71 lines
2.1 KiB
ArmAsm
71 lines
2.1 KiB
ArmAsm
|
/*-
|
||
|
|
* Copyright (c) 2002 Peter Grehan.
|
||
|
|
* All rights reserved.
|
||
|
|
*
|
||
|
|
* 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.
|
||
|
|
*
|
||
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
|
||
|
|
*/
|
||
|
|
/* $NetBSD: sbrk.S,v 1.8 2000/06/26 06:25:44 kleink Exp $ */
|
||
|
|
|
||
|
|
#include <machine/asm.h>
|
||
|
|
__FBSDID("$FreeBSD$");
|
||
|
|
|
||
|
|
#include "SYS.h"
|
||
|
|
|
||
|
|
.globl HIDENAME(curbrk)
|
||
|
|
.globl CNAME(_end)
|
||
|
|
|
||
|
|
.data
|
||
|
|
HIDENAME(curbrk):
|
||
|
|
.long CNAME(_end)
|
||
|
|
|
||
|
|
.text
|
||
|
|
ENTRY(sbrk)
|
||
|
|
|
||
|
|
#ifdef PIC
|
||
|
|
mflr %r10
|
||
|
|
bl _GLOBAL_OFFSET_TABLE_@local-4
|
||
|
|
mflr %r5
|
||
|
|
mtlr %r10
|
||
|
|
lwz %r5,HIDENAME(curbrk)@got(%r5)
|
||
|
|
lwz %r6,0(%r5)
|
||
|
|
#else
|
||
|
|
lis %r5,HIDENAME(curbrk)@ha
|
||
|
|
lwz %r6,HIDENAME(curbrk)@l(%r5) /* r6 = old break */
|
||
|
|
#endif
|
||
|
|
cmpwi %r3,0 /* sbrk(0) - return curbrk */
|
||
|
|
beq 1f
|
||
|
|
add %r3,%r3,%r6
|
||
|
|
mr %r7,%r3 /* r7 = new break */
|
||
|
|
li %r0,SYS_break
|
||
|
|
sc /* break(new_break) */
|
||
|
|
bso 2f
|
||
|
|
#ifdef PIC
|
||
|
|
stw %r7,0(%r5)
|
||
|
|
#else
|
||
|
|
stw %r7,HIDENAME(curbrk)@l(%r5) /* record new break */
|
||
|
|
#endif
|
||
|
|
1:
|
||
|
|
mr %r3,%r6 /* set return value */
|
||
|
|
blr
|
||
|
|
2:
|
||
|
|
b PIC_PLT(HIDENAME(cerror))
|