1/*
2 * String handling functions for PowerPC.
3 *
4 * Copyright (C) 1996 Paul Mackerras.
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11#include <asm/processor.h>
12#include <asm/errno.h>
13#include <asm/ppc_asm.h>
14
15_GLOBAL(memset)
16	neg	r0,r3
17	rlwimi	r4,r4,8,16,23
18	andi.	r0,r0,7			/* # bytes to be 8-byte aligned */
19	rlwimi	r4,r4,16,0,15
20	cmplw	cr1,r5,r0		/* do we get that far? */
21	rldimi	r4,r4,32,0
22	PPC_MTOCRF(1,r0)
23	mr	r6,r3
24	blt	cr1,8f
25	beq+	3f			/* if already 8-byte aligned */
26	subf	r5,r0,r5
27	bf	31,1f
28	stb	r4,0(r6)
29	addi	r6,r6,1
301:	bf	30,2f
31	sth	r4,0(r6)
32	addi	r6,r6,2
332:	bf	29,3f
34	stw	r4,0(r6)
35	addi	r6,r6,4
363:	srdi.	r0,r5,6
37	clrldi	r5,r5,58
38	mtctr	r0
39	beq	5f
404:	std	r4,0(r6)
41	std	r4,8(r6)
42	std	r4,16(r6)
43	std	r4,24(r6)
44	std	r4,32(r6)
45	std	r4,40(r6)
46	std	r4,48(r6)
47	std	r4,56(r6)
48	addi	r6,r6,64
49	bdnz	4b
505:	srwi.	r0,r5,3
51	clrlwi	r5,r5,29
52	PPC_MTOCRF(1,r0)
53	beq	8f
54	bf	29,6f
55	std	r4,0(r6)
56	std	r4,8(r6)
57	std	r4,16(r6)
58	std	r4,24(r6)
59	addi	r6,r6,32
606:	bf	30,7f
61	std	r4,0(r6)
62	std	r4,8(r6)
63	addi	r6,r6,16
647:	bf	31,8f
65	std	r4,0(r6)
66	addi	r6,r6,8
678:	cmpwi	r5,0
68	PPC_MTOCRF(1,r5)
69	beqlr+
70	bf	29,9f
71	stw	r4,0(r6)
72	addi	r6,r6,4
739:	bf	30,10f
74	sth	r4,0(r6)
75	addi	r6,r6,2
7610:	bflr	31
77	stb	r4,0(r6)
78	blr
79
80_GLOBAL_TOC(memmove)
81	cmplw	0,r3,r4
82	bgt	backwards_memcpy
83	b	memcpy
84
85_GLOBAL(backwards_memcpy)
86	rlwinm.	r7,r5,32-3,3,31		/* r0 = r5 >> 3 */
87	add	r6,r3,r5
88	add	r4,r4,r5
89	beq	2f
90	andi.	r0,r6,3
91	mtctr	r7
92	bne	5f
931:	lwz	r7,-4(r4)
94	lwzu	r8,-8(r4)
95	stw	r7,-4(r6)
96	stwu	r8,-8(r6)
97	bdnz	1b
98	andi.	r5,r5,7
992:	cmplwi	0,r5,4
100	blt	3f
101	lwzu	r0,-4(r4)
102	subi	r5,r5,4
103	stwu	r0,-4(r6)
1043:	cmpwi	0,r5,0
105	beqlr
106	mtctr	r5
1074:	lbzu	r0,-1(r4)
108	stbu	r0,-1(r6)
109	bdnz	4b
110	blr
1115:	mtctr	r0
1126:	lbzu	r7,-1(r4)
113	stbu	r7,-1(r6)
114	bdnz	6b
115	subf	r5,r0,r5
116	rlwinm.	r7,r5,32-3,3,31
117	beq	2b
118	mtctr	r7
119	b	1b
120