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From: Paul Brook <paul@codesourcery.com>
Subject: Re: [Qemu-devel] qemu capabilities
Date: Thu, 24 Feb 2005 23:42:37 +0000
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To: qemu-devel@nongnu.org, mwaite@redhat.com

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On Thursday 24 February 2005 21:20, Michael Waite wrote:
> I am wondering if anyone has tried using qemu in a way such that it
> simulates another computer architecture such as:
>
> Set up an x86 host system and configure qemu to simulate a POWER
> platform. The purpose would be to build application binaries for a
> variety of platforms without having to physically have them. This would
> also provide a testing environment such that an ISV could not only build
> their packages but test and certify them as well.

I have done this emulating arm on x86. Setup binfmt_misc with the appropriate 
magic, and it mostly just works. I've attached the setup script I use.

I also gave ppc a quick try, but didn't get very far as the debian installer 
didn't work.

Paul

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Content-Type: application/x-shellscript;
  name="binfmt_misc"
Content-Transfer-Encoding: 7bit
Content-Disposition: attachment;
	filename="binfmt_misc"

#! /bin/sh
# Setup binfmt_misc

PROCDIR="/proc/sys/fs/binfmt_misc"

FORMATS="ARM ARMS PPC PPCS"

#ARM_SIM="/home/paul/arm/bin/arm-none-elf-run"
ARM_SIM="/bin/qemu-arm-static"
ARM_MAGIC='\x7f\x45\x4c\x46\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x28\x00'
ARM_MMASK='\xff\xff\xff\xff\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xff\xff\xff\xff'
# Also do the same for shared libraries
ARMS_SIM="$ARM_SIM"
ARMS_MAGIC='\x7f\x45\x4c\x46\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x03\x00\x28\x00'
ARMS_MMASK='\xff\xff\xff\xff\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xff\xff\xff\xff'

PPC_SIM="/bin/qemu-ppc-static"
PPC_MAGIC='\x7f\x45\x4c\x46\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x14'
PPC_MMASK='\xff\xff\xff\xff\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xff\xff\xff\xff'
PPCS_SIM="$ARM_SIM"
PPCS_MAGIC='\x7f\x45\x4c\x46\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\\x00x03\x00\x14'
PPCS_MMASK='\xff\xff\xff\xff\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xff\xff\xff\xff'

start_binfmt ()
{
  for f in $FORMATS; do
    eval echo ":${f}:M::\$${f}_MAGIC:\$${f}_MMASK:\$${f}_SIM:" \
      > ${PROCDIR}/register
  done
}

stop_binfmt ()
{
  echo "-1" > ${PROCDIR}/status
}

# Abort is the filesystem is not mounted
[ -f $REGFILE ] || exit 0

case "$1" in
  start)
    start_binfmt
    ;;

  stop)
    stop_binfmt
    ;;

  restart)
    stop_binfmt
    start_binfmt
    ;;

  *)
    echo "Usage: /etc/init.d/binfmt_misc {start|stop|restart}"
    exit 1
    ;;
esac


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