LibELF: Add helpers for setting the thread pointer register

Userland/DynamicLoader/CMakeLists.txt

@@ -10,7 +10,7 @@ file(GLOB LIBC_SOURCES2 "../Libraries/LibC/*/*.cpp")
 set(ARCH_FOLDER "${SERENITY_ARCH}")
 
 file(GLOB LIBC_SOURCES3 "../Libraries/LibC/arch/${ARCH_FOLDER}/*.S")
-set(ELF_SOURCES ${ELF_SOURCES} "../Libraries/LibELF/Arch/${ARCH_FOLDER}/entry.S" "../Libraries/LibELF/Arch/${ARCH_FOLDER}/plt_trampoline.S")
+set(ELF_SOURCES ${ELF_SOURCES} "../Libraries/LibELF/Arch/${ARCH_FOLDER}/entry.S" "../Libraries/LibELF/Arch/${ARCH_FOLDER}/plt_trampoline.S" "../Libraries/LibELF/Arch/${ARCH_FOLDER}/tls.cpp")
 set(LIBC_SOURCES3 ${LIBC_SOURCES3} "../Libraries/LibC/arch/${ARCH_FOLDER}/fenv.cpp")
 if ("${SERENITY_ARCH}" STREQUAL "x86_64")
     set(LIBC_SOURCES3 ${LIBC_SOURCES3} "../Libraries/LibC/arch/x86_64/memset.cpp")

Userland/Libraries/LibC/CMakeLists.txt

@@ -97,7 +97,7 @@ foreach(RELATIVE_HEADER_PATH IN LISTS LIBC_HEADERS)
     )
 endforeach()
 
-file(GLOB ELF_SOURCES CONFIGURE_DEPENDS "../LibELF/*.cpp")
+file(GLOB ELF_SOURCES CONFIGURE_DEPENDS "../LibELF/*.cpp" "../LibELF/Arch/${SERENITY_ARCH}/*.cpp")
 
 if ("${SERENITY_ARCH}" STREQUAL "aarch64")
     set(LIBC_SOURCES ${LIBC_SOURCES} "arch/aarch64/fenv.cpp")

Userland/Libraries/LibELF/Arch/aarch64/tls.cpp

@@ -0,0 +1,16 @@
+/*
+ * Copyright (c) 2024, Sönke Holz <sholz8530@gmail.com>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibELF/Arch/tls.h>
+
+namespace ELF {
+
+void set_thread_pointer_register(FlatPtr value)
+{
+    asm volatile("msr tpidr_el0, %0" ::"r"(value));
+}
+
+}

Userland/Libraries/LibELF/Arch/riscv64/tls.cpp

@@ -0,0 +1,16 @@
+/*
+ * Copyright (c) 2024, Sönke Holz <sholz8530@gmail.com>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <LibELF/Arch/tls.h>
+
+namespace ELF {
+
+void set_thread_pointer_register(FlatPtr value)
+{
+    asm volatile("mv tp, %0" ::"r"(value));
+}
+
+}

Userland/Libraries/LibELF/Arch/tls.h

@@ -0,0 +1,15 @@
+/*
+ * Copyright (c) 2024, Sönke Holz <sholz8530@gmail.com>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <AK/Types.h>
+
+namespace ELF {
+
+void set_thread_pointer_register(FlatPtr);
+
+}

Userland/Libraries/LibELF/Arch/x86_64/tls.cpp

@@ -0,0 +1,18 @@
+/*
+ * Copyright (c) 2024, Sönke Holz <sholz8530@gmail.com>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <AK/Assertions.h>
+#include <LibELF/Arch/tls.h>
+#include <sys/archctl.h>
+
+namespace ELF {
+
+void set_thread_pointer_register(FlatPtr)
+{
+    TODO();
+}
+
+}