From c54ba4178159e440bea3826d22d43a9d0d94b071 Mon Sep 17 00:00:00 2001 From: Willy Tarreau Date: Sat, 21 Jan 2023 09:53:20 +0100 Subject: [PATCH] selftests/nolibc: Add a "run-user" target to test the program in user land When developing tests, it is much faster to use the QEMU Linux emulator instead of the system emulator, which among other things avoids kernel-build latencies. Although use of the QEMU Linux emulator does have its limitations (please see below), it is sufficient to test startup code, stdlib code, and syscall calling conventions. However, the current mainline Linux-kernel nolibc setup does not support this. Therefore, add a "run-user" target that immediately executes the prebuilt executable. Again, this approach does have its limitations. For example, the executable runs with the user's privilege level, which can cause some false-positive failures due to insufficient permissions. In addition, if the underlying kernel is old enough to lack some features that nolibc relies on, the result will be false-positive failures in the corresponding tests. However, for nolibc changes not affected by these limittions, the result is a much faster code-compile-test-debug cycle. With this patch, running a userland test is as simple as issuing: make ARCH=xxx CROSS_COMPILE=xxx run-user Signed-off-by: Willy Tarreau Tested-by: Ammar Faizi Signed-off-by: Paul E. McKenney --- tools/testing/selftests/nolibc/Makefile | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/tools/testing/selftests/nolibc/Makefile b/tools/testing/selftests/nolibc/Makefile index 423598045ff16..8fe61d3e3cce0 100644 --- a/tools/testing/selftests/nolibc/Makefile +++ b/tools/testing/selftests/nolibc/Makefile @@ -80,6 +80,7 @@ help: @echo " help this help" @echo " sysroot create the nolibc sysroot here (uses \$$ARCH)" @echo " nolibc-test build the executable (uses \$$CC and \$$CROSS_COMPILE)" + @echo " run-user runs the executable under QEMU (uses \$$ARCH, \$$TEST)" @echo " initramfs prepare the initramfs with nolibc-test" @echo " defconfig create a fresh new default config (uses \$$ARCH)" @echo " kernel (re)build the kernel with the initramfs (uses \$$ARCH)" @@ -113,6 +114,11 @@ nolibc-test: nolibc-test.c sysroot/$(ARCH)/include $(QUIET_CC)$(CC) $(CFLAGS) $(LDFLAGS) -o $@ \ -nostdlib -static -Isysroot/$(ARCH)/include $< -lgcc +# qemu user-land test +run-user: nolibc-test + $(Q)qemu-$(QEMU_ARCH) ./nolibc-test > "$(CURDIR)/run.out" || : + $(Q)grep -w FAIL "$(CURDIR)/run.out" && echo "See all results in $(CURDIR)/run.out" || echo "$$(grep -c ^[0-9].*OK $(CURDIR)/run.out) test(s) passed." + initramfs: nolibc-test $(QUIET_MKDIR)mkdir -p initramfs $(call QUIET_INSTALL, initramfs/init) -- 2.30.2