85 lines
3.3 KiB
ArmAsm
85 lines
3.3 KiB
ArmAsm
/* $NetBSD: srt0.S,v 1.2 2002/03/31 00:11:14 matt Exp $ */
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/*
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* Copyright (c) 1994 Ludd, University of Lule}, Sweden.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed at Ludd, University of Lule}.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/* All bugs are subject to removal without further notice */
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#include "../include/asm.h"
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/*
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* Auto-moving startup code for standalone programs. Can be loaded
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* (almost) anywhere in memory but moves itself to the position
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* it is linked for. Must be started at first position, recommended
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* is phys addr 0 (boot loads programs at 0, but starts them at the
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* position set in a.out header.
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*/
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.globl nisse # pass -e nisse to ld gives OK start addr
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.set nisse,0
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ALTENTRY(start)
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nop;nop;
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movl $_C_LABEL(start), %sp # Probably safe place for stack
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pushr $0x1fff # save for later usage
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subl3 $_C_LABEL(start), $_C_LABEL(edata), %r0
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movab _C_LABEL(start), %r1 # get where we are
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movl $_C_LABEL(start), %r3 # get where we want to be
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cmpl %r1,%r3 # are we where we want to be?
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beql relocated # already relocated, skip copy
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movc3 %r0,(%r1),(%r3) # copy
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subl3 $_C_LABEL(edata), $_C_LABEL(end), %r2
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movc5 $0,(%r3),$0,%r2,(%r3) # Zero bss
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movpsl -(%sp)
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pushl $relocated
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rei
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relocated: # now relocation is done !!!
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movl %sp,_C_LABEL(bootregs) # *bootregs
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calls $0, _C_LABEL(Xmain) # Were here!
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halt # no return
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ENTRY(machdep_start, 0)
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calls $0,_C_LABEL(niclose) # Evil hack to shutdown DEBNA.
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mtpr $0x1f,$0x12 # Block all interrupts
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mtpr $0,$0x18 # stop real time interrupt clock
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movl 4(%ap), %r6
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movl 20(%ap), %r9 # end of symbol table
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pushl 8(%ap) # number of symbols
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pushl 16(%ap) # start of symbols
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movab _C_LABEL(bootrpb),%r10 # get RPB address
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pushl %r10 # argument for new boot
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ashl $9,76(%r10),%r8 # memory size (COMPAT)
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movl $3,%r11 # ask boot (COMPAT)
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clrl %r10 # no boot dev (COMPAT)
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calls $3,(%r6)
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halt
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