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, 52 insertions, 0 deletions

diff --git a/src/avr/ao_avr_stdio.c b/src/avr/ao_avr_stdio.c
new file mode 100644
index 00000000..2f358eb5
--- /dev/null
+++ b/src/avr/ao_avr_stdio.c
@@ -0,0 +1,52 @@
+/*
+ * Copyright © 2011 Keith Packard <keithp@keithp.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ */
+
+#include "ao.h"
+
+int
+stdio_put(char c, FILE *stream)
+{
+	if (ao_cur_task && ao_num_stdios)
+		putchar(c);
+	else
+	{
+		if (c == '\n')
+			stdio_put('\r', stream);
+		loop_until_bit_is_set(UCSR1A, UDRE1);
+		UDR1 = c;
+	}
+
+	return 0;
+}
+
+int
+stdio_get(FILE *stream)
+{
+	return (int) getchar() & 0xff;
+}
+
+static FILE mystdout = FDEV_SETUP_STREAM(stdio_put, NULL, _FDEV_SETUP_WRITE);
+
+static FILE mystdin = FDEV_SETUP_STREAM(NULL, stdio_get, _FDEV_SETUP_READ);
+
+void
+ao_stdio_init(void)
+{
+	stdout = &mystdout;
+	stdin = &mystdin;
+	printf("%d stdios registered\n", ao_num_stdios);
+}