powerpc: Put FP/VSX and VR state into structures

This creates new 'thread_fp_state' and 'thread_vr_state' structures
to store FP/VSX state (including FPSCR) and Altivec/VSX state
(including VSCR), and uses them in the thread_struct.  In the
thread_fp_state, the FPRs and VSRs are represented as u64 rather
than double, since we rarely perform floating-point computations
on the values, and this will enable the structures to be used
in KVM code as well.  Similarly FPSCR is now a u64 rather than
a structure of two 32-bit values.

This takes the offsets out of the macros such as SAVE_32FPRS,
REST_32FPRS, etc.  This enables the same macros to be used for normal
and transactional state, enabling us to delete the transactional
versions of the macros.   This also removes the unused do_load_up_fpu
and do_load_up_altivec, which were in fact buggy since they didn't
create large enough stack frames to account for the fact that
load_up_fpu and load_up_altivec are not designed to be called from C
and assume that their caller's stack frame is an interrupt frame.

Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

diff --cc arch/powerpc/include/asm/ppc_asm.h
Simple merge

diff --cc arch/powerpc/include/asm/processor.h
Simple merge

diff --cc arch/powerpc/include/asm/sfp-machine.h
Simple merge

diff --cc arch/powerpc/kernel/align.c
Simple merge

diff --cc arch/powerpc/kernel/asm-offsets.c
Simple merge

diff --cc arch/powerpc/kernel/fpu.S
Simple merge

diff --cc arch/powerpc/kernel/process.c
Simple merge

diff --cc arch/powerpc/kernel/ptrace.c
Simple merge

diff --cc arch/powerpc/kernel/ptrace32.c
Simple merge

diff --cc arch/powerpc/kernel/signal_32.c
Simple merge

diff --cc arch/powerpc/kernel/signal_64.c
Simple merge

diff --cc arch/powerpc/kernel/tm.S
Simple merge

diff --cc arch/powerpc/kernel/traps.c
Simple merge

diff --cc arch/powerpc/kernel/vecemu.c
Simple merge

diff --cc arch/powerpc/kernel/vector.S
Simple merge

diff --cc arch/powerpc/kvm/book3s_pr.c
Simple merge

diff --cc arch/powerpc/kvm/booke.c
Simple merge