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
|
#include <elf.h>
#include "libc.h"
void __init_tls(size_t *);
void __init_security(size_t *);
#ifndef SHARED
static void dummy() {}
weak_alias(dummy, _init);
extern void (*const __init_array_start)() __attribute__((weak));
extern void (*const __init_array_end)() __attribute__((weak));
#endif
static void dummy1(void *p) {}
weak_alias(dummy1, __init_ssp);
#define AUX_CNT 38
extern size_t __hwcap, __sysinfo;
extern char *__progname, *__progname_full;
void __init_libc(char **envp, char *pn)
{
size_t i, *auxv, aux[AUX_CNT] = { 0 };
__environ = envp;
for (i=0; envp[i]; i++);
libc.auxv = auxv = (void *)(envp+i+1);
for (i=0; auxv[i]; i+=2) if (auxv[i]<AUX_CNT) aux[auxv[i]] = auxv[i+1];
__hwcap = aux[AT_HWCAP];
__sysinfo = aux[AT_SYSINFO];
libc.page_size = aux[AT_PAGESZ];
if (pn) {
__progname = __progname_full = pn;
for (i=0; pn[i]; i++) if (pn[i]=='/') __progname = pn+i+1;
}
__init_tls(aux);
__init_ssp((void *)aux[AT_RANDOM]);
__init_security(aux);
}
int __libc_start_main(int (*main)(int,char **,char **), int argc, char **argv)
{
char **envp = argv+argc+1;
#ifndef SHARED
__init_libc(envp, argv[0]);
_init();
uintptr_t a = (uintptr_t)&__init_array_start;
for (; a<(uintptr_t)&__init_array_end; a+=sizeof(void(*)()))
(*(void (**)())a)();
#endif
/* Pass control to to application */
exit(main(argc, argv, envp));
return 0;
}
|
