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diff --git a/rts/gmp/mpn/sh/sh2/submul_1.s b/rts/gmp/mpn/sh/sh2/submul_1.s
new file mode 100644
index 0000000..eb9a27d
--- /dev/null
+++ b/rts/gmp/mpn/sh/sh2/submul_1.s
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+! SH2 __gmpn_submul_1 -- Multiply a limb vector with a limb and subtract
+! the result from a second limb vector.
+
+! Copyright (C) 1995, 2000 Free Software Foundation, Inc.
+
+! This file is part of the GNU MP Library.
+
+! The GNU MP Library is free software; you can redistribute it and/or modify
+! it under the terms of the GNU Lesser General Public License as published by
+! the Free Software Foundation; either version 2.1 of the License, or (at your
+! option) any later version.
+
+! The GNU MP Library is distributed in the hope that it will be useful, but
+! WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+! or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
+! License for more details.
+
+! You should have received a copy of the GNU Lesser General Public License
+! along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
+! the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+! MA 02111-1307, USA.
+
+
+! INPUT PARAMETERS
+! res_ptr	r4
+! s1_ptr	r5
+! size		r6
+! s2_limb	r7
+
+	.text
+	.align 1
+	.global	___gmpn_submul_1
+___gmpn_submul_1:
+	mov	#0,r2		! cy_limb = 0
+	mov	#0,r0		! Keep r0 = 0 for entire loop
+	clrt
+
+Loop:	mov.l	@r5+,r3
+	dmulu.l	r3,r7
+	sts	macl,r1
+	addc	r2,r1		! lo_prod += old cy_limb
+	sts	mach,r2		! new cy_limb = hi_prod
+	mov.l	@r4,r3
+	addc	r0,r2		! cy_limb += T, T = 0
+	subc	r3,r1
+	addc	r0,r2		! cy_limb += T, T = 0
+	dt	r6
+	mov.l	r1,@r4
+	bf.s	Loop
+	add	#4,r4
+
+	rts
+	mov	r2,r0