[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

#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)
		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(_("     --show[=personality] show current or specific personality 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(__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
03a254f0 TW	87	#define ALL_PERSONALITIES \
	88	X(PER_LINUX) \
	89	X(PER_LINUX_32BIT) \
	90	X(PER_LINUX_FDPIC) \
	91	X(PER_SVR4) \
	92	X(PER_SVR3) \
	93	X(PER_SCOSVR3) \
	94	X(PER_OSR5) \
	95	X(PER_WYSEV386) \
	96	X(PER_ISCR4) \
	97	X(PER_BSD) \
	98	X(PER_SUNOS) \
	99	X(PER_XENIX) \
	100	X(PER_LINUX32) \
	101	X(PER_LINUX32_3GB) \
	102	X(PER_IRIX32) \
	103	X(PER_IRIXN32) \
	104	X(PER_IRIX64) \
	105	X(PER_RISCOS) \
	106	X(PER_SOLARIS) \
	107	X(PER_UW7) \
	108	X(PER_OSF4) \
	109	X(PER_HPUX) \
	110
	111
	112	#define ALL_OPTIONS \
	113	X(UNAME26) \
	114	X(ADDR_NO_RANDOMIZE) \
	115	X(FDPIC_FUNCPTRS) \
	116	X(MMAP_PAGE_ZERO) \
	117	X(ADDR_COMPAT_LAYOUT) \
	118	X(READ_IMPLIES_EXEC) \
	119	X(ADDR_LIMIT_32BIT) \
	120	X(SHORT_INODE) \
	121	X(WHOLE_SECONDS) \
	122	X(STICKY_TIMEOUTS) \
	123	X(ADDR_LIMIT_3GB) \
	124
5edb0ea6	125
1db8bf93 KZ	126	struct arch_domain {
	127	int perval; /* PER_* */
	128	const char *target_arch;
	129	const char *result_arch;
	130	};
	131
	132
cbfa1442	133	static void __attribute__((__noreturn__)) usage(int archwrapper)
8b3a46d2	134	{
77eb13b9	135	fputs(USAGE_HEADER, stdout);
5edb0ea6	136	if (!archwrapper)
05541825	137	printf(_(" %s [<arch>] [options] [<program> [<argument>...]]\n"), program_invocation_short_name);
68243049 BS	138	else
68243049 BS	139	printf(_(" %s [options] [<program> [<argument>...]]\n"), program_invocation_short_name);
451dbcfa BS	140
	141	fputs(USAGE_SEPARATOR, stdout);
	142	fputs(_("Change the reported architecture and set personality flags.\n"), stdout);
	143
77eb13b9	144	fputs(USAGE_OPTIONS, stdout);
77eb13b9	145	fputs(_(" -B, --32bit turns on ADDR_LIMIT_32BIT\n"), stdout);
26b0b857	146	fputs(_(" -F, --fdpic-funcptrs makes function pointers point to descriptors\n"), stdout);
77eb13b9	147	fputs(_(" -I, --short-inode turns on SHORT_INODE\n"), stdout);
26b0b857 BS	148	fputs(_(" -L, --addr-compat-layout changes the way virtual memory is allocated\n"), stdout);
26b0b857 BS	149	fputs(_(" -R, --addr-no-randomize disables randomization of the virtual address space\n"), stdout);
77eb13b9 SK	150	fputs(_(" -S, --whole-seconds turns on WHOLE_SECONDS\n"), stdout);
77eb13b9 SK	151	fputs(_(" -T, --sticky-timeouts turns on STICKY_TIMEOUTS\n"), stdout);
26b0b857 BS	152	fputs(_(" -X, --read-implies-exec turns on READ_IMPLIES_EXEC\n"), stdout);
26b0b857 BS	153	fputs(_(" -Z, --mmap-page-zero turns on MMAP_PAGE_ZERO\n"), stdout);
77eb13b9 SK	154	fputs(_(" -3, --3gb limits the used address space to a maximum of 3 GB\n"), stdout);
	155	fputs(_(" --4gb ignored (for backward compatibility only)\n"), stdout);
	156	fputs(_(" --uname-2.6 turns on UNAME26\n"), stdout);
26b0b857	157	fputs(_(" -v, --verbose say what options are being switched on\n"), stdout);
5edb0ea6	158
03a254f0	159	if (!archwrapper) {
5edb0ea6	160	fputs(_(" --list list settable architectures, and exit\n"), stdout);
03a254f0 TW	161	fputs(_(" --show[=personality] show current or specific personality and exit\n"), stdout);
03a254f0 TW	162	}
26b0b857	163
77eb13b9	164	fputs(USAGE_SEPARATOR, stdout);
f45f3ec3	165	printf(USAGE_HELP_OPTIONS(26));
77eb13b9	166	printf(USAGE_MAN_TAIL("setarch(8)"));
26b0b857	167
77eb13b9	168	exit(EXIT_SUCCESS);
8b3a46d2 KZ	169	}
8b3a46d2 KZ	170
1db8bf93 KZ	171	/*
	172	* Returns inilialized list of all available execution domains.
