From 9b12522f37c3f8704e8f8ca8736689dbbf30ce8b Mon Sep 17 00:00:00 2001
From: Felix Morgner <felix.morgner@ost.ch>
Date: Mon, 14 Jul 2025 21:35:43 +0000
Subject: cmake: introduce ELF utility module

---
 .vscode/launch.json                    |  2 +-
 CMakeLists.txt                         |  6 +++++-
 cmake/Modules/ElfTransformations.cmake | 36 ++++++++++++++++++++++++++++++++++
 3 files changed, 42 insertions(+), 2 deletions(-)
 create mode 100644 cmake/Modules/ElfTransformations.cmake

diff --git a/.vscode/launch.json b/.vscode/launch.json
index 7778c04..6739aa3 100644
--- a/.vscode/launch.json
+++ b/.vscode/launch.json
@@ -11,7 +11,7 @@
             "gdbpath": "x86_64-pc-elf-gdb",
             "cwd": "${workspaceFolder}",
             "preLaunchTask": "QEMU (gdb)",
-            "executable": "${command:cmake.buildDirectory}/bin/${command:cmake.buildType}/kernel.elf",
+            "executable": "${command:cmake.buildDirectory}/bin/${command:cmake.buildType}/kernel.sym",
             "autorun": [
                 "-enable-pretty-printing",
                 "-break-insert _start"
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 27500ed..6f7d5a8 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -9,6 +9,7 @@ project("kernel"
 
 set(CMAKE_MODULE_PATH "${PROJECT_SOURCE_DIR}/cmake/Modules")
 
+include("ElfTransformations")
 include("GenerateBootableIso")
 
 #[============================================================================[
@@ -38,8 +39,11 @@ target_link_libraries("kernel" PRIVATE
     "os::kern"
 )
 
-target_generate_bootable_iso("kernel")
+target_disassemble("kernel")
+target_extract_debug_symbols("kernel")
+target_strip("kernel")
 
+target_generate_bootable_iso("kernel")
 
 # #[============================================================================[
 # # Documentation
diff --git a/cmake/Modules/ElfTransformations.cmake b/cmake/Modules/ElfTransformations.cmake
new file mode 100644
index 0000000..dfc8576
--- /dev/null
+++ b/cmake/Modules/ElfTransformations.cmake
@@ -0,0 +1,36 @@
+include_guard(GLOBAL)
+
+function(target_extract_debug_symbols TARGET)
+    add_custom_command(TARGET "${TARGET}"
+        POST_BUILD
+        COMMAND "${CMAKE_OBJCOPY}"
+        "--only-keep-debug"
+        "$<TARGET_FILE:${TARGET}>"
+        "$<TARGET_FILE_DIR:${TARGET}>/$<TARGET_FILE_BASE_NAME:${TARGET}>.sym"
+        BYPRODUCTS "${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/$<CONFIGURATION>/${TARGET}.sym"
+        COMMENT "Extracting debug symbols from $<TARGET_FILE:${TARGET}> ..."
+    )
+endfunction()
+
+function(target_strip TARGET)
+    add_custom_command(TARGET "${TARGET}"
+        POST_BUILD
+        COMMAND "${CMAKE_STRIP}"
+        "$<TARGET_FILE:${TARGET}>"
+        COMMENT "Stripping $<TARGET_FILE:${TARGET}> ..."
+    )
+endfunction()
+
+function(target_disassemble TARGET)
+    add_custom_command(TARGET "${TARGET}"
+        POST_BUILD
+        COMMAND "${CMAKE_OBJDUMP}"
+        "--disassemble"
+        "--visualize-jumps"
+        "--demangle"
+        "$<TARGET_FILE:${TARGET}>"
+        ">$<TARGET_FILE_DIR:${TARGET}>/$<TARGET_FILE_BASE_NAME:${TARGET}>.dis"
+        BYPRODUCTS "${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/$<CONFIGURATION>/${TARGET}.dis"
+        COMMENT "Dumping disassembly for $<TARGET_FILE:${TARGET}> ..."
+    )
+endfunction()
-- 
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