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/* Copyright (C) 1998-2003, 2004, 2005 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <ldsodefs.h>
#include <bp-start.h>
#include <bp-sym.h>
extern void __libc_init_first (int argc, char **argv, char **envp);
extern int __libc_multiple_libcs;
#include <tls.h>
#ifndef SHARED
# include <dl-osinfo.h>
extern void __pthread_initialize_minimal (void)
# if !(USE_TLS - 0) && !defined NONTLS_INIT_TP
__attribute__ ((weak))
# endif
;
# ifndef THREAD_SET_STACK_GUARD
/* Only exported for architectures that don't store the stack guard canary
in thread local area. */
uintptr_t __stack_chk_guard attribute_relro;
# endif
#endif
#ifdef HAVE_PTR_NTHREADS
/* We need atomic operations. */
# include <atomic.h>
#endif
#ifdef LIBC_START_MAIN
# ifdef LIBC_START_DISABLE_INLINE
# define STATIC static
# else
# define STATIC static inline __attribute__ ((always_inline))
# endif
#else
# define STATIC
# define LIBC_START_MAIN BP_SYM (__libc_start_main)
#endif
#ifdef MAIN_AUXVEC_ARG
/* main gets passed a pointer to the auxiliary. */
# define MAIN_AUXVEC_DECL , void *
# define MAIN_AUXVEC_PARAM , auxvec
#else
# define MAIN_AUXVEC_DECL
# define MAIN_AUXVEC_PARAM
#endif
STATIC int LIBC_START_MAIN (int (*main) (int, char **, char **
MAIN_AUXVEC_DECL),
int argc,
char *__unbounded *__unbounded ubp_av,
#ifdef LIBC_START_MAIN_AUXVEC_ARG
ElfW(auxv_t) *__unbounded auxvec,
#endif
__typeof (main) init,
void (*fini) (void),
void (*rtld_fini) (void),
void *__unbounded stack_end)
__attribute__ ((noreturn));
/* Note: the fini parameter is ignored here for shared library. It
is registered with __cxa_atexit. This had the disadvantage that
finalizers were called in more than one place. */
STATIC int
LIBC_START_MAIN (int (*main) (int, char **, char ** MAIN_AUXVEC_DECL),
int argc, char *__unbounded *__unbounded ubp_av,
#ifdef LIBC_START_MAIN_AUXVEC_ARG
ElfW(auxv_t) *__unbounded auxvec,
#endif
__typeof (main) init,
void (*fini) (void),
void (*rtld_fini) (void), void *__unbounded stack_end)
{
#if __BOUNDED_POINTERS__
char **argv;
#else
# define argv ubp_av
#endif
/* Result of the 'main' function. */
int result;
__libc_multiple_libcs = &_dl_starting_up && !_dl_starting_up;
#ifndef SHARED
char *__unbounded *__unbounded ubp_ev = &ubp_av[argc + 1];
INIT_ARGV_and_ENVIRON;
/* Store the lowest stack address. This is done in ld.so if this is
the code for the DSO. */
__libc_stack_end = stack_end;
# ifdef HAVE_AUX_VECTOR
/* First process the auxiliary vector since we need to find the
program header to locate an eventually present PT_TLS entry. */
# ifndef LIBC_START_MAIN_AUXVEC_ARG
ElfW(auxv_t) *__unbounded auxvec;
{
char *__unbounded *__unbounded evp = ubp_ev;
while (*evp++ != NULL)
;
auxvec = (ElfW(auxv_t) *__unbounded) evp;
}
# endif
_dl_aux_init (auxvec);
# endif
# ifdef DL_SYSDEP_OSCHECK
if (!__libc_multiple_libcs)
{
/* This needs to run to initiliaze _dl_osversion before TLS
setup might check it. */
DL_SYSDEP_OSCHECK (__libc_fatal);
}
# endif
/* Initialize the thread library at least a bit since the libgcc
functions are using thread functions if these are available and
we need to setup errno. If there is no thread library and we
handle TLS the function is defined in the libc to initialized the
TLS handling. */
# if !(USE_TLS - 0) && !defined NONTLS_INIT_TP
if (__pthread_initialize_minimal)
