18c2ecf20Sopenharmony_ci/* SPDX-License-Identifier: GPL-2.0 */ 28c2ecf20Sopenharmony_ci/* memmove.S: Simple memmove implementation. 38c2ecf20Sopenharmony_ci * 48c2ecf20Sopenharmony_ci * Copyright (C) 1997, 2004 David S. Miller (davem@redhat.com) 58c2ecf20Sopenharmony_ci * Copyright (C) 1996, 1997, 1998, 1999 Jakub Jelinek (jj@ultra.linux.cz) 68c2ecf20Sopenharmony_ci */ 78c2ecf20Sopenharmony_ci 88c2ecf20Sopenharmony_ci#include <linux/linkage.h> 98c2ecf20Sopenharmony_ci#include <asm/export.h> 108c2ecf20Sopenharmony_ci 118c2ecf20Sopenharmony_ci .text 128c2ecf20Sopenharmony_ciENTRY(memmove) /* o0=dst o1=src o2=len */ 138c2ecf20Sopenharmony_ci brz,pn %o2, 99f 148c2ecf20Sopenharmony_ci mov %o0, %g1 158c2ecf20Sopenharmony_ci 168c2ecf20Sopenharmony_ci cmp %o0, %o1 178c2ecf20Sopenharmony_ci bleu,pt %xcc, 2f 188c2ecf20Sopenharmony_ci add %o1, %o2, %g7 198c2ecf20Sopenharmony_ci cmp %g7, %o0 208c2ecf20Sopenharmony_ci bleu,pt %xcc, memcpy 218c2ecf20Sopenharmony_ci add %o0, %o2, %o5 228c2ecf20Sopenharmony_ci sub %g7, 1, %o1 238c2ecf20Sopenharmony_ci 248c2ecf20Sopenharmony_ci sub %o5, 1, %o0 258c2ecf20Sopenharmony_ci1: ldub [%o1], %g7 268c2ecf20Sopenharmony_ci subcc %o2, 1, %o2 278c2ecf20Sopenharmony_ci sub %o1, 1, %o1 288c2ecf20Sopenharmony_ci stb %g7, [%o0] 298c2ecf20Sopenharmony_ci bne,pt %icc, 1b 308c2ecf20Sopenharmony_ci sub %o0, 1, %o0 318c2ecf20Sopenharmony_ci99: 328c2ecf20Sopenharmony_ci retl 338c2ecf20Sopenharmony_ci mov %g1, %o0 348c2ecf20Sopenharmony_ci 358c2ecf20Sopenharmony_ci /* We can't just call memcpy for these memmove cases. On some 368c2ecf20Sopenharmony_ci * chips the memcpy uses cache initializing stores and when dst 378c2ecf20Sopenharmony_ci * and src are close enough, those can clobber the source data 388c2ecf20Sopenharmony_ci * before we've loaded it in. 398c2ecf20Sopenharmony_ci */ 408c2ecf20Sopenharmony_ci2: or %o0, %o1, %g7 418c2ecf20Sopenharmony_ci or %o2, %g7, %g7 428c2ecf20Sopenharmony_ci andcc %g7, 0x7, %g0 438c2ecf20Sopenharmony_ci bne,pn %xcc, 4f 448c2ecf20Sopenharmony_ci nop 458c2ecf20Sopenharmony_ci 468c2ecf20Sopenharmony_ci3: ldx [%o1], %g7 478c2ecf20Sopenharmony_ci add %o1, 8, %o1 488c2ecf20Sopenharmony_ci subcc %o2, 8, %o2 498c2ecf20Sopenharmony_ci add %o0, 8, %o0 508c2ecf20Sopenharmony_ci bne,pt %icc, 3b 518c2ecf20Sopenharmony_ci stx %g7, [%o0 - 0x8] 528c2ecf20Sopenharmony_ci ba,a,pt %xcc, 99b 538c2ecf20Sopenharmony_ci 548c2ecf20Sopenharmony_ci4: ldub [%o1], %g7 558c2ecf20Sopenharmony_ci add %o1, 1, %o1 568c2ecf20Sopenharmony_ci subcc %o2, 1, %o2 578c2ecf20Sopenharmony_ci add %o0, 1, %o0 588c2ecf20Sopenharmony_ci bne,pt %icc, 4b 598c2ecf20Sopenharmony_ci stb %g7, [%o0 - 0x1] 608c2ecf20Sopenharmony_ci ba,a,pt %xcc, 99b 618c2ecf20Sopenharmony_ciENDPROC(memmove) 628c2ecf20Sopenharmony_ciEXPORT_SYMBOL(memmove) 63