This series adds a new "priv" virtual register that reports the current privilege mode. This is helpful for debugging purposes because that information is not actually available in any of the real CSRs.
The third patch in this series makes the priv virtual register writitable. I'm not entirely sure this is a good idea, so I split it out into its own patch. In particular, this change will conflict with the hypervisor extension work which assumes that the privilege mode does not change in unexpected cases. As pointed out in a previous version of this series, GDB actually contains some support already for the accessing the privilege mode via a virtual "priv" register, including to convert the values into human readable forms: (gdb) info reg priv priv 0x3 prv:3 [Machine] Changlog V4: - Fix typo in filename Changlog V3: - Break patch into series - Make priv a virtual register Changelog V2: - Use PRV_H and PRV_S instead of integer literals Jonathan Behrens (3) target/riscv: Tell gdbstub the correct number of CSRs target/riscv: Expose priv register for GDB for reads target/riscv: Make the priv register writable by GDB configure | 4 ++-- gdb-xml/riscv-32bit-virtual.xml | 11 +++++++++++ gdb-xml/riscv-64bit-virtual.xml | 11 +++++++++++ target/riscv/gdbstub.c | 36 ++++++++++++++++++++++++++++++++++-- 4 files changed, 58 insertions(+), 4 deletions(-)
