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armclang: support for armclang compiler and armlink linker
This is the initial support for the armclang compiler together with the armlink linker. Introduced in this commit: - armclang compiler support - armlink linker support - armlink scatter file generator for scatter loading - dual pass linker script generation Signed-off-by: Torsten Rasmussen <[email protected]>
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‎cmake/compiler/armclang/compiler_flags.cmake‎

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# First step is to inherit all properties from gcc, as clang is compatible with most flags.
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include(${ZEPHYR_BASE}/cmake/compiler/clang/compiler_flags.cmake)
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# Required ASM flags when using armclang, this should be handled by CMake, but
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# fails because of: https://gitlab.kitware.com/cmake/cmake/-/issues/19963
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set_property(TARGET asm APPEND PROPERTY required "--target=${triple}")

‎cmake/compiler/armclang/generic.cmake‎

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# SPDX-License-Identifier: Apache-2.0
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# Configures CMake for using ccac
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find_program(CMAKE_C_COMPILER ${CROSS_COMPILE}armclang PATH ${TOOLCHAIN_HOME}/bin NO_DEFAULT_PATH)
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set(triple arm-arm-none-eabi)
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set(CMAKE_DTS_PREPROCESSOR
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${CMAKE_C_COMPILER}
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"--target=${triple}"
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# -march=armv6-m is added to silence the warnings:
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# 'armv4t' and 'arm7tdmi' is unsupported.
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# We only do preprocessing so the actual arch is not important.
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"-march=armv6-m"
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)
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set(CMAKE_C_COMPILER_TARGET ${triple})
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set(CMAKE_ASM_COMPILER_TARGET ${triple})
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set(CMAKE_CXX_COMPILER_TARGET ${triple})
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if(CMAKE_C_COMPILER STREQUAL CMAKE_C_COMPILER-NOTFOUND)
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message(FATAL_ERROR "Zephyr was unable to find the armclang compiler")
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endif()
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execute_process(
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COMMAND ${CMAKE_C_COMPILER} --version
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RESULT_VARIABLE ret
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OUTPUT_QUIET
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ERROR_QUIET
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)
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if(ret)
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message(FATAL_ERROR "Executing the below command failed. "
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"Are permissions set correctly? '${CMAKE_C_COMPILER} --version' "
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"And is the license setup correctly ?"
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)
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endif()

‎cmake/compiler/armclang/target.cmake‎

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# find the compilers for C, CPP, assembly
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find_program(CMAKE_C_COMPILER ${CROSS_COMPILE}armclang PATH ${TOOLCHAIN_HOME} NO_DEFAULT_PATH)
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find_program(CMAKE_CXX_COMPILER ${CROSS_COMPILE}armclang PATH ${TOOLCHAIN_HOME} NO_DEFAULT_PATH)
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find_program(CMAKE_ASM_COMPILER ${CROSS_COMPILE}armclang PATH ${TOOLCHAIN_HOME} NO_DEFAULT_PATH)
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# The CMAKE_REQUIRED_FLAGS variable is used by check_c_compiler_flag()
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# (and other commands which end up calling check_c_source_compiles())
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# to add additional compiler flags used during checking. These flags
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# are unused during "real" builds of Zephyr source files linked into
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# the final executable.
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#
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include(${ZEPHYR_BASE}/cmake/gcc-m-cpu.cmake)
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set(CMAKE_SYSTEM_PROCESSOR ${GCC_M_CPU})
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list(APPEND TOOLCHAIN_C_FLAGS
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-fshort-enums
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)
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if(CONFIG_ARM64)
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list(APPEND TOOLCHAIN_C_FLAGS -mcpu=${GCC_M_CPU})
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list(APPEND TOOLCHAIN_C_FLAGS -mabi=lp64)
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list(APPEND TOOLCHAIN_LD_FLAGS -mabi=lp64)
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else()
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list(APPEND TOOLCHAIN_C_FLAGS -mcpu=${GCC_M_CPU})
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if(CONFIG_COMPILER_ISA_THUMB2)
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list(APPEND TOOLCHAIN_C_FLAGS -mthumb)
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endif()
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list(APPEND TOOLCHAIN_C_FLAGS -mabi=aapcs)
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# Defines a mapping from GCC_M_CPU to FPU
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if(CONFIG_CPU_HAS_FPU_DOUBLE_PRECISION)
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set(PRECISION_TOKEN)
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else()
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set(PRECISION_TOKEN sp-)
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endif()
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set(FPU_FOR_cortex-m4 fpv4-${PRECISION_TOKEN}d16)
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set(FPU_FOR_cortex-m7 fpv5-${PRECISION_TOKEN}d16)
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set(FPU_FOR_cortex-m33 fpv5-${PRECISION_TOKEN}d16)
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if(CONFIG_FPU)
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list(APPEND TOOLCHAIN_C_FLAGS -mfpu=${FPU_FOR_${GCC_M_CPU}})
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if (CONFIG_FP_SOFTABI)
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list(APPEND TOOLCHAIN_C_FLAGS -mfloat-abi=softfp)
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elseif(CONFIG_FP_HARDABI)
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list(APPEND TOOLCHAIN_C_FLAGS -mfloat-abi=hard)
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endif()
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endif()
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endif()
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foreach(file_name include/stddef.h)
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execute_process(
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COMMAND ${CMAKE_C_COMPILER} --print-file-name=${file_name}
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OUTPUT_VARIABLE _OUTPUT
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)
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get_filename_component(_OUTPUT "${_OUTPUT}" DIRECTORY)
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string(REGEX REPLACE "\n" "" _OUTPUT ${_OUTPUT})
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list(APPEND NOSTDINC ${_OUTPUT})
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endforeach()
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foreach(isystem_include_dir ${NOSTDINC})
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list(APPEND isystem_include_flags -isystem ${isystem_include_dir})
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endforeach()
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set(CMAKE_REQUIRED_FLAGS -nostartfiles -nostdlib ${isystem_include_flags})
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string(REPLACE ";" " " CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS}")
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# Load toolchain_cc-family macros
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macro(toolchain_cc_nostdinc)
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if(NOT "${ARCH}" STREQUAL "posix")
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zephyr_compile_options( -nostdinc)
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endif()
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endmacro()

