1/* SPDX-License-Identifier: GPL-2.0-only */ 2/* 3 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) 4 */ 5 6#include <linux/linkage.h> 7 8ENTRY_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 80END_CFI(strlen) 81