460b6ef122
When using the code and data relocation feature, every relocated symbol would be marked with `KEEP()` in the generated linker script. Therefore, if any input files contained unused code, then it wouldn't be discarded by the linker, even when invoked with `--gc-sections`. This can cause unexpected bloat, or other link-time issues stemming from some symbols being discarded and others not. On the other hand, this behavior has been present since the feature's introduction, so it should remain default for the users who rely on it. This patch introduces support for `zephyr_code_relocate(... NOKEEP)`. This will suppress the generation of `KEEP()` statements for all symbols in a particular library or set of files. Much like `NOCOPY`, the `NOKEEP` flag is passed to `gen_relocate_app.py` in string form. The script is now equipped to handle multiple such flags when passed from CMake as a semicolon-separated list, like so: "SRAM2:NOCOPY;NOKEEP:/path/to/file1.c;/path/to/file2.c" Documentation and tests are updated here as well. Signed-off-by: Grzegorz Swiderski <grzegorz.swiderski@nordicsemi.no>
49 lines
1.8 KiB
CMake
49 lines
1.8 KiB
CMake
# SPDX-License-Identifier: Apache-2.0
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# Copyright 2022 NXP
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cmake_minimum_required(VERSION 3.20.0)
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find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
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project(code_relocation)
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FILE(GLOB app_sources src/*.c)
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target_sources(app PRIVATE ${app_sources})
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if (CONFIG_BOARD_QEMU_XTENSA)
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set(RAM_PHDR PHDR sram0_phdr)
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set(SRAM2_PHDR PHDR sram2_phdr)
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endif()
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# Code relocation feature
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zephyr_code_relocate(FILES src/test_file1.c ${SRAM2_PHDR} LOCATION SRAM2)
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zephyr_code_relocate(FILES ${CMAKE_CURRENT_SOURCE_DIR}/src/test_file2.c ${RAM_PHDR} LOCATION RAM)
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# Add custom library that we can relocate code for
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add_subdirectory(test_lib)
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target_link_libraries(app PUBLIC test_lib)
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target_include_directories(app PUBLIC ${CMAKE_CURRENT_LIST_DIR}/test_lib)
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# Relocate library code
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zephyr_code_relocate(LIBRARY test_lib LOCATION SRAM2)
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# Test support for a simple generator expression to relocate two files
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set(reloc_files src/test_file4.c src/test_file5.c)
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set(genex_expr
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${CMAKE_CURRENT_LIST_DIR}/$<JOIN:${reloc_files},$<SEMICOLON>${CMAKE_CURRENT_LIST_DIR}/>)
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zephyr_code_relocate(FILES ${genex_expr} LOCATION SRAM2)
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zephyr_code_relocate(FILES src/test_file3.c LOCATION SRAM2_LITERAL)
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zephyr_code_relocate(FILES src/test_file3.c LOCATION SRAM2_TEXT)
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zephyr_code_relocate(FILES src/test_file3.c LOCATION RAM_DATA)
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zephyr_code_relocate(FILES src/test_file3.c LOCATION SRAM2_BSS)
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# Test NOKEEP support. Placing both KEEP and NOKEEP symbols in the same location
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# (this and test_file2.c in RAM) should work fine.
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zephyr_code_relocate(FILES ${ZEPHYR_BASE}/kernel/sem.c ${RAM_PHDR} LOCATION RAM NOKEEP)
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if (CONFIG_RELOCATE_TO_ITCM)
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zephyr_code_relocate(FILES ${ZEPHYR_BASE}/lib/libc/minimal/source/string/string.c
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LOCATION ITCM_TEXT)
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endif()
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zephyr_linker_sources(SECTIONS custom-sections.ld)
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