1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * Copyright (C) 2004, 2007-2010, 2011-2012 Sy
4 */
5
6 #include <linux/linkage.h>
7
8 ENTRY_CFI(strlen)
9 or r3,r0,7
10 ld r2,[r3,-7]
11 ld.a r6,[r3,-3]
12 mov r4,0x01010101
13 ; uses long immediate
14 #ifdef __LITTLE_ENDIAN__
15 asl_s r1,r0,3
16 btst_s r0,2
17 asl r7,r4,r1
18 ror r5,r4
19 sub r1,r2,r7
20 bic_s r1,r1,r2
21 mov.eq r7,r4
22 sub r12,r6,r7
23 bic r12,r12,r6
24 or.eq r12,r12,r1
25 and r12,r12,r5
26 brne r12,0,.Learly_end
27 #else /* BIG ENDIAN */
28 ror r5,r4
29 btst_s r0,2
30 mov_s r1,31
31 sub3 r7,r1,r0
32 sub r1,r2,r4
33 bic_s r1,r1,r2
34 bmsk r1,r1,r7
35 sub r12,r6,r4
36 bic r12,r12,r6
37 bmsk.ne r12,r12,r7
38 or.eq r12,r12,r1
39 and r12,r12,r5
40 brne r12,0,.Learly_end
41 #endif /* ENDIAN */
42
43 .Loop:
44 ld_s r2,[r3,4]
45 ld.a r6,[r3,8]
46 ; stall for load result
47 sub r1,r2,r4
48 bic_s r1,r1,r2
49 sub r12,r6,r4
50 bic r12,r12,r6
51 or r12,r12,r1
52 and r12,r12,r5
53 breq r12,0,.Loop
54 .Lend:
55 and.f r1,r1,r5
56 sub.ne r3,r3,4
57 mov.eq r1,r12
58 #ifdef __LITTLE_ENDIAN__
59 sub_s r2,r1,1
60 bic_s r2,r2,r1
61 norm r1,r2
62 sub_s r0,r0,3
63 lsr_s r1,r1,3
64 sub r0,r3,r0
65 j_s.d [blink]
66 sub r0,r0,r1
67 #else /* BIG ENDIAN */
68 lsr_s r1,r1,7
69 mov.eq r2,r6
70 bic_s r1,r1,r2
71 norm r1,r1
72 sub r0,r3,r0
73 lsr_s r1,r1,3
74 j_s.d [blink]
75 add r0,r0,r1
76 #endif /* ENDIAN */
77 .Learly_end:
78 b.d .Lend
79 sub_s.ne r1,r1,r1
80 END_CFI(strlen)
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