	173	*/
	174	static struct arch_domain *init_arch_domains(void)
8b3a46d2	175	{
33e87bf1	176	static struct utsname un;
1db8bf93	177	size_t i;
77eb13b9	178
1db8bf93 KZ	179	static struct arch_domain transitions[] =
1db8bf93 KZ	180	{
77eb13b9 SK	181	{UNAME26, "uname26", NULL},
	182	{PER_LINUX32, "linux32", NULL},
	183	{PER_LINUX, "linux64", NULL},
8b3a46d2	184	#if defined(__powerpc__) \|\| defined(__powerpc64__)
77eb13b9 SK	185	# ifdef __BIG_ENDIAN__
	186	{PER_LINUX32, "ppc32", "ppc"},
	187	{PER_LINUX32, "ppc", "ppc"},
	188	{PER_LINUX, "ppc64", "ppc64"},
	189	{PER_LINUX, "ppc64pseries", "ppc64"},
	190	{PER_LINUX, "ppc64iseries", "ppc64"},
	191	# else
e60b6df5 KZ	192	{PER_LINUX32, "ppc32", "ppcle"},
e60b6df5 KZ	193	{PER_LINUX32, "ppc", "ppcle"},
d9ca5dd4 RM	194	{PER_LINUX32, "ppc32le", "ppcle"},
	195	{PER_LINUX32, "ppcle", "ppcle"},
	196	{PER_LINUX, "ppc64le", "ppc64le"},
77eb13b9	197	# endif
8b3a46d2 KZ	198	#endif
8b3a46d2 KZ	199	#if defined(__x86_64__) \|\| defined(__i386__) \|\| defined(__ia64__)
77eb13b9 SK	200	{PER_LINUX32, "i386", "i386"},
	201	{PER_LINUX32, "i486", "i386"},
	202	{PER_LINUX32, "i586", "i386"},
	203	{PER_LINUX32, "i686", "i386"},
	204	{PER_LINUX32, "athlon", "i386"},
8b3a46d2 KZ	205	#endif
8b3a46d2 KZ	206	#if defined(__x86_64__) \|\| defined(__i386__)
77eb13b9	207	{PER_LINUX, "x86_64", "x86_64"},
8b3a46d2 KZ	208	#endif
8b3a46d2 KZ	209	#if defined(__ia64__) \|\| defined(__i386__)
77eb13b9	210	{PER_LINUX, "ia64", "ia64"},
8b3a46d2	211	#endif
782e198d	212	#if defined(__hppa__)
77eb13b9 SK	213	{PER_LINUX32, "parisc32", "parisc"},
	214	{PER_LINUX32, "parisc", "parisc"},
	215	{PER_LINUX, "parisc64", "parisc64"},
782e198d	216	#endif
8b3a46d2	217	#if defined(__s390x__) \|\| defined(__s390__)
77eb13b9 SK	218	{PER_LINUX32, "s390", "s390"},
77eb13b9 SK	219	{PER_LINUX, "s390x", "s390x"},
8b3a46d2 KZ	220	#endif
8b3a46d2 KZ	221	#if defined(__sparc64__) \|\| defined(__sparc__)
77eb13b9 SK	222	{PER_LINUX32, "sparc", "sparc"},
	223	{PER_LINUX32, "sparc32bash", "sparc"},
	224	{PER_LINUX32, "sparc32", "sparc"},
	225	{PER_LINUX, "sparc64", "sparc64"},
8b3a46d2 KZ	226	#endif
8b3a46d2 KZ	227	#if defined(__mips64__) \|\| defined(__mips__)
77eb13b9 SK	228	{PER_LINUX32, "mips32", "mips"},
	229	{PER_LINUX32, "mips", "mips"},
	230	{PER_LINUX, "mips64", "mips64"},
9e19737a BC	231	#endif
9e19737a BC	232	#if defined(__alpha__)
77eb13b9 SK	233	{PER_LINUX, "alpha", "alpha"},
	234	{PER_LINUX, "alphaev5", "alpha"},
	235	{PER_LINUX, "alphaev56", "alpha"},
	236	{PER_LINUX, "alphaev6", "alpha"},
	237	{PER_LINUX, "alphaev67", "alpha"},
146900d4	238	#endif
f791eea8 EL	239	#if defined(__loongarch__)
	240	{PER_LINUX, "loongarch", "loongarch64"},
	241	{PER_LINUX, "loongarch64", "loongarch64"},
	242	#endif
146900d4 AS	243	#if defined(__e2k__)
	244	{PER_LINUX, "e2k", "e2k"},
	245	{PER_LINUX, "e2kv4", "e2k"},
	246	{PER_LINUX, "e2kv5", "e2k"},
