| /* i80386 submul_1 -- Multiply a limb vector with a limb and add |
| * the result to a second limb vector. |
| * |
| * Copyright (C) 1992, 1994, 1998, |
| * 2001, 2002 Free Software Foundation, Inc. |
| * |
| * This file is part of Libgcrypt. |
| * |
| * Libgcrypt is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU Lesser General Public License as |
| * published by the Free Software Foundation; either version 2.1 of |
| * the License, or (at your option) any later version. |
| * |
| * Libgcrypt 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 Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser 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. |
| */ |
| |
| |
| #include "sysdep.h" |
| #include "asm-syntax.h" |
| |
| |
| /******************* |
| * mpi_limb_t |
| * _gcry_mpih_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(_gcry_mpih_submul_1) |
| C_SYMBOL_NAME(_gcry_mpih_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(mov,l ,R(eax),MEM_INDEX(s1_ptr,size,4)) |
| INSN1(mul,l ,R(s2_limb)) |
| INSN2(add,l ,R(eax),R(ebx)) |
| INSN2(adc,l ,R(edx),$0) |
| INSN2(sub,l ,MEM_INDEX(res_ptr,size,4),R(eax)) |
| INSN2(adc,l ,R(edx),$0) |
| INSN2(mov,l ,R(ebx),R(edx)) |
| |
| INSN1(inc,l ,R(size)) |
| INSN1(jnz, ,Loop) |
| 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 |
| |