1*4882a593Smuzhiyun /* 2*4882a593Smuzhiyun * Copyright (C) 2011 Tobias Klauser <tklauser@distanz.ch> 3*4882a593Smuzhiyun * Copyright (C) 2004 Microtronix Datacom Ltd 4*4882a593Smuzhiyun * 5*4882a593Smuzhiyun * This file is subject to the terms and conditions of the GNU General Public 6*4882a593Smuzhiyun * License. See the file "COPYING" in the main directory of this archive 7*4882a593Smuzhiyun * for more details. 8*4882a593Smuzhiyun */ 9*4882a593Smuzhiyun 10*4882a593Smuzhiyun #include <linux/types.h> 11*4882a593Smuzhiyun #include <linux/string.h> 12*4882a593Smuzhiyun memmove(void * d,const void * s,size_t count)13*4882a593Smuzhiyunvoid *memmove(void *d, const void *s, size_t count) 14*4882a593Smuzhiyun { 15*4882a593Smuzhiyun unsigned long dst, src; 16*4882a593Smuzhiyun 17*4882a593Smuzhiyun if (!count) 18*4882a593Smuzhiyun return d; 19*4882a593Smuzhiyun 20*4882a593Smuzhiyun if (d < s) { 21*4882a593Smuzhiyun dst = (unsigned long) d; 22*4882a593Smuzhiyun src = (unsigned long) s; 23*4882a593Smuzhiyun 24*4882a593Smuzhiyun if ((count < 8) || ((dst ^ src) & 3)) 25*4882a593Smuzhiyun goto restup; 26*4882a593Smuzhiyun 27*4882a593Smuzhiyun if (dst & 1) { 28*4882a593Smuzhiyun *(char *)dst++ = *(char *)src++; 29*4882a593Smuzhiyun count--; 30*4882a593Smuzhiyun } 31*4882a593Smuzhiyun if (dst & 2) { 32*4882a593Smuzhiyun *(short *)dst = *(short *)src; 33*4882a593Smuzhiyun src += 2; 34*4882a593Smuzhiyun dst += 2; 35*4882a593Smuzhiyun count -= 2; 36*4882a593Smuzhiyun } 37*4882a593Smuzhiyun while (count > 3) { 38*4882a593Smuzhiyun *(long *)dst = *(long *)src; 39*4882a593Smuzhiyun src += 4; 40*4882a593Smuzhiyun dst += 4; 41*4882a593Smuzhiyun count -= 4; 42*4882a593Smuzhiyun } 43*4882a593Smuzhiyun restup: 44*4882a593Smuzhiyun while (count--) 45*4882a593Smuzhiyun *(char *)dst++ = *(char *)src++; 46*4882a593Smuzhiyun } else { 47*4882a593Smuzhiyun dst = (unsigned long) d + count; 48*4882a593Smuzhiyun src = (unsigned long) s + count; 49*4882a593Smuzhiyun 50*4882a593Smuzhiyun if ((count < 8) || ((dst ^ src) & 3)) 51*4882a593Smuzhiyun goto restdown; 52*4882a593Smuzhiyun 53*4882a593Smuzhiyun if (dst & 1) { 54*4882a593Smuzhiyun src--; 55*4882a593Smuzhiyun dst--; 56*4882a593Smuzhiyun count--; 57*4882a593Smuzhiyun *(char *)dst = *(char *)src; 58*4882a593Smuzhiyun } 59*4882a593Smuzhiyun if (dst & 2) { 60*4882a593Smuzhiyun src -= 2; 61*4882a593Smuzhiyun dst -= 2; 62*4882a593Smuzhiyun count -= 2; 63*4882a593Smuzhiyun *(short *)dst = *(short *)src; 64*4882a593Smuzhiyun } 65*4882a593Smuzhiyun while (count > 3) { 66*4882a593Smuzhiyun src -= 4; 67*4882a593Smuzhiyun dst -= 4; 68*4882a593Smuzhiyun count -= 4; 69*4882a593Smuzhiyun *(long *)dst = *(long *)src; 70*4882a593Smuzhiyun } 71*4882a593Smuzhiyun restdown: 72*4882a593Smuzhiyun while (count--) { 73*4882a593Smuzhiyun src--; 74*4882a593Smuzhiyun dst--; 75*4882a593Smuzhiyun *(char *)dst = *(char *)src; 76*4882a593Smuzhiyun } 77*4882a593Smuzhiyun } 78*4882a593Smuzhiyun 79*4882a593Smuzhiyun return d; 80*4882a593Smuzhiyun } 81