	247	{PER_LINUX, "e2kv6", "e2k"},
	248	{PER_LINUX, "e2k4c", "e2k"},
	249	{PER_LINUX, "e2k8c", "e2k"},
	250	{PER_LINUX, "e2k1cp", "e2k"},
	251	{PER_LINUX, "e2k8c2", "e2k"},
	252	{PER_LINUX, "e2k12c", "e2k"},
	253	{PER_LINUX, "e2k16c", "e2k"},
	254	{PER_LINUX, "e2k2c3", "e2k"},
9fd01b10 AG	255	#endif
	256	#if defined(__arm__) \|\| defined(__aarch64__)
	257	# ifdef __BIG_ENDIAN__
	258	{PER_LINUX32, "armv7b", "arm"},
	259	{PER_LINUX32, "armv8b", "arm"},
	260	# else
	261	{PER_LINUX32, "armv7l", "arm"},
	262	{PER_LINUX32, "armv8l", "arm"},
	263	# endif
	264	{PER_LINUX32, "armh", "arm"},
	265	{PER_LINUX32, "arm", "arm"},
	266	{PER_LINUX, "arm64", "aarch64"},
	267	{PER_LINUX, "aarch64", "aarch64"},
a3c05171 MB	268	#endif
	269	#if defined(__riscv)
	270	{PER_LINUX32, "riscv32", "riscv32"},
	271	{PER_LINUX32, "rv32", "riscv32"},
	272	{PER_LINUX, "riscv64", "riscv64"},
	273	{PER_LINUX, "rv64", "riscv64"},
8b3a46d2	274	#endif
77eb13b9 SK	275	/* place holder, will be filled up at runtime */
	276	{-1, NULL, NULL},
	277	{-1, NULL, NULL}
	278	};
	279
	280	/* Add the trivial transition {PER_LINUX, machine, machine} if no
	281	* such target_arch is hardcoded yet. */
	282	uname(&un);
	283	for (i = 0; transitions[i].perval >= 0; i++)
	284	if (!strcmp(un.machine, transitions[i].target_arch))
	285	break;
	286	if (transitions[i].perval < 0) {
035fc2d9 TW	287	int wrdsz = sysfs_get_address_bits(NULL);
	288	if (wrdsz < 0)
	289	wrdsz = CHAR_BIT * sizeof(void *);
77eb13b9 SK	290	if (wrdsz == 32 \|\| wrdsz == 64) {
	291	/* fill up the place holder */
	292	transitions[i].perval = wrdsz == 32 ? PER_LINUX32 : PER_LINUX;
	293	transitions[i].target_arch = un.machine;
	294	transitions[i].result_arch = un.machine;
	295	}
ae2c3b5b	296	}
1db8bf93 KZ	297
	298	return transitions;
	299	}
	300
	301	/*
	302	* List all execution domains from transitions
	303	*/
	304	static void list_arch_domains(struct arch_domain *doms)
	305	{
	306	struct arch_domain *d;
	307
	308	for (d = doms; d->target_arch != NULL; d++)
	309	printf("%s\n", d->target_arch);
	310	}
	311
	312	static struct arch_domain get_arch_domain(struct arch_domain doms, const char *pers)
	313	{
	314	struct arch_domain *d;
	315
cf5debba	316	for (d = doms; d && d->perval >= 0; d++) {
1db8bf93	317	if (!strcmp(pers, d->target_arch))
77eb13b9	318	break;
ae706576	319	}
1db8bf93 KZ	320
	321	return !d \|\| d->perval < 0 ? NULL : d;
	322	}
	323
7f48cfb0	324	static void verify_arch_domain(struct arch_domain doms, struct arch_domain target, const char *wanted)
1db8bf93 KZ	325	{
	326	struct utsname un;
	327
7f48cfb0	328	if (!doms \|\| !target \|\| !target->result_arch)
1db8bf93 KZ	329	return;
1db8bf93 KZ	330
77eb13b9	331	uname(&un);
7f48cfb0 AG	332
	333	if (!strcmp(un.machine, target->result_arch))
	334	return;
	335
9fd01b10 AG	336	if (!strcmp(target->result_arch, "i386") \|\|
