Re: CVS commit: src/sys/arch/mips/include

[Alexander Nasonov <alnsn%yandex.ru@localhost>]

Matt Thomas wrote:
> 
> On Jul 22, 2014, at 2:27 PM, Alexander Nasonov <alnsn%yandex.ru@localhost> 
> wrote:
> > I allocate with the X flag and it seems to work:
> > 
> > /* in sljitExecAllocator.c */
> >        return (void *)uvm_km_alloc(module_map, size,
> >            PAGE_SIZE, UVM_KMF_WIRED | UVM_KMF_ZERO | UVM_KMF_EXEC);
> 
> ok.  Then you need don't a hook for cache flushing
> 
> pmap_protect(vm_map_pamp(module_map), va, size) will do that for you.
> At least for arm/mips/ppc/vax.  (e.g. changing a writeable exec page
> to read-only automatically causes it exec cleaned).

sljit allocates 64K exec chucks which are managed by a special allocator.
You need to run pmap_protect for each chunk. I think it's cheaper to
flush icache.

Alex