altos: Declare task stack as union of uint8_t and uint32_t

[fw/altos] / src / avr / ao_arch.h

diff --git a/src/avr/ao_arch.h b/src/avr/ao_arch.h
index 6166c50e67f489fddae53c10b1182349adad1e71..d3454f917fc6f75aa32d5879d2d3d9a4cf821198 100644 (file)
--- a/src/avr/ao_arch.h
+++ b/src/avr/ao_arch.h
@@ -78,27 +78,25 @@ extern uint8_t      ao_cpu_sleep_disable;
 
 #define ao_arch_task_globals   uint8_t ao_cpu_sleep_disable;
 
-#define ao_arch_task_members\
-       uint8_t *sp;                    /* saved stack pointer */
-
-#define ao_arch_init_stack(task, start) do {                   \
-       uint8_t         *sp = task->stack + AO_STACK_SIZE - 1;  \
-       uint16_t        a = (uint16_t) start;                   \
-       int             i;                                      \
-                                                               \
-       /* Return address */                                    \
-       AVR_PUSH8(sp, a);                                       \
-       AVR_PUSH8(sp, (a >> 8));                                \
-                                                               \
-       /* Clear register values */                             \
-       i = 32;                                                 \
-       while (i--)                                             \
-               AVR_PUSH8(sp, 0);                               \
-                                                               \
-       /* SREG with interrupts enabled */                      \
-       AVR_PUSH8(sp, 0x80);                                    \
-       task->sp = sp;                                          \
-} while (0);
+#define ao_arch_init_stack(task, start) \
+       do {                                                            \
+               uint8_t         *sp = task->stack8 + AO_STACK_SIZE - 1; \
+               uint16_t        a = (uint16_t) start;                   \
+               int             i;                                      \
+                                                                       \
+               /* Return address */                                    \
+               AVR_PUSH8(sp, a);                                       \
+               AVR_PUSH8(sp, (a >> 8));                                \
+                                                                       \
+               /* Clear register values */                             \
+               i = 32;                                                 \
+               while (i--)                                             \
+                       AVR_PUSH8(sp, 0);                               \
+                                                                       \
+               /* SREG with interrupts enabled */                      \
+               AVR_PUSH8(sp, 0x80);                                    \
+               task->sp8 = sp;                                         \
+       } while (0);
        
 #define ao_arch_save_regs() do {                                       \
                asm("push r31" "\n\t" "push r30");                      \
@@ -115,7 +113,7 @@ extern uint8_t      ao_cpu_sleep_disable;
                uint8_t sp_l, sp_h;                                     \
                asm("in %0,__SP_L__" : "=&r" (sp_l) );                  \
                asm("in %0,__SP_H__" : "=&r" (sp_h) );                  \
-               ao_cur_task->sp = (uint8_t *) ((uint16_t) sp_l | ((uint16_t) sp_h << 8)); \
+               ao_cur_task->sp8 = (uint8_t *) ((uint16_t) sp_l | ((uint16_t) sp_h << 8)); \
        } while (0)
 
 #define ao_arch_isr_stack()    /* nothing */
@@ -140,8 +138,8 @@ extern uint8_t      ao_cpu_sleep_disable;
 
 #define ao_arch_restore_stack() do { \
                uint8_t sp_l, sp_h;                                     \
-               sp_l = (uint16_t) ao_cur_task->sp;                      \
-               sp_h = ((uint16_t) ao_cur_task->sp) >> 8;               \
+               sp_l = (uint16_t) ao_cur_task->sp8;                     \
+               sp_h = ((uint16_t) ao_cur_task->sp8) >> 8;              \
                asm("out __SP_H__,%0" : : "r" (sp_h) );                 \
                asm("out __SP_L__,%0" : : "r" (sp_l) );                 \
                asm("pop r0"    "\n\t"                                  \