brk.S revision 1.14
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 301.13Smatt#include "SYS.h" 311.13Smatt 321.1Sragge#if defined(SYSLIBC_SCCS) && !defined(lint) 331.1Sragge /* .asciz "@(#)brk.s 8.1 (Berkeley) 6/4/93" */ 341.14SmattRCSID("$NetBSD: brk.S,v 1.14 2013/07/18 12:27:01 matt Exp $") 351.1Sragge#endif /* SYSLIBC_SCCS and not lint */ 361.1Sragge 371.14Smatt .globl _C_LABEL(__curbrk) 381.7Smatt .globl _C_LABEL(__minbrk) 391.14Smatt .hidden _C_LABEL(__curbrk) 401.14Smatt .hidden _C_LABEL(__minbrk) 411.1Sragge 421.5Skleink#ifdef WEAK_ALIAS 431.5SkleinkWEAK_ALIAS(brk, _brk) 441.6Skleink#endif 451.8Smatt 461.8SmattENTRY(_brk, 0) 471.14Smatt moval _C_LABEL(__minbrk),%r5 # gtr > _end 481.14Smatt cmpl (%r5),4(%ap) # gtr > _end 491.12Smartin blequ 1f # is fine 501.14Smatt movl (%r5),4(%ap) # shrink back to _end 511.9Smatt1: chmk $ SYS_break # do it 521.1Sragge jcs err 531.14Smatt movl 4(%ap),_C_LABEL(__curbrk) 541.10Smatt clrl %r0 551.1Sragge ret 561.1Sraggeerr: 571.8Smatt jmp CERROR+2 581.13SmattEND(_brk) 59