| /* |
| * Copyright (C) 2009-2017 Apple Inc. All rights reserved. |
| * Copyright (C) 2009 University of Szeged |
| * All rights reserved. |
| * Copyright (C) 2010 MIPS Technologies, Inc. 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 MIPS TECHNOLOGIES, 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 MIPS TECHNOLOGIES, 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) && CPU(MIPS) |
| |
| #include "AssemblerBuffer.h" |
| #include "JITCompilationEffort.h" |
| #include <limits.h> |
| #include <wtf/Assertions.h> |
| #include <wtf/SegmentedVector.h> |
| |
| namespace JSC { |
| |
| typedef uint32_t MIPSWord; |
| |
| namespace MIPSRegisters { |
| typedef enum { |
| r0 = 0, |
| r1, |
| r2, |
| r3, |
| r4, |
| r5, |
| r6, |
| r7, |
| r8, |
| r9, |
| r10, |
| r11, |
| r12, |
| r13, |
| r14, |
| r15, |
| r16, |
| r17, |
| r18, |
| r19, |
| r20, |
| r21, |
| r22, |
| r23, |
| r24, |
| r25, |
| r26, |
| r27, |
| r28, |
| r29, |
| r30, |
| r31, |
| zero = r0, |
| at = r1, |
| v0 = r2, |
| v1 = r3, |
| a0 = r4, |
| a1 = r5, |
| a2 = r6, |
| a3 = r7, |
| t0 = r8, |
| t1 = r9, |
| t2 = r10, |
| t3 = r11, |
| t4 = r12, |
| t5 = r13, |
| t6 = r14, |
| t7 = r15, |
| s0 = r16, |
| s1 = r17, |
| s2 = r18, |
| s3 = r19, |
| s4 = r20, |
| s5 = r21, |
| s6 = r22, |
| s7 = r23, |
| t8 = r24, |
| t9 = r25, |
| k0 = r26, |
| k1 = r27, |
| gp = r28, |
| sp = r29, |
| fp = r30, |
| ra = r31 |
| } RegisterID; |
| |
| typedef enum { |
| f0, |
| f1, |
| f2, |
| f3, |
| f4, |
| f5, |
| f6, |
| f7, |
| f8, |
| f9, |
| f10, |
| f11, |
| f12, |
| f13, |
| f14, |
| f15, |
| f16, |
| f17, |
| f18, |
| f19, |
| f20, |
| f21, |
| f22, |
| f23, |
| f24, |
| f25, |
| f26, |
| f27, |
| f28, |
| f29, |
| f30, |
| f31 |
| } FPRegisterID; |
| |
| } // namespace MIPSRegisters |
| |
| class MIPSAssembler { |
| public: |
| typedef MIPSRegisters::RegisterID RegisterID; |
| typedef MIPSRegisters::FPRegisterID FPRegisterID; |
| typedef SegmentedVector<AssemblerLabel, 64> Jumps; |
| |
| static constexpr RegisterID firstRegister() { return MIPSRegisters::r0; } |
| static constexpr RegisterID lastRegister() { return MIPSRegisters::r31; } |
| |
| static constexpr FPRegisterID firstFPRegister() { return MIPSRegisters::f0; } |
| static constexpr FPRegisterID lastFPRegister() { return MIPSRegisters::f31; } |
| |
| MIPSAssembler() |
| : m_indexOfLastWatchpoint(INT_MIN) |
| , m_indexOfTailOfLastWatchpoint(INT_MIN) |
| { |
| } |
| |
| AssemblerBuffer& buffer() { return m_buffer; } |
| |
| // MIPS instruction opcode field position |
| enum { |
| OP_SH_RD = 11, |
| OP_SH_RT = 16, |
| OP_SH_RS = 21, |
| OP_SH_SHAMT = 6, |
| OP_SH_CODE = 16, |
| OP_SH_FD = 6, |
| OP_SH_FS = 11, |
| OP_SH_FT = 16 |
| }; |
| |
| void emitInst(MIPSWord op) |
| { |
| void* oldBase = m_buffer.data(); |
| |
| m_buffer.putInt(op); |
| |
| void* newBase = m_buffer.data(); |
| if (oldBase != newBase) |
| relocateJumps(oldBase, newBase); |
| } |
| |
| void nop() |
| { |
| emitInst(0x00000000); |
| } |
| |
| static void fillNops(void* base, size_t size, bool isCopyingToExecutableMemory) |
| { |
| UNUSED_PARAM(isCopyingToExecutableMemory); |
| RELEASE_ASSERT(!(size % sizeof(int32_t))); |
| |
| int32_t* ptr = static_cast<int32_t*>(base); |
| const size_t num32s = size / sizeof(int32_t); |
| const int32_t insn = 0x00000000; |
| for (size_t i = 0; i < num32s; i++) |
| *ptr++ = insn; |
| } |
| |
| void sync() |
| { |
| // FIXME: https://bugs.webkit.org/show_bug.cgi?id=169984 |
| // We might get a performance improvements by using SYNC_MB in some or |
| // all cases. |
| emitInst(0x0000000f); |
| } |
| |
| /* Need to insert one load data delay nop for mips1. */ |
| void loadDelayNop() |
| { |
| #if WTF_MIPS_ISA(1) |
| nop(); |
| #endif |
| } |
| |
| /* Need to insert one coprocessor access delay nop for mips1. */ |
