xref: /openbmc/qemu/scripts/qemu-binfmt-conf.sh (revision daa76aa416b1e18ab1fac650ff53d966d8f21f68) 
1#!/bin/sh
2# enable automatic i386/ARM/M68K/MIPS/SPARC/PPC/s390 program execution by the kernel
3
4qemu_target_list="i386 i486 alpha arm sparc32plus ppc ppc64 ppc64le m68k \
5mips mipsel mipsn32 mipsn32el mips64 mips64el \
6sh4 sh4eb s390x aarch64"
7
8i386_magic='\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x03\x00'
9i386_mask='\xff\xff\xff\xff\xff\xfe\xfe\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
10i386_family=i386
11
12i486_magic='\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x06\x00'
13i486_mask='\xff\xff\xff\xff\xff\xfe\xfe\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
14i486_family=i386
15
16alpha_magic='\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x26\x90'
17alpha_mask='\xff\xff\xff\xff\xff\xfe\xfe\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
18alpha_family=alpha
19
20arm_magic='\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x28\x00'
21arm_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
22arm_family=arm
23
24armeb_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x28'
25armeb_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
26armeb_family=arm
27
28sparc_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x02'
29sparc_mask='\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
30sparc_family=sparc
31
32sparc32plus_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x12'
33sparc32plus_mask='\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
34sparc32plus_family=sparc
35
36ppc_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x14'
37ppc_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
38ppc_family=ppc
39
40ppc64_magic='\x7fELF\x02\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x15'
41ppc64_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
42ppc64_family=ppc
43
44ppc64le_magic='\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x15\x00'
45ppc64le_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\x00'
46ppc64le_family=ppcle
47
48m68k_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x04'
49m68k_mask='\xff\xff\xff\xff\xff\xff\xfe\xfe\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
50m68k_family=m68k
51
52# FIXME: We could use the other endianness on a MIPS host.
53
54mips_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08'
55mips_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
56mips_family=mips
57
58mipsel_magic='\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08\x00'
59mipsel_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
60mipsel_family=mips
61
62mipsn32_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08'
63mipsn32_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
64mipsn32_family=mips
65
66mipsn32el_magic='\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08\x00'
67mipsn32el_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
68mipsn32el_family=mips
69
70mips64_magic='\x7fELF\x02\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08'
71mips64_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
72mips64_family=mips
73
74mips64el_magic='\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08\x00'
75mips64el_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
76mips64el_family=mips
77
78sh4_magic='\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x2a\x00'
79sh4_mask='\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
80sh4_family=sh4
81
82sh4eb_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x2a'
83sh4eb_mask='\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
84sh4eb_family=sh4
85
86s390x_magic='\x7fELF\x02\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x16'
87s390x_mask='\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
88s390x_family=s390x
89
90aarch64_magic='\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\xb7\x00'
91aarch64_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
92aarch64_family=arm
93
94qemu_get_family() {
95    cpu=${HOST_ARCH:-$(uname -m)}
96    case "$cpu" in
97    amd64|i386|i486|i586|i686|i86pc|BePC|x86_64)
98        echo "i386"
99        ;;
100    mips*)
101        echo "mips"
102        ;;
103    "Power Macintosh"|ppc64|powerpc|ppc)
104        echo "ppc"
105        ;;
106    ppc64el|ppc64le)
107        echo "ppcle"
108        ;;
109    arm|armel|armhf|arm64|armv[4-9]*)
110        echo "arm"
111        ;;
112    sparc*)
113        echo "sparc"
114        ;;
115    *)
116        echo "$cpu"
117        ;;
118    esac
119}
120
121usage() {
122    cat <<EOF
123Usage: qemu-binfmt-conf.sh [--qemu-path PATH][--debian][--systemd CPU]
124                           [--help][--credential yes|no][--exportdir PATH]
125
126       Configure binfmt_misc to use qemu interpreter
127
128       --help:       display this usage
129       --qemu-path:  set path to qemu interpreter ($QEMU_PATH)
130       --debian:     don't write into /proc,
131                     instead generate update-binfmts templates
132       --systemd:    don't write into /proc,
133                     instead generate file for systemd-binfmt.service
134                     for the given CPU
135       --exportdir:  define where to write configuration files
136                     (default: $SYSTEMDDIR or $DEBIANDIR)
137       --credential: if yes, credential and security tokens are
138                     calculated according to the binary to interpret
139
140    To import templates with update-binfmts, use :
141
142        sudo update-binfmts --importdir ${EXPORTDIR:-$DEBIANDIR} --import qemu-CPU
143
144    To remove interpreter, use :
145
146        sudo update-binfmts --package qemu-CPU --remove qemu-CPU $QEMU_PATH
147
148    With systemd, binfmt files are loaded by systemd-binfmt.service
149
150    The environment variable HOST_ARCH allows to override 'uname' to generate
151    configuration files for a different architecture than the current one.
