[thirdparty/util-linux.git] / sys-utils / setarch.c

/*
 * Copyright (C) 2003-2007 Red Hat, Inc.
 *
 * This file is part of util-linux.
 *
 * This file is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This file is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 *
 * Written by Elliot Lee <sopwith@redhat.com>
 * New personality options & code added by Jindrich Novy <jnovy@redhat.com>
 * ADD_NO_RANDOMIZE flag added by Arjan van de Ven <arjanv@redhat.com>
 * Help and MIPS support from Mike Frysinger (vapier@gentoo.org)
 * Better error handling from Dmitry V. Levin (ldv@altlinux.org)
 *
 * based on ideas from the ppc32 util by Guy Streeter (2002-01), based on the
 * sparc32 util by Jakub Jelinek (1998, 1999)
 */

#include <sys/personality.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <getopt.h>
#include <limits.h>
#include <sys/utsname.h>
#include "nls.h"
#include "c.h"
#include "closestream.h"

#ifndef HAVE_PERSONALITY
# include <syscall.h>
# define personality(pers) ((long)syscall(SYS_personality, pers))
#endif

#define turn_on(_flag, _opts) \
	do { \
		(_opts) |= _flag; \
		if (verbose) \
			printf(_("Switching on %s.\n"), #_flag); \
	} while(0)

#ifndef UNAME26
# define UNAME26                 0x0020000
#endif
#ifndef ADDR_NO_RANDOMIZE
# define ADDR_NO_RANDOMIZE       0x0040000
#endif
#ifndef FDPIC_FUNCPTRS
# define FDPIC_FUNCPTRS          0x0080000
#endif
#ifndef MMAP_PAGE_ZERO
# define MMAP_PAGE_ZERO          0x0100000
#endif
#ifndef ADDR_COMPAT_LAYOUT
# define ADDR_COMPAT_LAYOUT      0x0200000
#endif
#ifndef READ_IMPLIES_EXEC
# define READ_IMPLIES_EXEC       0x0400000
#endif
#ifndef ADDR_LIMIT_32BIT
# define ADDR_LIMIT_32BIT        0x0800000
#endif
#ifndef SHORT_INODE
# define SHORT_INODE             0x1000000
#endif
#ifndef WHOLE_SECONDS
# define WHOLE_SECONDS           0x2000000
#endif
#ifndef STICKY_TIMEOUTS
# define STICKY_TIMEOUTS         0x4000000
#endif
#ifndef ADDR_LIMIT_3GB
# define ADDR_LIMIT_3GB          0x8000000
#endif

static int archwrapper;

static void __attribute__((__noreturn__)) show_help(void)
{
	fputs(USAGE_HEADER, stdout);
	if (!archwrapper)
		printf(_(" %s <arch> [options] [<program> [<argument>...]]\n"), program_invocation_short_name);
	else
		printf(_(" %s [options] [<program> [<argument>...]]\n"), program_invocation_short_name);

	fputs(USAGE_SEPARATOR, stdout);
	fputs(_("Change the reported architecture and set personality flags.\n"), stdout);

	fputs(USAGE_OPTIONS, stdout);
	fputs(_(" -B, --32bit              turns on ADDR_LIMIT_32BIT\n"), stdout);
	fputs(_(" -F, --fdpic-funcptrs     makes function pointers point to descriptors\n"), stdout);
	fputs(_(" -I, --short-inode        turns on SHORT_INODE\n"), stdout);
	fputs(_(" -L, --addr-compat-layout changes the way virtual memory is allocated\n"), stdout);
	fputs(_(" -R, --addr-no-randomize  disables randomization of the virtual address space\n"), stdout);
	fputs(_(" -S, --whole-seconds      turns on WHOLE_SECONDS\n"), stdout);
	fputs(_(" -T, --sticky-timeouts    turns on STICKY_TIMEOUTS\n"), stdout);
	fputs(_(" -X, --read-implies-exec  turns on READ_IMPLIES_EXEC\n"), stdout);
	fputs(_(" -Z, --mmap-page-zero     turns on MMAP_PAGE_ZERO\n"), stdout);
	fputs(_(" -3, --3gb                limits the used address space to a maximum of 3 GB\n"), stdout);
	fputs(_("     --4gb                ignored (for backward compatibility only)\n"), stdout);
	fputs(_("     --uname-2.6          turns on UNAME26\n"), stdout);
	fputs(_(" -v, --verbose            say what options are being switched on\n"), stdout);

	if (!archwrapper)
		fputs(_("     --list               list settable architectures, and exit\n"), stdout);

