aboutsummaryrefslogtreecommitdiff
path: root/csu
diff options
context:
space:
mode:
Diffstat (limited to 'csu')
-rw-r--r--csu/Makefile3
-rw-r--r--csu/elf-init.c82
2 files changed, 84 insertions, 1 deletions
diff --git a/csu/Makefile b/csu/Makefile
index 6b6991935a..f3b099ee40 100644
--- a/csu/Makefile
+++ b/csu/Makefile
@@ -27,9 +27,10 @@
subdir := csu
routines = init-first libc-start $(libc-init) sysdep version check_fds \
- libc-tls
+ libc-tls elf-init
aux = errno
elide-routines.os = libc-tls
+static-only-routines = elf-init
csu-dummies = $(filter-out $(start-installed-name),crt1.o Mcrt1.o)
extra-objs = start.o gmon-start.o \
$(start-installed-name) g$(start-installed-name) $(csu-dummies)
diff --git a/csu/elf-init.c b/csu/elf-init.c
new file mode 100644
index 0000000000..c28b73ca62
--- /dev/null
+++ b/csu/elf-init.c
@@ -0,0 +1,82 @@
+/* Startup support for ELF initializers/finalizers in the main executable.
+ Copyright (C) 2002 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 <stddef.h>
+
+#ifdef HAVE_INITFINI_ARRAY
+/* These magic symbols are provided by the linker. */
+extern void (*__preinit_array_start []) (void);
+extern void (*__preinit_array_end []) (void);
+extern void (*__init_array_start []) (void);
+extern void (*__init_array_end []) (void);
+extern void (*__fini_array_start []) (void);
+extern void (*__fini_array_end []) (void);
+#endif
+
+/* These function symbols are provided for the .init/.fini section entry
+ points automagically by the linker. */
+extern void _init (void);
+extern void _fini (void);
+
+/* These functions are passed to __libc_start_main by the startup code.
+ These get statically linked into each program. For dynamically linked
+ programs, this module will come from libc_nonshared.a and differs from
+ the libc.a module in that it doesn't call the preinit array. */
+
+void
+__libc_csu_init (void)
+{
+#ifdef HAVE_INITFINI_ARRAY
+ /* For dynamically linked executables the preinit array is executed by
+ the dynamic linker (before initializing any shared object. */
+
+# ifndef LIBC_NONSHARED
+ /* For static executables, preinit happens rights before init. */
+ {
+ const size_t size = __preinit_array_end - __preinit_array_start;
+ size_t i;
+ for (i = 0; i < size; i++)
+ (*__preinit_array_start [i]) ();
+ }
+# endif
+#endif
+
+ _init ();
+
+#ifdef HAVE_INITFINI_ARRAY
+ {
+ const size_t size = __init_array_end - __init_array_start;
+ size_t i;
+ for (i = 0; i < size; i++)
+ (*__init_array_start [i]) ();
+ }
+#endif
+}
+
+void
+__libc_csu_fini (void)
+{
+#ifdef HAVE_INITFINI_ARRAY
+ size_t i = __fini_array_end - __fini_array_start;
+ while (i-- > 0)
+ (*__fini_array_start [i]) ();
+#endif
+
+ _fini ();
+}