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73 lines
1.7 KiB
73 lines
1.7 KiB
#include <elf.h>
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#include <poll.h>
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#include <fcntl.h>
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#include "syscall.h"
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#include "atomic.h"
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#include "libc.h"
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void __init_tls(size_t *);
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#ifndef SHARED
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static void dummy() {}
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weak_alias(dummy, _init);
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extern void (*const __init_array_start)() __attribute__((weak));
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extern void (*const __init_array_end)() __attribute__((weak));
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#endif
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static void dummy1(void *p) {}
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weak_alias(dummy1, __init_ssp);
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#define AUX_CNT 38
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extern size_t __hwcap, __sysinfo;
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extern char *__progname, *__progname_full;
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#ifndef SHARED
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static
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#endif
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void __init_libc(char **envp, char *pn)
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{
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size_t i, *auxv, aux[AUX_CNT] = { 0 };
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__environ = envp;
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for (i=0; envp[i]; i++);
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libc.auxv = auxv = (void *)(envp+i+1);
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for (i=0; auxv[i]; i+=2) if (auxv[i]<AUX_CNT) aux[auxv[i]] = auxv[i+1];
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__hwcap = aux[AT_HWCAP];
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__sysinfo = aux[AT_SYSINFO];
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libc.page_size = aux[AT_PAGESZ];
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if (pn) {
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__progname = __progname_full = pn;
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for (i=0; pn[i]; i++) if (pn[i]=='/') __progname = pn+i+1;
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}
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__init_tls(aux);
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__init_ssp((void *)aux[AT_RANDOM]);
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if (aux[AT_UID]==aux[AT_EUID] && aux[AT_GID]==aux[AT_EGID]
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&& !aux[AT_SECURE]) return;
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struct pollfd pfd[3] = { {.fd=0}, {.fd=1}, {.fd=2} };
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__syscall(SYS_poll, pfd, 3, 0);
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for (i=0; i<3; i++) if (pfd[i].revents&POLLNVAL)
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if (__syscall(SYS_open, "/dev/null", O_RDWR|O_LARGEFILE)<0)
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a_crash();
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libc.secure = 1;
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}
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int __libc_start_main(int (*main)(int,char **,char **), int argc, char **argv)
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{
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char **envp = argv+argc+1;
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#ifndef SHARED
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__init_libc(envp, argv[0]);
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_init();
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uintptr_t a = (uintptr_t)&__init_array_start;
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for (; a<(uintptr_t)&__init_array_end; a+=sizeof(void(*)()))
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(*(void (**)())a)();
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#endif
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/* Pass control to to application */
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exit(main(argc, argv, envp));
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return 0;
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}
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