| void copDelayNop() |
| { |
| #if WTF_MIPS_ISA(1) |
| nop(); |
| #endif |
| } |
| |
| void move(RegisterID rd, RegisterID rs) |
| { |
| /* addu */ |
| emitInst(0x00000021 | (rd << OP_SH_RD) | (rs << OP_SH_RS)); |
| } |
| |
| /* Set an immediate value to a register. This may generate 1 or 2 |
| instructions. */ |
| void li(RegisterID dest, int imm) |
| { |
| if (imm >= -32768 && imm <= 32767) |
| addiu(dest, MIPSRegisters::zero, imm); |
| else if (imm >= 0 && imm < 65536) |
| ori(dest, MIPSRegisters::zero, imm); |
| else { |
| lui(dest, imm >> 16); |
| if (imm & 0xffff) |
| ori(dest, dest, imm); |
| } |
| } |
| |
| void lui(RegisterID rt, int imm) |
| { |
| emitInst(0x3c000000 | (rt << OP_SH_RT) | (imm & 0xffff)); |
| } |
| |
| void clz(RegisterID rd, RegisterID rs) |
| { |
| emitInst(0x70000020 | (rd << OP_SH_RD) | (rs << OP_SH_RS) | (rd << OP_SH_RT)); |
| } |
| |
| void addiu(RegisterID rt, RegisterID rs, int imm) |
| { |
| emitInst(0x24000000 | (rt << OP_SH_RT) | (rs << OP_SH_RS) | (imm & 0xffff)); |
| } |
| |
| void addu(RegisterID rd, RegisterID rs, RegisterID rt) |
| { |
| emitInst(0x00000021 | (rd << OP_SH_RD) | (rs << OP_SH_RS) | (rt << OP_SH_RT)); |
| } |
| |
| void subu(RegisterID rd, RegisterID rs, RegisterID rt) |
| { |
| emitInst(0x00000023 | (rd << OP_SH_RD) | (rs << OP_SH_RS) | (rt << OP_SH_RT)); |
| } |
| |
| void mult(RegisterID rs, RegisterID rt) |
| { |
| emitInst(0x00000018 | (rs << OP_SH_RS) | (rt << OP_SH_RT)); |
| } |
| |
| void div(RegisterID rs, RegisterID rt) |
| { |
| emitInst(0x0000001a | (rs << OP_SH_RS) | (rt << OP_SH_RT)); |
| } |
| |
| void mfhi(RegisterID rd) |
| { |
| emitInst(0x00000010 | (rd << OP_SH_RD)); |
| } |
| |
| void mflo(RegisterID rd) |
| { |
| emitInst(0x00000012 | (rd << OP_SH_RD)); |
| } |
| |
| void mul(RegisterID rd, RegisterID rs, RegisterID rt) |
| { |
| #if WTF_MIPS_ISA_AT_LEAST(32) |
| emitInst(0x70000002 | (rd << OP_SH_RD) | (rs << OP_SH_RS) | (rt << OP_SH_RT)); |
| #else |
| mult(rs, rt); |
| mflo(rd); |
| #endif |
| } |
| |
| void andInsn(RegisterID rd, RegisterID rs, RegisterID rt) |
| { |
| emitInst(0x00000024 | (rd << OP_SH_RD) | (rs << OP_SH_RS) | (rt << OP_SH_RT)); |
| } |
| |
| void andi(RegisterID rt, RegisterID rs, int imm) |
| { |
| emitInst(0x30000000 | (rt << OP_SH_RT) | (rs << OP_SH_RS) | (imm & 0xffff)); |
| } |
| |
| void nor(RegisterID rd, RegisterID rs, RegisterID rt) |
| { |
| emitInst(0x00000027 | (rd << OP_SH_RD) | (rs << OP_SH_RS) | (rt << OP_SH_RT)); |
| } |
| |
| void orInsn(RegisterID rd, RegisterID rs, RegisterID rt) |
| { |
| emitInst(0x00000025 | (rd << OP_SH_RD) | (rs << OP_SH_RS) | (rt << OP_SH_RT)); |
| } |
| |
| void ori(RegisterID rt, RegisterID rs, int imm) |
| { |
| emitInst(0x34000000 | (rt << OP_SH_RT) | (rs << OP_SH_RS) | (imm & 0xffff)); |
| } |
| |
| void xorInsn(RegisterID rd, RegisterID rs, RegisterID rt) |
| { |
| emitInst(0x00000026 | (rd << OP_SH_RD) | (rs << OP_SH_RS) | (rt << OP_SH_RT)); |
| } |
| |
| void xori(RegisterID rt, RegisterID rs, int imm) |
| { |
| emitInst(0x38000000 | (rt << OP_SH_RT) | (rs << OP_SH_RS) | (imm & 0xffff)); |
| } |
| |
| void slt(RegisterID rd, RegisterID rs, RegisterID rt) |
| { |
| emitInst(0x0000002a | (rd << OP_SH_RD) | (rs << OP_SH_RS) | (rt << OP_SH_RT)); |
| } |
| |
| void sltu(RegisterID rd, RegisterID rs, RegisterID rt) |
| { |
| emitInst(0x0000002b | (rd << OP_SH_RD) | (rs << OP_SH_RS) | (rt << OP_SH_RT)); |
| } |
| |
| void sltiu(RegisterID rt, RegisterID rs, int imm) |
| { |
| emitInst(0x2c000000 | (rt << OP_SH_RT) | (rs << OP_SH_RS) | (imm & 0xffff)); |
| } |
| |
| void sll(RegisterID rd, RegisterID rt, int shamt) |
| { |
| emitInst(0x00000000 | (rd << OP_SH_RD) | (rt << OP_SH_RT) | ((shamt & 0x1f) << OP_SH_SHAMT)); |
| } |
| |
| void sllv(RegisterID rd, RegisterID rt, RegisterID rs) |