# endif
__pthread_initialize_minimal ();
#endif
# ifndef SHARED
/* Set up the stack checker's canary. */
uintptr_t stack_chk_guard = _dl_setup_stack_chk_guard ();
# ifdef THREAD_SET_STACK_GUARD
THREAD_SET_STACK_GUARD (stack_chk_guard);
# else
__stack_chk_guard = stack_chk_guard;
# endif
#endif
/* Register the destructor of the dynamic linker if there is any. */
if (__builtin_expect (rtld_fini != NULL, 1))
__cxa_atexit ((void (*) (void *)) rtld_fini, NULL, NULL);
#ifndef SHARED
/* Call the initializer of the libc. This is only needed here if we
are compiling for the static library in which case we haven't
run the constructors in `_dl_start_user'. */
__libc_init_first (argc, argv, __environ);
/* Register the destructor of the program, if any. */
if (fini)
__cxa_atexit ((void (*) (void *)) fini, NULL, NULL);
/* Some security at this point. Prevent starting a SUID binary where
the standard file descriptors are not opened. We have to do this
only for statically linked applications since otherwise the dynamic
loader did the work already. */
if (__builtin_expect (__libc_enable_secure, 0))
__libc_check_standard_fds ();
#endif
/* Call the initializer of the program, if any. */
#ifdef SHARED
if (__builtin_expect (GLRO(dl_debug_mask) & DL_DEBUG_IMPCALLS, 0))
GLRO(dl_debug_printf) ("\ninitialize program: %s\n\n", argv[0]);
#endif
if (init)
(*init) (argc, argv, __environ MAIN_AUXVEC_PARAM);
#ifdef SHARED
/* Auditing checkpoint: we have a new object. */
if (__builtin_expect (GLRO(dl_naudit) > 0, 0))
{
struct audit_ifaces *afct = GLRO(dl_audit);
struct link_map *head = GL(dl_ns)[LM_ID_BASE]._ns_loaded;
for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt)
{
if (afct->preinit != NULL)
afct->preinit (&head->l_audit[cnt].cookie);
afct = afct->next;
}
}
#endif
#ifdef SHARED
if (__builtin_expect (GLRO(dl_debug_mask) & DL_DEBUG_IMPCALLS, 0))
GLRO(dl_debug_printf) ("\ntransferring control: %s\n\n", argv[0]);
#endif
#ifdef HAVE_CLEANUP_JMP_BUF
/* Memory for the cancellation buffer. */
struct pthread_unwind_buf unwind_buf;
int not_first_call;
not_first_call = setjmp ((struct __jmp_buf_tag *) unwind_buf.cancel_jmp_buf);
if (__builtin_expect (! not_first_call, 1))
{
struct pthread *self = THREAD_SELF;
/* Store old info. */
unwind_buf.priv.data.prev = THREAD_GETMEM (self, cleanup_jmp_buf);
unwind_buf.priv.data.cleanup = THREAD_GETMEM (self, cleanup);
/* Store the new cleanup handler info. */
THREAD_SETMEM (self, cleanup_jmp_buf, &unwind_buf);
/* Run the program. */
result = main (argc, argv, __environ MAIN_AUXVEC_PARAM);
}
else
{
/* Remove the thread-local data. */
# ifdef SHARED
__libc_pthread_functions.ptr__nptl_deallocate_tsd ();
# else
extern void __nptl_deallocate_tsd (void) __attribute ((weak));
__nptl_deallocate_tsd ();
# endif
/* One less thread. Decrement the counter. If it is zero we
terminate the entire process. */
result = 0;
# ifdef SHARED
unsigned int *const ptr = __libc_pthread_functions.ptr_nthreads;
# else
extern unsigned int __nptl_nthreads __attribute ((weak));
unsigned int *const ptr = &__nptl_nthreads;
# endif
if (! atomic_decrement_and_test (ptr))
/* Not much left to do but to exit the thread, not the process. */
__exit_thread (0);
}
#else
/* Nothing fancy, just call the function. */
result = main (argc, argv, __environ MAIN_AUXVEC_PARAM);
#endif
exit (result);
}
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