On Wed, May 18, 2011 at 8:49 PM, Ariane van der Steldt <ari...@stack.nl>
wrote:
> On Thu, May 19, 2011 at 03:32:10AM +0200, Ariane van der Steldt wrote:
>> Hi,
>>
>> I would respond in-thread, but I can't find the thread that had the
>> original report that emacs-22 doesn't work under vmmap. Perhaps it was
>> only on icb...
>>
>> Anyways, emacs-22.3p8 doesn't work under vmmap on i386. And the lovely
>> thing is, it's not my bug. :)
>> Emacs, by way of elf commands, insists on having the data area
>> (ep_daddr) start at address 0x81bd000 (approx 136MB). This means that,
>> starting at that address, a huge amount of memory (BRKSIZ + MAXDSIZ =
>> 3GB) is unavailable to load libraries.
>>
>> Normally, this is not a problem (try this on sparc and it just works,
>> for example). But i386 is special in the way it handles W^X requiring
>> approx 512MB to load libraries (this presentation explains it all:
>> http://www.openbsd.org/papers/ven05-deraadt/index.html ).
>>
>> Short story long, emacs fails to load its libraries into the area it
>> reserved for brk() and our ld.so, noticing it is asked to work miracles
>> here, rightfully objects.
>>
>> Possible way to fix this: teach emacs to be happy with the default
>> ep_daddr instead of being special or get PXE working (hint hint!).
>
> s/PXE/PAE/ (hint hint!)
> --
> Ariane
>
>
Or we could all just use vi{m} as god intended.
/me ducks
