[Backport v4.2-branch] arch: arm: start threads on privileged stack #97306
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Use the privileged stack when starting K_USER threads in arch_new_thread(). Threads entering user mode with k_thread_user_mode_enter() keep their existing flow. To support both cases, z_arm_userspace_enter() now takes an internal ABI flag (sp_is_priv) indicating whether PSP already points to the privileged stack. Also fix calculation of the privileged stack top: use priv_stack_end directly instead of priv_stack_start + CONFIG_PRIVILEGED_STACK_SIZE, which failed to account for guard/FPU offsets applied to priv_stack_start. Signed-off-by: Sudan Landge <[email protected]> (cherry picked from commit 0438b9f)
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Backport 0438b9f from #96850.
Fixes #97304