Fix fu{byte|word*} and su{byte|word*}:

o  If the address was not within user space we jumped to fusufault
   where we would clear pcb_onfault and return 0. There are two
   bugs here:
   1. We never got to the point where we assigned the address of
      pcb_onfault to r15, which means that we would clobber some
      random memory location, including I/O space or ROM.
   2. We're supposed to return -1 on error.
o  Make sure we have proper memory ordering for setting pcb_onfault,
   doing the memory access to user space and clearing pcb_onfault.
   For the fu* family of functions this means that we need a mf
   instruction, because we don't have acquire semantics on stores
   and release semantics on loads (hence st;ld cannot be ordered
   without intermediate mf).

While here, implement casuptr() so that we are a (small) step
closer to supporting libthr and deobfuscate the non-implementation
of {f|s}uswintr.

Approved by: re@ (blanket)

0 files changed, 0 insertions, 0 deletions