2002-06-29 14:15:02 +00:00
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/* i80586 sub_n -- Sub two limb vectors of the same length > 0 and store
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* sum in a third limb vector.
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*
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* Copyright (C) 1992, 1994, 1995, 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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2005-05-31 08:39:18 +00:00
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
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* USA.
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2002-06-29 14:15:02 +00:00
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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_sub_n( mpi_ptr_t res_ptr, (sp + 4)
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* mpi_ptr_t s1_ptr, (sp + 8)
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* mpi_ptr_t s2_ptr, (sp + 12)
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* mpi_size_t size) (sp + 16)
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*/
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.text
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ALIGN (3)
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.globl C_SYMBOL_NAME(mpihelp_sub_n)
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C_SYMBOL_NAME(mpihelp_sub_n:)
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pushl %edi
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pushl %esi
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pushl %ebx
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pushl %ebp
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movl 20(%esp),%edi /* res_ptr */
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movl 24(%esp),%esi /* s1_ptr */
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movl 28(%esp),%ebp /* s2_ptr */
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movl 32(%esp),%ecx /* size */
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movl (%ebp),%ebx
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decl %ecx
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movl %ecx,%edx
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shrl $3,%ecx
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andl $7,%edx
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testl %ecx,%ecx /* zero carry flag */
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jz Lend
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pushl %edx
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ALIGN (3)
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Loop: movl 28(%edi),%eax /* fetch destination cache line */
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leal 32(%edi),%edi
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L1: movl (%esi),%eax
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movl 4(%esi),%edx
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sbbl %ebx,%eax
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movl 4(%ebp),%ebx
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sbbl %ebx,%edx
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movl 8(%ebp),%ebx
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movl %eax,-32(%edi)
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movl %edx,-28(%edi)
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L2: movl 8(%esi),%eax
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movl 12(%esi),%edx
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sbbl %ebx,%eax
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movl 12(%ebp),%ebx
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sbbl %ebx,%edx
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movl 16(%ebp),%ebx
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movl %eax,-24(%edi)
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movl %edx,-20(%edi)
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L3: movl 16(%esi),%eax
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movl 20(%esi),%edx
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sbbl %ebx,%eax
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movl 20(%ebp),%ebx
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sbbl %ebx,%edx
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movl 24(%ebp),%ebx
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movl %eax,-16(%edi)
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movl %edx,-12(%edi)
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L4: movl 24(%esi),%eax
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movl 28(%esi),%edx
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sbbl %ebx,%eax
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movl 28(%ebp),%ebx
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sbbl %ebx,%edx
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movl 32(%ebp),%ebx
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movl %eax,-8(%edi)
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movl %edx,-4(%edi)
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leal 32(%esi),%esi
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leal 32(%ebp),%ebp
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decl %ecx
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jnz Loop
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popl %edx
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Lend:
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decl %edx /* test %edx w/o clobbering carry */
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js Lend2
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incl %edx
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Loop2:
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leal 4(%edi),%edi
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movl (%esi),%eax
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sbbl %ebx,%eax
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movl 4(%ebp),%ebx
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movl %eax,-4(%edi)
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leal 4(%esi),%esi
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leal 4(%ebp),%ebp
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decl %edx
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jnz Loop2
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Lend2:
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movl (%esi),%eax
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sbbl %ebx,%eax
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movl %eax,(%edi)
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sbbl %eax,%eax
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negl %eax
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popl %ebp
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popl %ebx
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popl %esi
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popl %edi
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ret
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