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arch: arm: thread built-in stack guard implementation

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This commit activates the built-in stack guard on the main_thread
before jumping to it upon system initialization. Stack guard is
activated if BUILTIN_STACK_GUARD is enabled by the user. The
commit also activates built-in thread stack guards at every
context switch, if BUILTIN_STACK_GUARD enabled by the user.

Signed-off-by: Ioannis Glaropoulos <Ioannis.Glaropoulos@nordicsemi.no>
This commit is contained in:
Ioannis Glaropoulos 2018-03-11 22:29:25 +01:00 • committed by Anas Nashif
commit 8d1b013f3c
4 changed files with 44 additions and 0 deletions
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8
arch/arm/core/swap_helper.S
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@ -175,6 +175,14 @@ _thread_irq_disabled:
pop {r2, lr}
#endif /* CONFIG_MPU_STACK_GUARD */
#ifdef CONFIG_BUILTIN_STACK_GUARD
/* r2 contains k_thread */
add r0, r2, #0
push {r2, lr}
blx configure_builtin_stack_guard
pop {r2, lr}
#endif /* CONFIG_BUILTIN_STACK_GUARD */
#ifdef CONFIG_USERSPACE
/* restore mode */
ldr r0, [r2, #_thread_offset_to_mode]