| /* |
| * Copyright (C) 2009-2017 Apple Inc. All rights reserved. |
| * Copyright (C) 2010 University of Szeged |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
| * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #pragma once |
| |
| #if ENABLE(ASSEMBLER) |
| |
| #include "ARMv7Assembler.h" |
| #include "AbstractMacroAssembler.h" |
| |
| namespace JSC { |
| |
| class MacroAssemblerARMv7 : public AbstractMacroAssembler<ARMv7Assembler, MacroAssemblerARMv7> { |
| static const RegisterID dataTempRegister = ARMRegisters::ip; |
| static const RegisterID addressTempRegister = ARMRegisters::r6; |
| |
| static const ARMRegisters::FPDoubleRegisterID fpTempRegister = ARMRegisters::d7; |
| inline ARMRegisters::FPSingleRegisterID fpTempRegisterAsSingle() { return ARMRegisters::asSingle(fpTempRegister); } |
| |
| public: |
| static const unsigned numGPRs = 16; |
| static const unsigned numFPRs = 16; |
| |
| MacroAssemblerARMv7() |
| : m_makeJumpPatchable(false) |
| { |
| } |
| |
| typedef ARMv7Assembler::LinkRecord LinkRecord; |
| typedef ARMv7Assembler::JumpType JumpType; |
| typedef ARMv7Assembler::JumpLinkType JumpLinkType; |
| typedef ARMv7Assembler::Condition Condition; |
| |
| static const ARMv7Assembler::Condition DefaultCondition = ARMv7Assembler::ConditionInvalid; |
| static const ARMv7Assembler::JumpType DefaultJump = ARMv7Assembler::JumpNoConditionFixedSize; |
| |
| static bool isCompactPtrAlignedAddressOffset(ptrdiff_t value) |
| { |
| return value >= -255 && value <= 255; |
| } |
| |
| Vector<LinkRecord, 0, UnsafeVectorOverflow>& jumpsToLink() { return m_assembler.jumpsToLink(); } |
| void* unlinkedCode() { return m_assembler.unlinkedCode(); } |
| static bool canCompact(JumpType jumpType) { return ARMv7Assembler::canCompact(jumpType); } |
| static JumpLinkType computeJumpType(JumpType jumpType, const uint8_t* from, const uint8_t* to) { return ARMv7Assembler::computeJumpType(jumpType, from, to); } |
| static JumpLinkType computeJumpType(LinkRecord& record, const uint8_t* from, const uint8_t* to) { return ARMv7Assembler::computeJumpType(record, from, to); } |
| static int jumpSizeDelta(JumpType jumpType, JumpLinkType jumpLinkType) { return ARMv7Assembler::jumpSizeDelta(jumpType, jumpLinkType); } |
| static void link(LinkRecord& record, uint8_t* from, const uint8_t* fromInstruction, uint8_t* to) { return ARMv7Assembler::link(record, from, fromInstruction, to); } |
| |
| struct ArmAddress { |
| enum AddressType { |
| HasOffset, |
| HasIndex, |
| } type; |
| RegisterID base; |
| union { |
| int32_t offset; |
| struct { |
| RegisterID index; |
| Scale scale; |
| }; |
| } u; |
| |
| explicit ArmAddress(RegisterID base, int32_t offset = 0) |
| : type(HasOffset) |
| , base(base) |
| { |
| u.offset = offset; |
| } |
| |
| explicit ArmAddress(RegisterID base, RegisterID index, Scale scale = TimesOne) |
| : type(HasIndex) |
| , base(base) |
| { |
| u.index = index; |
| u.scale = scale; |
| } |
| }; |
| |
| public: |
| static const Scale ScalePtr = TimesFour; |
| |
| enum RelationalCondition { |
| Equal = ARMv7Assembler::ConditionEQ, |
| NotEqual = ARMv7Assembler::ConditionNE, |
| Above = ARMv7Assembler::ConditionHI, |
| AboveOrEqual = ARMv7Assembler::ConditionHS, |
| Below = ARMv7Assembler::ConditionLO, |
| BelowOrEqual = ARMv7Assembler::ConditionLS, |
| GreaterThan = ARMv7Assembler::ConditionGT, |
| GreaterThanOrEqual = ARMv7Assembler::ConditionGE, |
| LessThan = ARMv7Assembler::ConditionLT, |
| LessThanOrEqual = ARMv7Assembler::ConditionLE |
| }; |
| |
| enum ResultCondition { |
| Overflow = ARMv7Assembler::ConditionVS, |
| Signed = ARMv7Assembler::ConditionMI, |
| PositiveOrZero = ARMv7Assembler::ConditionPL, |
| Zero = ARMv7Assembler::ConditionEQ, |
| NonZero = ARMv7Assembler::ConditionNE |
| }; |
| |
| enum DoubleCondition { |
| // These conditions will only evaluate to true if the comparison is ordered - i.e. neither operand is NaN. |
| DoubleEqual = ARMv7Assembler::ConditionEQ, |
| DoubleNotEqual = ARMv7Assembler::ConditionVC, // Not the right flag! check for this & handle differently. |
| DoubleGreaterThan = ARMv7Assembler::ConditionGT, |
| DoubleGreaterThanOrEqual = ARMv7Assembler::ConditionGE, |
| DoubleLessThan = ARMv7Assembler::ConditionLO, |
| DoubleLessThanOrEqual = ARMv7Assembler::ConditionLS, |
| // If either operand is NaN, these conditions always evaluate to true. |
| DoubleEqualOrUnordered = ARMv7Assembler::ConditionVS, // Not the right flag! check for this & handle differently. |
| DoubleNotEqualOrUnordered = ARMv7Assembler::ConditionNE, |
| DoubleGreaterThanOrUnordered = ARMv7Assembler::ConditionHI, |
| DoubleGreaterThanOrEqualOrUnordered = ARMv7Assembler::ConditionHS, |
| DoubleLessThanOrUnordered = ARMv7Assembler::ConditionLT, |
| DoubleLessThanOrEqualOrUnordered = ARMv7Assembler::ConditionLE, |
| }; |
| |
| static const RegisterID stackPointerRegister = ARMRegisters::sp; |
| static const RegisterID framePointerRegister = ARMRegisters::fp; |
| static const RegisterID linkRegister = ARMRegisters::lr; |
| |
| // Integer arithmetic operations: |
| // |
| // Operations are typically two operand - operation(source, srcDst) |
| // For many operations the source may be an TrustedImm32, the srcDst operand |
| // may often be a memory location (explictly described using an Address |
| // object). |
| |
| void add32(RegisterID src, RegisterID dest) |
| { |
| m_assembler.add(dest, dest, src); |
| } |
| |
| void add32(RegisterID left, RegisterID right, RegisterID dest) |
| { |
| m_assembler.add(dest, left, right); |
| } |
| |
| void add32(TrustedImm32 imm, RegisterID dest) |
| { |
| add32(imm, dest, dest); |
| } |
| |
| void add32(AbsoluteAddress src, RegisterID dest) |
| { |
| load32(src.m_ptr, dataTempRegister); |
| add32(dataTempRegister, dest); |
| } |
| |
| void add32(TrustedImm32 imm, RegisterID src, RegisterID dest) |
| { |
| ARMThumbImmediate armImm = ARMThumbImmediate::makeUInt12OrEncodedImm(imm.m_value); |
| |
| // For adds with stack pointer destination, moving the src first to sp is |
| // needed to avoid unpredictable instruction |
| if (dest == ARMRegisters::sp && src != dest) { |
| move(src, ARMRegisters::sp); |
| src = ARMRegisters::sp; |
| } |
| |
| if (armImm.isValid()) |
| m_assembler.add(dest, src, armImm); |
| else { |
| move(imm, dataTempRegister); |
| m_assembler.add(dest, src, dataTempRegister); |
| } |
| } |
| |
| void add32(TrustedImm32 imm, Address address) |
| { |
| load32(address, dataTempRegister); |
| |
| ARMThumbImmediate armImm = ARMThumbImmediate::makeUInt12OrEncodedImm(imm.m_value); |
| if (armImm.isValid()) |
| m_assembler.add(dataTempRegister, dataTempRegister, armImm); |
| else { |
| // Hrrrm, since dataTempRegister holds the data loaded, |
| // use addressTempRegister to hold the immediate. |
| move(imm, addressTempRegister); |
| m_assembler.add(dataTempRegister, dataTempRegister, addressTempRegister); |
| } |
| |
| store32(dataTempRegister, address); |
| } |
| |
| void add32(Address src, RegisterID dest) |
| { |
| load32(src, dataTempRegister); |
| add32(dataTempRegister, dest); |
| } |
| |
| void add32(TrustedImm32 imm, AbsoluteAddress address) |
| { |
| load32(address.m_ptr, dataTempRegister); |
| |
| ARMThumbImmediate armImm = ARMThumbImmediate::makeUInt12OrEncodedImm(imm.m_value); |
| if (armImm.isValid()) |
| m_assembler.add(dataTempRegister, dataTempRegister, armImm); |
| else { |
| // Hrrrm, since dataTempRegister holds the data loaded, |
| // use addressTempRegister to hold the immediate. |
| move(imm, addressTempRegister); |
| m_assembler.add(dataTempRegister, dataTempRegister, addressTempRegister); |
| } |
| |
| store32(dataTempRegister, address.m_ptr); |
| } |
| |
| void addPtrNoFlags(TrustedImm32 imm, RegisterID srcDest) |
| { |
| add32(imm, srcDest); |
| } |
| |
| void add64(TrustedImm32 imm, AbsoluteAddress address) |
| { |
| move(TrustedImmPtr(address.m_ptr), addressTempRegister); |
| |
| m_assembler.ldr(dataTempRegister, addressTempRegister, ARMThumbImmediate::makeUInt12(0)); |
| ARMThumbImmediate armImm = ARMThumbImmediate::makeEncodedImm(imm.m_value); |
| if (armImm.isValid()) |
| m_assembler.add_S(dataTempRegister, dataTempRegister, armImm); |
| else { |
| move(imm, addressTempRegister); |
| m_assembler.add_S(dataTempRegister, dataTempRegister, addressTempRegister); |
| move(TrustedImmPtr(address.m_ptr), addressTempRegister); |
| } |
| m_assembler.str(dataTempRegister, addressTempRegister, ARMThumbImmediate::makeUInt12(0)); |
| |
| m_assembler.ldr(dataTempRegister, addressTempRegister, ARMThumbImmediate::makeUInt12(4)); |
| m_assembler.adc(dataTempRegister, dataTempRegister, ARMThumbImmediate::makeEncodedImm(imm.m_value >> 31)); |
| m_assembler.str(dataTempRegister, addressTempRegister, ARMThumbImmediate::makeUInt12(4)); |
| } |
| |
