diff options
| author | Willy Tarreau <w@1wt.eu> | 2022-07-19 23:44:41 +0200 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@kernel.org> | 2022-08-31 05:17:44 -0700 |
| commit | aa73a86cda26705c7f0af1afe9bb255a52accf87 (patch) | |
| tree | a976abeb99590058e95b486e51e714c3c0a45a74 /tools/testing/selftests/nolibc | |
| parent | f49896d7d9a69b7565a59f5085c78ca1c08c7dd7 (diff) | |
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: Willy Tarreau <w@1wt.eu>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Diffstat (limited to 'tools/testing/selftests/nolibc')
| -rw-r--r-- | tools/testing/selftests/nolibc/nolibc-test.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/tools/testing/selftests/nolibc/nolibc-test.c b/tools/testing/selftests/nolibc/nolibc-test.c index 291d96bfd7c1..eeb254749239 100644 --- a/tools/testing/selftests/nolibc/nolibc-test.c +++ b/tools/testing/selftests/nolibc/nolibc-test.c @@ -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); |