1/* i80386 mul_1 -- Multiply a limb vector with a limb and store 2 * the result in a second limb vector. 3 * Copyright (C) 1992, 1994, 1998, 4 * 2001, 2002 Free Software Foundation, Inc. 5 * 6 * This file is part of Libgcrypt. 7 * 8 * Libgcrypt is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU Lesser General Public License as 10 * published by the Free Software Foundation; either version 2.1 of 11 * the License, or (at your option) any later version. 12 * 13 * Libgcrypt is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU Lesser General Public License for more details. 17 * 18 * You should have received a copy of the GNU Lesser General Public 19 * License along with this program; if not, write to the Free Software 20 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA 21 * 22 * Note: This code is heavily based on the GNU MP Library. 23 * Actually it's the same code with only minor changes in the 24 * way the data is stored; this is to support the abstraction 25 * of an optional secure memory allocation which may be used 26 * to avoid revealing of sensitive data due to paging etc. 27 */ 28 29 30#include "sysdep.h" 31#include "asm-syntax.h" 32 33 34/******************* 35 * mpi_limb_t 36 * _gcry_mpih_mul_1( mpi_ptr_t res_ptr, (sp + 4) 37 * mpi_ptr_t s1_ptr, (sp + 8) 38 * mpi_size_t s1_size, (sp + 12) 39 * mpi_limb_t s2_limb) (sp + 16) 40 */ 41 42#define res_ptr edi 43#define s1_ptr esi 44#define size ecx 45#define s2_limb ebp 46 47 TEXT 48 ALIGN (3) 49 GLOBL C_SYMBOL_NAME(_gcry_mpih_mul_1) 50C_SYMBOL_NAME(_gcry_mpih_mul_1:) 51 52 INSN1(push,l ,R(edi)) 53 INSN1(push,l ,R(esi)) 54 INSN1(push,l ,R(ebx)) 55 INSN1(push,l ,R(ebp)) 56 57 INSN2(mov,l ,R(res_ptr),MEM_DISP(esp,20)) 58 INSN2(mov,l ,R(s1_ptr),MEM_DISP(esp,24)) 59 INSN2(mov,l ,R(size),MEM_DISP(esp,28)) 60 INSN2(mov,l ,R(s2_limb),MEM_DISP(esp,32)) 61 62 INSN2(lea,l ,R(res_ptr),MEM_INDEX(res_ptr,size,4)) 63 INSN2(lea,l ,R(s1_ptr),MEM_INDEX(s1_ptr,size,4)) 64 INSN1(neg,l ,R(size)) 65 INSN2(xor,l ,R(ebx),R(ebx)) 66 ALIGN (3) 67Loop: 68 INSN2(mov,l ,R(eax),MEM_INDEX(s1_ptr,size,4)) 69 INSN1(mul,l ,R(s2_limb)) 70 INSN2(add,l ,R(eax),R(ebx)) 71 INSN2(mov,l ,MEM_INDEX(res_ptr,size,4),R(eax)) 72 INSN2(adc,l ,R(edx),$0) 73 INSN2(mov,l ,R(ebx),R(edx)) 74 75 INSN1(inc,l ,R(size)) 76 INSN1(jnz, ,Loop) 77 INSN2(mov,l ,R(eax),R(ebx)) 78 79 INSN1(pop,l ,R(ebp)) 80 INSN1(pop,l ,R(ebx)) 81 INSN1(pop,l ,R(esi)) 82 INSN1(pop,l ,R(edi)) 83 ret 84 85