On Sun, 9 Jan 2022 at 16:33, Warner Losh <[email protected]> wrote:
>
> Implement host_signal_pc, host_signal_set_pc and host_signal_write for
> arm.
>
> Signed-off-by: Kyle Evans <[email protected]>
> Signed-off-by: Warner Losh <[email protected]>
> +static inline bool host_signal_write(siginfo_t *info, ucontext_t *uc)
> +{
> + /*
> + * In the FSR, bit 11 is WnR. FreeBSD returns this as part of the
> + * si_info.si_trapno which we don't have access to here. We assume that
> uc
> + * is part of a trapframe and reach around to get to the si_info that's
> in
> + * the sigframe just before it, though this may be unwise.
> + */
Yeah, that's pretty nasty. But this function is passed a
siginfo_t pointer -- isn't that the one you need ?
> + siginfo_t *si;
> + si = &((siginfo_t *)uc)[-1];
> + uint32_t fsr = si->si_trapno;
> +
> + return extract32(fsr, 11, 1);
> +}
thanks
-- PMM
