xref: /openbmc/qemu/scripts/qemu-binfmt-conf.sh (revision 4fe6d78b) 
1#!/bin/sh
2# enable automatic i386/ARM/M68K/MIPS/SPARC/PPC/s390/HPPA
3# program execution by the kernel
4
5qemu_target_list="i386 i486 alpha arm armeb sparc32plus ppc ppc64 ppc64le m68k \
6mips mipsel mipsn32 mipsn32el mips64 mips64el \
7sh4 sh4eb s390x aarch64 aarch64_be hppa"
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\xff\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\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
15i486_family=i386
16
17alpha_magic='\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x26\x90'
18alpha_mask='\xff\xff\xff\xff\xff\xfe\xfe\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
19alpha_family=alpha
20
21arm_magic='\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x28\x00'
22arm_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
23arm_family=arm
24
25armeb_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x28'
26armeb_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
27armeb_family=armeb
28
29sparc_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x02'
30sparc_mask='\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
31sparc_family=sparc
32
33sparc32plus_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x12'
34sparc32plus_mask='\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
35sparc32plus_family=sparc
36
37ppc_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x14'
38ppc_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
39ppc_family=ppc
40
41ppc64_magic='\x7fELF\x02\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x15'
42ppc64_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
43ppc64_family=ppc
44
45ppc64le_magic='\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x15\x00'
46ppc64le_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\x00'
47ppc64le_family=ppcle
48
49m68k_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x04'
50m68k_mask='\xff\xff\xff\xff\xff\xff\xfe\xfe\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
51m68k_family=m68k
52
53# FIXME: We could use the other endianness on a MIPS host.
54
55mips_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08'
56mips_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
57mips_family=mips
58
59mipsel_magic='\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08\x00'
60mipsel_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
61mipsel_family=mips
62
63mipsn32_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08'
64mipsn32_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
65mipsn32_family=mips
66
67mipsn32el_magic='\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08\x00'
68mipsn32el_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
69mipsn32el_family=mips
70
71mips64_magic='\x7fELF\x02\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08'
72mips64_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
73mips64_family=mips
74
75mips64el_magic='\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08\x00'
76mips64el_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
77mips64el_family=mips
78
79sh4_magic='\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x2a\x00'
80sh4_mask='\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
81sh4_family=sh4
82
83sh4eb_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x2a'
84sh4eb_mask='\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
85sh4eb_family=sh4
86
87s390x_magic='\x7fELF\x02\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x16'
88s390x_mask='\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
89s390x_family=s390x
90
91aarch64_magic='\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\xb7\x00'
92aarch64_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
93aarch64_family=arm
94
95aarch64_be_magic='\x7fELF\x02\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\xb7'
96aarch64_be_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
97aarch64_be_family=armeb
98
99hppa_magic='\x7f\x45\x4c\x46\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x0f'
100hppa_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
101hppa_family=hppa
102
103qemu_get_family() {
104    cpu=${HOST_ARCH:-$(uname -m)}
105    case "$cpu" in
106    amd64|i386|i486|i586|i686|i86pc|BePC|x86_64)
107        echo "i386"
108        ;;
109    mips*)
110        echo "mips"
111        ;;
112    "Power Macintosh"|ppc64|powerpc|ppc)
113        echo "ppc"
114        ;;
115    ppc64el|ppc64le)
116        echo "ppcle"
117        ;;
118    arm|armel|armhf|arm64|armv[4-9]*l|aarch64)
119        echo "arm"
120        ;;
121    armeb|armv[4-9]*b|aarch64_be)
122        echo "armeb"
123        ;;
124    sparc*)
125        echo "sparc"
126        ;;
127    *)
128        echo "$cpu"
129        ;;
130    esac
131}
132
133usage() {
134    cat <<EOF
135Usage: qemu-binfmt-conf.sh [--qemu-path PATH][--debian][--systemd CPU]
136                           [--help][--credential yes|no][--exportdir PATH]
137
138       Configure binfmt_misc to use qemu interpreter
139
140       --help:       display this usage
141       --qemu-path:  set path to qemu interpreter ($QEMU_PATH)
142       --debian:     don't write into /proc,
143                     instead generate update-binfmts templates
144       --systemd:    don't write into /proc,
145                     instead generate file for systemd-binfmt.service
146                     for the given CPU
147       --exportdir:  define where to write configuration files
148                     (default: $SYSTEMDDIR or $DEBIANDIR)
149       --credential: if yes, credential and security tokens are
150                     calculated according to the binary to interpret
151
152    To import templates with update-binfmts, use :
153
154        sudo update-binfmts --importdir ${EXPORTDIR:-$DEBIANDIR} --import qemu-CPU
155
156    To remove interpreter, use :
157
158        sudo update-binfmts --package qemu-CPU --remove qemu-CPU $QEMU_PATH
159
160    With systemd, binfmt files are loaded by systemd-binfmt.service
161
162    The environment variable HOST_ARCH allows to override 'uname' to generate
163    configuration files for a different architecture than the current one.
