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100 lines
2.7 KiB
ArmAsm
100 lines
2.7 KiB
ArmAsm
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/* mc68020 __mpn_submul_1 -- Multiply a limb vector with a limb and subtract
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* the result from a second limb vector.
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*
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* Copyright (C) 1992, 1994, 1996, 1998,
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* 2001 Free Software Foundation, Inc.
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*
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* This file is part of GnuPG.
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*
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* GnuPG is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* GnuPG is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*
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* Note: This code is heavily based on the GNU MP Library.
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* Actually it's the same code with only minor changes in the
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* way the data is stored; this is to support the abstraction
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* of an optional secure memory allocation which may be used
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* to avoid revealing of sensitive data due to paging etc.
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* The GNU MP Library itself is published under the LGPL;
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* however I decided to publish this code under the plain GPL.
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*/
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#include "sysdep.h"
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#include "asm-syntax.h"
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/*******************
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* mpi_limb_t
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* mpihelp_submul_1( mpi_ptr_t res_ptr, (sp + 4)
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* mpi_ptr_t s1_ptr, (sp + 8)
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* mpi_size_t s1_size, (sp + 12)
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* mpi_limb_t s2_limb) (sp + 16)
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*/
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TEXT
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ALIGN
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GLOBL C_SYMBOL_NAME(mpihelp_submul_1)
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C_SYMBOL_NAME(mpihelp_submul_1:)
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PROLOG(mpihelp_submul_1)
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#define res_ptr a0
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#define s1_ptr a1
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#define s1_size d2
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#define s2_limb d4
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/* Save used registers on the stack. */
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moveml R(d2)-R(d5),MEM_PREDEC(sp)
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/* Copy the arguments to registers. Better use movem? */
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movel MEM_DISP(sp,20),R(res_ptr)
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movel MEM_DISP(sp,24),R(s1_ptr)
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movel MEM_DISP(sp,28),R(s1_size)
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movel MEM_DISP(sp,32),R(s2_limb)
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eorw #1,R(s1_size)
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clrl R(d1)
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clrl R(d5)
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lsrl #1,R(s1_size)
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bcc L(L1)
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subql #1,R(s1_size)
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subl R(d0),R(d0) /* (d0,cy) <= (0,0) */
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L(Loop:)
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movel MEM_POSTINC(s1_ptr),R(d3)
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mulul R(s2_limb),R(d1):R(d3)
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addxl R(d0),R(d3)
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addxl R(d5),R(d1)
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subl R(d3),MEM_POSTINC(res_ptr)
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L(L1:) movel MEM_POSTINC(s1_ptr),R(d3)
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mulul R(s2_limb),R(d0):R(d3)
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addxl R(d1),R(d3)
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addxl R(d5),R(d0)
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subl R(d3),MEM_POSTINC(res_ptr)
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dbf R(s1_size),L(Loop)
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addxl R(d5),R(d0)
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subl #0x10000,R(s1_size)
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bcc L(Loop)
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/* Restore used registers from stack frame. */
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moveml MEM_POSTINC(sp),R(d2)-R(d5)
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rts
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EPILOG(mpihelp_submul_1)
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