| { |
| emitInst(0x00000004 | (rd << OP_SH_RD) | (rt << OP_SH_RT) | (rs << OP_SH_RS)); |
| } |
| |
| void sra(RegisterID rd, RegisterID rt, int shamt) |
| { |
| emitInst(0x00000003 | (rd << OP_SH_RD) | (rt << OP_SH_RT) | ((shamt & 0x1f) << OP_SH_SHAMT)); |
| } |
| |
| void srav(RegisterID rd, RegisterID rt, RegisterID rs) |
| { |
| emitInst(0x00000007 | (rd << OP_SH_RD) | (rt << OP_SH_RT) | (rs << OP_SH_RS)); |
| } |
| |
| void srl(RegisterID rd, RegisterID rt, int shamt) |
| { |
| emitInst(0x00000002 | (rd << OP_SH_RD) | (rt << OP_SH_RT) | ((shamt & 0x1f) << OP_SH_SHAMT)); |
| } |
| |
| void srlv(RegisterID rd, RegisterID rt, RegisterID rs) |
| { |
| emitInst(0x00000006 | (rd << OP_SH_RD) | (rt << OP_SH_RT) | (rs << OP_SH_RS)); |
| } |
| |
| void lb(RegisterID rt, RegisterID rs, int offset) |
| { |
| emitInst(0x80000000 | (rt << OP_SH_RT) | (rs << OP_SH_RS) | (offset & 0xffff)); |
| loadDelayNop(); |
| } |
| |
| void lbu(RegisterID rt, RegisterID rs, int offset) |
| { |
| emitInst(0x90000000 | (rt << OP_SH_RT) | (rs << OP_SH_RS) | (offset & 0xffff)); |
| loadDelayNop(); |
| } |
| |
| void lw(RegisterID rt, RegisterID rs, int offset) |
| { |
| emitInst(0x8c000000 | (rt << OP_SH_RT) | (rs << OP_SH_RS) | (offset & 0xffff)); |
| loadDelayNop(); |
| } |
| |
| void lwl(RegisterID rt, RegisterID rs, int offset) |
| { |
| emitInst(0x88000000 | (rt << OP_SH_RT) | (rs << OP_SH_RS) | (offset & 0xffff)); |
| loadDelayNop(); |
| } |
| |
| void lwr(RegisterID rt, RegisterID rs, int offset) |
| { |
| emitInst(0x98000000 | (rt << OP_SH_RT) | (rs << OP_SH_RS) | (offset & 0xffff)); |
| loadDelayNop(); |
| } |
| |
| void lh(RegisterID rt, RegisterID rs, int offset) |
| { |
| emitInst(0x84000000 | (rt << OP_SH_RT) | (rs << OP_SH_RS) | (offset & 0xffff)); |
| loadDelayNop(); |
| } |
| |
| void lhu(RegisterID rt, RegisterID rs, int offset) |
| { |
| emitInst(0x94000000 | (rt << OP_SH_RT) | (rs << OP_SH_RS) | (offset & 0xffff)); |
| loadDelayNop(); |
| } |
| |
| void sb(RegisterID rt, RegisterID rs, int offset) |
| { |
| emitInst(0xa0000000 | (rt << OP_SH_RT) | (rs << OP_SH_RS) | (offset & 0xffff)); |
| } |
| |
| void sh(RegisterID rt, RegisterID rs, int offset) |
| { |
| emitInst(0xa4000000 | (rt << OP_SH_RT) | (rs << OP_SH_RS) | (offset & 0xffff)); |
| } |
| |
| void sw(RegisterID rt, RegisterID rs, int offset) |
| { |
| emitInst(0xac000000 | (rt << OP_SH_RT) | (rs << OP_SH_RS) | (offset & 0xffff)); |
| } |
| |
| void jr(RegisterID rs) |
| { |
| emitInst(0x00000008 | (rs << OP_SH_RS)); |
| } |
| |
| void jalr(RegisterID rs) |
| { |
| emitInst(0x0000f809 | (rs << OP_SH_RS)); |
| } |
| |
| void jal() |
| { |
| emitInst(0x0c000000); |
| } |
| |
| void bkpt() |
| { |
| int value = 512; /* BRK_BUG */ |
| emitInst(0x0000000d | ((value & 0x3ff) << OP_SH_CODE)); |
| } |
| |
| static bool isBkpt(void* address) |
| { |
| int value = 512; /* BRK_BUG */ |
| MIPSWord expected = (0x0000000d | ((value & 0x3ff) << OP_SH_CODE)); |
| MIPSWord candidateInstruction = *reinterpret_cast<MIPSWord*>(address); |
| return candidateInstruction == expected; |
| } |
| |
| void bgez(RegisterID rs, int imm) |
| { |
| emitInst(0x04010000 | (rs << OP_SH_RS) | (imm & 0xffff)); |
| } |
| |
| void bltz(RegisterID rs, int imm) |
| { |
| emitInst(0x04000000 | (rs << OP_SH_RS) | (imm & 0xffff)); |
| } |
| |
| void beq(RegisterID rs, RegisterID rt, int imm) |
| { |
| emitInst(0x10000000 | (rs << OP_SH_RS) | (rt << OP_SH_RT) | (imm & 0xffff)); |
| } |
| |
| void bne(RegisterID rs, RegisterID rt, int imm) |
| { |
| emitInst(0x14000000 | (rs << OP_SH_RS) | (rt << OP_SH_RT) | (imm & 0xffff)); |
| } |
| |
| void bc1t() |
| { |
| emitInst(0x45010000); |
| } |
| |
| void bc1f() |
| { |
| emitInst(0x45000000); |
| } |
| |
| void appendJump() |
| { |
