SignalDelegator: Let the frontend inform AVX support

Since the frontend has changed to informing the backend if AVX is supported, there is no reason to feed that configuration back in to SignalDelegator from the backend. Instead inform the SignalDelegator directly in the frontend instead of this now weird round-about path.
FEX-Emu · Sep 22, 2024 · 741446b · 741446b
1 parent c0b8a0d
commit 741446b
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Showing 6 changed files with 29 additions and 39 deletions.
diff --git a/FEXCore/Source/Interface/Core/Core.cpp b/FEXCore/Source/Interface/Core/Core.cpp
@@ -321,8 +321,6 @@ bool ContextImpl::InitCore() {
 
   // Set up the SignalDelegator config since core is initialized.
   FEXCore::SignalDelegator::SignalDelegatorConfig SignalConfig {
-    .SupportsAVX = HostFeatures.SupportsAVX,
-
     .DispatcherBegin = Dispatcher->Start,
     .DispatcherEnd = Dispatcher->End,
 

diff --git a/FEXCore/include/FEXCore/Core/SignalDelegator.h b/FEXCore/include/FEXCore/Core/SignalDelegator.h
@@ -40,8 +40,6 @@ class SignalDelegator {
   virtual ~SignalDelegator() = default;
 
   struct SignalDelegatorConfig {
-    bool SupportsAVX {};
-
     // Dispatcher information
     uint64_t DispatcherBegin;
     uint64_t DispatcherEnd;

diff --git a/Source/Tools/FEXLoader/FEXLoader.cpp b/Source/Tools/FEXLoader/FEXLoader.cpp
@@ -498,16 +498,18 @@ int main(int argc, char** argv, char** const envp) {
   // System allocator is now system allocator or FEX
   FEXCore::Context::InitializeStaticTables(Loader.Is64BitMode() ? FEXCore::Context::MODE_64BIT : FEXCore::Context::MODE_32BIT);
 
+  bool SupportsAVX {};
   fextl::unique_ptr<FEXCore::Context::Context> CTX;
   {
     auto HostFeatures = FEX::FetchHostFeatures();
     CTX = FEXCore::Context::Context::CreateNewContext(HostFeatures);
+    SupportsAVX = HostFeatures.SupportsAVX;
   }
 
   // Setup TSO hardware emulation immediately after initializing the context.
   FEX::TSO::SetupTSOEmulation(CTX.get());
 
-  auto SignalDelegation = FEX::HLE::CreateSignalDelegator(CTX.get(), Program.ProgramName);
+  auto SignalDelegation = FEX::HLE::CreateSignalDelegator(CTX.get(), Program.ProgramName, SupportsAVX);
 
   auto SyscallHandler = Loader.Is64BitMode() ? FEX::HLE::x64::CreateHandler(CTX.get(), SignalDelegation.get()) :
                                                FEX::HLE::x32::CreateHandler(CTX.get(), SignalDelegation.get(), std::move(Allocator));

diff --git a/Source/Tools/LinuxEmulation/LinuxSyscalls/SignalDelegator.cpp b/Source/Tools/LinuxEmulation/LinuxSyscalls/SignalDelegator.cpp
@@ -118,7 +118,7 @@ void SignalDelegator::SpillSRA(FEXCore::Core::InternalThreadState* Thread, void*
     Thread->CurrentFrame->State.gregs[i] = ArchHelpers::Context::GetArmReg(ucontext, SRAIdxMap);
   }
 
-  if (Config.SupportsAVX) {
+  if (SupportsAVX) {
     // TODO: This doesn't save the upper 128-bits of the 256-bit registers.
     // This needs to be implemented still.
     for (size_t i = 0; i < Config.SRAFPRCount; i++) {
@@ -178,8 +178,6 @@ ArchHelpers::Context::ContextBackup* SignalDelegator::StoreThreadState(FEXCore::
 }
 
 void SignalDelegator::RestoreThreadState(FEXCore::Core::InternalThreadState* Thread, void* ucontext, RestoreType Type) {
-  const bool IsAVXEnabled = Config.SupportsAVX;
-
   uint64_t OldSP {};
   if (Type == RestoreType::TYPE_PAUSE) [[unlikely]] {
     OldSP = ArchHelpers::Context::GetSp(ucontext);
@@ -203,7 +201,7 @@ void SignalDelegator::RestoreThreadState(FEXCore::Core::InternalThreadState* Thr
       GuestSP += sizeof(siginfo_t);
       GuestSP = FEXCore::AlignUp(GuestSP, alignof(siginfo_t));
 
