[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"
#include "sysfs.h"
#include "strutils.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

/* fallback for old glibc-headers 2.17 */
#ifndef PER_LINUX_FDPIC
# define PER_LINUX_FDPIC	(PER_LINUX | FDPIC_FUNCPTRS)
#endif

/* fallback for old uclibc-headers < 1.0.39 */
#ifndef PER_LINUX32_3GB
# define PER_LINUX32_3GB	(PER_LINUX32 | ADDR_LIMIT_3GB)
#endif

#define ALL_PERSONALITIES \
    X(PER_LINUX) \
    X(PER_LINUX_32BIT) \
    X(PER_LINUX_FDPIC) \
    X(PER_SVR4) \
    X(PER_SVR3) \
    X(PER_SCOSVR3) \
    X(PER_OSR5) \
    X(PER_WYSEV386) \
    X(PER_ISCR4) \
    X(PER_BSD) \
    X(PER_SUNOS) \
    X(PER_XENIX) \
    X(PER_LINUX32) \
    X(PER_LINUX32_3GB) \
    X(PER_IRIX32) \
    X(PER_IRIXN32) \
    X(PER_IRIX64) \
    X(PER_RISCOS) \
    X(PER_SOLARIS) \
    X(PER_UW7) \
    X(PER_OSF4) \
    X(PER_HPUX) \


#define ALL_OPTIONS \
    X(UNAME26) \
    X(ADDR_NO_RANDOMIZE) \
    X(FDPIC_FUNCPTRS) \
    X(MMAP_PAGE_ZERO) \
    X(ADDR_COMPAT_LAYOUT) \
    X(READ_IMPLIES_EXEC) \
    X(ADDR_LIMIT_32BIT) \
    X(SHORT_INODE) \
    X(WHOLE_SECONDS) \
    X(STICKY_TIMEOUTS) \
    X(ADDR_LIMIT_3GB) \


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)
		fprintf(stdout, _(" %s [<arch>] [options] [<program> [<argument>...]]\n"), program_invocation_short_name);
	else
		fprintf(stdout, _(" %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(_("     --show[=personality] show current or specific personality and exit\n"), stdout);
	}

	fputs(USAGE_SEPARATOR, stdout);
	fprintf(stdout, USAGE_HELP_OPTIONS(26));
	fprintf(stdout, 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(__loongarch__)
		{PER_LINUX,	"loongarch",	"loongarch64"},
		{PER_LINUX,	"loongarch64",	"loongarch64"},
#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
#if defined(__arm__) || defined(__aarch64__)
# ifdef __BIG_ENDIAN__
		{PER_LINUX32,	"armv7b",	"arm"},
		{PER_LINUX32,	"armv8b",	"arm"},
# else
		{PER_LINUX32,	"armv7l",	"arm"},
		{PER_LINUX32,	"armv8l",	"arm"},
# endif
		{PER_LINUX32,	"armh",		"arm"},
		{PER_LINUX32,	"arm",		"arm"},
		{PER_LINUX,	"arm64",	"aarch64"},
		{PER_LINUX,	"aarch64",	"aarch64"},
#endif
#if defined(__riscv)
		{PER_LINUX32,	"riscv32",	"riscv32"},
		{PER_LINUX32,	"rv32",	"riscv32"},
		{PER_LINUX,	"riscv64",	"riscv64"},
		{PER_LINUX,	"rv64",	"riscv64"},
#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) {
		int wrdsz = sysfs_get_address_bits(NULL);
		if (wrdsz < 0)
			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 *doms, struct arch_domain *target, const char *wanted)
{
	struct utsname un;

	if (!doms || !target || !target->result_arch)
		return;

	uname(&un);

	if (!strcmp(un.machine, target->result_arch))
		return;

	if (!strcmp(target->result_arch, "i386") ||
	    !strcmp(target->result_arch, "arm")) {
		struct arch_domain *dom;
		for (dom = doms; dom->target_arch != NULL; dom++) {
			if (!dom->result_arch || strcmp(dom->result_arch, target->result_arch))
				continue;
			if (!strcmp(dom->target_arch, un.machine))
				return;
		}
	}

	errx(EXIT_FAILURE, _("Kernel cannot set architecture to %s"), wanted);
}

static const struct { int value; const char * const name; } all_personalities[] = {
#define X(opt) { .value = opt, .name = #opt },
	ALL_PERSONALITIES
#undef X
};

static const struct { int value; const char * const name; } all_options[] = {
#define X(opt) { .value = opt, .name = #opt },
	ALL_OPTIONS
#undef X
};

static void show_personality(int pers)
{
	int options;
	size_t i;

