forked from Mirrors/opensbi
2677324f90
On RV32 systems, we have two CSRs for M-mode status (MSTATUS and MSTATUSH) when H-extension is implemented. This means we have to save/restore MSTATUSH for RV32 systems only when H-extension is implemented. The current _trap_handler() has extra instructions (roughly 10) for conditional save/restore of MSTATUSH CSR. These extra instructions in RV32 _trap_handler() can be avoided if we create separate low-level trap handler for RV32 systems having H-extension. This patch optimizes low-level trap handler for RV32 systems accordingly. Signed-off-by: Anup Patel <anup.patel@wdc.com> Reviewed-by: Alistair Francis <alistair.francis@wdc.com>