fix: csrs test fixes

Author: henrikg-qc

backends/cpp_hart_gen/cpp/include/udb/bits.hpp

@@ -694,6 +694,10 @@ namespace udb {
       }
     }
 
+    constexpr std::conditional_t<Signed, SignedStorageType, const StorageType &> get_ignore_unknown() const {
+      return m_val;
+    }
+
     constexpr const _Bits& to_defined() const { return *this; }
 
     // cast to other Bits types
@@ -3467,7 +3471,7 @@ struct fmt::formatter<BitsClass<N, Signed>>
     : formatter<typename BitsClass<N, Signed>::StorageType> {
   template <typename CONTEXT_TYPE>
   auto format(BitsClass<N, Signed> value, CONTEXT_TYPE &ctx) const {
-    return fmt::formatter<typename BitsClass<N, Signed>::StorageType>::format(value.get(), ctx);
+    return fmt::formatter<typename BitsClass<N, Signed>::StorageType>::format(value.get_ignore_unknown(), ctx);
   }
 };
 

backends/cpp_hart_gen/templates/csrs.hxx.erb

@@ -254,7 +254,7 @@ namespace udb {
       } else {
         udb_assert(xlen == 64_b, "Bad xlen");
         <%-
-          field_cpp = fields_for_xlen32.map do |field|
+          field_cpp = fields_for_xlen64.map do |field|
             if field.dynamic_location?
               "((m_#{field.name}._hw_read() & 0x#{((1 << field.location(64).size) - 1).to_s(16)}_b).template widening_sll<#{field.location(64).begin}>())"
             else

spec/std/isa/csr/sstatus.yaml

@@ -33,7 +33,7 @@ fields:
   UXL:
     location: 33-32
     base: 64
-    alias: mstatus.MXR
+    alias: mstatus.UXL
     description: |
       *U-mode XLEN*