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