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|
;
; mpi_x86.asm - assembly language implementation of s_mpv_ functions.
;
; The contents of this file are subject to the Mozilla Public
; License Version 1.1 (the "License"); you may not use this file
; except in compliance with the License. You may obtain a copy of
; the License at http://www.mozilla.org/MPL/
;
; Software distributed under the License is distributed on an "AS
; IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
; implied. See the License for the specific language governing
; rights and limitations under the License.
;
; The Original Code is the Netscape security libraries.
;
; The Initial Developer of the Original Code is Netscape
; Communications Corporation. Portions created by Netscape are
; Copyright (C) 2000 Netscape Communications Corporation. All
; Rights Reserved.
;
; Contributor(s):
;
; Alternatively, the contents of this file may be used under the
; terms of the GNU General Public License Version 2 or later (the
; "GPL"), in which case the provisions of the GPL are applicable
; instead of those above. If you wish to allow use of your
; version of this file only under the terms of the GPL and not to
; allow others to use your version of this file under the MPL,
; indicate your decision by deleting the provisions above and
; replace them with the notice and other provisions required by
; the GPL. If you do not delete the provisions above, a recipient
; may use your version of this file under either the MPL or the
; GPL.
; $Id$
;
.386p
.MODEL FLAT
ASSUME CS: FLAT, DS: FLAT, SS: FLAT
_TEXT SEGMENT
; ebp - 36: caller's esi
; ebp - 32: caller's edi
; ebp - 28:
; ebp - 24:
; ebp - 20:
; ebp - 16:
; ebp - 12:
; ebp - 8:
; ebp - 4:
; ebp + 0: caller's ebp
; ebp + 4: return address
; ebp + 8: a argument
; ebp + 12: a_len argument
; ebp + 16: b argument
; ebp + 20: c argument
; registers:
; eax:
; ebx: carry
; ecx: a_len
; edx:
; esi: a ptr
; edi: c ptr
public _s_mpv_mul_d
_s_mpv_mul_d PROC NEAR
push ebp
mov ebp,esp
sub esp,28
push edi
push esi
push ebx
mov ebx,0 ; carry = 0
mov ecx,[ebp+12] ; ecx = a_len
mov edi,[ebp+20]
cmp ecx,0
je L_2 ; jmp if a_len == 0
mov esi,[ebp+8] ; esi = a
cld
L_1:
lodsd ; eax = [ds:esi]; esi += 4
mov edx,[ebp+16] ; edx = b
mul edx ; edx:eax = Phi:Plo = a_i * b
add eax,ebx ; add carry (ebx) to edx:eax
adc edx,0
mov ebx,edx ; high half of product becomes next carry
stosd ; [es:edi] = ax; edi += 4;
dec ecx ; --a_len
jnz L_1 ; jmp if a_len != 0
L_2:
mov [edi],ebx ; *c = carry
pop ebx
pop esi
pop edi
leave
ret
nop
_s_mpv_mul_d ENDP
; ebp - 36: caller's esi
; ebp - 32: caller's edi
; ebp - 28:
; ebp - 24:
; ebp - 20:
; ebp - 16:
; ebp - 12:
; ebp - 8:
; ebp - 4:
; ebp + 0: caller's ebp
; ebp + 4: return address
; ebp + 8: a argument
; ebp + 12: a_len argument
; ebp + 16: b argument
; ebp + 20: c argument
; registers:
; eax:
; ebx: carry
; ecx: a_len
; edx:
; esi: a ptr
; edi: c ptr
public _s_mpv_mul_d_add
_s_mpv_mul_d_add PROC NEAR
push ebp
mov ebp,esp
sub esp,28
push edi
push esi
push ebx
mov ebx,0 ; carry = 0
mov ecx,[ebp+12] ; ecx = a_len
mov edi,[ebp+20]
cmp ecx,0
je L_4 ; jmp if a_len == 0
mov esi,[ebp+8] ; esi = a
cld
L_3:
lodsd ; eax = [ds:esi]; esi += 4
mov edx,[ebp+16] ; edx = b
mul edx ; edx:eax = Phi:Plo = a_i * b
add eax,ebx ; add carry (ebx) to edx:eax
adc edx,0
mov ebx,[edi] ; add in current word from *c
add eax,ebx
adc edx,0
mov ebx,edx ; high half of product becomes next carry
stosd ; [es:edi] = ax; edi += 4;
dec ecx ; --a_len
jnz L_3 ; jmp if a_len != 0
L_4:
mov [edi],ebx ; *c = carry
pop ebx
pop esi
pop edi
leave
ret
nop
_s_mpv_mul_d_add ENDP
; ebp - 36: caller's esi
; ebp - 32: caller's edi
; ebp - 28:
; ebp - 24:
; ebp - 20:
; ebp - 16:
; ebp - 12:
; ebp - 8:
; ebp - 4:
; ebp + 0: caller's ebp
; ebp + 4: return address
; ebp + 8: a argument
; ebp + 12: a_len argument
; ebp + 16: b argument
; ebp + 20: c argument
; registers:
; eax:
; ebx: carry
; ecx: a_len
; edx:
; esi: a ptr
; edi: c ptr
public _s_mpv_mul_d_add_prop
_s_mpv_mul_d_add_prop PROC NEAR
push ebp
mov ebp,esp
sub esp,28
push edi
push esi
push ebx
mov ebx,0 ; carry = 0
mov ecx,[ebp+12] ; ecx = a_len
mov edi,[ebp+20]
cmp ecx,0
je L_6 ; jmp if a_len == 0
cld
mov esi,[ebp+8] ; esi = a
L_5:
lodsd ; eax = [ds:esi]; esi += 4
mov edx,[ebp+16] ; edx = b
mul edx ; edx:eax = Phi:Plo = a_i * b
add eax,ebx ; add carry (ebx) to edx:eax
adc edx,0
mov ebx,[edi] ; add in current word from *c
add eax,ebx
adc edx,0
mov ebx,edx ; high half of product becomes next carry
stosd ; [es:edi] = ax; edi += 4;
dec ecx ; --a_len
jnz L_5 ; jmp if a_len != 0
L_6:
cmp ebx,0 ; is carry zero?
