| /* mc68020 __mpn_mul_1 -- Multiply a limb vector with a limb and store |
| * the result in a second limb vector. |
| * |
| * Copyright (C) 1992, 1994, 1996, 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_mul_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) |
| */ |
| |
| |
| TEXT |
| ALIGN |
| GLOBL C_SYMBOL_NAME(_gcry_mpih_mul_1) |
| |
| C_SYMBOL_NAME(_gcry_mpih_mul_1:) |
| PROLOG(_gcry_mpih_mul_1) |
| |
| #define res_ptr a0 |
| #define s1_ptr a1 |
| #define s1_size d2 |
| #define s2_limb d4 |
| |
| /* Save used registers on the stack. */ |
| moveml R(d2)-R(d4),MEM_PREDEC(sp) |
| #if 0 |
| movel R(d2),MEM_PREDEC(sp) |
| movel R(d3),MEM_PREDEC(sp) |
| movel R(d4),MEM_PREDEC(sp) |
| #endif |
| |
| /* Copy the arguments to registers. Better use movem? */ |
| movel MEM_DISP(sp,16),R(res_ptr) |
| movel MEM_DISP(sp,20),R(s1_ptr) |
| movel MEM_DISP(sp,24),R(s1_size) |
| movel MEM_DISP(sp,28),R(s2_limb) |
| |
| eorw #1,R(s1_size) |
| clrl R(d1) |
| lsrl #1,R(s1_size) |
| bcc L(L1) |
| subql #1,R(s1_size) |
| subl R(d0),R(d0) /* (d0,cy) <= (0,0) */ |
| |
| L(Loop:) |
| movel MEM_POSTINC(s1_ptr),R(d3) |
| mulul R(s2_limb),R(d1):R(d3) |
| addxl R(d0),R(d3) |
| movel R(d3),MEM_POSTINC(res_ptr) |
| L(L1:) movel MEM_POSTINC(s1_ptr),R(d3) |
| mulul R(s2_limb),R(d0):R(d3) |
| addxl R(d1),R(d3) |
| movel R(d3),MEM_POSTINC(res_ptr) |
| |
| dbf R(s1_size),L(Loop) |
| clrl R(d3) |
| addxl R(d3),R(d0) |
| subl #0x10000,R(s1_size) |
| bcc L(Loop) |
| |
| /* Restore used registers from stack frame. */ |
| moveml MEM_POSTINC(sp),R(d2)-R(d4) |
| #if 0 |
| movel MEM_POSTINC(sp),R(d4) |
| movel MEM_POSTINC(sp),R(d3) |
| movel MEM_POSTINC(sp),R(d2) |
| #endif |
| rts |
| EPILOG(_gcry_mpih_mul_1) |
| |
| |
