A64: Add hook_hint_instructions option

src/frontend/A64/translate/impl/system.cpp

@@ -37,22 +37,37 @@ bool TranslatorVisitor::NOP() {
 }
 
 bool TranslatorVisitor::YIELD() {
+    if (!options.hook_hint_instructions) {
+        return true;
+    }
     return RaiseException(Exception::Yield);
 }
 
 bool TranslatorVisitor::WFE() {
+    if (!options.hook_hint_instructions) {
+        return true;
+    }
     return RaiseException(Exception::WaitForEvent);
 }
 
 bool TranslatorVisitor::WFI() {
+    if (!options.hook_hint_instructions) {
+        return true;
+    }
     return RaiseException(Exception::WaitForInterrupt);
 }
 
 bool TranslatorVisitor::SEV() {
+    if (!options.hook_hint_instructions) {
+        return true;
+    }
     return RaiseException(Exception::SendEvent);
 }
 
 bool TranslatorVisitor::SEVL() {
+    if (!options.hook_hint_instructions) {
+        return true;
+    }
     return RaiseException(Exception::SendEventLocal);
 }
 

src/frontend/A64/translate/translate.h

@@ -26,6 +26,11 @@ struct TranslationOptions {
     /// If this is false, the ExceptionRaised IR instruction is emitted.
     /// If this is true, we define some behaviour for some instructions.
     bool define_unpredictable_behaviour = false;
+
+    /// This changes what IR we emit when we translate a hint instruction.
+    /// If this is false, we treat the instruction as a NOP.
+    /// If this is true, we emit an ExceptionRaised instruction.
+    bool hook_hint_instructions = true;
 };
 
 /**