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
|
/*
* Manuel Novoa III Feb 2001
*
* __uClibc_main is the routine to be called by all the arch-specific
* versions of crt0.S in uClibc.
*
* It is meant to handle any special initialization needed by the library
* such as setting the global variable(s) __environ (environ) and
* initializing the stdio package. Using weak symbols, the latter is
* avoided in the static library case.
*/
#include <stdlib.h>
#include <unistd.h>
/*
* Prototypes.
*/
extern int main(int argc, char **argv, char **envp);
void __uClibc_main(int argc, char **argv, char **envp)
__attribute__ ((__noreturn__));
/*
* Define an empty function and use it as a weak alias for the stdio
* initialization routine. That way we don't pull in all the stdio
* code unless we need to. Similarly, do the same for __stdio_close_all
* so as not to include atexit unnecessarily.
*
* NOTE!!! This is only true for the _static_ case!!!
*/
void __uClibc_empty_func(void)
{
}
__attribute__ ((__weak__, __alias__("__uClibc_empty_func")))
void __init_stdio(void);
__attribute__ ((__weak__, __alias__("__uClibc_empty_func")))
void __stdio_close_all(void);
typedef void (*vfuncp) (void);
vfuncp __uClibc_cleanup = __stdio_close_all;
/*
* Now for our main routine.
*/
void __uClibc_main(int argc, char **argv, char **envp)
{
/*
* Initialize the global variable __environ.
*/
__environ = envp;
/*
* Initialize stdio here. In the static library case, this will
* be bypassed if not needed because of the weak alias above.
*/
__init_stdio();
/*
* Finally, invoke application's main and then exit.
*/
exit(main(argc, argv, envp));
}
/*
* Declare the __environ global variable and create a weak alias environ.
*/
char **__environ = 0;
__asm__(".weak environ;environ = __environ");
|
