[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


struct arch_domain {
	int		perval;		/* PER_* */
	const char	*target_arch;
	const char	*result_arch;
};


static void __attribute__((__noreturn__)) usage(int archwrapper)
{
	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);
}

/*
 * Returns inilialized list of all available execution domains.
 */
static struct arch_domain *init_arch_domains(void)
{
	static struct utsname un;
	size_t i;

	static struct arch_domain 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,	"ppc32",	"ppcle"},
		{PER_LINUX32,	"ppc",		"ppcle"},
		{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
#if defined(__e2k__)
		{PER_LINUX,	"e2k",      "e2k"},
		{PER_LINUX,	"e2kv4",	"e2k"},
		{PER_LINUX,	"e2kv5",	"e2k"},
		{PER_LINUX,	"e2kv6",	"e2k"},
		{PER_LINUX,	"e2k4c",	"e2k"},
		{PER_LINUX,	"e2k8c",	"e2k"},
		{PER_LINUX,	"e2k1cp",	"e2k"},
		{PER_LINUX,	"e2k8c2",	"e2k"},
		{PER_LINUX,	"e2k12c",	"e2k"},
		{PER_LINUX,	"e2k16c",	"e2k"},
		{PER_LINUX,	"e2k2c3",	"e2k"},
#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;
		}
	}

	return transitions;
}

/*
 * List all execution domains from transitions
 */
static void list_arch_domains(struct arch_domain *doms)
{
	struct arch_domain *d;

	for (d = doms; d->target_arch != NULL; d++)
		printf("%s\n", d->target_arch);
}

static struct arch_domain *get_arch_domain(struct arch_domain *doms, const char *pers)
{
	struct arch_domain *d;

	for (d = doms; d && d->perval >= 0; d++) {
		if (!strcmp(pers, d->target_arch))
			break;
	}

	return !d || d->perval < 0 ? NULL : d;
}

static void verify_arch_domain(struct arch_domain *dom, const char *wanted)
{
	struct utsname un;

	if (!dom || !dom->result_arch)
		return;

	uname(&un);
	if (strcmp(un.machine, dom->result_arch)) {
		if (strcmp(dom->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"), wanted);
	}
}

int main(int argc, char *argv[])
{
	const char *arch = NULL;
	unsigned long options = 0;
	int verbose = 0;
	int archwrapper;
	int c;
	struct arch_domain *doms, *target = NULL;
	unsigned long pers_value = 0;
	char *shell = NULL, *shell_arg = NULL;

	/* 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);
	close_stdout_atexit();

	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 */

		/* Don't use ifdef sparc here, we get "Unrecognized architecture"
		 * error message later if necessary */
		if (strcmp(arch, "sparc32bash") == 0) {
			shell = "/bin/bash";
			shell_arg = "";
			goto set_arch;
		}
	} else {
		if (1 < argc && *argv[1] != '-') {
			arch = argv[1];
			argv[1] = argv[0];	/* for getopt_long() to get the program name */
			argv++;
			argc--;
		}
	}

	while ((c = getopt_long(argc, argv, "+hVv3BFILRSTXZ", longopts, NULL)) != -1) {
		switch (c) {
		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) {
				list_arch_domains(init_arch_domains());
				return EXIT_SUCCESS;
			} else
				warnx(_("unrecognized option '--list'"));
			/* fallthrough */

		default:
			errtryhelp(EXIT_FAILURE);
		case 'h':
			usage(archwrapper);
		case 'V':
			print_version(EXIT_SUCCESS);
		}
	}

	if (!arch && !options)
		errx(EXIT_FAILURE, _("no architecture argument or personality flags specified"));

	argc -= optind;
	argv += optind;

set_arch:
	/* get execution domain (architecture) */
	if (arch) {
		doms = init_arch_domains();
		target = get_arch_domain(doms, arch);

		if (!target)
			errx(EXIT_FAILURE, _("%s: Unrecognized architecture"), arch);
		pers_value = target->perval;
	}

