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arch: arm: arm-v8 a/r: move bss/noinit sections to the end of linker script #79502

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May 1, 2025
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arch: arm: arm-v8 a/r: move bss/noinit sections to the end of linker script #79502

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79 changes: 39 additions & 40 deletions include/zephyr/arch/arm/cortex_a_r/scripts/linker.ld
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Original file line number Diff line number Diff line change
Expand Up @@ -285,36 +285,9 @@ SECTIONS
_app_smem_rom_start = LOADADDR(_APP_SMEM_SECTION_NAME);
#endif /* CONFIG_USERSPACE */

SECTION_DATA_PROLOGUE(_BSS_SECTION_NAME,(NOLOAD), BSS_ALIGN)
{
/*
* For performance, BSS section is assumed to be 4 byte aligned and
* a multiple of 4 bytes
*/
. = ALIGN(4);
__bss_start = .;
__kernel_ram_start = .;

*(.bss)
*(".bss.*")
*(COMMON)
*(".kernel_bss.*")

#ifdef CONFIG_CODE_DATA_RELOCATION
#include <linker_sram_bss_relocate.ld>
#endif

/*
* As memory is cleared in words only, it is simpler to ensure the BSS
* section ends on a 4 byte boundary. This wastes a maximum of 3 bytes.
*/
__bss_end = ALIGN(4);
} GROUP_DATA_LINK_IN(RAMABLE_REGION, RAMABLE_REGION)

#include <zephyr/linker/common-noinit.ld>

SECTION_DATA_PROLOGUE(_DATA_SECTION_NAME,,)
{
__kernel_ram_start = .;
__data_region_start = .;
__data_start = .;
*(.data)
Expand Down Expand Up @@ -348,12 +321,6 @@ SECTIONS

__data_region_end = .;


/* Define linker symbols */

__kernel_ram_end = RAM_ADDR + RAM_SIZE;
__kernel_ram_size = __kernel_ram_end - __kernel_ram_start;

#if DT_NODE_HAS_STATUS(DT_CHOSEN(zephyr_ocm), okay)
GROUP_START(OCM)

Expand Down Expand Up @@ -385,12 +352,6 @@ GROUP_END(OCM)
*/
#include <snippets-sections.ld>

#define LAST_RAM_ALIGN . = ALIGN(_region_min_align);

#include <zephyr/linker/ram-end.ld>

GROUP_END(RAMABLE_REGION)

#include <zephyr/linker/debug-sections.ld>

SECTION_PROLOGUE(.ARM.attributes, 0,)
Expand All @@ -416,4 +377,42 @@ GROUP_END(OCM)
* calculate this value here. */
_flash_used = LOADADDR(.last_section) + SIZEOF(.last_section) - __rom_region_start;

SECTION_DATA_PROLOGUE(_BSS_SECTION_NAME,(NOLOAD), BSS_ALIGN)
{
/*
* For performance, BSS section is assumed to be 4 byte aligned and
* a multiple of 4 bytes
*/
. = ALIGN(4);
__bss_start = .;

*(.bss)
*(".bss.*")
*(COMMON)
*(".kernel_bss.*")

#ifdef CONFIG_CODE_DATA_RELOCATION
#include <linker_sram_bss_relocate.ld>
#endif

/*
* As memory is cleared in words only, it is simpler to ensure the BSS
* section ends on a 4 byte boundary. This wastes a maximum of 3 bytes.
*/
__bss_end = ALIGN(4);
} GROUP_DATA_LINK_IN(RAMABLE_REGION, RAMABLE_REGION)

#include <zephyr/linker/common-noinit.ld>

/* Define linker symbols */

__kernel_ram_end = RAM_ADDR + RAM_SIZE;
__kernel_ram_size = __kernel_ram_end - __kernel_ram_start;

#define LAST_RAM_ALIGN . = ALIGN(_region_min_align);

#include <zephyr/linker/ram-end.ld>

GROUP_END(RAMABLE_REGION)

}