Add m-esr52 at 52.6.0

1 files changed, 545 insertions, 0 deletions

diff --git a/js/src/jit/mips32/Assembler-mips32.cpp b/js/src/jit/mips32/Assembler-mips32.cpp
new file mode 100644
index 000000000..6283c1d5a
--- /dev/null
+++ b/js/src/jit/mips32/Assembler-mips32.cpp
@@ -0,0 +1,545 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ * vim: set ts=8 sts=4 et sw=4 tw=99:
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "jit/mips32/Assembler-mips32.h"
+
+#include "mozilla/DebugOnly.h"
+
+using mozilla::DebugOnly;
+
+using namespace js;
+using namespace js::jit;
+
+ABIArgGenerator::ABIArgGenerator()
+  : usedArgSlots_(0),
+    firstArgFloatSize_(0),
+    useGPRForFloats_(false),
+    current_()
+{}
+
+ABIArg
+ABIArgGenerator::next(MIRType type)
+{
+    Register destReg;
+    switch (type) {
+      case MIRType::Int32:
+      case MIRType::Pointer:
+        if (GetIntArgReg(usedArgSlots_, &destReg))
+            current_ = ABIArg(destReg);
+        else
+            current_ = ABIArg(usedArgSlots_ * sizeof(intptr_t));
+        usedArgSlots_++;
+        break;
+      case MIRType::Int64:
+        if (!usedArgSlots_) {
+            current_ = ABIArg(a0, a1);
+            usedArgSlots_ = 2;
+        } else if (usedArgSlots_ <= 2) {
+            current_ = ABIArg(a2, a3);
+            usedArgSlots_ = 4;
+        } else {
+            if (usedArgSlots_ < NumIntArgRegs)
+                usedArgSlots_ = NumIntArgRegs;
+            usedArgSlots_ += usedArgSlots_ % 2;
+            current_ = ABIArg(usedArgSlots_ * sizeof(intptr_t));
+            usedArgSlots_ += 2;
+        }
+        break;
+      case MIRType::Float32:
+        if (!usedArgSlots_) {
+            current_ = ABIArg(f12.asSingle());
+            firstArgFloatSize_ = 1;
+        } else if (usedArgSlots_ == firstArgFloatSize_) {
+            current_ = ABIArg(f14.asSingle());
+        } else if (useGPRForFloats_ && GetIntArgReg(usedArgSlots_, &destReg)) {
+            current_ = ABIArg(destReg);
+        } else {
+            if (usedArgSlots_ < NumIntArgRegs)
+                usedArgSlots_ = NumIntArgRegs;
+            current_ = ABIArg(usedArgSlots_ * sizeof(intptr_t));
+        }
+        usedArgSlots_++;
+        break;
+      case MIRType::Double:
+        if (!usedArgSlots_) {
+            current_ = ABIArg(f12);
+            usedArgSlots_ = 2;
+            firstArgFloatSize_ = 2;
+        } else if (usedArgSlots_ == firstArgFloatSize_) {
+            current_ = ABIArg(f14);
+            usedArgSlots_ = 4;
+        } else if (useGPRForFloats_ && usedArgSlots_ <= 2) {
+            current_ = ABIArg(a2, a3);
+            usedArgSlots_ = 4;
+        } else {
+            if (usedArgSlots_ < NumIntArgRegs)
+                usedArgSlots_ = NumIntArgRegs;
+            usedArgSlots_ += usedArgSlots_ % 2;
+            current_ = ABIArg(usedArgSlots_ * sizeof(intptr_t));
+            usedArgSlots_ += 2;
+        }
+        break;
+      default:
+        MOZ_CRASH("Unexpected argument type");
+    }
+    return current_;
+}
+
+uint32_t
+js::jit::RT(FloatRegister r)
+{
+    MOZ_ASSERT(r.id() < FloatRegisters::RegisterIdLimit);
+    return r.id() << RTShift;
+}
+
+uint32_t
+js::jit::RD(FloatRegister r)
+{
+    MOZ_ASSERT(r.id() < FloatRegisters::RegisterIdLimit);
+    return r.id() << RDShift;
+}
+
+uint32_t
+js::jit::RZ(FloatRegister r)
+{
+    MOZ_ASSERT(r.id() < FloatRegisters::RegisterIdLimit);
+    return r.id() << RZShift;
+}
+
+uint32_t
+js::jit::SA(FloatRegister r)
+{
+    MOZ_ASSERT(r.id() < FloatRegisters::RegisterIdLimit);
+    return r.id() << SAShift;
+}
+
+// Used to patch jumps created by MacroAssemblerMIPSCompat::jumpWithPatch.