| void and32(RegisterID op1, RegisterID op2, RegisterID dest) |
| { |
| m_assembler.ARM_and(dest, op1, op2); |
| } |
| |
| void and32(TrustedImm32 imm, RegisterID src, RegisterID dest) |
| { |
| ARMThumbImmediate armImm = ARMThumbImmediate::makeEncodedImm(imm.m_value); |
| if (armImm.isValid()) |
| m_assembler.ARM_and(dest, src, armImm); |
| else { |
| move(imm, dataTempRegister); |
| m_assembler.ARM_and(dest, src, dataTempRegister); |
| } |
| } |
| |
| void and32(RegisterID src, RegisterID dest) |
| { |
| and32(dest, src, dest); |
| } |
| |
| void and32(TrustedImm32 imm, RegisterID dest) |
| { |
| and32(imm, dest, dest); |
| } |
| |
| void and32(Address src, RegisterID dest) |
| { |
| load32(src, dataTempRegister); |
| and32(dataTempRegister, dest); |
| } |
| |
| void countLeadingZeros32(RegisterID src, RegisterID dest) |
| { |
| m_assembler.clz(dest, src); |
| } |
| |
| void lshift32(RegisterID src, RegisterID shiftAmount, RegisterID dest) |
| { |
| // Clamp the shift to the range 0..31 |
| ARMThumbImmediate armImm = ARMThumbImmediate::makeEncodedImm(0x1f); |
| ASSERT(armImm.isValid()); |
| m_assembler.ARM_and(dataTempRegister, shiftAmount, armImm); |
| |
| m_assembler.lsl(dest, src, dataTempRegister); |
| } |
| |
| void lshift32(RegisterID src, TrustedImm32 imm, RegisterID dest) |
| { |
| m_assembler.lsl(dest, src, imm.m_value & 0x1f); |
| } |
| |
| void lshift32(RegisterID shiftAmount, RegisterID dest) |
| { |
| lshift32(dest, shiftAmount, dest); |
| } |
| |
| void lshift32(TrustedImm32 imm, RegisterID dest) |
| { |
| lshift32(dest, imm, dest); |
| } |
| |
| void mul32(RegisterID src, RegisterID dest) |
| { |
| m_assembler.smull(dest, dataTempRegister, dest, src); |
| } |
| |
| void mul32(RegisterID left, RegisterID right, RegisterID dest) |
| { |
| m_assembler.smull(dest, dataTempRegister, left, right); |
| } |
| |
| void mul32(TrustedImm32 imm, RegisterID src, RegisterID dest) |
| { |
| move(imm, dataTempRegister); |
| m_assembler.smull(dest, dataTempRegister, src, dataTempRegister); |
| } |
| |
| void neg32(RegisterID srcDest) |
| { |
| m_assembler.neg(srcDest, srcDest); |
| } |
| |
| void or32(RegisterID src, RegisterID dest) |
| { |
| m_assembler.orr(dest, dest, src); |
| } |
| |
| void or32(RegisterID src, AbsoluteAddress dest) |
| { |
| move(TrustedImmPtr(dest.m_ptr), addressTempRegister); |
| load32(addressTempRegister, dataTempRegister); |
| or32(src, dataTempRegister); |
| store32(dataTempRegister, addressTempRegister); |
| } |
| |
| void or32(TrustedImm32 imm, AbsoluteAddress address) |
| { |
| ARMThumbImmediate armImm = ARMThumbImmediate::makeEncodedImm(imm.m_value); |
| if (armImm.isValid()) { |
| move(TrustedImmPtr(address.m_ptr), addressTempRegister); |
| load32(addressTempRegister, dataTempRegister); |
| m_assembler.orr(dataTempRegister, dataTempRegister, armImm); |
| store32(dataTempRegister, addressTempRegister); |
| } else { |
| move(TrustedImmPtr(address.m_ptr), addressTempRegister); |
| load32(addressTempRegister, dataTempRegister); |
| move(imm, addressTempRegister); |
| m_assembler.orr(dataTempRegister, dataTempRegister, addressTempRegister); |
| move(TrustedImmPtr(address.m_ptr), addressTempRegister); |
| store32(dataTempRegister, addressTempRegister); |
| } |
| } |
| |
| void or32(TrustedImm32 imm, Address address) |
| { |
| load32(address, dataTempRegister); |
| or32(imm, dataTempRegister, dataTempRegister); |
| store32(dataTempRegister, address); |
| } |
| |
| void or32(TrustedImm32 imm, RegisterID dest) |
| { |
| or32(imm, dest, dest); |
| } |
| |
| void or32(RegisterID op1, RegisterID op2, RegisterID dest) |
| { |
| m_assembler.orr(dest, op1, op2); |
| } |
| |
| void or32(TrustedImm32 imm, RegisterID src, RegisterID dest) |
| { |
| ARMThumbImmediate armImm = ARMThumbImmediate::makeEncodedImm(imm.m_value); |
| if (armImm.isValid()) |
| m_assembler.orr(dest, src, armImm); |
| else { |
| ASSERT(src != dataTempRegister); |
| move(imm, dataTempRegister); |
| m_assembler.orr(dest, src, dataTempRegister); |
| } |
| } |
| |
| void rshift32(RegisterID src, RegisterID shiftAmount, RegisterID dest) |
| { |
| // Clamp the shift to the range 0..31 |
| ARMThumbImmediate armImm = ARMThumbImmediate::makeEncodedImm(0x1f); |
| ASSERT(armImm.isValid()); |
| m_assembler.ARM_and(dataTempRegister, shiftAmount, armImm); |
| |
| m_assembler.asr(dest, src, dataTempRegister); |
| } |
| |
| void rshift32(RegisterID src, TrustedImm32 imm, RegisterID dest) |
| { |
| if (!imm.m_value) |
| move(src, dest); |
| else |
| m_assembler.asr(dest, src, imm.m_value & 0x1f); |
| } |
| |
| void rshift32(RegisterID shiftAmount, RegisterID dest) |
| { |
| rshift32(dest, shiftAmount, dest); |
| } |
| |
| void rshift32(TrustedImm32 imm, RegisterID dest) |
| { |
| rshift32(dest, imm, dest); |
| } |
| |
| void urshift32(RegisterID src, RegisterID shiftAmount, RegisterID dest) |
| { |
| // Clamp the shift to the range 0..31 |
| ARMThumbImmediate armImm = ARMThumbImmediate::makeEncodedImm(0x1f); |
| ASSERT(armImm.isValid()); |
| m_assembler.ARM_and(dataTempRegister, shiftAmount, armImm); |
| |
| m_assembler.lsr(dest, src, dataTempRegister); |
| } |
| |
| void urshift32(RegisterID src, TrustedImm32 imm, RegisterID dest) |
| { |
| if (!imm.m_value) |
| move(src, dest); |
| else |
| m_assembler.lsr(dest, src, imm.m_value & 0x1f); |
| } |
| |
| void urshift32(RegisterID shiftAmount, RegisterID dest) |
| { |
| urshift32(dest, shiftAmount, dest); |
| } |
| |
| void urshift32(TrustedImm32 imm, RegisterID dest) |
| { |
| urshift32(dest, imm, dest); |
| } |
| |
| void sub32(RegisterID src, RegisterID dest) |
| { |
| m_assembler.sub(dest, dest, src); |
| } |
| |
| void sub32(RegisterID left, RegisterID right, RegisterID dest) |
| { |
| m_assembler.sub(dest, left, right); |
| } |
| |
| void sub32(TrustedImm32 imm, RegisterID dest) |
| { |
| ARMThumbImmediate armImm = ARMThumbImmediate::makeUInt12OrEncodedImm(imm.m_value); |
| if (armImm.isValid()) |
| m_assembler.sub(dest, dest, armImm); |
| else { |
| move(imm, dataTempRegister); |
| m_assembler.sub(dest, dest, dataTempRegister); |
| } |
| } |
| |
| void sub32(TrustedImm32 imm, Address address) |
| { |
| load32(address, dataTempRegister); |
| |
| ARMThumbImmediate armImm = ARMThumbImmediate::makeUInt12OrEncodedImm(imm.m_value); |
| if (armImm.isValid()) |
| m_assembler.sub(dataTempRegister, dataTempRegister, armImm); |
| else { |
| // Hrrrm, since dataTempRegister holds the data loaded, |
| // use addressTempRegister to hold the immediate. |
| move(imm, addressTempRegister); |
| m_assembler.sub(dataTempRegister, dataTempRegister, addressTempRegister); |
| } |
| |
| store32(dataTempRegister, address); |
| } |
| |
| void sub32(Address src, RegisterID dest) |
| { |
| load32(src, dataTempRegister); |
| sub32(dataTempRegister, dest); |
| } |
| |
| void sub32(TrustedImm32 imm, AbsoluteAddress address) |
| { |
| load32(address.m_ptr, dataTempRegister); |
| |
| ARMThumbImmediate armImm = ARMThumbImmediate::makeUInt12OrEncodedImm(imm.m_value); |
| if (armImm.isValid()) |
| m_assembler.sub(dataTempRegister, dataTempRegister, armImm); |
| else { |
| // Hrrrm, since dataTempRegister holds the data loaded, |
| // use addressTempRegister to hold the immediate. |
| move(imm, addressTempRegister); |
| m_assembler.sub(dataTempRegister, dataTempRegister, addressTempRegister); |
| } |
| |
| store32(dataTempRegister, address.m_ptr); |
| } |
| |
| void xor32(RegisterID op1, RegisterID op2, RegisterID dest) |
| { |
| m_assembler.eor(dest, op1, op2); |
| } |
| |
| void xor32(TrustedImm32 imm, RegisterID src, RegisterID dest) |
| { |
| if (imm.m_value == -1) { |
| m_assembler.mvn(dest, src); |
| return; |
| } |
| |
| ARMThumbImmediate armImm = ARMThumbImmediate::makeEncodedImm(imm.m_value); |
| if (armImm.isValid()) |
| m_assembler.eor(dest, src, armImm); |
| else { |
| move(imm, dataTempRegister); |
| m_assembler.eor(dest, src, dataTempRegister); |
| } |
| } |
| |
| void xor32(RegisterID src, RegisterID dest) |
| { |
| xor32(dest, src, dest); |
| } |
| |
| void xor32(TrustedImm32 imm, RegisterID dest) |
| { |
| if (imm.m_value == -1) |
| m_assembler.mvn(dest, dest); |
| else |
| xor32(imm, dest, dest); |
| } |
| |
| |
| // Memory access operations: |
| // |
| // Loads are of the form load(address, destination) and stores of the form |
| // store(source, address). The source for a store may be an TrustedImm32. Address |
| // operand objects to loads and store will be implicitly constructed if a |
| // register is passed. |
| |
| private: |
| void load32(ArmAddress address, RegisterID dest) |
| { |
| if (address.type == ArmAddress::HasIndex) |
| m_assembler.ldr(dest, address.base, address.u.index, address.u.scale); |
| else if (address.u.offset >= 0) { |
| ARMThumbImmediate armImm = ARMThumbImmediate::makeUInt12(address.u.offset); |
| ASSERT(armImm.isValid()); |
| m_assembler.ldr(dest, address.base, armImm); |
| } else { |
| ASSERT(address.u.offset >= -255); |
| m_assembler.ldr(dest, address.base, address.u.offset, true, false); |
| } |
| } |
| |
| void load16(ArmAddress address, RegisterID dest) |
| { |
| if (address.type == ArmAddress::HasIndex) |
| m_assembler.ldrh(dest, address.base, address.u.index, address.u.scale); |
| else if (address.u.offset >= 0) { |
| ARMThumbImmediate armImm = ARMThumbImmediate::makeUInt12(address.u.offset); |
| ASSERT(armImm.isValid()); |
| m_assembler.ldrh(dest, address.base, armImm); |
| } else { |
| ASSERT(address.u.offset >= -255); |
| m_assembler.ldrh(dest, address.base, address.u.offset, true, false); |
| } |
| } |
| |
| void load16SignedExtendTo32(ArmAddress address, RegisterID dest) |
| { |
| ASSERT(address.type == ArmAddress::HasIndex); |
| m_assembler.ldrsh(dest, address.base, address.u.index, address.u.scale); |
| } |
| |
| void load8(ArmAddress address, RegisterID dest) |
| { |
| if (address.type == ArmAddress::HasIndex) |
| m_assembler.ldrb(dest, address.base, address.u.index, address.u.scale); |
| else if (address.u.offset >= 0) { |
| ARMThumbImmediate armImm = ARMThumbImmediate::makeUInt12(address.u.offset); |
| ASSERT(armImm.isValid()); |
| m_assembler.ldrb(dest, address.base, armImm); |
| } else { |
| ASSERT(address.u.offset >= -255); |
| m_assembler.ldrb(dest, address.base, address.u.offset, true, false); |
| } |
| } |
| |
| void load8SignedExtendTo32(ArmAddress address, RegisterID dest) |
| { |
| ASSERT(address.type == ArmAddress::HasIndex); |
| m_assembler.ldrsb(dest, address.base, address.u.index, address.u.scale); |
| } |
| |
| protected: |
| void store32(RegisterID src, ArmAddress address) |
| { |
| if (address.type == ArmAddress::HasIndex) |
| m_assembler.str(src, address.base, address.u.index, address.u.scale); |
| else if (address.u.offset >= 0) { |
| ARMThumbImmediate armImm = ARMThumbImmediate::makeUInt12(address.u.offset); |
| ASSERT(armImm.isValid()); |
| m_assembler.str(src, address.base, armImm); |
| } else { |
| ASSERT(address.u.offset >= -255); |
| m_assembler.str(src, address.base, address.u.offset, true, false); |
| } |
| } |
| |
| private: |
| void store8(RegisterID src, ArmAddress address) |
| { |
| if (address.type == ArmAddress::HasIndex) |
| m_assembler.strb(src, address.base, address.u.index, address.u.scale); |
| else if (address.u.offset >= 0) { |
| ARMThumbImmediate armImm = ARMThumbImmediate::makeUInt12(address.u.offset); |
| ASSERT(armImm.isValid()); |
| m_assembler.strb(src, address.base, armImm); |
| } else { |
| ASSERT(address.u.offset >= -255); |
| m_assembler.strb(src, address.base, address.u.offset, true, false); |
| } |
| } |
| |
| void store16(RegisterID src, ArmAddress address) |
| { |
| if (address.type == ArmAddress::HasIndex) |
| m_assembler.strh(src, address.base, address.u.index, address.u.scale); |
| else if (address.u.offset >= 0) { |
| ARMThumbImmediate armImm = ARMThumbImmediate::makeUInt12(address.u.offset); |
| ASSERT(armImm.isValid()); |
| m_assembler.strh(src, address.base, armImm); |
| } else { |
| ASSERT(address.u.offset >= -255); |
| m_assembler.strh(src, address.base, address.u.offset, true, false); |
| } |
| } |
| |
| public: |
| void load32(ImplicitAddress address, RegisterID dest) |
| { |
| load32(setupArmAddress(address), dest); |
| } |
| |
| void load32(BaseIndex address, RegisterID dest) |
| { |
| load32(setupArmAddress(address), dest); |
| } |
| |
| void load32WithUnalignedHalfWords(BaseIndex address, RegisterID dest) |
| { |
| load32(setupArmAddress(address), dest); |
| } |
| |
| void load16Unaligned(BaseIndex address, RegisterID dest) |
| { |
| load16(setupArmAddress(address), dest); |
| } |
| |
| void load32(const void* address, RegisterID dest) |
| { |
| move(TrustedImmPtr(address), addressTempRegister); |
| m_assembler.ldr(dest, addressTempRegister, ARMThumbImmediate::makeUInt16(0)); |
| } |
| |
| void abortWithReason(AbortReason reason) |
| { |
| move(TrustedImm32(reason), dataTempRegister); |
| breakpoint(); |
| } |
| |
| void abortWithReason(AbortReason reason, intptr_t misc) |
| { |
| move(TrustedImm32(misc), addressTempRegister); |
| abortWithReason(reason); |
| } |
| |
| ConvertibleLoadLabel convertibleLoadPtr(Address address, RegisterID dest) |
| { |
| ConvertibleLoadLabel result(this); |
| ASSERT(address.offset >= 0 && address.offset <= 255); |
| m_assembler.ldrWide8BitImmediate(dest, address.base, address.offset); |
| return result; |
| } |
| |
| void load8(ImplicitAddress address, RegisterID dest) |
| { |
| load8(setupArmAddress(address), dest); |
| } |
| |
| void load8SignedExtendTo32(ImplicitAddress, RegisterID) |
| { |
| UNREACHABLE_FOR_PLATFORM(); |
| } |
| |
| void load8(BaseIndex address, RegisterID dest) |
| { |
| load8(setupArmAddress(address), dest); |
| } |
| |
| void load8SignedExtendTo32(BaseIndex address, RegisterID dest) |
| { |
| load8SignedExtendTo32(setupArmAddress(address), dest); |
| } |
| |
| void load8(const void* address, RegisterID dest) |
| { |
| move(TrustedImmPtr(address), dest); |
| load8(dest, dest); |
| } |
| |
| DataLabel32 load32WithAddressOffsetPatch(Address address, RegisterID dest) |
| { |
| DataLabel32 label = moveWithPatch(TrustedImm32(address.offset), dataTempRegister); |
| load32(ArmAddress(address.base, dataTempRegister), dest); |
| return label; |
| } |
| |
| DataLabelCompact load32WithCompactAddressOffsetPatch(Address address, RegisterID dest) |
| { |
| padBeforePatch(); |
| |
| RegisterID base = address.base; |
| |
| DataLabelCompact label(this); |
| ASSERT(isCompactPtrAlignedAddressOffset(address.offset)); |
| |
| m_assembler.ldr(dest, base, address.offset, true, false); |
| return label; |
| } |
| |
| void load16(BaseIndex address, RegisterID dest) |
| { |
| m_assembler.ldrh(dest, makeBaseIndexBase(address), address.index, address.scale); |
| } |
| |
| void load16SignedExtendTo32(BaseIndex address, RegisterID dest) |
| { |
| load16SignedExtendTo32(setupArmAddress(address), dest); |
| } |
| |
| void load16(ImplicitAddress address, RegisterID dest) |
| { |
| ARMThumbImmediate armImm = ARMThumbImmediate::makeUInt12(address.offset); |
| if (armImm.isValid()) |
| m_assembler.ldrh(dest, address.base, armImm); |
| else { |
| move(TrustedImm32(address.offset), dataTempRegister); |
| m_assembler.ldrh(dest, address.base, dataTempRegister); |
| } |
| } |
| |
| void load16SignedExtendTo32(ImplicitAddress, RegisterID) |
| { |
| UNREACHABLE_FOR_PLATFORM(); |
| } |
| |
| void store64Exclusive(RegisterID s0, RegisterID s1, TrustedImmPtr address); |
| |
| DataLabel32 store32WithAddressOffsetPatch(RegisterID src, Address address) |
| { |
| DataLabel32 label = moveWithPatch(TrustedImm32(address.offset), dataTempRegister); |
| store32(src, ArmAddress(address.base, dataTempRegister)); |
| return label; |
| } |
| |
| void store32(RegisterID src, ImplicitAddress address) |
| { |
| store32(src, setupArmAddress(address)); |
| } |
| |
| void store32(RegisterID src, BaseIndex address) |
| { |
| store32(src, setupArmAddress(address)); |
| } |
| |
| void store32(TrustedImm32 imm, ImplicitAddress address) |
| { |
| move(imm, dataTempRegister); |
| store32(dataTempRegister, setupArmAddress(address)); |
| } |
| |
| void store32(TrustedImm32 imm, BaseIndex address) |
| { |
| move(imm, dataTempRegister); |
| store32(dataTempRegister, setupArmAddress(address)); |
| } |
| |
| void store32(RegisterID src, const void* address) |
| { |
| move(TrustedImmPtr(address), addressTempRegister); |
| m_assembler.str(src, addressTempRegister, ARMThumbImmediate::makeUInt16(0)); |
| } |
| |
| void store32(TrustedImm32 imm, const void* address) |
| { |
| move(imm, dataTempRegister); |
| store32(dataTempRegister, address); |
| } |
| |
| void store8(RegisterID src, Address address) |
| { |
| store8(src, setupArmAddress(address)); |
| } |
| |
| void store8(RegisterID src, BaseIndex address) |
| { |
| store8(src, setupArmAddress(address)); |
| } |
| |
| void store8(RegisterID src, void* address) |
| { |
| move(TrustedImmPtr(address), addressTempRegister); |
| store8(src, ArmAddress(addressTempRegister, 0)); |
| } |
| |
| void store8(TrustedImm32 imm, void* address) |
| { |
| TrustedImm32 imm8(static_cast<int8_t>(imm.m_value)); |
| move(imm8, dataTempRegister); |
| store8(dataTempRegister, address); |
| } |
| |
| void store8(TrustedImm32 imm, Address address) |
| { |
| TrustedImm32 imm8(static_cast<int8_t>(imm.m_value)); |
| move(imm8, dataTempRegister); |
| store8(dataTempRegister, address); |
| } |
| |
| void store16(RegisterID src, BaseIndex address) |
| { |
| store16(src, setupArmAddress(address)); |
| } |
| |
| // Possibly clobbers src, but not on this architecture. |
| void moveDoubleToInts(FPRegisterID src, RegisterID dest1, RegisterID dest2) |
| { |