9fd01b10 AG	337	!strcmp(target->result_arch, "arm")) {
7f48cfb0 AG	338	struct arch_domain *dom;
	339	for (dom = doms; dom->target_arch != NULL; dom++) {
	340	if (!dom->result_arch \|\| strcmp(dom->result_arch, target->result_arch))
	341	continue;
	342	if (!strcmp(dom->target_arch, un.machine))
	343	return;
	344	}
77eb13b9	345	}
7f48cfb0 AG	346
7f48cfb0 AG	347	errx(EXIT_FAILURE, _("Kernel cannot set architecture to %s"), wanted);
8b3a46d2 KZ	348	}
8b3a46d2 KZ	349
03a254f0 TW	350	static const struct { int value; const char * const name; } all_personalities[] = {
	351	#define X(opt) { .value = opt, .name = #opt },
	352	ALL_PERSONALITIES
	353	#undef X
	354	};
	355
	356	static const struct { int value; const char * const name; } all_options[] = {
	357	#define X(opt) { .value = opt, .name = #opt },
	358	ALL_OPTIONS
	359	#undef X
	360	};
	361
	362	static void show_personality(int pers)
	363	{
	364	int options;
	365	size_t i;
	366
	367	/* Test for exact matches including options */
	368	for (i = 0; i < ARRAY_SIZE(all_personalities); i++) {
	369	if (pers == all_personalities[i].value) {
	370	printf("%s\n", all_personalities[i].name);
	371	return;
	372	}
	373	}
	374
	375	options = pers & ~PER_MASK;
	376	pers &= PER_MASK;
	377
	378	/* Second test for type-only matches */
	379	for (i = 0; i < ARRAY_SIZE(all_personalities); i++) {
	380	if (pers == all_personalities[i].value) {
	381	printf("%s", all_personalities[i].name);
	382	break;
	383	}
	384	}
	385
	386	if (i == ARRAY_SIZE(all_personalities))
	387	printf("0x%02x", pers);
	388
	389	if (options) {
	390	printf(" (");
	391
	392	for (i = 0; i < ARRAY_SIZE(all_options); i++) {
	393	if (options & all_options[i].value) {
	394	printf("%s", all_options[i].name);
	395
	396	options &= ~all_options[i].value;
	397	if (options)
	398	printf(" ");
	399	}
	400	}
	401	if (options)
	402	printf("0x%08x", options);
	403	printf(")");
	404	}
	405	printf("\n");
	406	}
	407
	408	static void show_current_personality(void)
	409	{
	410	int pers = personality(0xffffffff);
	411	if (pers == -1)
	412	err(EXIT_FAILURE, _("Can not get current kernel personality"));
	413
414	show_personality(pers);
415	}
416
8b3a46d2 KZ	417	int main(int argc, char *argv[])
8b3a46d2 KZ	418	{
5edb0ea6	419	const char *arch = NULL;
77eb13b9 SK	420	unsigned long options = 0;
77eb13b9 SK	421	int verbose = 0;
cbfa1442	422	int archwrapper;
77eb13b9	423	int c;
7f48cfb0	424	struct arch_domain doms = NULL, target = NULL;
1db8bf93	425	unsigned long pers_value = 0;
3fa06e04	426	char shell = NULL, shell_arg = NULL;
77eb13b9	427
5edb0ea6 KZ	428	/* Options without equivalent short options */
	429	enum {
	430	OPT_4GB = CHAR_MAX + 1,
	431	OPT_UNAME26,
03a254f0 TW	432	OPT_LIST,
03a254f0 TW	433	OPT_SHOW,
5edb0ea6 KZ	434	};
5edb0ea6 KZ	435
9e930041	436	/* Options --3gb and --4gb are for compatibility with an old
77eb13b9 SK	437	* Debian setarch implementation. */