+void
+jit::PatchJump(CodeLocationJump& jump_, CodeLocationLabel label, ReprotectCode reprotect)
+{
+    Instruction* inst1 = (Instruction*)jump_.raw();
+    Instruction* inst2 = inst1->next();
+
+    MaybeAutoWritableJitCode awjc(inst1, 8, reprotect);
+    Assembler::UpdateLuiOriValue(inst1, inst2, (uint32_t)label.raw());
+
+    AutoFlushICache::flush(uintptr_t(inst1), 8);
+}
+
+// For more infromation about backedges look at comment in
+// MacroAssemblerMIPSCompat::backedgeJump()
+void
+jit::PatchBackedge(CodeLocationJump& jump, CodeLocationLabel label,
+                   JitRuntime::BackedgeTarget target)
+{
+    uint32_t sourceAddr = (uint32_t)jump.raw();
+    uint32_t targetAddr = (uint32_t)label.raw();
+    InstImm* branch = (InstImm*)jump.raw();
+
+    MOZ_ASSERT(branch->extractOpcode() == (uint32_t(op_beq) >> OpcodeShift));
+
+    if (BOffImm16::IsInRange(targetAddr - sourceAddr)) {
+        branch->setBOffImm16(BOffImm16(targetAddr - sourceAddr));
+    } else {
+        if (target == JitRuntime::BackedgeLoopHeader) {
+            Instruction* lui = &branch[1];
+            Assembler::UpdateLuiOriValue(lui, lui->next(), targetAddr);
+            // Jump to ori. The lui will be executed in delay slot.
+            branch->setBOffImm16(BOffImm16(2 * sizeof(uint32_t)));
+        } else {
+            Instruction* lui = &branch[4];
+            Assembler::UpdateLuiOriValue(lui, lui->next(), targetAddr);
+            branch->setBOffImm16(BOffImm16(4 * sizeof(uint32_t)));
+        }
+    }
+}
+
+void
+Assembler::executableCopy(uint8_t* buffer)
+{
+    MOZ_ASSERT(isFinished);
+    m_buffer.executableCopy(buffer);
+
+    // Patch all long jumps during code copy.
+    for (size_t i = 0; i < longJumps_.length(); i++) {
+        Instruction* inst1 = (Instruction*) ((uint32_t)buffer + longJumps_[i]);
+
+        uint32_t value = Assembler::ExtractLuiOriValue(inst1, inst1->next());
+        Assembler::UpdateLuiOriValue(inst1, inst1->next(), (uint32_t)buffer + value);
+    }
+
+    AutoFlushICache::setRange(uintptr_t(buffer), m_buffer.size());
+}
+
+uintptr_t
+Assembler::GetPointer(uint8_t* instPtr)
+{
+    Instruction* inst = (Instruction*)instPtr;
+    return Assembler::ExtractLuiOriValue(inst, inst->next());
+}
+
+static JitCode*
+CodeFromJump(Instruction* jump)
+{
+    uint8_t* target = (uint8_t*)Assembler::ExtractLuiOriValue(jump, jump->next());
+    return JitCode::FromExecutable(target);
+}
+
+void
+Assembler::TraceJumpRelocations(JSTracer* trc, JitCode* code, CompactBufferReader& reader)
+{
+    while (reader.more()) {
+        JitCode* child = CodeFromJump((Instruction*)(code->raw() + reader.readUnsigned()));
+        TraceManuallyBarrieredEdge(trc, &child, "rel32");
+    }
+}
+
+static void
+TraceOneDataRelocation(JSTracer* trc, Instruction* inst)
+{
+    void* ptr = (void*)Assembler::ExtractLuiOriValue(inst, inst->next());
+    void* prior = ptr;
+
+    // No barrier needed since these are constants.
