scripts/qemu-binfmt-conf.sh

   1 #!/bin/sh
   2 # enable automatic i386/ARM/M68K/MIPS/SPARC/PPC/s390/HPPA
   3 # program execution by the kernel
   4
   5 qemu_target_list="i386 i486 alpha arm sparc32plus ppc ppc64 ppc64le m68k \
   6 mips mipsel mipsn32 mipsn32el mips64 mips64el \
   7 sh4 sh4eb s390x aarch64 hppa"
   8
   9 i386_magic='\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x03\x00'
  10 i386_mask='\xff\xff\xff\xff\xff\xfe\xfe\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
  11 i386_family=i386
  12
  13 i486_magic='\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x06\x00'
  14 i486_mask='\xff\xff\xff\xff\xff\xfe\xfe\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
  15 i486_family=i386
  16
  17 alpha_magic='\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x26\x90'
  18 alpha_mask='\xff\xff\xff\xff\xff\xfe\xfe\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
  19 alpha_family=alpha
  20
  21 arm_magic='\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x28\x00'
  22 arm_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
  23 arm_family=arm
  24
  25 armeb_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x28'
  26 armeb_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
  27 armeb_family=arm
  28
  29 sparc_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x02'
  30 sparc_mask='\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
  31 sparc_family=sparc
  32
  33 sparc32plus_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x12'
  34 sparc32plus_mask='\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
  35 sparc32plus_family=sparc
  36
  37 ppc_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x14'
  38 ppc_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
  39 ppc_family=ppc
  40
  41 ppc64_magic='\x7fELF\x02\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x15'
  42 ppc64_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
  43 ppc64_family=ppc
  44
  45 ppc64le_magic='\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x15\x00'
  46 ppc64le_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\x00'
  47 ppc64le_family=ppcle
  48
  49 m68k_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x04'
  50 m68k_mask='\xff\xff\xff\xff\xff\xff\xfe\xfe\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
  51 m68k_family=m68k
  52
  53 # FIXME: We could use the other endianness on a MIPS host.
  54
  55 mips_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08'
  56 mips_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
  57 mips_family=mips
  58
  59 mipsel_magic='\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08\x00'
  60 mipsel_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
  61 mipsel_family=mips
  62
  63 mipsn32_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08'
  64 mipsn32_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
  65 mipsn32_family=mips
  66
  67 mipsn32el_magic='\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08\x00'
  68 mipsn32el_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
  69 mipsn32el_family=mips
  70
  71 mips64_magic='\x7fELF\x02\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08'
  72 mips64_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
  73 mips64_family=mips
  74
  75 mips64el_magic='\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08\x00'
  76 mips64el_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
  77 mips64el_family=mips
  78
  79 sh4_magic='\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x2a\x00'
  80 sh4_mask='\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
  81 sh4_family=sh4
  82
  83 sh4eb_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x2a'
  84 sh4eb_mask='\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
  85 sh4eb_family=sh4
  86
  87 s390x_magic='\x7fELF\x02\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x16'
  88 s390x_mask='\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
  89 s390x_family=s390x
  90
  91 aarch64_magic='\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\xb7\x00'
  92 aarch64_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
  93 aarch64_family=arm
  94
  95 hppa_magic='\x7f\x45\x4c\x46\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x0f'
  96 hppa_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
  97 hppa_family=hppa
  98
  99 qemu_get_family() {
 100     cpu=${HOST_ARCH:-$(uname -m)}
 101     case "$cpu" in
 102     amd64|i386|i486|i586|i686|i86pc|BePC|x86_64)
 103         echo "i386"
 104         ;;
 105     mips*)
 106         echo "mips"
 107         ;;
 108     "Power Macintosh"|ppc64|powerpc|ppc)
 109         echo "ppc"
 110         ;;
 111     ppc64el|ppc64le)
 112         echo "ppcle"
 113         ;;
 114     arm|armel|armhf|arm64|armv[4-9]*)
 115         echo "arm"
 116         ;;
 117     sparc*)
 118         echo "sparc"
 119         ;;
 120     *)
 121         echo "$cpu"
 122         ;;
 123     esac
 124 }
 125
 126 usage() {
 127     cat <<EOF
 128 Usage: qemu-binfmt-conf.sh [--qemu-path PATH][--debian][--systemd CPU]
 129                            [--help][--credential yes|no][--exportdir PATH]
 130
 131        Configure binfmt_misc to use qemu interpreter
 132
 133        --help:       display this usage
 134        --qemu-path:  set path to qemu interpreter ($QEMU_PATH)
 135        --debian:     don't write into /proc,
 136                      instead generate update-binfmts templates
 137        --systemd:    don't write into /proc,
 138                      instead generate file for systemd-binfmt.service
 139                      for the given CPU
 140        --exportdir:  define where to write configuration files
 141                      (default: $SYSTEMDDIR or $DEBIANDIR)
 142        --credential: if yes, credential and security tokens are
 143                      calculated according to the binary to interpret
 144
 145     To import templates with update-binfmts, use :
 146
 147         sudo update-binfmts --importdir ${EXPORTDIR:-$DEBIANDIR} --import qemu-CPU
 148
 149     To remove interpreter, use :
 150
 151         sudo update-binfmts --package qemu-CPU --remove qemu-CPU $QEMU_PATH
 152
 153     With systemd, binfmt files are loaded by systemd-binfmt.service
 154
 155     The environment variable HOST_ARCH allows to override 'uname' to generate
 156     configuration files for a different architecture than the current one.
