2002-06-29 14:15:02 +00:00
|
|
|
/* PowerPC-32 lshift
|
2007-10-23 10:48:09 +00:00
|
|
|
* Copyright (C) 1995, 1996, 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_lshift( 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_lshift
|
|
|
|
|
.globl .mpihelp_lshift
|
|
|
|
|
.csect mpihelp_lshift[DS]
|
|
|
|
|
mpihelp_lshift:
|
|
|
|
|
.long .mpihelp_lshift, TOC[tc0], 0
|
|
|
|
|
.csect .text[PR]
|
|
|
|
|
.mpihelp_lshift:
|
|
|
|
|
mtctr 5 # copy size into CTR
|
|
|
|
|
slwi 0,5,2
|
|
|
|
|
add 7,3,0 # make r7 point at end of res
|
|
|
|
|
add 4,4,0 # make r4 point at end of s1
|
|
|
|
|
subfic 8,6,32
|
|
|
|
|
lwzu 11,-4(4) # load first s1 limb
|
|
|
|
|
srw 3,11,8 # compute function return value
|
|
|
|
|
bdz Lend1
|
|
|
|
|
|
|
|
|
|
Loop: lwzu 10,-4(4)
|
|
|
|
|
slw 9,11,6
|
|
|
|
|
srw 12,10,8
|
|
|
|
|
or 9,9,12
|
|
|
|
|
stwu 9,-4(7)
|
|
|
|
|
bdz Lend2
|
|
|
|
|
lwzu 11,-4(4)
|
|
|
|
|
slw 9,10,6
|
|
|
|
|
srw 12,11,8
|
|
|
|
|
or 9,9,12
|
|
|
|
|
stwu 9,-4(7)
|
|
|
|
|
bdnz Loop
|
|
|
|
|
|
|
|
|
|
Lend1: slw 0,11,6
|
|
|
|
|
stw 0,-4(7)
|
|
|
|
|
blr
|
|
|
|
|
|
|
|
|
|
Lend2: slw 0,10,6
|
|
|
|
|
stw 0,-4(7)
|
|
|
|
|
blr
|
|
|
|
|
|
|
|
|
|
#else
|
2007-10-23 10:48:09 +00:00
|
|
|
|
2002-06-29 14:15:02 +00:00
|
|
|
/* mp_limb_t mpn_lshift (mp_ptr wp, mp_srcptr up, mp_size_t usize,
|
|
|
|
|
unsigned int cnt) */
|
|
|
|
|
|
|
|
|
|
EALIGN(mpihelp_lshift,3,0)
|
|
|
|
|
mtctr %r5 # copy size into CTR
|
|
|
|
|
cmplwi %cr0,%r5,16 # is size < 16
|
|
|
|
|
slwi %r0,%r5,2
|
|
|
|
|
add %r7,%r3,%r0 # make r7 point at end of res
|
|
|
|
|
add %r4,%r4,%r0 # make r4 point at end of s1
|
|
|
|
|
lwzu %r11,-4(%r4) # load first s1 limb
|
|
|
|
|
subfic %r8,%r6,32
|
|
|
|
|
srw %r3,%r11,%r8 # compute function return value
|
|
|
|
|
bge %cr0,L(big) # branch if size >= 16
|
|
|
|
|
|
|
|
|
|
bdz L(end1)
|
|
|
|
|
|
|
|
|
|
0: lwzu %r10,-4(%r4)
|
|
|
|
|
slw %r9,%r11,%r6
|
|
|
|
|
srw %r12,%r10,%r8
|
|
|
|
|
or %r9,%r9,%r12
|
|
|
|
|
stwu %r9,-4(%r7)
|
|
|
|
|
bdz L(end2)
|
|
|
|
|
lwzu %r11,-4(%r4)
|
|
|
|
|
slw %r9,%r10,%r6
|
|
|
|
|
srw %r12,%r11,%r8
|
|
|
|
|
or %r9,%r9,%r12
|
|
|
|
|
stwu %r9,-4(%r7)
|
|
|
|
|
bdnz 0b
|
|
|
|
|
|
|
|
|
|
L(end1):slw %r0,%r11,%r6
|
|
|
|
|
stw %r0,-4(%r7)
|
|
|
|
|
blr
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
/* Guaranteed not to succeed. */
|
|
|
|
|
L(boom): tweq %r0,%r0
|
|
|
|
|
|
|
|
|
|
/* We imitate a case statement, by using (yuk!) fixed-length code chunks,
|
|
|
|
|
of size 4*12 bytes. We have to do this (or something) to make this PIC. */
|
|
|
|
|
L(big): mflr %r9
|
|
|
|
|
bltl- %cr0,L(boom) # Never taken, only used to set LR.