164
165    where CPU is one of:
166
167        $qemu_target_list
168
169EOF
170}
171
172qemu_check_access() {
173    if [ ! -w "$1" ] ; then
174        echo "ERROR: cannot write to $1" 1>&2
175        exit 1
176    fi
177}
178
179qemu_check_bintfmt_misc() {
180    # load the binfmt_misc module
181    if [ ! -d /proc/sys/fs/binfmt_misc ]; then
182      if ! /sbin/modprobe binfmt_misc ; then
183          exit 1
184      fi
185    fi
186    if [ ! -f /proc/sys/fs/binfmt_misc/register ]; then
187      if ! mount binfmt_misc -t binfmt_misc /proc/sys/fs/binfmt_misc ; then
188          exit 1
189      fi
190    fi
191
192    qemu_check_access /proc/sys/fs/binfmt_misc/register
193}
194
195installed_dpkg() {
196    dpkg --status "$1" > /dev/null 2>&1
197}
198
199qemu_check_debian() {
200    if [ ! -e /etc/debian_version ] ; then
201        echo "WARNING: your system is not a Debian based distro" 1>&2
202    elif ! installed_dpkg binfmt-support ; then
203        echo "WARNING: package binfmt-support is needed" 1>&2
204    fi
205    qemu_check_access "$EXPORTDIR"
206}
207
208qemu_check_systemd() {
209    if ! systemctl -q is-enabled systemd-binfmt.service ; then
210        echo "WARNING: systemd-binfmt.service is missing or disabled" 1>&2
211    fi
212    qemu_check_access "$EXPORTDIR"
213}
214
215qemu_generate_register() {
216    echo ":qemu-$cpu:M::$magic:$mask:$qemu:$FLAGS"
217}
218
219qemu_register_interpreter() {
220    echo "Setting $qemu as binfmt interpreter for $cpu"
221    qemu_generate_register > /proc/sys/fs/binfmt_misc/register
222}
223
224qemu_generate_systemd() {
225    echo "Setting $qemu as binfmt interpreter for $cpu for systemd-binfmt.service"
226    qemu_generate_register > "$EXPORTDIR/qemu-$cpu.conf"
227}
228
229qemu_generate_debian() {
230    cat > "$EXPORTDIR/qemu-$cpu" <<EOF
231package qemu-$cpu
232interpreter $qemu
233magic $magic
234mask $mask
235EOF
236    if [ "$FLAGS" = "OC" ] ; then
237        echo "credentials yes" >> "$EXPORTDIR/qemu-$cpu"
238    fi
239}
240
241qemu_set_binfmts() {
242    # probe cpu type
243    host_family=$(qemu_get_family)
244
245    # register the interpreter for each cpu except for the native one
246
247    for cpu in ${qemu_target_list} ; do
248        magic=$(eval echo \$${cpu}_magic)
249        mask=$(eval echo \$${cpu}_mask)
250        family=$(eval echo \$${cpu}_family)
251
252        if [ "$magic" = "" ] || [ "$mask" = "" ] || [ "$family" = "" ] ; then
253            echo "INTERNAL ERROR: unknown cpu $cpu" 1>&2
254            continue
255        fi
256
257        qemu="$QEMU_PATH/qemu-$cpu"
258        if [ "$cpu" = "i486" ] ; then
259            qemu="$QEMU_PATH/qemu-i386"
260        fi
261
262        if [ "$host_family" != "$family" ] ; then
263            $BINFMT_SET
264        fi
265    done
266}
267
268CHECK=qemu_check_bintfmt_misc
269BINFMT_SET=qemu_register_interpreter
270
271SYSTEMDDIR="/etc/binfmt.d"
272DEBIANDIR="/usr/share/binfmts"
273
274QEMU_PATH=/usr/local/bin
275FLAGS=""
276
277options=$(getopt -o ds:Q:e:hc: -l debian,systemd:,qemu-path:,exportdir:,help,credential: -- "$@")
278eval set -- "$options"
279
280while true ; do
281    case "$1" in
282    -d|--debian)
283        CHECK=qemu_check_debian
284        BINFMT_SET=qemu_generate_debian
285        EXPORTDIR=${EXPORTDIR:-$DEBIANDIR}
286        ;;
287    -s|--systemd)
288        CHECK=qemu_check_systemd
289        BINFMT_SET=qemu_generate_systemd
290        EXPORTDIR=${EXPORTDIR:-$SYSTEMDDIR}
291        shift
292        # check given cpu is in the supported CPU list
293        for cpu in ${qemu_target_list} ; do
294            if [ "$cpu" = "$1" ] ; then
295                break
296            fi
297        done
298
299        if [ "$cpu" = "$1" ] ; then
300            qemu_target_list="$1"
301        else
302            echo "ERROR: unknown CPU \"$1\"" 1>&2
303            usage
304            exit 1
305        fi
306        ;;
307    -Q|--qemu-path)
308        shift
309        QEMU_PATH="$1"
310        ;;
311    -e|--exportdir)
312        shift
313        EXPORTDIR="$1"
314        ;;
315    -h|--help)
316        usage
317        exit 1
318        ;;
319    -c|--credential)
320        shift
321        if [ "$1" = "yes" ] ; then
322            FLAGS="OC"
323        else
324            FLAGS=""
325        fi
326        ;;
327    *)
328        break
329        ;;
330    esac
331    shift
332done
333
334$CHECK
335qemu_set_binfmts
336