1 files changed, 81 insertions, 0 deletions
diff --git a/js/src/jit/mips-shared/Assembler-mips-shared.cpp b/js/src/jit/mips-shared/Assembler-mips-shared.cpp
index 8519bab4d..1b14ef0eb 100644
--- a/js/src/jit/mips-shared/Assembler-mips-shared.cpp
+++ b/js/src/jit/mips-shared/Assembler-mips-shared.cpp
@@ -1597,6 +1597,87 @@ AssemblerMIPSShared::bindLater(Label* label, wasm::TrapDesc target)
 }
 
 void
+AssemblerMIPSShared::bind(InstImm* inst, uintptr_t branch, uintptr_t target)
+{
+    intptr_t offset = target - branch;
+
+    // Generate the patchable mixed jump for call.
+    if (inst->extractOpcode() == ((uint32_t)op_jal >> OpcodeShift)) {
+        addMixedJump(BufferOffset(branch), ImmPtr((void*)target));
+        return;
+    }
+
+    // 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;
+    }
+
+    if (BOffImm16::IsInRange(offset)) {
+        inst[0].setBOffImm16(BOffImm16(offset));
+        inst[1].makeNop();
+        return;
+    }
+
+    addMixedJump(BufferOffset(branch), ImmPtr((void*)target));
+}
+
+void
+AssemblerMIPSShared::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));
+        intptr_t offset = dest.getOffset() - label->offset();
+
+        // If first instruction is j, then this is a mixed jump.
+        // If second instruction is lui, then this is a loop backedge.
+        if (inst[0].extractOpcode() == (uint32_t(op_j) >> OpcodeShift)) {
+            // For unconditional mixed branches generated by jumpWithPatch
+            addMixedJump(b, ImmPtr((void*)dest.getOffset()), MixedJumpPatch::PATCHABLE);
+        } else if (inst[1].extractOpcode() == (uint32_t(op_lui) >> OpcodeShift) ||
+                   BOffImm16::IsInRange(offset))
+        {
+            // Handle code produced by:
+            //     backedgeJump
+            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 mixed unconditional jumps created by
+            // MacroAssemblerMIPSShared::ma_b(..., wasm::Trap, ...).
+            // We need to add it to mixed jumps array here.
+            // See MacroAssemblerMIPS::branchWithCode().
+            MOZ_ASSERT(inst[1].encode() == NopInst);
+            addMixedJump(b, ImmPtr((void*)dest.getOffset()), MixedJumpPatch::PATCHABLE);
+            inst[0] = InstJump(op_j, JOffImm26(0)).encode();
+        } else {
+            // Handle open mixed conditional jumps created by
+            // MacroAssemblerMIPSShared::ma_b(..., wasm::Trap, ...).
+            inst[0] = invertBranch(inst[0], BOffImm16(4 * sizeof(uint32_t)));
+            // No need for a "nop" here because we can clobber scratch.
+            // We need to add it to mixed jumps array here.
+            // See MacroAssemblerMIPS::branchWithCode().
+            MOZ_ASSERT(inst[1].encode() == NopInst);
+            MOZ_ASSERT(inst[2].encode() == NopInst);
+            MOZ_ASSERT(inst[3].encode() == NopInst);
+            addMixedJump(b, ImmPtr((void*)dest.getOffset()), MixedJumpPatch::PATCHABLE);
+            inst[2] = InstJump(op_j, JOffImm26(0)).encode();
+        }
+    }
+    label->bind(dest.getOffset());
+}
+
+void
 AssemblerMIPSShared::retarget(Label* label, Label* target)
 {
     if (label->used() && !oom()) {