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
136
137
138
139
140
141
142
143
144
|
/*
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright © 2019 Keith Packard
*
* 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. Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "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 THE
* COPYRIGHT HOLDER OR CONTRIBUTORS 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.
*/
#include <string.h>
#include <picotls.h>
#include <stdint.h>
#include <stdlib.h>
extern char __data_source[];
extern char __data_start[];
extern char __data_end[];
extern char __data_size[];
extern char __bss_start[];
extern char __bss_end[];
extern char __bss_size[];
extern char __tls_base[];
extern char __tdata_end[];
extern char __tls_end[];
#ifdef __PICOCRT_RUNTIME_SIZE
#define __data_size (__data_end - __data_start)
#define __bss_size (__bss_end - __bss_start)
#endif
/* These two functions must be defined in the architecture-specific
* code
*/
void
_start(void);
/* This is the application entry point */
int
main(int, char **);
#ifdef __INIT_FINI_ARRAY
extern void __libc_init_array(void);
#endif
/* After the architecture-specific chip initialization is done, this
* function initializes the data and bss segments. Note that a static
* block of TLS data is carefully interleaved with the regular data
* and bss segments in picolibc.ld so that this one operation
* initializes both. Then it runs the application code, starting with
* any initialization functions, followed by the main application
* entry point and finally any cleanup functions
*/
#include <picotls.h>
#include <stdio.h>
#ifdef __ARM_SEMIHOST
#include <semihost.h>
#endif
#ifndef CONSTRUCTORS
#define CONSTRUCTORS 1
#endif
static __noreturn __always_inline void
__start(void)
{
memcpy(__data_start, __data_source, (uintptr_t) __data_size);
memset(__bss_start, '\0', (uintptr_t) __bss_size);
#ifdef POST_MEMORY_SETUP
POST_MEMORY_SETUP();
#endif
#ifdef __THREAD_LOCAL_STORAGE
_set_tls(__tls_base);
#endif
#if defined(__INIT_FINI_ARRAY) && CONSTRUCTORS
__libc_init_array();
#endif
#if defined(CRT0_SEMIHOST) && defined(__ARM_SEMIHOST)
#define CMDLINE_LEN 1024
#define ARGV_LEN 64
static char cmdline[CMDLINE_LEN];
static char *argv[ARGV_LEN];
int argc = 0;
if (sys_semihost_get_cmdline(cmdline, sizeof(cmdline)) == 0 &&
cmdline[0])
{
char *c = cmdline;
while (*c && argc < ARGV_LEN - 1) {
argv[argc++] = c;
while (*c && *c != ' ')
c++;
if (!*c)
break;
*c = '\0';
while (*++c == ' ')
;
}
} else
argv[argc++] = "program-name";
argv[argc] = NULL;
#else
#define argv NULL
#define argc 0
#endif
int ret = main(argc, argv);
#ifdef CRT0_EXIT
exit(ret);
#else
(void) ret;
for(;;);
#endif
}
|
