xref: /openbmc/qemu/scripts/qemu-binfmt-conf.sh (revision 92e28c03) 
1#!/bin/sh
2# Enable automatic program execution by the kernel.
3
4qemu_target_list="i386 i486 alpha arm armeb sparc sparc32plus sparc64 \
5ppc ppc64 ppc64le m68k mips mipsel mipsn32 mipsn32el mips64 mips64el \
6sh4 sh4eb s390x aarch64 aarch64_be hppa riscv32 riscv64 xtensa xtensaeb \
7microblaze microblazeel or1k x86_64 hexagon"
8
9i386_magic='\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x03\x00'
10i386_mask='\xff\xff\xff\xff\xff\xfe\xfe\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
11i386_family=i386
12
13i486_magic='\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x06\x00'
14i486_mask='\xff\xff\xff\xff\xff\xfe\xfe\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
15i486_family=i386
16
17x86_64_magic='\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x3e\x00'
18x86_64_mask='\xff\xff\xff\xff\xff\xfe\xfe\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
19x86_64_family=i386
20
21alpha_magic='\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x26\x90'
22alpha_mask='\xff\xff\xff\xff\xff\xfe\xfe\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
23alpha_family=alpha
24
25arm_magic='\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x28\x00'
26arm_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
27arm_family=arm
28
29armeb_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x28'
30armeb_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
31armeb_family=armeb
32
33sparc_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x02'
34sparc_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
35sparc_family=sparc
36
37sparc32plus_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x12'
38sparc32plus_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
39sparc32plus_family=sparc
40
41sparc64_magic='\x7fELF\x02\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x2b'
42sparc64_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
43sparc64_family=sparc
44
45ppc_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x14'
46ppc_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
47ppc_family=ppc
48
49ppc64_magic='\x7fELF\x02\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x15'
50ppc64_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
51ppc64_family=ppc
52
53ppc64le_magic='\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x15\x00'
54ppc64le_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\x00'
55ppc64le_family=ppcle
56
57m68k_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x04'
58m68k_mask='\xff\xff\xff\xff\xff\xff\xfe\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
59m68k_family=m68k
60
61# FIXME: We could use the other endianness on a MIPS host.
62
63mips_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08'
64mips_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
65mips_family=mips
66
67mipsel_magic='\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08\x00'
68mipsel_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
69mipsel_family=mips
70
71mipsn32_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08'
72mipsn32_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
73mipsn32_family=mips
74
75mipsn32el_magic='\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08\x00'
76mipsn32el_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
77mipsn32el_family=mips
78
79mips64_magic='\x7fELF\x02\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08'
80mips64_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
81mips64_family=mips
82
83mips64el_magic='\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08\x00'
84mips64el_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
85mips64el_family=mips
86
87sh4_magic='\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x2a\x00'
88sh4_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
89sh4_family=sh4
90
91sh4eb_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x2a'
92sh4eb_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
93sh4eb_family=sh4
94
95s390x_magic='\x7fELF\x02\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x16'
96s390x_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
97s390x_family=s390x
98
99aarch64_magic='\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\xb7\x00'
100aarch64_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
101aarch64_family=arm
102
103aarch64_be_magic='\x7fELF\x02\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\xb7'
104aarch64_be_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
105aarch64_be_family=armeb
106
107hppa_magic='\x7f\x45\x4c\x46\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x0f'
