sbrk.s revision 7c478bd95313f5f23a4c958a745db2134aa03244
!
! CDDL HEADER START
!
! The contents of this file are subject to the terms of the
! Common Development and Distribution License, Version 1.0 only
! (the "License"). You may not use this file except in compliance
! with the License.
!
! You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
! or http://www.opensolaris.org/os/licensing.
! See the License for the specific language governing permissions
! and limitations under the License.
!
! When distributing Covered Code, include this CDDL HEADER in each
! file and include the License file at usr/src/OPENSOLARIS.LICENSE.
! If applicable, add the following below this CDDL HEADER, with the
! fields enclosed by brackets "[]" replaced with your own identifying
! information: Portions Copyright [yyyy] [name of copyright owner]
!
! CDDL HEADER END
!
! "%Z%%M% %I% %E% SMI"
! Copyright (c) 1986 by Sun Microsystems, Inc.
!
! .seg "text"
.file "sbrk.s"
#include "SYS.h"
#include <sys/syscall.h>
#define ALIGNSIZE 8
.global .curbrk
.type .curbrk,#object
.size .curbrk,4
.global end
.section ".data"
.align 4
.curbrk:
.word end
ENTRY(sbrk)
add %o0, (ALIGNSIZE-1), %o0 ! round up request to align size
andn %o0, (ALIGNSIZE-1), %o0
#ifdef PIC
PIC_SETUP(o5)
ld [%o5 + .curbrk], %g1
ld [%g1], %o3
#else
sethi %hi(.curbrk), %o2
ld [%o2 + %lo(.curbrk)], %o3
#endif
add %o3, (ALIGNSIZE-1), %o3 ! round up .curbrk to align size
andn %o3, (ALIGNSIZE-1), %o3
add %o3, %o0, %o0 ! new break setting = request + .curbrk
mov %o0, %o4 ! save it
mov SYS_brk, %g1
t 8
CERROR(o5)
#ifdef PIC
PIC_SETUP(o5)
ld [%o5 + .curbrk], %g1
st %o4, [%g1]
#else
st %o4, [%o2 + %lo(.curbrk)] ! store new break in .curbrk
#endif
retl
mov %o3, %o0 ! return old break
SET_SIZE(sbrk)