	/* Test for exact matches including options */
	for (i = 0; i < ARRAY_SIZE(all_personalities); i++) {
		if (pers == all_personalities[i].value) {
			printf("%s\n", all_personalities[i].name);
			return;
		}
	}

	options = pers & ~PER_MASK;
	pers &= PER_MASK;

	/* Second test for type-only matches */
	for (i = 0; i < ARRAY_SIZE(all_personalities); i++) {
		if (pers == all_personalities[i].value) {
			printf("%s", all_personalities[i].name);
			break;
		}
	}

	if (i == ARRAY_SIZE(all_personalities))
		printf("0x%02x", pers);

	if (options) {
		printf(" (");

		for (i = 0; i < ARRAY_SIZE(all_options); i++) {
			if (options & all_options[i].value) {
				printf("%s", all_options[i].name);

				options &= ~all_options[i].value;
				if (options)
					printf(" ");
			}
		}
		if (options)
			printf("0x%08x", options);
		printf(")");
	}
	printf("\n");
}

static void show_current_personality(void)
{
	int pers = personality(0xffffffff);
	if (pers == -1)
		err(EXIT_FAILURE, _("Can not get current kernel personality"));

	show_personality(pers);
}

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 = NULL, *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,
		OPT_SHOW,
	};

	/* 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},
		{"show",		optional_argument,	NULL,	OPT_SHOW},
		{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'"));
			goto error_getopts;
		case OPT_SHOW:
			if (!archwrapper) {
				if (!optarg || strcmp(optarg, "current") == 0)
					show_current_personality();
				else
					show_personality(str2num_or_err(
						optarg, 16,
						_("could not parse personality"),
						0, INT_MAX));
				return EXIT_SUCCESS;
			} else
				warnx(_("unrecognized option '--show'"));
			goto error_getopts;

