2002-06-29 14:15:02 +00:00
|
|
|
/* PowerPC-32 rshift
|
2007-10-23 10:48:09 +00:00
|
|
|
* Copyright (C) 1995, 1997, 1998 Free Software Foundation, Inc.
|
2002-06-29 14:15:02 +00:00
|
|
|
*
|
|
|
|
|
* This file is part of GnuPG.
|
|
|
|
|
*
|
|
|
|
|
* GnuPG is free software; you can redistribute it and/or modify
|
|
|
|
|
* it under the terms of the GNU General Public License as published by
|
2007-10-23 10:48:09 +00:00
|
|
|
* the Free Software Foundation; either version 3 of the License, or
|
2002-06-29 14:15:02 +00:00
|
|
|
* (at your option) any later version.
|
|
|
|
|
*
|
|
|
|
|
* GnuPG 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
|
2007-10-23 10:48:09 +00:00
|
|
|
* along with this program; if not, see <http://www.gnu.org/licenses/>.
|
2002-06-29 14:15:02 +00:00
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
#include "sysdep.h"
|
|
|
|
|
#include "asm-syntax.h"
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
#ifndef USE_PPC_PATCHES
|
|
|
|
|
|
|
|
|
|
/*******************
|
|
|
|
|
* mpi_limb_t
|
|
|
|
|
* mpihelp_rshift( mpi_ptr_t wp, (r3)
|
|
|
|
|
* mpi_ptr_t up, (r4)
|
|
|
|
|
* mpi_size_t usize, (r5)
|
|
|
|
|
* unsigned cnt) (r6)
|
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
.toc
|
|
|
|
|
.csect .text[PR]
|
|
|
|
|
.align 2
|
|
|
|
|
.globl mpihelp_rshift
|
|
|
|
|
.globl .mpihelp_rshift
|
|
|
|
|
.csect mpihelp_rshift[DS]
|
|
|
|
|
mpihelp_rshift:
|
|
|
|
|
.long .mpihelp_rshift, TOC[tc0], 0
|
|
|
|
|
.csect .text[PR]
|
|
|
|
|
.mpihelp_rshift:
|
|
|
|
|
mtctr 5 # copy size into CTR
|
|
|
|
|
addi 7,3,-4 # move adjusted res_ptr to free return reg
|
|
|
|
|
subfic 8,6,32
|
|
|
|
|
lwz 11,0(4) # load first s1 limb
|
|
|
|
|
slw 3,11,8 # compute function return value
|
|
|
|
|
bdz Lend1
|
|
|
|
|
|
|
|
|
|
Loop: lwzu 10,4(4)
|
|
|
|
|
srw 9,11,6
|
|
|
|
|
slw 12,10,8
|
|
|
|
|
or 9,9,12
|
|
|
|
|
stwu 9,4(7)
|
|
|
|
|
bdz Lend2
|
|
|
|
|
lwzu 11,4(4)
|
|
|
|
|
srw 9,10,6
|
|
|
|
|
slw 12,11,8
|
|
|
|
|
or 9,9,12
|
|
|
|
|
stwu 9,4(7)
|
|
|
|
|
bdnz Loop
|
|
|
|
|
|
|
|
|
|
Lend1: srw 0,11,6
|
|
|
|
|
stw 0,4(7)
|
|
|
|
|
blr
|
|
|
|
|
|
|
|
|
|
Lend2: srw 0,10,6
|
|
|
|
|
stw 0,4(7)
|
|
|
|
|
blr
|
|
|
|
|
|
|
|
|
|
#else
|
|
|
|
|
|
|
|
|
|
/* INPUT PARAMETERS
|
|
|
|
|
res_ptr r3
|
|
|
|
|
s1_ptr r4
|
|
|
|
|
size r5
|
|
|
|
|
cnt r6 */
|
|
|
|
|
|
|
|
|
|
ENTRY(mpihelp_rshift)
|
|
|
|
|
mtctr 5 # copy size into CTR
|
|
|
|
|
addi 7,3,-4 # move adjusted res_ptr to free return reg
|
|
|
|
|
subfic 8,6,32
|
|
|
|
|
lwz 11,0(4) # load first s1 limb
|
|
|
|
|
slw 3,11,8 # compute function return value
|
|
|
|
|
bdz 1f
|
|
|
|
|
|
|
|
|
|
0: lwzu 10,4(4)
|
|
|
|
|
srw 9,11,6
|
|
|
|
|
slw 12,10,8
|
|
|
|
|
or 9,9,12
|
|
|
|
|
stwu 9,4(7)
|
|
|
|
|
bdz 2f
|
|
|
|
|
lwzu 11,4(4)
|
|
|
|
|
srw 9,10,6
|
|
|
|
|
slw 12,11,8
|
|
|
|
|
or 9,9,12
|
|
|
|
|
stwu 9,4(7)
|
|
|
|
|
bdnz 0b
|
|
|
|
|
|
|
|
|
|
1: srw 0,11,6
|
|
|
|
|
stw 0,4(7)
|
|
|
|
|
blr
|
|
|
|
|
|
|
|
|
|
2: srw 0,10,6
|
|
|
|
|
stw 0,4(7)
|
|
|
|
|
blr
|
|
|
|
|
END(mpihelp_rshift)
|
|
|
|
|
#endif
|
