1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Copyright (C) 2014-15 Synopsys, Inc. (www.synopsys.com) 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 same 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) 76