mirror of
git://git.gnupg.org/gnupg.git
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188 lines
4.0 KiB
NASM
188 lines
4.0 KiB
NASM
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; i80586 rshift
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;
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; Copyright (C) 1992, 1994, 1995, 1996, 1998,
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; 2001 Free Software Foundation, Inc.
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;
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; This file is part of GnuPG.
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;
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; GnuPG is free software; you can redistribute it and/or modify
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; it under the terms of the GNU General Public License as published by
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; the Free Software Foundation; either version 2 of the License, or
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; (at your option) any later version.
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;
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; GnuPG is distributed in the hope that it will be useful,
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; but WITHOUT ANY WARRANTY; without even the implied warranty of
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; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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; GNU General Public License for more details.
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;
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; You should have received a copy of the GNU General Public License
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; along with this program; if not, write to the Free Software
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; Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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;
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; Modified versions of the GPG i586 assembler for use with NASM. This
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; file is part of a native port of Gnu PG for use with Microsoft Visual
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; Studio .net. Ported by Brian Gladman <brg@gladman.uk.net> March 2002.
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global _mpihelp_rshift
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section .text
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align 8
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_mpihelp_rshift:
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push edi
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push esi
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push ebx
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push ebp
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mov edi,[20+esp]
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mov esi,[24+esp]
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mov ebp,[28+esp]
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mov ecx,[32+esp]
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cmp ecx,1
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jne short .1
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lea eax,[4+edi]
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cmp eax,esi
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jnc .6
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lea eax,[edi+ebp*4]
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cmp esi,eax
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jnc .6
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.1:
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mov edx,[esi]
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add esi,4
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xor eax,eax
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shrd eax,edx,cl
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push eax
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dec ebp
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push ebp
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shr ebp,3
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jz short .3
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mov eax, [edi]
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align 4
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.2: mov eax,[28+edi]
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mov ebx,edx
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mov eax,[esi]
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mov edx,[4+esi]
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shrd ebx,eax,cl
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shrd eax,edx,cl
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mov [edi],ebx
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mov [4+edi],eax
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mov ebx,[8+esi]
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mov eax,[12+esi]
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shrd edx,ebx,cl
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shrd ebx,eax,cl
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mov [8+edi],edx
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mov [12+edi],ebx
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mov edx,[16+esi]
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mov ebx,[20+esi]
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shrd eax,edx,cl
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shrd edx,ebx,cl
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mov [16+edi],eax
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mov [20+edi],edx
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mov eax,[24+esi]
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mov edx,[28+esi]
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shrd ebx,eax,cl
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shrd eax,edx,cl
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mov [24+edi],ebx
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mov [28+edi],eax
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add esi,32
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add edi,32
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dec ebp
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jnz short .2
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.3: pop ebp
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and ebp,7
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jz .5
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.4:
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mov eax,[esi]
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shrd edx,eax,cl
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mov [edi],edx
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mov edx,eax
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add esi,4
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add edi,4
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dec ebp
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jnz short .4
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.5: shr edx,cl
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mov [edi],edx
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pop eax
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pop ebp
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pop ebx
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pop esi
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pop edi
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ret
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.6:
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lea edi,[-4+edi+ebp*4]
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lea esi,[-4+esi+ebp*4]
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mov edx,[esi]
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sub esi,4
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dec ebp
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push ebp
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shr ebp,3
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shr edx,1
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inc ebp
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dec ebp
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jz short .8
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mov eax, [edi]
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align 4
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.7: mov eax,[-28+edi]
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mov ebx,edx
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mov eax,[esi]
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mov edx,[-4+esi]
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rcr eax,1
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mov [edi],ebx
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rcr edx,1
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mov [-4+edi],eax
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mov ebx,[-8+esi]
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mov eax,[-12+esi]
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rcr ebx,1
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mov [-8+edi],edx
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rcr eax,1
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mov [-12+edi],ebx
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mov edx,[-16+esi]
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mov ebx,[-20+esi]
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rcr edx,1
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mov [-16+edi],eax
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rcr ebx,1
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mov [-20+edi],edx
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mov eax,[-24+esi]
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mov edx,[-28+esi]
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rcr eax,1
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mov [-24+edi],ebx
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rcr edx,1
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mov [-28+edi],eax
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lea esi,[-32+esi]
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lea edi,[-32+edi]
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dec ebp
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jnz short .7
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.8:
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pop ebp
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sbb eax,eax
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and ebp,7
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jz .10
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add eax,eax
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.9:
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mov ebx,edx
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mov edx,[esi]
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rcr edx,1
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mov [edi],ebx
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lea esi,[-4+esi]
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lea edi,[-4+edi]
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dec ebp
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jnz short .9
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jmp short .11
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.10:add eax,eax
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.11:mov [edi],edx
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mov eax,0
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rcr eax,1
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pop ebp
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pop ebx
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pop esi
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pop edi
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ret
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end
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