diff --git a/README.md b/README.md
index 1fedd1b4d..f5cdfc87e 100644
--- a/README.md
+++ b/README.md
@@ -12,7 +12,7 @@ Execution reaches `_start`, stack unwinding and exception handling tables are bu
 Shader initialization via `sceAgcCreate*` passes.
 Audio output and video output initialization pass
 
-Now: `sceKernelCreateSema not implemented`.
+Now: `fopen: open failed: "C:\app0\~INDEX": No such file or directory`.
 
 On Windows, after printing an unhandled exception the process exits with STATUS_STACK_BUFFER_OVERRUN due to the difficulty of manually [implementing proper exception handling](core/libs/prx/libc/src/exception).
 
diff --git a/core/libs/prx/libkernel/Export.cpp b/core/libs/prx/libkernel/Export.cpp
index 37f8ad266..baf0bb71f 100644
--- a/core/libs/prx/libkernel/Export.cpp
+++ b/core/libs/prx/libkernel/Export.cpp
@@ -5,8 +5,8 @@
 #include "prx/libc/include/General.hpp"
 #include "DirectMemory/DirectMemory.hpp"
 #include "Equeue/Equeue.hpp"
-#include "File/include/File.hpp"
-#include "Semaphore/include/Semaphore.hpp"
+#include "prx/libkernel/File/include/File.hpp"
+#include "prx/libkernel/Semaphore/include/Semaphore.hpp"
 
 extern "C" {
 
diff --git a/core/libs/prx/libkernel/File/include/File.hpp b/core/libs/prx/libkernel/File/include/File.hpp
index d5772ff06..d889b6cae 100644
--- a/core/libs/prx/libkernel/File/include/File.hpp
+++ b/core/libs/prx/libkernel/File/include/File.hpp
@@ -5,7 +5,7 @@
 #include <cstddef>
 
 #include "SceTypes.hpp"
-#include "prx/libc/include/general/VabiMacros.hpp"
+#include "prx/libc/include/General.hpp"
 
 extern "C" {
 
@@ -20,3 +20,4 @@ int64_t APS5_VABI sceKernelWrite(int d, const void* buf, size_t nbytes);
 }
 
 #endif
+
diff --git a/core/libs/prx/libkernel/File/src/File.cpp b/core/libs/prx/libkernel/File/src/File.cpp
index c8dc4be8b..2593f2187 100644
--- a/core/libs/prx/libkernel/File/src/File.cpp
+++ b/core/libs/prx/libkernel/File/src/File.cpp
@@ -1,51 +1,62 @@
 #include "prx/libkernel/File/include/File.hpp"
 
 #include <stdexcept>
+#include <string>
 
 extern "C" {
 
 int APS5_VABI sceKernelClose(int d) {
  (void)d;
- throw std::runtime_error("sceKernelClose is not implemented");
+ throw std::runtime_error(std::string(__func__) + " is not implemented");
 }
 
 int APS5_VABI sceKernelLseek(int d, int64_t offset, int whence) {
  (void)d;
  (void)offset;
  (void)whence;
- throw std::runtime_error("sceKernelLseek is not implemented");
+
+ NotImplemented_nid_no_patch(__func__);
+ return 0;
 }
 
 int APS5_VABI sceKernelOpen(const char* path, int flags, uint16_t mode) {
  (void)path;
  (void)flags;
  (void)mode;
- throw std::runtime_error("sceKernelOpen is not implemented");
+
+ NotImplemented_nid_no_patch(__func__);
+ return 0;
 }
 
 int64_t APS5_VABI sceKernelRead(int d, void* buf, size_t nbytes) {
  (void)d;
  (void)buf;
  (void)nbytes;
- throw std::runtime_error("sceKernelRead is not implemented");
+
+ NotImplemented_nid_no_patch(__func__);
+ return 0;
 }
 
 int APS5_VABI sceKernelStat(const char* path, FileStat* sb) {
  (void)path;
  (void)sb;
- throw std::runtime_error("sceKernelStat is not implemented");
+ NotImplemented_nid_no_patch(__func__);
+ return 0;
 }
 
 int APS5_VABI sceKernelUnlink(const char* path) {
  (void)path;
- throw std::runtime_error("sceKernelUnlink is not implemented");
+ NotImplemented_nid_no_patch(__func__);
+ return 0;
 }
 
 int64_t APS5_VABI sceKernelWrite(int d, const void* buf, size_t nbytes) {
  (void)d;
  (void)buf;
  (void)nbytes;
- throw std::runtime_error("sceKernelWrite is not implemented");
+
+ NotImplemented_nid_no_patch(__func__);
+ return 0;
 }
 
 }
diff --git a/core/libs/prx/libkernel/Semaphore/include/Semaphore.hpp b/core/libs/prx/libkernel/Semaphore/include/Semaphore.hpp
index 530a34ec3..e7c6e49d2 100644
--- a/core/libs/prx/libkernel/Semaphore/include/Semaphore.hpp
+++ b/core/libs/prx/libkernel/Semaphore/include/Semaphore.hpp
@@ -1,10 +1,30 @@
 #ifndef CORE_LIBS_PRX_LIBKERNEL_SEMAPHORE_SEMAPHORE_HPP
 #define CORE_LIBS_PRX_LIBKERNEL_SEMAPHORE_SEMAPHORE_HPP
 
