toolchain: Add assembly-side counterpart of __aligned

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 BALIGN(x) for this purpose. Signed-off-by: Irfan Ahmad <[email protected]>
zephyrproject-rtos · Feb 13, 2025 · 1d5070c · 1d5070c
1 parent 0c368e8
commit 1d5070c
Showing 1 changed file with 32 additions and 0 deletions.
diff --git a/include/zephyr/toolchain/common.h b/include/zephyr/toolchain/common.h
@@ -1,5 +1,6 @@
 /*
  * Copyright (c) 2010-2014 Wind River Systems, Inc.
+ * Copyright (c) 2025 Siemens AG
  *
  * SPDX-License-Identifier: Apache-2.0
  */
@@ -106,6 +107,37 @@
 
 #endif /* _ASMLANGUAGE */
 
+/*
+ * General directive for assembly code, to align the following symbol, in bytes.
+ *
+ * Example:
+ *
+ *    BALIGN(4)
+ *    test_symbol:
+ *
+ * 'test_symbol' will get aligned to 4 bytes.
+ */
+
+#ifdef _ASMLANGUAGE
+
+  #if defined(CONFIG_X86) || defined(CONFIG_ARM) || defined(CONFIG_ARM64) || \
+	defined(CONFIG_NIOS2) || defined(CONFIG_RISCV) || \
+	defined(CONFIG_XTENSA) || defined(CONFIG_MIPS)
+
+    #define   BALIGN(x)   .balign   x
+
+  #elif defined(CONFIG_ARC) || defined(CONFIG_SPARC)
+
+    #define   BALIGN(x)   .align    x
+
+  #else
+
+    #error Architecture unsupported
+
+  #endif
+
+#endif /* _ASMLANGUAGE */
+
 /* force inlining a function */
 
 #if !defined(_ASMLANGUAGE)