Re: [PATCH v2 2/3] linux-user/aarch64: Check syndrome for EXCP_UDEF

[Richard Henderson]

On 8/4/25 20:25, Peter Maydell wrote:

I'm OK with leaving this as a FIXME with a comment like

          /*
           * FIXME: The kernel fixes up wrong-option exceptions.
           * For QEMU linux-user mode, you can only get these if
           * the process is doing something silly (not executing
           * the MOPS instructions in the required P/M/E sequence),
           * so it is not a problem in practice that we do not.
           *
           * We ought ideally to implement the same "rewind to the
           * start of the sequence" logic that the kernel does in
           * arm64_mops_reset_regs(). In the meantime, deliver
           * the guest a SIGILL, with the same ILLOPN si_code
           * we've always used for this.
           */

Thanks.  I've used this verbatim.


r~