diff -r 000000000000 -r 6474c204b198 js/src/jit/mips/BaselineRegisters-mips.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit/mips/BaselineRegisters-mips.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,49 @@
+/* -*- 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/. */
+
+#ifndef jit_mips_BaselineRegisters_mips_h
+#define jit_mips_BaselineRegisters_mips_h
+
+#ifdef JS_ION
+
+#include "jit/IonMacroAssembler.h"
+
+namespace js {
+namespace jit {
+
+static MOZ_CONSTEXPR_VAR Register BaselineFrameReg = s5;
+static MOZ_CONSTEXPR_VAR Register BaselineStackReg = sp;
+
+static MOZ_CONSTEXPR_VAR ValueOperand R0(v1, v0);
+static MOZ_CONSTEXPR_VAR ValueOperand R1(s7, s6);
+static MOZ_CONSTEXPR_VAR ValueOperand R2(t7, t6);
+
+// BaselineTailCallReg and BaselineStubReg
+// These use registers that are not preserved across calls.
+static MOZ_CONSTEXPR_VAR Register BaselineTailCallReg = ra;
+static MOZ_CONSTEXPR_VAR Register BaselineStubReg = t5;
+
+static MOZ_CONSTEXPR_VAR Register ExtractTemp0 = InvalidReg;
+static MOZ_CONSTEXPR_VAR Register ExtractTemp1 = InvalidReg;
+
+// Register used internally by MacroAssemblerMIPS.
+static MOZ_CONSTEXPR_VAR Register BaselineSecondScratchReg = SecondScratchReg;
+
+// Note that BaselineTailCallReg is actually just the link register.
+// In MIPS code emission, we do not clobber BaselineTailCallReg since we keep
+// the return address for calls there.
+
+// FloatReg0 must be equal to ReturnFloatReg.
+static MOZ_CONSTEXPR_VAR FloatRegister FloatReg0 = f0;
+static MOZ_CONSTEXPR_VAR FloatRegister FloatReg1 = f2;
+
+} // namespace jit
+} // namespace js
+
+#endif // JS_ION
+
+#endif /* jit_mips_BaselineRegisters_mips_h */
+