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arc: implement stack checking

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ARC CPU has stack checking feature that allows to trigger an exception
whenever the stack is incorrectly accessed.
This patch implements the stack_top and stack_base register updates on
context switches, and activates the Stack Checking bit of STATUS32
register when the CPU is in the context of a fiber or task.
As GCC accesses the non-yet allocated stack with frame pointer enabled,
this patch also add the omit-frame-pointer gcc flag in order to work
properly.

Change-Id: Ia9e224085a03bd29d682fb8f51f8e712f2ccb556
Signed-off-by: Alexandre d'Alton <alexandre.dalton@intel.com>
This commit is contained in:
Alexandre d'Alton 2016-03-11 18:29:14 +01:00 • committed by Anas Nashif
commit f91e55b798
9 changed files with 77 additions and 5 deletions
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6
arch/arc/core/thread.c
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@ -131,8 +131,12 @@ void _new_thread(char *pStackMem, unsigned stackSize, _thread_entry_t pEntry,
* enable the interrupts based on intlock_key
* value.
*/
#ifdef CONFIG_ARC_STACK_CHECKING
pInitCtx->status32 = _ARC_V2_STATUS32_SC | _ARC_V2_STATUS32_E(_ARC_V2_DEF_IRQ_LEVEL);
tcs->stack_top = (uint32_t) stackEnd;
#else
pInitCtx->status32 = _ARC_V2_STATUS32_E(_ARC_V2_DEF_IRQ_LEVEL);
#endif
tcs->link = NULL;
tcs->flags = priority == -1 ? TASK | PREEMPTIBLE : FIBER;
tcs->prio = priority;