2 * Copyright (C) 2003-2007 Red Hat, Inc.
4 * This file is part of util-linux.
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.
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.
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)
23 * based on ideas from the ppc32 util by Guy Streeter (2002-01), based on the
24 * sparc32 util by Jakub Jelinek (1998, 1999)
27 #include <sys/personality.h>
34 #include <sys/utsname.h>
37 #include "closestream.h"
39 #ifndef HAVE_PERSONALITY
41 # define personality(pers) ((long)syscall(SYS_personality, pers))
44 #define turn_on(_flag, _opts) \
48 printf(_("Switching on %s.\n"), #_flag); \
52 # define UNAME26 0x0020000
54 #ifndef ADDR_NO_RANDOMIZE
55 # define ADDR_NO_RANDOMIZE 0x0040000
57 #ifndef FDPIC_FUNCPTRS
58 # define FDPIC_FUNCPTRS 0x0080000
60 #ifndef MMAP_PAGE_ZERO
61 # define MMAP_PAGE_ZERO 0x0100000
63 #ifndef ADDR_COMPAT_LAYOUT
64 # define ADDR_COMPAT_LAYOUT 0x0200000
66 #ifndef READ_IMPLIES_EXEC
67 # define READ_IMPLIES_EXEC 0x0400000
69 #ifndef ADDR_LIMIT_32BIT
70 # define ADDR_LIMIT_32BIT 0x0800000
73 # define SHORT_INODE 0x1000000
76 # define WHOLE_SECONDS 0x2000000
78 #ifndef STICKY_TIMEOUTS
79 # define STICKY_TIMEOUTS 0x4000000
81 #ifndef ADDR_LIMIT_3GB
82 # define ADDR_LIMIT_3GB 0x8000000
85 static int archwrapper
;
87 static void __attribute__((__noreturn__
)) show_help(void)
89 fputs(USAGE_HEADER
, stdout
);
91 printf(_(" %s <arch> [options] [<program> [<argument>...]]\n"), program_invocation_short_name
);
93 printf(_(" %s [options] [<program> [<argument>...]]\n"), program_invocation_short_name
);
95 fputs(USAGE_SEPARATOR
, stdout
);
96 fputs(_("Change the reported architecture and set personality flags.\n"), stdout
);
98 fputs(USAGE_OPTIONS
, stdout
);
99 fputs(_(" -B, --32bit turns on ADDR_LIMIT_32BIT\n"), stdout
);
100 fputs(_(" -F, --fdpic-funcptrs makes function pointers point to descriptors\n"), stdout
);
101 fputs(_(" -I, --short-inode turns on SHORT_INODE\n"), stdout
);
102 fputs(_(" -L, --addr-compat-layout changes the way virtual memory is allocated\n"), stdout
);
103 fputs(_(" -R, --addr-no-randomize disables randomization of the virtual address space\n"), stdout
);
104 fputs(_(" -S, --whole-seconds turns on WHOLE_SECONDS\n"), stdout
);
105 fputs(_(" -T, --sticky-timeouts turns on STICKY_TIMEOUTS\n"), stdout
);
106 fputs(_(" -X, --read-implies-exec turns on READ_IMPLIES_EXEC\n"), stdout
);
107 fputs(_(" -Z, --mmap-page-zero turns on MMAP_PAGE_ZERO\n"), stdout
);
108 fputs(_(" -3, --3gb limits the used address space to a maximum of 3 GB\n"), stdout
);
109 fputs(_(" --4gb ignored (for backward compatibility only)\n"), stdout
);
110 fputs(_(" --uname-2.6 turns on UNAME26\n"), stdout
);
111 fputs(_(" -v, --verbose say what options are being switched on\n"), stdout
);
114 fputs(_(" --list list settable architectures, and exit\n"), stdout
);
116 fputs(USAGE_SEPARATOR
, stdout
);
117 fputs(USAGE_HELP
, stdout
);
118 fputs(USAGE_VERSION
, stdout
);
119 printf(USAGE_MAN_TAIL("setarch(8)"));
124 static void __attribute__((__noreturn__
)) show_usage(const char *s
)
128 _("%s\nTry `%s --help' for more information."), s
,
129 program_invocation_short_name
);
