/*      $NetBSD: freebsd_mod.c,v 1.7 2019/02/05 00:40:15 pgoyette Exp $ */

/*-
* Copyright (c) 2008 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software developed for The NetBSD Foundation
* by Andrew Doran.
*
* 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: freebsd_mod.c,v 1.7 2019/02/05 00:40:15 pgoyette Exp $");

#ifdef _KERNEL_OPT
#include "opt_execfmt.h"
#endif

#include <sys/param.h>
#include <sys/module.h>
#include <sys/exec.h>
#include <sys/exec_elf.h>
#include <sys/signalvar.h>

#include <compat/freebsd/freebsd_exec.h>
#include <compat/freebsd/freebsd_sysctl.h>

#if defined(EXEC_ELF32)
# define        MD1     ",exec_elf32"
#else
# define        MD1     ""
#endif

#define ELF32_AUXSIZE (howmany(ELF_AUX_ENTRIES * sizeof(Aux32Info), \
   sizeof(Elf32_Addr)) + MAXPATHLEN + ALIGN(1))

MODULE(MODULE_CLASS_EXEC, compat_freebsd, "compat_09,compat_ossaudio" MD1);

static struct execsw freebsd_execsw[] = {
#ifdef EXEC_ELF32
       /* FreeBSD Elf32 (probe not 64-bit safe) */
       {
               .es_hdrsz = sizeof (Elf32_Ehdr),
               .es_makecmds = exec_elf32_makecmds,
               .u = {
                       .elf_probe_func = freebsd_elf32_probe,
               },
               .es_emul = &emul_freebsd,
               .es_prio = EXECSW_PRIO_ANY,
               .es_arglen = ELF32_AUXSIZE,
               .es_copyargs = elf32_copyargs,
               .es_setregs = NULL,
               .es_coredump = coredump_elf32,
               .es_setup_stack = exec_setup_stack,
       },
#endif
};

static int
compat_freebsd_modcmd(modcmd_t cmd, void *arg)
{
       int error;

       switch (cmd) {
       case MODULE_CMD_INIT:
               freebsd_sysctl_init();
               error = exec_add(freebsd_execsw,
                   __arraycount(freebsd_execsw));
               if (error != 0)
                       freebsd_sysctl_fini();
               return error;

       case MODULE_CMD_FINI:
               error = exec_remove(freebsd_execsw,
                   __arraycount(freebsd_execsw));
               if (error == 0)
                       freebsd_sysctl_fini();
               return error;

       default:
               return ENOTTY;
       }
}