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-mexecute-only
Generates execute-only code, and prevents the compiler from generating any data accesses to code sections.
To keep code and data in separate sections, the compiler disables literal
pools and branch tables when using the -mexecute-only
option.
Restrictions
Execute-only code must be T32 code.
Execute-only code is only supported for:
- Processors that support the Armv8‑M architecture, with or without the Main Extension.
- Processors that support the Armv7‑M architecture, such as the Cortex®-M3.
If your application calls library functions, the library objects included in the image are not execute-only compliant. You must ensure these objects are not assigned to an execute-only memory region.
Note
Arm does not provide libraries that are built without literal pools. The libraries still use literal pools, even when you use the-mexecute-only
option.Note
Link Time Optimization does not honor thearmclang -mexecute-only
option. If you use the armclang -flto
or -Omax
options, then the compiler cannot generate execute-only code and produces a warning.