131 errx(EXIT_FAILURE
, _("Try `%s --help' for more information."),
132 program_invocation_short_name
);
135 static void __attribute__((__noreturn__
))
138 printf(UTIL_LINUX_VERSION
);
142 static int set_arch(const char *pers
, unsigned long options
, int list
)
146 unsigned long pers_value
;
150 const char *target_arch
, *result_arch
;
152 {UNAME26
, "uname26", NULL
},
153 {PER_LINUX32
, "linux32", NULL
},
154 {PER_LINUX
, "linux64", NULL
},
155 #if defined(__powerpc__) || defined(__powerpc64__)
156 # ifdef __BIG_ENDIAN__
157 {PER_LINUX32
, "ppc32", "ppc"},
158 {PER_LINUX32
, "ppc", "ppc"},
159 {PER_LINUX
, "ppc64", "ppc64"},
160 {PER_LINUX
, "ppc64pseries", "ppc64"},
161 {PER_LINUX
, "ppc64iseries", "ppc64"},
163 {PER_LINUX32
, "ppc32le", "ppcle"},
164 {PER_LINUX32
, "ppcle", "ppcle"},
165 {PER_LINUX
, "ppc64le", "ppc64le"},
168 #if defined(__x86_64__) || defined(__i386__) || defined(__ia64__)
169 {PER_LINUX32
, "i386", "i386"},
170 {PER_LINUX32
, "i486", "i386"},
171 {PER_LINUX32
, "i586", "i386"},
172 {PER_LINUX32
, "i686", "i386"},
173 {PER_LINUX32
, "athlon", "i386"},
175 #if defined(__x86_64__) || defined(__i386__)
176 {PER_LINUX
, "x86_64", "x86_64"},
178 #if defined(__ia64__) || defined(__i386__)
179 {PER_LINUX
, "ia64", "ia64"},
181 #if defined(__hppa__)
182 {PER_LINUX32
, "parisc32", "parisc"},
183 {PER_LINUX32
, "parisc", "parisc"},
184 {PER_LINUX
, "parisc64", "parisc64"},
186 #if defined(__s390x__) || defined(__s390__)
187 {PER_LINUX32
, "s390", "s390"},
188 {PER_LINUX
, "s390x", "s390x"},
190 #if defined(__sparc64__) || defined(__sparc__)
191 {PER_LINUX32
, "sparc", "sparc"},
192 {PER_LINUX32
, "sparc32bash", "sparc"},
193 {PER_LINUX32
, "sparc32", "sparc"},
194 {PER_LINUX
, "sparc64", "sparc64"},
196 #if defined(__mips64__) || defined(__mips__)
197 {PER_LINUX32
, "mips32", "mips"},
198 {PER_LINUX32
, "mips", "mips"},
199 {PER_LINUX
, "mips64", "mips64"},
201 #if defined(__alpha__)
202 {PER_LINUX
, "alpha", "alpha"},
203 {PER_LINUX
, "alphaev5", "alpha"},
204 {PER_LINUX
, "alphaev56", "alpha"},
205 {PER_LINUX
, "alphaev6", "alpha"},
206 {PER_LINUX
, "alphaev67", "alpha"},
208 /* place holder, will be filled up at runtime */
213 /* Add the trivial transition {PER_LINUX, machine, machine} if no
214 * such target_arch is hardcoded yet. */
216 for (i
= 0; transitions
[i
].perval
>= 0; i
++)
217 if (!strcmp(un
.machine
, transitions
[i
].target_arch
))
219 if (transitions
[i
].perval
< 0) {
220 unsigned long wrdsz
= CHAR_BIT
* sizeof(void *);
221 if (wrdsz
== 32 || wrdsz
== 64) {
222 /* fill up the place holder */
223 transitions
[i
].perval
= wrdsz
== 32 ? PER_LINUX32
: PER_LINUX
;
224 transitions
[i
].target_arch
= un
.machine
;
225 transitions
[i
].result_arch
= un
.machine
;
229 for (i
= 0; transitions
[i
].target_arch
!= NULL
; i
++)
230 printf("%s\n", transitions
[i
].target_arch
);
233 for (i
= 0; transitions
[i
].perval
>= 0; i
++)
234 if (!strcmp(pers
, transitions
[i
].target_arch
))
236 if (transitions
[i
].perval
< 0)
237 errx(EXIT_FAILURE
, _("%s: Unrecognized architecture"), pers
);
238 pers_value
= transitions
[i
].perval
| options
;
239 if (personality(pers_value
) == -EINVAL
)
242 if (transitions