error_getopts:
		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(doms, 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, (char *)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"
035fc2d9	38	#include "sysfs.h"
03a254f0	39	#include "strutils.h"
8b3a46d2	40
9ed11cc2 SK	41	#ifndef HAVE_PERSONALITY
	42	# include <syscall.h>
	43	# define personality(pers) ((long)syscall(SYS_personality, pers))
	44	#endif
8b3a46d2	45
8df90dec KZ	46	#define turn_on(_flag, _opts) \
	47	do { \
	48	(_opts) \|= _flag; \
	49	if (verbose) \
	50	printf(_("Switching on %s.\n"), #_flag); \
	51	} while(0)
	52
f29a3d18	53	#ifndef UNAME26
70eebc40 BH	54	# define UNAME26 0x0020000
70eebc40 BH	55	#endif
f29a3d18	56	#ifndef ADDR_NO_RANDOMIZE
2d281745 KZ	57	# define ADDR_NO_RANDOMIZE 0x0040000
2d281745 KZ	58	#endif
f29a3d18	59	#ifndef FDPIC_FUNCPTRS
2d281745 KZ	60	# define FDPIC_FUNCPTRS 0x0080000
2d281745 KZ	61	#endif
f29a3d18	62	#ifndef MMAP_PAGE_ZERO
2d281745 KZ	63	# define MMAP_PAGE_ZERO 0x0100000
2d281745 KZ	64	#endif
f29a3d18	65	#ifndef ADDR_COMPAT_LAYOUT
2d281745 KZ	66	# define ADDR_COMPAT_LAYOUT 0x0200000
2d281745 KZ	67	#endif
f29a3d18	68	#ifndef READ_IMPLIES_EXEC
2d281745 KZ	69	# define READ_IMPLIES_EXEC 0x0400000
2d281745 KZ	70	#endif
f29a3d18	71	#ifndef ADDR_LIMIT_32BIT
2d281745 KZ	72	# define ADDR_LIMIT_32BIT 0x0800000
2d281745 KZ	73	#endif
f29a3d18	74	#ifndef SHORT_INODE
2d281745 KZ	75	# define SHORT_INODE 0x1000000
2d281745 KZ	76	#endif
f29a3d18	77	#ifndef WHOLE_SECONDS
2d281745 KZ	78	# define WHOLE_SECONDS 0x2000000
2d281745 KZ	79	#endif
f29a3d18	80	#ifndef STICKY_TIMEOUTS
2d281745 KZ	81	# define STICKY_TIMEOUTS 0x4000000
2d281745 KZ	82	#endif
f29a3d18	83	#ifndef ADDR_LIMIT_3GB
2d281745 KZ	84	# define ADDR_LIMIT_3GB 0x8000000
	85	#endif
	86
2756f004 KZ	87	/* fallback for old glibc-headers 2.17 */
	88	#ifndef PER_LINUX_FDPIC
	89	# define PER_LINUX_FDPIC (PER_LINUX \| FDPIC_FUNCPTRS)
	90	#endif
	91
beef18da FF	92	/* fallback for old uclibc-headers < 1.0.39 */
	93	#ifndef PER_LINUX32_3GB
	94	# define PER_LINUX32_3GB (PER_LINUX32 \| ADDR_LIMIT_3GB)
	95	#endif
	96
03a254f0 TW	97	#define ALL_PERSONALITIES \
	98	X(PER_LINUX) \
	99	X(PER_LINUX_32BIT) \
	100	X(PER_LINUX_FDPIC) \
	101	X(PER_SVR4) \
	102	X(PER_SVR3) \
	103	X(PER_SCOSVR3) \
	104	X(PER_OSR5) \
	105	X(PER_WYSEV386) \
	106	X(PER_ISCR4) \
	107	X(PER_BSD) \
	108	X(PER_SUNOS) \
	109	X(PER_XENIX) \
	110	X(PER_LINUX32) \
	111	X(PER_LINUX32_3GB) \
	112	X(PER_IRIX32) \
	113	X(PER_IRIXN32) \
	114	X(PER_IRIX64) \
	115	X(PER_RISCOS) \
	116	X(PER_SOLARIS) \
	117	X(PER_UW7) \
	118	X(PER_OSF4) \
	119	X(PER_HPUX) \
	120
	121
	122	#define ALL_OPTIONS \
	123	X(UNAME26) \
	124	X(ADDR_NO_RANDOMIZE) \
	125	X(FDPIC_FUNCPTRS) \
	126	X(MMAP_PAGE_ZERO) \
	127	X(ADDR_COMPAT_LAYOUT) \
	128	X(READ_IMPLIES_EXEC) \
	129	X(ADDR_LIMIT_32BIT) \
	130	X(SHORT_INODE) \
	131	X(WHOLE_SECONDS) \
	132	X(STICKY_TIMEOUTS) \
	133	X(ADDR_LIMIT_3GB) \
	134
5edb0ea6	135
1db8bf93 KZ	136	struct arch_domain {
	137	int perval; /* PER_* */
	138	const char *target_arch;
	139	const char *result_arch;
	140	};
	141
	142
cbfa1442	143	static void __attribute__((__noreturn__)) usage(int archwrapper)
8b3a46d2	144	{
77eb13b9	145	fputs(USAGE_HEADER, stdout);
5edb0ea6	146	if (!archwrapper)
