1 /*- 2 * Copyright 1996, 1997, 1998, 2000 John D. Polstra. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 * 25 * $FreeBSD: src/lib/csu/common/crtbrand.c SVN 232832 2012/03/11 kib $ 26 */ 27 28 #include <sys/param.h> 29 #include "notes.h" 30 31 /* 32 * Special ".note" entry specifying the ABI version. See 33 * http://www.netbsd.org/Documentation/kernel/elf-notes.html 34 * for more information. 35 * 36 * For all arches except sparc, gcc emits the section directive for the 37 * following struct with a PROGBITS type. However, newer versions of binutils 38 * (after 2.16.90) require the section to be of NOTE type, to guarantee that the 39 * .note.ABI-tag section correctly ends up in the first page of the final 40 * executable. 41 * 42 * Unfortunately, there is no clean way to tell gcc to use another section type, 43 * so this C file (or the C file that includes it) must be compiled in multiple 44 * steps: 45 * 46 * - Compile the .c file to a .s file. 47 * - Edit the .s file to change the 'progbits' type to 'note', for the section 48 * directive that defines the .note.ABI-tag section. 49 * - Compile the .s file to an object file. 50 * 51 * These steps are done in the individual Makefiles for each applicable arch. 52 */ 53 static const struct { 54 int32_t namesz; 55 int32_t descsz; 56 int32_t type; 57 char name[sizeof(NOTE_VENDOR)]; 58 int32_t desc; 59 } abitag __attribute__ ((section (NOTE_SECTION), 60 aligned(4))) __attribute__ ((used)) = { 61 .namesz = sizeof(NOTE_VENDOR), 62 .descsz = sizeof(int32_t), 63 .type = ABI_NOTETYPE, 64 .name = NOTE_VENDOR, 65 .desc = __DragonFly_version 66 }; 67