| m_assembler.vmov(dest1, dest2, src); |
| } |
| |
| void moveIntsToDouble(RegisterID src1, RegisterID src2, FPRegisterID dest, FPRegisterID scratch) |
| { |
| UNUSED_PARAM(scratch); |
| m_assembler.vmov(dest, src1, src2); |
| } |
| |
| static bool shouldBlindForSpecificArch(uint32_t value) |
| { |
| ARMThumbImmediate immediate = ARMThumbImmediate::makeEncodedImm(value); |
| |
| // Couldn't be encoded as an immediate, so assume it's untrusted. |
| if (!immediate.isValid()) |
| return true; |
| |
| // If we can encode the immediate, we have less than 16 attacker |
| // controlled bits. |
| if (immediate.isEncodedImm()) |
| return false; |
| |
| // Don't let any more than 12 bits of an instruction word |
| // be controlled by an attacker. |
| return !immediate.isUInt12(); |
| } |
| |
| // Floating-point operations: |
| |
| static bool supportsFloatingPoint() { return true; } |
| static bool supportsFloatingPointTruncate() { return true; } |
| static bool supportsFloatingPointSqrt() { return true; } |
| static bool supportsFloatingPointAbs() { return true; } |
| static bool supportsFloatingPointRounding() { return false; } |
| |
| void loadDouble(ImplicitAddress address, FPRegisterID dest) |
| { |
| RegisterID base = address.base; |
| int32_t offset = address.offset; |
| |
| // Arm vfp addresses can be offset by a 9-bit ones-comp immediate, left shifted by 2. |
| if ((offset & 3) || (offset > (255 * 4)) || (offset < -(255 * 4))) { |
| add32(TrustedImm32(offset), base, addressTempRegister); |
| base = addressTempRegister; |
| offset = 0; |
| } |
| |
| m_assembler.vldr(dest, base, offset); |
| } |
| |
| void loadFloat(ImplicitAddress address, FPRegisterID dest) |
| { |
| RegisterID base = address.base; |
| int32_t offset = address.offset; |
| |
| // Arm vfp addresses can be offset by a 9-bit ones-comp immediate, left shifted by 2. |
| if ((offset & 3) || (offset > (255 * 4)) || (offset < -(255 * 4))) { |
| add32(TrustedImm32(offset), base, addressTempRegister); |
| base = addressTempRegister; |
| offset = 0; |
| } |
| |
| m_assembler.flds(ARMRegisters::asSingle(dest), base, offset); |
| } |
| |
| void loadDouble(BaseIndex address, FPRegisterID dest) |
| { |
| move(address.index, addressTempRegister); |
| lshift32(TrustedImm32(address.scale), addressTempRegister); |
| add32(address.base, addressTempRegister); |
| loadDouble(Address(addressTempRegister, address.offset), dest); |
| } |
| |
| void loadFloat(BaseIndex address, FPRegisterID dest) |
| { |
| move(address.index, addressTempRegister); |
| lshift32(TrustedImm32(address.scale), addressTempRegister); |
| add32(address.base, addressTempRegister); |
| loadFloat(Address(addressTempRegister, address.offset), dest); |
| } |
| |
| void moveDouble(FPRegisterID src, FPRegisterID dest) |
| { |
| if (src != dest) |
| m_assembler.vmov(dest, src); |
| } |
| |
| void moveZeroToDouble(FPRegisterID reg) |
| { |
| static double zeroConstant = 0.; |
| loadDouble(TrustedImmPtr(&zeroConstant), reg); |
| } |
| |
| void loadDouble(TrustedImmPtr address, FPRegisterID dest) |
| { |
| move(address, addressTempRegister); |
| m_assembler.vldr(dest, addressTempRegister, 0); |
| } |
| |
| void storeDouble(FPRegisterID src, ImplicitAddress address) |
| { |
| RegisterID base = address.base; |
| int32_t offset = address.offset; |
| |
| // Arm vfp addresses can be offset by a 9-bit ones-comp immediate, left shifted by 2. |
| if ((offset & 3) || (offset > (255 * 4)) || (offset < -(255 * 4))) { |
| add32(TrustedImm32(offset), base, addressTempRegister); |
| base = addressTempRegister; |
| offset = 0; |
| } |
| |
| m_assembler.vstr(src, base, offset); |
| } |
| |
| void storeFloat(FPRegisterID src, ImplicitAddress address) |
| { |
| RegisterID base = address.base; |
| int32_t offset = address.offset; |
| |
| // Arm vfp addresses can be offset by a 9-bit ones-comp immediate, left shifted by 2. |
| if ((offset & 3) || (offset > (255 * 4)) || (offset < -(255 * 4))) { |
| add32(TrustedImm32(offset), base, addressTempRegister); |
| base = addressTempRegister; |
| offset = 0; |
| } |
| |
| m_assembler.fsts(ARMRegisters::asSingle(src), base, offset); |
| } |
| |
| void storeDouble(FPRegisterID src, TrustedImmPtr address) |
| { |
| move(address, addressTempRegister); |
| storeDouble(src, addressTempRegister); |
| } |
| |
| void storeDouble(FPRegisterID src, BaseIndex address) |
| { |
| move(address.index, addressTempRegister); |
| lshift32(TrustedImm32(address.scale), addressTempRegister); |
| add32(address.base, addressTempRegister); |
| storeDouble(src, Address(addressTempRegister, address.offset)); |
| } |
| |
| void storeFloat(FPRegisterID src, BaseIndex address) |
| { |
| move(address.index, addressTempRegister); |
| lshift32(TrustedImm32(address.scale), addressTempRegister); |
| add32(address.base, addressTempRegister); |
| storeFloat(src, Address(addressTempRegister, address.offset)); |
| } |
| |
| void addDouble(FPRegisterID src, FPRegisterID dest) |
| { |
| m_assembler.vadd(dest, dest, src); |
| } |
| |
| void addDouble(Address src, FPRegisterID dest) |
| { |
| loadDouble(src, fpTempRegister); |
| addDouble(fpTempRegister, dest); |
| } |
| |
| void addDouble(FPRegisterID op1, FPRegisterID op2, FPRegisterID dest) |
| { |
| m_assembler.vadd(dest, op1, op2); |
| } |
| |
| void addDouble(AbsoluteAddress address, FPRegisterID dest) |
| { |
| loadDouble(TrustedImmPtr(address.m_ptr), fpTempRegister); |
| m_assembler.vadd(dest, dest, fpTempRegister); |
| } |
| |
| void divDouble(FPRegisterID src, FPRegisterID dest) |
| { |
| m_assembler.vdiv(dest, dest, src); |
| } |
| |
| void divDouble(FPRegisterID op1, FPRegisterID op2, FPRegisterID dest) |
| { |
| m_assembler.vdiv(dest, op1, op2); |
| } |
| |
| void subDouble(FPRegisterID src, FPRegisterID dest) |
| { |
| m_assembler.vsub(dest, dest, src); |
| } |
| |
| void subDouble(Address src, FPRegisterID dest) |
| { |
| loadDouble(src, fpTempRegister); |
| subDouble(fpTempRegister, dest); |
| } |
| |
| void subDouble(FPRegisterID op1, FPRegisterID op2, FPRegisterID dest) |
| { |
| m_assembler.vsub(dest, op1, op2); |
| } |
| |
| void mulDouble(FPRegisterID src, FPRegisterID dest) |
| { |
| m_assembler.vmul(dest, dest, src); |
| } |
| |
| void mulDouble(Address src, FPRegisterID dest) |
| { |
| loadDouble(src, fpTempRegister); |
| mulDouble(fpTempRegister, dest); |
| } |
| |
| void mulDouble(FPRegisterID op1, FPRegisterID op2, FPRegisterID dest) |
| { |
| m_assembler.vmul(dest, op1, op2); |
| } |
| |
| void sqrtDouble(FPRegisterID src, FPRegisterID dest) |
| { |
| m_assembler.vsqrt(dest, src); |
| } |
| |
| void absDouble(FPRegisterID src, FPRegisterID dest) |
| { |
| m_assembler.vabs(dest, src); |
| } |
| |
| void negateDouble(FPRegisterID src, FPRegisterID dest) |
| { |
| m_assembler.vneg(dest, src); |
| } |
| |
| NO_RETURN_DUE_TO_CRASH void ceilDouble(FPRegisterID, FPRegisterID) |
| { |
| ASSERT(!supportsFloatingPointRounding()); |
| CRASH(); |
| } |
| |
| NO_RETURN_DUE_TO_CRASH void floorDouble(FPRegisterID, FPRegisterID) |
| { |
| ASSERT(!supportsFloatingPointRounding()); |
| CRASH(); |
| } |
| |
| NO_RETURN_DUE_TO_CRASH void roundTowardZeroDouble(FPRegisterID, FPRegisterID) |
| { |
| ASSERT(!supportsFloatingPointRounding()); |
| CRASH(); |
| } |
| |
| void convertInt32ToDouble(RegisterID src, FPRegisterID dest) |
| { |
| m_assembler.vmov(fpTempRegister, src, src); |
| m_assembler.vcvt_signedToFloatingPoint(dest, fpTempRegisterAsSingle()); |
| } |
| |
| void convertInt32ToDouble(Address address, FPRegisterID dest) |
| { |
| // Fixme: load directly into the fpr! |
| load32(address, dataTempRegister); |
| m_assembler.vmov(fpTempRegister, dataTempRegister, dataTempRegister); |
| m_assembler.vcvt_signedToFloatingPoint(dest, fpTempRegisterAsSingle()); |
| } |
| |
| void convertInt32ToDouble(AbsoluteAddress address, FPRegisterID dest) |
| { |
| // Fixme: load directly into the fpr! |
| load32(address.m_ptr, dataTempRegister); |
| m_assembler.vmov(fpTempRegister, dataTempRegister, dataTempRegister); |
| m_assembler.vcvt_signedToFloatingPoint(dest, fpTempRegisterAsSingle()); |
| } |
| |
| void convertFloatToDouble(FPRegisterID src, FPRegisterID dst) |
| { |
| m_assembler.vcvtds(dst, ARMRegisters::asSingle(src)); |
| } |
| |
| void convertDoubleToFloat(FPRegisterID src, FPRegisterID dst) |
| { |
| m_assembler.vcvtsd(ARMRegisters::asSingle(dst), src); |
| } |
| |
| Jump branchDouble(DoubleCondition cond, FPRegisterID left, FPRegisterID right) |
| { |
| m_assembler.vcmp(left, right); |
| m_assembler.vmrs(); |
| |
| if (cond == DoubleNotEqual) { |
| // ConditionNE jumps if NotEqual *or* unordered - force the unordered cases not to jump. |
| Jump unordered = makeBranch(ARMv7Assembler::ConditionVS); |
| Jump result = makeBranch(ARMv7Assembler::ConditionNE); |
| unordered.link(this); |
| return result; |
| } |
