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arch: arm: cortex_m: Consolidate bss/noinit sections for kernel/user mode #83721

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Merged
merged 1 commit into from
Feb 6, 2025
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arch: arm: cortex_m: Consolidate bss/noinit sections for kernel/user mode #83721

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50 changes: 2 additions & 48 deletions include/zephyr/arch/arm/cortex_m/scripts/linker.ld
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Original file line number Diff line number Diff line change
Expand Up @@ -277,35 +277,6 @@ SECTIONS

_app_smem_size = _app_smem_end - _app_smem_start;
_app_smem_rom_start = LOADADDR(_APP_SMEM_SECTION_NAME);

SECTION_DATA_PROLOGUE(_BSS_SECTION_NAME,(NOLOAD),)
{
/*
* 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>

#endif /* CONFIG_USERSPACE */

GROUP_START(DATA_REGION)
Expand Down Expand Up @@ -449,8 +420,7 @@ SECTION_PROLOGUE(.last_section,,)
* calculate this value here. */
_flash_used = LOADADDR(.last_section) + SIZEOF(.last_section) - __rom_region_start;

#ifndef CONFIG_USERSPACE
SECTION_DATA_PROLOGUE(_BSS_SECTION_NAME,(NOLOAD),)
SECTION_DATA_PROLOGUE(_BSS_SECTION_NAME,(NOLOAD),)
{
/*
* For performance, BSS section is assumed to be 4 byte aligned and
Expand All @@ -476,23 +446,7 @@ _flash_used = LOADADDR(.last_section) + SIZEOF(.last_section) - __rom_region_sta
__bss_end = ALIGN(4);
} GROUP_DATA_LINK_IN(RAMABLE_REGION, RAMABLE_REGION)

SECTION_PROLOGUE(_NOINIT_SECTION_NAME,(NOLOAD),)
{
/*
* This section is used for non-initialized objects that
* will not be cleared during the boot process.
*/
*(.noinit)
*(".noinit.*")
*(".kernel_noinit.*")

/* Located in generated directory. This file is populated by the
* zephyr_linker_sources() Cmake function.
*/
#include <snippets-noinit.ld>

} GROUP_NOLOAD_LINK_IN(RAMABLE_REGION, RAMABLE_REGION)
#endif /* CONFIG_USERSPACE */
#include <zephyr/linker/common-noinit.ld>

/* Define linker symbols */

Expand Down
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