10Sstevel@tonic-gate/* 20Sstevel@tonic-gate * CDDL HEADER START 30Sstevel@tonic-gate * 40Sstevel@tonic-gate * The contents of this file are subject to the terms of the 56515Sraf * Common Development and Distribution License (the "License"). 66515Sraf * You may not use this file except in compliance with the License. 70Sstevel@tonic-gate * 80Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 90Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 100Sstevel@tonic-gate * See the License for the specific language governing permissions 110Sstevel@tonic-gate * and limitations under the License. 120Sstevel@tonic-gate * 130Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 140Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 150Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 160Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 170Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 180Sstevel@tonic-gate * 190Sstevel@tonic-gate * CDDL HEADER END 200Sstevel@tonic-gate */ 216515Sraf 220Sstevel@tonic-gate/* 236515Sraf * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 240Sstevel@tonic-gate * Use is subject to license terms. 250Sstevel@tonic-gate */ 260Sstevel@tonic-gate 27*7298SMark.J.Nelson@Sun.COM .file "memset.s" 280Sstevel@tonic-gate 290Sstevel@tonic-gate/* 300Sstevel@tonic-gate * char *memset(sp, c, n) 310Sstevel@tonic-gate * 320Sstevel@tonic-gate * Set an array of n chars starting at sp to the character c. 330Sstevel@tonic-gate * Return sp. 340Sstevel@tonic-gate * 350Sstevel@tonic-gate * Fast assembler language version of the following C-program for memset 360Sstevel@tonic-gate * which represents the `standard' for the C-library. 370Sstevel@tonic-gate * 380Sstevel@tonic-gate * void * 390Sstevel@tonic-gate * memset(void *sp1, int c, size_t n) 400Sstevel@tonic-gate * { 410Sstevel@tonic-gate * if (n != 0) { 420Sstevel@tonic-gate * char *sp = sp1; 430Sstevel@tonic-gate * do { 440Sstevel@tonic-gate * *sp++ = (char)c; 450Sstevel@tonic-gate * } while (--n != 0); 460Sstevel@tonic-gate * } 470Sstevel@tonic-gate * return (sp1); 480Sstevel@tonic-gate * } 490Sstevel@tonic-gate */ 500Sstevel@tonic-gate 510Sstevel@tonic-gate#include <sys/asm_linkage.h> 520Sstevel@tonic-gate 530Sstevel@tonic-gate ANSI_PRAGMA_WEAK(memset,function) 540Sstevel@tonic-gate 550Sstevel@tonic-gate ENTRY(memset) 560Sstevel@tonic-gate mov %o0, %o5 ! copy sp before using it 570Sstevel@tonic-gate cmp %o2, 7 ! if small counts, just write bytes 580Sstevel@tonic-gate blu .wrchar 590Sstevel@tonic-gate .empty ! following lable is ok in delay slot 600Sstevel@tonic-gate 610Sstevel@tonic-gate.walign:btst 3, %o5 ! if bigger, align to 4 bytes 620Sstevel@tonic-gate bz .wrword 630Sstevel@tonic-gate andn %o2, 3, %o3 ! create word sized count in %o3 640Sstevel@tonic-gate dec %o2 ! decrement count 650Sstevel@tonic-gate stb %o1, [%o5] ! clear a byte 660Sstevel@tonic-gate b .walign 670Sstevel@tonic-gate inc %o5 ! next byte 680Sstevel@tonic-gate 690Sstevel@tonic-gate.wrword:and %o1, 0xff, %o1 ! generate a word filled with c 700Sstevel@tonic-gate sll %o1, 8, %o4 710Sstevel@tonic-gate or %o1, %o4, %o1 720Sstevel@tonic-gate sll %o1, 16, %o4 730Sstevel@tonic-gate or %o1, %o4, %o1 740Sstevel@tonic-gate1: st %o1, [%o5] ! word writing loop 750Sstevel@tonic-gate subcc %o3, 4, %o3 760Sstevel@tonic-gate bnz 1b 770Sstevel@tonic-gate inc 4, %o5 780Sstevel@tonic-gate 790Sstevel@tonic-gate and %o2, 3, %o2 ! leftover count, if any 800Sstevel@tonic-gate.wrchar:deccc %o2 ! byte clearing loop 810Sstevel@tonic-gate inc %o5 820Sstevel@tonic-gate bgeu,a .wrchar 830Sstevel@tonic-gate stb %o1, [%o5 + -1] ! we've already incremented the address 840Sstevel@tonic-gate 850Sstevel@tonic-gate retl 860Sstevel@tonic-gate nop 870Sstevel@tonic-gate 880Sstevel@tonic-gate SET_SIZE(memset) 89