Commit aa73a86c authored by Willy Tarreau's avatar Willy Tarreau Committed by Paul E. McKenney
Browse files

selftests/nolibc: on x86, support exiting with isa-debug-exit 



QEMU, when started with "-device isa-debug-exit -no-reboot" will exit
with status code 2N+1 when N is written to 0x501. This is particularly
convenient for automated tests but this is not portable. As such we
only enable this on x86_64 when pid==1. In addition, this requires an
ioperm() call but in order not to have to define arch-specific syscalls
we just perform the syscall by hand there.

Signed-off-by: default avatarWilly Tarreau <w@1wt.eu>
Signed-off-by: default avatarPaul E. McKenney <paulmck@kernel.org>
parent f49896d7

tools/testing/selftests/nolibc/nolibc-test.c

+9 −0
Original line number Diff line number Diff line
@@ -638,6 +638,15 @@ int main(int argc, char **argv, char **envp) 
		printf("Leaving init with final status: %d\n", !!ret);

		if (ret == 0)

			reboot(LINUX_REBOOT_CMD_POWER_OFF);

#if defined(__x86_64__)

		/* QEMU started with "-device isa-debug-exit -no-reboot" will

		 * exit with status code 2N+1 when N is written to 0x501. We

		 * hard-code the syscall here as it's arch-dependent.

		 */

		else if (my_syscall3(__NR_ioperm, 0x501, 1, 1) == 0)

			asm volatile ("outb %%al, %%dx" :: "d"(0x501), "a"(0));

		/* if it does nothing, fall back to the regular panic */

#endif

	}



	printf("Exiting with status %d\n", !!ret);