162306a36Sopenharmony_ci/* SPDX-License-Identifier: GPL-2.0-only */ 262306a36Sopenharmony_ci/* 362306a36Sopenharmony_ci * Copyright (C) 2014-15 Synopsys, Inc. (www.synopsys.com) 462306a36Sopenharmony_ci */ 562306a36Sopenharmony_ci 662306a36Sopenharmony_ci#include <linux/linkage.h> 762306a36Sopenharmony_ci 862306a36Sopenharmony_ciENTRY_CFI(strcmp) 962306a36Sopenharmony_ci or r2, r0, r1 1062306a36Sopenharmony_ci bmsk_s r2, r2, 1 1162306a36Sopenharmony_ci brne r2, 0, @.Lcharloop 1262306a36Sopenharmony_ci 1362306a36Sopenharmony_ci;;; s1 and s2 are word aligned 1462306a36Sopenharmony_ci ld.ab r2, [r0, 4] 1562306a36Sopenharmony_ci 1662306a36Sopenharmony_ci mov_s r12, 0x01010101 1762306a36Sopenharmony_ci ror r11, r12 1862306a36Sopenharmony_ci .align 4 1962306a36Sopenharmony_ci.LwordLoop: 2062306a36Sopenharmony_ci ld.ab r3, [r1, 4] 2162306a36Sopenharmony_ci ;; Detect NULL char in str1 2262306a36Sopenharmony_ci sub r4, r2, r12 2362306a36Sopenharmony_ci ld.ab r5, [r0, 4] 2462306a36Sopenharmony_ci bic r4, r4, r2 2562306a36Sopenharmony_ci and r4, r4, r11 2662306a36Sopenharmony_ci brne.d.nt r4, 0, .LfoundNULL 2762306a36Sopenharmony_ci ;; Check if the read locations are the same 2862306a36Sopenharmony_ci cmp r2, r3 2962306a36Sopenharmony_ci beq.d .LwordLoop 3062306a36Sopenharmony_ci mov.eq r2, r5 3162306a36Sopenharmony_ci 3262306a36Sopenharmony_ci ;; A match is found, spot it out 3362306a36Sopenharmony_ci#ifdef __LITTLE_ENDIAN__ 3462306a36Sopenharmony_ci swape r3, r3 3562306a36Sopenharmony_ci mov_s r0, 1 3662306a36Sopenharmony_ci swape r2, r2 3762306a36Sopenharmony_ci#else 3862306a36Sopenharmony_ci mov_s r0, 1 3962306a36Sopenharmony_ci#endif 4062306a36Sopenharmony_ci cmp_s r2, r3 4162306a36Sopenharmony_ci j_s.d [blink] 4262306a36Sopenharmony_ci bset.lo r0, r0, 31 4362306a36Sopenharmony_ci 4462306a36Sopenharmony_ci .align 4 4562306a36Sopenharmony_ci.LfoundNULL: 4662306a36Sopenharmony_ci#ifdef __BIG_ENDIAN__ 4762306a36Sopenharmony_ci swape r4, r4 4862306a36Sopenharmony_ci swape r2, r2 4962306a36Sopenharmony_ci swape r3, r3 5062306a36Sopenharmony_ci#endif 5162306a36Sopenharmony_ci ;; Find null byte 5262306a36Sopenharmony_ci ffs r0, r4 5362306a36Sopenharmony_ci bmsk r2, r2, r0 5462306a36Sopenharmony_ci bmsk r3, r3, r0 5562306a36Sopenharmony_ci swape r2, r2 5662306a36Sopenharmony_ci swape r3, r3 5762306a36Sopenharmony_ci ;; make the return value 5862306a36Sopenharmony_ci sub.f r0, r2, r3 5962306a36Sopenharmony_ci mov.hi r0, 1 6062306a36Sopenharmony_ci j_s.d [blink] 6162306a36Sopenharmony_ci bset.lo r0, r0, 31 6262306a36Sopenharmony_ci 6362306a36Sopenharmony_ci .align 4 6462306a36Sopenharmony_ci.Lcharloop: 6562306a36Sopenharmony_ci ldb.ab r2, [r0, 1] 6662306a36Sopenharmony_ci ldb.ab r3, [r1, 1] 6762306a36Sopenharmony_ci nop 6862306a36Sopenharmony_ci breq r2, 0, .Lcmpend 6962306a36Sopenharmony_ci breq r2, r3, .Lcharloop 7062306a36Sopenharmony_ci 7162306a36Sopenharmony_ci .align 4 7262306a36Sopenharmony_ci.Lcmpend: 7362306a36Sopenharmony_ci j_s.d [blink] 7462306a36Sopenharmony_ci sub r0, r2, r3 7562306a36Sopenharmony_ciEND_CFI(strcmp) 76