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
|
/* Initialization code for coldfire boards.
*
* Copyright (c) 2006 CodeSourcery Inc
*
* The authors hereby grant permission to use, copy, modify, distribute,
* and license this software and its documentation for any purpose, provided
* that existing copyright notices are retained in all copies and that this
* notice is included verbatim in any distributions. No written agreement,
* license, or royalty fee is required for any of the authorized uses.
* Modifications to this software may be copyrighted by their authors
* and need not follow the licensing terms described here, provided that
* the new terms are clearly indicated on the first page of each file where
* they apply.
*/
#include <stdlib.h>
extern const int __interrupt_vector[];
extern void __reset (void);
extern const char __data_load[] __attribute__ ((aligned (4)));
extern char __data_start[] __attribute__ ((aligned (4)));
extern char __bss_start[] __attribute__ ((aligned (4)));
extern char __end[] __attribute__ ((aligned (4)));
void *__heap_limit;
extern void software_init_hook (void) __attribute__ ((weak));
extern void hardware_init_hook (void) __attribute__ ((weak));
extern void _init (void);
extern void _fini (void);
extern int main (int, char **, char **);
/* This is called from a tiny assembly stub. */
void __start1 (void *heap_limit)
{
unsigned ix;
if (hardware_init_hook)
hardware_init_hook ();
/* Initialize memory */
if (__data_load != __data_start)
memcpy (__data_start, __data_load, __bss_start - __data_start);
memset (__bss_start, 0, __end - __bss_start);
__heap_limit = heap_limit;
if (software_init_hook)
software_init_hook ();
_init ();
/* I'm not sure how useful it is to have a fini_section in an
embedded system. */
atexit (_fini);
ix = main (0, NULL, NULL);
exit (ix);
while (1)
__reset ();
}
/* A default hardware init hook. */
void __attribute__ ((weak)) hardware_init_hook (void)
{
/* Set the VBR. */
__asm__ __volatile__ ("movec.l %0,%/vbr" :: "r" (__interrupt_vector));
#if !defined(__mcf_family_5213) && !defined(__mcf_family_51qe)
/* Flush & enable the caches */
#define CACR_CINV (1 << 24)
#define CACR_CENB (1 << 31)
__asm__ __volatile__ ("movec.l %0,%/cacr" :: "r" (CACR_CINV | CACR_CENB));
#endif
/* Should we drop into user mode here? */
}
|
