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Kernel: Build the x86_64 kernel as an ELF32 executable

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Multiboot only supports ELF32 executables. This changes the build
process to build an ELF32 executable which has a 32-bit entry point,
but consists of mostly 64-bit code.
This commit is contained in:
Gunnar Beutner 2021-06-24 13:08:19 +02:00 • committed by Andreas Kling
parent 04ba5cfcad
commit c9747a3236
3 changed files with 37 additions and 11 deletions
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29
Kernel/CMakeLists.txt
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@ -387,22 +387,35 @@ else()
link_directories(${TOOLCHAIN_ROOT}/Kernel/lib/gcc/${SERENITY_ARCH}-pc-serenity/${GCC_VERSION}/)
endif()
add_executable(Kernel ${SOURCES})
add_dependencies(Kernel generate_EscapeSequenceStateMachine.h)
if ("${SERENITY_ARCH}" STREQUAL "i686")
set(KERNEL_TARGET Kernel32)
else()
set(KERNEL_TARGET Kernel64)
endif()
set_target_properties(Kernel PROPERTIES LINK_DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/linker.ld)
add_executable(${KERNEL_TARGET} ${SOURCES})
add_dependencies(${KERNEL_TARGET} generate_EscapeSequenceStateMachine.h)
set_target_properties(${KERNEL_TARGET} PROPERTIES LINK_DEPENDS ${CMAKE_CURRENT_SOURCE_DIR}/linker.ld)
if (ENABLE_KERNEL_LTO)
include(CheckIPOSupported)
check_ipo_supported()
set_property(TARGET Kernel PROPERTY INTERPROCEDURAL_OPTIMIZATION TRUE)
set_property(TARGET ${KERNEL_TARGET} PROPERTY INTERPROCEDURAL_OPTIMIZATION TRUE)
endif()
target_link_libraries(Kernel kernel_heap gcc supc++)
add_dependencies(Kernel kernel_heap)
install(TARGETS Kernel RUNTIME DESTINATION boot)
target_link_libraries(${KERNEL_TARGET} kernel_heap gcc supc++)
add_dependencies(${KERNEL_TARGET} kernel_heap)
add_custom_command(
TARGET Kernel
TARGET ${KERNEL_TARGET} POST_BUILD
COMMAND ${TOOLCHAIN_PREFIX}objcopy -O elf32-i386 ${CMAKE_CURRENT_BINARY_DIR}/${KERNEL_TARGET} ${CMAKE_CURRENT_BINARY_DIR}/Kernel
BYPRODUCTS ${CMAKE_CURRENT_BINARY_DIR}/Kernel
)
install(FILES "${CMAKE_CURRENT_BINARY_DIR}/Kernel" DESTINATION boot)
add_custom_command(
TARGET ${KERNEL_TARGET} POST_BUILD
COMMAND sh ${CMAKE_CURRENT_SOURCE_DIR}/mkmap.sh
)
install(FILES ${CMAKE_CURRENT_BINARY_DIR}/kernel.map DESTINATION res)