37f91d336d
* csu/Makefile (crtstuff): New variable consolidates crti, crtn; add crti_s, crtn_s. (install-lib, extra-objs, generated-, omit-deps): Use that. (initfini): New canned sequence, broken out of crt[in].s rule. (crt[in].s rule): Use it. (crt[in]_s.s): New rule. * csu/initfini.c (GLOBAL): New macro; define it to empty if undefined. (_init, _fini): Use GLOBAL as storage class. Add self reference to avoid GCC optimizing out the functions. * Makefile (headers): Remove $(stddef.h). * Makeconfig (stddef.h): Variable removed; now require gcc version >= 2.2. * stddef.h: File removed. Mon Feb 20 19:42:31 1995 Roland McGrath <roland@churchy.gnu.ai.mit.edu> * sysdeps/unix/bsd/ultrix4/mips/start.S: Remove `__environ' definition. * sysdeps/unix/bsd/osf1/alpha/start.S: Likewise. * stdlib/strtod.c: Allow the string to start with a decimal point without a leading zero.
95 lines
3.5 KiB
C
95 lines
3.5 KiB
C
/* Special .init and .fini section support.
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Copyright (C) 1995 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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/* This file is compiled into assembly code which is then surrounded by the
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lines `cat > crtcommon.tmp <<\EOF_common' and `EOF_common' and thus
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becomes a shell script which creates three files of assembly code.
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* The first file is crti.s-new; this puts a function prologue at the
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beginning of the .init and .fini sections and defines global symbols for
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those addresses, so they can be called as functions.
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* The second file is crtn.s-new; this puts the corresponding function
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epilogues in the .init and .fini sections.
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* The third file is crtcommon.tmp, which is whatever miscellaneous cruft
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the compiler generated at the end; it should be appended to both crti.s-new
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and crtn.s-new. */
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#include <stdlib.h>
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/* We are compiled with -DGLOBAL=static to generate the versions used for
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shared libraries' .init and .fini sections, which do not have entry
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point symbols. */
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#ifndef GLOBAL
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#define GLOBAL
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#endif
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/* These declarations make the functions go in the right sections when
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we define them below. GCC syntax does not allow the attribute
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specifications to be in the function definitions themselves. */
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GLOBAL void _init (void) __attribute__ ((section (".init")));
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GLOBAL void _fini (void) __attribute__ ((section (".fini")));
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/* End the here document containing the initial common code.
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Then move the output file crtcommon.tmp to crti.s-new and crtn.s-new. */
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asm ("\nEOF_common\n\
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mv -f crtcommon.tmp crti.s-new\n\
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cp -f crti.s-new crtn.s-new");
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/* Append the .init prologue to crti.s-new. */
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asm ("cat >> crti.s-new <<\\EOF.crti.init");
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GLOBAL void
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_init (void)
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{
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(void) &_init; /* Don't optimize out the function! */
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/* End the here document containing the .init prologue code.
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Then fetch the .section directive just written and append that
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to crtn.s-new, followed by the function epilogue. */
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asm ("\nEOF.crti.init
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\n\
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fgrep .init crti.s-new >>crtn.s-new\n\
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cat >> crtn.s-new <<\\EOF.crtn.init");
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}
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/* End the here document containing the .init epilogue code.
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Then append the .fini prologue to crti.s-new. */
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asm ("\nEOF.crtn.init\
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\n\
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cat >> crti.s-new <<\\EOF.crti.fini");
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GLOBAL void
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_fini (void)
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{
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(void) &_fini; /* Don't optimize out the function! */
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/* End the here document containing the .fini prologue code.
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Then fetch the .section directive just written and append that
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to crtn.s-new, followed by the function epilogue. */
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asm ("\nEOF.crti.fini\
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\n\
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fgrep .fini crti.s-new >>crtn.s-new\n\
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cat >> crtn.s-new <<\\EOF.crtn.fini");
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}
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/* End the here document containing the .fini epilogue code.
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Finally, put the remainder of the generated assembly into crtcommon.tmp. */
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asm ("\nEOF.crtn.fini\
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\n\
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cat > crtcommon.tmp <<\\EOF_common");
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