brk.S revision 1.11
11.1Sragge/* 21.1Sragge * Copyright (c) 1983, 1993 31.1Sragge * The Regents of the University of California. All rights reserved. 41.1Sragge * 51.1Sragge * Redistribution and use in source and binary forms, with or without 61.1Sragge * modification, are permitted provided that the following conditions 71.1Sragge * are met: 81.1Sragge * 1. Redistributions of source code must retain the above copyright 91.1Sragge * notice, this list of conditions and the following disclaimer. 101.1Sragge * 2. Redistributions in binary form must reproduce the above copyright 111.1Sragge * notice, this list of conditions and the following disclaimer in the 121.1Sragge * documentation and/or other materials provided with the distribution. 131.11Sagc * 3. Neither the name of the University nor the names of its contributors 141.1Sragge * may be used to endorse or promote products derived from this software 151.1Sragge * without specific prior written permission. 161.1Sragge * 171.1Sragge * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 181.1Sragge * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 191.1Sragge * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 201.1Sragge * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 211.1Sragge * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 221.1Sragge * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 231.1Sragge * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 241.1Sragge * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 251.1Sragge * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 261.1Sragge * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 271.1Sragge * SUCH DAMAGE. 281.1Sragge */ 291.1Sragge 301.1Sragge#if defined(SYSLIBC_SCCS) && !defined(lint) 311.1Sragge /* .asciz "@(#)brk.s 8.1 (Berkeley) 6/4/93" */ 321.11Sagc .asciz "$NetBSD: brk.S,v 1.11 2003/08/07 16:42:33 agc Exp $" 331.1Sragge#endif /* SYSLIBC_SCCS and not lint */ 341.1Sragge 351.1Sragge#include "SYS.h" 361.1Sragge 371.7Smatt .globl CURBRK 381.7Smatt .globl _C_LABEL(__minbrk) 391.1Sragge 401.5Skleink#ifdef WEAK_ALIAS 411.5SkleinkWEAK_ALIAS(brk, _brk) 421.6Skleink#endif 431.8Smatt 441.8SmattENTRY(_brk, 0) 451.10Smatt cmpl 4(%ap),_C_LABEL(__minbrk) # gtr > _end 461.9Smatt bgeq 1f # is fine 471.10Smatt movl _C_LABEL(__minbrk),4(%ap) # shrink back to _end 481.9Smatt1: chmk $ SYS_break # do it 491.1Sragge jcs err 501.10Smatt movl 4(%ap),CURBRK 511.10Smatt clrl %r0 521.1Sragge ret 531.1Sraggeerr: 541.8Smatt jmp CERROR+2 55