8c9863eb1e
In order to run hermetic tests downstream (#145349), we need startup
code. This is based on the crt0 that is present in Arm Toolchain:
5446a3cbf4/arm-software/embedded/llvmlibc-support/crt0.
Note that some tests do fail due to lack of hardware setup, which will
be implemented at a later time.
Most of the CMake/structure is a copy from the existing code in both
`libc/startup/linux` and `libc/startup/gpu`. It is required to build an
object file to be linked with.
Also add header files for init/fini such that crt0 can use the provided
symbols.
---------
Co-authored-by: Michael Jones <michaelrj@google.com>
76 lines
1.7 KiB
CMake
76 lines
1.7 KiB
CMake
# TODO: Use generic "add_startup_object" https://github.com/llvm/llvm-project/issues/133156
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function(add_startup_object name)
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cmake_parse_arguments(
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"ADD_STARTUP_OBJECT"
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"ALIAS" # Option argument
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"SRC" # Single value arguments
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"DEPENDS;COMPILE_OPTIONS" # Multi value arguments
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${ARGN}
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)
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get_fq_target_name(${name} fq_target_name)
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if(ADD_STARTUP_OBJECT_ALIAS)
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get_fq_deps_list(fq_dep_list ${ADD_STARTUP_OBJECT_DEPENDS})
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add_library(${fq_target_name} ALIAS ${fq_dep_list})
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return()
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endif()
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add_object_library(
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${name}
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SRCS ${ADD_STARTUP_OBJECT_SRC}
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COMPILE_OPTIONS ${ADD_STARTUP_OBJECT_COMPILE_OPTIONS}
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${ADD_STARTUP_OBJECT_UNPARSED_ARGUMENTS}
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DEPENDS ${ADD_STARTUP_OBJECT_DEPENDS}
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)
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set_target_properties(
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${fq_target_name}
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PROPERTIES
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OUTPUT_NAME ${name}.o
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)
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endfunction()
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add_entrypoint_object(
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init
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SRCS
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init.cpp
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DEPENDS
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libc.hdr.stdint_proxy
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libc.src.__support.common
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HDRS
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init.h
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)
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add_entrypoint_object(
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fini
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SRCS
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fini.cpp
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DEPENDS
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libc.hdr.stdint_proxy
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libc.src.__support.common
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HDRS
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fini.h
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)
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if(EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/${LIBC_TARGET_ARCHITECTURE})
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add_subdirectory(${LIBC_TARGET_ARCHITECTURE})
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else()
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message(WARNING "Cannot build 'crt1.o' for ${LIBC_TARGET_ARCHITECTURE} yet.")
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return()
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endif()
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add_startup_object(
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crt1
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ALIAS
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DEPENDS
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.${LIBC_TARGET_ARCHITECTURE}.crt1
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)
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add_custom_target(libc-startup)
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set(fq_target_name libc.startup.baremetal.${LIBC_TARGET_ARCHITECTURE}.crt1)
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add_dependencies(libc-startup ${fq_target_name})
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install(FILES $<TARGET_OBJECTS:${fq_target_name}>
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DESTINATION ${LIBC_INSTALL_LIBRARY_DIR}
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RENAME $<TARGET_PROPERTY:${fq_target_name},OUTPUT_NAME>
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COMPONENT libc)
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