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authorJakub Jelinek <jakub@redhat.com>2007-07-12 18:26:36 +0000
committerJakub Jelinek <jakub@redhat.com>2007-07-12 18:26:36 +0000
commit0ecb606cb6cf65de1d9fc8a919bceb4be476c602 (patch)
tree2ea1f8305970753e4a657acb2ccc15ca3eec8e2c /csu/libc-start.c
parent7d58530341304d403a6626d7f7a1913165fe2f32 (diff)
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2.5-18.1
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diff --git a/csu/libc-start.c b/csu/libc-start.c
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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);
+}