bad4c729	147	fprintf(stdout, _(" %s [<arch>] [options] [<program> [<argument>...]]\n"), program_invocation_short_name);
68243049	148	else
bad4c729	149	fprintf(stdout, _(" %s [options] [<program> [<argument>...]]\n"), program_invocation_short_name);
451dbcfa BS	150
	151	fputs(USAGE_SEPARATOR, stdout);
	152	fputs(_("Change the reported architecture and set personality flags.\n"), stdout);
	153
77eb13b9	154	fputs(USAGE_OPTIONS, stdout);
77eb13b9	155	fputs(_(" -B, --32bit turns on ADDR_LIMIT_32BIT\n"), stdout);
26b0b857	156	fputs(_(" -F, --fdpic-funcptrs makes function pointers point to descriptors\n"), stdout);
77eb13b9	157	fputs(_(" -I, --short-inode turns on SHORT_INODE\n"), stdout);
26b0b857 BS	158	fputs(_(" -L, --addr-compat-layout changes the way virtual memory is allocated\n"), stdout);
26b0b857 BS	159	fputs(_(" -R, --addr-no-randomize disables randomization of the virtual address space\n"), stdout);
77eb13b9 SK	160	fputs(_(" -S, --whole-seconds turns on WHOLE_SECONDS\n"), stdout);
77eb13b9 SK	161	fputs(_(" -T, --sticky-timeouts turns on STICKY_TIMEOUTS\n"), stdout);
26b0b857 BS	162	fputs(_(" -X, --read-implies-exec turns on READ_IMPLIES_EXEC\n"), stdout);
26b0b857 BS	163	fputs(_(" -Z, --mmap-page-zero turns on MMAP_PAGE_ZERO\n"), stdout);
77eb13b9 SK	164	fputs(_(" -3, --3gb limits the used address space to a maximum of 3 GB\n"), stdout);
	165	fputs(_(" --4gb ignored (for backward compatibility only)\n"), stdout);
	166	fputs(_(" --uname-2.6 turns on UNAME26\n"), stdout);
26b0b857	167	fputs(_(" -v, --verbose say what options are being switched on\n"), stdout);
5edb0ea6	168
03a254f0	169	if (!archwrapper) {
5edb0ea6	170	fputs(_(" --list list settable architectures, and exit\n"), stdout);
03a254f0 TW	171	fputs(_(" --show[=personality] show current or specific personality and exit\n"), stdout);
03a254f0 TW	172	}
26b0b857	173
77eb13b9	174	fputs(USAGE_SEPARATOR, stdout);
bad4c729 MY	175	fprintf(stdout, USAGE_HELP_OPTIONS(26));
bad4c729 MY	176	fprintf(stdout, USAGE_MAN_TAIL("setarch(8)"));
26b0b857	177
77eb13b9	178	exit(EXIT_SUCCESS);
8b3a46d2 KZ	179	}
8b3a46d2 KZ	180
1db8bf93 KZ	181	/*
	182	* Returns inilialized list of all available execution domains.
	183	*/
	184	static struct arch_domain *init_arch_domains(void)
8b3a46d2	185	{
33e87bf1	186	static struct utsname un;
1db8bf93	187	size_t i;
77eb13b9	188
1db8bf93 KZ	189	static struct arch_domain transitions[] =
1db8bf93 KZ	190	{
77eb13b9 SK	191	{UNAME26, "uname26", NULL},
	192	{PER_LINUX32, "linux32", NULL},
	193	{PER_LINUX, "linux64", NULL},
8b3a46d2	194	#if defined(__powerpc__) \|\| defined(__powerpc64__)
77eb13b9 SK	195	# ifdef __BIG_ENDIAN__
	196	{PER_LINUX32, "ppc32", "ppc"},
	197	{PER_LINUX32, "ppc", "ppc"},
	198	{PER_LINUX, "ppc64", "ppc64"},
	199	{PER_LINUX, "ppc64pseries", "ppc64"},
	200	{PER_LINUX, "ppc64iseries", "ppc64"},
	201	# else
e60b6df5 KZ	202	{PER_LINUX32, "ppc32", "ppcle"},
e60b6df5 KZ	203	{PER_LINUX32, "ppc", "ppcle"},
d9ca5dd4 RM	204	{PER_LINUX32, "ppc32le", "ppcle"},
	205	{PER_LINUX32, "ppcle", "ppcle"},
	206	{PER_LINUX, "ppc64le", "ppc64le"},
77eb13b9	207	# endif
8b3a46d2 KZ	208	#endif
8b3a46d2 KZ	209	#if defined(__x86_64__) \|\| defined(__i386__) \|\| defined(__ia64__)
77eb13b9 SK	210	{PER_LINUX32, "i386", "i386"},
	211	{PER_LINUX32, "i486", "i386"},
	212	{PER_LINUX32, "i586", "i386"},
