratchReg, Imm32(~(ABIStackAlignment - 1))); + + diffF -= sizeof(double); + + LiveFloatRegisterSet fpignore(ignore.fpus().reduceSetForPush()); + for (FloatRegisterForwardIterator iter(set.fpus().reduceSetForPush()); + iter.more(); ++iter) { + if (!ignore.has(*iter)) { + as_ldc1(*iter, SecondScratchReg, -diffF); + } + diffF -= sizeof(double); + } + freeStack(reservedF); + MOZ_ASSERT(diffF == 0); + } + + for (GeneralRegisterBackwardIterator iter(set.gprs()); iter.more(); ++iter) { + diffG -= sizeof(intptr_t); + if (!ignore.has(*iter)) { + loadPtr(Address(StackPointer, diffG), *iter); + } + } + freeStack(reservedG); + MOZ_ASSERT(diffG == 0); +} + +void MacroAssembler::storeRegsInMask(LiveRegisterSet set, Address dest, + Register scratch) { + int32_t diffF = set.fpus().getPushSizeInBytes(); + int32_t diffG = set.gprs().size() * sizeof(intptr_t); + + MOZ_ASSERT(dest.offset >= diffG + diffF); + MOZ_ASSERT(dest.base == StackPointer); + + for (GeneralRegisterBackwardIterator iter(set.gprs()); iter.more(); ++iter) { + diffG -= sizeof(intptr_t); + dest.offset -= sizeof(intptr_t); + storePtr(*iter, dest); + } + MOZ_ASSERT(diffG == 0); + +#ifdef ENABLE_WASM_SIMD +# error "Needs more careful logic if SIMD is enabled" +#endif + + if (diffF > 0) { + computeEffectiveAddress(dest, scratch); + ma_and(scratch, scratch, Imm32(~(ABIStackAlignment - 1))); + + diffF -= sizeof(double); + + for (FloatRegisterForwardIterator iter(set.fpus().reduceSetForPush()); + iter.more(); ++iter) { + as_sdc1(*iter, scratch, -diffF); + diffF -= sizeof(double); + } + MOZ_ASSERT(diffF == 0); + } +} +// =============================================================== +// ABI function calls. + +void MacroAssembler::setupUnalignedABICall(Register scratch) { + MOZ_ASSERT(!IsCompilingWasm(), "wasm should only use aligned ABI calls"); + setupNativeABICall(); + dynamicAlignment_ = true; + + ma_move(scratch, StackPointer); + + // Force sp to be aligned + asMasm().subPtr(Imm32(sizeof(uintptr_t)), StackPointer); + ma_and(StackPointer, StackPointer, Imm32(~(ABIStackAlignment - 1))); + storePtr(scratch, Address(StackPointer, 0)); +} + +void MacroAssembler::callWithABIPre(uint32_t* stackAdjust, bool callFromWasm) { + MOZ_ASSERT(inCall_); + uint32_t stackForCall = abiArgs_.stackBytesConsumedSoFar(); + + // Reserve place for $ra. + stackForCall += sizeof(intptr_t); + + if (dynamicAlignment_) { + stackForCall += ComputeByteAlignment(stackForCall, ABIStackAlignment); + } else { + uint32_t alignmentAtPrologue = callFromWasm ? sizeof(wasm::Frame) : 0; + stackForCall += ComputeByteAlignment( + stackForCall + framePushed() + alignmentAtPrologue, ABIStackAlignment); + } + + *stackAdjust = stackForCall; + reserveStack(stackForCall); + + // Save $ra because call is going to clobber it. Restore it in + // callWithABIPost. NOTE: This is needed for calls from SharedIC. + // Maybe we can do this differently. + storePtr(ra, Address(StackPointer, stackForCall - sizeof(intptr_t))); + + // Position all arguments. + { + enoughMemory_ &= moveResolver_.resolve(); + if (!enoughMemory_) { + return; + } + + MoveEmitter emitter(*this); + emitter.emit(moveResolver_); + emitter.finish(); + } + + assertStackAlignment(ABIStackAlignment); +} + +void MacroAssembler::callWithABIPost(uint32_t stackAdjust, MoveOp::Type result, + bool callFromWasm) { + // Restore ra value (as stored in callWithABIPre()). + loadPtr(Address(StackPointer, stackAdjust - sizeof(intptr_t)), ra); + + if (dynamicAlignment_) { + // Restore sp value