diff options
Diffstat (limited to 'lib/csu/common/crtbrand.c')
| -rw-r--r-- | lib/csu/common/crtbrand.c | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/lib/csu/common/crtbrand.c b/lib/csu/common/crtbrand.c new file mode 100644 index 0000000..444d7f1 --- /dev/null +++ b/lib/csu/common/crtbrand.c @@ -0,0 +1,69 @@ +/*- + * 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 <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/param.h> + +#define ABI_VENDOR "FreeBSD" +#define ABI_SECTION ".note.ABI-tag" +#define ABI_NOTETYPE 1 + +/* + * Special ".note" entry specifying the ABI version. See + * http://www.netbsd.org/Documentation/kernel/elf-notes.html + * for more information. + * + * For all arches except sparc, gcc emits the section directive for the + * following struct with a PROGBITS type. However, newer versions of binutils + * (after 2.16.90) require the section to be of NOTE type, to guarantee that the + * .note.ABI-tag section correctly ends up in the first page of the final + * executable. + * + * Unfortunately, there is no clean way to tell gcc to use another section type, + * so this C file (or the C file that includes it) must be compiled in multiple + * steps: + * + * - Compile the .c file to a .s file. + * - Edit the .s file to change the 'progbits' type to 'note', for the section + * directive that defines the .note.ABI-tag section. + * - Compile the .s file to an object file. + * + * These steps are done in the invididual Makefiles for each applicable arch. + */ +static const struct { + int32_t namesz; + int32_t descsz; + int32_t type; + char name[sizeof ABI_VENDOR]; + int32_t desc; +} abitag __attribute__ ((section (ABI_SECTION), aligned(4))) __used = { + sizeof ABI_VENDOR, + sizeof(int32_t), + ABI_NOTETYPE, + ABI_VENDOR, + __FreeBSD_version +}; |