| m_jumps.append(m_buffer.label()); |
| } |
| |
| void addd(FPRegisterID fd, FPRegisterID fs, FPRegisterID ft) |
| { |
| emitInst(0x46200000 | (fd << OP_SH_FD) | (fs << OP_SH_FS) | (ft << OP_SH_FT)); |
| } |
| |
| void subd(FPRegisterID fd, FPRegisterID fs, FPRegisterID ft) |
| { |
| emitInst(0x46200001 | (fd << OP_SH_FD) | (fs << OP_SH_FS) | (ft << OP_SH_FT)); |
| } |
| |
| void muld(FPRegisterID fd, FPRegisterID fs, FPRegisterID ft) |
| { |
| emitInst(0x46200002 | (fd << OP_SH_FD) | (fs << OP_SH_FS) | (ft << OP_SH_FT)); |
| } |
| |
| void divd(FPRegisterID fd, FPRegisterID fs, FPRegisterID ft) |
| { |
| emitInst(0x46200003 | (fd << OP_SH_FD) | (fs << OP_SH_FS) | (ft << OP_SH_FT)); |
| } |
| |
| void lwc1(FPRegisterID ft, RegisterID rs, int offset) |
| { |
| emitInst(0xc4000000 | (ft << OP_SH_FT) | (rs << OP_SH_RS) | (offset & 0xffff)); |
| copDelayNop(); |
| } |
| |
| void ldc1(FPRegisterID ft, RegisterID rs, int offset) |
| { |
| emitInst(0xd4000000 | (ft << OP_SH_FT) | (rs << OP_SH_RS) | (offset & 0xffff)); |
| } |
| |
| void swc1(FPRegisterID ft, RegisterID rs, int offset) |
| { |
| emitInst(0xe4000000 | (ft << OP_SH_FT) | (rs << OP_SH_RS) | (offset & 0xffff)); |
| } |
| |
| void sdc1(FPRegisterID ft, RegisterID rs, int offset) |
| { |
| emitInst(0xf4000000 | (ft << OP_SH_FT) | (rs << OP_SH_RS) | (offset & 0xffff)); |
| } |
| |
| void mtc1(RegisterID rt, FPRegisterID fs) |
| { |
| emitInst(0x44800000 | (fs << OP_SH_FS) | (rt << OP_SH_RT)); |
| copDelayNop(); |
| } |
| |
| void mthc1(RegisterID rt, FPRegisterID fs) |
| { |
| emitInst(0x44e00000 | (fs << OP_SH_FS) | (rt << OP_SH_RT)); |
| copDelayNop(); |
| } |
| |
| void mfc1(RegisterID rt, FPRegisterID fs) |
| { |
| emitInst(0x44000000 | (fs << OP_SH_FS) | (rt << OP_SH_RT)); |
| copDelayNop(); |
| } |
| |
| void sqrtd(FPRegisterID fd, FPRegisterID fs) |
| { |
| emitInst(0x46200004 | (fd << OP_SH_FD) | (fs << OP_SH_FS)); |
| } |
| |
| void absd(FPRegisterID fd, FPRegisterID fs) |
| { |
| emitInst(0x46200005 | (fd << OP_SH_FD) | (fs << OP_SH_FS)); |
| } |
| |
| void movd(FPRegisterID fd, FPRegisterID fs) |
| { |
| emitInst(0x46200006 | (fd << OP_SH_FD) | (fs << OP_SH_FS)); |
| } |
| |
| void negd(FPRegisterID fd, FPRegisterID fs) |
| { |
| emitInst(0x46200007 | (fd << OP_SH_FD) | (fs << OP_SH_FS)); |
| } |
| |
| void truncwd(FPRegisterID fd, FPRegisterID fs) |
| { |
| emitInst(0x4620000d | (fd << OP_SH_FD) | (fs << OP_SH_FS)); |
| } |
| |
| void cvtdw(FPRegisterID fd, FPRegisterID fs) |
| { |
| emitInst(0x46800021 | (fd << OP_SH_FD) | (fs << OP_SH_FS)); |
| } |
| |
| void cvtds(FPRegisterID fd, FPRegisterID fs) |
| { |
| emitInst(0x46000021 | (fd << OP_SH_FD) | (fs << OP_SH_FS)); |
| } |
| |
| void cvtwd(FPRegisterID fd, FPRegisterID fs) |
| { |
| emitInst(0x46200024 | (fd << OP_SH_FD) | (fs << OP_SH_FS)); |
| } |
| |
| void cvtsd(FPRegisterID fd, FPRegisterID fs) |
| { |
| emitInst(0x46200020 | (fd << OP_SH_FD) | (fs << OP_SH_FS)); |
| } |
| |
| void ceqd(FPRegisterID fs, FPRegisterID ft) |
| { |
| emitInst(0x46200032 | (fs << OP_SH_FS) | (ft << OP_SH_FT)); |
| copDelayNop(); |
| } |
| |
| void cngtd(FPRegisterID fs, FPRegisterID ft) |
| { |
| emitInst(0x4620003f | (fs << OP_SH_FS) | (ft << OP_SH_FT)); |
| copDelayNop(); |
| } |
| |
| void cnged(FPRegisterID fs, FPRegisterID ft) |
| { |
| emitInst(0x4620003d | (fs << OP_SH_FS) | (ft << OP_SH_FT)); |
| copDelayNop(); |
| } |
| |
| void cltd(FPRegisterID fs, FPRegisterID ft) |
| { |
| emitInst(0x4620003c | (fs << OP_SH_FS) | (ft << OP_SH_FT)); |
| copDelayNop(); |
| } |
| |
| void cled(FPRegisterID fs, FPRegisterID ft) |
| { |
| emitInst(0x4620003e | (fs << OP_SH_FS) | (ft << OP_SH_FT)); |
| copDelayNop(); |
| } |
| |
| void cueqd(FPRegisterID fs, FPRegisterID ft) |
| { |
| emitInst(0x46200033 | (fs << OP_SH_FS) | (ft << OP_SH_FT)); |