|
|
|
|
|
slwi %r10,%r6,4
|
|
|
|
|
mflr %r12
|
|
|
|
|
add %r10,%r12,%r10
|
|
|
|
|
slwi %r8,%r6,5
|
|
|
|
|
add %r10,%r8,%r10
|
|
|
|
|
mtctr %r10
|
|
|
|
|
addi %r5,%r5,-1
|
|
|
|
|
mtlr %r9
|
|
|
|
|
bctr
|
|
|
|
|
|
|
|
|
|
L(end2):slw %r0,%r10,%r6
|
|
|
|
|
stw %r0,-4(%r7)
|
|
|
|
|
blr
|
|
|
|
|
|
|
|
|
|
#define DO_LSHIFT(n) \
|
|
|
|
|
mtctr %r5; \
|
|
|
|
|
0: lwzu %r10,-4(%r4); \
|
|
|
|
|
slwi %r9,%r11,n; \
|
|
|
|
|
inslwi %r9,%r10,n,32-n; \
|
|
|
|
|
stwu %r9,-4(%r7); \
|
|
|
|
|
bdz- L(end2); \
|
|
|
|
|
lwzu %r11,-4(%r4); \
|
|
|
|
|
slwi %r9,%r10,n; \
|
|
|
|
|
inslwi %r9,%r11,n,32-n; \
|
|
|
|
|
stwu %r9,-4(%r7); \
|
|
|
|
|
bdnz 0b; \
|
|
|
|
|
b L(end1)
|
|
|
|
|
|
|
|
|
|
DO_LSHIFT(1)
|
|
|
|
|
DO_LSHIFT(2)
|
|
|
|
|
DO_LSHIFT(3)
|
|
|
|
|
DO_LSHIFT(4)
|
|
|
|
|
DO_LSHIFT(5)
|
|
|
|
|
DO_LSHIFT(6)
|
|
|
|
|
DO_LSHIFT(7)
|
|
|
|
|
DO_LSHIFT(8)
|
|
|
|
|
DO_LSHIFT(9)
|
|
|
|
|
DO_LSHIFT(10)
|
|
|
|
|
DO_LSHIFT(11)
|
|
|
|
|
DO_LSHIFT(12)
|
|
|
|
|
DO_LSHIFT(13)
|
|
|
|
|
DO_LSHIFT(14)
|
|
|
|
|
DO_LSHIFT(15)
|
|
|
|
|
DO_LSHIFT(16)
|
|
|
|
|
DO_LSHIFT(17)
|
|
|
|
|
DO_LSHIFT(18)
|
|
|
|
|
DO_LSHIFT(19)
|
|
|
|
|
DO_LSHIFT(20)
|
|
|
|
|
DO_LSHIFT(21)
|
|
|
|
|
DO_LSHIFT(22)
|
|
|
|
|
DO_LSHIFT(23)
|
|
|
|
|
DO_LSHIFT(24)
|
|
|
|
|
DO_LSHIFT(25)
|
|
|
|
|
DO_LSHIFT(26)
|
|
|
|
|
DO_LSHIFT(27)
|
|
|
|
|
DO_LSHIFT(28)
|
|
|
|
|
DO_LSHIFT(29)
|
|
|
|
|
DO_LSHIFT(30)
|
|
|
|
|
DO_LSHIFT(31)
|
|
|
|
|
|
|
|
|
|
END(mpihelp_lshift)
|
|
|
|
|
#endif
|
