mirror of
https://sourceware.org/git/glibc.git
synced 2025-08-07 06:43:00 +03:00
(CFLAGS-tst-align.c): Add -mpreferred-stack-boundary=4.
This commit is contained in:
Ulrich Drepper
263
csu/libc-start.c
263
csu/libc-start.c
@@ -1,263 +0,0 @@
|
||||
/* 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);
|
||||
}
|
||||
Reference in New Issue
Block a user