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soc: nordic: Provide z_arm_platform_init at link time

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Nordic SoCs use this hook to execute `SystemInit` as early as possible
after ARM core reset. Previously, `z_arm_platform_init` was defined as
assembly code, which would simply jump to the other function.

However, this extra code can be avoided by using `SystemInit` directly
in place of the `z_arm_platform_init` symbol (whenever it's undefined).
This is now done with a linker script containing a `PROVIDE` directive.

This saves 4 bytes of ROM (0-16 depending on alignment) and also makes
it possible to override `z_arm_platform_init` out of tree, if needed.

Signed-off-by: Grzegorz Swiderski <grzegorz.swiderski@nordicsemi.no>
This commit is contained in:
Grzegorz Swiderski 2024-04-02 10:50:57 +02:00 • committed by Anas Nashif
commit 7d45f3c92a
5 changed files with 24 additions and 47 deletions
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6
soc/nordic/CMakeLists.txt
View file

@ -2,14 +2,12 @@
zephyr_library()
if(CONFIG_ARM)
set(SOC_LINKER_SCRIPT ${ZEPHYR_BASE}/include/zephyr/arch/arm/cortex_m/scripts/linker.ld CACHE INTERNAL "SoC Linker script")
set(SOC_LINKER_SCRIPT ${CMAKE_CURRENT_SOURCE_DIR}/linker.ld CACHE INTERNAL "SoC Linker script")
zephyr_library_sources(
zephyr_library_sources(
validate_base_addresses.c
validate_enabled_instances.c
)
endif()
if(CONFIG_SOC_HAS_TIMING_FUNCTIONS AND NOT CONFIG_BOARD_HAS_TIMING_FUNCTIONS)
if(CONFIG_TIMING_FUNCTIONS)

4
soc/nordic/common/CMakeLists.txt
View file

@ -3,10 +3,6 @@
add_subdirectory_ifdef(CONFIG_RISCV_CORE_NORDIC_VPR vpr)
if(CONFIG_ARM AND CONFIG_SOC_FAMILY_NORDIC_NRF)
zephyr_library_sources(soc_nrf_common.S)
endif()
zephyr_library_sources_ifdef(CONFIG_POWEROFF poweroff.c)
zephyr_include_directories(.)

34
soc/nordic/common/soc_nrf_common.S
View file

@ -1,34 +0,0 @@
/*
* Copyright (c) 2021 Nordic Semiconductor ASA
*
* SPDX-License-Identifier: Apache-2.0
*/
/**
* @file
* @brief System/hardware module for Nordic Semiconductor nRFxx family processors
*/
#include <zephyr/toolchain.h>
#include <zephyr/linker/sections.h>
_ASM_FILE_PROLOGUE
GTEXT(SystemInit)
GTEXT(z_arm_platform_init)
SECTION_FUNC(TEXT, z_arm_platform_init)
/* Implement z_arm_platform_init() directly in ASM,
* and ensure no stack access is performed until
* we jump to SystemInit().
*/
#if defined(CONFIG_ARMV6_M_ARMV8_M_BASELINE)
ldr r0, =SystemInit
bx r0
#elif defined(CONFIG_ARMV7_M_ARMV8_M_MAINLINE)
b SystemInit
#else
#error "Unsupported architecture"
#endif
/* Return occurs via SystemInit */

2
soc/nordic/common/vpr/CMakeLists.txt
View file

@ -4,5 +4,3 @@
zephyr_include_directories(.)
zephyr_library_sources(soc_idle.c soc_irq.S soc_irq.c vector.S)
set(SOC_LINKER_SCRIPT ${ZEPHYR_BASE}/include/zephyr/arch/riscv/common/linker.ld CACHE INTERNAL "")

19
soc/nordic/linker.ld Normal file
View file

@ -0,0 +1,19 @@
/*
* Copyright (c) 2024 Nordic Semiconductor ASA
*
* SPDX-License-Identifier: Apache-2.0
*/
#if defined(CONFIG_ARM)
#include <zephyr/arch/arm/cortex_m/scripts/linker.ld>
/* Let SystemInit() be called in place of z_arm_platform_init() by default. */
PROVIDE(z_arm_platform_init = SystemInit);
#elif defined(CONFIG_RISCV)
#include <zephyr/arch/riscv/common/linker.ld>
#else
#error Unsupported architecture
#endif