-      if (IsAVXEnabled) {
+      if (SupportsAVX) {
         GuestSP += sizeof(FEXCore::x86_64::xstate);
         GuestSP = FEXCore::AlignUp(GuestSP, alignof(FEXCore::x86_64::xstate));
       } else {
@@ -221,7 +219,7 @@ void SignalDelegator::RestoreThreadState(FEXCore::Core::InternalThreadState* Thr
         GuestSP += sizeof(SigFrame_i32) - 8;
         GuestSP = FEXCore::AlignUp(GuestSP, alignof(SigFrame_i32));
 
-        if (IsAVXEnabled) {
+        if (SupportsAVX) {
           GuestSP += sizeof(FEXCore::x86::xstate);
           GuestSP = FEXCore::AlignUp(GuestSP, alignof(FEXCore::x86::xstate));
         } else {
@@ -238,7 +236,7 @@ void SignalDelegator::RestoreThreadState(FEXCore::Core::InternalThreadState* Thr
         GuestSP += sizeof(RTSigFrame_i32) - 4;
         GuestSP = FEXCore::AlignUp(GuestSP, alignof(RTSigFrame_i32));
 
-        if (IsAVXEnabled) {
+        if (SupportsAVX) {
           GuestSP += sizeof(FEXCore::x86::xstate);
           GuestSP = FEXCore::AlignUp(GuestSP, alignof(FEXCore::x86::xstate));
         } else {
@@ -833,9 +831,10 @@ void SignalDelegator::QueueSignal(pid_t tgid, pid_t tid, int Signal, siginfo_t*
   }
 }
 
-SignalDelegator::SignalDelegator(FEXCore::Context::Context* _CTX, const std::string_view ApplicationName)
+SignalDelegator::SignalDelegator(FEXCore::Context::Context* _CTX, const std::string_view ApplicationName, bool SupportsAVX)
   : CTX {_CTX}
-  , ApplicationName {ApplicationName} {
+  , ApplicationName {ApplicationName}
+  , SupportsAVX {SupportsAVX} {
   // Signal zero isn't real
   HostHandlers[0].Installed = true;
 
@@ -1295,7 +1294,8 @@ uint64_t SignalDelegator::GuestSignalFD(int fd, const uint64_t* set, size_t sigs
   return Result == -1 ? -errno : Result;
 }
 
-fextl::unique_ptr<FEX::HLE::SignalDelegator> CreateSignalDelegator(FEXCore::Context::Context* CTX, const std::string_view ApplicationName) {
-  return fextl::make_unique<FEX::HLE::SignalDelegator>(CTX, ApplicationName);
+fextl::unique_ptr<FEX::HLE::SignalDelegator>
+CreateSignalDelegator(FEXCore::Context::Context* CTX, const std::string_view ApplicationName, bool SupportsAVX) {
+  return fextl::make_unique<FEX::HLE::SignalDelegator>(CTX, ApplicationName, SupportsAVX);
 }
 } // namespace FEX::HLE
diff --git a/Source/Tools/LinuxEmulation/LinuxSyscalls/SignalDelegator.h b/Source/Tools/LinuxEmulation/LinuxSyscalls/SignalDelegator.h
@@ -50,7 +50,7 @@ class SignalDelegator final : public FEXCore::SignalDelegator, public FEXCore::A
 
   // Returns true if the host handled the signal
   // Arguments are the same as sigaction handler
-  SignalDelegator(FEXCore::Context::Context* _CTX, const std::string_view ApplicationName);
+  SignalDelegator(FEXCore::Context::Context* _CTX, const std::string_view ApplicationName, bool SupportsAVX);
   ~SignalDelegator() override;
 
