add basic user-space tests with qemu

* configure.ac: move test fragment to have USER32
* tests/Makefrag.am: add user tests
* tests/README: add basic info on how to run and debug user tests
* tests/configfrag.ac: allow the test compiler/flags to be
  autoconfigured or customized
* tests/grub.cfg.single.template: add minimal grub config to boot a
  module
* tests/include/device/cons.h: add a simplified version of
  device/cons.h usable for tests
* tests/include/kern/printf.h: symlink to kern/printf.h
* tests/include/mach/mig_support.h: add basic version for user-space
  tests
* tests/include/syscalls.h: add prototypes for syscalls used in tests.
* tests/include/testlib.h: add definitions for common test
  functionalities
* tests/include/util/atoi.h: symlink to util/atoi.h
* tests/run-qemu.sh.template: add a simple qemu test runner
* tests/start.S: add arch-specific entry point
* tests/syscalls.S: generate syscalls entry points
* tests/test-hello.c: add basic smoke test
* tests/testlib.c: add the minimal functionality to run a user-space
  executable and reboot the system, and some test helpers.
* tests/user-qemu.mk: add rules to build simple user-space test
  modules, including generating mig stubs. The tests reuse some kernel
  code (like printf(), mach_atoi(), mem*(), str*() functions) so we can
  use the freestanding environment and not depend on glibc.
Message-ID: <20240111210907.419689-1-luca@orpolo.org>

1 files changed, 26 insertions, 0 deletions

diff --git a/tests/test-hello.c b/tests/test-hello.c
new file mode 100644
index 00000000..0d739c61
--- /dev/null
+++ b/tests/test-hello.c
@@ -0,0 +1,26 @@
+/*
+ *  Copyright (C) 2024 Free Software Foundation
+ *
+ * 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 ; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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 the program ; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <testlib.h>
+
+int main(int argc, char *argv[], int envc, char *envp[])
+{
+  int ret = printf("hello!!\n");
+  ASSERT_RET(ret, "printf() should return 0 here");
+  return 0;
+}