from stack (as stored in setupUnalignedABICall()). + loadPtr(Address(StackPointer, stackAdjust), StackPointer); + // Use adjustFrame instead of freeStack because we already restored sp. + adjustFrame(-stackAdjust); + } else { + freeStack(stackAdjust); + } + +#ifdef DEBUG + MOZ_ASSERT(inCall_); + inCall_ = false; +#endif +} + +void MacroAssembler::callWithABINoProfiler(Register fun, MoveOp::Type result) { + // Load the callee in t9, no instruction between the lw and call + // should clobber it. Note that we can't use fun.base because it may + // be one of the IntArg registers clobbered before the call. + ma_move(t9, fun); + uint32_t stackAdjust; + callWithABIPre(&stackAdjust); + call(t9); + callWithABIPost(stackAdjust, result); +} + +void MacroAssembler::callWithABINoProfiler(const Address& fun, + MoveOp::Type result) { + // Load the callee in t9, as above. + loadPtr(Address(fun.base, fun.offset), t9); + uint32_t stackAdjust; + callWithABIPre(&stackAdjust); + call(t9); + callWithABIPost(stackAdjust, result); +} +// =============================================================== +// Move instructions + +void MacroAssembler::moveValue(const TypedOrValueRegister& src, + const ValueOperand& dest) { + if (src.hasValue()) { + moveValue(src.valueReg(), dest); + return; + } + + MIRType type = src.type(); + AnyRegister reg = src.typedReg(); + + if (!IsFloatingPointType(type)) { + mov(ImmWord(MIRTypeToTag(type)), dest.typeReg()); + if (reg.gpr() != dest.payloadReg()) { + move32(reg.gpr(), dest.payloadReg()); + } + return; + } + + ScratchDoubleScope scratch(*this); + FloatRegister freg = reg.fpu(); + if (type == MIRType::Float32) { + convertFloat32ToDouble(freg, scratch); + freg = scratch; + } + boxDouble(freg, dest, scratch); +} + +void MacroAssembler::moveValue(const ValueOperand& src, + const ValueOperand& dest) { + Register s0 = src.typeReg(); + Register s1 = src.payloadReg(); + Register d0 = dest.typeReg(); + Register d1 = dest.payloadReg(); + + // Either one or both of the source registers could be the same as a + // destination register. + if (s1 == d0) { + if (s0 == d1) { + // If both are, this is just a swap of two registers. + ScratchRegisterScope scratch(*this); + MOZ_ASSERT(d1 != scratch); + MOZ_ASSERT(d0 != scratch); + move32(d1, scratch); + move32(d0, d1); + move32(scratch, d0); + return; + } + // If only one is, copy that source first. + std::swap(s0, s1); + std::swap(d0, d1); + } + + if (s0 != d0) { + move32(s0, d0); + } + if (s1 != d1) { + move32(s1, d1); + } +} + +void MacroAssembler::moveValue(const Value& src, const ValueOperand& dest) { + move32(Imm32(src.toNunboxTag()), dest.typeReg()); + if (src.isGCThing()) { + movePtr(ImmGCPtr(src.toGCThing()), dest.payloadReg()); + } else { + move32(Imm32(src.toNunboxPayload()), dest.payloadReg()); + } +} + +// =============================================================== +// Branch functions + +void MacroAssembler::branchValueIsNurseryCell(Condition cond, + const Address& address, + Register temp, Label* label) { + MOZ_ASSERT(cond == Assembler::Equal || cond == Assembler::NotEqual); + + Label done; + + branchTestGCThing(Assembler::NotEqual, address, + cond == Assembler::Equal ? &done : label); + + loadPtr(address, temp); + branchPtrInNurseryChunk(cond, temp, InvalidReg, label); + + bind(&done); +} + +void MacroAssembler::branchValueIsNurseryCell(Condition cond, + ValueOperand value, Register temp, + Label* label) { + MOZ_ASSERT(cond == Assembler::Equal || cond == Assembler::NotEqual); + + Label