ce3f07954a
Consistently place C++ use of extern "C" after all include directives, within the negative branch of _ASMLANGUAGE if used. In arch.h the extern "C" in the including context is left active during include of target-specific mpu headers to avoid more complex restructuring. Background from issue #17997: Declarations that use C linkage should be placed within extern "C" so the language linkage is correct when the header is included by a C++ compiler. Similarly #include directives should be outside the extern "C" to ensure the language-specific default linkage is applied to any declarations provided by the included header. See: https://en.cppreference.com/w/cpp/language/language_linkage Signed-off-by: Peter Bigot <peter.bigot@nordicsemi.no>
73 lines
1.6 KiB
C
73 lines
1.6 KiB
C
/*
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* Copyright (c) 2013-2014 Wind River Systems, Inc.
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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/**
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* @file
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* @brief Stack helpers for Cortex-M CPUs
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*
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* Stack helper functions.
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*/
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#ifndef ZEPHYR_ARCH_ARM_INCLUDE_CORTEX_M_STACK_H_
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#define ZEPHYR_ARCH_ARM_INCLUDE_CORTEX_M_STACK_H_
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#ifdef _ASMLANGUAGE
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/* nothing */
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#else
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#include <arch/arm/cortex_m/cmsis.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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extern K_THREAD_STACK_DEFINE(_interrupt_stack, CONFIG_ISR_STACK_SIZE);
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/**
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*
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* @brief Setup interrupt stack
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*
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* On Cortex-M, the interrupt stack is registered in the MSP (main stack
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* pointer) register, and switched to automatically when taking an exception.
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*
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* @return N/A
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*/
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static ALWAYS_INLINE void z_InterruptStackSetup(void)
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{
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u32_t msp = (u32_t)(Z_THREAD_STACK_BUFFER(_interrupt_stack)) +
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K_THREAD_STACK_SIZEOF(_interrupt_stack);
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__set_MSP(msp);
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#if defined(CONFIG_BUILTIN_STACK_GUARD)
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#if defined(CONFIG_CPU_CORTEX_M_HAS_SPLIM)
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__set_MSPLIM((u32_t)_interrupt_stack);
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#else
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#error "Built-in MSP limit checks not supported by HW"
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#endif
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#endif /* CONFIG_BUILTIN_STACK_GUARD */
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#if defined(CONFIG_STACK_ALIGN_DOUBLE_WORD)
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/* Enforce double-word stack alignment on exception entry
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* for Cortex-M3 and Cortex-M4 (ARMv7-M) MCUs. For the rest
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* of ARM Cortex-M processors this setting is enforced by
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* default and it is not configurable.
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*/
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#if defined(CONFIG_CPU_CORTEX_M3) || defined(CONFIG_CPU_CORTEX_M4)
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SCB->CCR |= SCB_CCR_STKALIGN_Msk;
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#endif
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#endif /* CONFIG_STACK_ALIGN_DOUBLE_WORD */
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}
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#ifdef __cplusplus
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}
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#endif
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#endif /* _ASMLANGUAGE */
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#endif /* ZEPHYR_ARCH_ARM_INCLUDE_CORTEX_M_STACK_H_ */
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