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arch: arm: allocate a wide priv stack guard for FP-capable threads
When an FP capable thread (i.e. with K_FP_REGS option) transitions into user mode, we want to allocate a wider MPU stack guard region, to be able to successfully detect overflows of the privilege stack during system calls. For that we also need to re-adjust the .priv_stack_start pointer, which denotes the start of the writable area of the privilege stack buffer. Signed-off-by: Ioannis Glaropoulos <Ioannis.Glaropoulos@nordicsemi.no>
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