[#61174] Add RISCV_PRIV_UNRATIFIED

Author: adrabarek

arch/riscv/arch_exports.c

@@ -146,7 +146,7 @@ EXC_INT_1(uint32_t, tlib_is_feature_allowed, uint32_t, feature_bit)
 
 void tlib_set_privilege_architecture(int32_t privilege_architecture)
 {
-    if (privilege_architecture > RISCV_PRIV1_12) {
+    if (privilege_architecture > RISCV_PRIV1_12 && privilege_architecture != RISCV_PRIV_UNRATIFIED) {
         tlib_abort("Invalid privilege architecture set. Highest supported version is 1.12");
     }
     cpu->privilege_architecture = privilege_architecture;

arch/riscv/cpu.h

@@ -324,6 +324,11 @@ enum privilege_architecture {
     RISCV_PRIV1_10,
     RISCV_PRIV1_11,
     RISCV_PRIV1_12,
+    // For features that are not yet part of ratified privileged architecture,
+    // use RISCV_PRIV_UNRATIFIED.
+    // Replace with an actual version once it becomes a part of ratified spec.
+    // KEEP LAST
+    RISCV_PRIV_UNRATIFIED
 };
 
 // The enum encodes the fmt field of opcode

arch/riscv/op_helper.c

@@ -169,15 +169,16 @@ static target_ulong mtvec_stvec_write_handler(target_ulong val_to_write, char* r
 {
     target_ulong new_value = 0;
 
-    if (((env->privilege_architecture >= RISCV_PRIV1_10 && env->privilege_architecture < RISCV_PRIV1_11) && (val_to_write & 0x2)) ||
+    bool is_before_clic = env->privilege_architecture < RISCV_PRIV_UNRATIFIED;
+    if (((env->privilege_architecture >= RISCV_PRIV1_10 && is_before_clic) && (val_to_write & 0x2)) ||
         (env->privilege_architecture < RISCV_PRIV1_10 && (val_to_write & 0x3))) {
         tlib_printf(LOG_LEVEL_WARNING, "Trying to set unaligned %s: 0x%X, aligning to 4-byte boundary.", register_name, val_to_write);
     }
 
     switch (cpu->interrupt_mode)
     {
         case INTERRUPT_MODE_AUTO:
-            if (env->privilege_architecture >= RISCV_PRIV1_11) {
+            if (env->privilege_architecture >= RISCV_PRIV_UNRATIFIED) {
                 new_value = val_to_write;
             } else if (env->privilege_architecture >= RISCV_PRIV1_10) {
                 new_value = val_to_write & ~0x2;