diff options
Diffstat (limited to 'grub-core/lib/libgcrypt/mpi/m68k/mpih-sub1.S')
| -rw-r--r-- | grub-core/lib/libgcrypt/mpi/m68k/mpih-sub1.S | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/grub-core/lib/libgcrypt/mpi/m68k/mpih-sub1.S b/grub-core/lib/libgcrypt/mpi/m68k/mpih-sub1.S new file mode 100644 index 0000000..ee7555f --- /dev/null +++ b/grub-core/lib/libgcrypt/mpi/m68k/mpih-sub1.S @@ -0,0 +1,91 @@ +/* mc68020 __mpn_sub_n -- Subtract two limb vectors of the same length > 0 and + * store difference in a third 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_sub_n( mpi_ptr_t res_ptr, (sp + 4) + * mpi_ptr_t s1_ptr, (sp + 8) + * mpi_ptr_t s2_ptr, (sp + 16) + * mpi_size_t size) (sp + 12) + */ + + + TEXT + ALIGN + GLOBL C_SYMBOL_NAME(_gcry_mpih_sub_n) + +C_SYMBOL_NAME(_gcry_mpih_sub_n:) +PROLOG(_gcry_mpih_sub_n) +/* Save used registers on the stack. */ + movel R(d2),MEM_PREDEC(sp) + movel R(a2),MEM_PREDEC(sp) + +/* Copy the arguments to registers. Better use movem? */ + movel MEM_DISP(sp,12),R(a2) + movel MEM_DISP(sp,16),R(a0) + movel MEM_DISP(sp,20),R(a1) + movel MEM_DISP(sp,24),R(d2) + + eorw #1,R(d2) + lsrl #1,R(d2) + bcc L(L1) + subql #1,R(d2) /* clears cy as side effect */ + +L(Loop:) + movel MEM_POSTINC(a0),R(d0) + movel MEM_POSTINC(a1),R(d1) + subxl R(d1),R(d0) + movel R(d0),MEM_POSTINC(a2) +L(L1:) movel MEM_POSTINC(a0),R(d0) + movel MEM_POSTINC(a1),R(d1) + subxl R(d1),R(d0) + movel R(d0),MEM_POSTINC(a2) + + dbf R(d2),L(Loop) /* loop until 16 lsb of %4 == -1 */ + subxl R(d0),R(d0) /* d0 <= -cy; save cy as 0 or -1 in d0 */ + subl #0x10000,R(d2) + bcs L(L2) + addl R(d0),R(d0) /* restore cy */ + bra L(Loop) + +L(L2:) + negl R(d0) + +/* Restore used registers from stack frame. */ + movel MEM_POSTINC(sp),R(a2) + movel MEM_POSTINC(sp),R(d2) + + rts +EPILOG(_gcry_mpih_sub_n) + + |