On Fri, 25 Jul 2008 22:51:09 +0200 kenneth johansson <[EMAIL PROTECTED]> wrote:
> > Hmm...looks like linking with -pie (or --pic-executable) does > > something vaguely resembling the trick. But I don't know what vintage > > of ld you need for this to be available and actually work... > > Can't see any reason for using this flag over -fPIC for a program like > u-boot. You need both. One is a compiler flag, the other is a linker flag. The linker will probably barf if you try to create a PIC executable from modules that were not compiled with -fPIC. On the other hand, using -fPIC but not -pie takes us about 95% of the way to a fully relocatable u-boot, and is what PowerPC, AVR32 and others are doing today. The remaining cases -- static and global initialized pointers -- are fixed up manually. If we link with -pie and add a bit of code to handle the dynamic relocations, we could get rid of the manual fixups. I don't know if the result would be larger or smaller than what we have today, but it would probably be a bit more robust. > > Does this really work without any relocation? Or is it being relocated > > and I'm just too blind to see it? > > No you are right there is probably many places like this. the code just > use the old location and that works most of the time. Ah, of course. The strings are probably read directly from flash. Haavard ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ U-Boot-Users mailing list U-Boot-Users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/u-boot-users
