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; i80586 rshift
;
; Copyright (C) 1992, 1994, 1995, 1996, 1998,
; 2001 Free Software Foundation, Inc.
;
; This file is part of GnuPG.
;
; GnuPG is free software; you can redistribute it and/or modify
; it under the terms of the GNU General Public License as published by
; the Free Software Foundation; either version 2 of the License, or
; (at your option) any later version.
;
; GnuPG 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 General Public License for more details.
;
; You should have received a copy of the GNU 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
;
; Modified versions of the GPG i586 assembler for use with NASM. This
; file is part of a native port of Gnu PG for use with Microsoft Visual
; Studio .net. Ported by Brian Gladman <[email protected]> March 2002.
global _mpihelp_rshift
section .text
align 8
_mpihelp_rshift:
push edi
push esi
push ebx
push ebp
mov edi,[20+esp]
mov esi,[24+esp]
mov ebp,[28+esp]
mov ecx,[32+esp]
cmp ecx,1
jne short .1
lea eax,[4+edi]
cmp eax,esi
jnc .6
lea eax,[edi+ebp*4]
cmp esi,eax
jnc .6
.1:
mov edx,[esi]
add esi,4
xor eax,eax
shrd eax,edx,cl
push eax
dec ebp
push ebp
shr ebp,3
jz short .3
mov eax, [edi]
align 4
.2: mov eax,[28+edi]
mov ebx,edx
mov eax,[esi]
mov edx,[4+esi]
shrd ebx,eax,cl
shrd eax,edx,cl
mov [edi],ebx
mov [4+edi],eax
mov ebx,[8+esi]
mov eax,[12+esi]
shrd edx,ebx,cl
shrd ebx,eax,cl
mov [8+edi],edx
mov [12+edi],ebx
mov edx,[16+esi]
mov ebx,[20+esi]
shrd eax,edx,cl
shrd edx,ebx,cl
mov [16+edi],eax
mov [20+edi],edx
mov eax,[24+esi]
mov edx,[28+esi]
shrd ebx,eax,cl
shrd eax,edx,cl
mov [24+edi],ebx
mov [28+edi],eax
add esi,32
add edi,32
dec ebp
jnz short .2
.3: pop ebp
and ebp,7
jz .5
.4:
mov eax,[esi]
shrd edx,eax,cl
mov [edi],edx
mov edx,eax
add esi,4
add edi,4
dec ebp
jnz short .4
.5: shr edx,cl
mov [edi],edx
pop eax
pop ebp
pop ebx
pop esi
pop edi
ret
.6:
lea edi,[-4+edi+ebp*4]
lea esi,[-4+esi+ebp*4]
mov edx,[esi]
sub esi,4
dec ebp
push ebp
shr ebp,3
shr edx,1
inc ebp
dec ebp
jz short .8
mov eax, [edi]
align 4
.7: mov eax,[-28+edi]
mov ebx,edx
mov eax,[esi]
mov edx,[-4+esi]
rcr eax,1
mov [edi],ebx
rcr edx,1
mov [-4+edi],eax
mov ebx,[-8+esi]
mov eax,[-12+esi]
rcr ebx,1
mov [-8+edi],edx
rcr eax,1
mov [-12+edi],ebx
mov edx,[-16+esi]
mov ebx,[-20+esi]
rcr edx,1
mov [-16+edi],eax
rcr ebx,1
mov [-20+edi],edx
mov eax,[-24+esi]
mov edx,[-28+esi]
rcr eax,1
mov [-24+edi],ebx
rcr edx,1
mov [-28+edi],eax
lea esi,[-32+esi]
lea edi,[-32+edi]
dec ebp
jnz short .7
.8:
pop ebp
sbb eax,eax
and ebp,7
jz .10
add eax,eax
.9:
mov ebx,edx
mov edx,[esi]
rcr edx,1
mov [edi],ebx
lea esi,[-4+esi]
lea edi,[-4+edi]
dec ebp
jnz short .9
jmp short .11
.10:add eax,eax
.11:mov [edi],edx
mov eax,0
rcr eax,1
pop ebp
pop ebx
pop esi
pop edi
ret
end
|
