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
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
|
/*
FreeRTOS MCF5235 port - Copyright (C) 2006 Christian Walter.
This file is part of the FreeRTOS distribution.
FreeRTOS is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License** as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
FreeRTOS is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with FreeRTOS; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
A special exception to the GPL can be applied should you wish to distribute
a combined work that includes FreeRTOS, without being obliged to provide
the source code for any proprietary components. See the licensing section
of http://www.FreeRTOS.org for full details of how and when the exception
can be applied.
***************************************************************************
***************************************************************************
* *
* Get the FreeRTOS eBook! See http://www.FreeRTOS.org/Documentation *
* *
* This is a concise, step by step, 'hands on' guide that describes both *
* general multitasking concepts and FreeRTOS specifics. It presents and *
* explains numerous examples that are written using the FreeRTOS API. *
* Full source code for all the examples is provided in an accompanying *
* .zip file. *
* *
***************************************************************************
***************************************************************************
Please ensure to read the configuration and relevant port sections of the
online documentation.
http://www.FreeRTOS.org - Documentation, latest information, license and
contact details.
http://www.SafeRTOS.com - A version that is certified for use in safety
critical systems.
http://www.OpenRTOS.com - Commercial support, development, porting,
licensing and training services.
*/
.title "crt0.S"
.extern main
.extern __stack
.extern __bss_start
.extern __text_start
.extern init_main
.equ MCF5XXX_RAMBAR_SPV, 0x00000200
.equ MCF5XXX_RAMBAR_V, 0x00000001
.global start
.align 4
debug:
.word 0x2C80 /* write to CSR */
.word 0x0010
.word 0x0400
.word 0x0000
start:
/* disable all interrupts on startup. */
move.w #0x2700, sr
/* prepare internal SRAM. */
move.l #__SRAM, d0
ori.l #( MCF5XXX_RAMBAR_SPV | MCF5XXX_RAMBAR_V ), d0
movec d0, rambar
/* prepare stack and frame pointer. */
move.l #__stack, sp
link a6, #-8
/* initialize hardware. */
jsr init_main
/* zero out the bss section. */
move.l #__bss_start, d1
move.l #_end, d0
cmp.l d0, d1
jbeq 3f
move.l d1, a0
sub.l d1, d0
subq.l #1, d0
2:
clr.b (a0)+
subq.l #1, d0
jbpl 2b
3:
/* Relocate the data section. */
move.l #__data_load_start, %a0 /* .data in ROM */
move.l #copy_start, %a1 /* .data in RAM */
/* Test if the two sections overlap. This is the case when we are working
* with the debugger and the debugger loads the .data section.
*/
cmpa.l %a0, %a1
beq 2f
1:
/* Have we already copied everything. */
cmpa.l #__data_load_end, %a0
beq 2f
move.b (%a0)+, (%a1)+
bra 1b
2:
/* C library */
move.l #__FINI_SECTION__, -(%sp)
jsr atexit
jsr __INIT_SECTION__
/* call main(int argc, char *argv[] */
move.l #0, -(sp)
move.l #0, -(sp)
move.l #0, -(sp)
jsr main
lea (sp, 12), %sp
/* stop on exit from main. */
1:
halt
|