	fputs(USAGE_SEPARATOR, stdout);
	fputs(USAGE_HELP, stdout);
	fputs(USAGE_VERSION, stdout);
	printf(USAGE_MAN_TAIL("setarch(8)"));

	exit(EXIT_SUCCESS);
}

static void __attribute__((__noreturn__)) show_usage(const char *s)
{
	if (s)
		errx(EXIT_FAILURE,
		     _("%s\nTry `%s --help' for more information."), s,
		     program_invocation_short_name);
	else
		errx(EXIT_FAILURE, _("Try `%s --help' for more information."),
		     program_invocation_short_name);
}

static void __attribute__((__noreturn__))
    show_version(void)
{
	printf(UTIL_LINUX_VERSION);
	exit(EXIT_SUCCESS);
}

static int set_arch(const char *pers, unsigned long options, int list)
{
	struct utsname un;
	int i;
	unsigned long pers_value;

	struct {
		int perval;
		const char *target_arch, *result_arch;
	} transitions[] = {
		{UNAME26,	"uname26",	NULL},
		{PER_LINUX32,	"linux32",	NULL},
		{PER_LINUX,	"linux64",	NULL},
#if defined(__powerpc__) || defined(__powerpc64__)
# ifdef __BIG_ENDIAN__
		{PER_LINUX32,	"ppc32",	"ppc"},
		{PER_LINUX32,	"ppc",		"ppc"},
		{PER_LINUX,	"ppc64",	"ppc64"},
		{PER_LINUX,	"ppc64pseries",	"ppc64"},
		{PER_LINUX,	"ppc64iseries",	"ppc64"},
# else
		{PER_LINUX32,	"ppc32le",	"ppcle"},
		{PER_LINUX32,	"ppcle",	"ppcle"},
		{PER_LINUX,	"ppc64le",	"ppc64le"},
# endif
#endif
#if defined(__x86_64__) || defined(__i386__) || defined(__ia64__)
		{PER_LINUX32,	"i386",		"i386"},
		{PER_LINUX32,	"i486",		"i386"},
		{PER_LINUX32,	"i586",		"i386"},
		{PER_LINUX32,	"i686",		"i386"},
		{PER_LINUX32,	"athlon",	"i386"},
#endif
#if defined(__x86_64__) || defined(__i386__)
		{PER_LINUX,	"x86_64",	"x86_64"},
#endif
#if defined(__ia64__) || defined(__i386__)
		{PER_LINUX,	"ia64",		"ia64"},
#endif
#if defined(__hppa__)
		{PER_LINUX32,	"parisc32",	"parisc"},
		{PER_LINUX32,	"parisc",	"parisc"},
		{PER_LINUX,	"parisc64",	"parisc64"},
#endif
#if defined(__s390x__) || defined(__s390__)
		{PER_LINUX32,	"s390",		"s390"},
		{PER_LINUX,	"s390x",	"s390x"},
#endif
#if defined(__sparc64__) || defined(__sparc__)
		{PER_LINUX32,	"sparc",	"sparc"},
		{PER_LINUX32,	"sparc32bash",	"sparc"},
		{PER_LINUX32,	"sparc32",	"sparc"},
		{PER_LINUX,	"sparc64",	"sparc64"},
#endif
#if defined(__mips64__) || defined(__mips__)
		{PER_LINUX32,	"mips32",	"mips"},
		{PER_LINUX32,	"mips",		"mips"},
		{PER_LINUX,	"mips64",	"mips64"},
#endif
#if defined(__alpha__)
		{PER_LINUX,	"alpha",	"alpha"},
		{PER_LINUX,	"alphaev5",	"alpha"},
		{PER_LINUX,	"alphaev56",	"alpha"},
		{PER_LINUX,	"alphaev6",	"alpha"},
		{PER_LINUX,	"alphaev67",	"alpha"},
#endif
		/* place holder, will be filled up at runtime */
		{-1,		NULL,		NULL},
		{-1,		NULL,		NULL}
	};