| if (cond == DoubleEqualOrUnordered) { |
| Jump unordered = makeBranch(ARMv7Assembler::ConditionVS); |
| Jump notEqual = makeBranch(ARMv7Assembler::ConditionNE); |
| unordered.link(this); |
| // We get here if either unordered or equal. |
| Jump result = jump(); |
| notEqual.link(this); |
| return result; |
| } |
| return makeBranch(cond); |
| } |
| |
| enum BranchTruncateType { BranchIfTruncateFailed, BranchIfTruncateSuccessful }; |
| Jump branchTruncateDoubleToInt32(FPRegisterID src, RegisterID dest, BranchTruncateType branchType = BranchIfTruncateFailed) |
| { |
| // Convert into dest. |
| m_assembler.vcvt_floatingPointToSigned(fpTempRegisterAsSingle(), src); |
| m_assembler.vmov(dest, fpTempRegisterAsSingle()); |
| |
| // Calculate 2x dest. If the value potentially underflowed, it will have |
| // clamped to 0x80000000, so 2x dest is zero in this case. In the case of |
| // overflow the result will be equal to -2. |
| Jump underflow = branchAdd32(Zero, dest, dest, dataTempRegister); |
| Jump noOverflow = branch32(NotEqual, dataTempRegister, TrustedImm32(-2)); |
| |
| // For BranchIfTruncateSuccessful, we branch if 'noOverflow' jumps. |
| underflow.link(this); |
| if (branchType == BranchIfTruncateSuccessful) |
| return noOverflow; |
| |
| // We'll reach the current point in the code on failure, so plant a |
| // jump here & link the success case. |
| Jump failure = jump(); |
| noOverflow.link(this); |
| return failure; |
| } |
| |
| // Result is undefined if the value is outside of the integer range. |
| void truncateDoubleToInt32(FPRegisterID src, RegisterID dest) |
| { |
| m_assembler.vcvt_floatingPointToSigned(fpTempRegisterAsSingle(), src); |
| m_assembler.vmov(dest, fpTempRegisterAsSingle()); |
| } |
| |
| void truncateDoubleToUint32(FPRegisterID src, RegisterID dest) |
| { |
| m_assembler.vcvt_floatingPointToUnsigned(fpTempRegisterAsSingle(), src); |
| m_assembler.vmov(dest, fpTempRegisterAsSingle()); |
| } |
| |
| // Convert 'src' to an integer, and places the resulting 'dest'. |
| // If the result is not representable as a 32 bit value, branch. |
| // May also branch for some values that are representable in 32 bits |
| // (specifically, in this case, 0). |
| void branchConvertDoubleToInt32(FPRegisterID src, RegisterID dest, JumpList& failureCases, FPRegisterID, bool negZeroCheck = true) |
| { |
| m_assembler.vcvt_floatingPointToSigned(fpTempRegisterAsSingle(), src); |
| m_assembler.vmov(dest, fpTempRegisterAsSingle()); |
| |
| // Convert the integer result back to float & compare to the original value - if not equal or unordered (NaN) then jump. |
| m_assembler.vcvt_signedToFloatingPoint(fpTempRegister, fpTempRegisterAsSingle()); |
| failureCases.append(branchDouble(DoubleNotEqualOrUnordered, src, fpTempRegister)); |
| |
| // If the result is zero, it might have been -0.0, and the double comparison won't catch this! |
| if (negZeroCheck) |
| failureCases.append(branchTest32(Zero, dest)); |
| } |
| |
| Jump branchDoubleNonZero(FPRegisterID reg, FPRegisterID) |
| { |
| m_assembler.vcmpz(reg); |
| m_assembler.vmrs(); |
| Jump unordered = makeBranch(ARMv7Assembler::ConditionVS); |
| Jump result = makeBranch(ARMv7Assembler::ConditionNE); |
| unordered.link(this); |
| return result; |
| } |
| |
| Jump branchDoubleZeroOrNaN(FPRegisterID reg, FPRegisterID) |
| { |
| m_assembler.vcmpz(reg); |
| m_assembler.vmrs(); |
| Jump unordered = makeBranch(ARMv7Assembler::ConditionVS); |
| Jump notEqual = makeBranch(ARMv7Assembler::ConditionNE); |
| unordered.link(this); |
| // We get here if either unordered or equal. |
| Jump result = jump(); |
| notEqual.link(this); |
| return result; |
| } |
| |
| // Stack manipulation operations: |
| // |
| // The ABI is assumed to provide a stack abstraction to memory, |
| // containing machine word sized units of data. Push and pop |
| // operations add and remove a single register sized unit of data |
| // to or from the stack. Peek and poke operations read or write |
| // values on the stack, without moving the current stack position. |
| |
| void pop(RegisterID dest) |
| { |
| m_assembler.pop(dest); |
| } |
| |
| void push(RegisterID src) |
| { |
| m_assembler.push(src); |
| } |
| |
| void push(Address address) |
| { |
| load32(address, dataTempRegister); |
| push(dataTempRegister); |
| } |
| |
| void push(TrustedImm32 imm) |
| { |
| move(imm, dataTempRegister); |
| push(dataTempRegister); |
| } |
| |
| void popPair(RegisterID dest1, RegisterID dest2) |
| { |
| m_assembler.pop(1 << dest1 | 1 << dest2); |
| } |
| |
| void popThree(RegisterID src1, RegisterID src2, RegisterID src3) |
| { |
| m_assembler.pop(1 << src1 | 1 << src2 | 1 << src3); |
| } |
| |
| void pushPair(RegisterID src1, RegisterID src2) |
| { |
| m_assembler.push(1 << src1 | 1 << src2); |
| } |
| |
| void pushThree(RegisterID src1, RegisterID src2, RegisterID src3) |
| { |
| m_assembler.push(1 << src1 | 1 << src2 | 1 << src3); |
| } |
| |
| // Register move operations: |
| // |
| // Move values in registers. |
| |
| void move(TrustedImm32 imm, RegisterID dest) |
| { |
| uint32_t value = imm.m_value; |
| |
| ARMThumbImmediate armImm = ARMThumbImmediate::makeEncodedImm(value); |
| |
| if (armImm.isValid()) |
| m_assembler.mov(dest, armImm); |
| else if ((armImm = ARMThumbImmediate::makeEncodedImm(~value)).isValid()) |
| m_assembler.mvn(dest, armImm); |
| else { |
| m_assembler.mov(dest, ARMThumbImmediate::makeUInt16(value)); |
| if (value & 0xffff0000) |
| m_assembler.movt(dest, ARMThumbImmediate::makeUInt16(value >> 16)); |
| } |
| } |
| |
| void move(RegisterID src, RegisterID dest) |
| { |
| if (src != dest) |
| m_assembler.mov(dest, src); |
| } |
| |
| void move(TrustedImmPtr imm, RegisterID dest) |
| { |
| move(TrustedImm32(imm), dest); |
| } |
| |
| void swap(RegisterID reg1, RegisterID reg2) |
| { |
| move(reg1, dataTempRegister); |
| move(reg2, reg1); |
| move(dataTempRegister, reg2); |
| } |
| |
| void signExtend32ToPtr(RegisterID src, RegisterID dest) |
| { |
| move(src, dest); |
| } |
| |
| void zeroExtend32ToPtr(RegisterID src, RegisterID dest) |
| { |
| move(src, dest); |
| } |
| |
| // Invert a relational condition, e.g. == becomes !=, < becomes >=, etc. |
| static RelationalCondition invert(RelationalCondition cond) |
| { |
| return static_cast<RelationalCondition>(cond ^ 1); |
| } |
| |
| void nop() |
| { |
| m_assembler.nop(); |
| } |
| |
| void memoryFence() |
| { |
| m_assembler.dmbSY(); |
| } |
| |
| void storeFence() |
| { |
| m_assembler.dmbISHST(); |
| } |
| |
| static void replaceWithBreakpoint(CodeLocationLabel instructionStart) |
| { |
| ARMv7Assembler::replaceWithBkpt(instructionStart.dataLocation()); |
| } |
| |
| static void replaceWithJump(CodeLocationLabel instructionStart, CodeLocationLabel destination) |
| { |
| ARMv7Assembler::replaceWithJump(instructionStart.dataLocation(), destination.dataLocation()); |
| } |
| |
| static ptrdiff_t maxJumpReplacementSize() |
| { |
| return ARMv7Assembler::maxJumpReplacementSize(); |
| } |
| |
| static ptrdiff_t patchableJumpSize() |
| { |
| return ARMv7Assembler::patchableJumpSize(); |
| } |
| |
| // Forwards / external control flow operations: |
| // |
| // This set of jump and conditional branch operations return a Jump |
| // object which may linked at a later point, allow forwards jump, |
| // or jumps that will require external linkage (after the code has been |
| // relocated). |
| // |
| // For branches, signed <, >, <= and >= are denoted as l, g, le, and ge |
| // respecitvely, for unsigned comparisons the names b, a, be, and ae are |
| // used (representing the names 'below' and 'above'). |
| // |
| // Operands to the comparision are provided in the expected order, e.g. |
| // jle32(reg1, TrustedImm32(5)) will branch if the value held in reg1, when |
| // treated as a signed 32bit value, is less than or equal to 5. |
| // |
| // jz and jnz test whether the first operand is equal to zero, and take |
| // an optional second operand of a mask under which to perform the test. |
| private: |
| |
| // Should we be using TEQ for equal/not-equal? |
| void compare32AndSetFlags(RegisterID left, TrustedImm32 right) |
| { |
| int32_t imm = right.m_value; |
| ARMThumbImmediate armImm = ARMThumbImmediate::makeEncodedImm(imm); |
| if (armImm.isValid()) |
| m_assembler.cmp(left, armImm); |
| else if ((armImm = ARMThumbImmediate::makeEncodedImm(-imm)).isValid()) |
| m_assembler.cmn(left, armImm); |
| else { |
| move(TrustedImm32(imm), dataTempRegister); |
| m_assembler.cmp(left, dataTempRegister); |
| } |
| } |
| |
| public: |
| void test32(RegisterID reg, TrustedImm32 mask = TrustedImm32(-1)) |
| { |
| int32_t imm = mask.m_value; |
| |
| if (imm == -1) |
| m_assembler.tst(reg, reg); |
| else { |
| ARMThumbImmediate armImm = ARMThumbImmediate::makeEncodedImm(imm); |
