1/*
2 * Copyright (c) 2015 ARM Ltd
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. The name of the company may not be used to endorse or promote
14 *    products derived from this software without specific prior written
15 *    permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY ARM LTD ``AS IS'' AND ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL ARM LTD BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
22 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
23 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
24 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
25 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
26 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#include "arm_asm.h"
30
31	.thumb
32	.syntax unified
33	.global memset
34	.type	memset, %function
35	.p2align 1
36memset:
37	.fnstart
38	.cfi_sections .debug_frame
39	.cfi_startproc
40	prologue 4 6 push_ip=HAVE_PAC_LEAF
41	lsls	r4, r0, #30
42	beq	10f
43	subs	r4, r2, #1
44	cmp	r2, #0
45	beq	9f
46	uxtb	r5, r1
47	mov	r3, r0
48	b	2f
491:
50	subs	r2, r4, #1
51	cbz	r4, 9f
52	mov	r4, r2
532:
54	strb	r5, [r3], #1
55	lsls	r2, r3, #30
56	bne	1b
573:
58	cmp	r4, #3
59	bls	7f
60	uxtb	r5, r1
61	orr	r5, r5, r5, lsl #8
62	cmp	r4, #15
63	orr	r5, r5, r5, lsl #16
64	bls	5f
65	mov	r6, r4
66	add	r2, r3, #16
674:
68	subs	r6, r6, #16
69	cmp	r6, #15
70	str	r5, [r2, #-16]
71	str	r5, [r2, #-12]
72	str	r5, [r2, #-8]
73	str	r5, [r2, #-4]
74	add	r2, r2, #16
75	bhi	4b
76	sub	r2, r4, #16
77	bic	r2, r2, #15
78	and	r4, r4, #15
79	adds	r2, r2, #16
80	cmp	r4, #3
81	add	r3, r3, r2
82	bls	7f
835:
84	mov	r6, r3
85	mov	r2, r4
866:
87	subs	r2, r2, #4
88	cmp	r2, #3
89	str	r5, [r6], #4
90	bhi	6b
91	subs	r2, r4, #4
92	bic	r2, r2, #3
93	adds	r2, r2, #4
94	add	r3, r3, r2
95	and	r4, r4, #3
967:
97	cbz	r4, 9f
98	uxtb	r1, r1
99	add	r4, r4, r3
1008:
101	strb	r1, [r3], #1
102	cmp	r3, r4
103	bne	8b
1049:
105	.cfi_remember_state
106	epilogue 4 6 push_ip=HAVE_PAC_LEAF
107	.cfi_restore_state
10810:
109	mov	r4, r2
110	mov	r3, r0
111	b	3b
112	.cfi_endproc
113	.cantunwind
114	.fnend
115	.size memset, . - memset
116
117#if defined(__linux__) && defined(__ELF__)
118.section .note.GNU-stack,"",%progbits
119#endif
120