[1/3] scripts: extract ELF magics from qemu-binfmt-conf.sh

Signed-off-by: Laurent Vivier <laurent@vivier.eu>
---
 scripts/binfmts-magic       |   93 ++++++++++++++++++++++++++++++++++++++
 scripts/qemu-binfmt-conf.sh |  104 +++++++++++++++++++------------------------
 2 files changed, 140 insertions(+), 57 deletions(-)
 create mode 100644 scripts/binfmts-magic
 mode change 100644 => 100755 scripts/qemu-binfmt-conf.sh

On 20.01.2013, at 00:20, Laurent Vivier wrote:

> Signed-off-by: Laurent Vivier <laurent@vivier.eu>
> ---
> scripts/binfmts-magic       |   93 ++++++++++++++++++++++++++++++++++++++
> scripts/qemu-binfmt-conf.sh |  104 +++++++++++++++++++------------------------
> 2 files changed, 140 insertions(+), 57 deletions(-)
> create mode 100644 scripts/binfmts-magic
> mode change 100644 => 100755 scripts/qemu-binfmt-conf.sh
> 
> diff --git a/scripts/binfmts-magic b/scripts/binfmts-magic
> new file mode 100644
> index 0000000..13ac820
> --- /dev/null
> +++ b/scripts/binfmts-magic
> @@ -0,0 +1,93 @@
> +qemu_target_list="i386 i486 alpha arm sparc ppc m68k mips mipsel \
> +                  mipsn32 mipsn32el mips64 mips64el sh4 sh4eb s390x"
> +
> +i386_magic='\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x03\x00'
> +i386_mask='\xff\xff\xff\xff\xff\xfe\xfe\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
> +i386_family=i386
> +
> +i486_magic='\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x06\x00'
> +i486_mask='\xff\xff\xff\xff\xff\xfe\xfe\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
> +i486_family=i386
> +
> +alpha_magic='\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x26\x90'
> +alpha_mask='\xff\xff\xff\xff\xff\xfe\xfe\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
> +alpha_family=alpha
> +
> +arm_magic='\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x28\x00'
> +arm_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
> +arm_family=arm
> +
> +armeb_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x28'
> +armeb_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
> +armeb_family=arm
> +
> +sparc_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x02'
> +sparc_mask='\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
> +sparc_family=sparc
> +
> +ppc_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x14'
> +ppc_mask='\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
> +ppc_family=ppc
> +
> +m68k_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x04'
> +m68k_mask='\xff\xff\xff\xff\xff\xff\xfe\xfe\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
> +m68k_family=m68k
> +
> +# FIXME: We could use the other endianness on a MIPS host.
> +
> +mips_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08'
> +mips_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
> +mips_family=mips
> +
> +mipsel_magic='\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08\x00'
> +mipsel_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
> +mipsel_family=mips
> +
> +mipsn32_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08'
> +mipsn32_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
> +mipsn32_family=mips
> +
> +mipsn32el_magic='\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08\x00'
> +mipsn32el_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
> +mipsn32el_family=mips
> +
> +mips64_magic='\x7fELF\x02\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08'
> +mips64_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
> +mips64_family=mips
> +
> +mips64el_magic='\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08\x00'
> +mips64el_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
> +mips64el_family=mips
> +
> +sh4_magic='\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x2a\x00'
> +sh4_mask='\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
> +sh4_family=sh4
> +
> +sh4eb_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x2a'
> +sh4eb_mask='\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
> +sh4eb_family=sh4
> +
> +s390x_magic='\x7fELF\x02\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x16'
> +s390x_mask='\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
> +s390x_family=s390x
> +
> +qemu_get_family() {
> +    cpu=$(uname -m)
> +    case "$cpu" in
> +    i386|i486|i586|i686|i86pc|BePC|x86_64)
> +        echo "i386"
> +        ;;
> +    mips*)
> +        echo "mips"
> +        ;;
> +    "Power Macintosh"|ppc64)
> +        echo "ppc"
> +        ;;
> +    armv[4-9]*)
> +        echo "arm"
> +        ;;
> +    *)
> +        echo "$cpu"
> +        ;;
> +    esac
> +}
> diff --git a/scripts/qemu-binfmt-conf.sh b/scripts/qemu-binfmt-conf.sh
> old mode 100644
> new mode 100755
> index 0da2618..6235637
> --- a/scripts/qemu-binfmt-conf.sh
> +++ b/scripts/qemu-binfmt-conf.sh
> @@ -1,69 +1,59 @@
> #!/bin/sh
> # enable automatic i386/ARM/M68K/MIPS/SPARC/PPC/s390 program execution by the kernel
> 
> +MAGIC=$(dirname $(readlink -f "$0"))/binfmts-magic

Wouldn't that break with $0 is in PATH?


