+#if !defined(LANGUAGE_ASSEMBLY)
+#include <thread.h>
+#ifdef LISP_FEATURE_STACK_GROWS_DOWNWARD_NOT_UPWARD
+
+#define CONTROL_STACK_HARD_GUARD_PAGE(th) \
+ ((os_vm_address_t)(th->control_stack_start))
+#define CONTROL_STACK_GUARD_PAGE(th) \
+ (CONTROL_STACK_HARD_GUARD_PAGE(th) + os_vm_page_size)
+#define CONTROL_STACK_RETURN_GUARD_PAGE(th) \
+ (CONTROL_STACK_GUARD_PAGE(th) + os_vm_page_size)
+
+#define ALIEN_STACK_HARD_GUARD_PAGE(th) \
+ ((os_vm_address_t)(th->alien_stack_start))
+#define ALIEN_STACK_GUARD_PAGE(th) \
+ (ALIEN_STACK_HARD_GUARD_PAGE(th) + os_vm_page_size)
+#define ALIEN_STACK_RETURN_GUARD_PAGE(th) \
+ (ALIEN_STACK_GUARD_PAGE(th) + os_vm_page_size)
+
+#else
+
+#define CONTROL_STACK_HARD_GUARD_PAGE(th) \
+ (((os_vm_address_t)(th->control_stack_end)) - os_vm_page_size)
+#define CONTROL_STACK_GUARD_PAGE(th) \
+ (CONTROL_STACK_HARD_GUARD_PAGE(th) - os_vm_page_size)
+#define CONTROL_STACK_RETURN_GUARD_PAGE(th) \
+ (CONTROL_STACK_GUARD_PAGE(th) - os_vm_page_size)
+
+#define ALIEN_STACK_HARD_GUARD_PAGE(th) \
+ (((os_vm_address_t)th->alien_stack_start) + ALIEN_STACK_SIZE - \
+ os_vm_page_size)
+#define ALIEN_STACK_GUARD_PAGE(th) \
+ (ALIEN_STACK_HARD_GUARD_PAGE(th) - os_vm_page_size)
+#define ALIEN_STACK_RETURN_GUARD_PAGE(th) \
+ (ALIEN_STACK_GUARD_PAGE(th) - os_vm_page_size)
+