From 40ba8969eab37f3dfbf3a9857668669a071530c4 Mon Sep 17 00:00:00 2001
From: thrust26 <tjentzsch@yahoo.de>
Date: Mon, 3 Jun 2024 13:27:10 +0200
Subject: [PATCH] added option to enable thumb cycle counting via emulated ROM

---
 src/emucore/Thumbulator.cxx | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/emucore/Thumbulator.cxx b/src/emucore/Thumbulator.cxx
index 03bf5ce33..37eaee80b 100644
--- a/src/emucore/Thumbulator.cxx
+++ b/src/emucore/Thumbulator.cxx
@@ -510,7 +510,6 @@ void Thumbulator::write32(uInt32 addr, uInt32 data)
             mamcr = static_cast<MamModeType>(data);
           break;
       #endif
-
         default:
           break;
       }
@@ -760,6 +759,11 @@ uInt32 Thumbulator::read32(uInt32 addr)
         case 0xE000E018:
           data = systick_count;
           return data;
+#ifdef THUMB_CYCLE_COUNT
+        case 0xE01FC100: // APBDIV 
+          _countCycles = true; // enabe cycle counting
+          return 1; // random value 
+#endif
 
 #ifndef UNSAFE_OPTIMIZATIONS
         case 0xE000E01C: