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cmake/linker_script: Fix cmake linker scripts to define _end

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The generated scripts don't include a definition for any symbol indicating
the end of statically allocated memory (such as "_end"). Add a shared cmake
fragment, ram-end.cmake, which contains the necessary instructions to
define _end and z_mapped_end consistently to align with the other sample
linker scripts.

Signed-off-by: Keith Packard <keithp@keithp.com>
This commit is contained in:
Keith Packard 2023-05-09 22:09:57 -07:00 • committed by Fabio Baltieri
commit bbec614b78
2 changed files with 9 additions and 0 deletions
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2
cmake/linker_script/arm/linker.cmake
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@ -135,6 +135,8 @@ if(NOT CONFIG_USERSPACE)
zephyr_linker_section_configure(SECTION .noinit INPUT ".kernel_noinit.*") zephyr_linker_section_configure(SECTION .noinit INPUT ".kernel_noinit.*")
endif() endif()
include(${COMMON_ZEPHYR_LINKER_DIR}/ram-end.cmake)
zephyr_linker_symbol(OBJECT REGION_RAM SYMBOL __kernel_ram_start EXPR "(@__bss_start@)") zephyr_linker_symbol(OBJECT REGION_RAM SYMBOL __kernel_ram_start EXPR "(@__bss_start@)")
zephyr_linker_symbol(OBJECT REGION_RAM SYMBOL __kernel_ram_end EXPR "(${RAM_ADDR} + ${RAM_SIZE})") zephyr_linker_symbol(OBJECT REGION_RAM SYMBOL __kernel_ram_end EXPR "(${RAM_ADDR} + ${RAM_SIZE})")
zephyr_linker_symbol(OBJECT REGION_RAM SYMBOL __kernel_ram_size EXPR "(@__kernel_ram_end@ - @__bss_start@)") zephyr_linker_symbol(OBJECT REGION_RAM SYMBOL __kernel_ram_size EXPR "(@__kernel_ram_end@ - @__bss_start@)")

7
cmake/linker_script/common/ram-end.cmake Normal file
View file

@ -0,0 +1,7 @@
zephyr_linker_section(NAME .last_ram_section VMA RAM LMA RAM_REGION TYPE BSS)
zephyr_linker_section_configure(
SECTION .last_ram_section
INPUT ""
SYMBOLS _end z_mapped_end
KEEP
)