1/* $OpenBSD: brk.S,v 1.8 2015/09/10 13:29:09 guenther Exp $ */ 2/* $NetBSD: brk.S,v 1.4 1996/10/17 03:08:15 cgd Exp $ */ 3 4/* 5 * Copyright (c) 1994, 1995 Carnegie-Mellon University. 6 * All rights reserved. 7 * 8 * Author: Chris G. Demetriou 9 * 10 * Permission to use, copy, modify and distribute this software and 11 * its documentation is hereby granted, provided that both the copyright 12 * notice and this permission notice appear in all copies of the 13 * software, derivative works or modified versions, and any portions 14 * thereof, and that both notices appear in supporting documentation. 15 * 16 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 17 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND 18 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 19 * 20 * Carnegie Mellon requests users of this software to return to 21 * 22 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU 23 * School of Computer Science 24 * Carnegie Mellon University 25 * Pittsburgh PA 15213-3890 26 * 27 * any improvements or extensions that they make and grant Carnegie the 28 * rights to redistribute these changes. 29 */ 30 31#include "SYS.h" 32 33 .globl _end 34IMPORT(__curbrk, 8) 35 36 .data 37__minbrk: 38 .quad _end 39 .size __minbrk, . - __minbrk 40 .type __minbrk,@object 41 42 .text 43 .weak brk 44LEAF(brk, 1) 45 br pv, L1 /* XXX profiling */ 46L1: LDGP(pv) 47 ldq v0, __minbrk 48 cmpult a0, v0, t0 49 cmovne t0, v0, a0 50 CALLSYS_ERROR(break) 51 stq a0, __curbrk 52 mov zero, v0 53 RET 54END(brk) 55