fix instruction decode

2021-07-09 07:37:12 +02:00
parent 473f8a5a17
commit e68918c2e8
3 changed files with 78 additions and 100 deletions
--- a/incl/iss/arch/riscv_hart_m_p.h
+++ b/incl/iss/arch/riscv_hart_m_p.h
@ -144,10 +144,10 @@ public:

        mstatus_t mstatus;

-        static const reg_t mstatus_reset_val = 0;
+        static const reg_t mstatus_reset_val = 0x1800;

        void write_mstatus(T val) {
-            auto mask = get_mask();
+            auto mask = get_mask() &0xff; // MPP is hardcode as 0x3
            auto new_val = (mstatus.backing.val & ~mask) | (val & mask);
            mstatus = new_val;
        }