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 /* The following trick defines int32_t w/o including <stdint.h> 27 We want "int" to be 4-byte. But just in case it isn't, the following 28 line turns into "typedef int int32_t[0]" and later fails with error messages 29 read like: 30 31 crtbrand.c:83: error: excess elements in struct initializer 32 */ 33 typedef int int32_t[sizeof(int) == 4]; 34 35 #define ABI_VENDOR "Android" 36 #define ABI_SECTION ".note.android.ident" 37 #define ABI_NOTETYPE 1 38 #define ABI_ANDROID_API PLATFORM_SDK_VERSION 39 40 /* 41 * Special ".note" entry to tag an Android binary and specify the ABI version. 42 * 43 * For all arches except sparc, gcc emits the section directive for the 44 * following struct with a PROGBITS type. However, the section should be 45 * of NOTE type, according to the Generic SysV ABI spec. 46 * 47 * Unfortunately, there is no clean way to tell gcc to use another section type, 48 * so this C file (or the C file that includes it) must be compiled in multiple 49 * steps: 50 * 51 * - Compile the .c file to a .s file. 52 * - Edit the .s file to change the 'progbits' type to 'note', for the section 53 * directive that defines the .note.ABI-tag section. 54 * - Compile the .s file to an object file. 55 * 56 * These steps are done in the invididual Makefiles for each applicable arch. 57 */ 58 static const struct { 59 int32_t namesz; 60 int32_t descsz; 61 int32_t type; 62 char name[sizeof ABI_VENDOR]; 63 int32_t android_api; 64 } abitag __attribute__ ((section (ABI_SECTION), aligned(4), used)) = { 65 sizeof ABI_VENDOR, 66 sizeof(int32_t), 67 ABI_NOTETYPE, 68 ABI_VENDOR, 69 ABI_ANDROID_API, 70 }; 71