	213	{PER_LINUX32, "i686", "i386"},
	214	{PER_LINUX32, "athlon", "i386"},
8b3a46d2 KZ	215	#endif
8b3a46d2 KZ	216	#if defined(__x86_64__) \|\| defined(__i386__)
77eb13b9	217	{PER_LINUX, "x86_64", "x86_64"},
8b3a46d2 KZ	218	#endif
8b3a46d2 KZ	219	#if defined(__ia64__) \|\| defined(__i386__)
77eb13b9	220	{PER_LINUX, "ia64", "ia64"},
8b3a46d2	221	#endif
782e198d	222	#if defined(__hppa__)
77eb13b9 SK	223	{PER_LINUX32, "parisc32", "parisc"},
	224	{PER_LINUX32, "parisc", "parisc"},
	225	{PER_LINUX, "parisc64", "parisc64"},
782e198d	226	#endif
8b3a46d2	227	#if defined(__s390x__) \|\| defined(__s390__)
77eb13b9 SK	228	{PER_LINUX32, "s390", "s390"},
77eb13b9 SK	229	{PER_LINUX, "s390x", "s390x"},
8b3a46d2 KZ	230	#endif
8b3a46d2 KZ	231	#if defined(__sparc64__) \|\| defined(__sparc__)
77eb13b9 SK	232	{PER_LINUX32, "sparc", "sparc"},
	233	{PER_LINUX32, "sparc32bash", "sparc"},
	234	{PER_LINUX32, "sparc32", "sparc"},
	235	{PER_LINUX, "sparc64", "sparc64"},
8b3a46d2 KZ	236	#endif
8b3a46d2 KZ	237	#if defined(__mips64__) \|\| defined(__mips__)
77eb13b9 SK	238	{PER_LINUX32, "mips32", "mips"},
	239	{PER_LINUX32, "mips", "mips"},
	240	{PER_LINUX, "mips64", "mips64"},
9e19737a BC	241	#endif
9e19737a BC	242	#if defined(__alpha__)
77eb13b9 SK	243	{PER_LINUX, "alpha", "alpha"},
	244	{PER_LINUX, "alphaev5", "alpha"},
	245	{PER_LINUX, "alphaev56", "alpha"},
	246	{PER_LINUX, "alphaev6", "alpha"},
	247	{PER_LINUX, "alphaev67", "alpha"},
146900d4	248	#endif
f791eea8 EL	249	#if defined(__loongarch__)
	250	{PER_LINUX, "loongarch", "loongarch64"},
	251	{PER_LINUX, "loongarch64", "loongarch64"},
	252	#endif
146900d4 AS	253	#if defined(__e2k__)
	254	{PER_LINUX, "e2k", "e2k"},
	255	{PER_LINUX, "e2kv4", "e2k"},
	256	{PER_LINUX, "e2kv5", "e2k"},
	257	{PER_LINUX, "e2kv6", "e2k"},
	258	{PER_LINUX, "e2k4c", "e2k"},
	259	{PER_LINUX, "e2k8c", "e2k"},
	260	{PER_LINUX, "e2k1cp", "e2k"},
	261	{PER_LINUX, "e2k8c2", "e2k"},
	262	{PER_LINUX, "e2k12c", "e2k"},
	263	{PER_LINUX, "e2k16c", "e2k"},
	264	{PER_LINUX, "e2k2c3", "e2k"},
9fd01b10 AG	265	#endif
	266	#if defined(__arm__) \|\| defined(__aarch64__)
	267	# ifdef __BIG_ENDIAN__
	268	{PER_LINUX32, "armv7b", "arm"},
	269	{PER_LINUX32, "armv8b", "arm"},
	270	# else
	271	{PER_LINUX32, "armv7l", "arm"},
	272	{PER_LINUX32, "armv8l", "arm"},
	273	# endif
	274	{PER_LINUX32, "armh", "arm"},
	275	{PER_LINUX32, "arm", "arm"},
	276	{PER_LINUX, "arm64", "aarch64"},
	277	{PER_LINUX, "aarch64", "aarch64"},
a3c05171 MB	278	#endif
	279	#if defined(__riscv)
	280	{PER_LINUX32, "riscv32", "riscv32"},
	281	{PER_LINUX32, "rv32", "riscv32"},
	282	{PER_LINUX, "riscv64", "riscv64"},
	283	{PER_LINUX, "rv64", "riscv64"},
8b3a46d2	284	#endif
77eb13b9 SK	285	/* place holder, will be filled up at runtime */
	286	{-1, NULL, NULL},
	287	{-1, NULL, NULL}
	288	};
	289
	290	/* Add the trivial transition {PER_LINUX, machine, machine} if no
	291	* such target_arch is hardcoded yet. */
	292	uname(&un);
	293	for (i = 0; transitions[i].perval >= 0; i++)
	294	if (!strcmp(un.machine, transitions[i].target_arch))
	295	break;
	296	if (transitions[i].perval < 0) {
035fc2d9 TW	297	int wrdsz = sysfs_get_address_bits(NULL);
	298	if (wrdsz < 0)
	299	wrdsz = CHAR_BIT * sizeof(void *);
77eb13b9 SK	300	if (wrdsz == 32 \|\| wrdsz == 64) {
	301	/* fill up the place holder */
