original_kernel/arch/sh/lib/movmem.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  */

	.text
	.balign	4
	.global	__movmem
	.global __movstr
	.set __movstr, __movmem	
	/* This would be a lot simpler if r6 contained the byte count
	   minus 64, and we wouldn't be called here for a byte count of 64.  */
__movmem:
	sts.l	pr,@-r15
	shll2	r6
	bsr	__movmemSI52+2
	mov.l	@(48,r5),r0
	.balign	4
movmem_loop: /* Reached with rts */
	mov.l	@(60,r5),r0
	add	#-64,r6
	mov.l	r0,@(60,r4)
	tst	r6,r6
	mov.l	@(56,r5),r0
	bt	movmem_done
	mov.l	r0,@(56,r4)
	cmp/pl	r6
	mov.l	@(52,r5),r0
	add	#64,r5
	mov.l	r0,@(52,r4)
	add	#64,r4
	bt	__movmemSI52
! done all the large groups, do the remainder
! jump to movmem+
	mova	__movmemSI4+4,r0
	add	r6,r0
	jmp	@r0
movmem_done: ! share slot insn, works out aligned.
	lds.l	@r15+,pr
	mov.l	r0,@(56,r4)
	mov.l	@(52,r5),r0
	rts
	mov.l	r0,@(52,r4)
	.balign	4

	.global	__movmemSI64
	.global __movstrSI64
	.set	__movstrSI64, __movmemSI64
__movmemSI64:
	mov.l	@(60,r5),r0
	mov.l	r0,@(60,r4)
	.global	__movmemSI60
	.global __movstrSI60
	.set	__movstrSI60, __movmemSI60
__movmemSI60:
	mov.l	@(56,r5),r0
	mov.l	r0,@(56,r4)
	.global	__movmemSI56
	.global __movstrSI56
	.set	__movstrSI56, __movmemSI56
__movmemSI56:
	mov.l	@(52,r5),r0
	mov.l	r0,@(52,r4)
	.global	__movmemSI52
	.global __movstrSI52
	.set	__movstrSI52, __movmemSI52
__movmemSI52:
	mov.l	@(48,r5),r0
	mov.l	r0,@(48,r4)
	.global	__movmemSI48
	.global	__movstrSI48
	.set	__movstrSI48, __movmemSI48
__movmemSI48:
	mov.l	@(44,r5),r0
	mov.l	r0,@(44,r4)
	.global	__movmemSI44
	.global	__movstrSI44
	.set	__movstrSI44, __movmemSI44
__movmemSI44:
	mov.l	@(40,r5),r0
	mov.l	r0,@(40,r4)
	.global	__movmemSI40
	.global __movstrSI40
	.set	__movstrSI40, __movmemSI40
__movmemSI40:
	mov.l	@(36,r5),r0
	mov.l	r0,@(36,r4)
	.global	__movmemSI36
	.global	__movstrSI36
	.set	__movstrSI36, __movmemSI36
__movmemSI36:
	mov.l	@(32,r5),r0
	mov.l	r0,@(32,r4)
	.global	__movmemSI32
	.global	__movstrSI32
	.set	__movstrSI32, __movmemSI32
__movmemSI32:
	mov.l	@(28,r5),r0
	mov.l	r0,@(28,r4)
	.global	__movmemSI28
	.global	__movstrSI28
	.set	__movstrSI28, __movmemSI28
__movmemSI28:
	mov.l	@(24,r5),r0
	mov.l	r0,@(24,r4)
	.global	__movmemSI24
	.global	__movstrSI24
	.set	__movstrSI24, __movmemSI24
__movmemSI24:
	mov.l	@(20,r5),r0
	mov.l	r0,@(20,r4)
	.global	__movmemSI20
	.global	__movstrSI20
	.set	__movstrSI20, __movmemSI20
__movmemSI20:
	mov.l	@(16,r5),r0
	mov.l	r0,@(16,r4)
	.global	__movmemSI16
	.global	__movstrSI16
	.set	__movstrSI16, __movmemSI16
__movmemSI16:
	mov.l	@(12,r5),r0
	mov.l	r0,@(12,r4)
	.global	__movmemSI12
	.global	__movstrSI12
	.set	__movstrSI12, __movmemSI12
__movmemSI12:
	mov.l	@(8,r5),r0
	mov.l	r0,@(8,r4)
	.global	__movmemSI8
	.global	__movstrSI8
	.set	__movstrSI8, __movmemSI8
__movmemSI8:
	mov.l	@(4,r5),r0
	mov.l	r0,@(4,r4)
	.global	__movmemSI4
	.global	__movstrSI4
	.set	__movstrSI4, __movmemSI4
__movmemSI4:
	mov.l	@(0,r5),r0
	rts
	mov.l	r0,@(0,r4)

	.global	__movmem_i4_even
	.global	__movstr_i4_even
	.set	__movstr_i4_even, __movmem_i4_even

	.global	__movmem_i4_odd
	.global	__movstr_i4_odd
	.set	__movstr_i4_odd, __movmem_i4_odd

	.global	__movmemSI12_i4
	.global	__movstrSI12_i4
	.set	__movstrSI12_i4, __movmemSI12_i4

	.p2align	5
L_movmem_2mod4_end:
	mov.l	r0,@(16,r4)
	rts
	mov.l	r1,@(20,r4)

	.p2align	2

__movmem_i4_even:
	mov.l	@r5+,r0
	bra	L_movmem_start_even
	mov.l	@r5+,r1

__movmem_i4_odd:
	mov.l	@r5+,r1
	add	#-4,r4
	mov.l	@r5+,r2
	mov.l	@r5+,r3
	mov.l	r1,@(4,r4)
	mov.l	r2,@(8,r4)

L_movmem_loop:
	mov.l	r3,@(12,r4)
	dt	r6
	mov.l	@r5+,r0
	bt/s	L_movmem_2mod4_end
	mov.l	@r5+,r1
	add	#16,r4
L_movmem_start_even:
	mov.l	@r5+,r2
	mov.l	@r5+,r3
	mov.l	r0,@r4
	dt	r6
	mov.l	r1,@(4,r4)
	bf/s	L_movmem_loop
	mov.l	r2,@(8,r4)
	rts
	mov.l	r3,@(12,r4)

	.p2align	4
__movmemSI12_i4:
	mov.l	@r5,r0
	mov.l	@(4,r5),r1
	mov.l	@(8,r5),r2
	mov.l	r0,@r4
	mov.l	r1,@(4,r4)
	rts
	mov.l	r2,@(8,r4)