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kernel: add K_THREAD_STACK_RESERVED

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This is used to have each arch canonically state how much
room in the stack object is reserved for non-thread use.

Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
This commit is contained in:
Andrew Boie 2019-03-19 10:42:24 -07:00 • committed by Andrew Boie
commit 575abc0150
4 changed files with 36 additions and 8 deletions
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10
include/arch/arm/arch.h
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@ -120,6 +120,16 @@ extern "C" {
1 << (31 - __builtin_clz(x) + 1) : \
1 << (31 - __builtin_clz(x)))
#if defined(CONFIG_USERSPACE) && \
defined(CONFIG_MPU_REQUIRES_POWER_OF_TWO_ALIGNMENT)
/* Guard is 'carved-out' of the thread stack region, and the supervisor
* mode stack is allocated elsewhere by gen_priv_stack.py
*/
#define Z_ARCH_THREAD_STACK_RESERVED 0
#else
#define Z_ARCH_THREAD_STACK_RESERVED MPU_GUARD_ALIGN_AND_SIZE
#endif
#if defined(CONFIG_USERSPACE) && \
defined(CONFIG_MPU_REQUIRES_POWER_OF_TWO_ALIGNMENT)
#define Z_ARCH_THREAD_STACK_DEFINE(sym, size) \