minix/lib/libc/arch/vax/sys/brk.S

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/*
* Copyright (c) 1983, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#if defined(SYSLIBC_SCCS) && !defined(lint)
/* .asciz "@(#)brk.s 8.1 (Berkeley) 6/4/93" */
.asciz "$NetBSD: brk.S,v 1.12 2003/12/26 11:21:48 martin Exp $"
#endif /* SYSLIBC_SCCS and not lint */
#include "SYS.h"
.globl CURBRK
.globl _C_LABEL(__minbrk)
#ifdef WEAK_ALIAS
WEAK_ALIAS(brk, _brk)
#endif
ENTRY(_brk, 0)
cmpl _C_LABEL(__minbrk),4(%ap) # gtr > _end
blequ 1f # is fine
movl _C_LABEL(__minbrk),4(%ap) # shrink back to _end
1: chmk $ SYS_break # do it
jcs err
movl 4(%ap),CURBRK
clrl %r0
ret
err:
jmp CERROR+2