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linker generator: Handle .last_section

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Add  cmake linker generator things for .last_section.

Follow up to #88970. Fixes bug #89719, for gcc/ld & iar

Signed-off-by: Björn Bergman <bjorn.bergman@iar.com>
This commit is contained in:
Björn Bergman 2025-05-09 15:41:44 +02:00 • committed by Benjamin Cabé
commit 01d3316810
4 changed files with 126 additions and 121 deletions
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13
cmake/linker_script/arm/linker.cmake
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@ -155,7 +155,7 @@ if(CONFIG_USERSPACE)
zephyr_linker_symbol(SYMBOL "_app_smem_rom_start" EXPR "@__app_smem_group_load_start@")
zephyr_linker_section(NAME .bss VMA RAM LMA FLASH TYPE BSS)
zephyr_linker_section(NAME .bss GROUP RAM_REGION TYPE BSS)
zephyr_linker_section_configure(SECTION .bss INPUT COMMON)
zephyr_linker_section_configure(SECTION .bss INPUT ".kernel_bss.*")
@ -175,7 +175,7 @@ include(${COMMON_ZEPHYR_LINKER_DIR}/common-ram.cmake)
include(${COMMON_ZEPHYR_LINKER_DIR}/kobject-data.cmake)
if(NOT CONFIG_USERSPACE)
zephyr_linker_section(NAME .bss VMA RAM LMA FLASH TYPE BSS)
zephyr_linker_section(NAME .bss GROUP RAM_REGION TYPE BSS)
zephyr_linker_section_configure(SECTION .bss INPUT COMMON)
zephyr_linker_section_configure(SECTION .bss INPUT ".kernel_bss.*")
# As memory is cleared in words only, it is simpler to ensure the BSS
@ -256,3 +256,12 @@ dt_comp_path(paths COMPATIBLE "zephyr,memory-region")
foreach(path IN LISTS paths)
zephyr_linker_dts_section(PATH ${path})
endforeach()
# .last_section must be last in romable region
# .last_section contains a fixed word to ensure location counter and actual
# rom region data usage match when CONFIG_LINKER_LAST_SECTION_ID=y.
zephyr_linker_section(NAME .last_section VMA FLASH LMA FLASH
NOINPUT TYPE LINKER_SCRIPT_FOOTER)
# KEEP can not be passed to zephyr_linker_section, so:
zephyr_linker_section_configure(SECTION .last_section INPUT ".last_section" KEEP)