   // Called from the signal trampoline function.
@@ -274,7 +274,9 @@ class SignalDelegator final : public FEXCore::SignalDelegator, public FEXCore::A
 
   std::mutex HostDelegatorMutex;
   std::mutex GuestDelegatorMutex;
+  bool SupportsAVX;
 };
 
-fextl::unique_ptr<FEX::HLE::SignalDelegator> CreateSignalDelegator(FEXCore::Context::Context* CTX, const std::string_view ApplicationName);
+fextl::unique_ptr<FEX::HLE::SignalDelegator>
+CreateSignalDelegator(FEXCore::Context::Context* CTX, const std::string_view ApplicationName, bool SupportsAVX);
 } // namespace FEX::HLE
diff --git a/Source/Tools/LinuxEmulation/LinuxSyscalls/SignalDelegator/GuestFramesManagement.cpp b/Source/Tools/LinuxEmulation/LinuxSyscalls/SignalDelegator/GuestFramesManagement.cpp
@@ -110,8 +110,6 @@ static void SetXStateInfo(T* xstate, bool is_avx_enabled) {
 
 void SignalDelegator::RestoreFrame_x64(FEXCore::Core::InternalThreadState* Thread, ArchHelpers::Context::ContextBackup* Context,
                                        FEXCore::Core::CpuStateFrame* Frame, void* ucontext) {
-  const bool IsAVXEnabled = Config.SupportsAVX;
-
   auto* guest_uctx = reinterpret_cast<FEXCore::x86_64::ucontext_t*>(Context->UContextLocation);
   [[maybe_unused]] auto* guest_siginfo = reinterpret_cast<siginfo_t*>(Context->SigInfoLocation);
 
@@ -155,7 +153,7 @@ void SignalDelegator::RestoreFrame_x64(FEXCore::Core::InternalThreadState* Threa
     // Copy float registers
     memcpy(Frame->State.mm, fpstate->_st, sizeof(Frame->State.mm));
 
-    if (IsAVXEnabled) {
+    if (SupportsAVX) {
       CTX->SetXMMRegistersFromState(Thread, fpstate->_xmm, xstate->ymmh.ymmh_space);
     } else {
       CTX->SetXMMRegistersFromState(Thread, fpstate->_xmm, nullptr);
@@ -176,8 +174,6 @@ void SignalDelegator::RestoreFrame_x64(FEXCore::Core::InternalThreadState* Threa
 
 void SignalDelegator::RestoreFrame_ia32(FEXCore::Core::InternalThreadState* Thread, ArchHelpers::Context::ContextBackup* Context,
                                         FEXCore::Core::CpuStateFrame* Frame, void* ucontext) {
-  const bool IsAVXEnabled = Config.SupportsAVX;
-
   SigFrame_i32* guest_uctx = reinterpret_cast<SigFrame_i32*>(Context->UContextLocation);
   // If the guest modified the RIP then we need to take special precautions here
   if (Context->OriginalRIP != guest_uctx->sc.ip || Context->FaultToTopAndGeneratedException) {
@@ -228,7 +224,7 @@ void SignalDelegator::RestoreFrame_ia32(FEXCore::Core::InternalThreadState* Thre
     }
 
     // Extended XMM state
-    if (IsAVXEnabled) {
+    if (SupportsAVX) {
       CTX->SetXMMRegistersFromState(Thread, fpstate->_xmm, xstate->ymmh.ymmh_space);
     } else {
       CTX->SetXMMRegistersFromState(Thread, fpstate->_xmm, nullptr);
@@ -249,8 +245,6 @@ void SignalDelegator::RestoreFrame_ia32(FEXCore::Core::InternalThreadState* Thre
 
 void SignalDelegator::RestoreRTFrame_ia32(FEXCore::Core::InternalThreadState* Thread, ArchHelpers::Context::ContextBackup* Context,
                                           FEXCore::Core::CpuStateFrame* Frame, void* ucontext) {
-  const bool IsAVXEnabled = Config.SupportsAVX;
-
   RTSigFrame_i32* guest_uctx = reinterpret_cast<RTSigFrame_i32*>(Context->UContextLocation);
   // If the guest modified the RIP then we need to take special precautions here
   if (Context->OriginalRIP != guest_uctx->uc.uc_mcontext.gregs[FEXCore::x86::FEX_REG_EIP] || Context->FaultToTopAndGeneratedException) {
@@ -302,7 +296,7 @@ void SignalDelegator::RestoreRTFrame_ia32(FEXCore::Core::InternalThreadState* Th
     }
 
