/*      $NetBSD: exec_elf32.c,v 1.144 2024/12/06 16:19:41 riastradh Exp $       */

/*
* Copyright (c) 1996 Christopher G. Demetriou
* 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.
* 3. All advertising materials mentioning features or use of this software
*    must display the following acknowledgement:
*      This product includes software developed by Christopher G. Demetriou
*      for the NetBSD Project.
* 4. The name of the author may not be used to endorse or promote products
*    derived from this software without specific prior written permission
*
* 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>
__KERNEL_RCSID(0, "$NetBSD: exec_elf32.c,v 1.144 2024/12/06 16:19:41 riastradh Exp $");

#define ELFSIZE 32

#include "exec_elf.c"

#include <sys/module.h>

#define ELF32_AUXSIZE (ELF_AUX_ENTRIES * sizeof(Aux32Info) \
   + MAXPATHLEN + ALIGN(1))

MODULE(MODULE_CLASS_EXEC, exec_elf32, NULL);

static struct execsw exec_elf32_execsw[] = {
       {
               .es_hdrsz = sizeof (Elf32_Ehdr),
               .es_makecmds = exec_elf32_makecmds,
               .u = {
                       .elf_probe_func = netbsd_elf32_probe,
               },
               .es_emul = &emul_netbsd,
               .es_prio = EXECSW_PRIO_FIRST,
               .es_arglen = ELF32_AUXSIZE,
               .es_copyargs = elf32_copyargs,
               .es_setregs = NULL,
               .es_coredump = coredump_elf32,
               .es_setup_stack = exec_setup_stack,
       },
#if EXEC_ELF_NOTELESS
       {
               .es_hdrsz = sizeof (Elf32_Ehdr),
               .es_makecmds = exec_elf32_makecmds,
               .u {
                       elf_probe_func = NULL,
               },
               .es_emul = &emul_netbsd,
               .es_prio = EXECSW_PRIO_LAST,
               .es_arglen = ELF32_AUXSIZE,
               .es_copyargs = elf32_copyargs,
               .es_setregs = NULL,
               .es_coredump = coredump_elf32,
               .es_setup_stack = exec_setup_stack,
       },
#endif
};

static int
exec_elf32_modcmd(modcmd_t cmd, void *arg)
{
#if ARCH_ELFSIZE == 64
       /*
        * If we are on a 64bit system, we don't want the 32bit execsw[] to be
        * added in the global array, because the exec_elf32 module only works
        * on 32bit systems.
        *
        * However, we need the exec_elf32 module, because it will make the 32bit
        * functions available for netbsd32 and linux32.
        *
        * Therefore, allow this module on 64bit systems, but make it dormant.
        */

       (void)exec_elf32_execsw; /* unused */

       switch (cmd) {
       case MODULE_CMD_INIT:
       case MODULE_CMD_FINI:
               return 0;
       default:
               return SET_ERROR(ENOTTY);
       }
#else /* ARCH_ELFSIZE == 64 */
       switch (cmd) {
       case MODULE_CMD_INIT:
               return exec_add(exec_elf32_execsw,
                   __arraycount(exec_elf32_execsw));

       case MODULE_CMD_FINI:
               return exec_remove(exec_elf32_execsw,
                   __arraycount(exec_elf32_execsw));

       default:
               return SET_ERROR(ENOTTY);
       }
#endif /* ARCH_ELFSIZE == 64 */
}