mirror of
git://git.gnupg.org/gnupg.git
synced 2024-12-23 10:29:58 +01:00
100 lines
2.7 KiB
ArmAsm
100 lines
2.7 KiB
ArmAsm
|
/* mc68020 __mpn_submul_1 -- Multiply a limb vector with a limb and subtract
|
||
|
|
* the result from a second limb vector.
|
||
|
|
*
|
||
|
|
* Copyright (C) 1992, 1994, 1996, 1998,
|
||
|
|
* 2001 Free Software Foundation, Inc.
|
||
|
|
*
|
||
|
|
* 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
|
||
|
|
* the Free Software Foundation; either version 2 of the License, or
|
||
|
|
* (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
|
||
|
|
* along with this program; if not, write to the Free Software
|
||
|
|
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
|
||
|
|
*
|
||
|
|
* Note: This code is heavily based on the GNU MP Library.
|
||
|
|
* Actually it's the same code with only minor changes in the
|
||
|
|
* way the data is stored; this is to support the abstraction
|
||
|
|
* of an optional secure memory allocation which may be used
|
||
|
|
* to avoid revealing of sensitive data due to paging etc.
|
||
|
|
* The GNU MP Library itself is published under the LGPL;
|
||
|
|
* however I decided to publish this code under the plain GPL.
|
||
|
|
*/
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
#include "sysdep.h"
|
||
|
|
#include "asm-syntax.h"
|
||
|
|
|
||
|
|
/*******************
|
||
|
|
* mpi_limb_t
|
||
|
|
* mpihelp_submul_1( mpi_ptr_t res_ptr, (sp + 4)
|
||
|
|
* mpi_ptr_t s1_ptr, (sp + 8)
|
||
|
|
* mpi_size_t s1_size, (sp + 12)
|
||
|
|
* mpi_limb_t s2_limb) (sp + 16)
|
||
|
|
*/
|
||
|
|
|
||
|
|
|
||
|
|
TEXT
|
||
|
|
ALIGN
|
||
|
|
GLOBL C_SYMBOL_NAME(mpihelp_submul_1)
|
||
|
|
|
||
|
|
C_SYMBOL_NAME(mpihelp_submul_1:)
|
||
|
|
PROLOG(mpihelp_submul_1)
|
||
|
|
|
||
|
|
#define res_ptr a0
|
||
|
|
#define s1_ptr a1
|
||
|
|
#define s1_size d2
|
||
|
|
#define s2_limb d4
|
||
|
|
|
||
|
|
/* Save used registers on the stack. */
|
||
|
|
moveml R(d2)-R(d5),MEM_PREDEC(sp)
|
||
|
|
|
||
|
|
/* Copy the arguments to registers. Better use movem? */
|
||
|
|
movel MEM_DISP(sp,20),R(res_ptr)
|
||
|
|
movel MEM_DISP(sp,24),R(s1_ptr)
|
||
|
|
movel MEM_DISP(sp,28),R(s1_size)
|
||
|
|
movel MEM_DISP(sp,32),R(s2_limb)
|
||
|
|
|
||
|
|
eorw #1,R(s1_size)
|
||
|
|
clrl R(d1)
|
||
|
|
clrl R(d5)
|
||
|
|
lsrl #1,R(s1_size)
|
||
|
|
bcc L(L1)
|
||
|
|
subql #1,R(s1_size)
|
||
|
|
subl R(d0),R(d0) /* (d0,cy) <= (0,0) */
|
||
|
|
|
||
|
|
L(Loop:)
|
||
|
|
movel MEM_POSTINC(s1_ptr),R(d3)
|
||
|
|
mulul R(s2_limb),R(d1):R(d3)
|
||
|
|
addxl R(d0),R(d3)
|
||
|
|
addxl R(d5),R(d1)
|
||
|
|
subl R(d3),MEM_POSTINC(res_ptr)
|
||
|
|
L(L1:) movel MEM_POSTINC(s1_ptr),R(d3)
|
||
|
|
mulul R(s2_limb),R(d0):R(d3)
|
||
|
|
addxl R(d1),R(d3)
|
||
|
|
addxl R(d5),R(d0)
|
||
|
|
subl R(d3),MEM_POSTINC(res_ptr)
|
||
|
|
|
||
|
|
dbf R(s1_size),L(Loop)
|
||
|
|
addxl R(d5),R(d0)
|
||
|
|
subl #0x10000,R(s1_size)
|
||
|
|
bcc L(Loop)
|
||
|
|
|
||
|
|
/* Restore used registers from stack frame. */
|
||
|
|
moveml MEM_POSTINC(sp),R(d2)-R(d5)
|
||
|
|
|
||
|
|
rts
|
||
|
|
EPILOG(mpihelp_submul_1)
|
||
|
|
|
||
|
|
|