Re: [Qemu-devel] [PATCH 06/26] target/s390x: implement LOAD PAIR FROM QUADWORD

[Richard Henderson <rth@twiddle.net>]

On 05/25/2017 02:04 PM, Aurelien Jarno wrote:
> +static ExitStatus op_lpq(DisasContext *s, DisasOps *o)
> +{
> +    /* In a parallel context, stop the world and single step.  */
> +    if (parallel_cpus) {
> +        potential_page_fault(s);
> +        gen_exception(EXCP_ATOMIC);
> +        return EXIT_NORETURN;
> +    }
> +
> +    /* In a serial context, perform the two loads ... */
> +    tcg_gen_qemu_ld64(o->out, o->in2, get_mem_index(s));
> +    tcg_gen_addi_i64(o->in2, o->in2, 8);
> +    tcg_gen_qemu_ld64(o->out2, o->in2, get_mem_index(s));
> +    return NO_EXIT;
> +}

This can be implemented in a parallel context with helper_atomic_ldo_be_mmu, 
though that must be done with a helper function.


r~