77 lines
2.5 KiB
ArmAsm
77 lines
2.5 KiB
ArmAsm
/* $NetBSD: brk.S,v 1.16 2003/08/07 16:42:17 agc Exp $ */
|
|
|
|
/*-
|
|
* Copyright (c) 1991, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to Berkeley by
|
|
* Ralph Campbell.
|
|
*
|
|
* 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 <machine/asm.h>
|
|
__FBSDID("$FreeBSD$");
|
|
#include "SYS.h"
|
|
|
|
#if defined(LIBC_SCCS) && !defined(lint)
|
|
ASMSTR("from: @(#)brk.s 8.1 (Berkeley) 6/4/93")
|
|
ASMSTR("$NetBSD: brk.S,v 1.16 2003/08/07 16:42:17 agc Exp $")
|
|
#endif /* LIBC_SCCS and not lint */
|
|
|
|
.globl _C_LABEL(minbrk)
|
|
.globl _C_LABEL(curbrk)
|
|
.globl _C_LABEL(_end)
|
|
|
|
.data
|
|
_C_LABEL(minbrk):
|
|
.word _C_LABEL(_end)
|
|
_C_LABEL(curbrk):
|
|
.word _C_LABEL(_end)
|
|
.text
|
|
|
|
LEAF(__sys_brk)
|
|
WEAK_ALIAS(brk, __sys_brk)
|
|
WEAK_ALIAS(_brk, __sys_brk)
|
|
#ifdef __ABICALLS__
|
|
.set noreorder
|
|
.cpload t9
|
|
.set reorder
|
|
#endif
|
|
lw v0, _C_LABEL(minbrk)
|
|
bgeu a0, v0, 1f
|
|
move a0, v0 # dont allow break < minbrk
|
|
1:
|
|
li v0, SYS_break
|
|
syscall
|
|
bne a3, zero, 2f
|
|
sw a0, _C_LABEL(curbrk)
|
|
move v0, zero
|
|
j ra
|
|
2:
|
|
la t9, _C_LABEL(__cerror)
|
|
jr t9
|
|
END(__sys_brk)
|