1/* i80386 submul_1 -- Multiply a limb vector with a limb and add 2 * the result to a second limb vector. 3 * 4 * Copyright (C) 1992, 1994, 1998, 5 * 2001, 2002 Free Software Foundation, Inc. 6 * 7 * This file is part of Libgcrypt. 8 * 9 * Libgcrypt is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU Lesser General Public License as 11 * published by the Free Software Foundation; either version 2.1 of 12 * the License, or (at your option) any later version. 13 * 14 * Libgcrypt is distributed in the hope that it will be useful, 15 * but WITHOUT ANY WARRANTY; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 * GNU Lesser General Public License for more details. 18 * 19 * You should have received a copy of the GNU Lesser General Public 20 * License along with this program; if not, write to the Free Software 21 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA 22 * 23 * Note: This code is heavily based on the GNU MP Library. 24 * Actually it's the same code with only minor changes in the 25 * way the data is stored; this is to support the abstraction 26 * of an optional secure memory allocation which may be used 27 * to avoid revealing of sensitive data due to paging etc. 28 */ 29 30 31#include "sysdep.h" 32#include "asm-syntax.h" 33 34 35/******************* 36 * mpi_limb_t 37 * _gcry_mpih_submul_1( mpi_ptr_t res_ptr, (sp + 4) 38 * mpi_ptr_t s1_ptr, (sp + 8) 39 * mpi_size_t s1_size, (sp + 12) 40 * mpi_limb_t s2_limb) (sp + 16) 41 */ 42 43#define res_ptr edi 44#define s1_ptr esi 45#define size ecx 46#define s2_limb ebp 47 48 TEXT 49 ALIGN (2) 50 GLOBL C_SYMBOL_NAME(_gcry_mpih_submul_1) 51C_SYMBOL_NAME(_gcry_mpih_submul_1:) 52 53 CFI_STARTPROC() 54 INSN1(push,l ,R(edi)) 55 CFI_PUSH(%edi) 56 INSN1(push,l ,R(esi)) 57 CFI_PUSH(%esi) 58 INSN1(push,l ,R(ebx)) 59 CFI_PUSH(%ebx) 60 INSN1(push,l ,R(ebp)) 61 CFI_PUSH(%ebp) 62 63 INSN2(mov,l ,R(res_ptr),MEM_DISP(esp,20)) 64 INSN2(mov,l ,R(s1_ptr),MEM_DISP(esp,24)) 65 INSN2(mov,l ,R(size),MEM_DISP(esp,28)) 66 INSN2(mov,l ,R(s2_limb),MEM_DISP(esp,32)) 67 68 INSN2(lea,l ,R(res_ptr),MEM_INDEX(res_ptr,size,4)) 69 INSN2(lea,l ,R(s1_ptr),MEM_INDEX(s1_ptr,size,4)) 70 INSN1(neg,l ,R(size)) 71 INSN2(xor,l ,R(ebx),R(ebx)) 72 ALIGN (2) 73Loop: 74 INSN2(mov,l ,R(eax),MEM_INDEX(s1_ptr,size,4)) 75 INSN1(mul,l ,R(s2_limb)) 76 INSN2(add,l ,R(eax),R(ebx)) 77 INSN2(adc,l ,R(edx),$0) 78 INSN2(sub,l ,MEM_INDEX(res_ptr,size,4),R(eax)) 79 INSN2(adc,l ,R(edx),$0) 80 INSN2(mov,l ,R(ebx),R(edx)) 81 82 INSN1(inc,l ,R(size)) 83 INSN1(jnz, ,Loop) 84 INSN2(mov,l ,R(eax),R(ebx)) 85 86 INSN1(pop,l ,R(ebp)) 87 CFI_POP(%ebp) 88 INSN1(pop,l ,R(ebx)) 89 CFI_POP(%ebx) 90 INSN1(pop,l ,R(esi)) 91 CFI_POP(%esi) 92 INSN1(pop,l ,R(edi)) 93 CFI_POP(%edi) 94 ret 95 CFI_ENDPROC() 96 97