	302	transitions[i].perval = wrdsz == 32 ? PER_LINUX32 : PER_LINUX;
	303	transitions[i].target_arch = un.machine;
	304	transitions[i].result_arch = un.machine;
	305	}
ae2c3b5b	306	}
1db8bf93 KZ	307
	308	return transitions;
	309	}
	310
	311	/*
	312	* List all execution domains from transitions
	313	*/
	314	static void list_arch_domains(struct arch_domain *doms)
	315	{
	316	struct arch_domain *d;
	317
	318	for (d = doms; d->target_arch != NULL; d++)
	319	printf("%s\n", d->target_arch);
	320	}
	321
	322	static struct arch_domain get_arch_domain(struct arch_domain doms, const char *pers)
	323	{
	324	struct arch_domain *d;
	325
cf5debba	326	for (d = doms; d && d->perval >= 0; d++) {
1db8bf93	327	if (!strcmp(pers, d->target_arch))
77eb13b9	328	break;
ae706576	329	}
1db8bf93 KZ	330
	331	return !d \|\| d->perval < 0 ? NULL : d;
	332	}
	333
7f48cfb0	334	static void verify_arch_domain(struct arch_domain doms, struct arch_domain target, const char *wanted)
1db8bf93 KZ	335	{
	336	struct utsname un;
	337
7f48cfb0	338	if (!doms \|\| !target \|\| !target->result_arch)
1db8bf93 KZ	339	return;
1db8bf93 KZ	340
77eb13b9	341	uname(&un);
7f48cfb0 AG	342
	343	if (!strcmp(un.machine, target->result_arch))
	344	return;
	345
9fd01b10 AG	346	if (!strcmp(target->result_arch, "i386") \|\|
9fd01b10 AG	347	!strcmp(target->result_arch, "arm")) {
7f48cfb0 AG	348	struct arch_domain *dom;
	349	for (dom = doms; dom->target_arch != NULL; dom++) {
	350	if (!dom->result_arch \|\| strcmp(dom->result_arch, target->result_arch))
	351	continue;
	352	if (!strcmp(dom->target_arch, un.machine))
	353	return;
	354	}
77eb13b9	355	}
7f48cfb0 AG	356
7f48cfb0 AG	357	errx(EXIT_FAILURE, _("Kernel cannot set architecture to %s"), wanted);
8b3a46d2 KZ	358	}
8b3a46d2 KZ	359
03a254f0 TW	360	static const struct { int value; const char * const name; } all_personalities[] = {
	361	#define X(opt) { .value = opt, .name = #opt },
	362	ALL_PERSONALITIES
	363	#undef X
	364	};
	365
	366	static const struct { int value; const char * const name; } all_options[] = {
	367	#define X(opt) { .value = opt, .name = #opt },
	368	ALL_OPTIONS
	369	#undef X
	370	};
	371
	372	static void show_personality(int pers)
	373	{
	374	int options;
	375	size_t i;
	376
	377	/* Test for exact matches including options */
	378	for (i = 0; i < ARRAY_SIZE(all_personalities); i++) {
	379	if (pers == all_personalities[i].value) {
	380	printf("%s\n", all_personalities[i].name);
	381	return;
	382	}
	383	}
	384
	385	options = pers & ~PER_MASK;
	386	pers &= PER_MASK;
	387
	388	/* Second test for type-only matches */
	389	for (i = 0; i < ARRAY_SIZE(all_personalities); i++) {
	390	if (pers == all_personalities[i].value) {
	391	printf("%s", all_personalities[i].name);
	392	break;
	393	}
	394	}
	395
	396	if (i == ARRAY_SIZE(all_personalities))
	397	printf("0x%02x", pers);
	398
	399	if (options) {
	400	printf(" (");
	401
	402	for (i = 0; i < ARRAY_SIZE(all_options); i++) {
	403	if (options & all_options[i].value) {
	404	printf("%s", all_options[i].name);
	405
	406	options &= ~all_options[i].value;
	407	if (options)
	408	printf(" ");
	409	}
	410	}
	411	if (options)
	412	printf("0x%08x", options);
	413	printf(")");
	414	}
	415	printf("\n");
	416	}
	417
	418	static void show_current_personality(void)
	419	{
	420	int pers = personality(0xffffffff);
	421	if (pers == -1)
	422	err(EXIT_FAILURE, _("Can not get current kernel personality"));
	423
424	show_personality(pers);
425	}
426
8b3a46d2 KZ	427	int main(int argc, char *argv[])
8b3a46d2 KZ	428	{
5edb0ea6	429	const char *arch = NULL;
77eb13b9 SK	430	unsigned long options = 0;
77eb13b9 SK	431	int verbose = 0;
cbfa1442	432	int archwrapper;
77eb13b9	433	int c;
7f48cfb0	434	struct arch_domain doms = NULL, target = NULL;
1db8bf93	435	unsigned long pers_value = 0;
3fa06e04	436	char shell = NULL, shell_arg = NULL;
77eb13b9	437
5edb0ea6 KZ	438	/* Options without equivalent short options */
	439	enum {
	440	OPT_4GB = CHAR_MAX + 1,
	441	OPT_UNAME26,
03a254f0 TW	442	OPT_LIST,
03a254f0 TW	443	OPT_SHOW,
5edb0ea6 KZ	444	};
5edb0ea6 KZ	445
9e930041	446	/* Options --3gb and --4gb are for compatibility with an old
77eb13b9 SK	447	* Debian setarch implementation. */
77eb13b9 SK	448	static const struct option longopts[] = {
03a254f0 TW	449	{"help", no_argument, NULL, 'h'},
	450	{"version", no_argument, NULL, 'V'},
	451	{"verbose", no_argument, NULL, 'v'},
	452	{"addr-no-randomize", no_argument, NULL, 'R'},
	453	{"fdpic-funcptrs", no_argument, NULL, 'F'},
	454	{"mmap-page-zero", no_argument, NULL, 'Z'},
	455	{"addr-compat-layout", no_argument, NULL, 'L'},
	456	{"read-implies-exec", no_argument, NULL, 'X'},
	457	{"32bit", no_argument, NULL, 'B'},
	458	{"short-inode", no_argument, NULL, 'I'},
	459	{"whole-seconds", no_argument, NULL, 'S'},
	460	{"sticky-timeouts", no_argument, NULL, 'T'},
	461	{"3gb", no_argument, NULL, '3'},
	462	{"4gb", no_argument, NULL, OPT_4GB},
	463	{"uname-2.6", no_argument, NULL, OPT_UNAME26},
	464	{"list", no_argument, NULL, OPT_LIST},
	465	{"show", optional_argument, NULL, OPT_SHOW},
	466	{NULL, 0, NULL, 0}
77eb13b9 SK	467	};
	468
	469	setlocale(LC_ALL, "");
	470	bindtextdomain(PACKAGE, LOCALEDIR);
	471	textdomain(PACKAGE);
2c308875	472	close_stdout_atexit();
77eb13b9	473
7a87a774 RM	474	if (argc < 1) {
	475	warnx(_("Not enough arguments"));
	476	errtryhelp(EXIT_FAILURE);
	477	}
5edb0ea6	478	archwrapper = strcmp(program_invocation_short_name, "setarch") != 0;
cbfa1442	479	if (archwrapper) {
5edb0ea6	480	arch = program_invocation_short_name; /* symlinks to setarch */
3fa06e04 KZ	481
	482	/* Don't use ifdef sparc here, we get "Unrecognized architecture"
	483	* error message later if necessary */
cbfa1442	484	if (strcmp(arch, "sparc32bash") == 0) {
3fa06e04 KZ	485	shell = "/bin/bash";
	486	shell_arg = "";
	487	goto set_arch;
cbfa1442	488	}
cbfa1442	489	} else {
00b5ef70	490	if (1 < argc && *argv[1] != '-') {
5edb0ea6 KZ	491	arch = argv[1];
	492	argv[1] = argv[0]; /* for getopt_long() to get the program name */
	493	argv++;
	494	argc--;
77eb13b9 SK	495	}
77eb13b9 SK	496	}
5edb0ea6	497
77eb13b9 SK	498	while ((c = getopt_long(argc, argv, "+hVv3BFILRSTXZ", longopts, NULL)) != -1) {
77eb13b9 SK	499	switch (c) {
77eb13b9 SK	500	case 'v':
	501	verbose = 1;
	502	break;
	503	case 'R':
	504	turn_on(ADDR_NO_RANDOMIZE, options);
	505	break;
	506	case 'F':
	507	turn_on(FDPIC_FUNCPTRS, options);
	508	break;
	509	case 'Z':
	510	turn_on(MMAP_PAGE_ZERO, options);
	511	break;
	512	case 'L':
	513	turn_on(ADDR_COMPAT_LAYOUT, options);
	514	break;
	515	case 'X':
	516	turn_on(READ_IMPLIES_EXEC, options);
	517	break;
	518	case 'B':
