1*0Sstevel@tonic-gate/* 2*0Sstevel@tonic-gate * Copyright 2004 Sun Microsystems, Inc. All rights reserved. 3*0Sstevel@tonic-gate * Use is subject to license terms. 4*0Sstevel@tonic-gate */ 5*0Sstevel@tonic-gate 6*0Sstevel@tonic-gate#pragma ident "%Z%%M% %I% %E% SMI" 7*0Sstevel@tonic-gate 8*0Sstevel@tonic-gate/*- 9*0Sstevel@tonic-gate * Copyright (c) 1993 The Regents of the University of California. 10*0Sstevel@tonic-gate * All rights reserved. 11*0Sstevel@tonic-gate * 12*0Sstevel@tonic-gate * Redistribution and use in source and binary forms, with or without 13*0Sstevel@tonic-gate * modification, are permitted provided that the following conditions 14*0Sstevel@tonic-gate * are met: 15*0Sstevel@tonic-gate * 1. Redistributions of source code must retain the above copyright 16*0Sstevel@tonic-gate * notice, this list of conditions and the following disclaimer. 17*0Sstevel@tonic-gate * 2. Redistributions in binary form must reproduce the above copyright 18*0Sstevel@tonic-gate * notice, this list of conditions and the following disclaimer in the 19*0Sstevel@tonic-gate * documentation and/or other materials provided with the distribution. 20*0Sstevel@tonic-gate * 3. All advertising materials mentioning features or use of this software 21*0Sstevel@tonic-gate * must display the following acknowledgement: 22*0Sstevel@tonic-gate * This product includes software developed by the University of 23*0Sstevel@tonic-gate * California, Berkeley and its contributors. 24*0Sstevel@tonic-gate * 4. Neither the name of the University nor the names of its contributors 25*0Sstevel@tonic-gate * may be used to endorse or promote products derived from this software 26*0Sstevel@tonic-gate * without specific prior written permission. 27*0Sstevel@tonic-gate * 28*0Sstevel@tonic-gate * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 29*0Sstevel@tonic-gate * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 30*0Sstevel@tonic-gate * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 31*0Sstevel@tonic-gate * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 32*0Sstevel@tonic-gate * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 33*0Sstevel@tonic-gate * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 34*0Sstevel@tonic-gate * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 35*0Sstevel@tonic-gate * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 36*0Sstevel@tonic-gate * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 37*0Sstevel@tonic-gate * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 38*0Sstevel@tonic-gate * SUCH DAMAGE. 39*0Sstevel@tonic-gate * 40*0Sstevel@tonic-gate * $FreeBSD: src/sys/amd64/amd64/support.S,v 1.102 2003/10/02 05:08:13 alc Exp $ 41*0Sstevel@tonic-gate */ 42*0Sstevel@tonic-gate 43*0Sstevel@tonic-gate#include <sys/asm_linkage.h> 44*0Sstevel@tonic-gate 45*0Sstevel@tonic-gate#if defined(__lint) 46*0Sstevel@tonic-gate 47*0Sstevel@tonic-gate/* 48*0Sstevel@tonic-gate * Overlapping bcopy (source and target may overlap arbitrarily). 49*0Sstevel@tonic-gate */ 50*0Sstevel@tonic-gate/* ARGSUSED */ 51*0Sstevel@tonic-gatevoid 52*0Sstevel@tonic-gateovbcopy(const void *from, void *to, size_t count) 53*0Sstevel@tonic-gate{} 54*0Sstevel@tonic-gate 55*0Sstevel@tonic-gate#else /* __lint */ 56*0Sstevel@tonic-gate 57*0Sstevel@tonic-gate/* 58*0Sstevel@tonic-gate * Adapted from fbsd bcopy(). 