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
25 ENTRY(__muldi3)
26 ENTRY(__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
44 ENDPROC(__muldi3)
45 ENDPROC(__aeabi_lmul)
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