arch: add Kconfig for stack growth direction

This was previously just a #define in one header file, but we need
this expressed in Kconfig space in case some feature only works
properly with downward-growing stacks.

Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
This commit is contained in:
Andrew Boie 2018-03-06 13:17:57 -08:00 committed by Andrew Boie
commit a967915e52
2 changed files with 8 additions and 1 deletions

View file

@ -88,6 +88,13 @@ config PRIVILEGED_STACK_SIZE
this region will be inaccessible from user mode. During system calls,
this region will be utilized by the system call.
config STACK_GROWS_UP
bool "Stack grows towards higher memory addresses"
default n
help
Select this option if the architecture has upward growing thread
stacks. This is not common.
config MAX_THREAD_BYTES
int "Bytes to use when tracking object thread permissions"
default 2

View file

@ -33,7 +33,7 @@ static inline size_t stack_unused_space_get(const char *stack, size_t size)
* (or configurable direction) is added this check should be confirmed
* that correct Kconfig option is used.
*/
#if defined(STACK_GROWS_UP)
#if defined(CONFIG_STACK_GROWS_UP)
for (i = size - 1; i >= 0; i--) {
if ((unsigned char)stack[i] == 0xaa) {
unused++;