The sun mmu is very broken, and we all can thank crashme for

helping me find this bug.  On execution of an atomic load/store instruction
the chip will only say that a read fault is happening, we then load up a
readonly translation to the accessed page, and we get the fault again still
showing a read-fault.  We end up faulting in a loop forever and the process
appears to be completely stuck.  The algorithm to fix this problem goes like
this.  If we get a non-text fault, and the fault type is VM_PROT_READ, and
the SER_PROT bit is set in the syncronous fault error register, we take
a peek at the instruction at pc.  If this instruction is indeed an ldstub
or a swap variant we or in VM_PROT_WRITE to the fault type.

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