CONFIG_ARM_THUMB: Support Thumb user binaries

General informations

The Linux kernel configuration item CONFIG_ARM_THUMB has multiple definitions:

Support Thumb user binaries found in arch/arm/mm/Kconfig

The configuration item CONFIG_ARM_THUMB:

• prompt: Support Thumb user binaries
• type: bool
• depends on: (! CONFIG_CPU_THUMBONLY && CONFIG_EXPERT ) && ( CONFIG_CPU_THUMB_CAPABLE && ! CONFIG_CPU_32v4 )
• defined in arch/arm/mm/Kconfig
• found in Linux kernels: 2.6.0–2.6.39, 3.0–3.19, 4.0–4.20, 5.0–5.19, 6.0–6.12, 6.13-rc+HEAD

Help text

Say Y if you want to include kernel support for running user space Thumb binaries.

The Thumb instruction set is a compressed form of the standard ARM instruction set resulting in smaller binaries at the expense of slightly less efficient code.

If this option is disabled, and you run userspace that switches to Thumb mode, signal handling will not work correctly, resulting in segmentation faults or illegal instruction aborts.

If you don't know what this all is, saying Y is a safe choice.

Support Thumb instructions (EXPERIMENTAL) found in arch/arm/Kconfig

The configuration item CONFIG_ARM_THUMB:

• prompt: Support Thumb instructions (EXPERIMENTAL)
• type: bool
• depends on: ( CONFIG_CPU_ARM720T || CONFIG_CPU_ARM920T || CONFIG_CPU_ARM922T || CONFIG_CPU_ARM926T || CONFIG_CPU_ARM1020 || CONFIG_CPU_XSCALE ) && CONFIG_EXPERIMENTAL
• defined in arch/arm/Kconfig
• found in Linux kernels: 2.5.45–2.5.75

Help text

Say Y if you want to have kernel support for ARM Thumb instructions, fault handlers, and system calls.

The Thumb instruction set is a compressed form of the standard ARM instruction set resulting in smaller binaries at the expense of slightly less efficient code.

If you don't know what this all is, saying Y is a safe choice.

Hardware

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The data is retrived from:

• Linux kernel
• Linux Kernel Driver DataBase (LKDDb)

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