Issue : TSFFS does not recognize HARNESS_START in UEFI Application (Built in SimicsOpenBoardPkg)

[raajkumarselvam70-maker]

Platform: Intel Simics OpenBoardPkg (EDK II)
Target: BoardX58Ich10
Build: DEBUG_GCC5
Harness type: UEFI Application (UEFI_APPLICATION)
UEFI Shell: EDK II Shell v2.2
Agent: SimicsAgent.efi (UEFI v1.5)

I built a UEFI application fuzz harness using SimicsOpenBoardPkg and TSFFS.
The application uses:

HARNESS_START(Input, &InputSize);
  Input[255] = '\0';   // FileName
  Input[519] = '\0';   // Description

  CHAR8  *FileName = (CHAR8 *)(Input + 0);
  UINT64 *LinePtr  = (UINT64 *)(Input + 256);
  CHAR8  *Desc     = (CHAR8 *)(Input + 264);

  DebugAssert(
    FileName,
    LineNumber,
    Desc
  );
HARNESS_STOP();

When running the app, TSFFS prints:

[tsffs info] Adding processor 0 to fuzzer
[tsffs info] Magic instruction 1 was triggered ... but the index is not configured for this magic number
Configured indices are: start: 0, stop: [0], assert: [0]
ASSERT [DebugAssertHarnessApp] (1)

fuzzing never starts here

So I manually configured this in fuzz.simics:

@tsffs.start_on_harness = True
@tsffs.magic_start_index = 3724198552

Even though fuzzing starts, the input buffer is always empty / zeroed
Input is not filled with testcase data