	/* Add the trivial transition {PER_LINUX, machine, machine} if no
	 * such target_arch is hardcoded yet.  */
	uname(&un);
	for (i = 0; transitions[i].perval >= 0; i++)
		if (!strcmp(un.machine, transitions[i].target_arch))
			break;
	if (transitions[i].perval < 0) {
		unsigned long wrdsz = CHAR_BIT * sizeof(void *);
		if (wrdsz == 32 || wrdsz == 64) {
			/* fill up the place holder */
			transitions[i].perval = wrdsz == 32 ? PER_LINUX32 : PER_LINUX;
			transitions[i].target_arch = un.machine;
			transitions[i].result_arch = un.machine;
		}
	}
	if (list) {
		for (i = 0; transitions[i].target_arch != NULL; i++)
			printf("%s\n", transitions[i].target_arch);
		return 0;
	}
	for (i = 0; transitions[i].perval >= 0; i++)
		if (!strcmp(pers, transitions[i].target_arch))
			break;
	if (transitions[i].perval < 0)
		errx(EXIT_FAILURE, _("%s: Unrecognized architecture"), pers);
	pers_value = transitions[i].perval | options;
	if (personality(pers_value) < 0) {
		/*
		 * Depending on architecture and kernel version, personality
		 * syscall is either capable or incapable of returning an error.
		 * If the return value is not an error, then it's the previous
		 * personality value, which can be an arbitrary value
		 * undistinguishable from an error value.
		 * To make things clear, a second call is needed.
		 */
		if (personality(pers_value) < 0)
			return 1;
	}
	uname(&un);
	if (transitions[i].result_arch && strcmp(un.machine, transitions[i].result_arch)) {
		if (strcmp(transitions[i].result_arch, "i386")
		    || (strcmp(un.machine, "i486")
			&& strcmp(un.machine, "i586")
			&& strcmp(un.machine, "i686")
			&& strcmp(un.machine, "athlon")))
			errx(EXIT_FAILURE, _("Kernel cannot set architecture to %s"), pers);
	}
	return 0;
}

int main(int argc, char *argv[])
{
	const char *arch = NULL;
	unsigned long options = 0;
	int verbose = 0;
	int c;

	/* Options without equivalent short options */
	enum {
		OPT_4GB = CHAR_MAX + 1,
		OPT_UNAME26,
		OPT_LIST
	};

	/* Options --3gb and --4gb are for compatibility with an old
	 * Debian setarch implementation.  */
	static const struct option longopts[] = {
		{"help",		no_argument,	NULL,	'h'},
		{"version",		no_argument,	NULL,	'V'},
		{"verbose",		no_argument,	NULL,	'v'},
		{"addr-no-randomize",	no_argument,	NULL,	'R'},
		{"fdpic-funcptrs",	no_argument,	NULL,	'F'},
		{"mmap-page-zero",	no_argument,	NULL,	'Z'},
		{"addr-compat-layout",	no_argument,	NULL,	'L'},
		{"read-implies-exec",	no_argument,	NULL,	'X'},
		{"32bit",		no_argument,	NULL,	'B'},
		{"short-inode",		no_argument,	NULL,	'I'},
		{"whole-seconds",	no_argument,	NULL,	'S'},
		{"sticky-timeouts",	no_argument,	NULL,	'T'},
		{"3gb",			no_argument,	NULL,	'3'},
		{"4gb",			no_argument,	NULL,	OPT_4GB},
		{"uname-2.6",		no_argument,	NULL,	OPT_UNAME26},
		{"list",		no_argument,	NULL,	OPT_LIST},
		{NULL,			0,		NULL,	0}
	};

	setlocale(LC_ALL, "");
	bindtextdomain(PACKAGE, LOCALEDIR);
	textdomain(PACKAGE);
	atexit(close_stdout);

	if (argc < 1)
		show_usage(_("Not enough arguments"));

	archwrapper = strcmp(program_invocation_short_name, "setarch") != 0;
	if (archwrapper)
		arch = program_invocation_short_name;	/* symlinks to setarch */
	else {
		if (1 < argc && *argv[1] != '-') {
			arch = argv[1];
			argv[1] = argv[0];	/* for getopt_long() to get the program name */
			argv++;
			argc--;
		}
	}

#if defined(__sparc64__) || defined(__sparc__)
	if (archwrapper && strcmp(arch, "sparc32bash") == 0) {
		if (set_arch(arch, 0L, 0))
			err(EXIT_FAILURE, _("Failed to set personality to %s"), arch);
		execl("/bin/bash", NULL);
		err(EXIT_FAILURE, _("failed to execute %s"), "/bin/bash");
	}
#endif

