sparc: fix accurate exception reporting in copy_{from_to}_user for UltraSPARC III

Anthony Yznaga tracked down that a BUG_ON in ext4 code with large folios
enabled resulted from copy_from_user() returning impossibly large values
greater than the size to be copied. This lead to __copy_from_iter()
returning impossible values instead of the actual number of bytes it was
able to copy.

The BUG_ON has been reported in
https://lore.kernel.org/r/[e-mail]

The referenced commit introduced exception handlers on user-space memory
references in copy_from_user and copy_to_user. These handlers return from
the respective function and calculate the remaining bytes left to copy
using the current register contents. The exception handlers expect that
%o2 has already been masked during the bulk copy loop, but the masking was
performed after that loop. This will fix the return value of copy_from_user
and copy_to_user in the faulting case. The behaviour of memcpy stays
unchanged.

Fixes: ee841d0aff64 ("sparc64: Convert U3copy_{from,to}_user to accurate exception reporting.")
Tested-by: John Paul Adrian Glaubitz <[e-mail]> # on Sun Netra 240
Reviewed-by: Anthony Yznaga <[e-mail]>
Tested-by: René Rebe <[e-mail]> # on UltraSparc III+ and UltraSparc IIIi
Signed-off-by: Michael Karcher <[e-mail]>
Reviewed-by: Andreas Larsson <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Andreas Larsson <[e-mail]>

arch/sparc/lib/U3memcpy.S

···
 	faligndata	%f10, %f12, %f26
 	EX_LD_FP(LOAD(ldd, %o1 + 0x040, %f0), U3_retl_o2)
 
+	and		%o2, 0x3f, %o2
 	subcc		GLOBAL_SPARE, 0x80, GLOBAL_SPARE
 	add		%o1, 0x40, %o1
 	bgu,pt		%XCC, 1f
···
 	 * Also notice how this code is careful not to perform a
 	 * load past the end of the src buffer.
 	 */
-	and		%o2, 0x3f, %o2
 	andcc		%o2, 0x38, %g2
 	be,pn		%XCC, 2f
 	 subcc		%g2, 0x8, %g2