StarletBootstrapProbe: report StarOS's panic words

StarOS's panic path (ADR-0014 R6) writes no trace line: it sets the guard
word __panic_state, stores __panic_code and halts. LoadBootstrapELF now
returns both symbols when an image has them (optional, but both or
neither, as words of the data segment), and the probe stops a run whose
guard is set: it prints the trace published so far and
"Starlet panic state <n> code <n>", and passes --expect-panic when the
state is 1. Images without these symbols (StarletOS) load and run as
before; a REV:PANIC trace line still satisfies --expect-panic.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

Tools/StarletBootstrapProbe/StarletBootstrapProbe.cpp

@@ -1,6 +1,7 @@
 // Copyright 2026 Dolphin Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
+#include <algorithm>
 #include <cstdlib>
 #include <fstream>
 #include <iostream>
@@ -92,6 +93,22 @@ bool Run(const std::string& path, bool jit, bool mmu_faults, ExpectedOutcome exp
       return expected == ExpectedOutcome::UndefinedFault && fault_code == 1 &&
              memory.Read32(info.fault_lr) != 0 && memory.Read32(info.fault_spsr) != 0;
     }
+    // StarOS's panic path writes no trace line: it sets its guard word, then its code, and halts.
+    // The trace published so far is printed for the scenario's ordered checks.
+    if (info.panic_state != 0 && memory.Read32(info.panic_state) != 0)
+    {
+      const u32 panic_state = memory.Read32(info.panic_state);
+      const u32 panic_code = memory.Read32(info.panic_code);
+      const u32 length = memory.Read32(info.trace) == TRACE_MAGIC ?
+                             std::min(memory.Read32(info.trace + 4), TRACE_CAPACITY) :
+                             0;
+      for (u32 index = 0; index < length; ++index)
+        std::cout << static_cast<char>(memory.Read8(info.trace + 8 + index));
+      std::cout << "PC=0x" << std::hex << core.GetRegister(15) << std::dec
+                << " instructions=" << core.GetExecutedInstructions() << '\n';
+      std::cerr << "Starlet panic state " << panic_state << " code " << panic_code << '\n';
+      return expected == ExpectedOutcome::Panic && panic_state == 1;
+    }
     if (memory.Read32(info.trace) != TRACE_MAGIC)
       continue;
     const u32 length = memory.Read32(info.trace + 4);