108hppa_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
109hppa_family=hppa
110
111riscv32_magic='\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\xf3\x00'
112riscv32_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
113riscv32_family=riscv
114
115riscv64_magic='\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\xf3\x00'
116riscv64_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
117riscv64_family=riscv
118
119xtensa_magic='\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x5e\x00'
120xtensa_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
121xtensa_family=xtensa
122
123xtensaeb_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x5e'
124xtensaeb_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
125xtensaeb_family=xtensaeb
126
127microblaze_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\xba\xab'
128microblaze_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
129microblaze_family=microblaze
130
131microblazeel_magic='\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\xab\xba'
132microblazeel_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
133microblazeel_family=microblazeel
134
135or1k_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x5c'
136or1k_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
137or1k_family=or1k
138
139hexagon_magic='\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\xa4\x00'
140hexagon_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
141hexagon_family=hexagon
142
143qemu_get_family() {
144    cpu=${HOST_ARCH:-$(uname -m)}
145    case "$cpu" in
146    amd64|i386|i486|i586|i686|i86pc|BePC|x86_64)
147        echo "i386"
148        ;;
149    mips*)
150        echo "mips"
151        ;;
152    "Power Macintosh"|ppc64|powerpc|ppc)
153        echo "ppc"
154        ;;
155    ppc64el|ppc64le)
156        echo "ppcle"
157        ;;
158    arm|armel|armhf|arm64|armv[4-9]*l|aarch64)
159        echo "arm"
160        ;;
161    armeb|armv[4-9]*b|aarch64_be)
162        echo "armeb"
163        ;;
164    sparc*)
165        echo "sparc"
166        ;;
167    riscv*)
168        echo "riscv"
169        ;;
170    *)
171        echo "$cpu"
172        ;;
173    esac
174}
175
176usage() {
177    cat <<EOF
178Usage: qemu-binfmt-conf.sh [--qemu-path PATH][--debian][--systemd CPU]
179                           [--help][--credential yes|no][--exportdir PATH]
180                           [--persistent yes|no][--qemu-suffix SUFFIX]
181                           [--preserve-argv0 yes|no]
182
183       Configure binfmt_misc to use qemu interpreter
184
185       --help:          display this usage
186       --qemu-path:     set path to qemu interpreter ($QEMU_PATH)
187       --qemu-suffix:   add a suffix to the default interpreter name
188       --debian:        don't write into /proc,
189                        instead generate update-binfmts templates
190       --systemd:       don't write into /proc,
191                        instead generate file for systemd-binfmt.service
192                        for the given CPU. If CPU is "ALL", generate a
193                        file for all known cpus
194       --exportdir:     define where to write configuration files
195                        (default: $SYSTEMDDIR or $DEBIANDIR)
196       --credential:    if yes, credential and security tokens are
197                        calculated according to the binary to interpret
198       --persistent:    if yes, the interpreter is loaded when binfmt is
199                        configured and remains in memory. All future uses
200                        are cloned from the open file.
201       --preserve-argv0 preserve argv[0]
202
203    To import templates with update-binfmts, use :
204
205        sudo update-binfmts --importdir ${EXPORTDIR:-$DEBIANDIR} --import qemu-CPU
206
207    To remove interpreter, use :
208
209        sudo update-binfmts --package qemu-CPU --remove qemu-CPU $QEMU_PATH
210
211    With systemd, binfmt files are loaded by systemd-binfmt.service
212
213    The environment variable HOST_ARCH allows to override 'uname' to generate
214    configuration files for a different architecture than the current one.
215
216    where CPU is one of:
217
218        $qemu_target_list
219
220EOF
221}
222
223qemu_check_access() {
224    if [ ! -w "$1" ] ; then
225        echo "ERROR: cannot write to $1" 1>&2
226        exit 1
227    fi
228}
229
230qemu_check_bintfmt_misc() {
231    # load the binfmt_misc module
232    if [ ! -d /proc/sys/fs/binfmt_misc ]; then
233      if ! /sbin/modprobe binfmt_misc ; then
234          exit 1
235      fi
236    fi
