Changes on registers names

[racarla]

The RISC-V Instruction Set Manual
Volume II: Privileged Architecture
Document Version 20190608-Priv-MSU-Ratified

mbadaddr : -> mtval?
The mbadaddr register has been subsumed by a more general mtval register that can now
capture bad instruction bits on an illegal instruction fault to speed instruction emulation.
(Preface to Version 1.10 - Page 5)

mbase : ?
mibase : ?
mdbase : ?
mbound : ?
mibound : ?
mdbound : ?

sptbr : -> satp
The supervisor virtual memory configuration has been moved from the mstatus register to
the sptbr register. Accordingly, the sptbr register has been renamed to satp (Supervisor
Address Translation and Protection) to reflect its broadened role.
(Preface to Version 1.10 - Page 5)

sbadaddr : stval?

thanks for reading and for the great work done with the simulator!