152
153    where CPU is one of:
154
155        $qemu_target_list
156
157EOF
158}
159
160qemu_check_access() {
161    if [ ! -w "$1" ] ; then
162        echo "ERROR: cannot write to $1" 1>&2
163        exit 1
164    fi
165}
166
167qemu_check_bintfmt_misc() {
168    # load the binfmt_misc module
169    if [ ! -d /proc/sys/fs/binfmt_misc ]; then
170      if ! /sbin/modprobe binfmt_misc ; then
171          exit 1
172      fi
173    fi
174    if [ ! -f /proc/sys/fs/binfmt_misc/register ]; then
175      if ! mount binfmt_misc -t binfmt_misc /proc/sys/fs/binfmt_misc ; then
176          exit 1
177      fi
178    fi
179
180    qemu_check_access /proc/sys/fs/binfmt_misc/register
181}
182
183installed_dpkg() {
184    dpkg --status "$1" > /dev/null 2>&1
185}
186
187qemu_check_debian() {
188    if [ ! -e /etc/debian_version ] ; then
189        echo "WARNING: your system is not a Debian based distro" 1>&2
190    elif ! installed_dpkg binfmt-support ; then
191        echo "WARNING: package binfmt-support is needed" 1>&2
192    fi
193    qemu_check_access "$EXPORTDIR"
194}
195
196qemu_check_systemd() {
197    if ! systemctl -q is-enabled systemd-binfmt.service ; then
198        echo "WARNING: systemd-binfmt.service is missing or disabled" 1>&2
199    fi
200    qemu_check_access "$EXPORTDIR"
201}
202
203qemu_generate_register() {
204    echo ":qemu-$cpu:M::$magic:$mask:$qemu:$FLAGS"
205}
206
207qemu_register_interpreter() {
208    echo "Setting $qemu as binfmt interpreter for $cpu"
209    qemu_generate_register > /proc/sys/fs/binfmt_misc/register
210}
211
212qemu_generate_systemd() {
213    echo "Setting $qemu as binfmt interpreter for $cpu for systemd-binfmt.service"
214    qemu_generate_register > "$EXPORTDIR/qemu-$cpu.conf"
215}
216
217qemu_generate_debian() {
218    cat > "$EXPORTDIR/qemu-$cpu" <<EOF
219package qemu-$cpu
220interpreter $qemu
221magic $magic
222mask $mask
223EOF
224    if [ "$FLAGS" = "OC" ] ; then
225        echo "credentials yes" >> "$EXPORTDIR/qemu-$cpu"
226    fi
227}
228
229qemu_set_binfmts() {
230    # probe cpu type
231    host_family=$(qemu_get_family)
232
233    # register the interpreter for each cpu except for the native one
234
235    for cpu in ${qemu_target_list} ; do
236        magic=$(eval echo \$${cpu}_magic)
237        mask=$(eval echo \$${cpu}_mask)
238        family=$(eval echo \$${cpu}_family)
239
240        if [ "$magic" = "" ] || [ "$mask" = "" ] || [ "$family" = "" ] ; then
241            echo "INTERNAL ERROR: unknown cpu $cpu" 1>&2
242            continue
243        fi
244
245        qemu="$QEMU_PATH/qemu-$cpu"
246        if [ "$cpu" = "i486" ] ; then
247            qemu="$QEMU_PATH/qemu-i386"
248        fi
249
250        if [ "$host_family" != "$family" ] ; then
251            $BINFMT_SET
252        fi
253    done
254}
255
256CHECK=qemu_check_bintfmt_misc
257BINFMT_SET=qemu_register_interpreter
258
259SYSTEMDDIR="/etc/binfmt.d"
260DEBIANDIR="/usr/share/binfmts"
261
262QEMU_PATH=/usr/local/bin
263FLAGS=""
264
265options=$(getopt -o ds:Q:e:hc: -l debian,systemd:,qemu-path:,exportdir:,help,credential: -- "$@")
266eval set -- "$options"
267
268while true ; do
269    case "$1" in
270    -d|--debian)
271        CHECK=qemu_check_debian
272        BINFMT_SET=qemu_generate_debian
273        EXPORTDIR=${EXPORTDIR:-$DEBIANDIR}
274        ;;
275    -s|--systemd)
276        CHECK=qemu_check_systemd
277        BINFMT_SET=qemu_generate_systemd
278        EXPORTDIR=${EXPORTDIR:-$SYSTEMDDIR}
279        shift
280        # check given cpu is in the supported CPU list
281        for cpu in ${qemu_target_list} ; do
282            if [ "$cpu" == "$1" ] ; then
283                break
284            fi
285        done
286
287        if [ "$cpu" == "$1" ] ; then
288            qemu_target_list="$1"
289        else
290            echo "ERROR: unknown CPU \"$1\"" 1>&2
291            usage
292            exit 1
293        fi
294        ;;
295    -Q|--qemu-path)
296        shift
297        QEMU_PATH="$1"
298        ;;
299    -e|--exportdir)
300        shift
301        EXPORTDIR="$1"
302        ;;
303    -h|--help)
304        usage
305        exit 1
306        ;;
307    -c|--credential)
308        shift
309        if [ "$1" = "yes" ] ; then
310            FLAGS="OC"
311        else
312            FLAGS=""
313        fi
314        ;;
315    *)
316        break
317        ;;
318    esac
319    shift
320done
321
322$CHECK
323qemu_set_binfmts
324