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freebsd-dev/lib/csu/amd64/crtn.S

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Import C startup files for ELF support. Submitted by: John Polstra <jdp@polstra.com>
1998-03-07 20:27:11 +00:00
/*-
This is step 1 in an effort to unify the start-up files for the various architectures. Now all the work is done in crtbegin.c. It doesn't contain any assembly language code, so it should work fine on all architectures. (I have tested it on the i386 and the alpha.) The old assembly language files crt[in].S are now empty shells that generate no code or data. They should not be removed any time soon, because the various versions of gcc in src and ports expect them to exist. Next I will move crtbegin.c into a new common machine-independent directory, and adjust the i386-elf Makefile to use that version. After that I will adjust the alpha Makefile to use the common version too. Requested by: obrien
2000-05-19 04:32:17 +00:00
* Copyright 1996, 1997, 1998, 2000 John D. Polstra.
Import C startup files for ELF support. Submitted by: John Polstra <jdp@polstra.com>
1998-03-07 20:27:11 +00:00
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
Let all .c and .S files under lib/csu consistently use the __FBSDID() macro for identification, instead of several different hand-rolled variants (plain .ident, .ascii, etc).
2010-12-09 21:31:21 +00:00
#include <machine/asm.h>
__FBSDID("$FreeBSD$");
* Bring back the guts of crt{i,n}.S. This allows C++ exceptions to work when using the egcs and gcc-devel ports, along with GCC built from stock public FSF sources. With out this change, FreeBSD will be removed from the list of systems GCC 3.0 must be evaluated on before release. With the effort some of us put into getting FreeBSD on this list, we should not turn this effort into a waste, else we might not be worth fighting for in the future. (note that Alpha and IA-64 versions of crt{i,n}.S are needed) * Switch from our own crt{begin,in} to those created from GCC's crtstuff.c. This will allow us to switch to DWARF2 exceptions in the future, along with staying in sync with any future GCC requirements. * Break out our ELF branding bits into a seperate file. Currently this is now included by our crt1.c files (since this functionality was part of our native crtbegin.c). Later crtbrand.o will be merged in the creation of crti.o.
2000-10-28 21:26:48 +00:00
.section .init,"ax",@progbits
Adjust stack alignment so that when the 'call xxx' functions are gathered into the middle of the _init and _fini sections, they get executed with their expected stack alignment.
2004-03-21 01:39:01 +00:00
addq $8,%rsp
* Bring back the guts of crt{i,n}.S. This allows C++ exceptions to work when using the egcs and gcc-devel ports, along with GCC built from stock public FSF sources. With out this change, FreeBSD will be removed from the list of systems GCC 3.0 must be evaluated on before release. With the effort some of us put into getting FreeBSD on this list, we should not turn this effort into a waste, else we might not be worth fighting for in the future. (note that Alpha and IA-64 versions of crt{i,n}.S are needed) * Switch from our own crt{begin,in} to those created from GCC's crtstuff.c. This will allow us to switch to DWARF2 exceptions in the future, along with staying in sync with any future GCC requirements. * Break out our ELF branding bits into a seperate file. Currently this is now included by our crt1.c files (since this functionality was part of our native crtbegin.c). Later crtbrand.o will be merged in the creation of crti.o.
2000-10-28 21:26:48 +00:00
ret
.section .fini,"ax",@progbits
Adjust stack alignment so that when the 'call xxx' functions are gathered into the middle of the _init and _fini sections, they get executed with their expected stack alignment.
2004-03-21 01:39:01 +00:00
addq $8,%rsp
* Bring back the guts of crt{i,n}.S. This allows C++ exceptions to work when using the egcs and gcc-devel ports, along with GCC built from stock public FSF sources. With out this change, FreeBSD will be removed from the list of systems GCC 3.0 must be evaluated on before release. With the effort some of us put into getting FreeBSD on this list, we should not turn this effort into a waste, else we might not be worth fighting for in the future. (note that Alpha and IA-64 versions of crt{i,n}.S are needed) * Switch from our own crt{begin,in} to those created from GCC's crtstuff.c. This will allow us to switch to DWARF2 exceptions in the future, along with staying in sync with any future GCC requirements. * Break out our ELF branding bits into a seperate file. Currently this is now included by our crt1.c files (since this functionality was part of our native crtbegin.c). Later crtbrand.o will be merged in the creation of crti.o.
2000-10-28 21:26:48 +00:00
ret
Add section .note.GNU-stack for assembly files used by 386 and amd64.
2011-01-07 16:07:51 +00:00
.section .note.GNU-stack,"",%progbits
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