	519	turn_on(ADDR_LIMIT_32BIT, options);
	520	break;
	521	case 'I':
	522	turn_on(SHORT_INODE, options);
	523	break;
	524	case 'S':
	525	turn_on(WHOLE_SECONDS, options);
	526	break;
	527	case 'T':
	528	turn_on(STICKY_TIMEOUTS, options);
	529	break;
	530	case '3':
	531	turn_on(ADDR_LIMIT_3GB, options);
	532	break;
	533	case OPT_4GB: /* just ignore this one */
	534	break;
	535	case OPT_UNAME26:
	536	turn_on(UNAME26, options);
	537	break;
5edb0ea6 KZ	538	case OPT_LIST:
5edb0ea6 KZ	539	if (!archwrapper) {
1db8bf93	540	list_arch_domains(init_arch_domains());
b2b5b502	541	return EXIT_SUCCESS;
5edb0ea6 KZ	542	} else
5edb0ea6 KZ	543	warnx(_("unrecognized option '--list'"));
03a254f0 TW	544	goto error_getopts;
	545	case OPT_SHOW:
	546	if (!archwrapper) {
	547	if (!optarg \|\| strcmp(optarg, "current") == 0)
	548	show_current_personality();
	549	else
	550	show_personality(str2num_or_err(
	551	optarg, 16,
	552	_("could not parse personality"),
	553	0, INT_MAX));
	554	return EXIT_SUCCESS;
	555	} else
	556	warnx(_("unrecognized option '--show'"));
	557	goto error_getopts;
2c308875	558
03a254f0	559	error_getopts:
77eb13b9	560	default:
677ec86c	561	errtryhelp(EXIT_FAILURE);
2c308875 KZ	562	case 'h':
	563	usage(archwrapper);
	564	case 'V':
	565	print_version(EXIT_SUCCESS);
77eb13b9 SK	566	}
77eb13b9 SK	567	}
8b3a46d2	568
05541825 KZ	569	if (!arch && !options)
05541825 KZ	570	errx(EXIT_FAILURE, _("no architecture argument or personality flags specified"));
5edb0ea6	571
77eb13b9 SK	572	argc -= optind;
77eb13b9 SK	573	argv += optind;
8df90dec	574
3fa06e04	575	set_arch:
05541825 KZ	576	/* get execution domain (architecture) */
	577	if (arch) {
	578	doms = init_arch_domains();
	579	target = get_arch_domain(doms, arch);
1db8bf93	580
05541825 KZ	581	if (!target)
	582	errx(EXIT_FAILURE, _("%s: Unrecognized architecture"), arch);
	583	pers_value = target->perval;
	584	}
	585
	586	/* add personality flags */
	587	pers_value \|= options;
1db8bf93	588
05541825	589	/* call kernel */
1db8bf93 KZ	590	if (personality(pers_value) < 0) {
	591	/*
	592	* Depending on architecture and kernel version, personality
	593	* syscall is either capable or incapable of returning an error.
	594	* If the return value is not an error, then it's the previous
	595	* personality value, which can be an arbitrary value
	596	* undistinguishable from an error value.
	597	* To make things clear, a second call is needed.
	598	*/
	599	if (personality(pers_value) < 0)
	600	err(EXIT_FAILURE, _("failed to set personality to %s"), arch);
	601	}
	602
05541825 KZ	603	/* make sure architecture is set as expected */
05541825 KZ	604	if (arch)
7f48cfb0	605	verify_arch_domain(doms, target, arch);
8b3a46d2	606
3fa06e04 KZ	607	if (!argc) {
	608	shell = "/bin/sh";
	609	shell_arg = "-sh";
	610	}
9508e297	611	if (verbose) {
3fa06e04	612	printf(_("Execute command `%s'.\n"), shell ? shell : argv[0]);
9508e297 RM	613	/* flush all output streams before exec */
	614	fflush(NULL);
	615	}
34c265f0	616
3fa06e04 KZ	617	/* Execute shell */
3fa06e04 KZ	618	if (shell) {
1b10fa0e	619	execl(shell, shell_arg, (char *)NULL);
3fa06e04	620	errexec(shell);
77eb13b9	621	}
8b3a46d2	622
3fa06e04	623	/* Execute on command line specified command */
77eb13b9	624	execvp(argv[0], argv);
fd777151	625	errexec(argv[0]);
8b3a46d2	626	}