+    TraceManuallyBarrieredGenericPointerEdge(trc, reinterpret_cast<gc::Cell**>(&ptr),
+                                                 "ion-masm-ptr");
+    if (ptr != prior) {
+        Assembler::UpdateLuiOriValue(inst, inst->next(), uint32_t(ptr));
+        AutoFlushICache::flush(uintptr_t(inst), 8);
+    }
+}
+
+static void
+TraceDataRelocations(JSTracer* trc, uint8_t* buffer, CompactBufferReader& reader)
+{
+    while (reader.more()) {
+        size_t offset = reader.readUnsigned();
+        Instruction* inst = (Instruction*)(buffer + offset);
+        TraceOneDataRelocation(trc, inst);
+    }
+}
+
+static void
+TraceDataRelocations(JSTracer* trc, MIPSBuffer* buffer, CompactBufferReader& reader)
+{
+    while (reader.more()) {
+        BufferOffset bo (reader.readUnsigned());
+        MIPSBuffer::AssemblerBufferInstIterator iter(bo, buffer);
+        TraceOneDataRelocation(trc, iter.cur());
+    }
+}
+
+void
+Assembler::TraceDataRelocations(JSTracer* trc, JitCode* code, CompactBufferReader& reader)
+{
+    ::TraceDataRelocations(trc, code->raw(), reader);
+}
+
+Assembler::Condition
+Assembler::UnsignedCondition(Condition cond)
+{
+    switch (cond) {
+      case Zero:
+      case NonZero:
+        return cond;
+      case LessThan:
+      case Below:
+        return Below;
+      case LessThanOrEqual:
+      case BelowOrEqual:
+        return BelowOrEqual;
+      case GreaterThan:
+      case Above:
+        return Above;
+      case AboveOrEqual:
+      case GreaterThanOrEqual:
+        return AboveOrEqual;
+      default:
+        MOZ_CRASH("unexpected condition");
+    }
+}
+
+Assembler::Condition
+Assembler::ConditionWithoutEqual(Condition cond)
+{
+    switch (cond) {
+      case LessThan:
+      case LessThanOrEqual:
+        return LessThan;
+      case Below:
+      case BelowOrEqual:
+        return Below;
+      case GreaterThan:
+      case GreaterThanOrEqual:
+        return GreaterThan;
+      case Above:
+      case AboveOrEqual:
+        return Above;
+      default:
+        MOZ_CRASH("unexpected condition");
+    }
+}
+
+void
+Assembler::trace(JSTracer* trc)
+{
+    for (size_t i = 0; i < jumps_.length(); i++) {
+        RelativePatch& rp = jumps_[i];
+        if (rp.kind == Relocation::JITCODE) {
+            JitCode* code = JitCode::FromExecutable((uint8_t*)rp.target);
+            TraceManuallyBarrieredEdge(trc, &code, "masmrel32");
+            MOZ_ASSERT(code == JitCode::FromExecutable((uint8_t*)rp.target));
+        }
+    }
+    if (dataRelocations_.length()) {
+        CompactBufferReader reader(dataRelocations_);
+        ::TraceDataRelocations(trc, &m_buffer, reader);
+    }
+}
+
+void
+Assembler::Bind(uint8_t* rawCode, CodeOffset* label, const void* address)
+{
+    if (label->bound()) {
+        intptr_t offset = label->offset();
+        Instruction* inst = (Instruction*) (rawCode + offset);
+        Assembler::UpdateLuiOriValue(inst, inst->next(), (uint32_t)address);
+    }
+}
+
+void
+Assembler::bind(InstImm* inst, uintptr_t branch, uintptr_t target)
+{
+    int32_t offset = target - branch;
+    InstImm inst_bgezal = InstImm(op_regimm, zero, rt_bgezal, BOffImm16(0));
+    InstImm inst_beq = InstImm(op_beq, zero, zero, BOffImm16(0));
+
+    // If encoded offset is 4, then the jump must be short
+    if (BOffImm16(inst[0]).decode() == 4) {
+        MOZ_ASSERT(BOffImm16::IsInRange(offset));
+        inst[0].setBOffImm16(BOffImm16(offset));
+        inst[1].makeNop();
+        return;
+    }
+
+    // Generate the long jump for calls because return address has to be the
+    // address after the reserved block.