Alex

> +
> +if [ ! -e "$MAGIC" ] ; then
> +    echo "ERROR: file $MAGIC is missing !" 1>&2
> +    exit 1
> +fi
> +
> +. "$MAGIC"
> +
> +QEMU_PATH="$1"
> +if [ "$QEMU_PATH" = "" ] ; then
> +    QEMU_PATH=/usr/local/bin
> +fi
> +
> # load the binfmt_misc module
> if [ ! -d /proc/sys/fs/binfmt_misc ]; then
> -  /sbin/modprobe binfmt_misc
> +  if ! /sbin/modprobe binfmt_misc ; then
> +      exit 1
> +  fi
> fi
> if [ ! -f /proc/sys/fs/binfmt_misc/register ]; then
> -  mount binfmt_misc -t binfmt_misc /proc/sys/fs/binfmt_misc
> +  if ! mount binfmt_misc -t binfmt_misc /proc/sys/fs/binfmt_misc ; then
> +      exit 1
> +  fi
> +fi
> +
> +if [ ! -w /proc/sys/fs/binfmt_misc/register ] ; then
> +    echo "ERROR: cannot write to /proc/sys/fs/binfmt_misc/register" 1>&2
> +    exit 1
> fi
> 
> # probe cpu type
> -cpu=`uname -m`
> -case "$cpu" in
> -  i386|i486|i586|i686|i86pc|BePC|x86_64)
> -    cpu="i386"
> -  ;;
> -  m68k)
> -    cpu="m68k"
> -  ;;
> -  mips*)
> -    cpu="mips"
> -  ;;
> -  "Power Macintosh"|ppc|ppc64)
> -    cpu="ppc"
> -  ;;
> -  armv[4-9]*)
> -    cpu="arm"
> -  ;;
> -esac
> +host_family=$(qemu_get_family)
> 
> # register the interpreter for each cpu except for the native one
> -if [ $cpu != "i386" ] ; then
> -    echo ':i386:M::\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x03\x00:\xff\xff\xff\xff\xff\xfe\xfe\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff:/usr/local/bin/qemu-i386:' > /proc/sys/fs/binfmt_misc/register
> -    echo ':i486:M::\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x06\x00:\xff\xff\xff\xff\xff\xfe\xfe\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff:/usr/local/bin/qemu-i386:' > /proc/sys/fs/binfmt_misc/register
> -fi
> -if [ $cpu != "alpha" ] ; then
> -    echo ':alpha:M::\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x26\x90:\xff\xff\xff\xff\xff\xfe\xfe\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff:/usr/local/bin/qemu-alpha:' > /proc/sys/fs/binfmt_misc/register
> -fi
> -if [ $cpu != "arm" ] ; then
> -    echo   ':arm:M::\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x28\x00:\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff:/usr/local/bin/qemu-arm:' > /proc/sys/fs/binfmt_misc/register
> -    echo   ':armeb:M::\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x28:\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff:/usr/local/bin/qemu-armeb:' > /proc/sys/fs/binfmt_misc/register
> -fi
> -if [ $cpu != "sparc" ] ; then
> -    echo   ':sparc:M::\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x02:\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff:/usr/local/bin/qemu-sparc:' > /proc/sys/fs/binfmt_misc/register
> -fi
> -if [ $cpu != "ppc" ] ; then
> -    echo   ':ppc:M::\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x14:\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff:/usr/local/bin/qemu-ppc:' > /proc/sys/fs/binfmt_misc/register
> -fi
> -if [ $cpu != "m68k" ] ; then
> -    echo   'Please check cpu value and header information for m68k!'
> -    echo   ':m68k:M::\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x04:\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff:/usr/local/bin/qemu-m68k:' > /proc/sys/fs/binfmt_misc/register
> -fi
> -if [ $cpu != "mips" ] ; then
> -    # FIXME: We could use the other endianness on a MIPS host.
> -    echo   ':mips:M::\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08:\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff:/usr/local/bin/qemu-mips:' > /proc/sys/fs/binfmt_misc/register
> -    echo   ':mipsel:M::\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08\x00:\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff:/usr/local/bin/qemu-mipsel:' > /proc/sys/fs/binfmt_misc/register
> -    echo   ':mipsn32:M::\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08:\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff:/usr/local/bin/qemu-mipsn32:' > /proc/sys/fs/binfmt_misc/register
> -    echo   ':mipsn32el:M::\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08\x00:\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff:/usr/local/bin/qemu-mipsn32el:' > /proc/sys/fs/binfmt_misc/register
> -    echo   ':mips64:M::\x7fELF\x02\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08:\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff:/usr/local/bin/qemu-mips64:' > /proc/sys/fs/binfmt_misc/register
> -    echo   ':mips64el:M::\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08\x00:\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff:/usr/local/bin/qemu-mips64el:' > /proc/sys/fs/binfmt_misc/register
> -fi
> -if [ $cpu != "sh" ] ; then
> -    echo    ':sh4:M::\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x2a\x00:\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff:/usr/local/bin/qemu-sh4:' > /proc/sys/fs/binfmt_misc/register
> -    echo    ':sh4eb:M::\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x2a:\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff:/usr/local/bin/qemu-sh4eb:' > /proc/sys/fs/binfmt_misc/register
> -fi
> -if [ $cpu != "s390x" ] ; then
> -    echo   ':s390x:M::\x7fELF\x02\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x16:\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff:/usr/local/bin/qemu-s390x:' > /proc/sys/fs/binfmt_misc/register
> -fi
> +
> +for cpu in ${qemu_target_list} ; do
> +    magic=$(eval echo \$${cpu}_magic)
> +    mask=$(eval echo \$${cpu}_mask)
> +    family=$(eval echo \$${cpu}_family)
> +
> +    if [ "$magic" = "" -o "$mask" = "" -o "$family" = "" ] ; then
> +        echo "INTERNAL ERROR: unknown cpu $cpu" 1>&2
> +        continue
> +    fi
> +
> +    qemu="$QEMU_PATH/qemu-$cpu"
> +    if [ "$cpu" = "i486" ] ; then
> +        qemu="$QEMU_PATH/qemu-i386"
> +    fi
> +
> +    if [ "$host_family" != "$family" ] ; then
> +        echo "Setting $qemu as binfmt interpreter for $cpu"
> +        echo ":$cpu:M::$magic:$mask:$qemu:" > /proc/sys/fs/binfmt_misc/register
> +    fi
> +done
> -- 
> 1.7.10.4
>

