/* * Copyright (C) 2009, 2010 University of Szeged * All rights reserved. * * 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 UNIVERSITY OF SZEGED ``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 UNIVERSITY OF SZEGED 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. */ #ifndef ARMAssembler_h #define ARMAssembler_h #if ENABLE(ASSEMBLER) && CPU(ARM_TRADITIONAL) #include "AssemblerBufferWithConstantPool.h" #include "JITCompilationEffort.h" #include namespace JSC { typedef uint32_t ARMWord; namespace ARMRegisters { typedef enum { r0 = 0, r1, r2, r3, r4, r5, r6, S0 = r6, r7, r8, r9, r10, r11, r12, S1 = r12, r13, sp = r13, r14, lr = r14, r15, pc = r15 } RegisterID; typedef enum { d0, d1, d2, d3, d4, d5, d6, d7, SD0 = d7, /* Same as thumb assembler. */ d8, d9, d10, d11, d12, d13, d14, d15, d16, d17, d18, d19, d20, d21, d22, d23, d24, d25, d26, d27, d28, d29, d30, d31 } FPRegisterID; } // namespace ARMRegisters class ARMAssembler { public: typedef ARMRegisters::RegisterID RegisterID; typedef ARMRegisters::FPRegisterID FPRegisterID; typedef AssemblerBufferWithConstantPool<2048, 4, 4, ARMAssembler> ARMBuffer; typedef SegmentedVector Jumps; ARMAssembler() : m_indexOfTailOfLastWatchpoint(1) { } // ARM conditional constants typedef enum { EQ = 0x00000000, // Zero NE = 0x10000000, // Non-zero CS = 0x20000000, CC = 0x30000000, MI = 0x40000000, PL = 0x50000000, VS = 0x60000000, VC = 0x70000000, HI = 0x80000000, LS = 0x90000000, GE = 0xa0000000, LT = 0xb0000000, GT = 0xc0000000, LE = 0xd0000000, AL = 0xe0000000 } Condition; // ARM instruction constants enum { AND = (0x0 << 21), EOR = (0x1 << 21), SUB = (0x2 << 21), RSB = (0x3 << 21), ADD = (0x4 << 21), ADC = (0x5 << 21), SBC = (0x6 << 21), RSC = (0x7 << 21), TST = (0x8 << 21), TEQ = (0x9 << 21), CMP = (0xa << 21), CMN = (0xb << 21), ORR = (0xc << 21), MOV = (0xd << 21), BIC = (0xe << 21), MVN = (0xf << 21), MUL = 0x00000090, MULL = 0x00c00090, VMOV_F64 = 0x0eb00b40, VADD_F64 = 0x0e300b00, VDIV_F64 = 0x0e800b00, VSUB_F64 = 0x0e300b40, VMUL_F64 = 0x0e200b00, VCMP_F64 = 0x0eb40b40, VSQRT_F64 = 0x0eb10bc0, VABS_F64 = 0x0eb00bc0, VNEG_F64 = 0x0eb10b40, STMDB = 0x09200000, LDMIA = 0x08b00000, B = 0x0a000000, BL = 0x0b000000, BX = 0x012fff10, VMOV_VFP64 = 0x0c400a10, VMOV_ARM64 = 0x0c500a10, VMOV_VFP32 = 0x0e000a10, VMOV_ARM32 = 0x0e100a10, VCVT_F64_S32 = 0x0eb80bc0, VCVT_S32_F64 = 0x0ebd0b40, VCVT_U32_F64 = 0x0ebc0b40, VCVT_F32_F64 = 0x0eb70bc0, VCVT_F64_F32 = 0x0eb70ac0, VMRS_APSR = 0x0ef1fa10, CLZ = 0x016f0f10, BKPT = 0xe1200070, BLX = 0x012fff30, #if WTF_ARM_ARCH_AT_LEAST(7) MOVW = 0x03000000, MOVT = 0x03400000, #endif NOP = 0xe1a00000, }; enum { Op2Immediate = (1 << 25), ImmediateForHalfWordTransfer = (1 << 22), Op2InvertedImmediate = (1 << 26), SetConditionalCodes = (1 << 20), Op2IsRegisterArgument = (1 << 25), // Data transfer flags. DataTransferUp = (1 << 23), DataTransferWriteBack = (1 << 21), DataTransferPostUpdate = (1 << 24), DataTransferLoad = (1 << 20), ByteDataTransfer = (1 << 22), }; enum DataTransferTypeA { LoadUint32 = 0x05000000 | DataTransferLoad, LoadUint8 = 0x05400000 | DataTransferLoad, StoreUint32 = 0x05000000, StoreUint8 = 0x05400000, }; enum DataTransferTypeB { LoadUint16 = 0x010000b0 | DataTransferLoad, LoadInt16 = 0x010000f0 | DataTransferLoad, LoadInt8 = 0x010000d0 | DataTransferLoad, StoreUint16 = 0x010000b0, }; enum DataTransferTypeFloat { LoadFloat = 0x0d000a00 | DataTransferLoad, LoadDouble = 0x0d000b00 | DataTransferLoad, StoreFloat = 