| if (armImm.isValid()) { |
| if (reg == ARMRegisters::sp) { |
| move(reg, addressTempRegister); |
| m_assembler.tst(addressTempRegister, armImm); |
| } else |
| m_assembler.tst(reg, armImm); |
| } else { |
| move(mask, dataTempRegister); |
| if (reg == ARMRegisters::sp) { |
| move(reg, addressTempRegister); |
| m_assembler.tst(addressTempRegister, dataTempRegister); |
| } else |
| m_assembler.tst(reg, dataTempRegister); |
| } |
| } |
| } |
| |
| Jump branch(ResultCondition cond) |
| { |
| return Jump(makeBranch(cond)); |
| } |
| |
| Jump branch32(RelationalCondition cond, RegisterID left, RegisterID right) |
| { |
| m_assembler.cmp(left, right); |
| return Jump(makeBranch(cond)); |
| } |
| |
| Jump branch32(RelationalCondition cond, RegisterID left, TrustedImm32 right) |
| { |
| compare32AndSetFlags(left, right); |
| return Jump(makeBranch(cond)); |
| } |
| |
| Jump branch32(RelationalCondition cond, RegisterID left, Address right) |
| { |
| load32(right, dataTempRegister); |
| return branch32(cond, left, dataTempRegister); |
| } |
| |
| Jump branch32(RelationalCondition cond, Address left, RegisterID right) |
| { |
| load32(left, dataTempRegister); |
| return branch32(cond, dataTempRegister, right); |
| } |
| |
| Jump branch32(RelationalCondition cond, Address left, TrustedImm32 right) |
| { |
| // use addressTempRegister incase the branch32 we call uses dataTempRegister. :-/ |
| load32(left, addressTempRegister); |
| return branch32(cond, addressTempRegister, right); |
| } |
| |
| Jump branch32(RelationalCondition cond, BaseIndex left, TrustedImm32 right) |
| { |
| // use addressTempRegister incase the branch32 we call uses dataTempRegister. :-/ |
| load32(left, addressTempRegister); |
| return branch32(cond, addressTempRegister, right); |
| } |
| |
| Jump branch32WithUnalignedHalfWords(RelationalCondition cond, BaseIndex left, TrustedImm32 right) |
| { |
| // use addressTempRegister incase the branch32 we call uses dataTempRegister. :-/ |
| load32WithUnalignedHalfWords(left, addressTempRegister); |
| return branch32(cond, addressTempRegister, right); |
| } |
| |
| Jump branch32(RelationalCondition cond, AbsoluteAddress left, RegisterID right) |
| { |
| load32(left.m_ptr, dataTempRegister); |
| return branch32(cond, dataTempRegister, right); |
| } |
| |
| Jump branch32(RelationalCondition cond, AbsoluteAddress left, TrustedImm32 right) |
| { |
| // use addressTempRegister incase the branch32 we call uses dataTempRegister. :-/ |
| load32(left.m_ptr, addressTempRegister); |
| return branch32(cond, addressTempRegister, right); |
| } |
| |
| Jump branchPtr(RelationalCondition cond, BaseIndex left, RegisterID right) |
| { |
| load32(left, dataTempRegister); |
| return branch32(cond, dataTempRegister, right); |
| } |
| |
| Jump branch8(RelationalCondition cond, RegisterID left, TrustedImm32 right) |
| { |
| TrustedImm32 right8 = MacroAssemblerHelpers::mask8OnCondition(*this, cond, right); |
| compare32AndSetFlags(left, right8); |
| return Jump(makeBranch(cond)); |
| } |
| |
| Jump branch8(RelationalCondition cond, Address left, TrustedImm32 right) |
| { |
| // use addressTempRegister incase the branch8 we call uses dataTempRegister. :-/ |
| TrustedImm32 right8 = MacroAssemblerHelpers::mask8OnCondition(*this, cond, right); |
| MacroAssemblerHelpers::load8OnCondition(*this, cond, left, addressTempRegister); |
| return branch8(cond, addressTempRegister, right8); |
| } |
| |
| Jump branch8(RelationalCondition cond, BaseIndex left, TrustedImm32 right) |
| { |
| // use addressTempRegister incase the branch32 we call uses dataTempRegister. :-/ |
| TrustedImm32 right8 = MacroAssemblerHelpers::mask8OnCondition(*this, cond, right); |
| MacroAssemblerHelpers::load8OnCondition(*this, cond, left, addressTempRegister); |
| return branch32(cond, addressTempRegister, right8); |
| } |
| |
| Jump branch8(RelationalCondition cond, AbsoluteAddress address, TrustedImm32 right) |
| { |
| // Use addressTempRegister instead of dataTempRegister, since branch32 uses dataTempRegister. |
| TrustedImm32 right8 = MacroAssemblerHelpers::mask8OnCondition(*this, cond, right); |
| move(TrustedImmPtr(address.m_ptr), addressTempRegister); |
| MacroAssemblerHelpers::load8OnCondition(*this, cond, Address(addressTempRegister), addressTempRegister); |
| return branch32(cond, addressTempRegister, right8); |
| } |
| |
| Jump branchTest32(ResultCondition cond, RegisterID reg, RegisterID mask) |
| { |
| ASSERT(cond == Zero || cond == NonZero || cond == Signed || cond == PositiveOrZero); |
| m_assembler.tst(reg, mask); |
| return Jump(makeBranch(cond)); |
| } |
| |
| Jump branchTest32(ResultCondition cond, RegisterID reg, TrustedImm32 mask = TrustedImm32(-1)) |
| { |
| ASSERT(cond == Zero || cond == NonZero || cond == Signed || cond == PositiveOrZero); |
| test32(reg, mask); |
| return Jump(makeBranch(cond)); |
| } |
| |
| Jump branchTest32(ResultCondition cond, Address address, TrustedImm32 mask = TrustedImm32(-1)) |
| { |
| // use addressTempRegister incase the branchTest32 we call uses dataTempRegister. :-/ |
| load32(address, addressTempRegister); |
| return branchTest32(cond, addressTempRegister, mask); |
| } |
| |
| Jump branchTest32(ResultCondition cond, BaseIndex address, TrustedImm32 mask = TrustedImm32(-1)) |
| { |
| // use addressTempRegister incase the branchTest32 we call uses dataTempRegister. :-/ |
| load32(address, addressTempRegister); |
| return branchTest32(cond, addressTempRegister, mask); |
| } |
| |
| Jump branchTest8(ResultCondition cond, BaseIndex address, TrustedImm32 mask = TrustedImm32(-1)) |
| { |
| // use addressTempRegister incase the branchTest8 we call uses dataTempRegister. :-/ |
| TrustedImm32 mask8 = MacroAssemblerHelpers::mask8OnCondition(*this, cond, mask); |
| MacroAssemblerHelpers::load8OnCondition(*this, cond, address, addressTempRegister); |
| return branchTest32(cond, addressTempRegister, mask8); |
| } |
| |
| Jump branchTest8(ResultCondition cond, Address address, TrustedImm32 mask = TrustedImm32(-1)) |
| { |
| // use addressTempRegister incase the branchTest8 we call uses dataTempRegister. :-/ |
| TrustedImm32 mask8 = MacroAssemblerHelpers::mask8OnCondition(*this, cond, mask); |
| MacroAssemblerHelpers::load8OnCondition(*this, cond, address, addressTempRegister); |
| return branchTest32(cond, addressTempRegister, mask8); |
| } |
| |
| Jump branchTest8(ResultCondition cond, AbsoluteAddress address, TrustedImm32 mask = TrustedImm32(-1)) |
| { |
| // use addressTempRegister incase the branchTest8 we call uses dataTempRegister. :-/ |
| TrustedImm32 mask8 = MacroAssemblerHelpers::mask8OnCondition(*this, cond, mask); |
| move(TrustedImmPtr(address.m_ptr), addressTempRegister); |
| MacroAssemblerHelpers::load8OnCondition(*this, cond, Address(addressTempRegister), addressTempRegister); |
| return branchTest32(cond, addressTempRegister, mask8); |
| } |
| |
| void jump(RegisterID target) |
| { |
| m_assembler.bx(target); |
| } |
| |
| // Address is a memory location containing the address to jump to |
| void jump(Address address) |
| { |
| load32(address, dataTempRegister); |
| m_assembler.bx(dataTempRegister); |
| } |
| |
| void jump(AbsoluteAddress address) |
| { |
| move(TrustedImmPtr(address.m_ptr), dataTempRegister); |
| load32(Address(dataTempRegister), dataTempRegister); |
| m_assembler.bx(dataTempRegister); |
| } |
| |
| |
| // Arithmetic control flow operations: |
| // |
| // This set of conditional branch operations branch based |
| // on the result of an arithmetic operation. The operation |
| // is performed as normal, storing the result. |
| // |
| // * jz operations branch if the result is zero. |
| // * jo operations branch if the (signed) arithmetic |
| // operation caused an overflow to occur. |
| |
| Jump branchAdd32(ResultCondition cond, RegisterID op1, RegisterID op2, RegisterID dest) |
| { |
| m_assembler.add_S(dest, op1, op2); |
| return Jump(makeBranch(cond)); |
| } |
| |
| Jump branchAdd32(ResultCondition cond, RegisterID op1, TrustedImm32 imm, RegisterID dest) |
| { |
| ARMThumbImmediate armImm = ARMThumbImmediate::makeEncodedImm(imm.m_value); |
| if (armImm.isValid()) |
| m_assembler.add_S(dest, op1, armImm); |
| else { |
| move(imm, dataTempRegister); |
| m_assembler.add_S(dest, op1, dataTempRegister); |
| } |
| return Jump(makeBranch(cond)); |
| } |
| |
| Jump branchAdd32(ResultCondition cond, RegisterID src, RegisterID dest) |
| { |
| return branchAdd32(cond, dest, src, dest); |
| } |
| |
| Jump branchAdd32(ResultCondition cond, Address src, RegisterID dest) |
| { |
| load32(src, dataTempRegister); |
| return branchAdd32(cond, dest, dataTempRegister, dest); |
| } |
| |
| Jump branchAdd32(ResultCondition cond, TrustedImm32 imm, RegisterID dest) |
| { |
| return branchAdd32(cond, dest, imm, dest); |
| } |
| |