	while ((c = getopt_long(argc, argv, "+hVv3BFILRSTXZ", longopts, NULL)) != -1) {
		switch (c) {
		case 'h':
			show_help();
			break;
		case 'V':
			show_version();
			break;
		case 'v':
			verbose = 1;
			break;
		case 'R':
			turn_on(ADDR_NO_RANDOMIZE, options);
			break;
		case 'F':
			turn_on(FDPIC_FUNCPTRS, options);
			break;
		case 'Z':
			turn_on(MMAP_PAGE_ZERO, options);
			break;
		case 'L':
			turn_on(ADDR_COMPAT_LAYOUT, options);
			break;
		case 'X':
			turn_on(READ_IMPLIES_EXEC, options);
			break;
		case 'B':
			turn_on(ADDR_LIMIT_32BIT, options);
			break;
		case 'I':
			turn_on(SHORT_INODE, options);
			break;
		case 'S':
			turn_on(WHOLE_SECONDS, options);
			break;
		case 'T':
			turn_on(STICKY_TIMEOUTS, options);
			break;
		case '3':
			turn_on(ADDR_LIMIT_3GB, options);
			break;
		case OPT_4GB:	/* just ignore this one */
			break;
		case OPT_UNAME26:
			turn_on(UNAME26, options);
			break;
		case OPT_LIST:
			if (!archwrapper) {
				set_arch(NULL, 0, 1);
				return EXIT_SUCCESS;
			} else
				warnx(_("unrecognized option '--list'"));
		default:
			show_usage(NULL);
		}
	}

	if (!arch)
		errx(EXIT_FAILURE, _("no architecture argument specified"));

	argc -= optind;
	argv += optind;

	if (set_arch(arch, options, 0))
		err(EXIT_FAILURE, _("failed to set personality to %s"), arch);

	if (verbose) {
		printf(_("Execute command `%s'.\n"), argc ? argv[0] : "/bin/sh");
		/* flush all output streams before exec */
		fflush(NULL);
	}

	if (!argc) {
		execl("/bin/sh", "-sh", NULL);
		err(EXIT_FAILURE, _("failed to execute %s"), "/bin/sh");
	}

