92 lines
3.0 KiB
ArmAsm
92 lines
3.0 KiB
ArmAsm
/* $NetBSD: srt0.s,v 1.3 1995/08/29 21:55:51 phil Exp $ */
|
|
|
|
/*-
|
|
* Copyright (c) 1994 Philip L. Budne.
|
|
* 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.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by Philip L. Budne.
|
|
* 4. The name of Philip L. Budne may not be used to endorse or promote
|
|
* products derived from this software without specific prior written
|
|
* permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY PHILIP NELSON ``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 PHILIP NELSON 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.
|
|
*/
|
|
|
|
/*
|
|
* srt0.s -- standalone C startup
|
|
* Phil Budne, May 10, 1994
|
|
*
|
|
* from: pc532 kernel locore.s
|
|
* Phil Nelson, Dec 6, 1992
|
|
*
|
|
*/
|
|
|
|
#define PSR_S 0x200
|
|
#define PSR_I 0x800
|
|
|
|
.data
|
|
.globl _howto, _bootdev, _r3, _r6, _r7
|
|
__save_sp: .long 0
|
|
__save_fp: .long 0
|
|
_bootdev: .long 0
|
|
_howto: .long 0
|
|
_r3: .long 0
|
|
_r6: .long 0
|
|
_r7: .long 0
|
|
|
|
.text
|
|
.globl begin
|
|
begin:
|
|
bicpsrw PSR_I /* make sure interrupts are off. */
|
|
bicpsrw PSR_S /* make sure we are using sp0. */
|
|
|
|
/* In case we are zboot: */
|
|
movd r3,_r3(pc) /* magic */
|
|
movd r6,_r6(pc) /* devtype */
|
|
movd r7,_r7(pc) /* howto */
|
|
|
|
lprd sb, 0 /* gcc expects this. */
|
|
sprd sp, __save_sp(pc) /* save monitor's sp. */
|
|
sprd fp, __save_fp(pc) /* save monitor's fp. */
|
|
/* sprd intbase, __old_intbase(pc) /* save monitor's intbase. */
|
|
movqd 0, _howto(pc)
|
|
|
|
restart:
|
|
/* Zero the bss segment. */
|
|
addr _end(pc),r0 # setup to zero the bss segment.
|
|
addr _edata(pc),r1
|
|
subd r1,r0 # compute _end - _edata
|
|
movd r0,tos # push length
|
|
addr _edata(pc),tos # push address
|
|
|
|
movqd 0,_bootdev(pc) # XXX trash bootdev
|
|
bsr _bzero # zero the bss segment
|
|
bsr _main
|
|
/* fall */
|
|
|
|
.globl __rtt
|
|
__rtt: lprd sp, __save_sp(pc) /* restore monitor's sp. */
|
|
lprd fp, __save_fp(pc) /* restore monitor's fp. */
|
|
/* XXX just return to monitor??? */
|
|
movqd 3, _howto /* RB_SINGLE|RB_ASKNAME */
|
|
br restart
|