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/* $OpenBSD: brk.S,v 1.14 2021/10/25 14:38:10 jca 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.
*/
#include "SYS.h"
.globl _end
.globl __curbrk
.data
__minbrk:
.long _end
END(__minbrk)
.type __minbrk,@object
ENTRY(brk)
#ifdef __PIC__
movl 4(%esp),%ecx
PIC_PROLOGUE
movl PIC_GOT(__minbrk),%edx
PIC_EPILOGUE
cmpl %ecx,(%edx)
jb 1f
movl (%edx),%ecx
movl %ecx,4(%esp)
1:
movl $(SYS_break),%eax
int $0x80
jc 2f
PIC_PROLOGUE
movl PIC_GOT(__curbrk),%edx # set up GOT addressing
PIC_EPILOGUE
xorl %eax,%eax
movl %ecx,(%edx)
#else
movl 4(%esp),%ecx
cmpl %ecx,__minbrk
jb 1f
movl __minbrk,%ecx
movl %ecx,4(%esp)
1:
movl $(SYS_break),%eax
int $0x80
jc 2f
xorl %eax,%eax
movl %ecx,__curbrk
#endif
ret
2:
SET_ERRNO()
ret
END(brk)
.weak brk
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