2002-06-29 14:15:02 +00:00
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/* i80586 submul_1 -- Multiply a limb vector with a limb and add
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* the result to a second limb vector.
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*
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* Copyright (C) 1992, 1994, 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_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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#define res_ptr edi
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#define s1_ptr esi
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#define size ecx
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#define s2_limb ebp
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TEXT
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ALIGN (3)
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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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INSN1(push,l ,R(edi))
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INSN1(push,l ,R(esi))
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INSN1(push,l ,R(ebx))
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INSN1(push,l ,R(ebp))
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INSN2(mov,l ,R(res_ptr),MEM_DISP(esp,20))
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INSN2(mov,l ,R(s1_ptr),MEM_DISP(esp,24))
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INSN2(mov,l ,R(size),MEM_DISP(esp,28))
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INSN2(mov,l ,R(s2_limb),MEM_DISP(esp,32))
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INSN2(lea,l ,R(res_ptr),MEM_INDEX(res_ptr,size,4))
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INSN2(lea,l ,R(s1_ptr),MEM_INDEX(s1_ptr,size,4))
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INSN1(neg,l ,R(size))
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INSN2(xor,l ,R(ebx),R(ebx))
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ALIGN (3)
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Loop: INSN2(adc,l ,R(ebx),$0)
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INSN2(mov,l ,R(eax),MEM_INDEX(s1_ptr,size,4))
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INSN1(mul,l ,R(s2_limb))
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INSN2(add,l ,R(eax),R(ebx))
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INSN2(mov,l ,R(ebx),MEM_INDEX(res_ptr,size,4))
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INSN2(adc,l ,R(edx),$0)
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INSN2(sub,l ,R(ebx),R(eax))
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INSN2(mov,l ,MEM_INDEX(res_ptr,size,4),R(ebx))
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INSN1(inc,l ,R(size))
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INSN2(mov,l ,R(ebx),R(edx))
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INSN1(jnz, ,Loop)
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INSN2(adc,l ,R(ebx),$0)
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INSN2(mov,l ,R(eax),R(ebx))
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INSN1(pop,l ,R(ebp))
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INSN1(pop,l ,R(ebx))
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INSN1(pop,l ,R(esi))
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INSN1(pop,l ,R(edi))
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ret
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