1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
|
/* $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
|
