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diff --git a/gmp/mpn/s390/mul_1.asm b/gmp/mpn/s390/mul_1.asm
new file mode 100644
index 00000000..649671b4
--- /dev/null
+++ b/gmp/mpn/s390/mul_1.asm
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+dnl  S/390 mpn_mul_1 -- Multiply a limb vector with a limb and store the
+dnl  result in a second limb vector.
+
+dnl  Copyright 2001 Free Software Foundation, Inc.
+
+dnl  This file is part of the GNU MP Library.
+
+dnl  The GNU MP Library is free software; you can redistribute it and/or modify
+dnl  it under the terms of the GNU Lesser General Public License as published
+dnl  by the Free Software Foundation; either version 3 of the License, or (at
+dnl  your option) any later version.
+
+dnl  The GNU MP Library is distributed in the hope that it will be useful, but
+dnl  WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+dnl  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
+dnl  License for more details.
+
+dnl  You should have received a copy of the GNU Lesser General Public License
+dnl  along with the GNU MP Library.  If not, see http://www.gnu.org/licenses/.
+
+include(`../config.m4')
+
+define(`rp',2)
+define(`up',3)
+define(`n',4)
+define(`vlimb',5)
+define(`cylimb',7)
+
+ASM_START()
+PROLOGUE(mpn_mul_1)
+	stm	6,7,24(15)
+	slr	cylimb,cylimb	# clear cylimb
+	ltr	vlimb,vlimb
+	jnl	.Loopp
+
+.Loopn:	l	1,0(up)		# load from u
+	lr	6,1		#
+	mr	0,vlimb		# multiply signed
+	alr	0,6		# add vlimb to phi
+	sra	6,31		# make mask
+	nr	6,vlimb		# 0 or vlimb
+	alr	0,6		# conditionally add vlimb to phi
+	alr	1,cylimb	# add carry limb to plo
+	brc	8+4,+8		# branch if not carry
+	ahi	0,1		# increment phi
+	lr	cylimb,0	# new cylimb
+	st	1,0(rp)		# store
+	la	up,4(,up)
+	la	rp,4(,rp)
+	brct	n,.Loopn
+
+	lr	2,cylimb
+	lm	6,7,24(15)
+	br	14
+
+.Loopp:	l	1,0(up)		# load from u
+	lr	6,1		#
+	mr	0,vlimb		# multiply signed
+	sra	6,31		# make mask
+	nr	6,vlimb		# 0 or vlimb
+	alr	0,6		# conditionally add vlimb to phi
+	alr	1,cylimb	# add carry limb to plo
+	brc	8+4,+8		# branch if not carry
+	ahi	0,1		# increment phi
+	lr	cylimb,0	# new cylimb
+	st	1,0(rp)		# store
+	la	up,4(,up)
+	la	rp,4(,rp)
+	brct	n,.Loopp
+
+	lr	2,cylimb
+	lm	6,7,24(15)
+	br	14
+EPILOGUE(mpn_mul_1)