G.4.3 MIPS Features
The org.gnu.gdb.mips.cp0 feature is also required. It should contain at least the status, badvaddr, and cause registers. They may be 32-bit or 64-bit depending on the target.
The org.gnu.gdb.mips.fpu feature is currently required, though it may be optional in a future version of gdb. It should contain registers f0 through f31, fcsr, and fir. They may be 32-bit or 64-bit depending on the target.
The org.gnu.gdb.mips.linux feature is optional. It should contain a single register, restart, which is used by the Linux kernel to control restartable syscalls.