Add an rdtsc false positive check for Group S Challenge [CC-005] [1.05]

src/core/kernel/init/CxbxKrnl.cpp

@@ -492,7 +492,7 @@ const uint8_t rdtsc_pattern[] = {
     0xEB,
     0xF6,
     0xA1,
-    0x01
+    0x01                       // one false positive in Group S Challenge [1.05] .text E8 0F 31 01 00
 };
 const int sizeof_rdtsc_pattern = sizeof(rdtsc_pattern);
 
@@ -550,6 +550,15 @@ void PatchRdtscInstructions()
 								continue;
 							}
 
+						}
+						if (next_byte == 0x01)
+						{
+							if (*(uint8_t*)(addr - 1) == 0xE8 && *(uint8_t*)(addr + 3) == 0x00)
+							{
+								EmuLogInit(LOG_LEVEL::INFO, "Skipped false positive: rdtsc pattern  0x%.2X, @ 0x%.8X", next_byte, (DWORD)addr);
+								continue;
+							}
+
 						}
 						PatchRdtsc(addr);
 						//the first for loop already increment addr per loop. we only increment one more time so the addr will point to the byte next to the found rdtsc instruction. this is important since there is at least one case that two rdtsc instructions are next to each other.