31582c4e81
assumes that the parameters are passed in output registers. Remove the alloc entirely, but don't depend on the kernel not trashing our registers.
59 lines
1.5 KiB
ArmAsm
59 lines
1.5 KiB
ArmAsm
/* $FreeBSD$ */
|
|
/* $NetBSD: sbrk.S,v 1.4 1996/10/17 03:08:20 cgd Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 1994, 1995 Carnegie-Mellon University.
|
|
* All rights reserved.
|
|
*
|
|
* Author: Chris G. Demetriou
|
|
*
|
|
* Permission to use, copy, modify and distribute this software and
|
|
* its documentation is hereby granted, provided that both the copyright
|
|
* notice and this permission notice appear in all copies of the
|
|
* software, derivative works or modified versions, and any portions
|
|
* thereof, and that both notices appear in supporting documentation.
|
|
*
|
|
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
|
|
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
|
|
* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
|
|
*
|
|
* Carnegie Mellon requests users of this software to return to
|
|
*
|
|
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
|
|
* School of Computer Science
|
|
* Carnegie Mellon University
|
|
* Pittsburgh PA 15213-3890
|
|
*
|
|
* any improvements or extensions that they make and grant Carnegie the
|
|
* rights to redistribute these changes.
|
|
*/
|
|
|
|
#include "SYS.h"
|
|
|
|
.globl _end
|
|
|
|
.data
|
|
EXPORT(curbrk)
|
|
.quad _end
|
|
|
|
.text
|
|
ENTRY(sbrk, 1)
|
|
add r14 = @ltoff(curbrk), gp
|
|
;;
|
|
ld8 r14 = [r14]
|
|
cmp.eq p6, p0 = in0, r0
|
|
;;
|
|
ld8 ret0 = [r14]
|
|
(p6) br.ret.sptk.few rp
|
|
;;
|
|
add in0 = ret0, in0
|
|
CALLSYS_ERROR(break)
|
|
add r14 = @ltoff(curbrk), gp
|
|
;;
|
|
ld8 r14 = [r14]
|
|
;;
|
|
ld8 ret0 = [r14]
|
|
st8 [r14] = in0
|
|
br.ret.sptk.few rp
|
|
END(sbrk)
|