+    if (inst[0].encode() == inst_bgezal.encode()) {
+        addLongJump(BufferOffset(branch));
+        Assembler::WriteLuiOriInstructions(inst, &inst[1], ScratchRegister, target);
+        inst[2] = InstReg(op_special, ScratchRegister, zero, ra, ff_jalr).encode();
+        // There is 1 nop after this.
+        return;
+    }
+
+    if (BOffImm16::IsInRange(offset)) {
+        bool conditional = (inst[0].encode() != inst_bgezal.encode() &&
+                            inst[0].encode() != inst_beq.encode());
+
+        inst[0].setBOffImm16(BOffImm16(offset));
+        inst[1].makeNop();
+
+        // Skip the trailing nops in conditional branches.
+        if (conditional) {
+            inst[2] = InstImm(op_regimm, zero, rt_bgez, BOffImm16(3 * sizeof(void*))).encode();
+            // There are 2 nops after this
+        }
+        return;
+    }
+
+    if (inst[0].encode() == inst_beq.encode()) {
+        // Handle long unconditional jump.
+        addLongJump(BufferOffset(branch));
+        Assembler::WriteLuiOriInstructions(inst, &inst[1], ScratchRegister, target);
+        inst[2] = InstReg(op_special, ScratchRegister, zero, zero, ff_jr).encode();
+        // There is 1 nop after this.
+    } else {
+        // Handle long conditional jump.
+        inst[0] = invertBranch(inst[0], BOffImm16(5 * sizeof(void*)));
+        // No need for a "nop" here because we can clobber scratch.
+        addLongJump(BufferOffset(branch + sizeof(void*)));
+        Assembler::WriteLuiOriInstructions(&inst[1], &inst[2], ScratchRegister, target);
+        inst[3] = InstReg(op_special, ScratchRegister, zero, zero, ff_jr).encode();
+        // There is 1 nop after this.
+    }
+}
+
+void
+Assembler::bind(RepatchLabel* label)
+{
+    BufferOffset dest = nextOffset();
+    if (label->used() && !oom()) {
+        // If the label has a use, then change this use to refer to
+        // the bound label;
+        BufferOffset b(label->offset());
+        InstImm* inst = (InstImm*)editSrc(b);
+        InstImm inst_beq = InstImm(op_beq, zero, zero, BOffImm16(0));
+        uint32_t offset = dest.getOffset() - label->offset();
+
+        // If first instruction is lui, then this is a long jump.
+        // If second instruction is lui, then this is a loop backedge.