0x0d000a00, StoreDouble = 0x0d000b00, }; // Masks of ARM instructions enum { BranchOffsetMask = 0x00ffffff, ConditionalFieldMask = 0xf0000000, DataTransferOffsetMask = 0xfff, }; enum { MinimumBranchOffsetDistance = -0x00800000, MaximumBranchOffsetDistance = 0x007fffff, }; enum { padForAlign8 = 0x00, padForAlign16 = 0x0000, padForAlign32 = 0xe12fff7f // 'bkpt 0xffff' instruction. }; static const ARMWord InvalidImmediate = 0xf0000000; static const ARMWord InvalidBranchTarget = 0xffffffff; static const int DefaultPrefetchOffset = 2; static const ARMWord BlxInstructionMask = 0x012fff30; static const ARMWord LdrOrAddInstructionMask = 0x0ff00000; static const ARMWord LdrPcImmediateInstructionMask = 0x0f7f0000; static const ARMWord AddImmediateInstruction = 0x02800000; static const ARMWord BlxInstruction = 0x012fff30; static const ARMWord LdrImmediateInstruction = 0x05900000; static const ARMWord LdrPcImmediateInstruction = 0x051f0000; // Instruction formating void emitInstruction(ARMWord op, int rd, int rn, ARMWord op2) { ASSERT(((op2 & ~Op2Immediate) <= 0xfff) || (((op2 & ~ImmediateForHalfWordTransfer) <= 0xfff))); m_buffer.putInt(op | RN(rn) | RD(rd) | op2); } void emitDoublePrecisionInstruction(ARMWord op, int dd, int dn, int dm) { ASSERT((dd >= 0 && dd <= 31) && (dn >= 0 && dn <= 31) && (dm >= 0 && dm <= 31)); m_buffer.putInt(op | ((dd & 0xf) << 12) | ((dd & 0x10) << (22 - 4)) | ((dn & 0xf) << 16) | ((dn & 0x10) << (7 - 4)) | (dm & 0xf) | ((dm & 0x10) << (5 - 4))); } void emitSinglePrecisionInstruction(ARMWord op, int sd, int sn, int sm) { ASSERT((sd >= 0 && sd <= 31) && (sn >= 0 && sn <= 31) && (sm >= 0 && sm <= 31)); m_buffer.putInt(op | ((sd >> 1) << 12) | ((sd & 0x1) << 22) | ((sn >> 1) << 16) | ((sn & 0x1) << 7) | (sm >> 1) | ((sm & 0x1) << 5)); } void bitAnd(int rd, int rn, ARMWord op2, Condition cc = AL) { emitInstruction(toARMWord(cc) | AND, rd, rn, op2); } void bitAnds(int rd, int rn, ARMWord op2, Condition cc = AL) { emitInstruction(toARMWord(cc) | AND | SetConditionalCodes, rd, rn, op2); } void eor(int rd, int rn, ARMWord op2, Condition cc = AL) { emitInstruction(toARMWord(cc) | EOR, rd, rn, op2); } void eors(int rd, int rn, ARMWord op2, Condition cc = AL) { emitInstruction(toARMWord(cc) | EOR | SetConditionalCodes, rd, rn, op2); } void sub(int rd, int rn, ARMWord op2, Condition cc = AL) { emitInstruction(toARMWord(cc) | SUB, rd, rn, op2); } void subs(int rd, int rn, ARMWord op2, Condition cc = AL) { emitInstruction(toARMWord(cc) | SUB | SetConditionalCodes, rd, rn, op2); } void rsb(int rd, int rn, ARMWord op2, Condition cc = AL) { emitInstruction(toARMWord(cc) | RSB, rd, rn, op2); } void rsbs(int rd, int rn, ARMWord op2, Condition cc = AL) { emitInstruction(toARMWord(cc) | RSB | SetConditionalCodes, rd, rn, op2); } void add(int rd, int rn, ARMWord op2, Condition cc = AL) { emitInstruction(toARMWord(cc) | ADD, rd, rn, op2); } void adds(int rd, int rn, ARMWord op2, Condition cc = AL) { emitInstruction(toARMWord(cc) | ADD | SetConditionalCodes, rd, rn, op2); } void adc(int rd, int rn, ARMWord op2, Condition cc = AL) { emitInstruction(toARMWord(cc) | ADC, rd, rn, op2); } void adcs(int rd, int rn, ARMWord op2, Condition cc = AL) { emitInstruction(toARMWord(cc) | ADC | SetConditionalCodes, rd, rn, op2); } void sbc(int rd, int rn, ARMWord op2, Condition cc = AL) { emitInstruction(toARMWord(cc) | SBC, rd, rn, op2); } void sbcs(int rd, int rn, ARMWord op2, Condition cc = AL) { emitInstruction(toARMWord(cc) | SBC | SetConditionalCodes, rd, rn, op2); } void rsc(int rd, int rn, ARMWord op2, Condition cc = AL) { emitInstruction(toARMWord(cc) | RSC, rd, rn, op2); } void rscs(int rd, int rn, ARMWord op2, Condition cc = AL) { emitInstruction(toARMWord(cc) | RSC | SetConditionalCodes, rd, rn, op2); } void tst(int rn, ARMWord op2, Condition cc = AL) { emitInstruction(toARMWord(cc) | TST | SetConditionalCodes, 0, rn, op2); } void teq(int rn, ARMWord op2, Condition cc = AL) { emitInstruction(toARMWord(cc) | TEQ | SetConditionalCodes, 0, rn, op2); } void cmp(int rn, ARMWord op2, Condition cc = AL) { emitInstruction(toARMWord(cc) | CMP | SetConditionalCodes, 0, rn, op2); } void cmn(int rn, ARMWord op2, Condition cc = AL) { emitInstruction(toARMWord(cc) | CMN | SetConditionalCodes, 0, rn, op2); } void orr(int rd, int rn, ARMWord op2, Condition cc = AL) { emitInstruction(toARMWord(cc) | ORR, rd, rn, op2); } void orrs(int rd, int rn, ARMWord op2, Condition cc = AL) { emitInstruction(toARMWord(cc) | ORR | SetConditionalCodes, rd, rn, op2); } void mov(int rd, ARMWord op2, Condition cc = AL) { emitInstruction(toARMWord(cc) | MOV, rd, ARMRegisters::r0, op2); } #if WTF_ARM_ARCH_AT_LEAST(7) void movw(int rd, ARMWord op2, Condition cc = AL) { ASSERT((op2 | 0xf0fff) == 0xf0fff); m_buffer.putInt(toARMWord(cc) | MOVW | RD(rd) | op2); } void movt(int rd, ARMWord op2, Condition cc = AL) { ASSERT((op2 | 0xf0fff) == 0xf0fff); m_buffer.putInt(toARMWord(cc) | MOVT | RD(rd) | op2); } #endif void movs(int rd, ARMWord op2, Condition cc = AL) { emitInstruction(toARMWord(cc) | MOV | SetConditionalCodes, rd, ARMRegisters::r0, op2); } void bic(int rd, int rn, ARMWord op2, Condition cc = AL) { emitInstruction(toARMWord(cc) | BIC, rd, rn, op2); } void bics(int rd, int rn, ARMWord op2, Condition cc = AL) { emitInstruction(toARMWord(cc) | BIC | SetConditionalCodes, rd, rn, op2); } void mvn(int rd, ARMWord op2, Condition cc = AL) { emitInstruction(toARMWord(cc) | MVN, rd, ARMRegisters::r0, op2); } void mvns(int rd, ARMWord op2, Condition cc = AL) { emitInstruction(toARMWord(cc) | MVN | SetConditionalCodes, rd, ARMRegisters::r0, op2); } void mul(int rd, int rn, int rm, Condition cc = AL) { m_buffer.putInt(toARMWord(cc) | MUL | RN(rd) | RS(rn) | RM(rm)); } void muls(int rd, int rn, int rm, Condition cc = AL) { m_buffer.putInt(toARMWord(cc) | MUL | SetConditionalCodes | RN(rd) | RS(rn) | RM(rm)); } void mull(int rdhi, int rdlo, int rn, int rm, Condition cc = AL) { m_buffer.putInt(toARMWord(cc) | MULL | RN(rdhi) | RD(rdlo) | RS(rn) | RM(rm)); } void vmov_f64(int dd, int dm, Condition cc = AL) { emitDoublePrecisionInstruction(toARMWord(cc) | VMOV_F64, dd, 0, dm); } void vadd_f64(int dd, int dn, int dm, Condition cc = AL) { emitDoublePrecisionInstruction(toARMWord(cc) | VADD_F64, dd, dn, dm); } void vdiv_f64(int dd, int dn, int dm, Condition cc = AL) { emitDoublePrecisionInstruction(toARMWord(cc) | VDIV_F64, dd, dn, dm); } void vsub_f64(int dd, int dn, int dm, Condition cc = AL) { emitDoublePrecisionInstruction(toARMWord(cc) | VSUB_F64, dd, dn, dm); } void vmul_f64(int dd, int dn, int dm, Condition cc = AL) { emitDoublePrecisionInstruction(toARMWord(cc) | VMUL_F64, dd, dn, dm); } void vcmp_f64(int dd, int dm, Condition cc = AL) { emitDoublePrecisionInstruction(toARMWord(cc) | VCMP_F64, dd, 0, dm); } void vsqrt_f64(int dd, int dm, Condition cc = AL) { emitDoublePrecisionInstruction(toARMWord(cc) | VSQRT_F64, dd, 0, dm); } void vabs_f64(int dd, int dm, Condition cc = AL) { emitDoublePrecisionInstruction(toARMWord(cc) | VABS_F64, dd, 0, dm); } void vneg_f64(int dd, int dm, Condition cc = AL) { emitDoublePrecisionInstruction(toARMWord(cc) | VNEG_F64, dd, 0, dm); } void ldrImmediate(int rd, ARMWord imm, Condition cc = AL) { m_buffer.putIntWithConstantInt(toARMWord(cc) | LoadUint32 | DataTransferUp | RN(ARMRegisters::pc) | RD(rd), imm, true); } void ldrUniqueImmediate(int rd, ARMWord imm, Condition cc = AL) { m_buffer.putIntWithConstantInt(toARMWord(cc) | LoadUint32 | DataTransferUp | RN(ARMRegisters::pc) | RD(rd), imm); } void dtrUp(DataTransferTypeA transferType, int rd, int rb, ARMWord op2, Condition cc = AL) { emitInstruction(toARMWord(cc) | transferType | DataTransferUp, rd, rb, op2); } void dtrUpRegister(DataTransferTypeA transferType, int rd, int rb, int rm, Condition cc = AL) { emitInstruction(toARMWord(cc) | transferType | DataTransferUp | Op2IsRegisterArgument, rd, rb, rm); } void dtrDown(DataTransferTypeA transferType, int rd, int rb, ARMWord op2, Condition cc = AL) { emitInstruction(toARMWord(cc) | transferType, rd, rb, op2); } void dtrDownRegister(DataTransferTypeA transferType, int rd, int rb, int rm, Condition cc = AL) { emitInstruction(toARMWord(cc) | transferType | Op2IsRegisterArgument, rd, rb, rm); } void halfDtrUp(DataTransferTypeB transferType, int rd, int rb, ARMWord op2, Condition cc = AL) { emitInstruction(toARMWord(cc) | transferType | DataTransferUp, rd, rb, op2); } void halfDtrUpRegister(DataTransferTypeB transferType, int rd, int rn, int rm, Condition cc = AL) { emitInstruction(toARMWord(cc) | transferType | DataTransferUp, rd, rn, rm); } void halfDtrDown(DataTransferTypeB transferType, int rd, int rb, ARMWord op2, Condition cc = AL) { emitInstruction(toARMWord(cc) | transferType, rd, rb, op2); } void halfDtrDownRegister(DataTransferTypeB transferType, int rd, int rn, int rm, Condition cc = AL) { emitInstruction(toARMWord(cc) | transferType, rd, rn, rm); } void doubleDtrUp(DataTransferTypeFloat type, int rd, int rb, ARMWord op2, Condition cc = AL) { ASSERT(op2 <= 0xff && rd <= 15); /* Only d0-d15 and s0, s2, s4 ... s30 are supported. */ m_buffer.putInt(toARMWord(cc) | DataTransferUp | type | (rd << 12) | RN(rb) | op2); } void doubleDtrDown(DataTransferTypeFloat type, int rd, int rb, ARMWord op2, Condition cc = AL) { ASSERT(op2 <= 0xff && rd <= 15); /* Only d0-d15 and s0, s2, s4 ... s30 are supported. */ m_buffer.putInt(toARMWord(cc) | type | (rd << 12) | RN(rb) | op2); } void push(int reg, Condition cc = AL) { ASSERT(ARMWord(reg) <= 0xf); m_buffer.putInt(toARMWord(cc) | StoreUint32 | DataTransferWriteBack | RN(ARMRegisters::sp) | RD(reg) | 0x4); } void pop(int reg, Condition cc = AL) { ASSERT(ARMWord(reg) <= 0xf); m_buffer.putInt(toARMWord(cc) | (LoadUint32 ^ DataTransferPostUpdate) | DataTransferUp | RN(ARMRegisters::sp) | RD(reg) | 0x4); } inline void poke(int reg, Condition cc = AL) { dtrDown(StoreUint32, ARMRegisters::sp, 0, reg, cc); } inline void peek(int reg, Condition cc = AL) { dtrUp(LoadUint32, reg, ARMRegisters::sp, 0, cc); } void vmov_vfp64(int sm, int rt, int rt2, Condition cc = AL) { ASSERT(rt != rt2); m_buffer.putInt(toARMWord(cc) | VMOV_VFP64 | RN(rt2) | RD(rt) | (sm & 0xf) | ((sm & 0x10) << (5 - 4))); } void vmov_arm64(int rt, int rt2, int sm, Condition cc = AL) { ASSERT(rt != rt2); m_buffer.putInt(toARMWord(cc) | VMOV_ARM64 | RN(rt2) | RD(rt) | (sm & 0xf) | ((sm & 0x10) << (5 - 4))); } void vmov_vfp32(int sn, int rt, Condition cc = AL) { ASSERT(rt <= 15); emitSinglePrecisionInstruction(toARMWord(cc) | VMOV_VFP32, rt << 1, sn, 0); } void vmov_arm32(int rt, int sn, Condition cc = AL) { ASSERT(rt <= 15); emitSinglePrecisionInstruction(toARMWord(cc) | VMOV_ARM32, rt << 1, sn, 0); } void vcvt_f64_s32(int dd, int sm, Condition cc = AL) { ASSERT(!