[i
].result_arch
&& strcmp(un
.machine
, transitions
[i
].result_arch
)) {
243 if (strcmp(transitions
[i
].result_arch
, "i386")
244 || (strcmp(un
.machine
, "i486")
245 && strcmp(un
.machine
, "i586")
246 && strcmp(un
.machine
, "i686")
247 && strcmp(un
.machine
, "athlon")))
248 errx(EXIT_FAILURE
, _("Kernel cannot set architecture to %s"), pers
);
253 int main(int argc
, char *argv
[])
255 const char *arch
= NULL
;
256 unsigned long options
= 0;
260 /* Options without equivalent short options */
262 OPT_4GB
= CHAR_MAX
+ 1,
267 /* Options --3gb and --4gb are for compatibitity with an old
268 * Debian setarch implementation. */
269 static const struct option longopts
[] = {
270 {"help", no_argument
, NULL
, 'h'},
271 {"version", no_argument
, NULL
, 'V'},
272 {"verbose", no_argument
, NULL
, 'v'},
273 {"addr-no-randomize", no_argument
, NULL
, 'R'},
274 {"fdpic-funcptrs", no_argument
, NULL
, 'F'},
275 {"mmap-page-zero", no_argument
, NULL
, 'Z'},
276 {"addr-compat-layout", no_argument
, NULL
, 'L'},
277 {"read-implies-exec", no_argument
, NULL
, 'X'},
278 {"32bit", no_argument
, NULL
, 'B'},
279 {"short-inode", no_argument
, NULL
, 'I'},
280 {"whole-seconds", no_argument
, NULL
, 'S'},
281 {"sticky-timeouts", no_argument
, NULL
, 'T'},
282 {"3gb", no_argument
, NULL
, '3'},
283 {"4gb", no_argument
, NULL
, OPT_4GB
},
284 {"uname-2.6", no_argument
, NULL
, OPT_UNAME26
},
285 {"list", no_argument
, NULL
, OPT_LIST
},
289 setlocale(LC_ALL
, "");
290 bindtextdomain(PACKAGE
, LOCALEDIR
);
292 atexit(close_stdout
);
295 show_usage(_("Not enough arguments"));
297 archwrapper
= strcmp(program_invocation_short_name
, "setarch") != 0;
299 arch
= program_invocation_short_name
; /* symlinks to setarch */
301 if (1 < argc
&& *argv
[1] != '-') {
303 argv
[1] = argv
[0]; /* for getopt_long() to get the program name */
309 #if defined(__sparc64__) || defined(__sparc__)
310 if (archwrapper
&& strcmp(arch
, "sparc32bash") == 0) {
311 if (set_arch(arch
, 0L, 0))
312 err(EXIT_FAILURE
, _("Failed to set personality to %s"), p
);
313 execl("/bin/bash", NULL
);
314 err(EXIT_FAILURE
, _("failed to execute %s"), "/bin/bash");
318 while ((c
= getopt_long(argc
, argv
, "+hVv3BFILRSTXZ", longopts
, NULL
)) != -1) {
330 turn_on(ADDR_NO_RANDOMIZE
, options
);
333 turn_on(FDPIC_FUNCPTRS
, options
);
336 turn_on(MMAP_PAGE_ZERO
, options
);
339 turn_on(ADDR_COMPAT_LAYOUT
, options
);
342 turn_on(READ_IMPLIES_EXEC
, options
);
345 turn_on(ADDR_LIMIT_32BIT
, options
);
348 turn_on(SHORT_INODE
, options
);
351 turn_on(WHOLE_SECONDS
, options
);
354 turn_on(STICKY_TIMEOUTS
, options
);
357 turn_on(ADDR_LIMIT_3GB
, options
);
359 case OPT_4GB
: /* just ignore this one */
362 turn_on(UNAME26
, options
);
366 set_arch(NULL
, 0, 1);
369 warnx(_("unrecognized option '--list'"));
376 errx(EXIT_FAILURE
, _("no architecture argument specified"));
381 if (set_arch(arch
, options
, 0))
382 err(EXIT_FAILURE
, _("failed to set personality to %s"), arch
);
384 /* flush all output streams before exec */
388 execl("/bin/sh", "-sh", NULL
);
389 err(EXIT_FAILURE
, _("failed to execute %s"), "/bin/sh");
392 execvp(argv
[0], argv
);
393 err(EXIT_FAILURE
, "%s", argv
[0]);