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Kernel: Use the C preprocessor to avoid two copies of the linker script
This commit is contained in:
parent
56f952a5f2
commit
2019cf3289
Notes:
sideshowbarker
2024-07-18 08:41:46 +09:00
Author: https://github.com/gunnarbeutner Commit: https://github.com/SerenityOS/serenity/commit/2019cf3289e Pull-request: https://github.com/SerenityOS/serenity/pull/8891 Reviewed-by: https://github.com/ADKaster Reviewed-by: https://github.com/dascandy
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@ -356,11 +356,9 @@ endif()
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if ("${SERENITY_ARCH}" STREQUAL "x86_64")
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set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -mcmodel=large -fno-pic -mno-red-zone")
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set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -faligned-new=8")
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set(KERNEL_LINKER_SCRIPT ${CMAKE_CURRENT_SOURCE_DIR}/linker_amd64.ld)
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else()
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set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -pie -fPIE")
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set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -faligned-new=4")
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set(KERNEL_LINKER_SCRIPT ${CMAKE_CURRENT_SOURCE_DIR}/linker_i386.ld)
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endif()
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# Kernel Undefined Behavior Sanitizer (KUBSAN)
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@ -396,8 +394,18 @@ endif()
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add_executable(Kernel ${SOURCES})
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add_dependencies(Kernel generate_EscapeSequenceStateMachine.h)
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target_link_options(Kernel PRIVATE LINKER:-T ${KERNEL_LINKER_SCRIPT} -nostdlib)
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set_target_properties(Kernel PROPERTIES LINK_DEPENDS ${KERNEL_LINKER_SCRIPT})
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add_custom_command(
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OUTPUT linker.ld
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COMMAND "${CMAKE_CXX_COMPILER}" -E -P -x c -I${CMAKE_CURRENT_SOURCE_DIR}/.. "${CMAKE_CURRENT_SOURCE_DIR}/linker.ld" -o "${CMAKE_CURRENT_BINARY_DIR}/linker.ld"
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MAIN_DEPENDENCY "${CMAKE_CURRENT_SOURCE_DIR}/linker.ld"
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COMMENT "Preprocessing linker.ld"
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VERBATIM
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)
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add_custom_target(generate_kernel_linker_script DEPENDS linker.ld)
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target_link_options(Kernel PRIVATE LINKER:-T ${CMAKE_CURRENT_BINARY_DIR}/linker.ld -nostdlib)
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set_target_properties(Kernel PROPERTIES LINK_DEPENDS "${CMAKE_CURRENT_BINARY_DIR}/linker.ld")
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if (ENABLE_KERNEL_LTO)
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include(CheckIPOSupported)
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@ -1,6 +1,14 @@
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#include <AK/Platform.h>
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ENTRY(init)
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KERNEL_VIRTUAL_BASE = 0x2000000000;
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#if ARCH(I386)
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# define KERNEL_BASE 0xc0000000
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#else
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# define KERNEL_BASE 0x2000000000
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#endif
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KERNEL_VIRTUAL_BASE = KERNEL_BASE;
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PHDRS
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{
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@ -1,96 +0,0 @@
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ENTRY(init)
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KERNEL_VIRTUAL_BASE = 0xc0000000;
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PHDRS
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{
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super_pages PT_LOAD ;
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text PT_LOAD ;
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data PT_LOAD ;
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bss PT_LOAD ;
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ksyms PT_LOAD ;
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}
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SECTIONS
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{
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. = KERNEL_VIRTUAL_BASE + 0x00200000;
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start_of_kernel_image = .;
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.super_pages ALIGN(4K) (NOLOAD) : AT (ADDR(.super_pages) - KERNEL_VIRTUAL_BASE)
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{
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*(.super_pages)
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} :super_pages
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.text ALIGN(4K) : AT (ADDR(.text) - KERNEL_VIRTUAL_BASE)
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{
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start_of_kernel_text = .;
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start_of_safemem_text = .;
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KEEP(*(.text.safemem))
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end_of_safemem_text = .;
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start_of_safemem_atomic_text = .;
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KEEP(*(.text.safemem.atomic))
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end_of_safemem_atomic_text = .;
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*(.text*)
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} :text
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.unmap_after_init ALIGN(4K) : AT (ADDR(.unmap_after_init) - KERNEL_VIRTUAL_BASE)
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{
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start_of_unmap_after_init = .;
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*(.unmap_after_init*);
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end_of_unmap_after_init = .;
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end_of_kernel_text = .;
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} :text
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.rodata ALIGN(4K) : AT (ADDR(.rodata) - KERNEL_VIRTUAL_BASE)
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{
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start_heap_ctors = .;
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*libkernel_heap.a:*(.ctors)
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end_heap_ctors = .;
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start_ctors = .;
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*(.ctors)
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end_ctors = .;
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*(.rodata*)
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} :data
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.data ALIGN(4K) : AT (ADDR(.data) - KERNEL_VIRTUAL_BASE)
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{
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start_of_kernel_data = .;
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*(.data*)
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end_of_kernel_data = .;
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} :data
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.ro_after_init ALIGN(4K) (NOLOAD) : AT(ADDR(.ro_after_init) - KERNEL_VIRTUAL_BASE)
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{
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start_of_ro_after_init = .;
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*(.ro_after_init);
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end_of_ro_after_init = .;
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} :data
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.bss ALIGN(4K) (NOLOAD) : AT (ADDR(.bss) - KERNEL_VIRTUAL_BASE)
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{
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start_of_kernel_bss = .;
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*(page_tables)
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*(COMMON)
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*(.bss)
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end_of_kernel_bss = .;
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. = ALIGN(4K);
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*(.heap)
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} :bss
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.ksyms ALIGN(4K) : AT (ADDR(.ksyms) - KERNEL_VIRTUAL_BASE)
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{
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start_of_kernel_ksyms = .;
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*(.kernel_symbols)
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end_of_kernel_ksyms = .;
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} :ksyms
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end_of_kernel_image = .;
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}
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