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 2006 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 #pragma ident "%Z%%M% %I% %E% SMI" 27 28 #include <stdio.h> 29 #include <unistd.h> 30 #include <string.h> 31 #include <sys/systeminfo.h> 32 #include "_conv.h" 33 #include "arch_msg.h" 34 35 /* 36 * Determine if the 32-bit or 64-bit kernel is running. 37 * Return the corresponding EI_CLASS constant. 38 */ 39 int 40 conv_sys_eclass(void) 41 { 42 char buf[BUFSIZ]; 43 44 /* 45 * SI_ISALIST will return -1 on pre-2.6 machines, 46 * which is fine - it can't be a 64-bit kernel. 47 */ 48 if (sysinfo(SI_ISALIST, buf, BUFSIZ) == -1) 49 return (ELFCLASS32); 50 51 if ((strstr(buf, MSG_ORIG(MSG_ARCH_SPARCV9)) != NULL) || 52 (strstr(buf, MSG_ORIG(MSG_ARCH_AMD64)) != NULL)) 53 return (ELFCLASS64); 54 55 return (ELFCLASS32); 56 } 57 58 #if defined(_LP64) 59 /* ARGSUSED */ 60 uchar_t 61 conv_check_native(char **argv, char **envp) 62 { 63 /* 64-bit version does nothing */ 64 return (ELFCLASS64); 65 } 66 67 #else 68 69 /* 70 * Wrapper for isaexec(3c) that allows disabling 64-bit counterpart execution 71 * via setting LD_NOEXEC64=yes. 72 * 73 * The only callers are 32-bit sgs applications. These applications determine 74 * whether a 64-bit counterpart is available via this routine, and if not, 75 * control is passed back to the caller, who will then complete execution. 76 * Note, isaexec() will eventually fall through to looking for a 32-bit 77 * counterpart (ie. sparcv7, or sparc), but as none of the callers provide these 78 * counterparts, we simply return to the caller. 79 */ 80 uchar_t 81 conv_check_native(char **argv, char **envp) 82 { 83 char *str; 84 85 /* 86 * LD_NOEXEC_64 defined in the environment prevents the isaexec() call. 87 * This is used by the test suite to test 32-bit support libraries. 88 */ 89 if (((str = getenv(MSG_ORIG(MSG_LD_NOEXEC64))) != NULL) && *str) 90 return (ELFCLASS32); 91 92 (void) isaexec(getexecname(), argv, envp); 93 return (ELFCLASS32); 94 } 95 #endif 96