1*ab413216SFrançois Tigeot /* 2*ab413216SFrançois Tigeot * Copyright (c) 2020 François Tigeot <ftigeot@wolfpond.org> 3*ab413216SFrançois Tigeot * All rights reserved. 4*ab413216SFrançois Tigeot * 5*ab413216SFrançois Tigeot * Redistribution and use in source and binary forms, with or without 6*ab413216SFrançois Tigeot * modification, are permitted provided that the following conditions 7*ab413216SFrançois Tigeot * are met: 8*ab413216SFrançois Tigeot * 1. Redistributions of source code must retain the above copyright 9*ab413216SFrançois Tigeot * notice unmodified, this list of conditions, and the following 10*ab413216SFrançois Tigeot * disclaimer. 11*ab413216SFrançois Tigeot * 2. Redistributions in binary form must reproduce the above copyright 12*ab413216SFrançois Tigeot * notice, this list of conditions and the following disclaimer in the 13*ab413216SFrançois Tigeot * documentation and/or other materials provided with the distribution. 14*ab413216SFrançois Tigeot * 15*ab413216SFrançois Tigeot * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16*ab413216SFrançois Tigeot * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17*ab413216SFrançois Tigeot * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18*ab413216SFrançois Tigeot * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19*ab413216SFrançois Tigeot * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20*ab413216SFrançois Tigeot * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21*ab413216SFrançois Tigeot * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22*ab413216SFrançois Tigeot * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23*ab413216SFrançois Tigeot * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24*ab413216SFrançois Tigeot * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25*ab413216SFrançois Tigeot */ 26*ab413216SFrançois Tigeot 27*ab413216SFrançois Tigeot #ifndef _ASM_CMPXCHG_H_ 28*ab413216SFrançois Tigeot #define _ASM_CMPXCHG_H_ 29*ab413216SFrançois Tigeot 30*ab413216SFrançois Tigeot #define xchg(ptr, value) \ 31*ab413216SFrançois Tigeot ({ \ 32*ab413216SFrançois Tigeot __typeof(value) __ret = (value); \ 33*ab413216SFrançois Tigeot \ 34*ab413216SFrançois Tigeot switch (sizeof(value)) { \ 35*ab413216SFrançois Tigeot case 8: \ 36*ab413216SFrançois Tigeot __asm __volatile("xchgq %0, %1" \ 37*ab413216SFrançois Tigeot : "+r" (__ret), "+m" (*(ptr)) \ 38*ab413216SFrançois Tigeot : : "memory"); \ 39*ab413216SFrançois Tigeot break; \ 40*ab413216SFrançois Tigeot case 4: \ 41*ab413216SFrançois Tigeot __asm __volatile("xchgl %0, %1" \ 42*ab413216SFrançois Tigeot : "+r" (__ret), "+m" (*(ptr)) \ 43*ab413216SFrançois Tigeot : : "memory"); \ 44*ab413216SFrançois Tigeot break; \ 45*ab413216SFrançois Tigeot case 2: \ 46*ab413216SFrançois Tigeot __asm __volatile("xchgw %0, %1" \ 47*ab413216SFrançois Tigeot : "+r" (__ret), "+m" (*(ptr)) \ 48*ab413216SFrançois Tigeot : : "memory"); \ 49*ab413216SFrançois Tigeot break; \ 50*ab413216SFrançois Tigeot case 1: \ 51*ab413216SFrançois Tigeot __asm __volatile("xchgb %0, %1" \ 52*ab413216SFrançois Tigeot : "+r" (__ret), "+m" (*(ptr)) \ 53*ab413216SFrançois Tigeot : : "memory"); \ 54*ab413216SFrançois Tigeot break; \ 55*ab413216SFrançois Tigeot default: \ 56*ab413216SFrançois Tigeot panic("xchg(): invalid size %ld\n", sizeof(value)); \ 57*ab413216SFrançois Tigeot } \ 58*ab413216SFrançois Tigeot \ 59*ab413216SFrançois Tigeot __ret; \ 60*ab413216SFrançois Tigeot }) 61*ab413216SFrançois Tigeot 62*ab413216SFrançois Tigeot #endif /* _ASM_CMPXCHG_H_ */ 63