done; + + branchTestGCThing(Assembler::NotEqual, value, + cond == Assembler::Equal ? &done : label); + branchPtrInNurseryChunk(cond, value.payloadReg(), temp, label); + + bind(&done); +} + +void MacroAssembler::branchTestValue(Condition cond, const ValueOperand& lhs, + const Value& rhs, Label* label) { + MOZ_ASSERT(cond == Equal || cond == NotEqual); + ScratchRegisterScope scratch(*this); + moveData(rhs, scratch); + + if (cond == Equal) { + Label done; + ma_b(lhs.payloadReg(), scratch, &done, NotEqual, ShortJump); + { ma_b(lhs.typeReg(), Imm32(getType(rhs)), label, Equal); } + bind(&done); + } else { + ma_b(lhs.payloadReg(), scratch, label, NotEqual); + + ma_b(lhs.typeReg(), Imm32(getType(rhs)), label, NotEqual); + } +} + +// ======================================================================== +// Memory access primitives. +template <typename T> +void MacroAssembler::storeUnboxedValue(const ConstantOrRegister& value, + MIRType valueType, const T& dest, + MIRType slotType) { + if (valueType == MIRType::Double) { + storeDouble(value.reg().typedReg().fpu(), dest); + return; + } + + // Store the type tag if needed. + if (valueType != slotType) { + storeTypeTag(ImmType(ValueTypeFromMIRType(valueType)), dest); + } + + // Store the payload. + if (value.constant()) { + storePayload(value.value(), dest); + } else { + storePayload(value.reg().typedReg().gpr(), dest); + } +} + +template void MacroAssembler::storeUnboxedValue(const ConstantOrRegister& value, + MIRType valueType, + const Address& dest, + MIRType slotType); +template void MacroAssembler::storeUnboxedValue( + const ConstantOrRegister& value, MIRType valueType, + const BaseObjectElementIndex& dest, MIRType slotType); + +void MacroAssembler::PushBoxed(FloatRegister reg) { Push(reg); } + +void MacroAssembler::wasmBoundsCheck32(Condition cond, Register index, + Register boundsCheckLimit, + Label* label) { + ma_b(index, boundsCheckLimit, label, cond); +} + +void MacroAssembler::wasmBoundsCheck32(Condition cond, Register index, + Address boundsCheckLimit, Label* label) { + SecondScratchRegisterScope scratch2(*this); + load32(boundsCheckLimit, SecondScratchReg); + ma_b(index, SecondScratchReg, label, cond); +} + +void MacroAssembler::wasmTruncateDoubleToUInt32(FloatRegister input, + Register output, + bool isSaturating, + Label* oolEntry) { + Label done; + + as_truncwd(ScratchFloat32Reg, input); + ma_li(ScratchRegister, Imm32(INT32_MAX)); + moveFromFloat32(ScratchFloat32Reg, output); + + // For numbers in -1.[ : ]INT32_MAX range do nothing more + ma_b(output, ScratchRegister, &done, Assembler::Below, ShortJump); + + loadConstantDouble(double(INT32_MAX + 1ULL), ScratchDoubleReg); + ma_li(ScratchRegister, Imm32(INT32_MIN)); + as_subd(ScratchDoubleReg, input, ScratchDoubleReg); + as_truncwd(ScratchFloat32Reg, ScratchDoubleReg); + as_cfc1(SecondScratchReg, Assembler::FCSR); + moveFromFloat32(ScratchFloat32Reg, output); + ma_ext(SecondScratchReg, SecondScratchReg, Assembler::CauseV, 1); + ma_addu(output, ScratchRegister); + + ma_b(SecondScratchReg, Imm32(0), oolEntry, Assembler::NotEqual); + + bind(&done); +} + +void MacroAssembler::wasmTruncateFloat32ToUInt32(FloatRegister input, + Register output, + bool isSaturating, + Label* oolEntry) { + Label done; + + as_truncws(ScratchFloat32Reg, input); + ma_li(ScratchRegister, Imm32(INT32_MAX)); + moveFromFloat32(ScratchFloat32Reg, output); + // For numbers in -1.