About showing the information of the csr
Description of problem:
cannot print the inforamtion after pulling the newest version of qemu
E.g　info r csr 
only fcsr frm fflags are shown. However , it should print out all the csrs such as mideleg mhartid etc in preivous version
info r mip 
(GDB) Invalid register `mip'
Steps to reproduce:
1.running riscv64-unknown-elf-gdb kernel 
2.target remote to the port i set in the xv6 makefile
3.type info r mip it shows the the probklem i mentioned above. I could use the print CSR in previous version of QEMU.
Additional information: