fixed smcdeleg to be limited to, holds a value in the range 0x40-0x5F, from priv AIA section 9.1

riscv/csrs.cc

@@ -1864,6 +1864,8 @@ void sscsrind_reg_csr_t::verify_permissions(insn_t insn, bool write) const {
     csr_t::verify_permissions(insn, write);
 
   if (proc->extension_enabled(EXT_SMCDELEG)) {
+    auto iselect_val = iselect->read();
+    if (iselect_val >= SISELECT_SMCDELEG_START && iselect_val <= SISELECT_SMCDELEG_END) {
       if (address >= CSR_VSIREG && address <= CSR_VSIREG6) {
         if (!state->v) {
           // An attempt to access any vsireg* from M or S mode raises an illegal instruction exception.
@@ -1916,6 +1918,7 @@ void sscsrind_reg_csr_t::verify_permissions(insn_t insn, bool write) const {
         }
       }
     }
+  }
 
   csr_t_p proxy_csr = get_reg();
   if (proxy_csr == nullptr) {