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Include ABI note tag in shared libraries.

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Split the ELF feature note into a separate file that is linked into
*crt1.o the same as crtbrand.S was before.  crtbrand.o is now linked
into crti.o on all platforms in addition to *crt1.o.

Reviewed by:	kib
Sponsored by:	DARPA
Differential Revision:	https://reviews.freebsd.org/D25304
This commit is contained in:
jhb 2020-07-16 21:58:43 +00:00
parent 3a60ca187b
commit 7eb6f1d269
3 changed files with 51 additions and 12 deletions
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9
lib/csu/Makefile.inc
View File

@ -13,7 +13,7 @@ OBJS+= crtbegin.o crtbeginS.o crtbeginT.o
OBJS+= crtend.o crtendS.o
OBJS+= crti.o crtn.o
CRT1OBJS+= crtbrand.o ignore_init_note.o
CRT1OBJS+= crtbrand.o feature_note.o ignore_init_note.o
ACFLAGS+= -DLOCORE
@ -33,6 +33,7 @@ FILESDIR= ${LIBDIR}
.undef LIBRARIES_ONLY
CLEANFILES+= ${OBJS} ${CRT1OBJS} crt1_c.o gcrt1_c.o Scrt1_c.o
CLEANFILES+= crti_s.o
crt1.o: crt1_c.o ${CRT1OBJS}
${LD} ${_LDFLAGS} -o ${.TARGET} -r ${.ALLSRC:M*.o}
@ -68,6 +69,12 @@ crtbeginS.o crtendS.o:
${CC} ${CFLAGS} -I${.CURDIR} ${CFLAGS_CRTS} -c -o ${.TARGET} \
${.ALLSRC:N*.h:[1]}
crti_s.o: crti.S
${CC} ${CFLAGS} ${ACFLAGS} -c ${.ALLSRC:M*.S} -o ${.TARGET}
crti.o: crti_s.o crtbrand.o
${LD} ${_LDFLAGS} -o ${.TARGET} -r ${.ALLSRC:M*.o}
.endif
.include "../Makefile.inc"

12
lib/csu/common/crtbrand.S
View File

@ -38,7 +38,7 @@ __FBSDID("$FreeBSD$");
* for more information.
*/
.section .note.tag,"a",%note
.section .note.tag,"aG",%note,.freebsd.noteG,comdat
.p2align 2
.4byte 2f-1f
.4byte 4f-3f
@ -46,14 +46,4 @@ __FBSDID("$FreeBSD$");
1: .asciz NOTE_FREEBSD_VENDOR
2: .p2align 2
3: .4byte __FreeBSD_version
4:
.section .note.tag,"a",%note
.p2align 2
.4byte 2f-1f
.4byte 4f-3f
.4byte NT_FREEBSD_FEATURE_CTL
1: .asciz NOTE_FREEBSD_VENDOR
2: .p2align 2
3: .4byte 0
4:

42
lib/csu/common/feature_note.S Normal file
View File

@ -0,0 +1,42 @@
/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright 2000 David E. O'Brien, John D. Polstra.
* 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.
*/
#include <machine/asm.h>
__FBSDID("$FreeBSD$");
#include <sys/elf_common.h>
#include "notes.h"
.section .note.tag,"a",%note
.p2align 2
.4byte 2f-1f
.4byte 4f-3f
.4byte NT_FREEBSD_FEATURE_CTL
1: .asciz NOTE_FREEBSD_VENDOR
2: .p2align 2
3: .4byte 0
4: