exec_elf32.c revision 1.142 
1/*	$NetBSD: exec_elf32.c,v 1.142 2017/01/25 17:56:45 christos 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 1.142 2017/01/25 17:56:45 christos 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#ifdef COREDUMP
47#define	DEP	"coredump"
48#else
49#define	DEP	NULL
50#endif
51
52MODULE(MODULE_CLASS_EXEC, exec_elf32, DEP);
53
54static struct execsw exec_elf32_execsw[] = {
55	{
56		.es_hdrsz = sizeof (Elf32_Ehdr),
57	  	.es_makecmds = exec_elf32_makecmds,
58	  	.u = {
59			.elf_probe_func = netbsd_elf32_probe,
60		},
61		.es_emul = &emul_netbsd,
62		.es_prio = EXECSW_PRIO_FIRST,
63		.es_arglen = ELF32_AUXSIZE,
64		.es_copyargs = elf32_copyargs,
65		.es_setregs = NULL,
66		.es_coredump = coredump_elf32,
67		.es_setup_stack = exec_setup_stack,
68	},
69#if EXEC_ELF_NOTELESS
70	{
71		.es_hdrsz = sizeof (Elf32_Ehdr),
72	  	.es_makecmds = exec_elf32_makecmds,
73	  	.u {
74			elf_probe_func = NULL,
75		},
76		.es_emul = &emul_netbsd,
77		.es_prio = EXECSW_PRIO_LAST,
78		.es_arglen = ELF32_AUXSIZE,
79		.es_copyargs = elf32_copyargs,
80		.es_setregs = NULL,
81		.es_coredump = coredump_elf32,
82		.es_setup_stack = exec_setup_stack,
83	},
84#endif
85};
86
87static int
88exec_elf32_modcmd(modcmd_t cmd, void *arg)
89{
90#if ARCH_ELFSIZE == 64
91	/*
92	 * If we are on a 64bit system, we don't want the 32bit execsw[] to be
93	 * added in the global array, because the exec_elf32 module only works
94	 * on 32bit systems.
95	 *
96	 * However, we need the exec_elf32 module, because it will make the 32bit
97	 * functions available for netbsd32 and linux32.
98	 *
99	 * Therefore, allow this module on 64bit systems, but make it dormant.
100	 */
101
102	(void)exec_elf32_execsw; /* unused */
103
104	switch (cmd) {
105	case MODULE_CMD_INIT:
106	case MODULE_CMD_FINI:
107		return 0;
108	default:
109		return ENOTTY;
110	}
111#else /* ARCH_ELFSIZE == 64 */
112	switch (cmd) {
113	case MODULE_CMD_INIT:
114		return exec_add(exec_elf32_execsw,
115		    __arraycount(exec_elf32_execsw));
116
117	case MODULE_CMD_FINI:
118		return exec_remove(exec_elf32_execsw,
119		    __arraycount(exec_elf32_execsw));
120
121	default:
122		return ENOTTY;
123        }
124#endif /* ARCH_ELFSIZE == 64 */
125}
126