typedef ARMv7Assembler::LinkRecord LinkRecord;
typedef ARMv7Assembler::JumpType JumpType;
typedef ARMv7Assembler::JumpLinkType JumpLinkType;
- // Magic number is the biggest useful offset we can get on ARMv7 with
- // a LDR_imm_T2 encoding
- static const int MaximumCompactPtrAlignedAddressOffset = 124;
-
- Vector<LinkRecord>& jumpsToLink() { return m_assembler.jumpsToLink(); }
+ 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(); }
bool canCompact(JumpType jumpType) { return m_assembler.canCompact(jumpType); }
JumpLinkType computeJumpType(JumpType jumpType, const uint8_t* from, const uint8_t* to) { return m_assembler.computeJumpType(jumpType, from, to); }
enum ResultCondition {
Overflow = ARMv7Assembler::ConditionVS,
Signed = ARMv7Assembler::ConditionMI,
+ PositiveOrZero = ARMv7Assembler::ConditionPL,
Zero = ARMv7Assembler::ConditionEQ,
NonZero = ARMv7Assembler::ConditionNE
};
{
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)
{
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);
{
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, RegisterID dest)
{
move(TrustedImmPtr(address), addressTempRegister);
m_assembler.ldr(dest, addressTempRegister, ARMThumbImmediate::makeUInt16(0));
}
+
+ 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)
{
void load8Signed(ImplicitAddress, RegisterID)
{
- unreachableForPlatform();
+ UNREACHABLE_FOR_PLATFORM();
}
void load8(BaseIndex address, RegisterID dest)
return label;
}
- // FIXME: we should be able to plant a compact load relative to/from any base/dest register.
DataLabelCompact load32WithCompactAddressOffsetPatch(Address address, RegisterID dest)
{
+ padBeforePatch();
+
RegisterID base = address.base;
- if (base >= ARMRegisters::r8) {
- move(base, addressTempRegister);
- base = addressTempRegister;
- }
-
DataLabelCompact label(this);
- ASSERT(address.offset >= 0);
- ASSERT(address.offset <= MaximumCompactPtrAlignedAddressOffset);
- ASSERT(ARMThumbImmediate::makeUInt12(address.offset).isUInt7());
+ ASSERT(isCompactPtrAlignedAddressOffset(address.offset));
- if (dest >= ARMRegisters::r8) {
- m_assembler.ldrCompact(addressTempRegister, base, ARMThumbImmediate::makeUInt12(address.offset));
- move(addressTempRegister, dest);
- } else
- m_assembler.ldrCompact(dest, base, ARMThumbImmediate::makeUInt12(address.offset));
+ m_assembler.ldr(dest, base, address.offset, true, false);
return label;
}
void load16Signed(ImplicitAddress, RegisterID)
{
- unreachableForPlatform();
+ UNREACHABLE_FOR_PLATFORM();
}
DataLabel32 store32WithAddressOffsetPatch(RegisterID src, Address 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)
+ {
+ move(imm, 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);
+ }
+
#if ENABLE(JIT_CONSTANT_BLINDING)
static bool shouldBlindForSpecificArch(uint32_t value)
{
// 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)
+ void branchConvertDoubleToInt32(FPRegisterID src, RegisterID dest, JumpList& failureCases, FPRegisterID, bool negZeroCheck = true)
{
m_assembler.vcvt_floatingPointToSigned(fpTempRegisterAsSingle(), src);
m_assembler.vmov(dest, 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!
- failureCases.append(branchTest32(Zero, dest));
+ if (negZeroCheck)
+ failureCases.append(branchTest32(Zero, dest));
}
Jump branchDoubleNonZero(FPRegisterID reg, FPRegisterID)
{
uint32_t value = imm.m_value;
- if (imm.m_isPointer)
- moveFixedWidthEncoding(imm, dest);
- else {
- ARMThumbImmediate armImm = ARMThumbImmediate::makeEncodedImm(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));
- }
+ 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));
}
}
{
m_assembler.nop();
}
+
+ static void replaceWithJump(CodeLocationLabel instructionStart, CodeLocationLabel destination)
+ {
+ ARMv7Assembler::replaceWithJump(instructionStart.dataLocation(), destination.dataLocation());
+ }
+
+ static ptrdiff_t maxJumpReplacementSize()
+ {
+ return ARMv7Assembler::maxJumpReplacementSize();
+ }
// Forwards / external control flow operations:
//
return branchTest32(cond, addressTempRegister, mask);
}
+ Jump branchTest8(ResultCondition cond, AbsoluteAddress address, TrustedImm32 mask = TrustedImm32(-1))
+ {
+ // use addressTempRegister incase the branchTest8 we call uses dataTempRegister. :-/
+ move(TrustedImmPtr(address.m_ptr), addressTempRegister);
+ load8(Address(addressTempRegister), addressTempRegister);
+ return branchTest32(cond, addressTempRegister, mask);
+ }
+
void jump(RegisterID target)
{
m_assembler.bx(target);
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);
}
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 patchableBranchPtrWithPatch(RelationalCondition cond, Address left, DataLabelPtr& dataLabel, TrustedImmPtr initialRightValue = TrustedImmPtr(0))
{
PatchableJump patchableJump()
{
+ padBeforePatch();
m_makeJumpPatchable = true;
Jump result = jump();
m_makeJumpPatchable = false;
{
return FunctionPtr(reinterpret_cast<void(*)()>(ARMv7Assembler::readCallTarget(call.dataLocation())));
}
+
+ static bool canJumpReplacePatchableBranchPtrWithPatch() { 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) || OS(QNX)
+ 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 void revertJumpReplacementToPatchableBranchPtrWithPatch(CodeLocationLabel, Address, void*)
+ {
+ UNREACHABLE_FOR_PLATFORM();
+ }
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);
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