1*5d9d9091SRichard Lowe/* 2*5d9d9091SRichard Lowe * CDDL HEADER START 3*5d9d9091SRichard Lowe * 4*5d9d9091SRichard Lowe * The contents of this file are subject to the terms of the 5*5d9d9091SRichard Lowe * Common Development and Distribution License (the "License"). 6*5d9d9091SRichard Lowe * You may not use this file except in compliance with the License. 7*5d9d9091SRichard Lowe * 8*5d9d9091SRichard Lowe * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9*5d9d9091SRichard Lowe * or http://www.opensolaris.org/os/licensing. 10*5d9d9091SRichard Lowe * See the License for the specific language governing permissions 11*5d9d9091SRichard Lowe * and limitations under the License. 12*5d9d9091SRichard Lowe * 13*5d9d9091SRichard Lowe * When distributing Covered Code, include this CDDL HEADER in each 14*5d9d9091SRichard Lowe * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15*5d9d9091SRichard Lowe * If applicable, add the following below this CDDL HEADER, with the 16*5d9d9091SRichard Lowe * fields enclosed by brackets "[]" replaced with your own identifying 17*5d9d9091SRichard Lowe * information: Portions Copyright [yyyy] [name of copyright owner] 18*5d9d9091SRichard Lowe * 19*5d9d9091SRichard Lowe * CDDL HEADER END 20*5d9d9091SRichard Lowe */ 21*5d9d9091SRichard Lowe 22*5d9d9091SRichard Lowe/* 23*5d9d9091SRichard Lowe * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 24*5d9d9091SRichard Lowe * Use is subject to license terms. 25*5d9d9091SRichard Lowe */ 26*5d9d9091SRichard Lowe 27*5d9d9091SRichard Lowe .file "memccpy.s" 28*5d9d9091SRichard Lowe 29*5d9d9091SRichard Lowe#include <sys/asm_linkage.h> 30*5d9d9091SRichard Lowe 31*5d9d9091SRichard Lowe ANSI_PRAGMA_WEAK(memccpy,function) 32*5d9d9091SRichard Lowe 33*5d9d9091SRichard Lowe ENTRY(memccpy) /* (void *dst, void *src, uchar_t c, size_t) */ 34*5d9d9091SRichard Lowe.loop: 35*5d9d9091SRichard Lowe decq %rcx / decrement bytes to go 36*5d9d9091SRichard Lowe jl .notfound 37*5d9d9091SRichard Lowe movb (%rsi),%dh 38*5d9d9091SRichard Lowe movb %dh,(%rdi) / move byte 39*5d9d9091SRichard Lowe cmpb %dh,%dl / is it the byte sought? 40*5d9d9091SRichard Lowe je .found / yes 41*5d9d9091SRichard Lowe 42*5d9d9091SRichard Lowe decq %rcx / decrement bytes to go 43*5d9d9091SRichard Lowe jl .notfound 44*5d9d9091SRichard Lowe movb 1(%rsi),%dh 45*5d9d9091SRichard Lowe movb %dh,1(%rdi) / move byte 46*5d9d9091SRichard Lowe cmpb %dh,%dl / is it the byte sought? 47*5d9d9091SRichard Lowe je .found1 / yes 48*5d9d9091SRichard Lowe 49*5d9d9091SRichard Lowe decq %rcx / decrement bytes to go 50*5d9d9091SRichard Lowe jl .notfound 51*5d9d9091SRichard Lowe movb 2(%rsi),%dh 52*5d9d9091SRichard Lowe movb %dh,2(%rdi) / move byte 53*5d9d9091SRichard Lowe cmpb %dh,%dl / is it the byte sought? 54*5d9d9091SRichard Lowe je .found2 / yes 55*5d9d9091SRichard Lowe 56*5d9d9091SRichard Lowe decq %rcx / decrement bytes to go 57*5d9d9091SRichard Lowe jl .notfound 58*5d9d9091SRichard Lowe movb 3(%rsi),%dh 59*5d9d9091SRichard Lowe movb %dh,3(%rdi) / move byte 60*5d9d9091SRichard Lowe addq $4,%rsi 61*5d9d9091SRichard Lowe addq $4,%rdi 62*5d9d9091SRichard Lowe cmpb %dh,%dl / is it the byte sought? 63*5d9d9091SRichard Lowe jne .loop / no 64*5d9d9091SRichard Lowe decq %rdi 65*5d9d9091SRichard Lowe 66*5d9d9091SRichard Lowe.found: 67*5d9d9091SRichard Lowe incq %rdi / return pointer to next byte in dest 68*5d9d9091SRichard Lowe movq %rdi,%rax 69*5d9d9091SRichard Lowe ret 70*5d9d9091SRichard Lowe 71*5d9d9091SRichard Lowe .align 4 72*5d9d9091SRichard Lowe.found2: 73*5d9d9091SRichard Lowe incq %rdi 74*5d9d9091SRichard Lowe.found1: 75*5d9d9091SRichard Lowe addq $2,%rdi / return pointer to next byte in dest 76*5d9d9091SRichard Lowe movq %rdi,%rax 77*5d9d9091SRichard Lowe ret 78*5d9d9091SRichard Lowe 79*5d9d9091SRichard Lowe .align 4 80*5d9d9091SRichard Lowe.notfound: 81*5d9d9091SRichard Lowe xorl %eax,%eax / search fails 82*5d9d9091SRichard Lowe ret 83*5d9d9091SRichard Lowe SET_SIZE(memccpy) 84