From 9f76b1612439d816e55a722df7a3a62f4718895d Mon Sep 17 00:00:00 2001
From: Timon Kruiper <timonkruiper@gmail.com>
Date: Mon, 2 May 2022 23:01:03 +0200
Subject: Kernel: Implement safe_memcpy for the aarch64 build

The implementation just calls the regular memcpy, and is not safe yet.
This can be done later.
---
 Kernel/Arch/aarch64/Dummy.cpp   | 57 --------------------------------------
 Kernel/Arch/aarch64/SafeMem.cpp | 61 +++++++++++++++++++++++++++++++++++++++++
 Kernel/CMakeLists.txt           |  1 +
 3 files changed, 62 insertions(+), 57 deletions(-)
 create mode 100644 Kernel/Arch/aarch64/SafeMem.cpp

diff --git a/Kernel/Arch/aarch64/Dummy.cpp b/Kernel/Arch/aarch64/Dummy.cpp
index c8f9092861..9c947b330a 100644
--- a/Kernel/Arch/aarch64/Dummy.cpp
+++ b/Kernel/Arch/aarch64/Dummy.cpp
@@ -141,63 +141,6 @@ void KString::operator delete(void*)
     VERIFY_NOT_REACHED();
 }
 
-// SafeMem.h
-bool safe_memset(void*, int, size_t, void*&);
-bool safe_memset(void*, int, size_t, void*&)
-{
-    VERIFY_NOT_REACHED();
-    return false;
-}
-
-ssize_t safe_strnlen(char const*, unsigned long, void*&);
-ssize_t safe_strnlen(char const*, unsigned long, void*&)
-{
-    VERIFY_NOT_REACHED();
-    return 0;
-}
-
-bool safe_memcpy(void*, void const*, unsigned long, void*&);
-bool safe_memcpy(void*, void const*, unsigned long, void*&)
-{
-    VERIFY_NOT_REACHED();
-    return false;
-}
-
-Optional<bool> safe_atomic_compare_exchange_relaxed(u32 volatile*, u32&, u32);
-Optional<bool> safe_atomic_compare_exchange_relaxed(u32 volatile*, u32&, u32)
-{
-    VERIFY_NOT_REACHED();
-    return {};
-}
-
-Optional<u32> safe_atomic_load_relaxed(u32 volatile*);
-Optional<u32> safe_atomic_load_relaxed(u32 volatile*)
-{
-    VERIFY_NOT_REACHED();
-    return {};
-}
-
-Optional<u32> safe_atomic_fetch_add_relaxed(u32 volatile*, u32);
-Optional<u32> safe_atomic_fetch_add_relaxed(u32 volatile*, u32)
-{
-    VERIFY_NOT_REACHED();
-    return {};
-}
-
-Optional<u32> safe_atomic_exchange_relaxed(u32 volatile*, u32);
-Optional<u32> safe_atomic_exchange_relaxed(u32 volatile*, u32)
-{
-    VERIFY_NOT_REACHED();
-    return {};
-}
-
-bool safe_atomic_store_relaxed(u32 volatile*, u32);
-bool safe_atomic_store_relaxed(u32 volatile*, u32)
-{
-    VERIFY_NOT_REACHED();
-    return {};
-}
-
 }
 
 extern "C" {
diff --git a/Kernel/Arch/aarch64/SafeMem.cpp b/Kernel/Arch/aarch64/SafeMem.cpp
new file mode 100644
index 0000000000..93167f1108
--- /dev/null
+++ b/Kernel/Arch/aarch64/SafeMem.cpp
@@ -0,0 +1,61 @@
+/*
+ * Copyright (c) 2022, Timon Kruiper <timonkruiper@gmail.com>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <Kernel/Arch/SafeMem.h>
+#include <Kernel/StdLib.h>
+
+namespace Kernel {
+
+bool safe_memset(void*, int, size_t, void*&)
+{
+    VERIFY_NOT_REACHED();
+    return false;
+}
+
+ssize_t safe_strnlen(char const*, unsigned long, void*&)
+{
+    VERIFY_NOT_REACHED();
+    return 0;
+}
+
+bool safe_memcpy(void* dest_ptr, void const* src_ptr, unsigned long n, void*&)
+{
+    // FIXME: Actually implement a safe memcpy.
+    memcpy(dest_ptr, src_ptr, n);
+    return true;
+}
+
+Optional<bool> safe_atomic_compare_exchange_relaxed(u32 volatile*, u32&, u32)
+{
+    VERIFY_NOT_REACHED();
+    return {};
+}
+
+Optional<u32> safe_atomic_load_relaxed(u32 volatile*)
+{
+    VERIFY_NOT_REACHED();
+    return {};
+}
+
+Optional<u32> safe_atomic_fetch_add_relaxed(u32 volatile*, u32)
+{
+    VERIFY_NOT_REACHED();
+    return {};
+}
+
+Optional<u32> safe_atomic_exchange_relaxed(u32 volatile*, u32)
+{
+    VERIFY_NOT_REACHED();
+    return {};
+}
+
+bool safe_atomic_store_relaxed(u32 volatile*, u32)
+{
+    VERIFY_NOT_REACHED();
+    return {};
+}
+
+}
diff --git a/Kernel/CMakeLists.txt b/Kernel/CMakeLists.txt
index f1a1c6231d..acc4cbf13c 100644
--- a/Kernel/CMakeLists.txt
+++ b/Kernel/CMakeLists.txt
@@ -418,6 +418,7 @@ else()
         Arch/aarch64/kprintf.cpp
         Arch/aarch64/MainIdRegister.cpp
         Arch/aarch64/PageDirectory.cpp
+        Arch/aarch64/SafeMem.cpp
         Arch/aarch64/ScopedCritical.cpp
         Arch/aarch64/SmapDisabler.cpp
         Arch/aarch64/init.cpp
-- 
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