[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__)) usage(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);
	printf(USAGE_HELP_OPTIONS(26));
	printf(USAGE_MAN_TAIL("setarch(8)"));

	exit(EXIT_SUCCESS);
}

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) {
		warnx(_("Not enough arguments"));
		errtryhelp(EXIT_FAILURE);
	}
	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':
			usage();
			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'"));
			/* fallthrough */
		default:
			errtryhelp(EXIT_FAILURE);
		}
	}

	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
7a87a774	87	static void __attribute__((__noreturn__)) usage(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	116	fputs(USAGE_SEPARATOR, stdout);
f45f3ec3	117	printf(USAGE_HELP_OPTIONS(26));
77eb13b9	118	printf(USAGE_MAN_TAIL("setarch(8)"));
26b0b857	119
77eb13b9	120	exit(EXIT_SUCCESS);
8b3a46d2 KZ	121	}
8b3a46d2 KZ	122
b446402b	123	static void __attribute__((__noreturn__))
77eb13b9	124	show_version(void)
b446402b	125	{
77eb13b9 SK	126	printf(UTIL_LINUX_VERSION);
77eb13b9 SK	127	exit(EXIT_SUCCESS);
b446402b	128	}
8df90dec	129
77eb13b9	130	static int set_arch(const char *pers, unsigned long options, int list)
8b3a46d2	131	{
77eb13b9 SK	132	struct utsname un;
	133	int i;
	134	unsigned long pers_value;
	135
	136	struct {
	137	int perval;
	138	const char target_arch, result_arch;
	139	} transitions[] = {
	140	{UNAME26, "uname26", NULL},
	141	{PER_LINUX32, "linux32", NULL},
	142	{PER_LINUX, "linux64", NULL},
8b3a46d2	143	#if defined(__powerpc__) \|\| defined(__powerpc64__)
77eb13b9 SK	144	# ifdef __BIG_ENDIAN__
	145	{PER_LINUX32, "ppc32", "ppc"},
	146	{PER_LINUX32, "ppc", "ppc"},
	147	{PER_LINUX, "ppc64", "ppc64"},
	148	{PER_LINUX, "ppc64pseries", "ppc64"},
	149	{PER_LINUX, "ppc64iseries", "ppc64"},
	150	# else
d9ca5dd4 RM	151	{PER_LINUX32, "ppc32le", "ppcle"},
	152	{PER_LINUX32, "ppcle", "ppcle"},
	153	{PER_LINUX, "ppc64le", "ppc64le"},
77eb13b9	154	# endif
8b3a46d2 KZ	155	#endif
8b3a46d2 KZ	156	#if defined(__x86_64__) \|\| defined(__i386__) \|\| defined(__ia64__)
77eb13b9 SK	157	{PER_LINUX32, "i386", "i386"},
	158	{PER_LINUX32, "i486", "i386"},
	159	{PER_LINUX32, "i586", "i386"},
	160	{PER_LINUX32, "i686", "i386"},
	161	{PER_LINUX32, "athlon", "i386"},
8b3a46d2 KZ	162	#endif
8b3a46d2 KZ	163	#if defined(__x86_64__) \|\| defined(__i386__)
77eb13b9	164	{PER_LINUX, "x86_64", "x86_64"},
8b3a46d2 KZ	165	#endif
8b3a46d2 KZ	166	#if defined(__ia64__) \|\| defined(__i386__)
77eb13b9	167	{PER_LINUX, "ia64", "ia64"},
8b3a46d2	168	#endif
782e198d	169	#if defined(__hppa__)
77eb13b9 SK	170	{PER_LINUX32, "parisc32", "parisc"},
	171	{PER_LINUX32, "parisc", "parisc"},
	172	{PER_LINUX, "parisc64", "parisc64"},
782e198d	173	#endif
8b3a46d2	174	#if defined(__s390x__) \|\| defined(__s390__)
77eb13b9 SK	175	{PER_LINUX32, "s390", "s390"},
77eb13b9 SK	176	{PER_LINUX, "s390x", "s390x"},
8b3a46d2 KZ	177	#endif
8b3a46d2 KZ	178	#if defined(__sparc64__) \|\| defined(__sparc__)
77eb13b9 SK	179	{PER_LINUX32, "sparc", "sparc"},
	180	{PER_LINUX32, "sparc32bash", "sparc"},
	181	{PER_LINUX32, "sparc32", "sparc"},
	182	{PER_LINUX, "sparc64", "sparc64"},
8b3a46d2 KZ	183	#endif
8b3a46d2 KZ	184	#if defined(__mips64__) \|\| defined(__mips__)
77eb13b9 SK	185	{PER_LINUX32, "mips32", "mips"},
	186	{PER_LINUX32, "mips", "mips"},
	187	{PER_LINUX, "mips64", "mips64"},
9e19737a BC	188	#endif
9e19737a BC	189	#if defined(__alpha__)
