1: /* Special .init and .fini section support.
    2:    Copyright (C) 1997, 2001, 2002 Free Software Foundation, Inc.
    3:    This file is part of the GNU C Library.
    4: 
    5:    The GNU C Library is free software; you can redistribute it and/or
    6:    modify it under the terms of the GNU Lesser General Public
    7:    License as published by the Free Software Foundation; either
    8:    version 2.1 of the License, or (at your option) any later version.
    9: 
   10:    In addition to the permissions in the GNU Lesser General Public
   11:    License, the Free Software Foundation gives you unlimited
   12:    permission to link the compiled version of this file with other
   13:    programs, and to distribute those programs without any restriction
   14:    coming from the use of this file.  (The Lesser General Public
   15:    License restrictions do apply in other respects; for example, they
   16:    cover modification of the file, and distribution when not linked
   17:    into another program.)
   18: 
   19:    The GNU C Library is distributed in the hope that it will be useful,
   20:    but WITHOUT ANY WARRANTY; without even the implied warranty of
   21:    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   22:    Lesser General Public License for more details.
   23: 
   24:    You should have received a copy of the GNU Lesser General Public
   25:    License along with the GNU C Library; if not, write to the Free
   26:    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   27:    02111-1307 USA.  */
   28: 
   29: /* Define an ELF note identifying the operating-system ABI that the
   30:    executable was created for.  The ELF note information identifies a
   31:    particular OS or coordinated development effort within which the
   32:    ELF header's e_machine value plus (for dynamically linked programs)
   33:    the PT_INTERP dynamic linker name and DT_NEEDED shared library
   34:    names fully identify the runtime environment required by an
   35:    executable.
   36: 
   37:    The general format of ELF notes is as follows.
   38:    Offsets and lengths are bytes or (parenthetical references) to the
   39:    values in other fields.
   40: 
   41: offset  length   contents
   42: 0       4     length of name
   43: 4       4     length of data
   44: 8       4     note type
   45: 12      (0)  vendor name
   46:                 - null-terminated ASCII string, padded to 4-byte alignment
   47: 12+(0)  (4)      note data,
   48: 
   49:    The GNU project and cooperating development efforts (including the
   50:    Linux community) use note type 1 and a vendor name string of "GNU"
   51:    for a note descriptor that indicates ABI requirements.  The note data
   52:    is four 32-bit words.  The first of these is an operating system
   53:    number (0=Linux, 1=Hurd, 2=Solaris, ...) and the remaining three
   54:    identify the earliest release of that OS that supports this ABI.
   55:    See abi-tags (top level) for details. */
   56: 
   57: #include <config.h>
   58: #include <abi-tag.h>            /* OS-specific ABI tag value */
   59: 
   60: /* The linker (GNU ld 2.8 and later) recognizes an allocated section whose
   61:    name begins with `.note' and creates a PT_NOTE program header entry
   62:    pointing at it. */
   63: 
   64:         .section ".note.ABI-tag", "a"
   65:         .p2align 2
   66:         .long 1f - 0f          /* name length */
   67:         .long 3f - 2f          /* data length */
   68:         .long  1               /* note type */
   69: 0:      .asciz "GNU"         /* vendor name */
   70: 1:      .p2align 2
   71: 2:      .long __ABI_TAG_OS   /* note data: the ABI tag */
   72:         .long __ABI_TAG_VERSION
   73: 3:      .p2align 2           /* pad out section */