1/* strlen_user.S: Sparc64 optimized strlen_user code
2 *
3 * Return length of string in userspace including terminating 0
4 * or 0 for error
5 *
6 * Copyright (C) 1991,1996 Free Software Foundation
7 * Copyright (C) 1996,1999 David S. Miller (davem@redhat.com)
8 * Copyright (C) 1996,1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
9 */
10
11#include <asm/asi.h>
12
13#define LO_MAGIC 0x01010101
14#define HI_MAGIC 0x80808080
15
16	.align 4
17	.global __strlen_user, __strnlen_user
18__strlen_user:
19	sethi	%hi(32768), %o1
20__strnlen_user:
21	mov	%o1, %g1
22	mov	%o0, %o1
23	andcc	%o0, 3, %g0
24	be,pt	%icc, 9f
25	 sethi	%hi(HI_MAGIC), %o4
2610:	lduba	[%o0] %asi, %o5
27	brz,pn	%o5, 21f
28	 add	%o0, 1, %o0
29	andcc	%o0, 3, %g0
30	be,pn	%icc, 4f
31	 or	%o4, %lo(HI_MAGIC), %o3
3211:	lduba	[%o0] %asi, %o5
33	brz,pn	%o5, 22f
34	 add	%o0, 1, %o0
35	andcc	%o0, 3, %g0
36	be,pt	%icc, 13f
37	 srl	%o3, 7, %o2
3812:	lduba	[%o0] %asi, %o5
39	brz,pn	%o5, 23f
40	 add	%o0, 1, %o0
41	ba,pt	%icc, 2f
4215:	 lda	[%o0] %asi, %o5
439:	or	%o4, %lo(HI_MAGIC), %o3
444:	srl	%o3, 7, %o2
4513:	lda	[%o0] %asi, %o5
462:	sub	%o5, %o2, %o4
47	andcc	%o4, %o3, %g0
48	bne,pn	%icc, 82f
49	 add	%o0, 4, %o0
50	sub	%o0, %o1, %g2
5181:	cmp	%g2, %g1
52	blu,pt	%icc, 13b
53	 mov	%o0, %o4
54	ba,a,pt	%xcc, 1f
55
56	/* Check every byte. */
5782:	srl	%o5, 24, %g7
58	andcc	%g7, 0xff, %g0
59	be,pn	%icc, 1f
60	 add	%o0, -3, %o4
61	srl	%o5, 16, %g7
62	andcc	%g7, 0xff, %g0
63	be,pn	%icc, 1f
64	 add	%o4, 1, %o4
65	srl	%o5, 8, %g7
66	andcc	%g7, 0xff, %g0
67	be,pn	%icc, 1f
68	 add	%o4, 1, %o4
69	andcc	%o5, 0xff, %g0
70	bne,pt	%icc, 81b
71	 sub	%o0, %o1, %g2
72	add	%o4, 1, %o4
731:	retl
74	 sub	%o4, %o1, %o0
7521:	retl
76	 mov	1, %o0
7722:	retl
78	 mov	2, %o0
7923:	retl
80	 mov	3, %o0
81
82        .section .fixup,#alloc,#execinstr
83        .align  4
8430:
85        retl
86         clr    %o0
87
88	.section __ex_table,"a"
89	.align	4
90
91	.word	10b, 30b
92	.word	11b, 30b
93	.word	12b, 30b
94	.word	15b, 30b
95	.word	13b, 30b
96