Hello!

The gcc simulate-thread.exp testsuite exposed the problem in handling
of alpha atomic sequences. Single-stepping broke link in alpha's LL/SC
atomic sequences.

Attached patch copies handling of atomic sequences from rs6000-tdep.c
and adapts the functionality for alpha.

2011-11-16  Uros Bizjak  <ubizjak@gmail.com>

	* alpha-tdep.c (beq_opcode): New.
	(ldl_l_opcode, ldq_l_opcode, stl_c_opcode, stq_c_opcode): Ditto.
	(alpha_deal_with_atomic_sequence): New function.
	(alpha_gdbarch_init): Handle single stepping of atomic sequences
	with alpha_deal_with_atomic_sequence.

Patched gdb survives simulate-thread.exp testsuite on native
alphaev68-pc-linux-gnu.

I don't have write access, so If OK, please someone commit this patch
to gdb CVS.

Uros.