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authorRoland McGrath <roland@hack.frob.com>2012-10-01 12:55:34 -0700
committerRoland McGrath <roland@hack.frob.com>2012-10-01 12:55:34 -0700
commit93c65d438497842a42fe4f6a8af272d20a143025 (patch)
tree112d49bebbc46a568d5e8f4fb074c87a9d80f736 /csu
parent55a051c985c3e7965a2f5dd5f762ac2737adae01 (diff)
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Clean up init-first.c files.
Diffstat (limited to 'csu')
-rw-r--r--csu/init-first.c89
1 files changed, 71 insertions, 18 deletions
diff --git a/csu/init-first.c b/csu/init-first.c
index 050959d..0cfabbc 100644
--- a/csu/init-first.c
+++ b/csu/init-first.c
@@ -1,4 +1,4 @@
-/* Initialization code run first thing by the ELF startup code. Stub version.
+/* Initialization code run first thing by the ELF startup code. Common version
Copyright (C) 1995-2012 Free Software Foundation, Inc.
This file is part of the GNU C Library.
@@ -17,40 +17,76 @@
<http://www.gnu.org/licenses/>. */
#include <ctype.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <fcntl.h>
#include <unistd.h>
+#include <sysdep.h>
+#include <fpu_control.h>
+#include <sys/param.h>
#include <sys/types.h>
+#include <libc-internal.h>
+
+#include <ldsodefs.h>
/* Set nonzero if we have to be prepared for more then one libc being
used in the process. Safe assumption if initializer never runs. */
int __libc_multiple_libcs attribute_hidden = 1;
-extern void __libc_init (int, char **, char **);
-#ifdef USE_NONOPTION_FLAGS
-extern void __getopt_clean_environment (char **);
-#endif
+/* Remember the command line argument and enviroment contents for
+ later calls of initializers for dynamic libraries. */
+int __libc_argc attribute_hidden;
+char **__libc_argv attribute_hidden;
+
-#ifdef SHARED
void
-__libc_init_first (void)
+__libc_init_first (int argc, char **argv, char **envp)
{
+#ifdef SHARED
+ /* For DSOs we do not need __libc_init_first but instead _init. */
}
+
+void
+attribute_hidden
+_init (int argc, char **argv, char **envp)
+{
+#endif
+#ifdef USE_NONOPTION_FLAGS
+ extern void __getopt_clean_environment (char **);
#endif
+ __libc_multiple_libcs = &_dl_starting_up && !_dl_starting_up;
+
+ /* Make sure we don't initialize twice. */
+ if (!__libc_multiple_libcs)
+ {
+ /* Set the FPU control word to the proper default value if the
+ kernel would use a different value. (In a static program we
+ don't have this information.) */
#ifdef SHARED
-/* NOTE! The linker notices the magical name `_init' and sets the DT_INIT
- pointer in the dynamic section based solely on that. It is convention
- for this function to be in the `.init' section, but the symbol name is
- the only thing that really matters!! */
-void _init
-#else
-void __libc_init_first
+ if (__fpu_control != GLRO(dl_fpu_control))
#endif
-(int argc, char *arg0, ...)
-{
- char **argv = &arg0, **envp = &argv[argc + 1];
+ __setfpucw (__fpu_control);
+ }
+ /* Save the command-line arguments. */
+ __libc_argc = argc;
+ __libc_argv = argv;
__environ = envp;
- __libc_init (argc, argv, envp);
+
+#ifndef SHARED
+ __libc_init_secure ();
+
+ /* First the initialization which normally would be done by the
+ dynamic linker. */
+ _dl_non_dynamic_init ();
+#endif
+
+#ifdef VDSO_SETUP
+ VDSO_SETUP ();
+#endif
+
+ __init_misc (argc, argv, envp);
#ifdef USE_NONOPTION_FLAGS
/* This is a hack to make the special getopt in GNU libc working. */
@@ -59,4 +95,21 @@ void __libc_init_first
/* Initialize ctype data. */
__ctype_init ();
+
+#if defined SHARED && !defined NO_CTORS_DTORS_SECTIONS
+ __libc_global_ctors ();
+#endif
+}
+
+/* This function is defined here so that if this file ever gets into
+ ld.so we will get a link error. Having this file silently included
+ in ld.so causes disaster, because the _init definition above will
+ cause ld.so to gain an init function, which is not a cool thing. */
+
+extern void _dl_start (void) __attribute__ ((noreturn));
+
+void
+_dl_start (void)
+{
+ abort ();
}