1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22 /*
23 * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 #include <stdio.h>
28 #include <unistd.h>
29 #include <string.h>
30 #include <sys/systeminfo.h>
31 #include "_conv.h"
32 #include "arch_msg.h"
33
34 /*
35 * Determine if the 32-bit or 64-bit kernel is running.
36 * Return the corresponding EI_CLASS constant.
37 */
38 int
conv_sys_eclass(void)39 conv_sys_eclass(void)
40 {
41 char buf[BUFSIZ];
42
43 /*
44 * SI_ISALIST will return -1 on pre-2.6 machines,
45 * which is fine - it can't be a 64-bit kernel.
46 */
47 if (sysinfo(SI_ISALIST, buf, BUFSIZ) == -1)
48 return (ELFCLASS32);
49
50 if ((strstr(buf, MSG_ORIG(MSG_ARCH_SPARCV9)) != NULL) ||
51 (strstr(buf, MSG_ORIG(MSG_ARCH_AMD64)) != NULL))
52 return (ELFCLASS64);
53
54 return (ELFCLASS32);
55 }
56
57 #if defined(_LP64)
58 /* ARGSUSED */
59 uchar_t
conv_check_native(char ** argv,char ** envp)60 conv_check_native(char **argv, char **envp)
61 {
62 /* 64-bit version does nothing */
63 return (ELFCLASS64);
64 }
65
66 #else
67
68 /*
69 * Wrapper for isaexec(3c) that allows disabling 64-bit counterpart execution
70 * via setting LD_NOEXEC64=yes.
71 *
72 * The only callers are 32-bit sgs applications. These applications determine
73 * whether a 64-bit counterpart is available via this routine, and if not,
74 * control is passed back to the caller, who will then complete execution.
75 * Note, isaexec() will eventually fall through to looking for a 32-bit
76 * counterpart (ie. sparcv7, or sparc), but as none of the callers provide these
77 * counterparts, we simply return to the caller.
78 */
79 uchar_t
conv_check_native(char ** argv,char ** envp)80 conv_check_native(char **argv, char **envp)
81 {
82 const char *str;
83
84 /*
85 * LD_NOEXEC_64 defined in the environment prevents the isaexec() call.
86 * This is used by the test suite to test 32-bit support libraries.
87 */
88 if (((str = getenv(MSG_ORIG(MSG_LD_NOEXEC64))) != NULL) && *str)
89 return (ELFCLASS32);
90
91 if ((str = getexecname()) != NULL)
92 (void) isaexec(str, argv, envp);
93 return (ELFCLASS32);
94 }
95 #endif
96