77eb13b9 SK	438	static const struct option longopts[] = {
03a254f0 TW	439	{"help", no_argument, NULL, 'h'},
	440	{"version", no_argument, NULL, 'V'},
	441	{"verbose", no_argument, NULL, 'v'},
	442	{"addr-no-randomize", no_argument, NULL, 'R'},
	443	{"fdpic-funcptrs", no_argument, NULL, 'F'},
	444	{"mmap-page-zero", no_argument, NULL, 'Z'},
	445	{"addr-compat-layout", no_argument, NULL, 'L'},
	446	{"read-implies-exec", no_argument, NULL, 'X'},
	447	{"32bit", no_argument, NULL, 'B'},
	448	{"short-inode", no_argument, NULL, 'I'},
	449	{"whole-seconds", no_argument, NULL, 'S'},
	450	{"sticky-timeouts", no_argument, NULL, 'T'},
	451	{"3gb", no_argument, NULL, '3'},
	452	{"4gb", no_argument, NULL, OPT_4GB},
	453	{"uname-2.6", no_argument, NULL, OPT_UNAME26},
	454	{"list", no_argument, NULL, OPT_LIST},
	455	{"show", optional_argument, NULL, OPT_SHOW},
	456	{NULL, 0, NULL, 0}
77eb13b9 SK	457	};
	458
	459	setlocale(LC_ALL, "");
	460	bindtextdomain(PACKAGE, LOCALEDIR);
	461	textdomain(PACKAGE);
2c308875	462	close_stdout_atexit();
77eb13b9	463
7a87a774 RM	464	if (argc < 1) {
	465	warnx(_("Not enough arguments"));
	466	errtryhelp(EXIT_FAILURE);
	467	}
5edb0ea6	468	archwrapper = strcmp(program_invocation_short_name, "setarch") != 0;
cbfa1442	469	if (archwrapper) {
5edb0ea6	470	arch = program_invocation_short_name; /* symlinks to setarch */
3fa06e04 KZ	471
	472	/* Don't use ifdef sparc here, we get "Unrecognized architecture"
	473	* error message later if necessary */
cbfa1442	474	if (strcmp(arch, "sparc32bash") == 0) {
3fa06e04 KZ	475	shell = "/bin/bash";
	476	shell_arg = "";
	477	goto set_arch;
cbfa1442	478	}
cbfa1442	479	} else {
00b5ef70	480	if (1 < argc && *argv[1] != '-') {
5edb0ea6 KZ	481	arch = argv[1];
	482	argv[1] = argv[0]; /* for getopt_long() to get the program name */
	483	argv++;
	484	argc--;
77eb13b9 SK	485	}
77eb13b9 SK	486	}
5edb0ea6	487
77eb13b9 SK	488	while ((c = getopt_long(argc, argv, "+hVv3BFILRSTXZ", longopts, NULL)) != -1) {
77eb13b9 SK	489	switch (c) {
77eb13b9 SK	490	case 'v':
	491	verbose = 1;
	492	break;
	493	case 'R':
	494	turn_on(ADDR_NO_RANDOMIZE, options);
	495	break;
	496	case 'F':
	497	turn_on(FDPIC_FUNCPTRS, options);
	498	break;
	499	case 'Z':
	500	turn_on(MMAP_PAGE_ZERO, options);
	501	break;
	502	case 'L':
	503	turn_on(ADDR_COMPAT_LAYOUT, options);
	504	break;
	505	case 'X':
	506	turn_on(READ_IMPLIES_EXEC, options);
	507	break;
	508	case 'B':
	509	turn_on(ADDR_LIMIT_32BIT, options);
	510	break;
	511	case 'I':
	512	turn_on(SHORT_INODE, options);
	513	break;
	514	case 'S':
	515	turn_on(WHOLE_SECONDS, options);
	516	break;
	517	case 'T':
	518	turn_on(STICKY_TIMEOUTS, options);
	519	break;
	520	case '3':
	521	turn_on(ADDR_LIMIT_3GB, options);
	522	break;
	523	case OPT_4GB: /* just ignore this one */
	524	break;
	525	case OPT_UNAME26:
	526	turn_on(UNAME26, options);
	527	break;
