shader: complete faulting SRT walker loads as zero reads

src/loader/runtimeLinker.cpp

@@ -14,6 +14,7 @@
 #include "common/threads.h"
 #include "common/virtualMemory.h"
 #include "graphics/host_gpu/pageManager.h"
+#include "graphics/shader/recompiler/ir/passes/SrtWalker.h"
 #include "kernel/fileSystem.h"
 #include "kernel/memory.h"
 #include "kernel/pthread.h"
@@ -672,6 +673,11 @@ static bool KytyExceptionHandler(const Common::HostException::ExceptionInfo& exc
 			Common::DebugCounters::Add(Common::DebugCounters::Counter::GpuFaults);
 			return true;
 		}
+		if (const auto length =
+		        Libs::Graphics::ShaderRecompiler::IR::SrtWalkerLoadLength(info->exception_address)) {
+			Loader::X64InstructionEmulator::SkipLoad(info->native_context, length);
+			return true;
+		}
 	}
 	// Report whatever guest context can be read safely before terminating: which guest thread
 	// faulted, the register file, the faulting code bytes and the top of its stack.

src/loader/x64InstructionEmulator.cpp

@@ -822,4 +822,10 @@ bool TryEmulate(void* native_context) {
 	       TryEmulateCpuExtensions(context);
 }
 
+void SkipLoad(void* native_context, size_t length) {
+	Context context {static_cast<decltype(Context::native)>(native_context)};
+	context.Gpr(0) = 0;
+	context.Advance(length);
+}
+
 } // namespace Loader::X64InstructionEmulator

src/loader/x64InstructionEmulator.h

@@ -1,9 +1,13 @@
 #ifndef KYTY_LOADER_X64_INSTRUCTION_EMULATOR_H_
 #define KYTY_LOADER_X64_INSTRUCTION_EMULATOR_H_
 
+#include <cstddef>
+
 namespace Loader::X64InstructionEmulator {
 
 [[nodiscard]] bool TryEmulate(void* native_context);
+// Completes a faulting load into EAX as a zero read and resumes after it.
+void SkipLoad(void* native_context, size_t length);
 
 } // namespace Loader::X64InstructionEmulator