1/*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright 2000 David E. O'Brien, John D. Polstra. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28#include <sys/cdefs.h> 29__FBSDID("$FreeBSD$"); 30 31#include <sys/param.h> 32#include <sys/elf_common.h> 33#include "notes.h" 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(NOTE_FREEBSD_VENDOR)]; 62 int32_t desc; 63} abitag __attribute__ ((section (NOTE_SECTION), aligned(4))) __used = { 64 .namesz = sizeof(NOTE_FREEBSD_VENDOR), 65 .descsz = sizeof(int32_t), 66 .type = NT_FREEBSD_ABI_TAG, 67 .name = NOTE_FREEBSD_VENDOR, 68 .desc = __FreeBSD_version 69}; 70 71static const struct { 72 int32_t namesz; 73 int32_t descsz; 74 int32_t type; 75 char name[sizeof(NOTE_FREEBSD_VENDOR)]; 76 uint32_t desc[1]; 77} crt_feature_ctl __attribute__ ((section (NOTE_SECTION), 78 aligned(4))) __used = { 79 .namesz = sizeof(NOTE_FREEBSD_VENDOR), 80 .descsz = sizeof(uint32_t), 81 .type = NT_FREEBSD_FEATURE_CTL, 82 .name = NOTE_FREEBSD_VENDOR, 83 .desc = { 0 } 84}; 85