added 'hello world' to the self-test

Makefile

@@ -12,12 +12,13 @@ ASFLAGS = --32
 tester: ihexread.o avr_core_x86.o tester.o
 
 clean:
-	rm *.o tester
+	rm -f *.o tester
 
 # the tinyTwofish known-answer-test sends the mcu in an infinite loop
 # if an error is encountered; or it will stop with a sleep instruction
 # (reporting last opcode 9588) -- we check this
 selftest: tester tinyTwofish/2fish_avr.s
+	make -B -C example | grep 'Hello, world!'
 	make -B -C tinyTwofish ckat CHIP=atmega2560
 	avr-objcopy -O ihex tinyTwofish/ckat twofish.hex
 	./tester twofish.hex 2>&1 | grep '\[9588\]$$'

example/Makefile

@@ -0,0 +1,13 @@
+.SUFFIXES: .hex .elf
+
+test: hello.hex
+	../tester hello.hex 2> /dev/null
+
+clean:
+	rm -f hello.hex hello.o hello.elf
+
+.elf.hex:
+	avr-objcopy -j .text -j .data -O ihex $< $@
+
+.c.elf:
+	avr-gcc -mmcu=atmega2560 $< -o$@

example/hello.c

@@ -0,0 +1,84 @@
+/* Copyright (c) 2002, 2005, 2007 Joerg Wunsch
+   All rights reserved.
+
+   Portions of documentation Copyright (c) 1990, 1991, 1993
+   The Regents of the University of California.
+
+   All rights reserved.
+
+   Redistribution and use in source and binary forms, with or without
+   modification, are permitted provided that the following conditions are met:
+
+   * Redistributions of source code must retain the above copyright
+     notice, this list of conditions and the following disclaimer.
+
+   * Redistributions in binary form must reproduce the above copyright
+     notice, this list of conditions and the following disclaimer in
+     the documentation and/or other materials provided with the
+     distribution.
+
+   * Neither the name of the copyright holders nor the names of
+     contributors may be used to endorse or promote products derived
+     from this software without specific prior written permission.
+
+  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+  POSSIBILITY OF SUCH DAMAGE.
+*/
+
+/* Demo "Hello world"; taken from the stdiodemo in avr-libc with slight modifications 
+ * -- Marc Schoolderman */
+
+#include <avr/io.h>
+#include <avr/sleep.h>
+#define F_CPU   16000000
+#define UART_BAUD  38400
+
+void
+uart_init(void)
+{
+#if F_CPU < 2000000UL && defined(U2X)
+  UCSR0A = _BV(U2X);             /* improve baud rate error by using 2x clk */
+  UBRR0L = (F_CPU / (8UL * UART_BAUD)) - 1;
+#else
+  UBRR0L = (F_CPU / (16UL * UART_BAUD)) - 1;
+#endif
+  UCSR0B = _BV(TXEN0) | _BV(RXEN0); /* tx/rx enable */
+}
+
+#include <stdio.h>
+
+static int uart_putchar(char c, FILE *stream);
+
+static FILE mystdout = FDEV_SETUP_STREAM(uart_putchar, NULL,
+					 _FDEV_SETUP_WRITE);
+
+static int
+uart_putchar(char c, FILE *stream)
+{
+
+  if (c == '\n')
+    uart_putchar('\r', stream);
+  loop_until_bit_is_set(UCSR0A, UDRE0);
+  UDR0 = c;
+  return 0;
+}
+
+int
+main(void)
+{
+  uart_init();
+  stdout = &mystdout;
+  printf("Hello, world!\n");
+
+  sleep_cpu();
+  return 0;
+}