	/* add personality flags */
	pers_value |= options;

	/* call kernel */
	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)
			err(EXIT_FAILURE, _("failed to set personality to %s"), arch);
	}

	/* make sure architecture is set as expected */
	if (arch)
		verify_arch_domain(target, arch);

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

	/* Execute shell */
	if (shell) {
		execl(shell, shell_arg, NULL);
		errexec(shell);
	}

	/* Execute on command line specified command */
	execvp(argv[0], argv);
	errexec(argv[0]);
}
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	85
1db8bf93 KZ	86	struct arch_domain {
	87	int perval; /* PER_* */
	88	const char *target_arch;
	89	const char *result_arch;
	90	};
	91
	92
cbfa1442	93	static void __attribute__((__noreturn__)) usage(int archwrapper)
8b3a46d2	94	{
77eb13b9	95	fputs(USAGE_HEADER, stdout);
5edb0ea6	96	if (!archwrapper)
05541825	97	printf(_(" %s [<arch>] [options] [<program> [<argument>...]]\n"), program_invocation_short_name);
68243049 BS	98	else
68243049 BS	99	printf(_(" %s [options] [<program> [<argument>...]]\n"), program_invocation_short_name);
451dbcfa BS	100
	101	fputs(USAGE_SEPARATOR, stdout);
	102	fputs(_("Change the reported architecture and set personality flags.\n"), stdout);
	103
77eb13b9	104	fputs(USAGE_OPTIONS, stdout);
77eb13b9	105	fputs(_(" -B, --32bit turns on ADDR_LIMIT_32BIT\n"), stdout);
26b0b857	106	fputs(_(" -F, --fdpic-funcptrs makes function pointers point to descriptors\n"), stdout);
77eb13b9	107	fputs(_(" -I, --short-inode turns on SHORT_INODE\n"), stdout);
26b0b857 BS	108	fputs(_(" -L, --addr-compat-layout changes the way virtual memory is allocated\n"), stdout);
26b0b857 BS	109	fputs(_(" -R, --addr-no-randomize disables randomization of the virtual address space\n"), stdout);
77eb13b9 SK	110	fputs(_(" -S, --whole-seconds turns on WHOLE_SECONDS\n"), stdout);
77eb13b9 SK	111	fputs(_(" -T, --sticky-timeouts turns on STICKY_TIMEOUTS\n"), stdout);
26b0b857 BS	112	fputs(_(" -X, --read-implies-exec turns on READ_IMPLIES_EXEC\n"), stdout);
26b0b857 BS	113	fputs(_(" -Z, --mmap-page-zero turns on MMAP_PAGE_ZERO\n"), stdout);
77eb13b9 SK	114	fputs(_(" -3, --3gb limits the used address space to a maximum of 3 GB\n"), stdout);
	115	fputs(_(" --4gb ignored (for backward compatibility only)\n"), stdout);
	116	fputs(_(" --uname-2.6 turns on UNAME26\n"), stdout);
26b0b857	117	fputs(_(" -v, --verbose say what options are being switched on\n"), stdout);
5edb0ea6 KZ	118
	119	if (!archwrapper)
	120	fputs(_(" --list list settable architectures, and exit\n"), stdout);
26b0b857	121
77eb13b9	122	fputs(USAGE_SEPARATOR, stdout);
f45f3ec3	123	printf(USAGE_HELP_OPTIONS(26));
77eb13b9	124	printf(USAGE_MAN_TAIL("setarch(8)"));
26b0b857	125
