Re: [PATCH v4 05/25] linux-user/arm: Implement setup_sigtramp

[Richard Henderson]

On 9/28/21 5:31 AM, Peter Maydell wrote:
> > +        uint32_t *host_rc = g2h_untagged(retcode);
>
> ...but here we treat it as a normal guest address that we can
> convert into a host address and dereference. If the signal handler
> is being entered in Thumb mode this will be a misaligned pointer.

Oops, yes.

I've no idea why the kernel works so hard to match the mode of the signal handler to the 
mode of the trampoline, but I presume it's ABI at this point.


r~