237    if [ ! -f /proc/sys/fs/binfmt_misc/register ]; then
238      if ! mount binfmt_misc -t binfmt_misc /proc/sys/fs/binfmt_misc ; then
239          exit 1
240      fi
241    fi
242
243    qemu_check_access /proc/sys/fs/binfmt_misc/register
244}
245
246installed_dpkg() {
247    dpkg --status "$1" > /dev/null 2>&1
248}
249
250qemu_check_debian() {
251    if [ ! -e /etc/debian_version ] ; then
252        echo "WARNING: your system is not a Debian based distro" 1>&2
253    elif ! installed_dpkg binfmt-support ; then
254        echo "WARNING: package binfmt-support is needed" 1>&2
255    fi
256    qemu_check_access "$EXPORTDIR"
257}
258
259qemu_check_systemd() {
260    if ! systemctl -q is-enabled systemd-binfmt.service ; then
261        echo "WARNING: systemd-binfmt.service is missing or disabled" 1>&2
262    fi
263    qemu_check_access "$EXPORTDIR"
264}
265
266qemu_generate_register() {
267    flags=""
268    if [ "$CREDENTIAL" = "yes" ] ; then
269        flags="OC"
270    fi
271    if [ "$PERSISTENT" = "yes" ] ; then
272        flags="${flags}F"
273    fi
274    if [ "$PRESERVE_ARG0" = "yes" ] ; then
275        flags="${flags}P"
276    fi
277
278    echo ":qemu-$cpu:M::$magic:$mask:$qemu:$flags"
279}
280
281qemu_register_interpreter() {
282    echo "Setting $qemu as binfmt interpreter for $cpu"
283    qemu_generate_register > /proc/sys/fs/binfmt_misc/register
284}
285
286qemu_generate_systemd() {
287    echo "Setting $qemu as binfmt interpreter for $cpu for systemd-binfmt.service"
288    qemu_generate_register > "$EXPORTDIR/qemu-$cpu.conf"
289}
290
291qemu_generate_debian() {
292    cat > "$EXPORTDIR/qemu-$cpu" <<EOF
293package qemu-$cpu
294interpreter $qemu
295magic $magic
296mask $mask
297credentials $CREDENTIAL
298preserve $PRESERVE_ARG0
299fix_binary $PERSISTENT
300EOF
301}
302
303qemu_set_binfmts() {
304    # probe cpu type
305    host_family=$(qemu_get_family)
306
307    # register the interpreter for each cpu except for the native one
308
309    for cpu in ${qemu_target_list} ; do
310        magic=$(eval echo \$${cpu}_magic)
311        mask=$(eval echo \$${cpu}_mask)
312        family=$(eval echo \$${cpu}_family)
313
314        if [ "$magic" = "" ] || [ "$mask" = "" ] || [ "$family" = "" ] ; then
315            echo "INTERNAL ERROR: unknown cpu $cpu" 1>&2
316            continue
317        fi
318
319        qemu="$QEMU_PATH/qemu-$cpu"
320        if [ "$cpu" = "i486" ] ; then
321            qemu="$QEMU_PATH/qemu-i386"
322        fi
323
324        qemu="$qemu$QEMU_SUFFIX"
325        if [ "$host_family" != "$family" ] ; then
326            $BINFMT_SET
327        fi
328    done
329}
330
331CHECK=qemu_check_bintfmt_misc
332BINFMT_SET=qemu_register_interpreter
333
334SYSTEMDDIR="/etc/binfmt.d"
335DEBIANDIR="/usr/share/binfmts"
336
337QEMU_PATH=/usr/local/bin
338CREDENTIAL=no
339PERSISTENT=no
340PRESERVE_ARG0=no
341QEMU_SUFFIX=""
342
343_longopts="debian,systemd:,qemu-path:,qemu-suffix:,exportdir:,help,credential:,\
344persistent:,preserve-argv0:"
345options=$(getopt -o ds:Q:S:e:hc:p:g:F: -l ${_longopts} -- "$@")
346eval set -- "$options"
347
348while true ; do
349    case "$1" in
350    -d|--debian)
351        CHECK=qemu_check_debian
352        BINFMT_SET=qemu_generate_debian
353        EXPORTDIR=${EXPORTDIR:-$DEBIANDIR}
354        ;;
355    -s|--systemd)
356        CHECK=qemu_check_systemd
357        BINFMT_SET=qemu_generate_systemd
358        EXPORTDIR=${EXPORTDIR:-$SYSTEMDDIR}
359        shift
360        # check given cpu is in the supported CPU list
361        if [ "$1" != "ALL" ] ; then
362            for cpu in ${qemu_target_list} ; do
363                if [ "$cpu" = "$1" ] ; then
364                    break
365                fi
366            done
367
368            if [ "$cpu" = "$1" ] ; then
369                qemu_target_list="$1"
370            else
371                echo "ERROR: unknown CPU \"$1\"" 1>&2
372                usage
373                exit 1
374            fi
375        fi
376        ;;
377    -Q|--qemu-path)
378        shift
379        QEMU_PATH="$1"
380        ;;
381    -F|--qemu-suffix)
382        shift
383        QEMU_SUFFIX="$1"
384        ;;
385    -e|--exportdir)
386        shift
387        EXPORTDIR="$1"
388        ;;
389    -h|--help)
390        usage
391        exit 1
392        ;;
393    -c|--credential)
394        shift
395        CREDENTIAL="$1"
396        ;;
397    -p|--persistent)
398        shift
399        PERSISTENT="$1"
400        ;;
401    -g|--preserve-argv0)
402        shift
403        PRESERVE_ARG0="$1"
404        ;;
405    *)
406        break
407        ;;
408    esac
409    shift
410done
411
412$CHECK
413qemu_set_binfmts
414