[M68K/ColdFire] NPTL support and other updates

[Maxim Kuvyrkov]

Good day,

In this thread I will post patches to M68K/ColdFire port that add NPTL 
support and other necessary updates to make trunk GLIBC build and work 
properly.

The patches posted here were tested against 2.10 branch on a ColdFire 
system with no test failures in elf/ and nptl/ directories.

Truth be told, I mainly focused on the ColdFire port, and didn't test 
the work on usual m68k.  Still, to my knowledge, the only place m68k 
functionality is missing, is atomic macros implementations in 
./sysdeps/unix/sysv/linux/m68k/nptl/atomic.h, which should be straight 
forward to fix: the memory barrier macro should be the same as in 
coldfire's implementation and compare_exchange macro should be a wrapper 
for 'cas'.

Further, I still have one more patch in my pipeline.  The patch fixes 
register-dump.h and regs.h, but I need some time to verify that the 
fixed versions correlate with ColdFire kernels.

Even further, to make the port build on trunk (not 2.10 branch), one 
needs to update ____longjmp_chk, something I had not yet started on.

Finally, to build M68K/ColdFire GLIBC *without bugs*, one will need the 
very recent snapshots of binutils, gcc and kernel.  The threads for 
binutils and gcc patches that fix last /known to date/ bugs are 
(http://sourceware.org/ml/binutils/2009-08/msg00461.html) and 
(http://gcc.gnu.org/ml/gcc-patches/2009-08/msg01253.html).  The kernel 
patches (http://marc.info/?l=linux-m68k&m=125054669119207&q=p4 and 
http://marc.info/?l=linux-m68k&m=125105890201426&q=p3) are not intrusive 
and can be ported to the kernel version of one's choice.

Andreas, I thank you in advance for reviewing this work.

Last, but not least, I'd like to give credit for this work to my 
colleagues at CodeSourcery, especially, Joseph S. Myers and Daniel 
Jacobowitz, for their help and expertise during this project.

Regards,

--
Maxim Kuvyrkov
CodeSourcery