1/* mc68020 __mpn_mul_1 -- Multiply a limb vector with a limb and store 2 * the result in a second limb vector. 3 * 4 * Copyright (C) 1992, 1994, 1996, 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 32#include "sysdep.h" 33#include "asm-syntax.h" 34 35 36/******************* 37 * mpi_limb_t 38 * _gcry_mpih_mul_1( mpi_ptr_t res_ptr, (sp + 4) 39 * mpi_ptr_t s1_ptr, (sp + 8) 40 * mpi_size_t s1_size, (sp + 12) 41 * mpi_limb_t s2_limb) (sp + 16) 42 */ 43 44 45 TEXT 46 ALIGN 47 GLOBL C_SYMBOL_NAME(_gcry_mpih_mul_1) 48 49C_SYMBOL_NAME(_gcry_mpih_mul_1:) 50PROLOG(_gcry_mpih_mul_1) 51 52#define res_ptr a0 53#define s1_ptr a1 54#define s1_size d2 55#define s2_limb d4 56 57/* Save used registers on the stack. */ 58 moveml R(d2)-R(d4),MEM_PREDEC(sp) 59#if 0 60 movel R(d2),MEM_PREDEC(sp) 61 movel R(d3),MEM_PREDEC(sp) 62 movel R(d4),MEM_PREDEC(sp) 63#endif 64 65/* Copy the arguments to registers. Better use movem? */ 66 movel MEM_DISP(sp,16),R(res_ptr) 67 movel MEM_DISP(sp,20),R(s1_ptr) 68 movel MEM_DISP(sp,24),R(s1_size) 69 movel MEM_DISP(sp,28),R(s2_limb) 70 71 eorw #1,R(s1_size) 72 clrl R(d1) 73 lsrl #1,R(s1_size) 74 bcc L(L1) 75 subql #1,R(s1_size) 76 subl R(d0),R(d0) /* (d0,cy) <= (0,0) */ 77 78L(Loop:) 79 movel MEM_POSTINC(s1_ptr),R(d3) 80 mulul R(s2_limb),R(d1):R(d3) 81 addxl R(d0),R(d3) 82 movel R(d3),MEM_POSTINC(res_ptr) 83L(L1:) movel MEM_POSTINC(s1_ptr),R(d3) 84 mulul R(s2_limb),R(d0):R(d3) 85 addxl R(d1),R(d3) 86 movel R(d3),MEM_POSTINC(res_ptr) 87 88 dbf R(s1_size),L(Loop) 89 clrl R(d3) 90 addxl R(d3),R(d0) 91 subl #0x10000,R(s1_size) 92 bcc L(Loop) 93 94/* Restore used registers from stack frame. */ 95 moveml MEM_POSTINC(sp),R(d2)-R(d4) 96#if 0 97 movel MEM_POSTINC(sp),R(d4) 98 movel MEM_POSTINC(sp),R(d3) 99 movel MEM_POSTINC(sp),R(d2) 100#endif 101 rts 102EPILOG(_gcry_mpih_mul_1) 103 104 105