xref: /openbmc/linux/arch/arm/lib/muldi3.S (revision d2912cb1)
1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 *  linux/arch/arm/lib/muldi3.S
4 *
5 *  Author:     Nicolas Pitre
6 *  Created:    Oct 19, 2005
7 *  Copyright:  Monta Vista Software, Inc.
8 */
9
10#include <linux/linkage.h>
11#include <asm/assembler.h>
12
13#ifdef __ARMEB__
14#define xh r0
15#define xl r1
16#define yh r2
17#define yl r3
18#else
19#define xl r0
20#define xh r1
21#define yl r2
22#define yh r3
23#endif
24
25ENTRY(__muldi3)
26ENTRY(__aeabi_lmul)
27
28	mul	xh, yl, xh
29	mla	xh, xl, yh, xh
30	mov	ip, xl, lsr #16
31	mov	yh, yl, lsr #16
32	bic	xl, xl, ip, lsl #16
33	bic	yl, yl, yh, lsl #16
34	mla	xh, yh, ip, xh
35	mul	yh, xl, yh
36	mul	xl, yl, xl
37	mul	ip, yl, ip
38	adds	xl, xl, yh, lsl #16
39	adc	xh, xh, yh, lsr #16
40	adds	xl, xl, ip, lsl #16
41	adc	xh, xh, ip, lsr #16
42	ret	lr
43
44ENDPROC(__muldi3)
45ENDPROC(__aeabi_lmul)
46