mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-22 10:50:07 +00:00
710f7bab59
* elf/dl-lookup.c (_dl_lookup_symbol): Take new arg RELOC_ADDR and don't allow a defn resolving to that address. * elf/link.h: Update prototype and comment. * elf/dl-runtime.c (fixup): Define local `resolve' function and pass it to elf_machine_relplt. * elf/dl-reloc.c (_dl_relocate_object: resolve): Take new arg RELOC_ADDR and pass it through to _dl_lookup_symbol. * elf/do-rel.h (elf_dynamic_do_rel): Pass RESOLVE to elf_machine_rel instead of calling it ourselves and passing its results. (elf_dynamic_do_rel): RESOLVE fn takes new arg RELOC_ADDR. * elf/rtld.c (dl_main): Pass 0 for RELOC_ADDR to _dl_lookup_symbol. * sysdeps/i386/dl-machine.h (elf_machine_rel): Remove SYM_LOADADDR arg. Add RESOLVE function ptr arg. Call *RESOLVE as necessary. * sysdeps/m68k/dl-machine.h (elf_machine_rela): Likewise. * sysdeps/stub/dl-machine.h: Likewise. * csu/initfini.c (_fini): Add extern decl for i_am_not_a_leaf. * elf/dlfcn.h (dl_open_mode): Enumerated type removed. (RTLD_LAZY, RTLD_NOW): Define these as macros instead. (RTLD_GLOBAL): New macro. (dlopen): Take arg of type int instead of dl_open_mode. * elf/dlopen.c: Likewise. * math/math.h (_Mldbl): New macro, either produces L suffix or not. (M_*): Use it for these constants.
123 lines
4.3 KiB
C
123 lines
4.3 KiB
C
/* Special .init and .fini section support.
|
|
Copyright (C) 1995, 1996 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 Library General Public License as
|
|
published by the Free Software Foundation; either version 2 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
|
|
Library General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Library General Public
|
|
License along with the GNU C Library; see the file COPYING.LIB. If
|
|
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
|
|
Cambridge, MA 02139, USA. */
|
|
|
|
/* This file is compiled into assembly code which is then surrounded by the
|
|
lines `cat > crtcommon.tmp <<\EOF_common' and `EOF_common' and thus
|
|
becomes a shell script which creates three files of assembly code.
|
|
|
|
* The first file is crti.s-new; this puts a function prologue at the
|
|
beginning of the .init and .fini sections and defines global symbols for
|
|
those addresses, so they can be called as functions.
|
|
|
|
* The second file is crtn.s-new; this puts the corresponding function
|
|
epilogues in the .init and .fini sections.
|
|
|
|
* The third file is crtcommon.tmp, which is whatever miscellaneous cruft
|
|
the compiler generated at the end; it should be appended to both crti.s-new
|
|
and crtn.s-new. */
|
|
|
|
#include <stdlib.h>
|
|
|
|
|
|
#ifdef HAVE_ELF
|
|
/* These declarations make the functions go in the right sections when
|
|
we define them below. GCC syntax does not allow the attribute
|
|
specifications to be in the function definitions themselves. */
|
|
void _init (void) __attribute__ ((section (".init")));
|
|
void _fini (void) __attribute__ ((section (".fini")));
|
|
|
|
#define SECTION(x) /* Put nothing extra before the defn. */
|
|
|
|
#else
|
|
/* Some non-ELF systems support .init and .fini sections,
|
|
but the __attribute__ syntax only works for ELF. */
|
|
#define SECTION(x) asm (".section " x);
|
|
#endif
|
|
|
|
/* End the here document containing the initial common code.
|
|
Then move the output file crtcommon.tmp to crti.s-new and crtn.s-new. */
|
|
asm ("\nEOF_common\n\
|
|
rm -f crti.s-new crtn.s-new\n\
|
|
mv crtcommon.tmp crti.s-new\n\
|
|
cp crti.s-new crtn.s-new");
|
|
|
|
/* Append the .init prologue to crti.s-new. */
|
|
asm ("cat >> crti.s-new <<\\EOF.crti.init");
|
|
|
|
SECTION (".init")
|
|
void
|
|
_init (void)
|
|
{
|
|
/* We cannot use the normal constructor mechanism in gcrt1.o because it
|
|
appears before crtbegin.o in the link, so the header elt of .ctors
|
|
would come after the elt for __gmon_start__. One approach is for
|
|
gcrt1.o to reference a symbol which would be defined by some library
|
|
module which has a constructor; but then user code's constructors
|
|
would come first, and not be profiled. */
|
|
extern void __gmon_start__ (void) __attribute__ ((weak));
|
|
weak_symbol (__gmon_start__)
|
|
if (__gmon_start__)
|
|
__gmon_start__ ();
|
|
|
|
/* End the here document containing the .init prologue code.
|
|
Then fetch the .section directive just written and append that
|
|
to crtn.s-new, followed by the function epilogue. */
|
|
asm ("\nEOF.crti.init
|
|
\n\
|
|
fgrep .init crti.s-new >>crtn.s-new\n\
|
|
cat >> crtn.s-new <<\\EOF.crtn.init");
|
|
}
|
|
|
|
/* End the here document containing the .init epilogue code.
|
|
Then append the .fini prologue to crti.s-new. */
|
|
asm ("\nEOF.crtn.init\
|
|
\n\
|
|
cat >> crti.s-new <<\\EOF.crti.fini");
|
|
|
|
SECTION (".fini")
|
|
void
|
|
_fini (void)
|
|
{
|
|
/* End the here document containing the .fini prologue code.
|
|
Then fetch the .section directive just written and append that
|
|
to crtn.s-new, followed by the function epilogue. */
|
|
asm ("\nEOF.crti.fini\
|
|
\n\
|
|
cat > /dev/null <<\\EOF.fini.skip");
|
|
|
|
{
|
|
/* Let GCC know that _fini is not a leaf function by having a dummy
|
|
function call here. We arrange for this call to be omitted from
|
|
either crt file. */
|
|
extern void i_am_not_a_leaf (void);
|
|
i_am_not_a_leaf ();
|
|
}
|
|
|
|
asm ("\nEOF.fini.skip\
|
|
\n\
|
|
fgrep .fini crti.s-new >>crtn.s-new\n\
|
|
cat >> crtn.s-new <<\\EOF.crtn.fini");
|
|
}
|
|
|
|
/* End the here document containing the .fini epilogue code.
|
|
Finally, put the remainder of the generated assembly into crtcommon.tmp. */
|
|
asm ("\nEOF.crtn.fini\
|
|
\n\
|
|
cat > crtcommon.tmp <<\\EOF_common");
|