| Jump branchAdd32(ResultCondition cond, TrustedImm32 imm, AbsoluteAddress dest) |
| { |
| // Move the high bits of the address into addressTempRegister, |
| // and load the value into dataTempRegister. |
| move(TrustedImmPtr(dest.m_ptr), addressTempRegister); |
| m_assembler.ldr(dataTempRegister, addressTempRegister, ARMThumbImmediate::makeUInt16(0)); |
| |
| // Do the add. |
| ARMThumbImmediate armImm = ARMThumbImmediate::makeEncodedImm(imm.m_value); |
| if (armImm.isValid()) |
| m_assembler.add_S(dataTempRegister, dataTempRegister, armImm); |
| else { |
| // If the operand does not fit into an immediate then load it temporarily |
| // into addressTempRegister; since we're overwriting addressTempRegister |
| // we'll need to reload it with the high bits of the address afterwards. |
| move(imm, addressTempRegister); |
| m_assembler.add_S(dataTempRegister, dataTempRegister, addressTempRegister); |
| move(TrustedImmPtr(dest.m_ptr), addressTempRegister); |
| } |
| |
| // Store the result. |
| m_assembler.str(dataTempRegister, addressTempRegister, ARMThumbImmediate::makeUInt16(0)); |
| |
| return Jump(makeBranch(cond)); |
| } |
| |
| Jump branchMul32(ResultCondition cond, RegisterID src1, RegisterID src2, RegisterID dest) |
| { |
| m_assembler.smull(dest, dataTempRegister, src1, src2); |
| |
| if (cond == Overflow) { |
| m_assembler.asr(addressTempRegister, dest, 31); |
| return branch32(NotEqual, addressTempRegister, dataTempRegister); |
| } |
| |
| return branchTest32(cond, dest); |
| } |
| |
| Jump branchMul32(ResultCondition cond, RegisterID src, RegisterID dest) |
| { |
| return branchMul32(cond, src, dest, dest); |
| } |
| |
| Jump branchMul32(ResultCondition cond, RegisterID src, TrustedImm32 imm, RegisterID dest) |
| { |
| move(imm, dataTempRegister); |
| return branchMul32(cond, dataTempRegister, src, dest); |
| } |
| |
| Jump branchNeg32(ResultCondition cond, RegisterID srcDest) |
| { |
| ARMThumbImmediate zero = ARMThumbImmediate::makeUInt12(0); |
| m_assembler.sub_S(srcDest, zero, srcDest); |
| return Jump(makeBranch(cond)); |
| } |
| |
| Jump branchOr32(ResultCondition cond, RegisterID src, RegisterID dest) |
| { |
| m_assembler.orr_S(dest, dest, src); |
| return Jump(makeBranch(cond)); |
| } |
| |
| Jump branchSub32(ResultCondition cond, RegisterID op1, RegisterID op2, RegisterID dest) |
| { |
| m_assembler.sub_S(dest, op1, op2); |
| return Jump(makeBranch(cond)); |
| } |
| |
| Jump branchSub32(ResultCondition cond, RegisterID op1, TrustedImm32 imm, RegisterID dest) |
| { |
| ARMThumbImmediate armImm = ARMThumbImmediate::makeEncodedImm(imm.m_value); |
| if (armImm.isValid()) |
| m_assembler.sub_S(dest, op1, armImm); |
| else { |
| move(imm, dataTempRegister); |
| m_assembler.sub_S(dest, op1, dataTempRegister); |
| } |
| return Jump(makeBranch(cond)); |
| } |
| |
| Jump branchSub32(ResultCondition cond, RegisterID src, RegisterID dest) |
| { |
| return branchSub32(cond, dest, src, dest); |
| } |
| |
| Jump branchSub32(ResultCondition cond, TrustedImm32 imm, RegisterID dest) |
| { |
| return branchSub32(cond, dest, imm, dest); |
| } |
| |
| void relativeTableJump(RegisterID index, int scale) |
| { |
| ASSERT(scale >= 0 && scale <= 31); |
| |
| // dataTempRegister will point after the jump if index register contains zero |
| move(ARMRegisters::pc, dataTempRegister); |
| m_assembler.add(dataTempRegister, dataTempRegister, ARMThumbImmediate::makeEncodedImm(9)); |
| |
| ShiftTypeAndAmount shift(SRType_LSL, scale); |
| m_assembler.add(dataTempRegister, dataTempRegister, index, shift); |
| jump(dataTempRegister); |
| } |
| |
| // Miscellaneous operations: |
| |
| void breakpoint(uint8_t imm = 0) |
| { |
| m_assembler.bkpt(imm); |
| } |
| |
| static bool isBreakpoint(void* address) { return ARMv7Assembler::isBkpt(address); } |
| |
| ALWAYS_INLINE Call nearCall() |
| { |
| moveFixedWidthEncoding(TrustedImm32(0), dataTempRegister); |
| return Call(m_assembler.blx(dataTempRegister), Call::LinkableNear); |
| } |
| |
| ALWAYS_INLINE Call nearTailCall() |
| { |
| moveFixedWidthEncoding(TrustedImm32(0), dataTempRegister); |
| return Call(m_assembler.bx(dataTempRegister), Call::LinkableNearTail); |
| } |
| |
| ALWAYS_INLINE Call call() |
| { |
| moveFixedWidthEncoding(TrustedImm32(0), dataTempRegister); |
| return Call(m_assembler.blx(dataTempRegister), Call::Linkable); |
| } |
| |
| ALWAYS_INLINE Call call(RegisterID target) |
| { |
| return Call(m_assembler.blx(target), Call::None); |
| } |
| |
| ALWAYS_INLINE Call call(Address address) |
| { |
| load32(address, dataTempRegister); |
| return Call(m_assembler.blx(dataTempRegister), Call::None); |
| } |
| |
| ALWAYS_INLINE void ret() |
| { |
| m_assembler.bx(linkRegister); |
| } |
| |
| void compare32(RelationalCondition cond, RegisterID left, RegisterID right, RegisterID dest) |
| { |
| m_assembler.cmp(left, right); |
| m_assembler.it(armV7Condition(cond), false); |
| m_assembler.mov(dest, ARMThumbImmediate::makeUInt16(1)); |
| m_assembler.mov(dest, ARMThumbImmediate::makeUInt16(0)); |
| } |
| |
| void compare32(RelationalCondition cond, Address left, RegisterID right, RegisterID dest) |
| { |
| load32(left, dataTempRegister); |
| compare32(cond, dataTempRegister, right, dest); |
| } |
| |
| void compare8(RelationalCondition cond, Address left, TrustedImm32 right, RegisterID dest) |
| { |
| TrustedImm32 right8 = MacroAssemblerHelpers::mask8OnCondition(*this, cond, right); |
| MacroAssemblerHelpers::load8OnCondition(*this, cond, left, addressTempRegister); |
| compare32(cond, addressTempRegister, right8, dest); |
| } |
| |
| void compare32(RelationalCondition cond, RegisterID left, TrustedImm32 right, RegisterID dest) |
| { |
| compare32AndSetFlags(left, right); |
| m_assembler.it(armV7Condition(cond), false); |
| m_assembler.mov(dest, ARMThumbImmediate::makeUInt16(1)); |
| m_assembler.mov(dest, ARMThumbImmediate::makeUInt16(0)); |
| } |
| |
| // FIXME: |
| // The mask should be optional... paerhaps the argument order should be |
| // dest-src, operations always have a dest? ... possibly not true, considering |
| // asm ops like test, or pseudo ops like pop(). |
| void test32(ResultCondition cond, Address address, TrustedImm32 mask, RegisterID dest) |
| { |
| load32(address, dataTempRegister); |
| test32(dataTempRegister, mask); |
| m_assembler.it(armV7Condition(cond), false); |
| m_assembler.mov(dest, ARMThumbImmediate::makeUInt16(1)); |
| m_assembler.mov(dest, ARMThumbImmediate::makeUInt16(0)); |
| } |
| |
| void test8(ResultCondition cond, Address address, TrustedImm32 mask, RegisterID dest) |
| { |
| TrustedImm32 mask8 = MacroAssemblerHelpers::mask8OnCondition(*this, cond, mask); |
| MacroAssemblerHelpers::load8OnCondition(*this, cond, address, dataTempRegister); |
| test32(dataTempRegister, mask8); |
| m_assembler.it(armV7Condition(cond), false); |
| m_assembler.mov(dest, ARMThumbImmediate::makeUInt16(1)); |
| m_assembler.mov(dest, ARMThumbImmediate::makeUInt16(0)); |
| } |
| |
| ALWAYS_INLINE DataLabel32 moveWithPatch(TrustedImm32 imm, RegisterID dst) |
| { |
| padBeforePatch(); |
| moveFixedWidthEncoding(imm, dst); |
| return DataLabel32(this); |
| } |
| |
| ALWAYS_INLINE DataLabelPtr moveWithPatch(TrustedImmPtr imm, RegisterID dst) |
| { |
| padBeforePatch(); |
| moveFixedWidthEncoding(TrustedImm32(imm), dst); |
| return DataLabelPtr(this); |
| } |
| |
| ALWAYS_INLINE Jump branchPtrWithPatch(RelationalCondition cond, RegisterID left, DataLabelPtr& dataLabel, TrustedImmPtr initialRightValue = TrustedImmPtr(0)) |
| { |
| dataLabel = moveWithPatch(initialRightValue, dataTempRegister); |
| return branch32(cond, left, dataTempRegister); |
| } |
| |
| ALWAYS_INLINE Jump branchPtrWithPatch(RelationalCondition cond, Address left, DataLabelPtr& dataLabel, TrustedImmPtr initialRightValue = TrustedImmPtr(0)) |
| { |
| load32(left, addressTempRegister); |
| dataLabel = moveWithPatch(initialRightValue, dataTempRegister); |
| return branch32(cond, addressTempRegister, dataTempRegister); |
| } |
| |
| ALWAYS_INLINE Jump branch32WithPatch(RelationalCondition cond, Address left, DataLabel32& dataLabel, TrustedImm32 initialRightValue = TrustedImm32(0)) |
| { |
| load32(left, addressTempRegister); |
| dataLabel = moveWithPatch(initialRightValue, dataTempRegister); |
| return branch32(cond, addressTempRegister, dataTempRegister); |
| } |
| |
| PatchableJump patchableBranchPtr(RelationalCondition cond, Address left, TrustedImmPtr right = TrustedImmPtr(0)) |
| { |
| m_makeJumpPatchable = true; |
| Jump result = branch32(cond, left, TrustedImm32(right)); |
| m_makeJumpPatchable = false; |
| return PatchableJump(result); |
| } |
| |
| PatchableJump patchableBranchTest32(ResultCondition cond, RegisterID reg, TrustedImm32 mask = TrustedImm32(-1)) |
| { |
| m_makeJumpPatchable = true; |
| Jump result = branchTest32(cond, reg, mask); |
