Merge pull request #1544 from FlyGoat/mips-upstream

Implements initial MIPS Support

1 files changed, 4 insertions, 182 deletions

diff --git a/js/src/jit/mips64/Assembler-mips64.cpp b/js/src/jit/mips64/Assembler-mips64.cpp
index 4d251f152..4f3eac094 100644
--- a/js/src/jit/mips64/Assembler-mips64.cpp
+++ b/js/src/jit/mips64/Assembler-mips64.cpp
@@ -87,7 +87,9 @@ js::jit::SA(FloatRegister r)
 void
 jit::PatchJump(CodeLocationJump& jump_, CodeLocationLabel label, ReprotectCode reprotect)
 {
-    Instruction* inst = (Instruction*)jump_.raw();
+    Instruction* inst;
+
+    inst = AssemblerMIPSShared::GetInstructionImmediateFromJump((Instruction*)jump_.raw());
 
     // Six instructions used in load 64-bit imm.
     MaybeAutoWritableJitCode awjc(inst, 6 * sizeof(uint32_t), reprotect);
@@ -125,23 +127,6 @@ jit::PatchBackedge(CodeLocationJump& jump, CodeLocationLabel label,
     }
 }
 
-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* inst = (Instruction*) ((uintptr_t)buffer + longJumps_[i]);
-
-        uint64_t value = Assembler::ExtractLoad64Value(inst);
-        Assembler::UpdateLoad64Value(inst, (uint64_t)buffer + value);
-    }
-
-    AutoFlushICache::setRange(uintptr_t(buffer), m_buffer.size());
-}
-
 uintptr_t
 Assembler::GetPointer(uint8_t* instPtr)
 {
@@ -243,155 +228,6 @@ Assembler::Bind(uint8_t* rawCode, CodeOffset* label, const void* address)
     }
 }
 
-void
-Assembler::bind(InstImm* inst, uintptr_t branch, uintptr_t target)
-{
-    int64_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::WriteLoad64Instructions(inst, ScratchRegister, target);
-        inst[4] = InstReg(op_special, ScratchRegister, zero, ra, ff_jalr).encode();
-        // There is 1 nop after this.
-        return;
-    }
-
-    if (BOffImm16::IsInRange(offset)) {
-        // Don't skip trailing nops can improve performance
-        // on Loongson3 platform.
-        bool skipNops = !isLoongson() && (inst[0].encode() != inst_bgezal.encode() &&
-                                          inst[0].encode() != inst_beq.encode());
-
-        inst[0].setBOffImm16(BOffImm16(offset));
-        inst[1].makeNop();
-
-        if (skipNops) {
-            inst[2] = InstImm(op_regimm, zero, rt_bgez, BOffImm16(5 * sizeof(uint32_t))).encode();
-            // There are 4 nops after this
-        }
-        return;
-    }
-
-    if (inst[0].encode() == inst_beq.encode()) {
-        // Handle long unconditional jump.
-        addLongJump(BufferOffset(branch));
-        Assembler::WriteLoad64Instructions(inst, ScratchRegister, target);
-        inst[4] = 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(7 * sizeof(uint32_t)));
-        // No need for a "nop" here because we can clobber scratch.
-        addLongJump(BufferOffset(branch + sizeof(uint32_t)));
-        Assembler::WriteLoad64Instructions(&inst[1], ScratchRegister, target);
-        inst[5] = 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));
-        uint64_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::UpdateLoad64Value(inst, 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 MacroAssemblerMIPS64::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);
-            MOZ_ASSERT(inst[5].encode() == NopInst);
-            addLongJump(BufferOffset(label->offset()));
-            Assembler::WriteLoad64Instructions(inst, ScratchRegister, dest.getOffset());
-            inst[4] = 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(7 * sizeof(uint32_t)));
-            // No need for a "nop" here because we can clobber scratch.
-            // We need to add it to long jumps array here.
-            // See MacroAssemblerMIPS64::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);
-            MOZ_ASSERT(inst[5].encode() == NopInst);
-            MOZ_ASSERT(inst[6].encode() == NopInst);
-            addLongJump(BufferOffset(label->offset() + sizeof(uint32_t)));
-            Assembler::WriteLoad64Instructions(&inst[1], ScratchRegister, dest.getOffset());
-            inst[5] = InstReg(op_special, ScratchRegister, zero, zero, ff_jr).encode();
-        }
-    }
-    label->bind(dest.getOffset());
-}
-
-uint32_t
-Assembler::PatchWrite_NearCallSize()
-{
-    // Load an address needs 4 instructions, and a jump with a delay slot.
-    return (4 + 2) * 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::WriteLoad64Instructions(inst, ScratchRegister, (uint64_t)dest);
-    inst[4] = InstReg(op_special, ScratchRegister, zero, ra, ff_jalr);
-    inst[5] = InstNOP();
-
-    // Ensure everyone sees the code that was just written into memory.
-    AutoFlushICache::flush(uintptr_t(inst), PatchWrite_NearCallSize());
-}
-
 uint64_t
 Assembler::ExtractLoad64Value(Instruction* inst0)
 {
@@ -453,19 +289,6 @@ Assembler::UpdateLoad64Value(Instruction* inst0, uint64_t value)
 }
 
 void
-Assembler::WriteLoad64Instructions(Instruction* inst0, Register reg, uint64_t value)
-{
-    Instruction* inst1 = inst0->next();
-    Instruction* inst2 = inst1->next();
-    Instruction* inst3 = inst2->next();
-
-    *inst0 = InstImm(op_lui, zero, reg, Imm16::Lower(Imm32(value >> 32)));
-    *inst1 = InstImm(op_ori, reg, reg, Imm16::Upper(Imm32(value)));
-    *inst2 = InstReg(op_special, rs_one, reg, reg, 48 - 32, ff_dsrl32);
-    *inst3 = InstImm(op_ori, reg, reg, Imm16::Lower(Imm32(value)));
-}
-
-void
 Assembler::PatchDataWithValueCheck(CodeLocationLabel label, ImmPtr newValue,
                                    ImmPtr expectedValue)
 {
@@ -492,8 +315,7 @@ Assembler::PatchDataWithValueCheck(CodeLocationLabel label, PatchedImmPtr newVal
 void
 Assembler::PatchInstructionImmediate(uint8_t* code, PatchedImmPtr imm)
 {
-    InstImm* inst = (InstImm*)code;
-    Assembler::UpdateLoad64Value(inst, (uint64_t)imm.value);
+    Assembler::UpdateLoad64Value((Instruction*)code, (uint64_t)imm.value);
 }
 
 uint64_t