+#include <chrono>
+#include <condition_variable>
 #include <cstdint>
+#include <mutex>
+#include <string>
 
 #include "SceTypes.hpp"
-#include "prx/libc/include/general/VabiMacros.hpp"
+#include "prx/libc/include/General.hpp"
+
+constexpr int KERNEL_SEMA_OK = 0;
+constexpr int KERNEL_SEMA_ERROR_EINVAL = static_cast<int>(0x80020016);
+constexpr int KERNEL_SEMA_ERROR_EBUSY = static_cast<int>(0x80020010);
+constexpr int KERNEL_SEMA_ERROR_ETIMEDOUT = static_cast<int>(0x8002003C);
+
+struct KernelSemaPrivate {
+    KernelSemaPrivate(std::int32_t initCount, std::int32_t maxCount, std::string name, bool isFifo);
+
+    std::mutex mutex;
+    std::condition_variable condition;
+    std::string name;
+    std::int32_t tokenCount;
+    std::int32_t maxCount;
+    bool isFifo;
+};
 
 extern "C" {
 
diff --git a/core/libs/prx/libkernel/Semaphore/src/Semaphore.cpp b/core/libs/prx/libkernel/Semaphore/src/Semaphore.cpp
index 21673c787..e85aba9d3 100644
--- a/core/libs/prx/libkernel/Semaphore/src/Semaphore.cpp
+++ b/core/libs/prx/libkernel/Semaphore/src/Semaphore.cpp
@@ -1,36 +1,71 @@
 #include "prx/libkernel/Semaphore/include/Semaphore.hpp"
 
 #include <stdexcept>
+#include <string>
+#include <utility>
+
+KernelSemaPrivate::KernelSemaPrivate(std::int32_t initCount, std::int32_t maxCount, std::string name, bool isFifo)
+ : name(std::move(name)), tokenCount(initCount), maxCount(maxCount), isFifo(isFifo) {
+}
 
 extern "C" {
 
 int APS5_VABI sceKernelCreateSema(KernelSema* sem, const char* name, uint32_t attr, int init, int max, void* opt) {
- (void)sem;
- (void)name;
- (void)attr;
- (void)init;
- (void)max;
  (void)opt;
- throw std::runtime_error("sceKernelCreateSema is not implemented");
+ if (sem == nullptr || name == nullptr || attr > 2 || init < 0 || max <= 0 || init > max) {
+  APS5_INVALID_ARG_EX;
+ }
+
+ *sem = new KernelSemaPrivate(init, max, std::string(name), attr == 1);
+ return KERNEL_SEMA_OK;
 }
 
 int APS5_VABI sceKernelPollSema(KernelSema sem, int need) {
- (void)sem;
- (void)need;
- throw std::runtime_error("sceKernelPollSema is not implemented");
+ if (sem == nullptr || need <= 0) {
+  APS5_INVALID_ARG_EX;
+ }
+
+ std::lock_guard<std::mutex> lock(sem->mutex);
+ if (sem->tokenCount < need) {
+  return KERNEL_SEMA_ERROR_EBUSY;
+ }
+ sem->tokenCount -= need;
+ return KERNEL_SEMA_OK;
 }
 
 int APS5_VABI sceKernelSignalSema(KernelSema sem, int count) {
- (void)sem;
- (void)count;
- throw std::runtime_error("sceKernelSignalSema is not implemented");
+ if (sem == nullptr || count <= 0) {
+  APS5_INVALID_ARG_EX;
+ }
+
+ std::lock_guard<std::mutex> lock(sem->mutex);
+ if (sem->tokenCount + count > sem->maxCount) {
+  return KERNEL_SEMA_ERROR_EINVAL;
+ }
+ sem->tokenCount += count;
+ sem->condition.notify_all();
+ return KERNEL_SEMA_OK;
 }
 
 int APS5_VABI sceKernelWaitSema(KernelSema sem, int need, KernelUseconds* time) {
- (void)sem;
- (void)need;
- (void)time;
- throw std::runtime_error("sceKernelWaitSema is not implemented");
+ if (sem == nullptr || need <= 0) {
+  APS5_INVALID_ARG_EX;
+ }
+
+ std::unique_lock<std::mutex> lock(sem->mutex);
+ if (time == nullptr) {
+  sem->condition.wait(lock, [&] { return sem->tokenCount >= need; });
+  sem->tokenCount -= need;
+  return KERNEL_SEMA_OK;
+ }
+
+ auto timeout = std::chrono::microseconds(*time);
+ bool acquired = sem->condition.wait_for(lock, timeout, [&] { return sem->tokenCount >= need; });
+ if (!acquired) {
+  return KERNEL_SEMA_ERROR_ETIMEDOUT;
+ }
+ sem->tokenCount -= need;
+ return KERNEL_SEMA_OK;
 }
 
 }