tests: Enable test running outside of gem5's source tree

The learning gem5 scripts currently assumes that the current working
directory is the root of gem5's source tree. This isn't necessarily
the case when running the tests using gem5's new test runner.

Change-Id: Ief569bbe77b1b3e2b0fb0e6c575fb0705bbba9b3
Signed-off-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-by: Curtis Dunham <curtis.dunham@arm.com>

tests/configs/learning-gem5-p1-simple.py

@@ -35,5 +35,10 @@ root = None
 def run_test(root):
         # Called from tests/run.py
 
+        # Set the working directory in case we are executing from
+        # outside gem5's source tree
+        import os
+        os.chdir(os.path.join(os.path.dirname(__file__), "../"))
+
         # Execute the script we are wrapping
-        execfile('configs/learning_gem5/part1/simple.py')
+        execfile(srcpath('configs/learning_gem5/part1/simple.py'))

tests/configs/learning-gem5-p1-two-level.py

@@ -37,6 +37,12 @@ import m5
 def run_test(root):
         # Called from tests/run.py
 
+
+        # Set the working directory in case we are executing from
+        # outside gem5's source tree
+        import os
+        os.chdir(os.path.join(os.path.dirname(__file__), "../"))
+
         # Add paths that we need
         m5.util.addToPath('../configs/learning_gem5/part1')
         m5.util.addToPath('../configs/common')
@@ -49,4 +55,4 @@ def run_test(root):
         # For instance, sys.argv.append('--l2_size=512kB')
 
         # Execute the script we are wrapping
-        execfile('configs/learning_gem5/part1/two_level.py')
+        execfile(srcpath('configs/learning_gem5/part1/two_level.py'))

tests/configs/memcheck.py

@@ -47,6 +47,11 @@ root = None
 def run_test(root):
         # Called from tests/run.py
 
+        # Set the working directory in case we are executing from
+        # outside gem5's source tree
+        import os
+        os.chdir(os.path.join(os.path.dirname(__file__), "../"))
+
         # The path to this script is the only parameter. Delete it so
         # we can execute the script that we want to execute.
         import sys
@@ -56,4 +61,4 @@ def run_test(root):
         sys.argv.append('-m %d' % maxtick)
 
         # Execute the script we are wrapping
-        execfile('configs/example/memcheck.py', globals())
+        execfile(srcpath('configs/example/memcheck.py'), globals())

tests/run.py

@@ -171,6 +171,10 @@ def inputpath(app, file=None):
         file = app
     return joinpath(test_progs, app, 'input', file)
 
+def srcpath(path):
+    """Path to file in gem5's source tree"""
+    return joinpath(os.path.dirname(__file__), "..", path)
+
 # build configuration
 sys.path.append(joinpath(tests_root, 'configs'))
 test_filename = config