jz L_8
mov eax,[edi] ; add in current word from *c
add eax,ebx
stosd ; [es:edi] = ax; edi += 4;
jnc L_8
L_7:
mov eax,[edi] ; add in current word from *c
adc eax,0
stosd ; [es:edi] = ax; edi += 4;
jc L_7
L_8:
pop ebx
pop esi
pop edi
leave
ret
nop
_s_mpv_mul_d_add_prop ENDP
; ebp - 20: caller's esi
; ebp - 16: caller's edi
; ebp - 12:
; ebp - 8: carry
; ebp - 4: a_len local
; ebp + 0: caller's ebp
; ebp + 4: return address
; ebp + 8: pa argument
; ebp + 12: a_len argument
; ebp + 16: ps argument
; ebp + 20:
; registers:
; eax:
; ebx: carry
; ecx: a_len
; edx:
; esi: a ptr
; edi: c ptr
public _s_mpv_sqr_add_prop
_s_mpv_sqr_add_prop PROC NEAR
push ebp
mov ebp,esp
sub esp,12
push edi
push esi
push ebx
mov ebx,0 ; carry = 0
mov ecx,[ebp+12] ; a_len
mov edi,[ebp+16] ; edi = ps
cmp ecx,0
je L_11 ; jump if a_len == 0
cld
mov esi,[ebp+8] ; esi = pa
L_10:
lodsd ; eax = [ds:si]; si += 4;
mul eax
add eax,ebx ; add "carry"
adc edx,0
mov ebx,[edi]
add eax,ebx ; add low word from result
mov ebx,[edi+4]
stosd ; [es:di] = eax; di += 4;
adc edx,ebx ; add high word from result
mov ebx,0
mov eax,edx
adc ebx,0
stosd ; [es:di] = eax; di += 4;
dec ecx ; --a_len
jnz L_10 ; jmp if a_len != 0
L_11:
cmp ebx,0 ; is carry zero?
jz L_14
mov eax,[edi] ; add in current word from *c
add eax,ebx
stosd ; [es:edi] = ax; edi += 4;
jnc L_14
L_12:
mov eax,[edi] ; add in current word from *c
adc eax,0
stosd ; [es:edi] = ax; edi += 4;
jc L_12
L_14:
pop ebx
pop esi
pop edi
leave
ret
nop
_s_mpv_sqr_add_prop ENDP
;
; Divide 64-bit (Nhi,Nlo) by 32-bit divisor, which must be normalized
; so its high bit is 1. This code is from NSPR.
;
; mp_err s_mpv_div_2dx1d(mp_digit Nhi, mp_digit Nlo, mp_digit divisor,
; mp_digit *qp, mp_digit *rp)
; Dump of assembler code for function s_mpv_div_2dx1d:
;
; esp + 0: Caller's ebx
; esp + 4: return address
; esp + 8: Nhi argument
; esp + 12: Nlo argument
; esp + 16: divisor argument
; esp + 20: qp argument
; esp + 24: rp argument
; registers:
; eax:
; ebx: carry
; ecx: a_len
; edx:
; esi: a ptr
; edi: c ptr
;
public _s_mpv_div_2dx1d
_s_mpv_div_2dx1d PROC NEAR
push ebx
mov edx,[esp+8]
mov eax,[esp+12]
mov ebx,[esp+16]
div ebx
mov ebx,[esp+20]
mov [ebx],eax
mov ebx,[esp+24]
mov [ebx],edx
xor eax,eax ; return zero
pop ebx
ret
nop
_s_mpv_div_2dx1d ENDP
_TEXT ENDS
END
|
