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      1 /*	$NetBSD: freebsd_mod.c,v 1.7 2019/02/05 00:40:15 pgoyette Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2008 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software developed for The NetBSD Foundation
      8  * by Andrew Doran.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 __KERNEL_RCSID(0, "$NetBSD: freebsd_mod.c,v 1.7 2019/02/05 00:40:15 pgoyette Exp $");
     34 
     35 #ifdef _KERNEL_OPT
     36 #include "opt_execfmt.h"
     37 #endif
     38 
     39 #include <sys/param.h>
     40 #include <sys/module.h>
     41 #include <sys/exec.h>
     42 #include <sys/exec_elf.h>
     43 #include <sys/signalvar.h>
     44 
     45 #include <compat/freebsd/freebsd_exec.h>
     46 #include <compat/freebsd/freebsd_sysctl.h>
     47 
     48 #if defined(EXEC_ELF32)
     49 # define	MD1	",exec_elf32"
     50 #else
     51 # define	MD1	""
     52 #endif
     53 
     54 #define ELF32_AUXSIZE (howmany(ELF_AUX_ENTRIES * sizeof(Aux32Info), \
     55     sizeof(Elf32_Addr)) + MAXPATHLEN + ALIGN(1))
     56 
     57 MODULE(MODULE_CLASS_EXEC, compat_freebsd, "compat_09,compat_ossaudio" MD1);
     58 
     59 static struct execsw freebsd_execsw[] = {
     60 #ifdef EXEC_ELF32
     61 	/* FreeBSD Elf32 (probe not 64-bit safe) */
     62 	{
     63 		.es_hdrsz = sizeof (Elf32_Ehdr),
     64 		.es_makecmds = exec_elf32_makecmds,
     65 		.u = {
     66 			.elf_probe_func = freebsd_elf32_probe,
     67 		},
     68 		.es_emul = &emul_freebsd,
     69 		.es_prio = EXECSW_PRIO_ANY,
     70 		.es_arglen = ELF32_AUXSIZE,
     71 		.es_copyargs = elf32_copyargs,
     72 		.es_setregs = NULL,
     73 		.es_coredump = coredump_elf32,
     74 		.es_setup_stack = exec_setup_stack,
     75 	},
     76 #endif
     77 };
     78 
     79 static int
     80 compat_freebsd_modcmd(modcmd_t cmd, void *arg)
     81 {
     82 	int error;
     83 
     84 	switch (cmd) {
     85 	case MODULE_CMD_INIT:
     86 		freebsd_sysctl_init();
     87 		error = exec_add(freebsd_execsw,
     88 		    __arraycount(freebsd_execsw));
     89 		if (error != 0)
     90 			freebsd_sysctl_fini();
     91 		return error;
     92 
     93 	case MODULE_CMD_FINI:
     94 		error = exec_remove(freebsd_execsw,
     95 		    __arraycount(freebsd_execsw));
     96 		if (error == 0)
     97 			freebsd_sysctl_fini();
     98 		return error;
     99 
    100 	default:
    101 		return ENOTTY;
    102 	}
    103 }
    104