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initial import

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Roland McGrath
1995-02-18 01:27:10 +00:00
commit 28f540f45b
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csu/initfini.c Normal file
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/* Special .init and .fini section support.
Copyright (C) 1995 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>
/* 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")));
/* 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\
mv -f crtcommon.tmp crti.s-new\n\
cp -f crti.s-new crtn.s-new");
/* Append the .init prologue to crti.s-new. */
asm ("cat >> crti.s-new <<\\EOF.crti.init");
void
_init (void)
{
/* 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");
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\
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");