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      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 #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 	const 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 	if ((str = getexecname()) != NULL)
     93 		(void) isaexec(str, argv, envp);
     94 	return (ELFCLASS32);
     95 }
     96 #endif
     97