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

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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>
This commit is contained in:
Willy Tarreau 2022-07-19 23:44:41 +02:00 committed by Paul E. McKenney
parent f49896d7d9
commit aa73a86cda
1 changed files with 9 additions and 0 deletions
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9
tools/testing/selftests/nolibc/nolibc-test.c
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@ -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);