From 2ebf8d525e6a030efc8ca23bcbdf92c2d0cb8985 Mon Sep 17 00:00:00 2001
From: Felix Morgner <felix.morgner@ost.ch>
Date: Thu, 24 Jul 2025 10:17:53 +0000
Subject: x86_64: implement high/low split

---
 cmake/Platforms/x86_64.cmake | 24 ++++--------------------
 1 file changed, 4 insertions(+), 20 deletions(-)

(limited to 'cmake')

diff --git a/cmake/Platforms/x86_64.cmake b/cmake/Platforms/x86_64.cmake
index c84d9ba..8db6142 100644
--- a/cmake/Platforms/x86_64.cmake
+++ b/cmake/Platforms/x86_64.cmake
@@ -1,17 +1,5 @@
 include_guard(GLOBAL)
 
-macro(find_compiler_file NAME OUTPUT_VARIABLE)
-  execute_process(COMMAND
-    "${CMAKE_CXX_COMPILER}"
-    "-mno-red-zone"
-    "-print-file-name=${NAME}"
-    OUTPUT_STRIP_TRAILING_WHITESPACE
-    OUTPUT_VARIABLE "${OUTPUT_VARIABLE}"
-    ERROR_QUIET
-  )
-  mark_as_advanced("${OUTPUT_VARIABLE}")
-endmacro()
-
 set(PLATFORM_TARGET "x86_64-pc-elf")
 
 set(CMAKE_TRY_COMPILE_TARGET_TYPE "STATIC_LIBRARY")
@@ -27,7 +15,8 @@ find_program(CMAKE_CXX_COMPILER "${CMAKE_CXX_COMPILER_TARGET}-g++" REQUIRED)
 
 set(CMAKE_CXX_FLAGS_INIT
 "-mno-red-zone \
--mcmodel=large \
+-mcmodel=kernel \
+-fno-pie \
 -fno-rtti \
 -fno-exceptions \
 -ffunction-sections \
@@ -46,19 +35,14 @@ set(CMAKE_CXX_FLAGS_RELEASE "-O3 -DNDEBUG -ggdb3")
 set(CMAKE_ASM_FLAGS_RELWITHDEBINFO "-O2 -DNDEBUG -ggdb3")
 set(CMAKE_CXX_FLAGS_RELWITHDEBINFO "-O2 -DNDEBUG -ggdb3")
 
-set(CMAKE_EXE_LINKER_FLAGS_INIT "-nostartfiles -Wl,--gc-sections")
-
-find_compiler_file("crtbegin.o" CRT_BEGIN_PATH)
-find_compiler_file("crtend.o" CRT_END_PATH)
+set(CMAKE_EXE_LINKER_FLAGS_INIT "-Wl,--gc-sections")
 
 set(CMAKE_CXX_LINK_EXECUTABLE
 "<CMAKE_CXX_COMPILER> \
 <FLAGS> \
 <CMAKE_CXX_LINK_FLAGS> \
 <LINK_FLAGS> \
-${CRT_BEGIN_PATH} \
 <OBJECTS> \
 -o <TARGET> \
-<LINK_LIBRARIES> \
-${CRT_END_PATH}"
+<LINK_LIBRARIES>"
 )
-- 
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