77eb13b9	126	exit(EXIT_SUCCESS);
8b3a46d2 KZ	127	}
8b3a46d2 KZ	128
1db8bf93 KZ	129	/*
	130	* Returns inilialized list of all available execution domains.
	131	*/
	132	static struct arch_domain *init_arch_domains(void)
8b3a46d2	133	{
33e87bf1	134	static struct utsname un;
1db8bf93	135	size_t i;
77eb13b9	136
1db8bf93 KZ	137	static struct arch_domain transitions[] =
1db8bf93 KZ	138	{
77eb13b9 SK	139	{UNAME26, "uname26", NULL},
	140	{PER_LINUX32, "linux32", NULL},
	141	{PER_LINUX, "linux64", NULL},
8b3a46d2	142	#if defined(__powerpc__) \|\| defined(__powerpc64__)
77eb13b9 SK	143	# ifdef __BIG_ENDIAN__
	144	{PER_LINUX32, "ppc32", "ppc"},
	145	{PER_LINUX32, "ppc", "ppc"},
	146	{PER_LINUX, "ppc64", "ppc64"},
	147	{PER_LINUX, "ppc64pseries", "ppc64"},
	148	{PER_LINUX, "ppc64iseries", "ppc64"},
	149	# else
e60b6df5 KZ	150	{PER_LINUX32, "ppc32", "ppcle"},
e60b6df5 KZ	151	{PER_LINUX32, "ppc", "ppcle"},
d9ca5dd4 RM	152	{PER_LINUX32, "ppc32le", "ppcle"},
	153	{PER_LINUX32, "ppcle", "ppcle"},
	154	{PER_LINUX, "ppc64le", "ppc64le"},
77eb13b9	155	# endif
8b3a46d2 KZ	156	#endif
8b3a46d2 KZ	157	#if defined(__x86_64__) \|\| defined(__i386__) \|\| defined(__ia64__)
77eb13b9 SK	158	{PER_LINUX32, "i386", "i386"},
	159	{PER_LINUX32, "i486", "i386"},
	160	{PER_LINUX32, "i586", "i386"},
	161	{PER_LINUX32, "i686", "i386"},
	162	{PER_LINUX32, "athlon", "i386"},
8b3a46d2 KZ	163	#endif
8b3a46d2 KZ	164	#if defined(__x86_64__) \|\| defined(__i386__)
77eb13b9	165	{PER_LINUX, "x86_64", "x86_64"},
8b3a46d2 KZ	166	#endif
8b3a46d2 KZ	167	#if defined(__ia64__) \|\| defined(__i386__)
77eb13b9	168	{PER_LINUX, "ia64", "ia64"},
8b3a46d2	169	#endif
782e198d	170	#if defined(__hppa__)
77eb13b9 SK	171	{PER_LINUX32, "parisc32", "parisc"},
	172	{PER_LINUX32, "parisc", "parisc"},
	173	{PER_LINUX, "parisc64", "parisc64"},
782e198d	174	#endif
8b3a46d2	175	#if defined(__s390x__) \|\| defined(__s390__)
77eb13b9 SK	176	{PER_LINUX32, "s390", "s390"},
77eb13b9 SK	177	{PER_LINUX, "s390x", "s390x"},
8b3a46d2 KZ	178	#endif
8b3a46d2 KZ	179	#if defined(__sparc64__) \|\| defined(__sparc__)
77eb13b9 SK	180	{PER_LINUX32, "sparc", "sparc"},
	181	{PER_LINUX32, "sparc32bash", "sparc"},
	182	{PER_LINUX32, "sparc32", "sparc"},
	183	{PER_LINUX, "sparc64", "sparc64"},
8b3a46d2 KZ	184	#endif
8b3a46d2 KZ	185	#if defined(__mips64__) \|\| defined(__mips__)
77eb13b9 SK	186	{PER_LINUX32, "mips32", "mips"},
	187	{PER_LINUX32, "mips", "mips"},
	188	{PER_LINUX, "mips64", "mips64"},
9e19737a BC	189	#endif
9e19737a BC	190	#if defined(__alpha__)
77eb13b9 SK	191	{PER_LINUX, "alpha", "alpha"},
	192	{PER_LINUX, "alphaev5", "alpha"},
	193	{PER_LINUX, "alphaev56", "alpha"},
	194	{PER_LINUX, "alphaev6", "alpha"},
	195	{PER_LINUX, "alphaev67", "alpha"},
146900d4 AS	196	#endif