(sm & 0x1)); // sm must be divisible by 2 emitDoublePrecisionInstruction(toARMWord(cc) | VCVT_F64_S32, dd, 0, (sm >> 1)); } void vcvt_s32_f64(int sd, int dm, Condition cc = AL) { ASSERT(!(sd & 0x1)); // sd must be divisible by 2 emitDoublePrecisionInstruction(toARMWord(cc) | VCVT_S32_F64, (sd >> 1), 0, dm); } void vcvt_u32_f64(int sd, int dm, Condition cc = AL) { ASSERT(!(sd & 0x1)); // sd must be divisible by 2 emitDoublePrecisionInstruction(toARMWord(cc) | VCVT_U32_F64, (sd >> 1), 0, dm); } void vcvt_f64_f32(int dd, int sm, Condition cc = AL) { ASSERT(dd <= 15 && sm <= 15); emitDoublePrecisionInstruction(toARMWord(cc) | VCVT_F64_F32, dd, 0, sm); } void vcvt_f32_f64(int dd, int sm, Condition cc = AL) { ASSERT(dd <= 15 && sm <= 15); emitDoublePrecisionInstruction(toARMWord(cc) | VCVT_F32_F64, dd, 0, sm); } void vmrs_apsr(Condition cc = AL) { m_buffer.putInt(toARMWord(cc) | VMRS_APSR); } void clz(int rd, int rm, Condition cc = AL) { m_buffer.putInt(toARMWord(cc) | CLZ | RD(rd) | RM(rm)); } void bkpt(ARMWord value) { m_buffer.putInt(BKPT | ((value & 0xff0) << 4) | (value & 0xf)); } void nop() { m_buffer.putInt(NOP); } void bx(int rm, Condition cc = AL) { emitInstruction(toARMWord(cc) | BX, 0, 0, RM(rm)); } AssemblerLabel blx(int rm, Condition cc = AL) { emitInstruction(toARMWord(cc) | BLX, 0, 0, RM(rm)); return m_buffer.label(); } static ARMWord lsl(int reg, ARMWord value) { ASSERT(reg <= ARMRegisters::pc); ASSERT(value <= 0x1f); return reg | (value << 7) | 0x00; } static ARMWord lsr(int reg, ARMWord value) { ASSERT(reg <= ARMRegisters::pc); ASSERT(value <= 0x1f); return reg | (value << 7) | 0x20; } static ARMWord asr(int reg, ARMWord value) { ASSERT(reg <= ARMRegisters::pc); ASSERT(value <= 0x1f); return reg | (value << 7) | 0x40; } static ARMWord lslRegister(int reg, int shiftReg) { ASSERT(reg <= ARMRegisters::pc); ASSERT(shiftReg <= ARMRegisters::pc); return reg | (shiftReg << 8) | 0x10; } static ARMWord lsrRegister(int reg, int shiftReg) { ASSERT(reg <= ARMRegisters::pc); ASSERT(shiftReg <= ARMRegisters::pc); return reg | (shiftReg << 8) | 0x30; } static ARMWord asrRegister(int reg, int shiftReg) { ASSERT(reg <= ARMRegisters::pc); ASSERT(shiftReg <= ARMRegisters::pc); return reg | (shiftReg << 8) | 0x50; } // General helpers size_t codeSize() const { return m_buffer.codeSize(); } void ensureSpace(int insnSpace, int constSpace) { m_buffer.ensureSpace(insnSpace, constSpace); } int sizeOfConstantPool() { return m_buffer.sizeOfConstantPool(); } AssemblerLabel labelIgnoringWatchpoints() { m_buffer.ensureSpaceForAnyInstruction(); return m_buffer.label(); } AssemblerLabel labelForWatchpoint() { m_buffer.ensureSpaceForAnyInstruction(maxJumpReplacementSize() / sizeof(ARMWord)); AssemblerLabel result = m_buffer.label(); if (result.m_offset != (m_indexOfTailOfLastWatchpoint - maxJumpReplacementSize())) result = label(); m_indexOfTailOfLastWatchpoint = result.m_offset + maxJumpReplacementSize(); return label(); } AssemblerLabel label() { AssemblerLabel result = labelIgnoringWatchpoints(); while (result.m_offset + 1 < m_indexOfTailOfLastWatchpoint) { nop(); // The available number of instructions are ensured by labelForWatchpoint. result = m_buffer.label(); } return