| copDelayNop(); |
| } |
| |
| void coled(FPRegisterID fs, FPRegisterID ft) |
| { |
| emitInst(0x46200036 | (fs << OP_SH_FS) | (ft << OP_SH_FT)); |
| copDelayNop(); |
| } |
| |
| void coltd(FPRegisterID fs, FPRegisterID ft) |
| { |
| emitInst(0x46200034 | (fs << OP_SH_FS) | (ft << OP_SH_FT)); |
| copDelayNop(); |
| } |
| |
| void culed(FPRegisterID fs, FPRegisterID ft) |
| { |
| emitInst(0x46200037 | (fs << OP_SH_FS) | (ft << OP_SH_FT)); |
| copDelayNop(); |
| } |
| |
| void cultd(FPRegisterID fs, FPRegisterID ft) |
| { |
| emitInst(0x46200035 | (fs << OP_SH_FS) | (ft << OP_SH_FT)); |
| copDelayNop(); |
| } |
| |
| // General helpers |
| |
| AssemblerLabel labelIgnoringWatchpoints() |
| { |
| return m_buffer.label(); |
| } |
| |
| AssemblerLabel labelForWatchpoint() |
| { |
| AssemblerLabel result = m_buffer.label(); |
| if (static_cast<int>(result.m_offset) != m_indexOfLastWatchpoint) |
| result = label(); |
| m_indexOfLastWatchpoint = result.m_offset; |
| m_indexOfTailOfLastWatchpoint = result.m_offset + maxJumpReplacementSize(); |
| return result; |
| } |
| |
| AssemblerLabel label() |
| { |
| AssemblerLabel result = m_buffer.label(); |
| while (UNLIKELY(static_cast<int>(result.m_offset) < m_indexOfTailOfLastWatchpoint)) { |
| nop(); |
| result = m_buffer.label(); |
| } |
| return result; |
| } |
| |
| AssemblerLabel align(int alignment) |
| { |
| while (!m_buffer.isAligned(alignment)) |
| bkpt(); |
| |
| return label(); |
| } |
| |
| static void* getRelocatedAddress(void* code, AssemblerLabel label) |
| { |
| return reinterpret_cast<void*>(reinterpret_cast<char*>(code) + label.m_offset); |
| } |
| |
| static int getDifferenceBetweenLabels(AssemblerLabel a, AssemblerLabel b) |
| { |
| return b.m_offset - a.m_offset; |
| } |
| |
| // Assembler admin methods: |
| |
| size_t codeSize() const |
| { |
| return m_buffer.codeSize(); |
| } |
| |
| unsigned debugOffset() { return m_buffer.debugOffset(); } |
| |
| // Assembly helpers for moving data between fp and registers. |
| void vmov(RegisterID rd1, RegisterID rd2, FPRegisterID rn) |
| { |
| #if WTF_MIPS_ISA_REV(2) && WTF_MIPS_FP64 |
| mfc1(rd1, rn); |
| mfhc1(rd2, rn); |
| #else |
| mfc1(rd1, rn); |
| mfc1(rd2, FPRegisterID(rn + 1)); |
| #endif |
| } |
| |
| void vmov(FPRegisterID rd, RegisterID rn1, RegisterID rn2) |
| { |
| #if WTF_MIPS_ISA_REV(2) && WTF_MIPS_FP64 |
| mtc1(rn1, rd); |
| mthc1(rn2, rd); |
| #else |
| mtc1(rn1, rd); |
| mtc1(rn2, FPRegisterID(rd + 1)); |
| #endif |
| } |
| |
| static unsigned getCallReturnOffset(AssemblerLabel call) |
| { |
| // The return address is after a call and a delay slot instruction |
| return call.m_offset; |
| } |
| |
| // Linking & patching: |
| // |
| // 'link' and 'patch' methods are for use on unprotected code - such as the code |
| // within the AssemblerBuffer, and code being patched by the patch buffer. Once |
| // code has been finalized it is (platform support permitting) within a non- |
| // writable region of memory; to modify the code in an execute-only execuable |
| // pool the 'repatch' and 'relink' methods should be used. |
| |
| static size_t linkDirectJump(void* code, void* to) |
| { |
| MIPSWord* insn = reinterpret_cast<MIPSWord*>(reinterpret_cast<intptr_t>(code)); |
| size_t ops = 0; |
| int32_t slotAddr = reinterpret_cast<int>(insn) + 4; |
| int32_t toAddr = reinterpret_cast<int>(to); |
| |
| if ((slotAddr & 0xf0000000) != (toAddr & 0xf0000000)) { |
| // lui |
| *insn = 0x3c000000 | (MIPSRegisters::t9 << OP_SH_RT) | ((toAddr >> 16) & 0xffff); |
| ++insn; |
| // ori |
| *insn = 0x34000000 | (MIPSRegisters::t9 << OP_SH_RT) | (MIPSRegisters::t9 << OP_SH_RS) | (toAddr & 0xffff); |
| ++insn; |
| // jr |
| *insn = 0x00000008 | (MIPSRegisters::t9 << OP_SH_RS); |
| ++insn; |
| ops = 4 * sizeof(MIPSWord); |
| } else { |