 157
 158     where CPU is one of:
 159
 160         $qemu_target_list
 161
 162 EOF
 163 }
 164
 165 qemu_check_access() {
 166     if [ ! -w "$1" ] ; then
 167         echo "ERROR: cannot write to $1" 1>&2
 168         exit 1
 169     fi
 170 }
 171
 172 qemu_check_bintfmt_misc() {
 173     # load the binfmt_misc module
 174     if [ ! -d /proc/sys/fs/binfmt_misc ]; then
 175       if ! /sbin/modprobe binfmt_misc ; then
 176           exit 1
 177       fi
 178     fi
 179     if [ ! -f /proc/sys/fs/binfmt_misc/register ]; then
 180       if ! mount binfmt_misc -t binfmt_misc /proc/sys/fs/binfmt_misc ; then
 181           exit 1
 182       fi
 183     fi
 184
 185     qemu_check_access /proc/sys/fs/binfmt_misc/register
 186 }
 187
 188 installed_dpkg() {
 189     dpkg --status "$1" > /dev/null 2>&1
 190 }
 191
 192 qemu_check_debian() {
 193     if [ ! -e /etc/debian_version ] ; then
 194         echo "WARNING: your system is not a Debian based distro" 1>&2
 195     elif ! installed_dpkg binfmt-support ; then
 196         echo "WARNING: package binfmt-support is needed" 1>&2
 197     fi
 198     qemu_check_access "$EXPORTDIR"
 199 }
 200
 201 qemu_check_systemd() {
 202     if ! systemctl -q is-enabled systemd-binfmt.service ; then
 203         echo "WARNING: systemd-binfmt.service is missing or disabled" 1>&2
 204     fi
 205     qemu_check_access "$EXPORTDIR"
 206 }
 207
 208 qemu_generate_register() {
 209     echo ":qemu-$cpu:M::$magic:$mask:$qemu:$FLAGS"
 210 }
 211
 212 qemu_register_interpreter() {
 213     echo "Setting $qemu as binfmt interpreter for $cpu"
 214     qemu_generate_register > /proc/sys/fs/binfmt_misc/register
 215 }
 216
 217 qemu_generate_systemd() {
 218     echo "Setting $qemu as binfmt interpreter for $cpu for systemd-binfmt.service"
 219     qemu_generate_register > "$EXPORTDIR/qemu-$cpu.conf"
 220 }
 221
 222 qemu_generate_debian() {
 223     cat > "$EXPORTDIR/qemu-$cpu" <<EOF
 224 package qemu-$cpu
 225 interpreter $qemu
 226 magic $magic
 227 mask $mask
 228 EOF
 229     if [ "$FLAGS" = "OC" ] ; then
 230         echo "credentials yes" >> "$EXPORTDIR/qemu-$cpu"
 231     fi
 232 }
 233
 234 qemu_set_binfmts() {
 235     # probe cpu type
 236     host_family=$(qemu_get_family)
 237
 238     # register the interpreter for each cpu except for the native one
 239
 240     for cpu in ${qemu_target_list} ; do
 241         magic=$(eval echo \$${cpu}_magic)
 242         mask=$(eval echo \$${cpu}_mask)
 243         family=$(eval echo \$${cpu}_family)
 244
 245         if [ "$magic" = "" ] || [ "$mask" = "" ] || [ "$family" = "" ] ; then
 246             echo "INTERNAL ERROR: unknown cpu $cpu" 1>&2
 247             continue
 248         fi
 249
 250         qemu="$QEMU_PATH/qemu-$cpu"
 251         if [ "$cpu" = "i486" ] ; then
 252             qemu="$QEMU_PATH/qemu-i386"
 253         fi
 254
 255         if [ "$host_family" != "$family" ] ; then
 256             $BINFMT_SET
 257         fi
 258     done
 259 }
 260
 261 CHECK=qemu_check_bintfmt_misc
 262 BINFMT_SET=qemu_register_interpreter
 263
 264 SYSTEMDDIR="/etc/binfmt.d"
 265 DEBIANDIR="/usr/share/binfmts"
 266
 267 QEMU_PATH=/usr/local/bin
 268 FLAGS=""
 269
 270 options=$(getopt -o ds:Q:e:hc: -l debian,systemd:,qemu-path:,exportdir:,help,credential: -- "$@")
 271 eval set -- "$options"
 272
 273 while true ; do
 274     case "$1" in
 275     -d|--debian)
 276         CHECK=qemu_check_debian
 277         BINFMT_SET=qemu_generate_debian
 278         EXPORTDIR=${EXPORTDIR:-$DEBIANDIR}
 279         ;;
 280     -s|--systemd)
 281         CHECK=qemu_check_systemd
 282         BINFMT_SET=qemu_generate_systemd
 283         EXPORTDIR=${EXPORTDIR:-$SYSTEMDDIR}
 284         shift
 285         # check given cpu is in the supported CPU list
 286         for cpu in ${qemu_target_list} ; do
 287             if [ "$cpu" = "$1" ] ; then
 288                 break
 289             fi
 290         done
 291
 292         if [ "$cpu" = "$1" ] ; then
 293             qemu_target_list="$1"
 294         else
 295             echo "ERROR: unknown CPU \"$1\"" 1>&2
 296             usage
 297             exit 1
 298         fi
 299         ;;
 300     -Q|--qemu-path)
 301         shift
 302         QEMU_PATH="$1"
 303         ;;
 304     -e|--exportdir)
 305         shift
 306         EXPORTDIR="$1"
 307         ;;
 308     -h|--help)
 309         usage
 310         exit 1
 311         ;;
 312     -c|--credential)
 313         shift
 314         if [ "$1" = "yes" ] ; then
 315             FLAGS="OC"
 316         else
 317             FLAGS=""
 318         fi
 319         ;;
 320     *)
 321         break
 322         ;;
 323     esac
 324     shift
 325 done
 326
 327 $CHECK
 328 qemu_set_binfmts