77eb13b9 SK	190	{PER_LINUX, "alpha", "alpha"},
	191	{PER_LINUX, "alphaev5", "alpha"},
	192	{PER_LINUX, "alphaev56", "alpha"},
	193	{PER_LINUX, "alphaev6", "alpha"},
	194	{PER_LINUX, "alphaev67", "alpha"},
8b3a46d2	195	#endif
77eb13b9 SK	196	/* place holder, will be filled up at runtime */
	197	{-1, NULL, NULL},
	198	{-1, NULL, NULL}
	199	};
	200
	201	/* Add the trivial transition {PER_LINUX, machine, machine} if no
	202	* such target_arch is hardcoded yet. */
	203	uname(&un);
	204	for (i = 0; transitions[i].perval >= 0; i++)
	205	if (!strcmp(un.machine, transitions[i].target_arch))
	206	break;
	207	if (transitions[i].perval < 0) {
	208	unsigned long wrdsz = CHAR_BIT * sizeof(void *);
	209	if (wrdsz == 32 \|\| wrdsz == 64) {
	210	/* fill up the place holder */
	211	transitions[i].perval = wrdsz == 32 ? PER_LINUX32 : PER_LINUX;
	212	transitions[i].target_arch = un.machine;
	213	transitions[i].result_arch = un.machine;
	214	}
ae2c3b5b	215	}
77eb13b9 SK	216	if (list) {
	217	for (i = 0; transitions[i].target_arch != NULL; i++)
	218	printf("%s\n", transitions[i].target_arch);
	219	return 0;
	220	}
	221	for (i = 0; transitions[i].perval >= 0; i++)
	222	if (!strcmp(pers, transitions[i].target_arch))
	223	break;
	224	if (transitions[i].perval < 0)
	225	errx(EXIT_FAILURE, _("%s: Unrecognized architecture"), pers);
	226	pers_value = transitions[i].perval \| options;
ae706576 DL	227	if (personality(pers_value) < 0) {
	228	/*
	229	* Depending on architecture and kernel version, personality
	230	* syscall is either capable or incapable of returning an error.
	231	* If the return value is not an error, then it's the previous
	232	* personality value, which can be an arbitrary value
	233	* undistinguishable from an error value.
	234	* To make things clear, a second call is needed.
	235	*/
	236	if (personality(pers_value) < 0)
	237	return 1;
	238	}
77eb13b9 SK	239	uname(&un);
	240	if (transitions[i].result_arch && strcmp(un.machine, transitions[i].result_arch)) {
	241	if (strcmp(transitions[i].result_arch, "i386")
	242	\|\| (strcmp(un.machine, "i486")
	243	&& strcmp(un.machine, "i586")
	244	&& strcmp(un.machine, "i686")
	245	&& strcmp(un.machine, "athlon")))
1e098672	246	errx(EXIT_FAILURE, _("Kernel cannot set architecture to %s"), pers);
77eb13b9 SK	247	}
77eb13b9 SK	248	return 0;
8b3a46d2 KZ	249	}
	250
	251	int main(int argc, char *argv[])
	252	{
5edb0ea6	253	const char *arch = NULL;
77eb13b9 SK	254	unsigned long options = 0;
	255	int verbose = 0;
	256	int c;
	257
5edb0ea6 KZ	258	/* Options without equivalent short options */
	259	enum {
	260	OPT_4GB = CHAR_MAX + 1,
	261	OPT_UNAME26,
	262	OPT_LIST
	263	};
	264
9e930041	265	/* Options --3gb and --4gb are for compatibility with an old
77eb13b9 SK	266	* Debian setarch implementation. */
	267	static const struct option longopts[] = {
	268	{"help", no_argument, NULL, 'h'},
	269	{"version", no_argument, NULL, 'V'},
	270	{"verbose", no_argument, NULL, 'v'},
	271	{"addr-no-randomize", no_argument, NULL, 'R'},
	272	{"fdpic-funcptrs", no_argument, NULL, 'F'},
	273	{"mmap-page-zero", no_argument, NULL, 'Z'},
	274	{"addr-compat-layout", no_argument, NULL, 'L'},
	275	{"read-implies-exec", no_argument, NULL, 'X'},
	276	{"32bit", no_argument, NULL, 'B'},
	277	{"short-inode", no_argument, NULL, 'I'},
	278	{"whole-seconds", no_argument, NULL, 'S'},
	279	{"sticky-timeouts", no_argument, NULL, 'T'},
	280	{"3gb", no_argument, NULL, '3'},
