diff --git a/orbis-kernel/src/umtx.cpp b/orbis-kernel/src/umtx.cpp
index 383afbd..624b653 100644
--- a/orbis-kernel/src/umtx.cpp
+++ b/orbis-kernel/src/umtx.cpp
@@ -448,7 +448,7 @@ orbis::ErrorCode orbis::umtx_wake_umutex(Thread *thread, ptr<umutex> m) {
 
 orbis::ErrorCode orbis::umtx_sem_wait(Thread *thread, ptr<usem> sem,
                                       std::uint64_t ut) {
-  ORBIS_LOG_WARNING(__FUNCTION__, sem, ut);
+  ORBIS_LOG_TRACE(__FUNCTION__, sem, ut);
   auto [chain, key, lock] = g_context.getUmtxChain0(thread, sem->flags, sem);
   auto node = chain.enqueue(key, thread);
 
diff --git a/rpcsx-os/CMakeLists.txt b/rpcsx-os/CMakeLists.txt
index 6ea82e5..977e1f1 100644
--- a/rpcsx-os/CMakeLists.txt
+++ b/rpcsx-os/CMakeLists.txt
@@ -2,7 +2,8 @@ add_library(standalone-config INTERFACE)
 target_include_directories(standalone-config INTERFACE orbis-kernel-config)
 add_library(orbis::kernel::config ALIAS standalone-config)
 
-add_executable(rpcsx-os 
+add_executable(rpcsx-os
+  iodev/ajm.cpp
   iodev/dce.cpp
   iodev/dipsw.cpp
   iodev/dmem.cpp
diff --git a/rpcsx-os/io-devices.hpp b/rpcsx-os/io-devices.hpp
index 3109c2b..92621df 100644
--- a/rpcsx-os/io-devices.hpp
+++ b/rpcsx-os/io-devices.hpp
@@ -17,3 +17,4 @@ IoDevice *createStdinCharacterDevice();
 IoDevice *createStdoutCharacterDevice();
 IoDevice *createZeroCharacterDevice();
 IoDevice *createRngCharacterDevice();
+IoDevice *createAjmCharacterDevice();
diff --git a/rpcsx-os/iodev/ajm.cpp b/rpcsx-os/iodev/ajm.cpp
new file mode 100644
index 0000000..3e4f895
--- /dev/null
+++ b/rpcsx-os/iodev/ajm.cpp
@@ -0,0 +1,33 @@
+#include "io-device.hpp"
+#include "orbis/KernelAllocator.hpp"
+#include "orbis/utils/Logs.hpp"
+#include <cstdio>
+
+struct AjmDevice : public IoDevice {};
+
+struct AjmInstance : public IoDeviceInstance {};
+
+static std::int64_t ajm_instance_ioctl(IoDeviceInstance *instance,
+                                       std::uint64_t request, void *argp) {
+
+  ORBIS_LOG_FATAL("Unhandled AJM ioctl", request);
+  return -1;
+}
+
+static std::int32_t ajm_device_open(IoDevice *device,
+                                    orbis::Ref<IoDeviceInstance> *instance,
+                                    const char *path, std::uint32_t flags,
+                                    std::uint32_t mode) {
+  auto *newInstance = orbis::knew<AjmInstance>();
+  newInstance->ioctl = ajm_instance_ioctl;
+
+  io_device_instance_init(device, newInstance);
+  *instance = newInstance;
+  return 0;
+}
+
+IoDevice *createAjmCharacterDevice() {
+  auto *newDevice = orbis::knew<AjmDevice>();
+  newDevice->open = ajm_device_open;
+  return newDevice;
+}
\ No newline at end of file
diff --git a/rpcsx-os/main.cpp b/rpcsx-os/main.cpp
index ce91e8c..791509a 100644
--- a/rpcsx-os/main.cpp
+++ b/rpcsx-os/main.cpp
@@ -267,6 +267,7 @@ static int ps4Exec(orbis::Process *mainProcess,
   rx::vfs::mount("/dev/hid", createHidCharacterDevice());
   rx::vfs::mount("/dev/gc", createGcCharacterDevice());
   rx::vfs::mount("/dev/rng", createRngCharacterDevice());
+  rx::vfs::mount("/dev/ajm", createAjmCharacterDevice());
 
   rx::procOpsTable.open(mainThread, "/dev/stdin", 0, 0);
   rx::procOpsTable.open(mainThread, "/dev/stdout", 0, 0);
diff --git a/rpcsx-os/ops.cpp b/rpcsx-os/ops.cpp
index dd2f24d..1c9c1e7 100644
--- a/rpcsx-os/ops.cpp
+++ b/rpcsx-os/ops.cpp
@@ -230,6 +230,7 @@ orbis::SysResult open(orbis::Thread *thread, orbis::ptr<const char> path,
   auto result = rx::vfs::open(path, flags, mode, &instance);
   if (result.isError()) {
     ORBIS_LOG_WARNING("Failed to open file", path, result.value());
+    thread->where();
     return result;
   }
 
@@ -404,6 +405,7 @@ orbis::SysResult ioctl(orbis::Thread *thread, orbis::sint fd, orbis::ulong com,
 
   if (result < 0) {
     // TODO
+    thread->where();
     return ErrorCode::IO;
   }