GdbServer: Save off some signal information when it occurs

Enough for some state reconstruction that is missing
FEX-Emu · Dec 10, 2024 · 84aa49b · 84aa49b
1 parent 146a5e3
commit 84aa49b
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diff --git a/Source/Tools/LinuxEmulation/LinuxSyscalls/GdbServer.cpp b/Source/Tools/LinuxEmulation/LinuxSyscalls/GdbServer.cpp
@@ -108,6 +108,16 @@ GdbServer::GdbServer(FEXCore::Context::Context* ctx, FEX::HLE::SignalDelegator*
         return false;
       }
 
+      auto ThreadObject = FEX::HLE::ThreadManager::GetStateObjectFromFEXCoreThread(Thread);
+      ThreadObject->GdbInfo.Signal = Signal;
+
+      ThreadObject->GdbInfo.SignalPC = ArchHelpers::Context::GetPc(ucontext);
+      uint32_t IgnoreMask = Thread->CurrentFrame->InSyscallInfo & 0xFFFF;
+      this->SignalDelegation->SpillSRA(Thread, ucontext, IgnoreMask);
+
+      memcpy(ThreadObject->GdbInfo.GPRs, ArchHelpers::Context::GetArmGPRs(ucontext), sizeof(uint64_t) * 32);
+      ThreadObject->GdbInfo.PState = ArchHelpers::Context::GetArmPState(ucontext);
+
       // Let GDB know that we have a signal
       this->Break(Thread, Signal);
 

diff --git a/Source/Tools/LinuxEmulation/LinuxSyscalls/ThreadManager.h b/Source/Tools/LinuxEmulation/LinuxSyscalls/ThreadManager.h
@@ -84,6 +84,14 @@ struct ThreadStateObject : public FEXCore::Allocator::FEXAllocOperators {
   std::atomic_bool ThreadSleeping {false};
   FEXCore::InterruptableConditionVariable ThreadPaused;
 
+  // GDB signal information
+  struct GdbInfoStruct {
+    int Signal {};
+    uint64_t SignalPC {};
+    uint64_t GPRs[32];
+    uint64_t PState {};
+  } GdbInfo;
+
   int StatusCode {};
 };