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Re: CVS commit: src/sys/arch/mips/include
On Jul 22, 2014, at 2:27 PM, Alexander Nasonov <alnsn%yandex.ru@localhost>
wrote:
> Matt Thomas wrote:
>>
>> On Jul 22, 2014, at 12:54 PM, Alexander Nasonov <alnsn%netbsd.org@localhost>
>> wrote:
>>
>>> Module Name: src
>>> Committed By: alnsn
>>> Date: Tue Jul 22 19:54:55 UTC 2014
>>>
>>> Modified Files:
>>> src/sys/arch/mips/include: sljitarch.h
>>>
>>> Log Message:
>>> Define SLJIT_CACHE_FLUSH() for mips.
>>
>> Actually, this isn't enough. You need to allocate a page of mapped
>> memory as RWX and then when you are done use pmap_protect to change
>> it to RX followed by pmap_update() and the pmap will automagically
>> sync the page for you.
>
> 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).
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