sh: Add ashrsi3 libgcc function

The ashrsi3 function is used by some commands that aren't in SH2A
default configs (e.g. JFFS2).

The ashrsi3.S file has been copied from Linux.

Signed-off-by: Phil Edworthy <phil.edworthy@renesas.com>
Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>

arch/sh/lib/Makefile

@@ -28,6 +28,7 @@ GLSOBJS	+= ashiftrt.o
 GLSOBJS	+= ashiftlt.o
 GLSOBJS	+= lshiftrt.o
 GLSOBJS	+= ashldi3.o
+GLSOBJS	+= ashrsi3.o
 GLSOBJS	+= lshrdi3.o
 GLSOBJS	+= movmem.o
 

arch/sh/lib/ashrsi3.S

+/* Copyright (C) 1994, 1995, 1997, 1998, 1999, 2000, 2001, 2002, 2003,
+   2004, 2005, 2006
+   Free Software Foundation, Inc.
+
+This file is free software; you can redistribute it and/or modify it
+under the terms of the GNU General Public License as published by the
+Free Software Foundation; either version 2, or (at your option) any
+later version.
+
+In addition to the permissions in the GNU General Public License, the
+Free Software Foundation gives you unlimited permission to link the
+compiled version of this file into combinations with other programs,
+and to distribute those combinations without any restriction coming
+from the use of this file.  (The General Public License restrictions
+do apply in other respects; for example, they cover modification of
+the file, and distribution when not linked into a combine
+executable.)
+
+This file is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; see the file COPYING.  If not, write to
+the Free Software Foundation, 51 Franklin Street, Fifth Floor,
+Boston, MA 02110-1301, USA.  */
+
+!! libgcc routines for the Renesas / SuperH SH CPUs.
+!! Contributed by Steve Chamberlain.
+!! sac@cygnus.com
+
+!! ashiftrt_r4_x, ___ashrsi3, ___ashlsi3, ___lshrsi3 routines
+!! recoded in assembly by Toshiyasu Morita
+!! tm@netcom.com
+
+/* SH2 optimizations for ___ashrsi3, ___ashlsi3, ___lshrsi3 and
+   ELF local label prefixes by J"orn Rennecke
+   amylaar@cygnus.com  */
+
+!
+! __ashrsi3
+!
+! Entry:
+!
+! r4: Value to shift
+! r5: Shifts
+!
+! Exit:
+!
+! r0: Result
+!
+! Destroys:
+!
+! (none)
+!
+
+	.global	__ashrsi3
+	
+	.align	2
+__ashrsi3:
+	mov	#31,r0
+	and	r0,r5
+	mova	ashrsi3_table,r0
+	mov.b	@(r0,r5),r5
+#ifdef __sh1__
+	add	r5,r0
+	jmp	@r0
+#else
+	braf	r5
+#endif
+	mov	r4,r0
+
+	.align	2
+ashrsi3_table:
+	.byte		ashrsi3_0-ashrsi3_table
+	.byte		ashrsi3_1-ashrsi3_table
+	.byte		ashrsi3_2-ashrsi3_table
+	.byte		ashrsi3_3-ashrsi3_table
+	.byte		ashrsi3_4-ashrsi3_table
+	.byte		ashrsi3_5-ashrsi3_table
+	.byte		ashrsi3_6-ashrsi3_table
+	.byte		ashrsi3_7-ashrsi3_table
+	.byte		ashrsi3_8-ashrsi3_table
+	.byte		ashrsi3_9-ashrsi3_table
+	.byte		ashrsi3_10-ashrsi3_table
+	.byte		ashrsi3_11-ashrsi3_table
+	.byte		ashrsi3_12-ashrsi3_table
+	.byte		ashrsi3_13-ashrsi3_table
+	.byte		ashrsi3_14-ashrsi3_table
+	.byte		ashrsi3_15-ashrsi3_table
+	.byte		ashrsi3_16-ashrsi3_table
+	.byte		ashrsi3_17-ashrsi3_table
+	.byte		ashrsi3_18-ashrsi3_table
+	.byte		ashrsi3_19-ashrsi3_table
+	.byte		ashrsi3_20-ashrsi3_table
+	.byte		ashrsi3_21-ashrsi3_table
+	.byte		ashrsi3_22-ashrsi3_table
+	.byte		ashrsi3_23-ashrsi3_table
+	.byte		ashrsi3_24-ashrsi3_table
+	.byte		ashrsi3_25-ashrsi3_table
+	.byte		ashrsi3_26-ashrsi3_table
+	.byte		ashrsi3_27-ashrsi3_table
+	.byte		ashrsi3_28-ashrsi3_table
+	.byte		ashrsi3_29-ashrsi3_table
+	.byte		ashrsi3_30-ashrsi3_table
+	.byte		ashrsi3_31-ashrsi3_table
+
+ashrsi3_31:
+	rotcl	r0
+	rts
+	subc	r0,r0
+
+ashrsi3_30:
+	shar	r0
+ashrsi3_29:
+	shar	r0
+ashrsi3_28:
+	shar	r0
+ashrsi3_27:
+	shar	r0
+ashrsi3_26:
+	shar	r0
+ashrsi3_25:
+	shar	r0
+ashrsi3_24:
+	shlr16	r0
+	shlr8	r0
+	rts
+	exts.b	r0,r0
+
+ashrsi3_23:
+	shar	r0
+ashrsi3_22:
+	shar	r0
+ashrsi3_21:
+	shar	r0
+ashrsi3_20:
+	shar	r0
+ashrsi3_19:
+	shar	r0
+ashrsi3_18:
+	shar	r0
+ashrsi3_17:
+	shar	r0
+ashrsi3_16:
+	shlr16	r0
+	rts
+	exts.w	r0,r0
+
+ashrsi3_15:
+	shar	r0
+ashrsi3_14:
+	shar	r0
+ashrsi3_13:
+	shar	r0
+ashrsi3_12:
+	shar	r0
+ashrsi3_11:
+	shar	r0
+ashrsi3_10:
+	shar	r0
+ashrsi3_9:
+	shar	r0
+ashrsi3_8:
+	shar	r0
+ashrsi3_7:
+	shar	r0
+ashrsi3_6:
+	shar	r0
+ashrsi3_5:
+	shar	r0
+ashrsi3_4:
+	shar	r0
+ashrsi3_3:
+	shar	r0
+ashrsi3_2:
+	shar	r0
+ashrsi3_1:
+	rts
+	shar	r0
+
+ashrsi3_0:
+	rts
+	nop