Le jeudi 24 janvier 2013 à 19:07 +0100, Alexander Graf a écrit :
> On 20.01.2013, at 00:20, Laurent Vivier wrote:
> 
> > Signed-off-by: Laurent Vivier <laurent@vivier.eu>
[...]
> > index 0da2618..6235637
> > --- a/scripts/qemu-binfmt-conf.sh
> > +++ b/scripts/qemu-binfmt-conf.sh
> > @@ -1,69 +1,59 @@
> > #!/bin/sh
> > # enable automatic i386/ARM/M68K/MIPS/SPARC/PPC/s390 program execution by the kernel
> > 
> > +MAGIC=$(dirname $(readlink -f "$0"))/binfmts-magic
> 
> Wouldn't that break with $0 is in PATH?

Yes, it breaks. But the purpose of this script is not to be installed
but to help Qemu developers to create runnable linux root file system.
If this script is installed, the good way to do this is to use the
install base prefix.

Regards,
Laurent

Am 24.01.2013 um 21:10 schrieb Laurent Vivier <Laurent@vivier.eu>:

> Le jeudi 24 janvier 2013 à 19:07 +0100, Alexander Graf a écrit :
>> On 20.01.2013, at 00:20, Laurent Vivier wrote:
>> 
>>> Signed-off-by: Laurent Vivier <laurent@vivier.eu>
> [...]
>>> index 0da2618..6235637
>>> --- a/scripts/qemu-binfmt-conf.sh
>>> +++ b/scripts/qemu-binfmt-conf.sh
>>> @@ -1,69 +1,59 @@
>>> #!/bin/sh
>>> # enable automatic i386/ARM/M68K/MIPS/SPARC/PPC/s390 program execution by the kernel
>>> 
>>> +MAGIC=$(dirname $(readlink -f "$0"))/binfmts-magic
>> 
>> Wouldn't that break with $0 is in PATH?
> 
> Yes, it breaks. But the purpose of this script is not to be installed
> but to help Qemu developers to create runnable linux root file system.
> If this script is installed, the good way to do this is to use the
> install base prefix.

Well, we could patch $prefix into the script on make install. In openSUSE, we do install this script and having a streamlined approach for that would be good imho.

Alex

> 
> Regards,
> Laurent
> -- 
> "Just play. Have fun. Enjoy the game."
> - Michael Jordan
>