mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-22 13:00:06 +00:00
1c3c269b55
Before the change they crash on startup. Perform IREL relocations earlier to prevent this.
141 lines
4.6 KiB
C
141 lines
4.6 KiB
C
/* Startup support for ELF initializers/finalizers in the main executable.
|
|
Copyright (C) 2002, 2003, 2004, 2005, 2009 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.
|
|
|
|
In addition to the permissions in the GNU Lesser General Public
|
|
License, the Free Software Foundation gives you unlimited
|
|
permission to link the compiled version of this file with other
|
|
programs, and to distribute those programs without any restriction
|
|
coming from the use of this file. (The GNU Lesser General Public
|
|
License restrictions do apply in other respects; for example, they
|
|
cover modification of the file, and distribution when not linked
|
|
into another program.)
|
|
|
|
Note that people who make modified versions of this file are not
|
|
obligated to grant this special exception for their modified
|
|
versions; it is their choice whether to do so. The GNU Lesser
|
|
General Public License gives permission to release a modified
|
|
version without this exception; this exception also makes it
|
|
possible to release a modified version which carries forward this
|
|
exception.
|
|
|
|
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>
|
|
|
|
#if defined USE_MULTIARCH && !defined LIBC_NONSHARED
|
|
# include <link.h>
|
|
# include <dl-irel.h>
|
|
|
|
# ifdef ELF_MACHINE_IRELA
|
|
extern const ElfW(Rela) __rela_iplt_start [];
|
|
extern const ElfW(Rela) __rela_iplt_end [];
|
|
# endif
|
|
|
|
# ifdef ELF_MACHINE_IREL
|
|
extern const ElfW(Rel) __rel_iplt_start [];
|
|
extern const ElfW(Rel) __rel_iplt_end [];
|
|
# endif
|
|
#endif /* LIBC_NONSHARED */
|
|
|
|
/* These magic symbols are provided by the linker. */
|
|
extern void (*__preinit_array_start []) (int, char **, char **)
|
|
attribute_hidden;
|
|
extern void (*__preinit_array_end []) (int, char **, char **)
|
|
attribute_hidden;
|
|
extern void (*__init_array_start []) (int, char **, char **)
|
|
attribute_hidden;
|
|
extern void (*__init_array_end []) (int, char **, char **)
|
|
attribute_hidden;
|
|
extern void (*__fini_array_start []) (void) attribute_hidden;
|
|
extern void (*__fini_array_end []) (void) attribute_hidden;
|
|
|
|
|
|
/* 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 and performs
|
|
explicit IREL{,A} relocations. */
|
|
|
|
|
|
#ifndef LIBC_NONSHARED
|
|
void
|
|
__libc_csu_irel (void)
|
|
{
|
|
# ifdef USE_MULTIARCH
|
|
# ifdef ELF_MACHINE_IRELA
|
|
{
|
|
const size_t size = __rela_iplt_end - __rela_iplt_start;
|
|
for (size_t i = 0; i < size; i++)
|
|
elf_irela (&__rela_iplt_start [i]);
|
|
}
|
|
# endif
|
|
|
|
# ifdef ELF_MACHINE_IREL
|
|
{
|
|
const size_t size = __rel_iplt_end - __rel_iplt_start;
|
|
for (size_t i = 0; i < size; i++)
|
|
elf_irel (&__rel_iplt_start [i]);
|
|
}
|
|
# endif
|
|
# endif
|
|
}
|
|
#endif
|
|
|
|
|
|
void
|
|
__libc_csu_init (int argc, char **argv, char **envp)
|
|
{
|
|
/* 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 right 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]) (argc, argv, envp);
|
|
}
|
|
#endif
|
|
|
|
_init ();
|
|
|
|
const size_t size = __init_array_end - __init_array_start;
|
|
for (size_t i = 0; i < size; i++)
|
|
(*__init_array_start [i]) (argc, argv, envp);
|
|
}
|
|
|
|
/* This function should not be used anymore. We run the executable's
|
|
destructor now just like any other. We cannot remove the function,
|
|
though. */
|
|
void
|
|
__libc_csu_fini (void)
|
|
{
|
|
#ifndef LIBC_NONSHARED
|
|
size_t i = __fini_array_end - __fini_array_start;
|
|
while (i-- > 0)
|
|
(*__fini_array_start [i]) ();
|
|
|
|
_fini ();
|
|
#endif
|
|
}
|