[PATCH 3/9] ntdll: Store x86_64 YMM context in syscall frame.

[Alexandre Julliard]

Jacek Caban <jacek at codeweavers.com> writes:

>  /**********************************************************************
>   *             signal_init_threading
>   */
>  void signal_init_threading(void)
>  {
> +    int regs[4];
> +    void *ptr;
> +
> +    extern void __wine_syscall_dispatcher_xsave(void) DECLSPEC_HIDDEN;
> +
> +    ntdll_cpuid( regs, 1, 0 );
> +    if (regs[2] & (0x1 << 27)) /* xsave OS enabled */
> +    {
> +        signal_syscall_dispatcher = __wine_syscall_dispatcher_xsave;
> +    }
> +
> +    /* sneak in a syscall dispatcher pointer at a fixed address (7ffe1000) */
> +    ptr = (char *)user_shared_data + page_size;
> +    anon_mmap_fixed( ptr, page_size, PROT_READ | PROT_WRITE, 0 );
> +    *(void **)ptr = signal_syscall_dispatcher;
>  }

It seems it would be cleaner to do this after we have done the full CPU
detection, and reuse the results instead of duplicating the cpuid checks.

-- 
Alexandre Julliard
julliard at winehq.org