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Running of 32 bit binaries on X86-64 / IA-64

Hi ,

  I would appreciate if you could me point to a
document or  explain , how 32 bit programs are
recognised and handled in the 64 bit Linux Kernel 
on X86_64 ( Opteron ) or IA_64 ( Itanium ) processors
. 

  How & when is the processor mode switched for the 
32 bit binaries ? Which part in the kernel sources 
deals with this ?

  Also what would be the packages required to run 
the 32 bit programs on these 64 bit architechtures ?

  Kindly reply directly to me as I'am not 
subscribed to this list .

Cheers !  

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