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
exec_elf32_modcmd(modcmd_t cmd,void * arg)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