+        if (inst[0].extractOpcode() == (uint32_t(op_lui) >> OpcodeShift)) {
+            // For unconditional long branches generated by ma_liPatchable,
+            // such as under:
+            //     jumpWithpatch
+            Assembler::UpdateLuiOriValue(inst, inst->next(), dest.getOffset());
+        } else if (inst[1].extractOpcode() == (uint32_t(op_lui) >> OpcodeShift) ||
+                   BOffImm16::IsInRange(offset))
+        {
+            // Handle code produced by:
+            //     backedgeJump
+            //     branchWithCode
+            MOZ_ASSERT(BOffImm16::IsInRange(offset));
+            MOZ_ASSERT(inst[0].extractOpcode() == (uint32_t(op_beq) >> OpcodeShift) ||
+                       inst[0].extractOpcode() == (uint32_t(op_bne) >> OpcodeShift) ||
+                       inst[0].extractOpcode() == (uint32_t(op_blez) >> OpcodeShift) ||
+                       inst[0].extractOpcode() == (uint32_t(op_bgtz) >> OpcodeShift));
+            inst[0].setBOffImm16(BOffImm16(offset));
+        } else if (inst[0].encode() == inst_beq.encode()) {
+            // Handle open long unconditional jumps created by
+            // MacroAssemblerMIPSShared::ma_b(..., wasm::Trap, ...).
+            // We need to add it to long jumps array here.
+            // See MacroAssemblerMIPS::branchWithCode().
+            MOZ_ASSERT(inst[1].encode() == NopInst);
+            MOZ_ASSERT(inst[2].encode() == NopInst);
+            MOZ_ASSERT(inst[3].encode() == NopInst);
+            addLongJump(BufferOffset(label->offset()));
+            Assembler::WriteLuiOriInstructions(inst, &inst[1], ScratchRegister, dest.getOffset());
+            inst[2] = InstReg(op_special, ScratchRegister, zero, zero, ff_jr).encode();
+        } else {
+            // Handle open long conditional jumps created by
+            // MacroAssemblerMIPSShared::ma_b(..., wasm::Trap, ...).
+            inst[0] = invertBranch(inst[0], BOffImm16(5 * sizeof(void*)));
+            // No need for a "nop" here because we can clobber scratch.
+            // We need to add it to long jumps array here.
+            // See MacroAssemblerMIPS::branchWithCode().
+            MOZ_ASSERT(inst[1].encode() == NopInst);
+            MOZ_ASSERT(inst[2].encode() == NopInst);
+            MOZ_ASSERT(inst[3].encode() == NopInst);
+            MOZ_ASSERT(inst[4].encode() == NopInst);
+            addLongJump(BufferOffset(label->offset() + sizeof(void*)));
+            Assembler::WriteLuiOriInstructions(&inst[1], &inst[2], ScratchRegister, dest.getOffset());
+            inst[3] = InstReg(op_special, ScratchRegister, zero, zero, ff_jr).encode();
+        }
+    }
+    label->bind(dest.getOffset());
+}
+
+uint32_t
+Assembler::PatchWrite_NearCallSize()
+{
+    return 4 * sizeof(uint32_t);
+}
+
+void
+Assembler::PatchWrite_NearCall(CodeLocationLabel start, CodeLocationLabel toCall)
+{
+    Instruction* inst = (Instruction*) start.raw();
+    uint8_t* dest = toCall.raw();
+
+    // Overwrite whatever instruction used to be here with a call.
+    // Always use long jump for two reasons:
+    // - Jump has to be the same size because of PatchWrite_NearCallSize.
+    // - Return address has to be at the end of replaced block.
+    // Short jump wouldn't be more efficient.
+    Assembler::WriteLuiOriInstructions(inst, &inst[1], ScratchRegister, (uint32_t)dest);
+    inst[2] = InstReg(op_special, ScratchRegister, zero, ra, ff_jalr);
+    inst[3] = InstNOP();
+
+    // Ensure everyone sees the code that was just written into memory.