	281	{"4gb", no_argument, NULL, OPT_4GB},
	282	{"uname-2.6", no_argument, NULL, OPT_UNAME26},
5edb0ea6	283	{"list", no_argument, NULL, OPT_LIST},
77eb13b9 SK	284	{NULL, 0, NULL, 0}
	285	};
	286
	287	setlocale(LC_ALL, "");
	288	bindtextdomain(PACKAGE, LOCALEDIR);
	289	textdomain(PACKAGE);
	290	atexit(close_stdout);
	291
7a87a774 RM	292	if (argc < 1) {
	293	warnx(_("Not enough arguments"));
	294	errtryhelp(EXIT_FAILURE);
	295	}
5edb0ea6 KZ	296	archwrapper = strcmp(program_invocation_short_name, "setarch") != 0;
	297	if (archwrapper)
	298	arch = program_invocation_short_name; /* symlinks to setarch */
	299	else {
00b5ef70	300	if (1 < argc && *argv[1] != '-') {
5edb0ea6 KZ	301	arch = argv[1];
	302	argv[1] = argv[0]; /* for getopt_long() to get the program name */
	303	argv++;
	304	argc--;
77eb13b9 SK	305	}
77eb13b9 SK	306	}
5edb0ea6	307
77eb13b9	308	#if defined(__sparc64__) \|\| defined(__sparc__)
5edb0ea6 KZ	309	if (archwrapper && strcmp(arch, "sparc32bash") == 0) {
5edb0ea6 KZ	310	if (set_arch(arch, 0L, 0))
fcca5f1e	311	err(EXIT_FAILURE, _("Failed to set personality to %s"), arch);
77eb13b9 SK	312	execl("/bin/bash", NULL);
	313	err(EXIT_FAILURE, _("failed to execute %s"), "/bin/bash");
	314	}
	315	#endif
8b3a46d2	316
77eb13b9 SK	317	while ((c = getopt_long(argc, argv, "+hVv3BFILRSTXZ", longopts, NULL)) != -1) {
	318	switch (c) {
	319	case 'h':
7a87a774	320	usage();
77eb13b9 SK	321	break;
	322	case 'V':
	323	show_version();
	324	break;
	325	case 'v':
	326	verbose = 1;
	327	break;
	328	case 'R':
	329	turn_on(ADDR_NO_RANDOMIZE, options);
	330	break;
	331	case 'F':
	332	turn_on(FDPIC_FUNCPTRS, options);
	333	break;
	334	case 'Z':
	335	turn_on(MMAP_PAGE_ZERO, options);
	336	break;
	337	case 'L':
	338	turn_on(ADDR_COMPAT_LAYOUT, options);
	339	break;
	340	case 'X':
	341	turn_on(READ_IMPLIES_EXEC, options);
	342	break;
	343	case 'B':
	344	turn_on(ADDR_LIMIT_32BIT, options);
	345	break;
	346	case 'I':
	347	turn_on(SHORT_INODE, options);
	348	break;
	349	case 'S':
	350	turn_on(WHOLE_SECONDS, options);
	351	break;
	352	case 'T':
	353	turn_on(STICKY_TIMEOUTS, options);
	354	break;
	355	case '3':
	356	turn_on(ADDR_LIMIT_3GB, options);
	357	break;
	358	case OPT_4GB: /* just ignore this one */
	359	break;
	360	case OPT_UNAME26:
	361	turn_on(UNAME26, options);
	362	break;
5edb0ea6 KZ	363	case OPT_LIST:
	364	if (!archwrapper) {
	365	set_arch(NULL, 0, 1);
b2b5b502	366	return EXIT_SUCCESS;
5edb0ea6 KZ	367	} else
5edb0ea6 KZ	368	warnx(_("unrecognized option '--list'"));
9a8fada1	369	/* fallthrough */
77eb13b9	370	default:
677ec86c	371	errtryhelp(EXIT_FAILURE);
77eb13b9 SK	372	}
77eb13b9 SK	373	}
8b3a46d2	374
5edb0ea6 KZ	375	if (!arch)
	376	errx(EXIT_FAILURE, _("no architecture argument specified"));
	377
77eb13b9 SK	378	argc -= optind;
77eb13b9 SK	379	argv += optind;
8df90dec	380
5edb0ea6 KZ	381	if (set_arch(arch, options, 0))
5edb0ea6 KZ	382	err(EXIT_FAILURE, _("failed to set personality to %s"), arch);
8b3a46d2	383
9508e297 RM	384	if (verbose) {
	385	printf(_("Execute command `%s'.\n"), argc ? argv[0] : "/bin/sh");
	386	/* flush all output streams before exec */
	387	fflush(NULL);
	388	}
34c265f0	389
77eb13b9 SK	390	if (!argc) {
	391	execl("/bin/sh", "-sh", NULL);
	392	err(EXIT_FAILURE, _("failed to execute %s"), "/bin/sh");
	393	}
8b3a46d2	394
77eb13b9 SK	395	execvp(argv[0], argv);
	396	err(EXIT_FAILURE, "%s", argv[0]);
	397	return EXIT_FAILURE;
8b3a46d2	398	}