create userland tests

Fix some more tabs.

Parse the "Simulated exit code not 0!" string in gem5 and exit with the proper status

test-userland

@@ -0,0 +1,47 @@
+#!/usr/bin/env python3
+
+import os
+
+import common
+
+class Main(common.LkmcCliFunction):
+    def timed_main(self):
+        run = self.import_path('run').Main()
+        sources = [
+            'add.c',
+            'hello.c',
+            'hello_cpp.cpp',
+            'print_argv.c',
+        ]
+        # for emulator in self.env['emulators']:
+        for emulator in ['gem5']:
+            if emulator == 'gem5':
+                extra_args = {
+                    'userland_build_id': 'static',
+                }
+            else:
+                extra_args = {}
+            for arch in self.env['all_archs']:
+                if arch == 'x86_64':
+                    arch_sources = [
+                        'asm_hello'
+                    ]
+                elif arch == 'aarch64':
+                    arch_sources = [
+                        'asm_hello'
+                    ]
+                else:
+                    arch_sources = []
+                arch_sources[:] = [os.path.join('arch', arch, arch_source) for arch_source in arch_sources]
+                for source in sources + arch_sources:
+                    exit_status = run(
+                        arch=arch,
+                        userland=source,
+                        emulator=emulator,
+                        **extra_args,
+                    )
+                    if exit_status != 0:
+                        raise Exception('Test failed: {} {} {} {}'.format(emulator, arch, source, exit_status))
+
+if __name__ == '__main__':
+    Main().cli()