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Userspace: Write a dynamic loader

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This allows running executing dynamically linked executables!
This commit is contained in:
Bananymous
2024-09-05 12:56:50 +03:00
parent f30947336a
commit aa7e92b275
6 changed files with 1178 additions and 1 deletions
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25
userspace/programs/DynamicLoader/CMakeLists.txt Normal file
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set(SOURCES
main.cpp
utils.cpp
)
add_executable(DynamicLoader ${SOURCES})
target_compile_options(DynamicLoader PRIVATE -fno-tree-loop-distribute-patterns -fno-rtti -pie -fpie -ffunction-sections -fdata-sections -mgeneral-regs-only)
target_compile_options(DynamicLoader PRIVATE -Wall -Wextra -Werror)
target_compile_definitions(DynamicLoader PRIVATE __arch=${BANAN_ARCH})
target_link_options(DynamicLoader PRIVATE -nolibc -nostartfiles -static-libgcc -pie -fpie)
target_link_options(DynamicLoader PRIVATE LINKER:--no-dynamic-linker)
# DynamicLoader does not support relocating itself
add_custom_command(
TARGET DynamicLoader POST_BUILD
COMMAND readelf --relocs $<TARGET_FILE:DynamicLoader> | grep -q 'There are no relocations in this file'
)
banan_include_headers(DynamicLoader ban)
banan_include_headers(DynamicLoader kernel)
banan_include_headers(DynamicLoader libc)
banan_include_headers(DynamicLoader libelf)
set_target_properties(DynamicLoader PROPERTIES OUTPUT_NAME DynamicLoader.so)
install(TARGETS DynamicLoader DESTINATION ${CMAKE_INSTALL_LIBDIR} OPTIONAL)