	197	#if defined(__e2k__)
	198	{PER_LINUX, "e2k", "e2k"},
	199	{PER_LINUX, "e2kv4", "e2k"},
	200	{PER_LINUX, "e2kv5", "e2k"},
	201	{PER_LINUX, "e2kv6", "e2k"},
	202	{PER_LINUX, "e2k4c", "e2k"},
	203	{PER_LINUX, "e2k8c", "e2k"},
	204	{PER_LINUX, "e2k1cp", "e2k"},
	205	{PER_LINUX, "e2k8c2", "e2k"},
	206	{PER_LINUX, "e2k12c", "e2k"},
	207	{PER_LINUX, "e2k16c", "e2k"},
	208	{PER_LINUX, "e2k2c3", "e2k"},
8b3a46d2	209	#endif
77eb13b9 SK	210	/* place holder, will be filled up at runtime */
	211	{-1, NULL, NULL},
	212	{-1, NULL, NULL}
	213	};
	214
	215	/* Add the trivial transition {PER_LINUX, machine, machine} if no
	216	* such target_arch is hardcoded yet. */
	217	uname(&un);
	218	for (i = 0; transitions[i].perval >= 0; i++)
	219	if (!strcmp(un.machine, transitions[i].target_arch))
	220	break;
	221	if (transitions[i].perval < 0) {
	222	unsigned long wrdsz = CHAR_BIT * sizeof(void *);
	223	if (wrdsz == 32 \|\| wrdsz == 64) {
	224	/* fill up the place holder */
	225	transitions[i].perval = wrdsz == 32 ? PER_LINUX32 : PER_LINUX;
	226	transitions[i].target_arch = un.machine;
	227	transitions[i].result_arch = un.machine;
	228	}
ae2c3b5b	229	}
1db8bf93 KZ	230
	231	return transitions;
	232	}
	233
	234	/*
	235	* List all execution domains from transitions
	236	*/
	237	static void list_arch_domains(struct arch_domain *doms)
	238	{
	239	struct arch_domain *d;
	240
	241	for (d = doms; d->target_arch != NULL; d++)
	242	printf("%s\n", d->target_arch);
	243	}
	244
	245	static struct arch_domain get_arch_domain(struct arch_domain doms, const char *pers)
	246	{
	247	struct arch_domain *d;
	248
cf5debba	249	for (d = doms; d && d->perval >= 0; d++) {
1db8bf93	250	if (!strcmp(pers, d->target_arch))
77eb13b9	251	break;
ae706576	252	}
1db8bf93 KZ	253
	254	return !d \|\| d->perval < 0 ? NULL : d;
	255	}
	256
	257	static void verify_arch_domain(struct arch_domain dom, const char wanted)
	258	{
	259	struct utsname un;
	260
	261	if (!dom \|\| !dom->result_arch)
	262	return;
	263
77eb13b9	264	uname(&un);
1db8bf93 KZ	265	if (strcmp(un.machine, dom->result_arch)) {
1db8bf93 KZ	266	if (strcmp(dom->result_arch, "i386")
77eb13b9 SK	267	\|\| (strcmp(un.machine, "i486")
	268	&& strcmp(un.machine, "i586")
	269	&& strcmp(un.machine, "i686")
	270	&& strcmp(un.machine, "athlon")))
1db8bf93	271	errx(EXIT_FAILURE, _("Kernel cannot set architecture to %s"), wanted);
77eb13b9	272	}
8b3a46d2 KZ	273	}
	274
	275	int main(int argc, char *argv[])
	276	{
5edb0ea6	277	const char *arch = NULL;
77eb13b9 SK	278	unsigned long options = 0;
77eb13b9 SK	279	int verbose = 0;
cbfa1442	280	int archwrapper;
77eb13b9	281	int c;
4813a521	282	struct arch_domain doms, target = NULL;
1db8bf93	283	unsigned long pers_value = 0;
3fa06e04	284	char shell = NULL, shell_arg = NULL;