     // Extended XMM state
-    if (IsAVXEnabled) {
+    if (SupportsAVX) {
       CTX->SetXMMRegistersFromState(Thread, fpstate->_xmm, xstate->ymmh.ymmh_space);
     } else {
       CTX->SetXMMRegistersFromState(Thread, fpstate->_xmm, nullptr);
@@ -329,8 +323,6 @@ uint64_t SignalDelegator::SetupFrame_x64(FEXCore::Core::InternalThreadState* Thr
   // 32-bit doesn't have a redzone
   NewGuestSP -= 128;
 
-  const bool IsAVXEnabled = Config.SupportsAVX;
-
   // On 64-bit the kernel sets up the siginfo_t and ucontext_t regardless of SA_SIGINFO set.
   // This allows the application to /always/ get the siginfo and ucontext even if it didn't set this flag.
   //
@@ -345,7 +337,7 @@ uint64_t SignalDelegator::SetupFrame_x64(FEXCore::Core::InternalThreadState* Thr
 
   uint64_t HostStackLocation = NewGuestSP;
 
-  if (IsAVXEnabled) {
+  if (SupportsAVX) {
     NewGuestSP -= sizeof(FEXCore::x86_64::xstate);
     NewGuestSP = FEXCore::AlignDown(NewGuestSP, alignof(FEXCore::x86_64::xstate));
   } else {
@@ -378,7 +370,7 @@ uint64_t SignalDelegator::SetupFrame_x64(FEXCore::Core::InternalThreadState* Thr
   // Pointer to where the fpreg memory is
   guest_uctx->uc_mcontext.fpregs = reinterpret_cast<FEXCore::x86_64::_libc_fpstate*>(FPStateLocation);
   auto* xstate = reinterpret_cast<FEXCore::x86_64::xstate*>(FPStateLocation);
-  SetXStateInfo(xstate, IsAVXEnabled);
+  SetXStateInfo(xstate, SupportsAVX);
 
   guest_uctx->uc_mcontext.gregs[FEXCore::x86_64::FEX_REG_RIP] = ContextBackup->OriginalRIP;
   guest_uctx->uc_mcontext.gregs[FEXCore::x86_64::FEX_REG_EFL] = eflags;
@@ -427,7 +419,7 @@ uint64_t SignalDelegator::SetupFrame_x64(FEXCore::Core::InternalThreadState* Thr
   // Copy float registers
   memcpy(fpstate->_st, Frame->State.mm, sizeof(Frame->State.mm));
 
-  if (IsAVXEnabled) {
+  if (SupportsAVX) {
     CTX->ReconstructXMMRegisters(Thread, fpstate->_xmm, xstate->ymmh.ymmh_space);
   } else {
     CTX->ReconstructXMMRegisters(Thread, fpstate->_xmm, nullptr);
@@ -472,15 +464,14 @@ uint64_t SignalDelegator::SetupFrame_ia32(FEXCore::Core::InternalThreadState* Th
                                           FEXCore::Core::CpuStateFrame* Frame, int Signal, siginfo_t* HostSigInfo, void* ucontext,
                                           GuestSigAction* GuestAction, stack_t* GuestStack, uint64_t NewGuestSP, const uint32_t eflags) {
 
-  const bool IsAVXEnabled = Config.SupportsAVX;
   const uint64_t SignalReturn = reinterpret_cast<uint64_t>(VDSOPointers.VDSO_kernel_sigreturn);
 
   NewGuestSP -= sizeof(uint64_t);
   NewGuestSP = FEXCore::AlignDown(NewGuestSP, alignof(uint64_t));
 
   uint64_t HostStackLocation = NewGuestSP;
 
