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