[ : ]INT32_MAX range do nothing more + ma_b(output, ScratchRegister, &done, Assembler::Below, ShortJump); + + loadConstantFloat32(float(INT32_MAX + 1ULL), ScratchFloat32Reg); + ma_li(ScratchRegister, Imm32(INT32_MIN)); + as_subs(ScratchFloat32Reg, input, ScratchFloat32Reg); + as_truncws(ScratchFloat32Reg, ScratchFloat32Reg); + as_cfc1(SecondScratchReg, Assembler::FCSR); + moveFromFloat32(ScratchFloat32Reg, output); + ma_ext(SecondScratchReg, SecondScratchReg, Assembler::CauseV, 1); + ma_addu(output, ScratchRegister); + + // Guard against negative values that result in 0 due the precision loss. + as_sltiu(ScratchRegister, output, 1); + ma_or(SecondScratchReg, ScratchRegister); + + ma_b(SecondScratchReg, Imm32(0), oolEntry, Assembler::NotEqual); + + bind(&done); +} + +void MacroAssembler::wasmLoadI64(const wasm::MemoryAccessDesc& access, + Register memoryBase, Register ptr, + Register ptrScratch, Register64 output) { + wasmLoadI64Impl(access, memoryBase, ptr, ptrScratch, output, InvalidReg); +} + +void MacroAssembler::wasmUnalignedLoadI64(const wasm::MemoryAccessDesc& access, + Register memoryBase, Register ptr, + Register ptrScratch, + Register64 output, Register tmp) { + wasmLoadI64Impl(access, memoryBase, ptr, ptrScratch, output, tmp); +} + +void MacroAssembler::wasmStoreI64(const wasm::MemoryAccessDesc& access, + Register64 value, Register memoryBase, + Register ptr, Register ptrScratch) { + wasmStoreI64Impl(access, value, memoryBase, ptr, ptrScratch, InvalidReg); +} + +void MacroAssembler::wasmUnalignedStoreI64(const wasm::MemoryAccessDesc& access, + Register64 value, + Register memoryBase, Register ptr, + Register ptrScratch, Register tmp) { + wasmStoreI64Impl(access, value, memoryBase, ptr, ptrScratch, tmp); +} + +void MacroAssemblerMIPSCompat::wasmLoadI64Impl( + const wasm::MemoryAccessDesc& access, Register memoryBase, Register ptr, + Register ptrScratch, Register64 output, Register tmp) { + uint32_t offset = access.offset(); + MOZ_ASSERT_IF(offset, ptrScratch != InvalidReg); + + MOZ_ASSERT(!access.isZeroExtendSimd128Load()); + MOZ_ASSERT(!access.isSplatSimd128Load()); + MOZ_ASSERT(!access.isWidenSimd128Load()); + + // Maybe add the offset. + if (offset) { + asMasm().movePtr(ptr, ptrScratch); + asMasm().addPtr(Imm32(offset), ptrScratch); + ptr = ptrScratch; + } + + unsigned byteSize = access.byteSize(); + bool isSigned; + + switch (access.type()) { + case Scalar::Int8: + isSigned = true; + break; + case Scalar::Uint8: + isSigned = false; + break; + case Scalar::Int16: + isSigned = true; + break; + case Scalar::Uint16: + isSigned = false; + break; + case Scalar::Int32: + isSigned = true; + break; + case Scalar::Uint32: + isSigned = false; + break; + case Scalar::Int64: + isSigned = true; + break; + default: + MOZ_CRASH("unexpected array type"); + } + + BaseIndex address(memoryBase, ptr, TimesOne); + MOZ_ASSERT(INT64LOW_OFFSET == 0); + if (IsUnaligned(access)) { + MOZ_ASSERT(tmp != InvalidReg); + if (byteSize <= 4) { + asMasm().ma_load_unaligned(access, output.low, address, tmp, + static_cast<LoadStoreSize>(8 * byteSize), + isSigned ? SignExtend : ZeroExtend); + if (!isSigned) { + asMasm().move32(Imm32(0), output.high); + } else { + asMasm().ma_sra(output.high, output.low, Imm32(31)); + } + } else { + MOZ_ASSERT(output.low != ptr); + asMasm().ma_load_unaligned(access, output.low, address, tmp, SizeWord, + ZeroExtend); + asMasm().ma_load_unaligned( + access, output.high, + BaseIndex(HeapReg, ptr, TimesOne, INT64HIGH_OFFSET), tmp, SizeWord, + SignExtend); + } + return; + } + + asMasm().memoryBarrierBefore(access.sync()); + if (byteSize <= 4) { + asMasm().ma_load(output.low, address, + static_cast<LoadStoreSize>(8 * byteSize), + isSigned ? SignExtend : ZeroExtend); + asMasm().append(access, asMasm().size() - 4); + if (!isSigned) { + asMasm().move32(Imm32(0), output.high); + } else { + asMasm().ma_sra(output.high, output.low, Imm32(31)); + } + } else { + MOZ_ASSERT(output.low != ptr); + asMasm().ma_load(output.low, BaseIndex(HeapReg, ptr, TimesOne), SizeWord); + asMasm().append(access, asMasm().size() - 4); + asMasm().ma_load(output.high, + BaseIndex(HeapReg, ptr, TimesOne, INT64HIGH_OFFSET), + SizeWord); + asMasm().append(access, asMasm().size() - 4); + } + asMasm().memoryBarrierAfter(access.sync()); +} + +void MacroAssemblerMIPSCompat::wasmStoreI64Impl( + const wasm::MemoryAccessDesc& access, Register64 value, Register memoryBase, + Register ptr, Register ptrScratch, Register tmp) { + uint32_t offset = access.offset(); + MOZ_ASSERT(offset < asMasm().wasmMaxOffsetGuardLimit()); + MOZ_ASSERT_IF(offset, ptrScratch != InvalidReg); + + // Maybe add the offset. + if (offset) { + asMasm().addPtr(Imm32(offset), ptrScratch); + ptr = ptrScratch; + } + + unsigned byteSize = access.byteSize(); + bool isSigned; + switch (access.type()) { + case Scalar::Int8: + isSigned = true; + break; + case Scalar::Uint8: + isSigned = false; + break; + case Scalar::Int16: + isSigned = true; + break; + case Scalar::Uint16: + isSigned = false; + break; + case Scalar::Int32: + isSigned = true; + break; + case Scalar::Uint32: + isSigned = false; + break; + case Scalar::Int64: + isSigned = true; + break; + default: + MOZ_CRASH("unexpected array type"); + } + + MOZ_ASSERT(INT64LOW_OFFSET == 0); + BaseIndex address(memoryBase, ptr, TimesOne); + if (IsUnaligned(access)) { + MOZ_ASSERT(tmp != InvalidReg); + if (byteSize <= 4) { + asMasm().ma_store_unaligned(access, value.low, address, tmp, + static_cast<LoadStoreSize>(8 * byteSize), + isSigned ? SignExtend : ZeroExtend); + } else { + asMasm().ma_store_unaligned( + access, value.high, + BaseIndex(HeapReg, ptr, TimesOne, INT64HIGH_OFFSET), tmp, SizeWord, + SignExtend); + asMasm().ma_store_unaligned(access, value.low, address, tmp, SizeWord, + ZeroExtend); + } + return; + } + + asMasm().memoryBarrierBefore(access.sync()); + if (byteSize <= 4) { + asMasm().ma_store(value.low, address, + static_cast<LoadStoreSize>(8 * byteSize)); + asMasm().append(access, asMasm().size() - 4); + } else { + asMasm().ma_store(value.high, + BaseIndex(HeapReg, ptr, TimesOne, INT64HIGH_OFFSET), + SizeWord); + asMasm().append(access, asMasm().size() - 4); + asMasm().ma_store(value.low, address, SizeWord); + } + asMasm().memoryBarrierAfter(access.sync()); +} + +static void EnterAtomic64Region(MacroAssembler& masm, + const wasm::MemoryAccessDesc& access, + Register addr, Register spinlock, + Register scratch) { + masm.movePtr(wasm::SymbolicAddress::js_jit_gAtomic64Lock, spinlock); + + masm.append(access, masm.size()); + masm.as_lbu( + zero, addr, + 7); // Force memory trap on invalid access before we enter the spinlock. + + Label tryLock; + + masm.memoryBarrier(MembarFull); + + masm.bind(&tryLock); + + masm.as_ll(scratch, spinlock, 0); + masm.ma_b(scratch, scratch, &tryLock, Assembler::NonZero, ShortJump); + masm.ma_li(scratch, Imm32(1)); + masm.as_sc(scratch, spinlock, 0); + masm.ma_b(scratch, scratch, &tryLock, Assembler::Zero, ShortJump); + + masm.memoryBarrier(MembarFull); +} + +static void ExitAtomic64Region(MacroAssembler& masm, Register