‎cmake/linker/armlink/scatter_script.cmake‎

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cmake_minimum_required(VERSION 3.17)
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set(SORT_TYPE_NAME Lexical)
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#
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# String functions - start
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#
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function(system_to_string)
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cmake_parse_arguments(STRING "" "OBJECT;STRING" "" ${ARGN})
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get_property(name GLOBAL PROPERTY ${STRING_OBJECT}_NAME)
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get_property(regions GLOBAL PROPERTY ${STRING_OBJECT}_REGIONS)
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get_property(format GLOBAL PROPERTY ${STRING_OBJECT}_FORMAT)
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foreach(region ${regions})
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get_property(empty GLOBAL PROPERTY ${region}_EMPTY)
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if(NOT empty)
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to_string(OBJECT ${region} STRING ${STRING_STRING})
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endif()
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endforeach()
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set(${STRING_STRING} ${${STRING_STRING}} PARENT_SCOPE)
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endfunction()
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function(group_to_string)
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cmake_parse_arguments(STRING "" "OBJECT;STRING" "" ${ARGN})
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get_property(type GLOBAL PROPERTY ${STRING_OBJECT}_OBJ_TYPE)
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if(${type} STREQUAL REGION)
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get_property(name GLOBAL PROPERTY ${STRING_OBJECT}_NAME)
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get_property(address GLOBAL PROPERTY ${STRING_OBJECT}_ADDRESS)
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get_property(size GLOBAL PROPERTY ${STRING_OBJECT}_SIZE)
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set(${STRING_STRING} "${${STRING_STRING}}\n${name} ${address} NOCOMPRESS ${size}\n{\n")
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endif()
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get_property(sections GLOBAL PROPERTY ${STRING_OBJECT}_SECTIONS_FIXED)
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foreach(section ${sections})
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to_string(OBJECT ${section} STRING ${STRING_STRING})
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endforeach()
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get_property(groups GLOBAL PROPERTY ${STRING_OBJECT}_GROUPS)
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foreach(group ${groups})
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to_string(OBJECT ${group} STRING ${STRING_STRING})
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endforeach()
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get_property(sections GLOBAL PROPERTY ${STRING_OBJECT}_SECTIONS)
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foreach(section ${sections})
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to_string(OBJECT ${section} STRING ${STRING_STRING})
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endforeach()
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get_parent(OBJECT ${STRING_OBJECT} PARENT parent TYPE SYSTEM)
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get_property(regions GLOBAL PROPERTY ${parent}_REGIONS)
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list(REMOVE_ITEM regions ${STRING_OBJECT})
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foreach(region ${regions})
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get_property(vma GLOBAL PROPERTY ${region}_NAME)
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get_property(sections GLOBAL PROPERTY ${STRING_OBJECT}_${vma}_SECTIONS_FIXED)
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foreach(section ${sections})
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to_string(OBJECT ${section} STRING ${STRING_STRING})
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endforeach()
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get_property(groups GLOBAL PROPERTY ${STRING_OBJECT}_${vma}_GROUPS)
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foreach(group ${groups})
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to_string(OBJECT ${group} STRING ${STRING_STRING})
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endforeach()
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get_property(sections GLOBAL PROPERTY ${STRING_OBJECT}_${vma}_SECTIONS)
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foreach(section ${sections})
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to_string(OBJECT ${section} STRING ${STRING_STRING})
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endforeach()
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endforeach()
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get_property(symbols GLOBAL PROPERTY ${STRING_OBJECT}_SYMBOLS)
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foreach(symbol ${symbols})
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to_string(OBJECT ${symbol} STRING ${STRING_STRING})
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endforeach()
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if(${type} STREQUAL REGION)
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set(${STRING_STRING} "${${STRING_STRING}}\n}\n")
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endif()
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set(${STRING_STRING} ${${STRING_STRING}} PARENT_SCOPE)
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endfunction()
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function(section_to_string)
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cmake_parse_arguments(STRING "" "SECTION;STRING" "" ${ARGN})
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get_property(name GLOBAL PROPERTY ${STRING_SECTION}_NAME)
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get_property(address GLOBAL PROPERTY ${STRING_SECTION}_ADDRESS)
