-- use kernel traps for unaligned accesses on ARM ?
-- handle rare page fault cases (in particular if page fault in heplers or
- in syscall emulation code).
-- fix thread stack freeing (use kernel 2.5.x CLONE_CHILD_CLEARTID)
-- more syscalls (in particular all 64 bit ones, IPCs, fix 64 bit
- issues, fix 16 bit uid issues)
-- use page_unprotect_range in every suitable syscall to handle all
- cases of self modifying code.
-- use gcc as a backend to generate better code (easy to do by using
- op-i386.c operations as local inline functions).
-- add SSE2/MMX operations