Testing instruction set

We put this script together today in #gentoo-alpha, we needed a way to
find out what instruction set a binary was compiled for to track down a
bug, and this script helped. 

I think its really cool, so i thought id share it with you guys :)

example output:

$ ./analyse /usr/bin/less
bwx:  663  mvi:    0  fix:   0  cix:    0
/usr/bin/less will run on ev56 and newer.

#!/bin/sh
# Tavis Ormandy <[email protected]> 2003
# Improvements by Will Woods <[email protected]>
#
# Guess what alpha revision a binary was compiled for 
# using objdump.
#

eval {bwx,fix,cix,mvi}=0
objdump -d $1 | cut -f3 | (
while read instruction; do
 print=""
 case "$instruction" in
  "ldbu"|"ldwu"|"sextb"|"sextw"|"stb"|"stw") let ++bwx; print=1 ;;
  "maxsb8"|"maxsw4"|"maxub8"|"maxuw4"|"minsb8"|"minsw4"|"minub8"|"minuw4"|"perr"|"pklb"|"pkwb"|"unpkbl"|"unpkbw") let ++mvi; print=1;;
  "ftois"|"ftoit"|"itoff"|"itofs"|"itoft"|"sqrtf"|"sqrtg"|"sqrts"|"sqrtt") let ++fix; print=1;;
  "ctlz"|"ctpop"|"cttz") let ++cix; print=1;;
 esac
 if [ -n "$print" ] ; then
  printf "bwx: %4u  mvi: %4u  fix:%4u  cix: %4u\r" $bwx $mvi $fix $cix
 fi
done 

echo
if   [ $cix -gt 0 ]; then subarch="ev67" ; 
elif [ $fix -gt 0 ]; then subarch="ev6" ; 
elif [ $mvi -gt 0 ]; then subarch="pca56" ; 
elif [ $bwx -gt 0 ]; then subarch="ev56" ; 
fi
if [ -z "$subarch" ]; then 
 echo "$1 will run on any alpha."
else 
 echo "$1 will run on $subarch and newer."
fi
)

-- 
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[email protected] | finger me for my gpg key.
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