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diff --git a/xpcom/reflect/xptcall/md/unix/xptcstubs_asm_mips64.S b/xpcom/reflect/xptcall/md/unix/xptcstubs_asm_mips64.S
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+++ b/xpcom/reflect/xptcall/md/unix/xptcstubs_asm_mips64.S
@@ -0,0 +1,111 @@
+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* 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 <sys/regdef.h>
+#include <sys/asm.h>
+
+LOCALSZ=16
+FRAMESZ=(((NARGSAVE+LOCALSZ)*SZREG)+ALSZ)&ALMASK
+
+A1OFF=FRAMESZ-(9*SZREG)
+A2OFF=FRAMESZ-(8*SZREG)
+A3OFF=FRAMESZ-(7*SZREG)
+A4OFF=FRAMESZ-(6*SZREG)
+A5OFF=FRAMESZ-(5*SZREG)
+A6OFF=FRAMESZ-(4*SZREG)
+A7OFF=FRAMESZ-(3*SZREG)
+GPOFF=FRAMESZ-(2*SZREG)
+RAOFF=FRAMESZ-(1*SZREG)
+
+F13OFF=FRAMESZ-(16*SZREG)
+F14OFF=FRAMESZ-(15*SZREG)
+F15OFF=FRAMESZ-(14*SZREG)
+F16OFF=FRAMESZ-(13*SZREG)
+F17OFF=FRAMESZ-(12*SZREG)
+F18OFF=FRAMESZ-(11*SZREG)
+F19OFF=FRAMESZ-(10*SZREG)
+
+#define SENTINEL_ENTRY(n) /* defined in cpp file, not here */
+
+#define STUB_ENTRY(x) \
+ .if x < 10; \
+ MAKE_STUB(x, _ZN14nsXPTCStubBase5Stub ##x ##Ev); \
+ .elseif x < 100; \
+ MAKE_STUB(x, _ZN14nsXPTCStubBase6Stub ##x ##Ev); \
+ .elseif x < 1000; \
+ MAKE_STUB(x, _ZN14nsXPTCStubBase7Stub ##x ##Ev); \
+ .else; \
+ .err; \
+ .endif
+
+#define MAKE_STUB(x, name) \
+ .globl name; \
+ .type name,@function; \
+ .aent name,0; \
+name:; \
+ PTR_SUBU sp,FRAMESZ; \
+ SETUP_GP64(GPOFF, name); \
+ li t0,x; \
+ b sharedstub; \
+
+#
+# open a dummy frame for the function entries
+#
+ .text
+ .align 2
+ .type dummy,@function
+ .ent dummy, 0
+dummy:
+ .frame sp, FRAMESZ, ra
+ .mask 0x90000FF0, RAOFF-FRAMESZ
+ .fmask 0x000FF000, F19OFF-FRAMESZ
+
+#include "xptcstubsdef.inc"
+
+sharedstub:
+
+ REG_S a1, A1OFF(sp)
+ REG_S a2, A2OFF(sp)
+ REG_S a3, A3OFF(sp)
+ REG_S a4, A4OFF(sp)
+ REG_S a5, A5OFF(sp)
+ REG_S a6, A6OFF(sp)
+ REG_S a7, A7OFF(sp)
+ REG_S ra, RAOFF(sp)
+
+ s.d $f13, F13OFF(sp)
+ s.d $f14, F14OFF(sp)
+ s.d $f15, F15OFF(sp)
+ s.d $f16, F16OFF(sp)
+ s.d $f17, F17OFF(sp)
+ s.d $f18, F18OFF(sp)
+ s.d $f19, F19OFF(sp)
+
+ # t0 is methodIndex
+ move a1, t0
+
+ # a2 is stack address where extra function params
+ # are stored that do not fit in registers
+ move a2, sp
+ PTR_ADDI a2, FRAMESZ
+
+ # a3 is stack address of a1..a7
+ move a3, sp
+ PTR_ADDI a3, A1OFF
+
+ # a4 is stack address of f13..f19
+ move a4, sp
+ PTR_ADDI a4, F13OFF
+
+ # PrepareAndDispatch(that, methodIndex, args, gprArgs, fpArgs)
+ # a0 a1 a2 a3 a4
+ #
+ jal PrepareAndDispatch
+
+ REG_L ra, RAOFF(sp)
+ RESTORE_GP64
+
+ PTR_ADDU sp, FRAMESZ
+ j ra
+ END(dummy)