| // j |
| *insn = 0x08000000 | ((toAddr & 0x0fffffff) >> 2); |
| ++insn; |
| ops = 2 * sizeof(MIPSWord); |
| } |
| // nop |
| *insn = 0x00000000; |
| return ops; |
| } |
| |
| void linkJump(AssemblerLabel from, AssemblerLabel to) |
| { |
| ASSERT(to.isSet()); |
| ASSERT(from.isSet()); |
| MIPSWord* insn = reinterpret_cast<MIPSWord*>(reinterpret_cast<intptr_t>(m_buffer.data()) + from.m_offset); |
| MIPSWord* toPos = reinterpret_cast<MIPSWord*>(reinterpret_cast<intptr_t>(m_buffer.data()) + to.m_offset); |
| |
| ASSERT(!(*(insn - 1)) && !(*(insn - 2)) && !(*(insn - 3)) && !(*(insn - 5))); |
| insn = insn - 6; |
| linkWithOffset(insn, toPos); |
| } |
| |
| static void linkJump(void* code, AssemblerLabel from, void* to) |
| { |
| ASSERT(from.isSet()); |
| MIPSWord* insn = reinterpret_cast<MIPSWord*>(reinterpret_cast<intptr_t>(code) + from.m_offset); |
| |
| ASSERT(!(*(insn - 1)) && !(*(insn - 2)) && !(*(insn - 3)) && !(*(insn - 5))); |
| insn = insn - 6; |
| linkWithOffset(insn, to); |
| } |
| |
| static void linkCall(void* code, AssemblerLabel from, void* to) |
| { |
| MIPSWord* insn = reinterpret_cast<MIPSWord*>(reinterpret_cast<intptr_t>(code) + from.m_offset); |
| linkCallInternal(insn, to); |
| } |
| |
| static void linkPointer(void* code, AssemblerLabel from, void* to) |
| { |
| MIPSWord* insn = reinterpret_cast<MIPSWord*>(reinterpret_cast<intptr_t>(code) + from.m_offset); |
| ASSERT((*insn & 0xffe00000) == 0x3c000000); // lui |
| *insn = (*insn & 0xffff0000) | ((reinterpret_cast<intptr_t>(to) >> 16) & 0xffff); |
| insn++; |
| ASSERT((*insn & 0xfc000000) == 0x34000000); // ori |
| *insn = (*insn & 0xffff0000) | (reinterpret_cast<intptr_t>(to) & 0xffff); |
| } |
| |
| static void relinkJump(void* from, void* to) |
| { |
| MIPSWord* insn = reinterpret_cast<MIPSWord*>(from); |
| |
| ASSERT(!(*(insn - 1)) && !(*(insn - 5))); |
| insn = insn - 6; |
| int flushSize = linkWithOffset(insn, to); |
| |
| cacheFlush(insn, flushSize); |
| } |
| |
| static void relinkJumpToNop(void* from) |
| { |
| relinkJump(from, from); |
| } |
| |
| static void relinkCall(void* from, void* to) |
| { |
| void* start; |
| int size = linkCallInternal(from, to); |
| if (size == sizeof(MIPSWord)) |
| start = reinterpret_cast<void*>(reinterpret_cast<intptr_t>(from) - 2 * sizeof(MIPSWord)); |
| else |
| start = reinterpret_cast<void*>(reinterpret_cast<intptr_t>(from) - 4 * sizeof(MIPSWord)); |
| |
| cacheFlush(start, size); |
| } |
| |
| static void repatchInt32(void* from, int32_t to) |
| { |
| MIPSWord* insn = reinterpret_cast<MIPSWord*>(from); |
| ASSERT((*insn & 0xffe00000) == 0x3c000000); // lui |
| *insn = (*insn & 0xffff0000) | ((to >> 16) & 0xffff); |
| insn++; |
| ASSERT((*insn & 0xfc000000) == 0x34000000); // ori |
| *insn = (*insn & 0xffff0000) | (to & 0xffff); |
| insn--; |
| cacheFlush(insn, 2 * sizeof(MIPSWord)); |
| } |
| |
| static int32_t readInt32(void* from) |
| { |
| MIPSWord* insn = reinterpret_cast<MIPSWord*>(from); |
| ASSERT((*insn & 0xffe00000) == 0x3c000000); // lui |
| int32_t result = (*insn & 0x0000ffff) << 16; |
| insn++; |
| ASSERT((*insn & 0xfc000000) == 0x34000000); // ori |
| result |= *insn & 0x0000ffff; |
| return result; |
| } |
| |
| static void repatchCompact(void* where, int32_t value) |
| { |
| repatchInt32(where, value); |
| } |
| |
| static void repatchPointer(void* from, void* to) |
| { |
| repatchInt32(from, reinterpret_cast<int32_t>(to)); |
| } |
| |
| static void* readPointer(void* from) |
| { |
| return reinterpret_cast<void*>(readInt32(from)); |
| } |
| |
| static void* readCallTarget(void* from) |
| { |
| MIPSWord* insn = reinterpret_cast<MIPSWord*>(from); |
| insn -= 4; |
| ASSERT((*insn & 0xffe00000) == 0x3c000000); // lui |
| int32_t result = (*insn & 0x0000ffff) << 16; |
| insn++; |
