18c2ecf20Sopenharmony_ci/* SPDX-License-Identifier: GPL-2.0 */ 28c2ecf20Sopenharmony_ci/* memset.S */ 38c2ecf20Sopenharmony_ci 48c2ecf20Sopenharmony_ci#include <asm/linkage.h> 58c2ecf20Sopenharmony_ci 68c2ecf20Sopenharmony_ci#if defined(CONFIG_CPU_H8300H) 78c2ecf20Sopenharmony_ci .h8300h 88c2ecf20Sopenharmony_ci#endif 98c2ecf20Sopenharmony_ci#if defined(CONFIG_CPU_H8S) 108c2ecf20Sopenharmony_ci .h8300s 118c2ecf20Sopenharmony_ci#endif 128c2ecf20Sopenharmony_ci .text 138c2ecf20Sopenharmony_ci 148c2ecf20Sopenharmony_ci.global memset 158c2ecf20Sopenharmony_ci.global clear_user 168c2ecf20Sopenharmony_ci 178c2ecf20Sopenharmony_ci;;void *memset(*ptr, int c, size_t count) 188c2ecf20Sopenharmony_ci;; ptr = er0 198c2ecf20Sopenharmony_ci;; c = er1(r1l) 208c2ecf20Sopenharmony_ci;; count = er2 218c2ecf20Sopenharmony_cimemset: 228c2ecf20Sopenharmony_ci btst #0,r0l 238c2ecf20Sopenharmony_ci beq 2f 248c2ecf20Sopenharmony_ci 258c2ecf20Sopenharmony_ci ;; odd address 268c2ecf20Sopenharmony_ci1: 278c2ecf20Sopenharmony_ci mov.b r1l,@er0 288c2ecf20Sopenharmony_ci adds #1,er0 298c2ecf20Sopenharmony_ci dec.l #1,er2 308c2ecf20Sopenharmony_ci beq 6f 318c2ecf20Sopenharmony_ci 328c2ecf20Sopenharmony_ci ;; even address 338c2ecf20Sopenharmony_ci2: 348c2ecf20Sopenharmony_ci mov.l er2,er3 358c2ecf20Sopenharmony_ci cmp.l #4,er2 368c2ecf20Sopenharmony_ci blo 4f 378c2ecf20Sopenharmony_ci ;; count>=4 -> count/4 388c2ecf20Sopenharmony_ci#if defined(CONFIG_CPU_H8300H) 398c2ecf20Sopenharmony_ci shlr.l er2 408c2ecf20Sopenharmony_ci shlr.l er2 418c2ecf20Sopenharmony_ci#endif 428c2ecf20Sopenharmony_ci#if defined(CONFIG_CPU_H8S) 438c2ecf20Sopenharmony_ci shlr.l #2,er2 448c2ecf20Sopenharmony_ci#endif 458c2ecf20Sopenharmony_ci ;; byte -> long 468c2ecf20Sopenharmony_ci mov.b r1l,r1h 478c2ecf20Sopenharmony_ci mov.w r1,e1 488c2ecf20Sopenharmony_ci3: 498c2ecf20Sopenharmony_ci mov.l er1,@er0 508c2ecf20Sopenharmony_ci adds #4,er0 518c2ecf20Sopenharmony_ci dec.l #1,er2 528c2ecf20Sopenharmony_ci bne 3b 538c2ecf20Sopenharmony_ci4: 548c2ecf20Sopenharmony_ci ;; count % 4 558c2ecf20Sopenharmony_ci and.b #3,r3l 568c2ecf20Sopenharmony_ci beq 6f 578c2ecf20Sopenharmony_ci5: 588c2ecf20Sopenharmony_ci mov.b r1l,@er0 598c2ecf20Sopenharmony_ci adds #1,er0 608c2ecf20Sopenharmony_ci dec.b r3l 618c2ecf20Sopenharmony_ci bne 5b 628c2ecf20Sopenharmony_ci6: 638c2ecf20Sopenharmony_ci rts 648c2ecf20Sopenharmony_ci 658c2ecf20Sopenharmony_ciclear_user: 668c2ecf20Sopenharmony_ci mov.l er1, er2 678c2ecf20Sopenharmony_ci sub.l er1, er1 688c2ecf20Sopenharmony_ci bra memset 698c2ecf20Sopenharmony_ci 708c2ecf20Sopenharmony_ci .end 71