uC-OS3
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ARMv7-M port
https://github.com/weston-embedded/uC-OS3/blob/7af6c6e8aff1c75caf008fcc266b759528199eb2/Ports/ARM-Cortex-M/ARMv7-M/GNU/os_cpu_a.S#L158-L160
Must be:
.thumb_func
OSCtxSw:
.thumb_func
OSIntCtxSw: