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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
kernel/include/kernel_structs.h
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@ -45,6 +45,10 @@
/* end - states */
#ifdef CONFIG_STACK_SENTINEL
/* Magic value in lowest bytes of the stack */
#define STACK_SENTINEL 0xF0F0F0F0
#endif
/* lowest value of _thread_base.preempt at which a thread is non-preemptible */
#define _NON_PREEMPT_THRESHOLD 0x0080
@ -154,6 +158,13 @@ static ALWAYS_INLINE void _new_thread_init(struct k_thread *thread,
#ifdef CONFIG_INIT_STACKS
memset(pStack, 0xaa, stackSize);
#endif
#ifdef CONFIG_STACK_SENTINEL
/* Put the stack sentinel at the lowest 4 bytes of the stack area.
* We periodically check that it's still present and kill the thread
* if it isn't.
*/
*((u32_t *)pStack) = STACK_SENTINEL;
#endif /* CONFIG_STACK_SENTINEL */
/* Initialize various struct k_thread members */
_init_thread_base(&thread->base, prio, _THREAD_PRESTART, options);