	execvp(argv[0], argv);
	err(EXIT_FAILURE, "%s", argv[0]);
	return EXIT_FAILURE;
}
Commit	Line	Data
8855c38d KZ	1	/*
	2	* Copyright (C) 2003-2007 Red Hat, Inc.
	3	*
601d12fb	4	* This file is part of util-linux.
8855c38d KZ	5	*
	6	* This file is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*
	11	* This file is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
8b3a46d2 KZ	16	*
	17	* Written by Elliot Lee <sopwith@redhat.com>
	18	* New personality options & code added by Jindrich Novy <jnovy@redhat.com>
	19	* ADD_NO_RANDOMIZE flag added by Arjan van de Ven <arjanv@redhat.com>
	20	* Help and MIPS support from Mike Frysinger (vapier@gentoo.org)
	21	* Better error handling from Dmitry V. Levin (ldv@altlinux.org)
	22	*
	23	* based on ideas from the ppc32 util by Guy Streeter (2002-01), based on the
	24	* sparc32 util by Jakub Jelinek (1998, 1999)
	25	*/
	26
9ed11cc2	27	#include <sys/personality.h>
8b3a46d2 KZ	28	#include <unistd.h>
	29	#include <stdio.h>
	30	#include <string.h>
	31	#include <stdlib.h>
8df90dec KZ	32	#include <getopt.h>
8df90dec KZ	33	#include <limits.h>
8b3a46d2	34	#include <sys/utsname.h>
a5b47e0a	35	#include "nls.h"
c60103a9	36	#include "c.h"
efb8854f	37	#include "closestream.h"
8b3a46d2	38
9ed11cc2 SK	39	#ifndef HAVE_PERSONALITY
	40	# include <syscall.h>
	41	# define personality(pers) ((long)syscall(SYS_personality, pers))
	42	#endif
8b3a46d2	43
8df90dec KZ	44	#define turn_on(_flag, _opts) \
	45	do { \
	46	(_opts) \|= _flag; \
	47	if (verbose) \
	48	printf(_("Switching on %s.\n"), #_flag); \
	49	} while(0)
	50
f29a3d18	51	#ifndef UNAME26
70eebc40 BH	52	# define UNAME26 0x0020000
70eebc40 BH	53	#endif
f29a3d18	54	#ifndef ADDR_NO_RANDOMIZE
2d281745 KZ	55	# define ADDR_NO_RANDOMIZE 0x0040000
2d281745 KZ	56	#endif
f29a3d18	57	#ifndef FDPIC_FUNCPTRS
2d281745 KZ	58	# define FDPIC_FUNCPTRS 0x0080000
2d281745 KZ	59	#endif
f29a3d18	60	#ifndef MMAP_PAGE_ZERO
2d281745 KZ	61	# define MMAP_PAGE_ZERO 0x0100000
2d281745 KZ	62	#endif
f29a3d18	63	#ifndef ADDR_COMPAT_LAYOUT
2d281745 KZ	64	# define ADDR_COMPAT_LAYOUT 0x0200000
2d281745 KZ	65	#endif
f29a3d18	66	#ifndef READ_IMPLIES_EXEC
2d281745 KZ	67	# define READ_IMPLIES_EXEC 0x0400000
2d281745 KZ	68	#endif
f29a3d18	69	#ifndef ADDR_LIMIT_32BIT
2d281745 KZ	70	# define ADDR_LIMIT_32BIT 0x0800000
2d281745 KZ	71	#endif
f29a3d18	72	#ifndef SHORT_INODE
2d281745 KZ	73	# define SHORT_INODE 0x1000000
2d281745 KZ	74	#endif
f29a3d18	75	#ifndef WHOLE_SECONDS
2d281745 KZ	76	# define WHOLE_SECONDS 0x2000000
2d281745 KZ	77	#endif
f29a3d18	78	#ifndef STICKY_TIMEOUTS
2d281745 KZ	79	# define STICKY_TIMEOUTS 0x4000000
2d281745 KZ	80	#endif
f29a3d18	81	#ifndef ADDR_LIMIT_3GB
2d281745 KZ	82	# define ADDR_LIMIT_3GB 0x8000000
	83	#endif
	84
5edb0ea6 KZ	85	static int archwrapper;
5edb0ea6 KZ	86
77eb13b9	87	static void __attribute__((__noreturn__)) show_help(void)
8b3a46d2	88	{
77eb13b9	89	fputs(USAGE_HEADER, stdout);
5edb0ea6	90	if (!archwrapper)
68243049 BS	91	printf(_(" %s <arch> [options] [<program> [<argument>...]]\n"), program_invocation_short_name);
	92	else
	93	printf(_(" %s [options] [<program> [<argument>...]]\n"), program_invocation_short_name);
451dbcfa BS	94
	95	fputs(USAGE_SEPARATOR, stdout);
	96	fputs(_("Change the reported architecture and set personality flags.\n"), stdout);
	97
77eb13b9	98	fputs(USAGE_OPTIONS, stdout);
77eb13b9	99	fputs(_(" -B, --32bit turns on ADDR_LIMIT_32BIT\n"), stdout);
26b0b857	100	fputs(_(" -F, --fdpic-funcptrs makes function pointers point to descriptors\n"), stdout);
77eb13b9	101	fputs(_(" -I, --short-inode turns on SHORT_INODE\n"), stdout);
