diff options
Diffstat (limited to 'grub-core/lib/libgcrypt/mpi/m68k/mc68020/mpih-mul1.S')
| -rw-r--r-- | grub-core/lib/libgcrypt/mpi/m68k/mc68020/mpih-mul1.S | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/grub-core/lib/libgcrypt/mpi/m68k/mc68020/mpih-mul1.S b/grub-core/lib/libgcrypt/mpi/m68k/mc68020/mpih-mul1.S new file mode 100644 index 0000000..007c94c --- /dev/null +++ b/grub-core/lib/libgcrypt/mpi/m68k/mc68020/mpih-mul1.S @@ -0,0 +1,104 @@ +/* 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) + + |