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      1 /*	$NetBSD: exec_elf32.c,v 1.144 2024/12/06 16:19:41 riastradh Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1996 Christopher G. Demetriou
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *      This product includes software developed by Christopher G. Demetriou
     18  *	for the NetBSD Project.
     19  * 4. The name of the author may not be used to endorse or promote products
     20  *    derived from this software without specific prior written permission
     21  *
     22  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     23  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     24  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     25  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     26  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     27  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     28  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     29  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     30  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     31  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     32  */
     33 
     34 #include <sys/cdefs.h>
     35 __KERNEL_RCSID(0, "$NetBSD: exec_elf32.c,v 1.144 2024/12/06 16:19:41 riastradh Exp $");
     36 
     37 #define	ELFSIZE	32
     38 
     39 #include "exec_elf.c"
     40 
     41 #include <sys/module.h>
     42 
     43 #define ELF32_AUXSIZE (ELF_AUX_ENTRIES * sizeof(Aux32Info) \
     44     + MAXPATHLEN + ALIGN(1))
     45 
     46 MODULE(MODULE_CLASS_EXEC, exec_elf32, NULL);
     47 
     48 static struct execsw exec_elf32_execsw[] = {
     49 	{
     50 		.es_hdrsz = sizeof (Elf32_Ehdr),
     51 	  	.es_makecmds = exec_elf32_makecmds,
     52 	  	.u = {
     53 			.elf_probe_func = netbsd_elf32_probe,
     54 		},
     55 		.es_emul = &emul_netbsd,
     56 		.es_prio = EXECSW_PRIO_FIRST,
     57 		.es_arglen = ELF32_AUXSIZE,
     58 		.es_copyargs = elf32_copyargs,
     59 		.es_setregs = NULL,
     60 		.es_coredump = coredump_elf32,
     61 		.es_setup_stack = exec_setup_stack,
     62 	},
     63 #if EXEC_ELF_NOTELESS
     64 	{
     65 		.es_hdrsz = sizeof (Elf32_Ehdr),
     66 	  	.es_makecmds = exec_elf32_makecmds,
     67 	  	.u {
     68 			elf_probe_func = NULL,
     69 		},
     70 		.es_emul = &emul_netbsd,
     71 		.es_prio = EXECSW_PRIO_LAST,
     72 		.es_arglen = ELF32_AUXSIZE,
     73 		.es_copyargs = elf32_copyargs,
     74 		.es_setregs = NULL,
     75 		.es_coredump = coredump_elf32,
     76 		.es_setup_stack = exec_setup_stack,
     77 	},
     78 #endif
     79 };
     80 
     81 static int
     82 exec_elf32_modcmd(modcmd_t cmd, void *arg)
     83 {
     84 #if ARCH_ELFSIZE == 64
     85 	/*
     86 	 * If we are on a 64bit system, we don't want the 32bit execsw[] to be
     87 	 * added in the global array, because the exec_elf32 module only works
     88 	 * on 32bit systems.
     89 	 *
     90 	 * However, we need the exec_elf32 module, because it will make the 32bit
     91 	 * functions available for netbsd32 and linux32.
     92 	 *
     93 	 * Therefore, allow this module on 64bit systems, but make it dormant.
     94 	 */
     95 
     96 	(void)exec_elf32_execsw; /* unused */
     97 
     98 	switch (cmd) {
     99 	case MODULE_CMD_INIT:
    100 	case MODULE_CMD_FINI:
    101 		return 0;
    102 	default:
    103 		return SET_ERROR(ENOTTY);
    104 	}
    105 #else /* ARCH_ELFSIZE == 64 */
    106 	switch (cmd) {
    107 	case MODULE_CMD_INIT:
    108 		return exec_add(exec_elf32_execsw,
    109 		    __arraycount(exec_elf32_execsw));
    110 
    111 	case MODULE_CMD_FINI:
    112 		return exec_remove(exec_elf32_execsw,
    113 		    __arraycount(exec_elf32_execsw));
    114 
    115 	default:
    116 		return SET_ERROR(ENOTTY);
    117         }
    118 #endif /* ARCH_ELFSIZE == 64 */
    119 }
    120