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/* $OpenBSD: srt0.s,v 1.6 1998/05/14 13:50:36 niklas Exp $ */
/* $NetBSD: srt0.s,v 1.9 1997/03/22 12:47:32 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed at Ludd, University of Lule}.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission
*
* 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 */
/*
* 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.
*/
start0: .set start0,0 # passing -e start0 to ld gives OK start addr
.globl start0
_start: .globl _start
nop;nop; # If we get called by calls, or something
movl r8, _memsz # If we come from disk, save memsize
cmpl ap, $-1 # Check if we are net-booted. XXX - kludge
beql 2f # jump if not
ashl $9,76(r11),_memsz # got memsize from rpb
movzbl 102(r11), r10 # Get bootdev from rpb.
movzwl 48(r11), r11 # Get howto
2: movl $_start, sp # Probably safe place for stack
subl2 $52, sp # do not overwrite saved boot-registers
subl3 $_start, $_edata, r0
moval _start, r1
subl3 $_start, $_end, r2
movl $_start, r3
movc5 r0, (r1), $0, r2, (r3)
jsb 1f
1: movl $relocated, (sp) # return-address on top of stack
rsb # can be replaced with new address
relocated: # now relocation is done !!!
movl sp, _bootregs
calls $0, _setup
calls $0, _Xmain # Were here!
halt # no return
.globl _hoppabort
_hoppabort: .word 0x0
movl 4(ap), r6
movl 8(ap), r11
movl 0xc(ap), r10
movl 16(ap), r9
movl _memsz,r8
calls $0,(r6)
.globl _memsz
_memsz: .long 0x0
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