b6cbf7203b
This patch imports the unmodified current version of NetBSD libc. The NetBSD includes are in /nbsd_include, while the libc code itself is split between lib/nbsd_libc and common/lib/libc.
99 lines
3.1 KiB
ArmAsm
99 lines
3.1 KiB
ArmAsm
/* $NetBSD: brk.S,v 1.15 2008/11/06 13:42:55 nakayama Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 1992, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* This software was developed by the Computer Systems Engineering group
|
|
* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
|
|
* contributed to Berkeley.
|
|
*
|
|
* 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: Header: brk.s,v 1.3 92/06/25 12:56:05 mccanne Exp
|
|
*/
|
|
|
|
#include <machine/asm.h>
|
|
#if defined(SYSLIBC_SCCS) && !defined(lint)
|
|
#if 0
|
|
.asciz "@(#)brk.s 8.1 (Berkeley) 6/4/93"
|
|
#else
|
|
RCSID("$NetBSD: brk.S,v 1.15 2008/11/06 13:42:55 nakayama Exp $")
|
|
#endif
|
|
#endif /* SYSLIBC_SCCS and not lint */
|
|
|
|
#include "SYS.h"
|
|
|
|
.globl CURBRK
|
|
.globl _C_LABEL(__minbrk)
|
|
.globl _end
|
|
|
|
#ifdef WEAK_ALIAS
|
|
WEAK_ALIAS(brk, _brk)
|
|
#endif
|
|
|
|
.data
|
|
_C_LABEL(__minbrk):
|
|
.long _end ! lower brk limit; also for gmon code
|
|
.text
|
|
|
|
ENTRY(_brk)
|
|
#ifdef PIC
|
|
PIC_PROLOGUE(%o5,%o4)
|
|
set _C_LABEL(__minbrk), %o4
|
|
ld [%o5 + %o4], %o4
|
|
ld [%o4], %o1 ! %o1 = minbrk
|
|
cmp %o1, %o0 ! if (minbrk > %o0)
|
|
bgu,a 0f
|
|
mov %o1, %o0 ! %o0 = minbrk
|
|
0:
|
|
mov %o0, %o2 ! save argument to syscall
|
|
mov SYS_break, %g1
|
|
t ST_SYSCALL
|
|
set CURBRK, %o3
|
|
bcc,a 1f
|
|
ld [%o5 + %o3], %o4
|
|
ERROR()
|
|
1:
|
|
retl ! success, return 0 & record new break
|
|
st %o2, [%o4]
|
|
#else
|
|
sethi %hi(_C_LABEL(__minbrk)), %o1 ! %o1 = minbrk
|
|
ld [%o1 + %lo(_C_LABEL(__minbrk))], %o1
|
|
cmp %o1, %o0 ! if (minbrk > %o0)
|
|
bgu,a 0f
|
|
mov %o1, %o0 ! %o0 = minbrk
|
|
0:
|
|
mov %o0, %o2 ! save argument to syscall
|
|
mov SYS_break, %g1
|
|
t ST_SYSCALL
|
|
bcc,a 1f
|
|
sethi %hi(CURBRK), %g1
|
|
ERROR()
|
|
1:
|
|
retl ! success, return 0 & record new break
|
|
st %o2, [%g1 + %lo(CURBRK)]
|
|
#endif
|