altos: Declare task stack as union of uint8_t and uint32_t

[fw/altos] / src / stm32f4 / ao_arch_funcs.h

diff --git a/src/stm32f4/ao_arch_funcs.h b/src/stm32f4/ao_arch_funcs.h
index b1ffb5b6bc2378a6e00475a6d94fd9aa142b235b..8ff31b4a917620865d3c368b1756cb934edaf1b5 100644 (file)
--- a/src/stm32f4/ao_arch_funcs.h
+++ b/src/stm32f4/ao_arch_funcs.h
@@ -84,7 +84,7 @@ ao_arch_irq_check(void) {
 static inline void
 ao_arch_init_stack(struct ao_task *task, void *start)
 {
-       uint32_t        *sp = (uint32_t *) ((void*) task->stack + AO_STACK_SIZE);
+       uint32_t        *sp = &task->stack32[AO_STACK_SIZE>>2];
        uint32_t        a = (uint32_t) start;
        int             i;
 
@@ -110,7 +110,7 @@ ao_arch_init_stack(struct ao_task *task, void *start)
        /* BASEPRI with interrupts enabled */
        ARM_PUSH32(sp, 0);
 
-       task->sp = sp;
+       task->sp32 = sp;
 }
 
 static inline void ao_arch_save_regs(void) {
@@ -142,12 +142,12 @@ static inline void ao_arch_save_regs(void) {
 static inline void ao_arch_save_stack(void) {
        uint32_t        *sp;
        asm("mov %0,sp" : "=&r" (sp) );
-       ao_cur_task->sp = (sp);
+       ao_cur_task->sp32 = (sp);
 }
 
 static inline void ao_arch_restore_stack(void) {
        /* Switch stacks */
-       asm("mov sp, %0" : : "r" (ao_cur_task->sp) );
+       asm("mov sp, %0" : : "r" (ao_cur_task->sp32) );
 
 #ifdef AO_NONMASK_INTERRUPTS
        /* Restore BASEPRI */