| ASSERT((*insn & 0xfc000000) == 0x34000000); // ori |
| result |= *insn & 0x0000ffff; |
| return reinterpret_cast<void*>(result); |
| } |
| |
| static void cacheFlush(void* code, size_t size) |
| { |
| intptr_t end = reinterpret_cast<intptr_t>(code) + size; |
| __builtin___clear_cache(reinterpret_cast<char*>(code), reinterpret_cast<char*>(end)); |
| } |
| |
| static ptrdiff_t maxJumpReplacementSize() |
| { |
| return sizeof(MIPSWord) * 4; |
| } |
| |
| static constexpr ptrdiff_t patchableJumpSize() |
| { |
| return sizeof(MIPSWord) * 8; |
| } |
| |
| static void revertJumpToMove(void* instructionStart, RegisterID rt, int imm) |
| { |
| MIPSWord* insn = static_cast<MIPSWord*>(instructionStart); |
| size_t codeSize = 2 * sizeof(MIPSWord); |
| |
| // lui |
| *insn = 0x3c000000 | (rt << OP_SH_RT) | ((imm >> 16) & 0xffff); |
| ++insn; |
| // ori |
| *insn = 0x34000000 | (rt << OP_SH_RS) | (rt << OP_SH_RT) | (imm & 0xffff); |
| ++insn; |
| // if jr $t9 |
| if (*insn == 0x03200008) { |
| *insn = 0x00000000; |
| codeSize += sizeof(MIPSWord); |
| } |
| cacheFlush(insn, codeSize); |
| } |
| |
| static void replaceWithJump(void* instructionStart, void* to) |
| { |
| ASSERT(!(bitwise_cast<uintptr_t>(instructionStart) & 3)); |
| ASSERT(!(bitwise_cast<uintptr_t>(to) & 3)); |
| size_t ops = linkDirectJump(instructionStart, to); |
| cacheFlush(instructionStart, ops); |
| } |
| |
| static void replaceWithLoad(void* instructionStart) |
| { |
| MIPSWord* insn = reinterpret_cast<MIPSWord*>(instructionStart); |
| ASSERT((*insn & 0xffe00000) == 0x3c000000); // lui |
| insn++; |
| ASSERT((*insn & 0xfc0007ff) == 0x00000021); // addu |
| insn++; |
| *insn = 0x8c000000 | ((*insn) & 0x3ffffff); // lw |
| cacheFlush(insn, 4); |
| } |
| |
| static void replaceWithAddressComputation(void* instructionStart) |
| { |
| MIPSWord* insn = reinterpret_cast<MIPSWord*>(instructionStart); |
| ASSERT((*insn & 0xffe00000) == 0x3c000000); // lui |
| insn++; |
| ASSERT((*insn & 0xfc0007ff) == 0x00000021); // addu |
| insn++; |
| *insn = 0x24000000 | ((*insn) & 0x3ffffff); // addiu |
| cacheFlush(insn, 4); |
| } |
| |
| /* Update each jump in the buffer of newBase. */ |
| void relocateJumps(void* oldBase, void* newBase) |
| { |
| // Check each jump |
| for (Jumps::Iterator iter = m_jumps.begin(); iter != m_jumps.end(); ++iter) { |
| int pos = iter->m_offset; |
| MIPSWord* insn = reinterpret_cast<MIPSWord*>(reinterpret_cast<intptr_t>(newBase) + pos); |
| insn = insn + 2; |
| // Need to make sure we have 5 valid instructions after pos |
| if ((unsigned)pos >= m_buffer.codeSize() - 5 * sizeof(MIPSWord)) |
| continue; |
| |
| if ((*insn & 0xfc000000) == 0x08000000) { // j |
| int offset = *insn & 0x03ffffff; |
| int oldInsnAddress = (int)insn - (int)newBase + (int)oldBase; |
| int topFourBits = (oldInsnAddress + 4) >> 28; |
| int oldTargetAddress = (topFourBits << 28) | (offset << 2); |
| int newTargetAddress = oldTargetAddress - (int)oldBase + (int)newBase; |
| int newInsnAddress = (int)insn; |
| if (((newInsnAddress + 4) >> 28) == (newTargetAddress >> 28)) |
| *insn = 0x08000000 | ((newTargetAddress >> 2) & 0x3ffffff); |
| else { |
| /* lui */ |
| *insn = 0x3c000000 | (MIPSRegisters::t9 << OP_SH_RT) | ((newTargetAddress >> 16) & 0xffff); |
| /* ori */ |
| *(insn + 1) = 0x34000000 | (MIPSRegisters::t9 << OP_SH_RT) | (MIPSRegisters::t9 << OP_SH_RS) | (newTargetAddress & 0xffff); |
| /* jr */ |
| *(insn + 2) = 0x00000008 | (MIPSRegisters::t9 << OP_SH_RS); |
| } |
| } else if ((*insn & 0xffe00000) == 0x3c000000) { // lui |
| int high = (*insn & 0xffff) << 16; |
| int low = *(insn + 1) & 0xffff; |
| int oldTargetAddress = high | low; |
| int newTargetAddress = oldTargetAddress - (int)oldBase + (int)newBase; |
| /* lui */ |
| *insn = 0x3c000000 | (MIPSRegisters::t9 << OP_SH_RT) | ((newTargetAddress >> 16) & 0xffff); |
