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linux_mod.c revision 1.4.4.2 
      1 /*	$NetBSD: linux_mod.c,v 1.4.4.2 2015/11/17 19:18:19 riz 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: linux_mod.c,v 1.4.4.2 2015/11/17 19:18:19 riz Exp $");
     34 
     35 #ifdef _KERNEL_OPT
     36 #include "opt_execfmt.h"
     37 #endif
     38 
     39 #ifndef ELFSIZE
     40 #define ELFSIZE ARCH_ELFSIZE
     41 #endif
     42 
     43 #include <sys/param.h>
     44 #include <sys/module.h>
     45 #include <sys/exec.h>
     46 #include <sys/signalvar.h>
     47 
     48 #include <compat/linux/common/linux_sysctl.h>
     49 #include <compat/linux/common/linux_futex.h>
     50 #include <compat/linux/common/linux_exec.h>
     51 
     52 #if defined(EXEC_ELF32) && ELFSIZE == 32
     53 # define	MD1	",exec_elf32"
     54 #else
     55 # define	MD1	""
     56 #endif
     57 #if defined(EXEC_ELF64)
     58 # define	MD2	",exec_elf64"
     59 #else
     60 # define	MD2	""
     61 #endif
     62 #if defined(EXEC_AOUT)
     63 #  define	MD3	",exec_aout"
     64 #else
     65 # define	MD3	""
     66 #endif
     67 
     68 MODULE(MODULE_CLASS_EXEC, compat_linux, "compat,compat_ossaudio" MD1 MD2 MD3);
     69 
     70 static struct execsw linux_execsw[] = {
     71 #if defined(EXEC_ELF32) && ELFSIZE == 32
     72 	{
     73 		.es_hdrsz = sizeof (Elf32_Ehdr),
     74 		.es_makecmds = exec_elf32_makecmds,
     75 		.u = {
     76 			.elf_probe_func = linux_elf32_probe,
     77 		},
     78 		.es_emul = &emul_linux,
     79 		.es_prio = EXECSW_PRIO_ANY,
     80 		.es_arglen = LINUX_ELF_AUX_ARGSIZ,
     81 		.es_copyargs = linux_elf32_copyargs,
     82 		.es_setregs = NULL,
     83 		.es_coredump = coredump_elf32,
     84 		.es_setup_stack = linux_exec_setup_stack,
     85 	},
     86 #elif defined(EXEC_ELF64)
     87 	{
     88 		.es_hdrsz = sizeof (Elf64_Ehdr),
     89 		.es_makecmds = exec_elf64_makecmds,
     90 		.u = {
     91 			.elf_probe_func = linux_elf64_probe,
     92 		},
     93 		.es_emul = &emul_linux,
     94 		.es_prio = EXECSW_PRIO_ANY,
     95 		.es_arglen = LINUX_ELF_AUX_ARGSIZ,
     96 		.es_copyargs = linux_elf64_copyargs,
     97 		.es_setregs = NULL,
     98  		.es_coredump = coredump_elf64,
     99 		.es_setup_stack = linux_exec_setup_stack,
    100 	},
    101 #endif
    102 #ifdef EXEC_AOUT
    103 	{
    104 		.es_hdrsz = LINUX_AOUT_HDR_SIZE,
    105 		.es_makecmds = exec_linux_aout_makecmds,
    106 		.u = {
    107 			.elf_probe_func = NULL,
    108 		},
    109 		.es_emul = &emul_linux,
    110 		.es_prio = EXECSW_PRIO_LAST,
    111 		.es_arglen = LINUX_AOUT_AUX_ARGSIZ,
    112 		.es_copyargs = linux_aout_copyargs,
    113 		.es_setregs = NULL,
    114 		.es_coredump = coredump_netbsd,
    115 		.es_setup_stack = linux_exec_setup_stack,
    116 	},
    117 #endif
    118 };
    119 
    120 static int
    121 compat_linux_modcmd(modcmd_t cmd, void *arg)
    122 {
    123 	int error;
    124 
    125 	switch (cmd) {
    126 	case MODULE_CMD_INIT:
    127 		linux_futex_init();
    128 		linux_sysctl_init();
    129 		error = exec_add(linux_execsw,
    130 		    __arraycount(linux_execsw));
    131 		if (error != 0)
    132 			linux_sysctl_fini();
    133 		return error;
    134 
    135 	case MODULE_CMD_FINI:
    136 		error = exec_remove(linux_execsw,
    137 		    __arraycount(linux_execsw));
    138 		if (error == 0) {
    139 			linux_sysctl_fini();
    140 			linux_futex_fini();
    141 		}
    142 		return error;
    143 
    144 	default:
    145 		return ENOTTY;
    146 	}
    147 }
    148