Annotation of sys/arch/vax/boot/common/srt0.S, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: srt0.S,v 1.1 2002/06/11 09:36:24 hugh Exp $ */
2: /* $NetBSD: srt0.S,v 1.2 2002/03/31 00:11:14 matt Exp $ */
3: /*
4: * Copyright (c) 1994 Ludd, University of Lule}, Sweden.
5: * All rights reserved.
6: *
7: * Redistribution and use in source and binary forms, with or without
8: * modification, are permitted provided that the following conditions
9: * are met:
10: * 1. Redistributions of source code must retain the above copyright
11: * notice, this list of conditions and the following disclaimer.
12: * 2. Redistributions in binary form must reproduce the above copyright
13: * notice, this list of conditions and the following disclaimer in the
14: * documentation and/or other materials provided with the distribution.
15: * 3. All advertising materials mentioning features or use of this software
16: * must display the following acknowledgement:
17: * This product includes software developed at Ludd, University of Lule}.
18: * 4. The name of the author may not be used to endorse or promote products
19: * derived from this software without specific prior written permission
20: *
21: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
22: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
23: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
24: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
25: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
26: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
28: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
30: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31: */
32:
33: /* All bugs are subject to removal without further notice */
34:
35: #include "../include/asm.h"
36:
37: /*
38: * Auto-moving startup code for standalone programs. Can be loaded
39: * (almost) anywhere in memory but moves itself to the position
40: * it is linked for. Must be started at first position, recommended
41: * is phys addr 0 (boot loads programs at 0, but starts them at the
42: * position set in a.out header.
43: */
44:
45: .globl nisse # pass -e nisse to ld gives OK start addr
46: .set nisse,0
47:
48: ALTENTRY(start)
49: nop;nop;
50: movl $_C_LABEL(start), sp # Probably safe place for stack
51: pushr $0x1fff # save for later usage
52:
53: subl3 $_C_LABEL(start), $_C_LABEL(edata), r0
54: movab _C_LABEL(start), r1 # get where we are
55: movl $_C_LABEL(start), r3 # get where we want to be
56: cmpl r1,r3 # are we where we want to be?
57: beql relocated # already relocated, skip copy
58: movc3 r0,(r1),(r3) # copy
59: subl3 $_C_LABEL(edata), $_C_LABEL(end), r2
60: movc5 $0,(r3),$0,r2,(r3) # Zero bss
61:
62: movpsl -(sp)
63: pushl $relocated
64: rei
65: relocated: # now relocation is done !!!
66: movl sp,_C_LABEL(bootregs) # *bootregs
67: calls $0, _C_LABEL(Xmain) # Were here!
68: halt # no return
69:
70: ENTRY(machdep_start, 0)
71: calls $0,_C_LABEL(niclose) # Evil hack to shutdown DEBNA.
72: mtpr $0x1f,$0x12 # Block all interrupts
73: mtpr $0,$0x18 # stop real time interrupt clock
74: movl 4(ap), r6
75: movl 20(ap), r9 # end of symbol table
76: pushl 8(ap) # number of symbols
77: pushl 16(ap) # start of symbols
78: movab _C_LABEL(bootrpb),r10 # get RPB address
79: pushl r10 # argument for new boot
80: ashl $9,76(r10),r8 # memory size (COMPAT)
81: movl $3,r11 # ask boot (COMPAT)
82: clrl r10 # no boot dev (COMPAT)
83:
84: calls $3,(r6)
85: halt
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