77eb13b9	285
5edb0ea6 KZ	286	/* Options without equivalent short options */
	287	enum {
	288	OPT_4GB = CHAR_MAX + 1,
	289	OPT_UNAME26,
	290	OPT_LIST
	291	};
	292
9e930041	293	/* Options --3gb and --4gb are for compatibility with an old
77eb13b9 SK	294	* Debian setarch implementation. */
	295	static const struct option longopts[] = {
	296	{"help", no_argument, NULL, 'h'},
	297	{"version", no_argument, NULL, 'V'},
	298	{"verbose", no_argument, NULL, 'v'},
	299	{"addr-no-randomize", no_argument, NULL, 'R'},
	300	{"fdpic-funcptrs", no_argument, NULL, 'F'},
	301	{"mmap-page-zero", no_argument, NULL, 'Z'},
	302	{"addr-compat-layout", no_argument, NULL, 'L'},
	303	{"read-implies-exec", no_argument, NULL, 'X'},
	304	{"32bit", no_argument, NULL, 'B'},
	305	{"short-inode", no_argument, NULL, 'I'},
	306	{"whole-seconds", no_argument, NULL, 'S'},
	307	{"sticky-timeouts", no_argument, NULL, 'T'},
	308	{"3gb", no_argument, NULL, '3'},
	309	{"4gb", no_argument, NULL, OPT_4GB},
	310	{"uname-2.6", no_argument, NULL, OPT_UNAME26},
5edb0ea6	311	{"list", no_argument, NULL, OPT_LIST},
77eb13b9 SK	312	{NULL, 0, NULL, 0}
	313	};
	314
	315	setlocale(LC_ALL, "");
	316	bindtextdomain(PACKAGE, LOCALEDIR);
	317	textdomain(PACKAGE);
2c308875	318	close_stdout_atexit();
77eb13b9	319
7a87a774 RM	320	if (argc < 1) {
	321	warnx(_("Not enough arguments"));
	322	errtryhelp(EXIT_FAILURE);
	323	}
5edb0ea6	324	archwrapper = strcmp(program_invocation_short_name, "setarch") != 0;
cbfa1442	325	if (archwrapper) {
5edb0ea6	326	arch = program_invocation_short_name; /* symlinks to setarch */
3fa06e04 KZ	327
	328	/* Don't use ifdef sparc here, we get "Unrecognized architecture"
	329	* error message later if necessary */
cbfa1442	330	if (strcmp(arch, "sparc32bash") == 0) {
3fa06e04 KZ	331	shell = "/bin/bash";
	332	shell_arg = "";
	333	goto set_arch;
cbfa1442	334	}
cbfa1442	335	} else {
00b5ef70	336	if (1 < argc && *argv[1] != '-') {
5edb0ea6 KZ	337	arch = argv[1];
	338	argv[1] = argv[0]; /* for getopt_long() to get the program name */
	339	argv++;
	340	argc--;
77eb13b9 SK	341	}
77eb13b9 SK	342	}
5edb0ea6	343
77eb13b9 SK	344	while ((c = getopt_long(argc, argv, "+hVv3BFILRSTXZ", longopts, NULL)) != -1) {
77eb13b9 SK	345	switch (c) {
77eb13b9 SK	346	case 'v':
	347	verbose = 1;
	348	break;
	349	case 'R':
	350	turn_on(ADDR_NO_RANDOMIZE, options);
	351	break;
	352	case 'F':
	353	turn_on(FDPIC_FUNCPTRS, options);
	354	break;
	355	case 'Z':
	356	turn_on(MMAP_PAGE_ZERO, options);
	357	break;
	358	case 'L':
	359	turn_on(ADDR_COMPAT_LAYOUT, options);
	360	break;
	361	case 'X':
	362	turn_on(READ_IMPLIES_EXEC, options);
	363	break;
	364	case 'B':
	365	turn_on(ADDR_LIMIT_32BIT, options);
	366	break;
	367	case 'I':
	368	turn_on(SHORT_INODE, options);