+    AutoFlushICache::flush(uintptr_t(inst), PatchWrite_NearCallSize());
+}
+
+uint32_t
+Assembler::ExtractLuiOriValue(Instruction* inst0, Instruction* inst1)
+{
+    InstImm* i0 = (InstImm*) inst0;
+    InstImm* i1 = (InstImm*) inst1;
+    MOZ_ASSERT(i0->extractOpcode() == ((uint32_t)op_lui >> OpcodeShift));
+    MOZ_ASSERT(i1->extractOpcode() == ((uint32_t)op_ori >> OpcodeShift));
+
+    uint32_t value = i0->extractImm16Value() << 16;
+    value = value | i1->extractImm16Value();
+    return value;
+}
+
+void
+Assembler::UpdateLuiOriValue(Instruction* inst0, Instruction* inst1, uint32_t value)
+{
+    MOZ_ASSERT(inst0->extractOpcode() == ((uint32_t)op_lui >> OpcodeShift));
+    MOZ_ASSERT(inst1->extractOpcode() == ((uint32_t)op_ori >> OpcodeShift));
+
+    ((InstImm*) inst0)->setImm16(Imm16::Upper(Imm32(value)));
+    ((InstImm*) inst1)->setImm16(Imm16::Lower(Imm32(value)));
+}
+
+void
+Assembler::WriteLuiOriInstructions(Instruction* inst0, Instruction* inst1,
+                                   Register reg, uint32_t value)
+{
+    *inst0 = InstImm(op_lui, zero, reg, Imm16::Upper(Imm32(value)));
+    *inst1 = InstImm(op_ori, reg, reg, Imm16::Lower(Imm32(value)));
+}
+
+void
+Assembler::PatchDataWithValueCheck(CodeLocationLabel label, ImmPtr newValue,
+                                   ImmPtr expectedValue)
+{
+    PatchDataWithValueCheck(label, PatchedImmPtr(newValue.value),
+                            PatchedImmPtr(expectedValue.value));
+}
+
+void
+Assembler::PatchDataWithValueCheck(CodeLocationLabel label, PatchedImmPtr newValue,
+                                   PatchedImmPtr expectedValue)
+{
+    Instruction* inst = (Instruction*) label.raw();
+
+    // Extract old Value
+    DebugOnly<uint32_t> value = Assembler::ExtractLuiOriValue(&inst[0], &inst[1]);
+    MOZ_ASSERT(value == uint32_t(expectedValue.value));
+
+    // Replace with new value
+    Assembler::UpdateLuiOriValue(inst, inst->next(), uint32_t(newValue.value));
+
+    AutoFlushICache::flush(uintptr_t(inst), 8);
+}
+
+void
+Assembler::PatchInstructionImmediate(uint8_t* code, PatchedImmPtr imm)
+{
+    InstImm* inst = (InstImm*)code;
+    Assembler::UpdateLuiOriValue(inst, inst->next(), (uint32_t)imm.value);
+}
+
+uint32_t
+Assembler::ExtractInstructionImmediate(uint8_t* code)
+{
+    InstImm* inst = (InstImm*)code;
+    return Assembler::ExtractLuiOriValue(inst, inst->next());
+}
+
+void
+Assembler::ToggleCall(CodeLocationLabel inst_, bool enabled)
+{
+    Instruction* inst = (Instruction*)inst_.raw();
+    InstImm* i0 = (InstImm*) inst;
+    InstImm* i1 = (InstImm*) i0->next();
+    Instruction* i2 = (Instruction*) i1->next();
+
+    MOZ_ASSERT(i0->extractOpcode() == ((uint32_t)op_lui >> OpcodeShift));
+    MOZ_ASSERT(i1->extractOpcode() == ((uint32_t)op_ori >> OpcodeShift));
+
+    if (enabled) {
+        InstReg jalr = InstReg(op_special, ScratchRegister, zero, ra, ff_jalr);
+        *i2 = jalr;
+    } else {
+        InstNOP nop;
+        *i2 = nop;
+    }
+
+    AutoFlushICache::flush(uintptr_t(i2), 4);
+}