altos: add GCC/SDCC compat macros, init_stack, save_context and GCC stdio hooks

More arch-indepdency bits.

GCC stdio is different from SDCC, so create suitable code in
avr/ao_avr_stdio.c

Create macros to initialize the task stack frame and save the task
context.

Add GCC/SDCC type definition compatibility macros

Signed-off-by: Keith Packard <keithp@keithp.com>

1 files changed, 65 insertions, 2 deletions

diff --git a/src/avr/ao_arch.h b/src/avr/ao_arch.h
index 2b566814..51a65880 100644
--- a/src/avr/ao_arch.h
+++ b/src/avr/ao_arch.h
@@ -18,8 +18,18 @@
 #ifndef _AO_ARCH_H_
 #define _AO_ARCH_H_
 
-#include "avr.h"
+#include <avr/io.h>
+#include <avr/interrupt.h>
 
+#ifdef AVR_DEMO
+#define TEENSY 1
+#endif
+
+#if TEENSY
+#define F_CPU 16000000UL	// 16 MHz
+#else
+#define F_CPU  8000000UL	// 8 MHz
+#endif
 
 /*
  * AVR definitions and code fragments for AltOS
@@ -29,8 +39,61 @@
 
 /* Various definitions to make GCC look more like SDCC */
 
-#define __naked __attribute__((naked))
+#define ao_arch_naked_declare	__attribute__((naked))
+#define ao_arch_naked_define
+#define __pdata
+#define __data
+#define __xdata
+#define __code const
+#define __reentrant
+#define __critical
+#define __interrupt(n)
 
 #define ao_arch_reboot()	/* XXX */
 
+#define ao_arch_nop()		asm("nop")
+
+#define ao_arch_interrupt(n)	/* nothing */
+
+#undef putchar
+#undef getchar
+#define putchar(c)	ao_putchar(c)
+#define getchar		ao_getchar
+
+extern void putchar(char c);
+extern char getchar(void);
+
+extern int ao_serial_number;
+
+#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 */					\
+	PUSH8(sp, a);						\
+	PUSH8(sp, (a >> 8));					\
+								\
+	/* Clear register values */				\
+	i = 32;							\
+	while (i--)						\
+		PUSH8(sp, 0);					\
+								\
+	/* SREG with interrupts enabled */			\
+	PUSH8(sp, 0x80);					\
+	task->sp = sp;						\
+} while (0);
+	
+#define ao_arch_save_context() do {			\
+	asm("push r31" "\n\t" "push r30"); \
+	asm("push r29" "\n\t" "push r28" "\n\t" "push r27" "\n\t" "push r26" "\n\t" "push r25"); \
+	asm("push r24" "\n\t" "push r23" "\n\t" "push r22" "\n\t" "push r21" "\n\t" "push r20"); \
+	asm("push r19" "\n\t" "push r18" "\n\t" "push r17" "\n\t" "push r16" "\n\t" "push r15"); \
+	asm("push r14" "\n\t" "push r13" "\n\t" "push r12" "\n\t" "push r11" "\n\t" "push r10"); \
+	asm("push r9" "\n\t" "push r8" "\n\t" "push r7" "\n\t" "push r6" "\n\t" "push r5"); \
+	asm("push r4" "\n\t" "push r3" "\n\t" "push r2" "\n\t" "push r1" "\n\t" "push r0"); \
+	asm("in r0, __SREG__" "\n\t" "push r0"); \
+	sei(); \
+	} while (0)
+
 #endif /* _AO_ARCH_H_ */