	369	break;
	370	case 'S':
	371	turn_on(WHOLE_SECONDS, options);
	372	break;
	373	case 'T':
	374	turn_on(STICKY_TIMEOUTS, options);
	375	break;
	376	case '3':
	377	turn_on(ADDR_LIMIT_3GB, options);
	378	break;
	379	case OPT_4GB: /* just ignore this one */
	380	break;
	381	case OPT_UNAME26:
	382	turn_on(UNAME26, options);
	383	break;
5edb0ea6 KZ	384	case OPT_LIST:
5edb0ea6 KZ	385	if (!archwrapper) {
1db8bf93	386	list_arch_domains(init_arch_domains());
b2b5b502	387	return EXIT_SUCCESS;
5edb0ea6 KZ	388	} else
5edb0ea6 KZ	389	warnx(_("unrecognized option '--list'"));
9a8fada1	390	/* fallthrough */
2c308875	391
77eb13b9	392	default:
677ec86c	393	errtryhelp(EXIT_FAILURE);
2c308875 KZ	394	case 'h':
	395	usage(archwrapper);
	396	case 'V':
	397	print_version(EXIT_SUCCESS);
77eb13b9 SK	398	}
77eb13b9 SK	399	}
8b3a46d2	400
05541825 KZ	401	if (!arch && !options)
05541825 KZ	402	errx(EXIT_FAILURE, _("no architecture argument or personality flags specified"));
5edb0ea6	403
77eb13b9 SK	404	argc -= optind;
77eb13b9 SK	405	argv += optind;
8df90dec	406
3fa06e04	407	set_arch:
05541825 KZ	408	/* get execution domain (architecture) */
	409	if (arch) {
	410	doms = init_arch_domains();
	411	target = get_arch_domain(doms, arch);
1db8bf93	412
05541825 KZ	413	if (!target)
	414	errx(EXIT_FAILURE, _("%s: Unrecognized architecture"), arch);
	415	pers_value = target->perval;
	416	}
	417
	418	/* add personality flags */
	419	pers_value \|= options;
1db8bf93	420
05541825	421	/* call kernel */
1db8bf93 KZ	422	if (personality(pers_value) < 0) {
	423	/*
	424	* Depending on architecture and kernel version, personality
	425	* syscall is either capable or incapable of returning an error.
	426	* If the return value is not an error, then it's the previous
	427	* personality value, which can be an arbitrary value
	428	* undistinguishable from an error value.
	429	* To make things clear, a second call is needed.
	430	*/
	431	if (personality(pers_value) < 0)
	432	err(EXIT_FAILURE, _("failed to set personality to %s"), arch);
	433	}
	434
05541825 KZ	435	/* make sure architecture is set as expected */
	436	if (arch)
	437	verify_arch_domain(target, arch);
8b3a46d2	438
3fa06e04 KZ	439	if (!argc) {
	440	shell = "/bin/sh";
	441	shell_arg = "-sh";
	442	}
9508e297	443	if (verbose) {
3fa06e04	444	printf(_("Execute command `%s'.\n"), shell ? shell : argv[0]);
9508e297 RM	445	/* flush all output streams before exec */
	446	fflush(NULL);
	447	}
34c265f0	448
3fa06e04 KZ	449	/* Execute shell */
	450	if (shell) {
	451	execl(shell, shell_arg, NULL);
	452	errexec(shell);
77eb13b9	453	}
8b3a46d2	454
3fa06e04	455	/* Execute on command line specified command */
77eb13b9	456	execvp(argv[0], argv);
fd777151	457	errexec(argv[0]);
8b3a46d2	458	}