From: Arnd Bergmann <arnd@arndb.de>

The code for sys32_execve/do_execve32 in most of the seven versions was copied
from fs/exec.c but not kept up-to-date.  The new compat_do_execve() function
is based on the mips code and has been resync'ed with do_execve().  IA64
changes are from Arun Sharma.

Tested on x86_64, ia64 and s390