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toolchain: Add assembly-side counterpart of __aligned

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Zephyr toolchain abstraction provides a macro __aligned(x) to add specified
alignment, in bytes, to a chosen symbol for C/C++ source files but there is
no portable counterpart available for symbols defined in assembly source
files. This change-set adds a new macro ALIGN(x) for this purpose.

Signed-off-by: Irfan Ahmad <irfan.ahmad@siemens.com>
This commit is contained in:
Irfan Ahmad 2025-02-14 04:28:05 +05:00 committed by Benjamin Cabé
parent 4342d7108b
commit 58d5e35f0d
1 changed files with 32 additions and 0 deletions
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32
include/zephyr/toolchain/common.h
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@ -1,5 +1,6 @@
/*
* Copyright (c) 2010-2014 Wind River Systems, Inc.
* Copyright (c) 2025 Siemens AG
*
* SPDX-License-Identifier: Apache-2.0
*/
@ -60,6 +61,37 @@
#define SECTION .section
#endif
/*
* General directive for assembly code, to align the following symbol, in bytes.
*
* Example:
*
* ALIGN(4)
* test_symbol:
*
* 'test_symbol' will get aligned to 4 bytes.
*/
#if defined(_ASMLANGUAGE) && !defined(_LINKER)
#if defined(CONFIG_X86) || defined(CONFIG_ARM) || defined(CONFIG_ARM64) || \
defined(CONFIG_NIOS2) || defined(CONFIG_RISCV) || \
defined(CONFIG_XTENSA) || defined(CONFIG_MIPS) || \
defined(CONFIG_ARCH_POSIX)
#define ALIGN(x) .balign x
#elif defined(CONFIG_ARC)
/* .align assembler directive is supported by all ARC toolchains and it is
* implemented in the same way across ARC toolchains.
*/
#define ALIGN(x) .align x
#elif defined(CONFIG_SPARC)
#define ALIGN(x) .align x
#else
#error Architecture unsupported
#endif
#endif /* defined(_ASMLANGUAGE) && !defined(_LINKER) */
/*
* If the project is being built for speed (i.e. not for minimum size) then
* align functions and branches in executable sections to improve performance.