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/* $OpenBSD: sbrk.S,v 1.3 2006/05/09 22:52:13 drahn Exp $ */
/* $NetBSD: sbrk.S,v 1.1 2001/06/19 00:25:06 fvdl 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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>
#include "SYS.h"
.globl _end
.globl __curbrk
#ifdef WEAK_ALIAS
WEAK_ALIAS(sbrk, _sbrk)
#endif
.data
__curbrk: .quad _end
.text
SYSENTRY(_sbrk)
#ifdef PIC
movq PIC_GOT(__curbrk),%rdx
movslq %edi, %rax
movq (%rdx),%rdi
addq %rax,%rdi
SYSTRAP(break)
jc err
movq PIC_GOT(__curbrk),%rdx
movq (%rdx),%rax
movq %rdi,(%rdx)
ret
err:
mov PIC_GOT(CERROR),%rdx
jmp *%rdx
#else
movq __curbrk(%rip),%rax
movslq %edi,%rsi
movq %rsi,%rdi
addq %rax,%rdi
SYSTRAP(break)
jc err
movq __curbrk(%rip),%rax
addq %rsi,__curbrk(%rip)
ret
err:
jmp CERROR
#endif
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