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debug: add stack sentinel feature

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This places a sentinel value at the lowest 4 bytes of a stack
memory region and checks it at various intervals, including when
servicing interrupts or context switching.

This is implemented on all arches except ARC, which supports stack
bounds checking directly in hardware.

Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
This commit is contained in:
Andrew Boie 2017-05-11 13:29:15 -07:00 • committed by Anas Nashif
commit 5dcb279df8
19 changed files with 162 additions and 19 deletions
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11
arch/arm/core/exc_exit.S
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@ -103,4 +103,15 @@ _ExcExitWithGdbStub:
_EXIT_EXC:
#endif /* CONFIG_PREEMPT_ENABLED */
#ifdef CONFIG_STACK_SENTINEL
push {lr}
bl _check_stack_sentinel
#if defined(CONFIG_ARMV6_M)
pop {r0}
mov lr, r0
#else
pop {lr}
#endif /* CONFIG_ARMV6_M */
#endif /* CONFIG_STACK_SENTINEL */
bx lr