cmake: Toolchain abstraction: Abstraction of binary tool, readelf.

This abstracts the interface for generation of the readelf command
line, by naming the desired actions instead of directly setting the
command parameters, which then opens up for other binary tool sets
which may require different arguments to achieve the desired result.

The intent here is to abstract Zephyr's dependence on toolchains,
thus allowing for easier porting to other, perhaps commercial,
toolchains and/or usecases.

No functional change expected.

Signed-off-by: Danny Oerndrup <daor@demant.com>

CMakeLists.txt

@@ -1356,14 +1356,23 @@ if(CONFIG_OUTPUT_DISASSEMBLY)
 endif()
 
 if(CONFIG_OUTPUT_STAT)
+  set(out_stat_cmd    "")
+  set(out_stat_byprod "")
+  bintools_readelf(
+    RESULT_CMD_LIST    out_stat_cmd
+    RESULT_BYPROD_LIST out_stat_byprod
+    HEADERS
+    FILE_INPUT         ${KERNEL_ELF_NAME}
+    FILE_OUTPUT        ${KERNEL_STAT_NAME}
+    )
   list(APPEND
     post_build_commands
-    COMMAND
-    ${CMAKE_READELF} -e ${KERNEL_ELF_NAME} > ${KERNEL_STAT_NAME}
+    ${out_stat_cmd}
     )
   list(APPEND
     post_build_byproducts
     ${KERNEL_STAT_NAME}
+    ${out_stat_byprod}
     )
 endif()
 

cmake/bintools/gnu/target.cmake

@@ -17,3 +17,4 @@ find_program(CMAKE_GDB     gdb-multiarch           PATH ${TOOLCHAIN_HOME}
 include(${ZEPHYR_BASE}/cmake/bintools/gnu/target_memusage.cmake)
 include(${ZEPHYR_BASE}/cmake/bintools/gnu/target_objcopy.cmake)
 include(${ZEPHYR_BASE}/cmake/bintools/gnu/target_objdump.cmake)
+include(${ZEPHYR_BASE}/cmake/bintools/gnu/target_readelf.cmake)

cmake/bintools/gnu/target_readelf.cmake

@@ -0,0 +1,60 @@
+# SPDX-License-Identifier: Apache-2.0
+
+# Construct a commandline suitable for calling the toolchain binary tools
+#  version of readelf.
+#
+#  Usage:
+#    bintools_readelf(
+#      RESULT_CMD_LIST    <List of commands to be executed, usually after build>
+#      RESULT_BYPROD_LIST <List of command output byproducts>
+#
+#      HEADERS            <Display all the headers in the input file>
+#
+#      FILE_INPUT         <The input file>
+#      FILE_OUTPUT        <The output file>
+#    )
+function(bintools_readelf)
+  cmake_parse_arguments(
+    # Prefix of output variables
+    BINTOOLS_READELF
+    # List of argument names without values, hence boolean
+    "HEADERS"
+    # List of argument names with one value
+    "RESULT_CMD_LIST;RESULT_BYPROD_LIST;FILE_INPUT;FILE_OUTPUT"
+    # List of argument names with multible values
+    ""
+    # Parser input
+    ${ARGN}
+  )
+
+  # Verify arguments
+  if(NOT DEFINED BINTOOLS_READELF_RESULT_CMD_LIST OR NOT DEFINED ${BINTOOLS_READELF_RESULT_CMD_LIST})
+    message(FATAL_ERROR "RESULT_CMD_LIST is required.")
+  elseif(NOT DEFINED BINTOOLS_READELF_FILE_INPUT)
+    message(FATAL_ERROR "FILE_INPUT is required.")
+  endif()
+
+  # Handle headers
+  set(readelf_headers "")
+  if(${BINTOOLS_READELF_HEADERS})
+    set(readelf_headers "-e") # --headers
+  endif()
+
+  # Handle output
+  set(readelf_output "")
+  if(DEFINED BINTOOLS_READELF_FILE_OUTPUT)
+    set(readelf_output > ${BINTOOLS_READELF_FILE_OUTPUT})
+  endif()
+
+  # Construct the command
+  set(readelf_cmd
+    # Base command
+    COMMAND ${CMAKE_READELF} ${readelf_headers}
+    # Input and Output
+    ${BINTOOLS_READELF_FILE_INPUT} ${readelf_output}
+  )
+
+  # Place command in the parent provided variable
+  set(${BINTOOLS_READELF_RESULT_CMD_LIST} ${readelf_cmd} PARENT_SCOPE)
+
+endfunction(bintools_readelf)

cmake/bintools/host-gnu/target.cmake

@@ -14,3 +14,4 @@ find_program(CMAKE_GDB     gdb    )
 include(${ZEPHYR_BASE}/cmake/bintools/gnu/target_memusage.cmake)
 include(${ZEPHYR_BASE}/cmake/bintools/gnu/target_objcopy.cmake)
 include(${ZEPHYR_BASE}/cmake/bintools/gnu/target_objdump.cmake)
+include(${ZEPHYR_BASE}/cmake/bintools/gnu/target_readelf.cmake)

cmake/bintools/llvm/target.cmake

@@ -18,3 +18,4 @@ find_program(CMAKE_READELF readelf      ${find_program_binutils_args})
 include(${ZEPHYR_BASE}/cmake/bintools/gnu/target_memusage.cmake)
 include(${ZEPHYR_BASE}/cmake/bintools/gnu/target_objcopy.cmake)
 include(${ZEPHYR_BASE}/cmake/bintools/gnu/target_objdump.cmake)
+include(${ZEPHYR_BASE}/cmake/bintools/gnu/target_readelf.cmake)