Help¶

This helper symbol specifies the default target instruction set for the assembler.

When only the Thumb-2 ISA is supported (i.e. on Cortex-M cores), the assembler must use the Thumb-2 instruction set.

When both the Thumb-2 and ARM ISAs are supported (i.e. on Cortex-A and Cortex-R cores), the assembler must use the ARM instruction set because the architecture assembly code makes use of the ARM instructions.

Direct dependencies¶

!ISA_ARM && !ARM64 && ARM

(Includes any dependencies from ifs and menus.)

Default¶

y if ISA_THUMB2 && !ISA_ARM

Kconfig definition¶

At <Zephyr>/arch/arm/core/aarch32/Kconfig:76

Included via <Zephyr>/Kconfig:8 → <Zephyr>/Kconfig.zephyr:29 → <Zephyr>/arch/Kconfig:12 → <Zephyr>/arch/arm/Kconfig:42

Menu path: (Top) → ARM Options

config ASSEMBLER_ISA_THUMB2
    bool
    default y if ISA_THUMB2 && !ISA_ARM
    depends on !ISA_ARM && !ARM64 && ARM
    help
      This helper symbol specifies the default target instruction set for
      the assembler.

      When only the Thumb-2 ISA is supported (i.e. on Cortex-M cores), the
      assembler must use the Thumb-2 instruction set.

      When both the Thumb-2 and ARM ISAs are supported (i.e. on Cortex-A
      and Cortex-R cores), the assembler must use the ARM instruction set
      because the architecture assembly code makes use of the ARM
      instructions.

(The ‘depends on’ condition includes propagated dependencies from ifs and menus.)