5edb0ea6 KZ	528	case OPT_LIST:
5edb0ea6 KZ	529	if (!archwrapper) {
1db8bf93	530	list_arch_domains(init_arch_domains());
b2b5b502	531	return EXIT_SUCCESS;
5edb0ea6 KZ	532	} else
5edb0ea6 KZ	533	warnx(_("unrecognized option '--list'"));
03a254f0 TW	534	goto error_getopts;
	535	case OPT_SHOW:
	536	if (!archwrapper) {
	537	if (!optarg \|\| strcmp(optarg, "current") == 0)
	538	show_current_personality();
	539	else
	540	show_personality(str2num_or_err(
	541	optarg, 16,
	542	_("could not parse personality"),
	543	0, INT_MAX));
	544	return EXIT_SUCCESS;
	545	} else
	546	warnx(_("unrecognized option '--show'"));
	547	goto error_getopts;
2c308875	548
03a254f0	549	error_getopts:
77eb13b9	550	default:
677ec86c	551	errtryhelp(EXIT_FAILURE);
2c308875 KZ	552	case 'h':
	553	usage(archwrapper);
	554	case 'V':
	555	print_version(EXIT_SUCCESS);
77eb13b9 SK	556	}
77eb13b9 SK	557	}
8b3a46d2	558
05541825 KZ	559	if (!arch && !options)
05541825 KZ	560	errx(EXIT_FAILURE, _("no architecture argument or personality flags specified"));
5edb0ea6	561
77eb13b9 SK	562	argc -= optind;
77eb13b9 SK	563	argv += optind;
8df90dec	564
3fa06e04	565	set_arch:
05541825 KZ	566	/* get execution domain (architecture) */
	567	if (arch) {
	568	doms = init_arch_domains();
	569	target = get_arch_domain(doms, arch);
1db8bf93	570
05541825 KZ	571	if (!target)
	572	errx(EXIT_FAILURE, _("%s: Unrecognized architecture"), arch);
	573	pers_value = target->perval;
	574	}
	575
	576	/* add personality flags */
	577	pers_value \|= options;
1db8bf93	578
05541825	579	/* call kernel */
1db8bf93 KZ	580	if (personality(pers_value) < 0) {
	581	/*
	582	* Depending on architecture and kernel version, personality
	583	* syscall is either capable or incapable of returning an error.
	584	* If the return value is not an error, then it's the previous
	585	* personality value, which can be an arbitrary value
	586	* undistinguishable from an error value.
	587	* To make things clear, a second call is needed.
	588	*/
	589	if (personality(pers_value) < 0)
	590	err(EXIT_FAILURE, _("failed to set personality to %s"), arch);
	591	}
	592
05541825 KZ	593	/* make sure architecture is set as expected */
05541825 KZ	594	if (arch)
7f48cfb0	595	verify_arch_domain(doms, target, arch);
8b3a46d2	596
3fa06e04 KZ	597	if (!argc) {
	598	shell = "/bin/sh";
	599	shell_arg = "-sh";
	600	}
9508e297	601	if (verbose) {
3fa06e04	602	printf(_("Execute command `%s'.\n"), shell ? shell : argv[0]);
9508e297 RM	603	/* flush all output streams before exec */
	604	fflush(NULL);
	605	}
34c265f0	606
3fa06e04 KZ	607	/* Execute shell */
3fa06e04 KZ	608	if (shell) {
1b10fa0e	609	execl(shell, shell_arg, (char *)NULL);
3fa06e04	610	errexec(shell);
77eb13b9	611	}
8b3a46d2	612
3fa06e04	613	/* Execute on command line specified command */
77eb13b9	614	execvp(argv[0], argv);
fd777151	615	errexec(argv[0]);
8b3a46d2	616	}