-  if (IsAVXEnabled) {
+  if (SupportsAVX) {
     NewGuestSP -= sizeof(FEXCore::x86::xstate);
     NewGuestSP = FEXCore::AlignDown(NewGuestSP, alignof(FEXCore::x86::xstate));
   } else {
@@ -505,7 +496,7 @@ uint64_t SignalDelegator::SetupFrame_ia32(FEXCore::Core::InternalThreadState* Th
   // Pointer to where the fpreg memory is
   guest_uctx->sc.fpstate = static_cast<uint32_t>(FPStateLocation);
   auto* xstate = reinterpret_cast<FEXCore::x86::xstate*>(FPStateLocation);
-  SetXStateInfo(xstate, IsAVXEnabled);
+  SetXStateInfo(xstate, SupportsAVX);
 
   guest_uctx->sc.cs = Frame->State.cs_idx;
   guest_uctx->sc.ds = Frame->State.ds_idx;
@@ -549,7 +540,7 @@ uint64_t SignalDelegator::SetupFrame_ia32(FEXCore::Core::InternalThreadState* Th
   // Extended XMM state
   fpstate->status = FEXCore::x86::fpstate_magic::MAGIC_XFPSTATE;
 
-  if (IsAVXEnabled) {
+  if (SupportsAVX) {
     CTX->ReconstructXMMRegisters(Thread, fpstate->_xmm, xstate->ymmh.ymmh_space);
   } else {
     CTX->ReconstructXMMRegisters(Thread, fpstate->_xmm, nullptr);
@@ -601,15 +592,14 @@ uint64_t SignalDelegator::SetupRTFrame_ia32(FEXCore::Core::InternalThreadState*
                                             FEXCore::Core::CpuStateFrame* Frame, int Signal, siginfo_t* HostSigInfo, void* ucontext,
                                             GuestSigAction* GuestAction, stack_t* GuestStack, uint64_t NewGuestSP, const uint32_t eflags) {
 
-  const bool IsAVXEnabled = Config.SupportsAVX;
   const uint64_t SignalReturn = reinterpret_cast<uint64_t>(VDSOPointers.VDSO_kernel_rt_sigreturn);
 
   NewGuestSP -= sizeof(uint64_t);
   NewGuestSP = FEXCore::AlignDown(NewGuestSP, alignof(uint64_t));
 
   uint64_t HostStackLocation = NewGuestSP;
 
-  if (IsAVXEnabled) {
+  if (SupportsAVX) {
     NewGuestSP -= sizeof(FEXCore::x86::xstate);
     NewGuestSP = FEXCore::AlignDown(NewGuestSP, alignof(FEXCore::x86::xstate));
   } else {
@@ -638,7 +628,7 @@ uint64_t SignalDelegator::SetupRTFrame_ia32(FEXCore::Core::InternalThreadState*
   // Pointer to where the fpreg memory is
   guest_uctx->uc.uc_mcontext.fpregs = static_cast<uint32_t>(FPStateLocation);
   auto* xstate = reinterpret_cast<FEXCore::x86::xstate*>(FPStateLocation);
-  SetXStateInfo(xstate, IsAVXEnabled);
+  SetXStateInfo(xstate, SupportsAVX);
 
   guest_uctx->uc.uc_mcontext.gregs[FEXCore::x86::FEX_REG_CS] = Frame->State.cs_idx;
   guest_uctx->uc.uc_mcontext.gregs[FEXCore::x86::FEX_REG_DS] = Frame->State.ds_idx;
@@ -684,7 +674,7 @@ uint64_t SignalDelegator::SetupRTFrame_ia32(FEXCore::Core::InternalThreadState*
   // Extended XMM state
   fpstate->status = FEXCore::x86::fpstate_magic::MAGIC_XFPSTATE;
 
-  if (IsAVXEnabled) {
+  if (SupportsAVX) {
     CTX->ReconstructXMMRegisters(Thread, fpstate->_xmm, xstate->ymmh.ymmh_space);
   } else {
     CTX->ReconstructXMMRegisters(Thread, fpstate->_xmm, nullptr);