2.5-18.1

1 files changed, 263 insertions, 0 deletions

diff --git a/csu/libc-start.c b/csu/libc-start.c
new file mode 100644
index 0000000000..194db6b1ec
--- /dev/null
+++ b/csu/libc-start.c
@@ -0,0 +1,263 @@
+/* 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);
+}