18c2ecf20Sopenharmony_ci/* SPDX-License-Identifier: GPL-2.0 */ 28c2ecf20Sopenharmony_ci/* strlen.S: Sparc optimized strlen code 38c2ecf20Sopenharmony_ci * Hand optimized from GNU libc's strlen 48c2ecf20Sopenharmony_ci * Copyright (C) 1991,1996 Free Software Foundation 58c2ecf20Sopenharmony_ci * Copyright (C) 1996,2008 David S. Miller (davem@davemloft.net) 68c2ecf20Sopenharmony_ci * Copyright (C) 1996, 1997 Jakub Jelinek (jj@sunsite.mff.cuni.cz) 78c2ecf20Sopenharmony_ci */ 88c2ecf20Sopenharmony_ci 98c2ecf20Sopenharmony_ci#include <linux/linkage.h> 108c2ecf20Sopenharmony_ci#include <asm/asm.h> 118c2ecf20Sopenharmony_ci#include <asm/export.h> 128c2ecf20Sopenharmony_ci 138c2ecf20Sopenharmony_ci#define LO_MAGIC 0x01010101 148c2ecf20Sopenharmony_ci#define HI_MAGIC 0x80808080 158c2ecf20Sopenharmony_ci 168c2ecf20Sopenharmony_ci .text 178c2ecf20Sopenharmony_ciENTRY(strlen) 188c2ecf20Sopenharmony_ci mov %o0, %o1 198c2ecf20Sopenharmony_ci andcc %o0, 3, %g0 208c2ecf20Sopenharmony_ci BRANCH32(be, pt, 9f) 218c2ecf20Sopenharmony_ci sethi %hi(HI_MAGIC), %o4 228c2ecf20Sopenharmony_ci ldub [%o0], %o5 238c2ecf20Sopenharmony_ci BRANCH_REG_ZERO(pn, %o5, 11f) 248c2ecf20Sopenharmony_ci add %o0, 1, %o0 258c2ecf20Sopenharmony_ci andcc %o0, 3, %g0 268c2ecf20Sopenharmony_ci BRANCH32(be, pn, 4f) 278c2ecf20Sopenharmony_ci or %o4, %lo(HI_MAGIC), %o3 288c2ecf20Sopenharmony_ci ldub [%o0], %o5 298c2ecf20Sopenharmony_ci BRANCH_REG_ZERO(pn, %o5, 12f) 308c2ecf20Sopenharmony_ci add %o0, 1, %o0 318c2ecf20Sopenharmony_ci andcc %o0, 3, %g0 328c2ecf20Sopenharmony_ci BRANCH32(be, pt, 5f) 338c2ecf20Sopenharmony_ci sethi %hi(LO_MAGIC), %o4 348c2ecf20Sopenharmony_ci ldub [%o0], %o5 358c2ecf20Sopenharmony_ci BRANCH_REG_ZERO(pn, %o5, 13f) 368c2ecf20Sopenharmony_ci add %o0, 1, %o0 378c2ecf20Sopenharmony_ci BRANCH32(ba, pt, 8f) 388c2ecf20Sopenharmony_ci or %o4, %lo(LO_MAGIC), %o2 398c2ecf20Sopenharmony_ci9: 408c2ecf20Sopenharmony_ci or %o4, %lo(HI_MAGIC), %o3 418c2ecf20Sopenharmony_ci4: 428c2ecf20Sopenharmony_ci sethi %hi(LO_MAGIC), %o4 438c2ecf20Sopenharmony_ci5: 448c2ecf20Sopenharmony_ci or %o4, %lo(LO_MAGIC), %o2 458c2ecf20Sopenharmony_ci8: 468c2ecf20Sopenharmony_ci ld [%o0], %o5 478c2ecf20Sopenharmony_ci2: 488c2ecf20Sopenharmony_ci sub %o5, %o2, %o4 498c2ecf20Sopenharmony_ci andcc %o4, %o3, %g0 508c2ecf20Sopenharmony_ci BRANCH32(be, pt, 8b) 518c2ecf20Sopenharmony_ci add %o0, 4, %o0 528c2ecf20Sopenharmony_ci 538c2ecf20Sopenharmony_ci /* Check every byte. */ 548c2ecf20Sopenharmony_ci srl %o5, 24, %g7 558c2ecf20Sopenharmony_ci andcc %g7, 0xff, %g0 568c2ecf20Sopenharmony_ci BRANCH32(be, pn, 1f) 578c2ecf20Sopenharmony_ci add %o0, -4, %o4 588c2ecf20Sopenharmony_ci srl %o5, 16, %g7 598c2ecf20Sopenharmony_ci andcc %g7, 0xff, %g0 608c2ecf20Sopenharmony_ci BRANCH32(be, pn, 1f) 618c2ecf20Sopenharmony_ci add %o4, 1, %o4 628c2ecf20Sopenharmony_ci srl %o5, 8, %g7 638c2ecf20Sopenharmony_ci andcc %g7, 0xff, %g0 648c2ecf20Sopenharmony_ci BRANCH32(be, pn, 1f) 658c2ecf20Sopenharmony_ci add %o4, 1, %o4 668c2ecf20Sopenharmony_ci andcc %o5, 0xff, %g0 678c2ecf20Sopenharmony_ci BRANCH32_ANNUL(bne, pt, 2b) 688c2ecf20Sopenharmony_ci ld [%o0], %o5 698c2ecf20Sopenharmony_ci add %o4, 1, %o4 708c2ecf20Sopenharmony_ci1: 718c2ecf20Sopenharmony_ci retl 728c2ecf20Sopenharmony_ci sub %o4, %o1, %o0 738c2ecf20Sopenharmony_ci11: 748c2ecf20Sopenharmony_ci retl 758c2ecf20Sopenharmony_ci mov 0, %o0 768c2ecf20Sopenharmony_ci12: 778c2ecf20Sopenharmony_ci retl 788c2ecf20Sopenharmony_ci mov 1, %o0 798c2ecf20Sopenharmony_ci13: 808c2ecf20Sopenharmony_ci retl 818c2ecf20Sopenharmony_ci mov 2, %o0 828c2ecf20Sopenharmony_ciENDPROC(strlen) 838c2ecf20Sopenharmony_ciEXPORT_SYMBOL(strlen) 84