[Backport v4.1-branch] arch: arm: switch to privilege stack in SVC handler #96015
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Introduce a test to overwrite the return address in the exception stack frame of a lower-priority thread performing an SVC call. Signed-off-by: Sudan Landge <sudan.landge@arm.com> (cherry picked from commit f80bef3)
`west build` does not build the `empty_cpu0` application making `west build -b mps2/an521/cpu1 -t run` fail because of the missing empty_cpu0's binary. Signed-off-by: Sudan Landge <sudan.landge@arm.com> (cherry picked from commit 52151d0)
Initialize the privilege stack and switch PSP to it early in the SVC handler to ensure `z_arm_do_syscall` does not start on a user-accessible stack frame. Signed-off-by: Sudan Landge <sudan.landge@arm.com> (cherry picked from commit 319c697)
zephyrbot added platform: ARM zephyrbot requested review from MaureenHelm, bbolen, carlocaione, dcpleung, galak, ithinuel, microbuilder, nashif, stephanosio and wearyzen 
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ceolin approved these changes Sep 18, 2025
stephanosio approved these changes Sep 18, 2025
wearyzen approved these changes Oct 22, 2025
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Backport 319c697~3..319c697 from #95101.
Fixes #96172.