26b0b857 BS	102	fputs(_(" -L, --addr-compat-layout changes the way virtual memory is allocated\n"), stdout);
26b0b857 BS	103	fputs(_(" -R, --addr-no-randomize disables randomization of the virtual address space\n"), stdout);
77eb13b9 SK	104	fputs(_(" -S, --whole-seconds turns on WHOLE_SECONDS\n"), stdout);
77eb13b9 SK	105	fputs(_(" -T, --sticky-timeouts turns on STICKY_TIMEOUTS\n"), stdout);
26b0b857 BS	106	fputs(_(" -X, --read-implies-exec turns on READ_IMPLIES_EXEC\n"), stdout);
26b0b857 BS	107	fputs(_(" -Z, --mmap-page-zero turns on MMAP_PAGE_ZERO\n"), stdout);
77eb13b9 SK	108	fputs(_(" -3, --3gb limits the used address space to a maximum of 3 GB\n"), stdout);
	109	fputs(_(" --4gb ignored (for backward compatibility only)\n"), stdout);
	110	fputs(_(" --uname-2.6 turns on UNAME26\n"), stdout);
26b0b857	111	fputs(_(" -v, --verbose say what options are being switched on\n"), stdout);
5edb0ea6 KZ	112
	113	if (!archwrapper)
	114	fputs(_(" --list list settable architectures, and exit\n"), stdout);
26b0b857	115
77eb13b9 SK	116	fputs(USAGE_SEPARATOR, stdout);
	117	fputs(USAGE_HELP, stdout);
	118	fputs(USAGE_VERSION, stdout);
	119	printf(USAGE_MAN_TAIL("setarch(8)"));
26b0b857	120
77eb13b9	121	exit(EXIT_SUCCESS);
8b3a46d2 KZ	122	}
8b3a46d2 KZ	123
77eb13b9	124	static void __attribute__((__noreturn__)) show_usage(const char *s)
8b3a46d2	125	{
77eb13b9 SK	126	if (s)
	127	errx(EXIT_FAILURE,
	128	_("%s\nTry `%s --help' for more information."), s,
	129	program_invocation_short_name);
	130	else
	131	errx(EXIT_FAILURE, _("Try `%s --help' for more information."),
	132	program_invocation_short_name);
8b3a46d2 KZ	133	}
8b3a46d2 KZ	134
b446402b	135	static void __attribute__((__noreturn__))
77eb13b9	136	show_version(void)
b446402b	137	{
77eb13b9 SK	138	printf(UTIL_LINUX_VERSION);
77eb13b9 SK	139	exit(EXIT_SUCCESS);
b446402b	140	}
8df90dec	141
77eb13b9	142	static int set_arch(const char *pers, unsigned long options, int list)
8b3a46d2	143	{
77eb13b9 SK	144	struct utsname un;
	145	int i;
	146	unsigned long pers_value;
	147
	148	struct {
	149	int perval;
	150	const char target_arch, result_arch;
	151	} transitions[] = {
	152	{UNAME26, "uname26", NULL},
	153	{PER_LINUX32, "linux32", NULL},
	154	{PER_LINUX, "linux64", NULL},
8b3a46d2	155	#if defined(__powerpc__) \|\| defined(__powerpc64__)
77eb13b9 SK	156	# ifdef __BIG_ENDIAN__
	157	{PER_LINUX32, "ppc32", "ppc"},
	158	{PER_LINUX32, "ppc", "ppc"},
	159	{PER_LINUX, "ppc64", "ppc64"},
	160	{PER_LINUX, "ppc64pseries", "ppc64"},
	161	{PER_LINUX, "ppc64iseries", "ppc64"},
	162	# else
d9ca5dd4 RM	163	{PER_LINUX32, "ppc32le", "ppcle"},
	164	{PER_LINUX32, "ppcle", "ppcle"},
	165	{PER_LINUX, "ppc64le", "ppc64le"},
77eb13b9	166	# endif
8b3a46d2 KZ	167	#endif
8b3a46d2 KZ	168	#if defined(__x86_64__) \|\| defined(__i386__) \|\| defined(__ia64__)
77eb13b9 SK	169	{PER_LINUX32, "i386", "i386"},
	170	{PER_LINUX32, "i486", "i386"},
	171	{PER_LINUX32, "i586", "i386"},
	172	{PER_LINUX32, "i686", "i386"},
	173	{PER_LINUX32, "athlon", "i386"},
8b3a46d2 KZ	174	#endif
8b3a46d2 KZ	175	#if defined(__x86_64__) \|\| defined(__i386__)
77eb13b9	176	{PER_LINUX, "x86_64", "x86_64"},
8b3a46d2 KZ	177	#endif
8b3a46d2 KZ	178	#if defined(__ia64__) \|\| defined(__i386__)
77eb13b9	179	{PER_LINUX, "ia64", "ia64"},
8b3a46d2	180	#endif
782e198d	181	#if defined(__hppa__)
77eb13b9 SK	182	{PER_LINUX32, "parisc32", "parisc"},
	183	{PER_LINUX32, "parisc", "parisc"},
	184	{PER_LINUX, "parisc64", "parisc64"},
782e198d	185	#endif
8b3a46d2	186	#if defined(__s390x__) \|\| defined(__s390__)
77eb13b9 SK	187	{PER_LINUX32, "s390", "s390"},
77eb13b9 SK	188	{PER_LINUX, "s390x", "s390x"},
8b3a46d2 KZ	189	#endif
