1/*- 2 * Copyright 2000 David E. O'Brien, 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 26#include <sys/cdefs.h> 27__FBSDID("$FreeBSD$"); 28 29#include <sys/param.h> 30 31#define ABI_VENDOR "FreeBSD" 32#define ABI_SECTION ".note.ABI-tag" 33#define ABI_NOTETYPE 1 34 35/* 36 * Special ".note" entry specifying the ABI version. See 37 * http://www.netbsd.org/Documentation/kernel/elf-notes.html 38 * for more information. 39 * 40 * For all arches except sparc, gcc emits the section directive for the 41 * following struct with a PROGBITS type. However, newer versions of binutils 42 * (after 2.16.90) require the section to be of NOTE type, to guarantee that the 43 * .note.ABI-tag section correctly ends up in the first page of the final 44 * executable. 45 * 46 * Unfortunately, there is no clean way to tell gcc to use another section type, 47 * so this C file (or the C file that includes it) must be compiled in multiple 48 * steps: 49 * 50 * - Compile the .c file to a .s file. 51 * - Edit the .s file to change the 'progbits' type to 'note', for the section 52 * directive that defines the .note.ABI-tag section. 53 * - Compile the .s file to an object file. 54 * 55 * These steps are done in the invididual Makefiles for each applicable arch. 56 */ 57static const struct { 58 int32_t namesz; 59 int32_t descsz; 60 int32_t type; 61 char name[sizeof ABI_VENDOR]; 62 int32_t desc; 63} abitag __attribute__ ((section (ABI_SECTION), aligned(4))) __used = { 64 sizeof ABI_VENDOR, 65 sizeof(int32_t), 66 ABI_NOTETYPE, 67 ABI_VENDOR, 68 903000 69}; 70