| m_makeJumpPatchable = false; |
| return PatchableJump(result); |
| } |
| |
| PatchableJump patchableBranch32(RelationalCondition cond, RegisterID reg, TrustedImm32 imm) |
| { |
| m_makeJumpPatchable = true; |
| Jump result = branch32(cond, reg, imm); |
| m_makeJumpPatchable = false; |
| return PatchableJump(result); |
| } |
| |
| PatchableJump patchableBranch32(RelationalCondition cond, Address left, TrustedImm32 imm) |
| { |
| m_makeJumpPatchable = true; |
| Jump result = branch32(cond, left, imm); |
| m_makeJumpPatchable = false; |
| return PatchableJump(result); |
| } |
| |
| PatchableJump patchableBranchPtrWithPatch(RelationalCondition cond, Address left, DataLabelPtr& dataLabel, TrustedImmPtr initialRightValue = TrustedImmPtr(0)) |
| { |
| m_makeJumpPatchable = true; |
| Jump result = branchPtrWithPatch(cond, left, dataLabel, initialRightValue); |
| m_makeJumpPatchable = false; |
| return PatchableJump(result); |
| } |
| |
| PatchableJump patchableBranch32WithPatch(RelationalCondition cond, Address left, DataLabel32& dataLabel, TrustedImm32 initialRightValue = TrustedImm32(0)) |
| { |
| m_makeJumpPatchable = true; |
| Jump result = branch32WithPatch(cond, left, dataLabel, initialRightValue); |
| m_makeJumpPatchable = false; |
| return PatchableJump(result); |
| } |
| |
| PatchableJump patchableJump() |
| { |
| padBeforePatch(); |
| m_makeJumpPatchable = true; |
| Jump result = jump(); |
| m_makeJumpPatchable = false; |
| return PatchableJump(result); |
| } |
| |
| ALWAYS_INLINE DataLabelPtr storePtrWithPatch(TrustedImmPtr initialValue, ImplicitAddress address) |
| { |
| DataLabelPtr label = moveWithPatch(initialValue, dataTempRegister); |
| store32(dataTempRegister, address); |
| return label; |
| } |
| ALWAYS_INLINE DataLabelPtr storePtrWithPatch(ImplicitAddress address) { return storePtrWithPatch(TrustedImmPtr(0), address); } |
| |
| |
| ALWAYS_INLINE Call tailRecursiveCall() |
| { |
| // Like a normal call, but don't link. |
| moveFixedWidthEncoding(TrustedImm32(0), dataTempRegister); |
| return Call(m_assembler.bx(dataTempRegister), Call::Linkable); |
| } |
| |
| ALWAYS_INLINE Call makeTailRecursiveCall(Jump oldJump) |
| { |
| oldJump.link(this); |
| return tailRecursiveCall(); |
| } |
| |
| |
| static FunctionPtr readCallTarget(CodeLocationCall call) |
| { |
| return FunctionPtr(reinterpret_cast<void(*)()>(ARMv7Assembler::readCallTarget(call.dataLocation()))); |
| } |
| |
| static bool canJumpReplacePatchableBranchPtrWithPatch() { return false; } |
| static bool canJumpReplacePatchableBranch32WithPatch() { return false; } |
| |
| static CodeLocationLabel startOfBranchPtrWithPatchOnRegister(CodeLocationDataLabelPtr label) |
| { |
| const unsigned twoWordOpSize = 4; |
| return label.labelAtOffset(-twoWordOpSize * 2); |
| } |
| |
| static void revertJumpReplacementToBranchPtrWithPatch(CodeLocationLabel instructionStart, RegisterID rd, void* initialValue) |
| { |
| #if OS(LINUX) |
| ARMv7Assembler::revertJumpTo_movT3movtcmpT2(instructionStart.dataLocation(), rd, dataTempRegister, reinterpret_cast<uintptr_t>(initialValue)); |
| #else |
| UNUSED_PARAM(rd); |
| ARMv7Assembler::revertJumpTo_movT3(instructionStart.dataLocation(), dataTempRegister, ARMThumbImmediate::makeUInt16(reinterpret_cast<uintptr_t>(initialValue) & 0xffff)); |
| #endif |
| } |
| |
| static CodeLocationLabel startOfPatchableBranchPtrWithPatchOnAddress(CodeLocationDataLabelPtr) |
| { |
| UNREACHABLE_FOR_PLATFORM(); |
| return CodeLocationLabel(); |
| } |
| |
| static CodeLocationLabel startOfPatchableBranch32WithPatchOnAddress(CodeLocationDataLabel32) |
| { |
| UNREACHABLE_FOR_PLATFORM(); |
| return CodeLocationLabel(); |
| } |
| |
| static void revertJumpReplacementToPatchableBranchPtrWithPatch(CodeLocationLabel, Address, void*) |
| { |
| UNREACHABLE_FOR_PLATFORM(); |
| } |
| |
| static void revertJumpReplacementToPatchableBranch32WithPatch(CodeLocationLabel, Address, int32_t) |
| { |
| UNREACHABLE_FOR_PLATFORM(); |
| } |
| |
| static void repatchCall(CodeLocationCall call, CodeLocationLabel destination) |
| { |
| ARMv7Assembler::relinkCall(call.dataLocation(), destination.executableAddress()); |
| } |
| |
| static void repatchCall(CodeLocationCall call, FunctionPtr destination) |
| { |
| ARMv7Assembler::relinkCall(call.dataLocation(), destination.executableAddress()); |
| } |
| |
| #if ENABLE(MASM_PROBE) |
| void probe(ProbeFunction, void* arg1, void* arg2); |
| #endif // ENABLE(MASM_PROBE) |
| |
| protected: |
| ALWAYS_INLINE Jump jump() |
| { |
| m_assembler.label(); // Force nop-padding if we're in the middle of a watchpoint. |
| moveFixedWidthEncoding(TrustedImm32(0), dataTempRegister); |
| return Jump(m_assembler.bx(dataTempRegister), m_makeJumpPatchable ? ARMv7Assembler::JumpNoConditionFixedSize : ARMv7Assembler::JumpNoCondition); |
| } |
| |
| ALWAYS_INLINE Jump makeBranch(ARMv7Assembler::Condition cond) |
| { |
| m_assembler.label(); // Force nop-padding if we're in the middle of a watchpoint. |
| m_assembler.it(cond, true, true); |
| moveFixedWidthEncoding(TrustedImm32(0), dataTempRegister); |
| return Jump(m_assembler.bx(dataTempRegister), m_makeJumpPatchable ? ARMv7Assembler::JumpConditionFixedSize : ARMv7Assembler::JumpCondition, cond); |
| } |
| ALWAYS_INLINE Jump makeBranch(RelationalCondition cond) { return makeBranch(armV7Condition(cond)); } |
| ALWAYS_INLINE Jump makeBranch(ResultCondition cond) { return makeBranch(armV7Condition(cond)); } |
| ALWAYS_INLINE Jump makeBranch(DoubleCondition cond) { return makeBranch(armV7Condition(cond)); } |
| |
| ArmAddress setupArmAddress(BaseIndex address) |
| { |
| if (address.offset) { |
| ARMThumbImmediate imm = ARMThumbImmediate::makeUInt12OrEncodedImm(address.offset); |
| if (imm.isValid()) |
| m_assembler.add(addressTempRegister, address.base, imm); |
| else { |
| move(TrustedImm32(address.offset), addressTempRegister); |
| m_assembler.add(addressTempRegister, addressTempRegister, address.base); |
| } |
| |
| return ArmAddress(addressTempRegister, address.index, address.scale); |
| } else |
| return ArmAddress(address.base, address.index, address.scale); |
| } |
| |
| ArmAddress setupArmAddress(Address address) |
| { |
| if ((address.offset >= -0xff) && (address.offset <= 0xfff)) |
| return ArmAddress(address.base, address.offset); |
| |
| move(TrustedImm32(address.offset), addressTempRegister); |
| return ArmAddress(address.base, addressTempRegister); |
| } |
| |
| ArmAddress setupArmAddress(ImplicitAddress address) |
| { |
| if ((address.offset >= -0xff) && (address.offset <= 0xfff)) |
| return ArmAddress(address.base, address.offset); |
| |
| move(TrustedImm32(address.offset), addressTempRegister); |
| return ArmAddress(address.base, addressTempRegister); |
| } |
| |
| RegisterID makeBaseIndexBase(BaseIndex address) |
| { |
| if (!address.offset) |
| return address.base; |
| |
| ARMThumbImmediate imm = ARMThumbImmediate::makeUInt12OrEncodedImm(address.offset); |
| if (imm.isValid()) |
| m_assembler.add(addressTempRegister, address.base, imm); |
| else { |
| move(TrustedImm32(address.offset), addressTempRegister); |
| m_assembler.add(addressTempRegister, addressTempRegister, address.base); |
| } |
| |
| return addressTempRegister; |
| } |
| |
| void moveFixedWidthEncoding(TrustedImm32 imm, RegisterID dst) |
| { |
| uint32_t value = imm.m_value; |
| m_assembler.movT3(dst, ARMThumbImmediate::makeUInt16(value & 0xffff)); |
| m_assembler.movt(dst, ARMThumbImmediate::makeUInt16(value >> 16)); |
| } |
| |
| ARMv7Assembler::Condition armV7Condition(RelationalCondition cond) |
| { |
| return static_cast<ARMv7Assembler::Condition>(cond); |
| } |
| |
| ARMv7Assembler::Condition armV7Condition(ResultCondition cond) |
| { |
| return static_cast<ARMv7Assembler::Condition>(cond); |
| } |
| |
| ARMv7Assembler::Condition armV7Condition(DoubleCondition cond) |
| { |
| return static_cast<ARMv7Assembler::Condition>(cond); |
| } |
| |
| private: |
| friend class LinkBuffer; |
| |
| static void linkCall(void* code, Call call, FunctionPtr function) |
| { |
| if (call.isFlagSet(Call::Tail)) |
| ARMv7Assembler::linkJump(code, call.m_label, function.value()); |
| else |
| ARMv7Assembler::linkCall(code, call.m_label, function.value()); |
| } |
| |
| #if ENABLE(MASM_PROBE) |
| inline TrustedImm32 trustedImm32FromPtr(void* ptr) |
| { |
| return TrustedImm32(TrustedImmPtr(ptr)); |
| } |
| |
| inline TrustedImm32 trustedImm32FromPtr(ProbeFunction function) |
| { |
| return TrustedImm32(TrustedImmPtr(reinterpret_cast<void*>(function))); |
| } |
| |
| inline TrustedImm32 trustedImm32FromPtr(void (*function)()) |
| { |
| return TrustedImm32(TrustedImmPtr(reinterpret_cast<void*>(function))); |
| } |
| #endif |
| |
| bool m_makeJumpPatchable; |
| }; |
| |
| } // namespace JSC |
| |
| #endif // ENABLE(ASSEMBLER) |
