1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * Copyright (C) 2014-15 Synopsys, Inc. (www.s
4 */
5
6 #include <linux/linkage.h>
7
8 ENTRY_CFI(strcmp)
9 or r2, r0, r1
10 bmsk_s r2, r2, 1
11 brne r2, 0, @.Lcharloop
12
13 ;;; s1 and s2 are word aligned
14 ld.ab r2, [r0, 4]
15
16 mov_s r12, 0x01010101
17 ror r11, r12
18 .align 4
19 .LwordLoop:
20 ld.ab r3, [r1, 4]
21 ;; Detect NULL char in str1
22 sub r4, r2, r12
23 ld.ab r5, [r0, 4]
24 bic r4, r4, r2
25 and r4, r4, r11
26 brne.d.nt r4, 0, .LfoundNULL
27 ;; Check if the read locations are the
28 cmp r2, r3
29 beq.d .LwordLoop
30 mov.eq r2, r5
31
32 ;; A match is found, spot it out
33 #ifdef __LITTLE_ENDIAN__
34 swape r3, r3
35 mov_s r0, 1
36 swape r2, r2
37 #else
38 mov_s r0, 1
39 #endif
40 cmp_s r2, r3
41 j_s.d [blink]
42 bset.lo r0, r0, 31
43
44 .align 4
45 .LfoundNULL:
46 #ifdef __BIG_ENDIAN__
47 swape r4, r4
48 swape r2, r2
49 swape r3, r3
50 #endif
51 ;; Find null byte
52 ffs r0, r4
53 bmsk r2, r2, r0
54 bmsk r3, r3, r0
55 swape r2, r2
56 swape r3, r3
57 ;; make the return value
58 sub.f r0, r2, r3
59 mov.hi r0, 1
60 j_s.d [blink]
61 bset.lo r0, r0, 31
62
63 .align 4
64 .Lcharloop:
65 ldb.ab r2, [r0, 1]
66 ldb.ab r3, [r1, 1]
67 nop
68 breq r2, 0, .Lcmpend
69 breq r2, r3, .Lcharloop
70
71 .align 4
72 .Lcmpend:
73 j_s.d [blink]
74 sub r0, r2, r3
75 END_CFI(strcmp)
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.