8b3a46d2 KZ	190	#if defined(__sparc64__) \|\| defined(__sparc__)
77eb13b9 SK	191	{PER_LINUX32, "sparc", "sparc"},
	192	{PER_LINUX32, "sparc32bash", "sparc"},
	193	{PER_LINUX32, "sparc32", "sparc"},
	194	{PER_LINUX, "sparc64", "sparc64"},
8b3a46d2 KZ	195	#endif
8b3a46d2 KZ	196	#if defined(__mips64__) \|\| defined(__mips__)
77eb13b9 SK	197	{PER_LINUX32, "mips32", "mips"},
	198	{PER_LINUX32, "mips", "mips"},
	199	{PER_LINUX, "mips64", "mips64"},
9e19737a BC	200	#endif
9e19737a BC	201	#if defined(__alpha__)
77eb13b9 SK	202	{PER_LINUX, "alpha", "alpha"},
	203	{PER_LINUX, "alphaev5", "alpha"},
	204	{PER_LINUX, "alphaev56", "alpha"},
	205	{PER_LINUX, "alphaev6", "alpha"},
	206	{PER_LINUX, "alphaev67", "alpha"},
8b3a46d2	207	#endif
77eb13b9 SK	208	/* place holder, will be filled up at runtime */
	209	{-1, NULL, NULL},
	210	{-1, NULL, NULL}
	211	};
	212
	213	/* Add the trivial transition {PER_LINUX, machine, machine} if no
	214	* such target_arch is hardcoded yet. */
	215	uname(&un);
	216	for (i = 0; transitions[i].perval >= 0; i++)
	217	if (!strcmp(un.machine, transitions[i].target_arch))
	218	break;
	219	if (transitions[i].perval < 0) {
	220	unsigned long wrdsz = CHAR_BIT * sizeof(void *);
	221	if (wrdsz == 32 \|\| wrdsz == 64) {
	222	/* fill up the place holder */
	223	transitions[i].perval = wrdsz == 32 ? PER_LINUX32 : PER_LINUX;
	224	transitions[i].target_arch = un.machine;
	225	transitions[i].result_arch = un.machine;
	226	}
ae2c3b5b	227	}
77eb13b9 SK	228	if (list) {
	229	for (i = 0; transitions[i].target_arch != NULL; i++)
	230	printf("%s\n", transitions[i].target_arch);
	231	return 0;
	232	}
	233	for (i = 0; transitions[i].perval >= 0; i++)
	234	if (!strcmp(pers, transitions[i].target_arch))
	235	break;
	236	if (transitions[i].perval < 0)
	237	errx(EXIT_FAILURE, _("%s: Unrecognized architecture"), pers);
	238	pers_value = transitions[i].perval \| options;
ae706576 DL	239	if (personality(pers_value) < 0) {
	240	/*
	241	* Depending on architecture and kernel version, personality
	242	* syscall is either capable or incapable of returning an error.
	243	* If the return value is not an error, then it's the previous
	244	* personality value, which can be an arbitrary value
	245	* undistinguishable from an error value.
	246	* To make things clear, a second call is needed.
	247	*/
	248	if (personality(pers_value) < 0)
	249	return 1;
	250	}
77eb13b9 SK	251	uname(&un);
	252	if (transitions[i].result_arch && strcmp(un.machine, transitions[i].result_arch)) {
	253	if (strcmp(transitions[i].result_arch, "i386")
	254	\|\| (strcmp(un.machine, "i486")
	255	&& strcmp(un.machine, "i586")
	256	&& strcmp(un.machine, "i686")
	257	&& strcmp(un.machine, "athlon")))
1e098672	258	errx(EXIT_FAILURE, _("Kernel cannot set architecture to %s"), pers);
77eb13b9 SK	259	}
77eb13b9 SK	260	return 0;
8b3a46d2 KZ	261	}
	262
	263	int main(int argc, char *argv[])
	264	{
5edb0ea6	265	const char *arch = NULL;
77eb13b9 SK	266	unsigned long options = 0;
	267	int verbose = 0;
	268	int c;
	269
5edb0ea6 KZ	270	/* Options without equivalent short options */
	271	enum {
	272	OPT_4GB = CHAR_MAX + 1,
	273	OPT_UNAME26,
	274	OPT_LIST
	275	};
	276
9e930041	277	/* Options --3gb and --4gb are for compatibility with an old
77eb13b9 SK	278	* Debian setarch implementation. */
	279	static const struct option longopts[] = {
	280	{"help", no_argument, NULL, 'h'},
	281	{"version", no_argument, NULL, 'V'},
	282	{"verbose", no_argument, NULL, 'v'},
	283	{"addr-no-randomize", no_argument, NULL, 'R'},
	284	{"fdpic-funcptrs", no_argument, NULL, 'F'},
	285	{"mmap-page-zero", no_argument, NULL, 'Z'},
