/* $NetBSD: srt0.S,v 1.6 2018/03/19 15:37:56 ragge Exp $ */
/*
* Copyright (c) 1994 Ludd, University of Lule}, Sweden.
* 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 ``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 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.
*/
/* All bugs are subject to removal without further notice */
#include "../include/asm.h"
/*
* Auto-moving startup code for standalone programs. Can be loaded
* (almost) anywhere in memory but moves itself to the position
* it is linked for. Must be started at first position, recommended
* is phys addr 0 (boot loads programs at 0, but starts them at the
* position set in a.out header.
*/
.globl nisse # pass -e nisse to ld gives OK start addr
.set nisse,0
ALTENTRY(start)
nop;nop;
movl $_C_LABEL(start), %sp # Probably safe place for stack
pushr $0x1fff # save for later usage
subl3 $_C_LABEL(start), $_C_LABEL(edata), %r0
movab _C_LABEL(start), %r1 # get where we are
movl $_C_LABEL(start), %r3 # get where we want to be
cmpl %r1,%r3 # are we where we want to be?
beql relocated # already relocated, skip copy
1: movb (%r1)+,(%r3)+ # copy
sobgtr %r0,1b
subl3 $_C_LABEL(edata), $_C_LABEL(end), %r2
movc5 $0,(%r3),$0,%r2,(%r3) # Zero bss
movpsl -(%sp)
pushl $relocated
rei
relocated: # now relocation is done !!!
movl %sp,_C_LABEL(bootregs) # *bootregs
calls $0, _C_LABEL(Xmain) # Were here!
halt # no return
ENTRY(machdep_start, 0)
calls $0,_C_LABEL(niclose) # Evil hack to shutdown DEBNA.
mtpr $0x1f,$0x12 # Block all interrupts
mtpr $0,$0x18 # stop real time interrupt clock
movl 4(%ap), %r6
movl 20(%ap), %r9 # end of symbol table
pushl 8(%ap) # number of symbols
pushl 16(%ap) # start of symbols
movab _C_LABEL(bootrpb),%r10 # get RPB address
pushl %r10 # argument for new boot
ashl $9,76(%r10),%r8 # memory size (COMPAT)
movl $3,%r11 # ask boot (COMPAT)
clrl %r10 # no boot dev (COMPAT)
