Added funtionality to run an automated test of all testsuite applications

directly from the build system on the qemu "board".

ports/cortex-m/boards/qemu/Makefile.include

@@ -12,4 +12,16 @@ OOCD_INTERFACE  ?= stlink-v2-1
 OOCD_BOARD      ?= st_nucleo_f103rb
 
 objs            += board_setup.o
-# aobjs           += helloworld.o
+# aobjs           += helloworld.o
+
+# Special requirements for running automated tests with QEMU
+
+QEMU            ?= qemu-system-gnuarmeclipse
+.DEFAULT_GOAL   := all
+.SECONDEXPANSION:
+
+.PHONY: qemutests
+qemutests: $$(addsuffix .sim, $$(sort $$(build_telfs)))
+
+%.sim: $$(basename $$@)
+	boards/qemu/run_test.exp $(QEMU) $(*)

ports/cortex-m/boards/qemu/README.md

@@ -15,7 +15,17 @@ a usable target.
 After installing you can use it to run the test binaries like this:
 
 ```
-qemu-system-gnuarmeclipse -nographic -monitor null -serial stdio \
-      -semihosting --semihosting-config target=native \
-      --machine NUCLEO-F103RB --kernel build/kern1.elf --verbose
+qemu-system-gnuarmeclipse -nographic -monitor null \
+      -semihosting --machine NUCLEO-F103RB \
+      --verbose --kernel build/kern1.elf
 ```
+
+The whole test suite can be run in an automatic way from the build system by
+using the tool `expect`.
+
+```
+make BOARD=qemu QEMU=/path/to/your/qemu/binary qemutests
+```
+
+If your qemu-binary is called `qemu-system-gnuarmeclipse` and is located
+in your search path, you can omit the `QEMU=...` part.

ports/cortex-m/boards/qemu/run_test.exp

@@ -0,0 +1,40 @@
+#!/usr/bin/env expect
+
+# Expect script to run an automated test within the simulator (QEMU) and
+# check for successful completion.
+#
+# Arguments: <path_to_qemu> <test_elf_file>
+#
+# Returns 0 on successful test run within QEMU, 1 on failure
+
+
+# Start the test
+spawn [lindex $argv 0] -nographic -monitor null -semihosting \
+    --machine NUCLEO-F103RB --kernel [lindex $argv 1]
+
+# Expect to see the test starting within 10 seconds
+set timeout 10
+
+# Wait for the test to start ("Go")
+expect {
+	"Go" {
+		puts "Test started"
+
+		# The test could take up to 3 minutes to complete once started
+		set timeout 180
+
+		# Now expect to see "Pass" or "Fail" within 3 minutes
+		expect {
+			"Pass" { puts "Test passed"; exit 0 }
+			"Fail" { puts "Test failed"; exit 1 }
+			timeout { puts "Test timed out without completing"; exit 1 }
+		}
+	}
+
+	timeout {
+		# Didn't receive "Go" within 10 seconds
+		puts "Test failed to start ('Go' not seen)"
+		exit 1
+	}
+}
+