minix/lib/libc/arch/i386/sys/sbrk.S

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/* $NetBSD: sbrk.S,v 1.20 2011/11/18 20:21:41 joerg Exp $ */
/*-
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* William Jolitz.
*
* 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.
*
* from: @(#)sbrk.s 5.1 (Berkeley) 4/23/90
*/
#include <machine/asm.h>
#if defined(SYSLIBC_SCCS) && !defined(lint)
RCSID("$NetBSD: sbrk.S,v 1.20 2011/11/18 20:21:41 joerg Exp $")
#endif /* SYSLIBC_SCCS and not lint */
#include "SYS.h"
.globl _end
.globl CURBRK
#ifdef WEAK_ALIAS
WEAK_ALIAS(sbrk, _sbrk)
#endif
.data
CURBRK: .long _end
.text
ENTRY(_sbrk)
#ifdef PIC
movl 4(%esp),%ecx
PIC_PROLOGUE
movl PIC_GOT(CURBRK),%edx
PIC_EPILOGUE
movl (%edx),%eax
test %ecx,%ecx
jz out
addl %eax,%ecx
movl %ecx,4(%esp)
OSYSTRAP(break) /* don't clobber %ecx */
jc err
PIC_PROLOGUE
movl PIC_GOT(CURBRK),%edx
PIC_EPILOGUE
movl (%edx),%eax
movl %ecx,(%edx)
out:
ret
err:
jmp CERROR
#else
movl 4(%esp),%ecx
movl CURBRK,%eax
test %ecx,%ecx
jz out
addl %eax,4(%esp)
OSYSTRAP(break) /* don't clobber %ecx */
jc err
movl CURBRK,%eax
addl %ecx,CURBRK
out:
ret
err:
jmp CERROR
#endif