Hi Oleg,
>
> I don't have a powerpc machine, but I think this test-case should
> see the difference:
On a powerpc machine, I did verify that the below test-case differs with
your patch. Without the patch it would print the message
"kernel bug: status=857F shouldn't have 0x80"
>
> #include <unistd.h>
> #include <sys/ptrace.h>
> #include <sys/wait.h>
> #include <assert.h>
> #include <stdio.h>
>
> int main(void)
> {
> int pid, status;
>
> if (!(pid = fork())) {
> assert(ptrace(PTRACE_TRACEME) == 0);
> kill(getpid(), SIGSTOP);
>
> getppid();
>
> return 0;
> }
>
> assert(pid == wait(&status));
> assert(ptrace(PTRACE_SETOPTIONS, pid, 0, PTRACE_O_TRACESYSGOOD)
> == 0);
>
> assert(ptrace(PTRACE_SYSCALL, pid, 0,0) == 0);
> assert(pid == wait(&status));
>
> assert(ptrace(PTRACE_SINGLESTEP, pid, 0,0) == 0);
> assert(pid == wait(&status));
>
> if (status == 0x57F)
> return 0;
>
> printf("kernel bug: status=%X shouldn't have 0x80\n", status);
> return 1;
> }