| /* ori */ |
| *(insn + 1) = 0x34000000 | (MIPSRegisters::t9 << OP_SH_RT) | (MIPSRegisters::t9 << OP_SH_RS) | (newTargetAddress & 0xffff); |
| } |
| } |
| } |
| |
| private: |
| static int linkWithOffset(MIPSWord* insn, void* to) |
| { |
| ASSERT((*insn & 0xfc000000) == 0x10000000 // beq |
| || (*insn & 0xfc000000) == 0x14000000 // bne |
| || (*insn & 0xffff0000) == 0x45010000 // bc1t |
| || (*insn & 0xffff0000) == 0x45000000); // bc1f |
| intptr_t diff = (reinterpret_cast<intptr_t>(to) - reinterpret_cast<intptr_t>(insn) - 4) >> 2; |
| |
| if (diff < -32768 || diff > 32767 || *(insn + 2) != 0x10000003) { |
| /* |
| Convert the sequence: |
| beq $2, $3, target |
| nop |
| b 1f |
| nop |
| nop |
| nop |
| 1: |
| |
| to the new sequence if possible: |
| bne $2, $3, 1f |
| nop |
| j target |
| nop |
| nop |
| nop |
| 1: |
| |
| OR to the new sequence: |
| bne $2, $3, 1f |
| nop |
| lui $25, target >> 16 |
| ori $25, $25, target & 0xffff |
| jr $25 |
| nop |
| 1: |
| |
| Note: beq/bne/bc1t/bc1f are converted to bne/beq/bc1f/bc1t. |
| */ |
| |
| if (*(insn + 2) == 0x10000003) { |
| if ((*insn & 0xfc000000) == 0x10000000) // beq |
| *insn = (*insn & 0x03ff0000) | 0x14000005; // bne |
| else if ((*insn & 0xfc000000) == 0x14000000) // bne |
| *insn = (*insn & 0x03ff0000) | 0x10000005; // beq |
| else if ((*insn & 0xffff0000) == 0x45010000) // bc1t |
| *insn = 0x45000005; // bc1f |
| else if ((*insn & 0xffff0000) == 0x45000000) // bc1f |
| *insn = 0x45010005; // bc1t |
| else |
| ASSERT(0); |
| } |
| |
| insn = insn + 2; |
| if ((reinterpret_cast<intptr_t>(insn) + 4) >> 28 |
| == reinterpret_cast<intptr_t>(to) >> 28) { |
| *insn = 0x08000000 | ((reinterpret_cast<intptr_t>(to) >> 2) & 0x3ffffff); |
| *(insn + 1) = 0; |
| return 4 * sizeof(MIPSWord); |
| } |
| |
| intptr_t newTargetAddress = reinterpret_cast<intptr_t>(to); |
| /* lui */ |
| *insn = 0x3c000000 | (MIPSRegisters::t9 << OP_SH_RT) | ((newTargetAddress >> 16) & 0xffff); |
| /* ori */ |
| *(insn + 1) = 0x34000000 | (MIPSRegisters::t9 << OP_SH_RT) | (MIPSRegisters::t9 << OP_SH_RS) | (newTargetAddress & 0xffff); |
| /* jr */ |
| *(insn + 2) = 0x00000008 | (MIPSRegisters::t9 << OP_SH_RS); |
| return 5 * sizeof(MIPSWord); |
| } |
| |
| *insn = (*insn & 0xffff0000) | (diff & 0xffff); |
| return sizeof(MIPSWord); |
| } |
| |
| static int linkCallInternal(void* from, void* to) |
| { |
| MIPSWord* insn = reinterpret_cast<MIPSWord*>(from); |
| insn = insn - 4; |
| |
| if ((*(insn + 2) & 0xfc000000) == 0x0c000000) { // jal |
| if ((reinterpret_cast<intptr_t>(from) - 4) >> 28 |
| == reinterpret_cast<intptr_t>(to) >> 28) { |
| *(insn + 2) = 0x0c000000 | ((reinterpret_cast<intptr_t>(to) >> 2) & 0x3ffffff); |
| return sizeof(MIPSWord); |
| } |
| |
| /* lui $25, (to >> 16) & 0xffff */ |
| *insn = 0x3c000000 | (MIPSRegisters::t9 << OP_SH_RT) | ((reinterpret_cast<intptr_t>(to) >> 16) & 0xffff); |
| /* ori $25, $25, to & 0xffff */ |
| *(insn + 1) = 0x34000000 | (MIPSRegisters::t9 << OP_SH_RT) | (MIPSRegisters::t9 << OP_SH_RS) | (reinterpret_cast<intptr_t>(to) & 0xffff); |
| /* jalr $25 */ |
| *(insn + 2) = 0x0000f809 | (MIPSRegisters::t9 << OP_SH_RS); |
| return 3 * sizeof(MIPSWord); |
| } |
| |
| ASSERT((*insn & 0xffe00000) == 0x3c000000); // lui |
| ASSERT((*(insn + 1) & 0xfc000000) == 0x34000000); // ori |
| |
| /* lui */ |
| *insn = (*insn & 0xffff0000) | ((reinterpret_cast<intptr_t>(to) >> 16) & 0xffff); |
| /* ori */ |
| *(insn + 1) = (*(insn + 1) & 0xffff0000) | (reinterpret_cast<intptr_t>(to) & 0xffff); |
| return 2 * sizeof(MIPSWord); |
| } |
| |
| AssemblerBuffer m_buffer; |
| Jumps m_jumps; |
| int m_indexOfLastWatchpoint; |
| int m_indexOfTailOfLastWatchpoint; |
| }; |
| |
| } // namespace JSC |
| |
| #endif // ENABLE(ASSEMBLER) && CPU(MIPS) |
