DBG: add dis.iscallsystem expression function

Author: mrexodia

src/dbg/expressionfunctions.cpp

@@ -103,6 +103,7 @@ void ExpressionFunctions::Init()
     RegisterEasy("dis.brfalse", disbrfalse);
     RegisterEasy("dis.next", disnext);
     RegisterEasy("dis.prev", disprev);
+    RegisterEasy("dis.iscallsystem", disiscallsystem);
 
     //Trace record
     RegisterEasy("tr.enabled", trenabled);

src/dbg/exprfunc.cpp

@@ -284,6 +284,12 @@ namespace Exprfunc
         return readStart + disasmback(disasmData, 0, sizeof(disasmData), addr - readStart, 1);
     }
 
+    duint disiscallsystem(duint addr)
+    {
+        duint dest = disbranchdest(addr);
+        return dest && (modsystem(dest) || modsystem(disbranchdest(dest)));
+    }
+
     duint trenabled(duint addr)
     {
         return TraceRecord.getTraceRecordType(addr) != TraceRecordManager::TraceRecordNone;

src/dbg/exprfunc.h

@@ -47,6 +47,7 @@ namespace Exprfunc
     duint disbrfalse(duint addr);
     duint disnext(duint addr);
     duint disprev(duint addr);
+    duint disiscallsystem(duint addr);
 
     duint trenabled(duint addr);
     duint trhitcount(duint addr);