59*0Sstevel@tonic-gate * 60*0Sstevel@tonic-gate * bcopy(src, dst, cnt) 61*0Sstevel@tonic-gate * rdi, rsi, rdx 62*0Sstevel@tonic-gate * ws@tools.de (Wolfgang Solfrank, TooLs GmbH) +49-228-985800 63*0Sstevel@tonic-gate */ 64*0Sstevel@tonic-gate 65*0Sstevel@tonic-gate#if defined(__amd64) 66*0Sstevel@tonic-gate 67*0Sstevel@tonic-gate ENTRY(ovbcopy) 68*0Sstevel@tonic-gate xchgq %rsi,%rdi 69*0Sstevel@tonic-gate movq %rdx,%rcx 70*0Sstevel@tonic-gate 71*0Sstevel@tonic-gate movq %rdi,%rax 72*0Sstevel@tonic-gate subq %rsi,%rax 73*0Sstevel@tonic-gate cmpq %rcx,%rax /* overlapping && src < dst? */ 74*0Sstevel@tonic-gate jb reverse 75*0Sstevel@tonic-gate 76*0Sstevel@tonic-gate shrq $3,%rcx /* copy by 64-bit words */ 77*0Sstevel@tonic-gate cld /* nope, copy forwards */ 78*0Sstevel@tonic-gate rep 79*0Sstevel@tonic-gate movsq 80*0Sstevel@tonic-gate movq %rdx,%rcx 81*0Sstevel@tonic-gate andq $7,%rcx /* any bytes left? */ 82*0Sstevel@tonic-gate rep 83*0Sstevel@tonic-gate movsb 84*0Sstevel@tonic-gate ret 85*0Sstevel@tonic-gate 86*0Sstevel@tonic-gatereverse: 87*0Sstevel@tonic-gate addq %rcx,%rdi /* copy backwards */ 88*0Sstevel@tonic-gate addq %rcx,%rsi 89*0Sstevel@tonic-gate decq %rdi 90*0Sstevel@tonic-gate decq %rsi 91*0Sstevel@tonic-gate andq $7,%rcx /* any fractional bytes? */ 92*0Sstevel@tonic-gate std 93*0Sstevel@tonic-gate rep 94*0Sstevel@tonic-gate movsb 95*0Sstevel@tonic-gate movq %rdx,%rcx /* copy remainder by 32-bit words */ 96*0Sstevel@tonic-gate shrq $3,%rcx 97*0Sstevel@tonic-gate subq $7,%rsi 98*0Sstevel@tonic-gate subq $7,%rdi 99*0Sstevel@tonic-gate rep 100*0Sstevel@tonic-gate movsq 101*0Sstevel@tonic-gate cld 102*0Sstevel@tonic-gate ret 103*0Sstevel@tonic-gate SET_SIZE(ovbcopy) 104*0Sstevel@tonic-gate 105*0Sstevel@tonic-gate#elif defined(__i386) 106*0Sstevel@tonic-gate 107*0Sstevel@tonic-gate ENTRY(ovbcopy) 108*0Sstevel@tonic-gate pushl %esi 109*0Sstevel@tonic-gate pushl %edi 110*0Sstevel@tonic-gate movl 12(%esp),%esi 111*0Sstevel@tonic-gate movl 16(%esp),%edi 112*0Sstevel@tonic-gate movl 20(%esp),%ecx 113*0Sstevel@tonic-gate 114*0Sstevel@tonic-gate movl %edi,%eax 115*0Sstevel@tonic-gate subl %esi,%eax 116*0Sstevel@tonic-gate cmpl %ecx,%eax /* overlapping && src < dst? */ 117*0Sstevel@tonic-gate jb reverse 118*0Sstevel@tonic-gate 119*0Sstevel@tonic-gate shrl $2,%ecx /* copy by 32-bit words */ 120*0Sstevel@tonic-gate cld /* nope, copy forwards */ 121*0Sstevel@tonic-gate rep 122*0Sstevel@tonic-gate movsl 123*0Sstevel@tonic-gate movl 20(%esp),%ecx 124*0Sstevel@tonic-gate andl $3,%ecx /* any bytes left? */ 125*0Sstevel@tonic-gate rep 126*0Sstevel@tonic-gate movsb 127*0Sstevel@tonic-gate popl %edi 128*0Sstevel@tonic-gate popl %esi 129*0Sstevel@tonic-gate ret 130*0Sstevel@tonic-gate 131*0Sstevel@tonic-gatereverse: 132*0Sstevel@tonic-gate addl %ecx,%edi /* copy backwards */ 133*0Sstevel@tonic-gate addl %ecx,%esi 134*0Sstevel@tonic-gate decl %edi 135*0Sstevel@tonic-gate decl %esi 136*0Sstevel@tonic-gate andl $3,%ecx /* any fractional bytes? */ 137*0Sstevel@tonic-gate std 138*0Sstevel@tonic-gate rep 139*0Sstevel@tonic-gate movsb 140*0Sstevel@tonic-gate movl 20(%esp),%ecx /* copy remainder by 32-bit words */ 141*0Sstevel@tonic-gate shrl $2,%ecx 142*0Sstevel@tonic-gate subl $3,%esi 143*0Sstevel@tonic-gate subl $3,%edi 144*0Sstevel@tonic-gate rep 145*0Sstevel@tonic-gate movsl 146*0Sstevel@tonic-gate popl %edi 147*0Sstevel@tonic-gate popl %esi 148*0Sstevel@tonic-gate cld 149*0Sstevel@tonic-gate ret 150*0Sstevel@tonic-gate SET_SIZE(ovbcopy) 151*0Sstevel@tonic-gate 152*0Sstevel@tonic-gate#endif /* __i386 */ 153*0Sstevel@tonic-gate 154*0Sstevel@tonic-gate#endif /* __lint */ 155