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get_property(type GLOBAL PROPERTY ${STRING_SECTION}_TYPE)
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get_property(align GLOBAL PROPERTY ${STRING_SECTION}_ALIGN)
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get_property(subalign GLOBAL PROPERTY ${STRING_SECTION}_SUBALIGN)
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get_property(endalign GLOBAL PROPERTY ${STRING_SECTION}_ENDALIGN)
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get_property(vma GLOBAL PROPERTY ${STRING_SECTION}_VMA)
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get_property(lma GLOBAL PROPERTY ${STRING_SECTION}_LMA)
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get_property(noinput GLOBAL PROPERTY ${STRING_SECTION}_NOINPUT)
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get_property(noinit GLOBAL PROPERTY ${STRING_SECTION}_NOINIT)
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string(REGEX REPLACE "^[\.]" "" name_clean "${name}")
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string(REPLACE "." "_" name_clean "${name_clean}")
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set(TEMP " ${name_clean}")
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if(DEFINED address)
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set(TEMP "${TEMP} ${address}")
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else()
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set(TEMP "${TEMP} +0")
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endif()
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if(noinit)
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# Currently we simply uses offset +0, but we must support offset defined
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# externally.
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set(TEMP "${TEMP} UNINIT")
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endif()
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if(subalign)
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# Currently we simply uses offset +0, but we must support offset defined
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# externally.
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set(TEMP "${TEMP} ALIGN ${subalign}")
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endif()
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if(NOT noinput)
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set(TEMP "${TEMP}\n {")
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if("${type}" STREQUAL NOLOAD)
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set(TEMP "${TEMP}\n *.o(${name}*)")
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set(TEMP "${TEMP}\n *.o(${name}*.*)")
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elseif(VMA_FLAGS)
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# ToDo: Proper names as provided by armclang
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# set(TEMP "${TEMP}\n *.o(${SEC_NAME}*, +${VMA_FLAGS})")
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# set(TEMP "${TEMP}\n *.o(${SEC_NAME}*.*, +${VMA_FLAGS})")
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set(TEMP "${TEMP}\n *.o(${name}*)")
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set(TEMP "${TEMP}\n *.o(${name}*.*)")
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else()
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set(TEMP "${TEMP}\n *.o(${name}*)")
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set(TEMP "${TEMP}\n *.o(${name}*.*)")
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endif()
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else()
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set(empty TRUE)
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endif()
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get_property(indicies GLOBAL PROPERTY ${STRING_SECTION}_SETTINGS_INDICIES)
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foreach(idx ${indicies})
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get_property(align GLOBAL PROPERTY ${STRING_SECTION}_SETTING_${idx}_ALIGN)
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get_property(any GLOBAL PROPERTY ${STRING_SECTION}_SETTING_${idx}_ANY)
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get_property(first GLOBAL PROPERTY ${STRING_SECTION}_SETTING_${idx}_FIRST)
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get_property(keep GLOBAL PROPERTY ${STRING_SECTION}_SETTING_${idx}_KEEP)
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get_property(sort GLOBAL PROPERTY ${STRING_SECTION}_SETTING_${idx}_SORT)
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get_property(flags GLOBAL PROPERTY ${STRING_SECTION}_SETTING_${idx}_FLAGS)
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get_property(input GLOBAL PROPERTY ${STRING_SECTION}_SETTING_${idx}_INPUT)
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get_property(offset GLOBAL PROPERTY ${STRING_SECTION}_SETTING_${idx}_OFFSET)
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if(DEFINED offset)
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set(section_close TRUE)
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math(EXPR offset_dec "${offset} + 0")
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if(empty)
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set(TEMP "${TEMP} EMPTY 0x0\n {")
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set(empty FALSE)
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endif()
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set(last_index ${offset_dec})
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if(sort)
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set(sorttype "SORTTYPE ${SORT_TYPE_${sort}}")
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endif()
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set(TEMP "${TEMP}\n }")
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set(TEMP "${TEMP}\n ${name_clean}_${offset_dec} (ImageBase(${name_clean}) + ${offset}) ${sorttype}\n {")
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elseif(sort)
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set(section_close TRUE)
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if(empty)
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set(TEMP "${TEMP} EMPTY 0x0\n {")
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set(empty FALSE)
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endif()
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set(last_index ${idx})