result; } AssemblerLabel align(int alignment) { while (!m_buffer.isAligned(alignment)) mov(ARMRegisters::r0, ARMRegisters::r0); return label(); } AssemblerLabel loadBranchTarget(int rd, Condition cc = AL, int useConstantPool = 0) { ensureSpace(sizeof(ARMWord), sizeof(ARMWord)); m_jumps.append(m_buffer.codeSize() | (useConstantPool & 0x1)); ldrUniqueImmediate(rd, InvalidBranchTarget, cc); return m_buffer.label(); } AssemblerLabel jmp(Condition cc = AL, int useConstantPool = 0) { return loadBranchTarget(ARMRegisters::pc, cc, useConstantPool); } PassRefPtr executableCopy(JSGlobalData&, void* ownerUID, JITCompilationEffort); unsigned debugOffset() { return m_buffer.debugOffset(); } // DFG assembly helpers for moving data between fp and registers. void vmov(RegisterID rd1, RegisterID rd2, FPRegisterID rn) { vmov_arm64(rd1, rd2, rn); } void vmov(FPRegisterID rd, RegisterID rn1, RegisterID rn2) { vmov_vfp64(rd, rn1, rn2); } // Patching helpers static ARMWord* getLdrImmAddress(ARMWord* insn) { // Check for call if ((*insn & LdrPcImmediateInstructionMask) != LdrPcImmediateInstruction) { // Must be BLX ASSERT((*insn & BlxInstructionMask) == BlxInstruction); insn--; } // Must be an ldr ..., [pc +/- imm] ASSERT((*insn & LdrPcImmediateInstructionMask) == LdrPcImmediateInstruction); ARMWord addr = reinterpret_cast(insn) + DefaultPrefetchOffset * sizeof(ARMWord); if (*insn & DataTransferUp) return reinterpret_cast(addr + (*insn & DataTransferOffsetMask)); return reinterpret_cast(addr - (*insn & DataTransferOffsetMask)); } static ARMWord* getLdrImmAddressOnPool(ARMWord* insn, uint32_t* constPool) { // Must be an ldr ..., [pc +/- imm] ASSERT((*insn & LdrPcImmediateInstructionMask) == LdrPcImmediateInstruction); if (*insn & 0x1) return reinterpret_cast(constPool + ((*insn & DataTransferOffsetMask) >> 1)); return getLdrImmAddress(insn); } static void patchPointerInternal(intptr_t from, void* to) { ARMWord* insn = reinterpret_cast(from); ARMWord* addr = getLdrImmAddress(insn); *addr = reinterpret_cast(to); } static ARMWord patchConstantPoolLoad(ARMWord load, ARMWord value) { value = (value << 1) + 1; ASSERT(!(value & ~DataTransferOffsetMask)); return (load & ~DataTransferOffsetMask) | value; } static void patchConstantPoolLoad(void* loadAddr, void* constPoolAddr); // Read pointers static void* readPointer(void* from) { ARMWord* instruction = reinterpret_cast(from); ARMWord* address = getLdrImmAddress(instruction); return *reinterpret_cast(address); } // Patch pointers static void linkPointer(void* code, AssemblerLabel from, void* to) { patchPointerInternal(reinterpret_cast(code) + from.m_offset, to); } static void repatchInt32(void* where, int32_t to) { patchPointerInternal(reinterpret_cast(where), reinterpret_cast(to)); } static void repatchCompact(void* where, int32_t value) { ARMWord* instruction = reinterpret_cast(where); ASSERT((*instruction & 0x0f700000) == LoadUint32); if (value >= 0) *instruction = (*instruction & 0xff7ff000) | DataTransferUp | value; else *instruction = (*instruction & 0xff7ff000) | -value; cacheFlush(instruction, sizeof(ARMWord)); } static void repatchPointer(void* from, void* to) { patchPointerInternal(reinterpret_cast(from), to); } // Linkers static intptr_t getAbsoluteJumpAddress(void* base, int offset = 0) { return reinterpret_cast(base) + offset - sizeof(ARMWord); } void linkJump(AssemblerLabel from, AssemblerLabel to) { ARMWord* insn = reinterpret_cast(getAbsoluteJumpAddress(m_buffer.data(), from.m_offset)); ARMWord* addr = getLdrImmAddressOnPool(insn, m_buffer.poolAddress()); *addr = toARMWord(to.m_offset); } static void linkJump(void* code, AssemblerLabel from, void* to) { patchPointerInternal(getAbsoluteJumpAddress(code, from.m_offset), to); } static void relinkJump(void* from, void* to) { patchPointerInternal(getAbsoluteJumpAddress(from), to); } static void linkCall(void* code, AssemblerLabel from, void* to) { patchPointerInternal(getAbsoluteJumpAddress(code, from.m_offset), to); } static void relinkCall(void* from, void* to) { patchPointerInternal(getAbsoluteJumpAddress(from), to); } static void* readCallTarget(void* from) { return reinterpret_cast(readPointer(reinterpret_cast(getAbsoluteJumpAddress(from)))); } static void replaceWithJump(void* instructionStart, void* to) { ARMWord* instruction = reinterpret_cast(instructionStart); intptr_t difference = reinterpret_cast(to) - (reinterpret_cast(instruction) + DefaultPrefetchOffset * sizeof(ARMWord)); if (!(difference & 1)) { difference >>= 2; if ((difference <= MaximumBranchOffsetDistance && difference >= MinimumBranchOffsetDistance)) { // Direct branch. instruction[0] = B | AL | (difference & BranchOffsetMask); cacheFlush(instruction, sizeof(ARMWord)); return; } } // Load target. instruction[0] = LoadUint32 | AL | RN(ARMRegisters::pc) | RD(ARMRegisters::pc) | 4; instruction[1] = reinterpret_cast(to); cacheFlush(instruction, sizeof(ARMWord) * 2); } static ptrdiff_t maxJumpReplacementSize() { return sizeof(ARMWord) * 2; } static void replaceWithLoad(void* instructionStart) { ARMWord* instruction = reinterpret_cast(instructionStart); cacheFlush(instruction, sizeof(ARMWord)); ASSERT((*instruction & LdrOrAddInstructionMask) == AddImmediateInstruction || (*instruction & LdrOrAddInstructionMask) == LdrImmediateInstruction); if ((*instruction & LdrOrAddInstructionMask) == AddImmediateInstruction) { *instruction = (*instruction & ~LdrOrAddInstructionMask) | LdrImmediateInstruction; cacheFlush(instruction, sizeof(ARMWord)); } } static void replaceWithAddressComputation(void* instructionStart) { ARMWord* instruction = reinterpret_cast(instructionStart); cacheFlush(instruction, sizeof(ARMWord)); ASSERT((*instruction & LdrOrAddInstructionMask) == AddImmediateInstruction || (*instruction & LdrOrAddInstructionMask) == LdrImmediateInstruction); if ((*instruction & LdrOrAddInstructionMask) == LdrImmediateInstruction) { *instruction = (*instruction & ~LdrOrAddInstructionMask) | AddImmediateInstruction; cacheFlush(instruction, sizeof(ARMWord)); } } static void revertBranchPtrWithPatch(void* instructionStart, RegisterID rn, ARMWord imm) { ARMWord* instruction = reinterpret_cast(instructionStart); ASSERT((instruction[2] & LdrPcImmediateInstructionMask) == LdrPcImmediateInstruction); instruction[0] = toARMWord(AL) | ((instruction[2] & 0x0fff0fff) + sizeof(ARMWord)) | RD(ARMRegisters::S1); *getLdrImmAddress(instruction) = imm; instruction[1] = toARMWord(AL) | CMP | SetConditionalCodes | RN(rn) | RM(ARMRegisters::S1); cacheFlush(instruction, 2 * sizeof(ARMWord)); } // Address operations static void* getRelocatedAddress(void* code, AssemblerLabel label) { return reinterpret_cast(reinterpret_cast(code) + label.m_offset); } // Address differences static int getDifferenceBetweenLabels(AssemblerLabel a, AssemblerLabel b) { return b.m_offset - a.m_offset; } static unsigned getCallReturnOffset(AssemblerLabel call) { return call.m_offset; } // Handle immediates static ARMWord getOp2(ARMWord