Hollis Blanchard <[EMAIL PROTECTED]> writes: > On Dec 1, 2005, at 7:48 AM, Marco Gerards wrote: >>> Files affected: kern/mm.c, normal/misc.c >>> >>> This is probably more a gcc issue (my is gcc version 3.3.3 (NetBSD nb3 >>> 20040520)). As of 2.0, NetBSD/i386 uses non-executable mapping of >>> stack >>> and thus when nested functions are used it generates call to >>> __enable_execute_stack() (which is actually in libgcc) even if >>> -nostdlib >>> is used. Since I know no way to disable this behavior (but there >>> might be >>> some) only workaround known to me is providing dumb >>> __enable_execute_stack() >>> functions where apropriate. >> >> When is this required? When using grub-emu or any other userland >> utility? In that case GRUB is linked to the C library. >> >> In the case it is used for GRUB itself, it is useless. GRUB executes >> within its own environment. So in that case we should just make sure >> this doesn't show up. Perhaps by using different compiler flags. > > I think this is a problem Peter Jones was telling me about with Fedora > as well (non-executable stack conflicting with nested functions). > > Peter, do you know anything about that __enable_execute_stack()? > http://gcc.gnu.org/ml/gcc-patches/2004-07/msg01700.html seems to > indicate it's only for Solaris, NetBSD, FreeBSD/SPARC64 and OSF, but > it sounds like we need it on Linux as well?
In that case we only need it in util/, I assume? I wonder if it is possible to check this using autoconf and add it to util/misc.c in some initialization function (that yet has to be written). I was told that -ftrampolines might fix our problem, so looking at that flag might be useful. -- Marco _______________________________________________ Grub-devel mailing list Grub-devel@gnu.org http://lists.gnu.org/mailman/listinfo/grub-devel
