/*      $NetBSD: libelf_elfmachine.c,v 1.2 2024/03/03 17:37:34 christos Exp $   */

/*-
* Copyright (c) 2018 Joseph Koshy
* 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
*/

#if HAVE_NBTOOL_CONFIG_H
# include "nbtool_config.h"
#endif

#include <sys/cdefs.h>

#include <assert.h>
#include <libelf.h>

#include "_libelf.h"

__RCSID("$NetBSD: libelf_elfmachine.c,v 1.2 2024/03/03 17:37:34 christos Exp $");
ELFTC_VCSID("Id: libelf_elfmachine.c 3977 2022-05-01 06:45:34Z jkoshy");

/*
* A convenience helper that returns the ELF machine architecture for
* a ELF descriptor.
*/
int
_libelf_elfmachine(Elf *e)
{
       Elf32_Ehdr *eh32;
       Elf64_Ehdr *eh64;

       if (!e)
               return EM_NONE;

       assert(e->e_kind == ELF_K_ELF);
       assert(e->e_class != ELFCLASSNONE);

       eh32 = NULL;
       eh64 = NULL;

       switch (e->e_class) {
       case ELFCLASS32:
               eh32 = e->e_u.e_elf.e_ehdr.e_ehdr32;
               return eh32 ? eh32->e_machine : EM_NONE;
       case ELFCLASS64:
               eh64 = e->e_u.e_elf.e_ehdr.e_ehdr64;
               return eh64 ? eh64->e_machine : EM_NONE;
       }

       return (EM_NONE);
}