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/* i80586 submul_1 -- Multiply a limb vector with a limb and add
* the result to a second limb vector.
*
* Copyright (C) 1992, 1994, 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* 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)
*/
#define res_ptr edi
#define s1_ptr esi
#define size ecx
#define s2_limb ebp
TEXT
ALIGN (3)
GLOBL C_SYMBOL_NAME(mpihelp_submul_1)
C_SYMBOL_NAME(mpihelp_submul_1:)
INSN1(push,l ,R(edi))
INSN1(push,l ,R(esi))
INSN1(push,l ,R(ebx))
INSN1(push,l ,R(ebp))
INSN2(mov,l ,R(res_ptr),MEM_DISP(esp,20))
INSN2(mov,l ,R(s1_ptr),MEM_DISP(esp,24))
INSN2(mov,l ,R(size),MEM_DISP(esp,28))
INSN2(mov,l ,R(s2_limb),MEM_DISP(esp,32))
INSN2(lea,l ,R(res_ptr),MEM_INDEX(res_ptr,size,4))
INSN2(lea,l ,R(s1_ptr),MEM_INDEX(s1_ptr,size,4))
INSN1(neg,l ,R(size))
INSN2(xor,l ,R(ebx),R(ebx))
ALIGN (3)
Loop: INSN2(adc,l ,R(ebx),$0)
INSN2(mov,l ,R(eax),MEM_INDEX(s1_ptr,size,4))
INSN1(mul,l ,R(s2_limb))
INSN2(add,l ,R(eax),R(ebx))
INSN2(mov,l ,R(ebx),MEM_INDEX(res_ptr,size,4))
INSN2(adc,l ,R(edx),$0)
INSN2(sub,l ,R(ebx),R(eax))
INSN2(mov,l ,MEM_INDEX(res_ptr,size,4),R(ebx))
INSN1(inc,l ,R(size))
INSN2(mov,l ,R(ebx),R(edx))
INSN1(jnz, ,Loop)
INSN2(adc,l ,R(ebx),$0)
INSN2(mov,l ,R(eax),R(ebx))
INSN1(pop,l ,R(ebp))
INSN1(pop,l ,R(ebx))
INSN1(pop,l ,R(esi))
INSN1(pop,l ,R(edi))
ret
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