File: [cvs.NetBSD.org] / src / lib / libc / arch / x86_64 / sys / sbrk.S (download)
Revision 1.5, Thu Sep 12 15:36:16 2013 UTC (10 years, 6 months ago) by joerg
Branch: MAIN
CVS Tags: yamt-pagecache-base9, riastradh-xf86-video-intel-2-7-1-pre-2-21-15, riastradh-drm2-base3 Branch point for: tls-earlyentropy
Changes since 1.4: +3 -3
lines
Pass PICFLAGS down to cc-as-as and use __PIC__ to decide if it is small
vs big PIC mode. Retire -DPIC and -DBIGPIC.
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/* $NetBSD: sbrk.S,v 1.5 2013/09/12 15:36:16 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 1.5 2013/09/12 15:36:16 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: .quad _end
.text
ENTRY(_sbrk)
#ifdef __PIC__
movq PIC_GOT(CURBRK),%rdx
movq (%rdx),%rax
test %rdi,%rdi
jz out
addq %rax,%rdi
SYSTRAP(break)
jc err
movq PIC_GOT(CURBRK),%rdx
movq (%rdx),%rax
movq %rdi,(%rdx)
out:
ret
err:
jmp CERROR
#else
movq CURBRK(%rip),%rax
test %rdi,%rdi
jz out
movq %rdi,%rsi
addq %rax,%rdi
SYSTRAP(break)
jc err
movq CURBRK(%rip),%rax
addq %rsi,CURBRK(%rip)
out:
ret
err:
jmp CERROR
#endif