spinlock) { + masm.memoryBarrier(MembarFull); + masm.as_sw(zero, spinlock, 0); + masm.memoryBarrier(MembarFull); +} + +template <typename T> +static void AtomicLoad64(MacroAssembler& masm, + const wasm::MemoryAccessDesc& access, const T& mem, + Register64 temp, Register64 output) { + MOZ_ASSERT(temp.low == InvalidReg && temp.high == InvalidReg); + + masm.computeEffectiveAddress(mem, SecondScratchReg); + + EnterAtomic64Region(masm, access, /* addr= */ SecondScratchReg, + /* spinlock= */ ScratchRegister, + /* scratch= */ output.low); + + masm.load64(Address(SecondScratchReg, 0), output); + + ExitAtomic64Region(masm, /* spinlock= */ ScratchRegister); +} + +void MacroAssembler::wasmAtomicLoad64(const wasm::MemoryAccessDesc& access, + const Address& mem, Register64 temp, + Register64 output) { + AtomicLoad64(*this, access, mem, temp, output); +} + +void MacroAssembler::wasmAtomicLoad64(const wasm::MemoryAccessDesc& access, + const BaseIndex& mem, Register64 temp, + Register64 output) { + AtomicLoad64(*this, access, mem, temp, output); +} + +template <typename T> +void MacroAssemblerMIPSCompat::wasmAtomicStore64( + const wasm::MemoryAccessDesc& access, const T& mem, Register temp, + Register64 value) { + computeEffectiveAddress(mem, SecondScratchReg); + + EnterAtomic64Region(asMasm(), access, /* addr= */ SecondScratchReg, + /* spinlock= */ ScratchRegister, /* scratch= */ temp); + + store64(value, Address(SecondScratchReg, 0)); + + ExitAtomic64Region(asMasm(), /* spinlock= */ ScratchRegister); +} + +template void MacroAssemblerMIPSCompat::wasmAtomicStore64( + const wasm::MemoryAccessDesc& access, const Address& mem, Register temp, + Register64 value); +template void MacroAssemblerMIPSCompat::wasmAtomicStore64( + const wasm::MemoryAccessDesc& access, const BaseIndex& mem, Register temp, + Register64 value); + +template <typename T> +static void WasmCompareExchange64(MacroAssembler& masm, + const wasm::MemoryAccessDesc& access, + const T& mem, Register64 expect, + Register64 replace, Register64 output) { + MOZ_ASSERT(output != expect); + MOZ_ASSERT(output != replace); + + Label exit; + + masm.computeEffectiveAddress(mem, SecondScratchReg); + Address addr(SecondScratchReg, 0); + + EnterAtomic64Region(masm, access, /* addr= */ SecondScratchReg, + /* spinlock= */ ScratchRegister, + /* scratch= */ output.low); + + masm.load64(addr, output); + + masm.ma_b(output.low, expect.low, &exit, Assembler::NotEqual, ShortJump); + masm.ma_b(output.high, expect.high, &exit, Assembler::NotEqual, ShortJump); + masm.store64(replace, addr); + masm.bind(&exit); + ExitAtomic64Region(masm, /* spinlock= */ ScratchRegister); +} + +void MacroAssembler::wasmCompareExchange64(const wasm::MemoryAccessDesc& access, + const Address& mem, + Register64 expect, + Register64 replace, + Register64 output) { + WasmCompareExchange64(*this, access, mem, expect, replace, output); +} + +void MacroAssembler::wasmCompareExchange64(const wasm::MemoryAccessDesc& access, + const BaseIndex& mem, + Register64 expect, + Register64 replace, + Register64 output) { + WasmCompareExchange64(*this, access, mem, expect, replace, output); +} + +template <typename T> +static void WasmAtomicExchange64(MacroAssembler& masm, + const wasm::MemoryAccessDesc& access, + const T& mem, Register64 src, + Register64 output) { + masm.computeEffectiveAddress(mem, SecondScratchReg); + Address addr(SecondScratchReg, 0); + + EnterAtomic64Region(masm, access, /* addr= */ SecondScratchReg, + /* spinlock= */ ScratchRegister, + /* scratch= */ output.low); + + masm.load64(addr, output); + masm.store64(src, addr); + + ExitAtomic64Region(masm, /* spinlock= */ ScratchRegister); +} + +void MacroAssembler::wasmAtomicExchange64(const wasm::MemoryAccessDesc& access, + const Address& mem, Register64 src, + Register64 output) { + WasmAtomicExchange64(*this, access, mem, src, output); +} + +void MacroAssembler::wasmAtomicExchange64(const wasm::MemoryAccessDesc& access, + const BaseIndex& mem, Register64 src, + Register64 output) { + WasmAtomicExchange64(*this, access, mem, src, output); +} + +template <typename T> +static void AtomicFetchOp64(MacroAssembler& masm, + const wasm::MemoryAccessDesc& access, AtomicOp op, + Register64 value, const T& mem, Register64 temp, + Register64 output) { + masm.computeEffectiveAddress(mem, SecondScratchReg); + + EnterAtomic64Region(masm, access, /* addr= */ SecondScratchReg, + /* spinlock= */ ScratchRegister, + /* scratch= */ output.low); + + masm.load64(Address(SecondScratchReg, 0), output); + + switch (op) { + case AtomicFetchAddOp: + masm.as_addu(temp.low, output.low, value.low); + masm.as_sltu(temp.high, temp.low, output.low); + masm.as_addu(temp.high, temp.high, output.high); + masm.as_addu(temp.high, temp.high, value.high); + break; + case AtomicFetchSubOp: + masm.as_sltu(temp.high, output.low, value.low); + masm.as_subu(temp.high, output.high, temp.high); + masm.as_subu(temp.low, output.low, value.low); + masm.as_subu(temp.high, temp.high, value.high); + break; + case AtomicFetchAndOp: + masm.as_and(temp.low, output.low, value.low); + masm.as_and(temp.high, output.high, value.high); + break; + case AtomicFetchOrOp: + masm.as_or(temp.low, output.low, value.low); + masm.as_or(temp.high, output.high, value.high); + break; + case AtomicFetchXorOp: + masm.as_xor(temp.low, output.low, value.low); + masm.as_xor(temp.high, output.high, value.high); + break; + default: + MOZ_CRASH(); + } + + masm.store64(temp, Address(SecondScratchReg, 0)); + + ExitAtomic64Region(masm, /* spinlock= */ ScratchRegister); +} + +void MacroAssembler::wasmAtomicFetchOp64(const wasm::MemoryAccessDesc& access, + AtomicOp op, Register64 value, + const Address& mem, Register64 temp, + Register64 output) { + AtomicFetchOp64(*this, access, op, value, mem, temp, output); +} + +void MacroAssembler::wasmAtomicFetchOp64(const wasm::MemoryAccessDesc& access, + AtomicOp op, Register64 value, + const BaseIndex& mem, Register64 temp, + Register64 output) { + AtomicFetchOp64(*this, access, op, value, mem, temp, output); +} + +// ======================================================================== +// Convert floating point. + +static const double TO_DOUBLE_HIGH_SCALE = 0x100000000; + +bool MacroAssembler::convertUInt64ToDoubleNeedsTemp() { return false; } + +void MacroAssembler::convertUInt64ToDouble(Register64 src, FloatRegister dest, + Register temp) { + MOZ_ASSERT(temp == Register::Invalid()); + convertUInt32ToDouble(src.high, dest); + loadConstantDouble(TO_DOUBLE_HIGH_SCALE, ScratchDoubleReg); + mulDouble(ScratchDoubleReg, dest); + convertUInt32ToDouble(src.low, ScratchDoubleReg); + addDouble(ScratchDoubleReg, dest); +} + +void MacroAssembler::convertInt64ToDouble(Register64 src, FloatRegister dest) { + convertInt32ToDouble(src.high, dest); + loadConstantDouble(TO_DOUBLE_HIGH_SCALE, ScratchDoubleReg); + mulDouble(ScratchDoubleReg, dest); + convertUInt32ToDouble(src.low, ScratchDoubleReg); + addDouble(ScratchDoubleReg, dest); +} + +//}}} check_macroassembler_style |