diff options
Diffstat (limited to 'csu')
| -rw-r--r-- | csu/Makefile | 3 | ||||
| -rw-r--r-- | csu/elf-init.c | 82 |
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 (); +} |