sbrk.S revision 5790 
122347Spst/*-
222347Spst * Copyright (c) 1990 The Regents of the University of California.
322347Spst * All rights reserved.
422347Spst *
522347Spst * This code is derived from software contributed to Berkeley by
622347Spst * William Jolitz.
722347Spst *
822347Spst * Redistribution and use in source and binary forms, with or without
922347Spst * modification, are permitted provided that the following conditions
1022347Spst * are met:
1122347Spst * 1. Redistributions of source code must retain the above copyright
1222347Spst *    notice, this list of conditions and the following disclaimer.
1322347Spst * 2. Redistributions in binary form must reproduce the above copyright
1422347Spst *    notice, this list of conditions and the following disclaimer in the
1522347Spst *    documentation and/or other materials provided with the distribution.
1622347Spst * 3. All advertising materials mentioning features or use of this software
1722347Spst *    must display the following acknowledgement:
1822347Spst *	This product includes software developed by the University of
1922347Spst *	California, Berkeley and its contributors.
2022347Spst * 4. Neither the name of the University nor the names of its contributors
2122347Spst *    may be used to endorse or promote products derived from this software
2222347Spst *    without specific prior written permission.
2322347Spst *
2422347Spst * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
2522347Spst * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
2622347Spst * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
2722347Spst * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
2822347Spst * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
2922347Spst * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
3022347Spst * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
3122347Spst * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
3222347Spst * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
3322347Spst * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
3422347Spst * SUCH DAMAGE.
3522347Spst *
3622347Spst *	$Id: sbrk.S,v 1.1 1994/08/05 01:18:49 wollman Exp $
3722347Spst */
3822347Spst
3922347Spst#if defined(SYSLIBC_RCS) && !defined(lint)
4022347Spst	.text
4122347Spst	.asciz "$Id$"
4222347Spst#endif /* SYSLIBC_RCS and not lint */
4322347Spst
4422347Spst#include "SYS.h"
4522347Spst
4622347Spst#define	SYS_brk		17
4722347Spst
4822347Spst	.globl	_end
4922347Spst	.globl	minbrk
5022347Spst	.globl	curbrk
5122347Spst
5222347Spst	.data
5322347Spstminbrk:	.long	_end
5422347Spstcurbrk:	.long	_end
5522347Spst	.text
5622347Spst
5722347SpstENTRY(sbrk)
5822347Spst#ifdef PIC
5922347Spst	movl	4(%esp),%ecx
6022347Spst	PIC_PROLOGUE
6122347Spst	movl	PIC_GOT(curbrk),%edx
6222347Spst	movl	(%edx),%eax
6322347Spst	PIC_EPILOGUE
6422347Spst	addl	%eax,4(%esp)
6522347Spst	lea	SYS_brk,%eax
6622347Spst	LCALL(7,0)
6722347Spst	jb	err
6822347Spst	PIC_PROLOGUE
69	movl	PIC_GOT(curbrk),%edx
70	movl	(%edx),%eax
71	addl	%ecx,(%edx)
72	PIC_EPILOGUE
73	ret
74err:
75	jmp	PIC_PLT(cerror)
76
77#else
78
79	movl	4(%esp),%ecx
80	movl	curbrk,%eax
81	addl	%eax,4(%esp)
82	lea	SYS_brk,%eax
83	LCALL(7,0)
84	jb	err
85	movl	curbrk,%eax
86	addl	%ecx,curbrk
87	ret
88err:
89	jmp	cerror
90#endif
91