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set(TEMP "${TEMP}\n }")
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set(TEMP "${TEMP}\n ${name_clean}_${idx} +0 SORTTYPE ${SORT_TYPE_${sort}}\n {")
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endif()
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if(empty)
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set(TEMP "${TEMP}\n {")
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set(empty FALSE)
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endif()
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foreach(setting ${input})
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#set(SETTINGS ${SETTINGS_INPUT})
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# # ToDo: The code below had en error in original implementation, causing
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# # settings not to be applied
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# # Verify behaviour and activate if working as intended.
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# if(align)
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# set(setting "${setting}, OVERALIGN ${align}")
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# endif()
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#if(SETTINGS_KEEP)
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# armlink has --keep=<section_id>, but is there an scatter equivalant ?
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#endif()
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if(first)
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set(setting "${setting}, +First")
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set(first "")
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endif()
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set(TEMP "${TEMP}\n *.o(${setting})")
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endforeach()
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if(any)
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if(NOT flags)
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message(FATAL_ERROR ".ANY requires flags to be set.")
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endif()
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string(REPLACE ";" " " flags "${flags}")
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set(TEMP "${TEMP}\n .ANY (${flags})")
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endif()
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endforeach()
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if(section_close OR DEFINED endalign)
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set(section_close)
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set(TEMP "${TEMP}\n }")
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if(DEFINED endalign)
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if(DEFINED last_index)
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set(align_expr "AlignExpr(ImageLimit(${name_clean}_${last_index}), ${endalign}) FIXED")
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else()
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set(align_expr "AlignExpr(ImageLimit(${name_clean}), ${endalign}) FIXED")
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endif()
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else()
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set(align_expr "+0")
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endif()
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set(TEMP "${TEMP}\n ${name_clean}_end ${align_expr} EMPTY 0x0\n {")
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set(last_index)
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endif()
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set(TEMP "${TEMP}")
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# ToDo: add patterns here.
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set(TEMP "${TEMP}\n }")
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set(${STRING_STRING} "${${STRING_STRING}}\n${TEMP}\n" PARENT_SCOPE)
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endfunction()
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function(symbol_to_string)
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cmake_parse_arguments(STRING "" "SYMBOL;STRING" "" ${ARGN})
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get_property(name GLOBAL PROPERTY ${STRING_SYMBOL}_NAME)
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get_property(expr GLOBAL PROPERTY ${STRING_SYMBOL}_EXPR)
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get_property(size GLOBAL PROPERTY ${STRING_SYMBOL}_SIZE)
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get_property(symbol GLOBAL PROPERTY ${STRING_SYMBOL}_SYMBOL)
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get_property(subalign GLOBAL PROPERTY ${STRING_SYMBOL}_SUBALIGN)
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string(REPLACE "\\" "" expr "${expr}")
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string(REGEX MATCHALL "%([^%]*)%" match_res ${expr})
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foreach(match ${match_res})
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string(REPLACE "%" "" match ${match})
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get_property(symbol_val GLOBAL PROPERTY SYMBOL_TABLE_${match})
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string(REPLACE "%${match}%" "ImageBase(${symbol_val})" expr ${expr})
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endforeach()
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if(DEFINED subalign)
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set(subalign "ALIGN ${subalign}")
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endif()
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if(NOT DEFINED size)
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set(size "0x0")
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endif()
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set(${STRING_STRING}
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"${${STRING_STRING}}\n ${symbol} ${expr} ${subalign} ${size} { }\n"
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PARENT_SCOPE
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)
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endfunction()
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include(${CMAKE_CURRENT_LIST_DIR}/../linker_script_common.cmake)

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