	286	{"addr-compat-layout", no_argument, NULL, 'L'},
	287	{"read-implies-exec", no_argument, NULL, 'X'},
	288	{"32bit", no_argument, NULL, 'B'},
	289	{"short-inode", no_argument, NULL, 'I'},
	290	{"whole-seconds", no_argument, NULL, 'S'},
	291	{"sticky-timeouts", no_argument, NULL, 'T'},
	292	{"3gb", no_argument, NULL, '3'},
	293	{"4gb", no_argument, NULL, OPT_4GB},
	294	{"uname-2.6", no_argument, NULL, OPT_UNAME26},
5edb0ea6	295	{"list", no_argument, NULL, OPT_LIST},
77eb13b9 SK	296	{NULL, 0, NULL, 0}
	297	};
	298
	299	setlocale(LC_ALL, "");
	300	bindtextdomain(PACKAGE, LOCALEDIR);
	301	textdomain(PACKAGE);
	302	atexit(close_stdout);
	303
	304	if (argc < 1)
	305	show_usage(_("Not enough arguments"));
	306
5edb0ea6 KZ	307	archwrapper = strcmp(program_invocation_short_name, "setarch") != 0;
	308	if (archwrapper)
	309	arch = program_invocation_short_name; /* symlinks to setarch */
	310	else {
00b5ef70	311	if (1 < argc && *argv[1] != '-') {
5edb0ea6 KZ	312	arch = argv[1];
	313	argv[1] = argv[0]; /* for getopt_long() to get the program name */
	314	argv++;
	315	argc--;
77eb13b9 SK	316	}
77eb13b9 SK	317	}
5edb0ea6	318
77eb13b9	319	#if defined(__sparc64__) \|\| defined(__sparc__)
5edb0ea6 KZ	320	if (archwrapper && strcmp(arch, "sparc32bash") == 0) {
5edb0ea6 KZ	321	if (set_arch(arch, 0L, 0))
fcca5f1e	322	err(EXIT_FAILURE, _("Failed to set personality to %s"), arch);
77eb13b9 SK	323	execl("/bin/bash", NULL);
	324	err(EXIT_FAILURE, _("failed to execute %s"), "/bin/bash");
	325	}
	326	#endif
8b3a46d2	327
77eb13b9 SK	328	while ((c = getopt_long(argc, argv, "+hVv3BFILRSTXZ", longopts, NULL)) != -1) {
	329	switch (c) {
	330	case 'h':
	331	show_help();
	332	break;
	333	case 'V':
	334	show_version();
	335	break;
	336	case 'v':
	337	verbose = 1;
	338	break;
	339	case 'R':
	340	turn_on(ADDR_NO_RANDOMIZE, options);
	341	break;
	342	case 'F':
	343	turn_on(FDPIC_FUNCPTRS, options);
	344	break;
	345	case 'Z':
	346	turn_on(MMAP_PAGE_ZERO, options);
	347	break;
	348	case 'L':
	349	turn_on(ADDR_COMPAT_LAYOUT, options);
	350	break;
	351	case 'X':
	352	turn_on(READ_IMPLIES_EXEC, options);
	353	break;
	354	case 'B':
	355	turn_on(ADDR_LIMIT_32BIT, options);
	356	break;
	357	case 'I':
	358	turn_on(SHORT_INODE, options);
	359	break;
	360	case 'S':
	361	turn_on(WHOLE_SECONDS, options);
	362	break;
	363	case 'T':
	364	turn_on(STICKY_TIMEOUTS, options);
	365	break;
	366	case '3':
	367	turn_on(ADDR_LIMIT_3GB, options);
	368	break;
	369	case OPT_4GB: /* just ignore this one */
	370	break;
	371	case OPT_UNAME26:
	372	turn_on(UNAME26, options);
	373	break;
5edb0ea6 KZ	374	case OPT_LIST:
	375	if (!archwrapper) {
	376	set_arch(NULL, 0, 1);
b2b5b502	377	return EXIT_SUCCESS;
5edb0ea6 KZ	378	} else
5edb0ea6 KZ	379	warnx(_("unrecognized option '--list'"));
77eb13b9 SK	380	default:
	381	show_usage(NULL);
	382	}
	383	}
8b3a46d2	384
5edb0ea6 KZ	385	if (!arch)
	386	errx(EXIT_FAILURE, _("no architecture argument specified"));
	387
77eb13b9 SK	388	argc -= optind;
77eb13b9 SK	389	argv += optind;
8df90dec	390
5edb0ea6 KZ	391	if (set_arch(arch, options, 0))
5edb0ea6 KZ	392	err(EXIT_FAILURE, _("failed to set personality to %s"), arch);
8b3a46d2	393
9508e297 RM	394	if (verbose) {
	395	printf(_("Execute command `%s'.\n"), argc ? argv[0] : "/bin/sh");
	396	/* flush all output streams before exec */
	397	fflush(NULL);
	398	}
34c265f0	399
77eb13b9 SK	400	if (!argc) {
	401	execl("/bin/sh", "-sh", NULL);
	402	err(EXIT_FAILURE, _("failed to execute %s"), "/bin/sh");
	403	}
8b3a46d2	404
77eb13b9 SK	405	execvp(argv[0], argv);
	406	err(EXIT_FAILURE, "%s", argv[0]);
	407	return EXIT_FAILURE;
8b3a46d2	408	}