imm); // Fast case if imm is known to be between 0 and 0xff static ARMWord getOp2Byte(ARMWord imm) { ASSERT(imm <= 0xff); return Op2Immediate | imm; } static ARMWord getOp2Half(ARMWord imm) { ASSERT(imm <= 0xff); return ImmediateForHalfWordTransfer | (imm & 0x0f) | ((imm & 0xf0) << 4); } #if WTF_ARM_ARCH_AT_LEAST(7) static ARMWord getImm16Op2(ARMWord imm) { if (imm <= 0xffff) return (imm & 0xf000) << 4 | (imm & 0xfff); return InvalidImmediate; } #endif ARMWord getImm(ARMWord imm, int tmpReg, bool invert = false); void moveImm(ARMWord imm, int dest); ARMWord encodeComplexImm(ARMWord imm, int dest); // Memory load/store helpers void dataTransfer32(DataTransferTypeA, RegisterID srcDst, RegisterID base, int32_t offset); void baseIndexTransfer32(DataTransferTypeA, RegisterID srcDst, RegisterID base, RegisterID index, int scale, int32_t offset); void dataTransfer16(DataTransferTypeB, RegisterID srcDst, RegisterID base, int32_t offset); void baseIndexTransfer16(DataTransferTypeB, RegisterID srcDst, RegisterID base, RegisterID index, int scale, int32_t offset); void dataTransferFloat(DataTransferTypeFloat, FPRegisterID srcDst, RegisterID base, int32_t offset); void baseIndexTransferFloat(DataTransferTypeFloat, FPRegisterID srcDst, RegisterID base, RegisterID index, int scale, int32_t offset); // Constant pool hnadlers static ARMWord placeConstantPoolBarrier(int offset) { offset = (offset - sizeof(ARMWord)) >> 2; ASSERT((offset <= MaximumBranchOffsetDistance && offset >= MinimumBranchOffsetDistance)); return AL | B | (offset & BranchOffsetMask); } #if OS(LINUX) && COMPILER(GCC) static inline void linuxPageFlush(uintptr_t begin, uintptr_t end) { asm volatile( "push {r7}\n" "mov r0, %0\n" "mov r1, %1\n" "mov r7, #0xf0000\n" "add r7, r7, #0x2\n" "mov r2, #0x0\n" "svc 0x0\n" "pop {r7}\n" : : "r" (begin), "r" (end) : "r0", "r1", "r2"); } #endif #if OS(LINUX) && COMPILER(RVCT) static __asm void cacheFlush(void* code, size_t); #else static void cacheFlush(void* code, size_t size) { #if OS(LINUX) && COMPILER(GCC) size_t page = pageSize(); uintptr_t current = reinterpret_cast(code); uintptr_t end = current + size; uintptr_t firstPageEnd = (current & ~(page - 1)) + page; if (end <= firstPageEnd) { linuxPageFlush(current, end); return; } linuxPageFlush(current, firstPageEnd); for (current = firstPageEnd; current + page < end; current += page) linuxPageFlush(current, current + page); linuxPageFlush(current, end); #elif OS(WINCE) CacheRangeFlush(code, size, CACHE_SYNC_ALL); #elif OS(QNX) && ENABLE(ASSEMBLER_WX_EXCLUSIVE) UNUSED_PARAM(code); UNUSED_PARAM(size); #elif OS(QNX) msync(code, size, MS_INVALIDATE_ICACHE); #else #error "The cacheFlush support is missing on this platform." #endif } #endif private: static ARMWord RM(int reg) { ASSERT(reg <= ARMRegisters::pc); return reg; } static ARMWord RS(int reg) { ASSERT(reg <= ARMRegisters::pc); return reg << 8; } static ARMWord RD(int reg) { ASSERT(reg <= ARMRegisters::pc); return reg << 12; } static ARMWord RN(int reg) { ASSERT(reg <= ARMRegisters::pc); return reg << 16; } static ARMWord getConditionalField(ARMWord i) { return i & ConditionalFieldMask; } static ARMWord toARMWord(Condition cc) { return static_cast(cc); } static ARMWord toARMWord(uint32_t u) { return static_cast(u); } int genInt(int reg, ARMWord imm, bool positive); ARMBuffer m_buffer; Jumps m_jumps; uint32_t m_indexOfTailOfLastWatchpoint; }; } // namespace JSC #endif // ENABLE(ASSEMBLER) && CPU(ARM_TRADITIONAL) #endif // ARMAssembler_h