mpi_x86.s

来自「支持SSL v2/v3, TLS, PKCS #5, PKCS #7, PKCS」· S 代码 · 共 333 行

 #
 # 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: mpi_x86.s,v 1.2 2000/08/31 03:45:39 nelsonb%netscape.com Exp $
 #

.text

 #  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
.globl	s_mpv_mul_d
.type	s_mpv_mul_d,@function
s_mpv_mul_d:
    push   %ebp
    mov    %esp,%ebp
    sub    $28,%esp
    push   %edi
    push   %esi
    movl   $0,%ebx		# carry = 0
    mov    12(%ebp),%ecx	# ecx = a_len
    mov    20(%ebp),%edi
    cmp    $0,%ecx
    je     2f			# jmp if a_len == 0
    mov    8(%ebp),%esi		# esi = a
    cld
1:
    lodsl			# eax = [ds:esi]; esi += 4
    mov    16(%ebp),%edx	# edx = b
    mull   %edx			# edx:eax = Phi:Plo = a_i * b

    add    %ebx,%eax		# add carry (%ebx) to edx:eax
    adc    $0,%edx
    mov    %edx,%ebx		# high half of product becomes next carry

    stosl			# [es:edi] = ax; edi += 4;
    dec    %ecx			# --a_len
    jnz    1b			# jmp if a_len != 0
2:
    mov    %ebx,0(%edi)		# *c = carry
    pop    %esi
    pop    %edi
    leave  
    ret    
    nop

 #  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
.globl	s_mpv_mul_d_add
.type	s_mpv_mul_d_add,@function
s_mpv_mul_d_add:
    push   %ebp
    mov    %esp,%ebp
    sub    $28,%esp
    push   %edi
    push   %esi
    movl   $0,%ebx		# carry = 0
    mov    12(%ebp),%ecx	# ecx = a_len
    mov    20(%ebp),%edi
    cmp    $0,%ecx
    je     4f			# jmp if a_len == 0
    mov    8(%ebp),%esi		# esi = a
    cld
3:
    lodsl			# eax = [ds:esi]; esi += 4
    mov    16(%ebp),%edx	# edx = b
    mull   %edx			# edx:eax = Phi:Plo = a_i * b

    add    %ebx,%eax		# add carry (%ebx) to edx:eax
    adc    $0,%edx
    mov    0(%edi),%ebx		# add in current word from *c
    add    %ebx,%eax		
    adc    $0,%edx
    mov    %edx,%ebx		# high half of product becomes next carry

    stosl			# [es:edi] = ax; edi += 4;
    dec    %ecx			# --a_len
    jnz    3b			# jmp if a_len != 0
4:
    mov    %ebx,0(%edi)		# *c = carry
    pop    %esi
    pop    %edi
    leave  
    ret    
    nop

 #  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
.globl	s_mpv_mul_d_add_prop
.type	s_mpv_mul_d_add_prop,@function
s_mpv_mul_d_add_prop:
    push   %ebp
    mov    %esp,%ebp
    sub    $28,%esp
    push   %edi
    push   %esi
    movl   $0,%ebx		# carry = 0
    mov    12(%ebp),%ecx	# ecx = a_len
    mov    20(%ebp),%edi
    cmp    $0,%ecx
    je     6f			# jmp if a_len == 0
    cld
    mov    8(%ebp),%esi		# esi = a
5:
    lodsl			# eax = [ds:esi]; esi += 4
    mov    16(%ebp),%edx	# edx = b
    mull   %edx			# edx:eax = Phi:Plo = a_i * b

    add    %ebx,%eax		# add carry (%ebx) to edx:eax
    adc    $0,%edx
    mov    0(%edi),%ebx		# add in current word from *c
    add    %ebx,%eax		
    adc    $0,%edx
    mov    %edx,%ebx		# high half of product becomes next carry

    stosl			# [es:edi] = ax; edi += 4;
    dec    %ecx			# --a_len
    jnz    5b			# jmp if a_len != 0
6:
    cmp    $0,%ebx		# is carry zero?
    jz     8f
    mov    0(%edi),%eax		# add in current word from *c
    add	   %ebx,%eax
    stosl			# [es:edi] = ax; edi += 4;
    jnc    8f
7:
    mov    0(%edi),%eax		# add in current word from *c
    adc	   $0,%eax
    stosl			# [es:edi] = ax; edi += 4;
    jc     7b
8:
    pop    %esi
    pop    %edi
    leave  
    ret    
    nop

 #  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

.globl	s_mpv_sqr_add_prop
.type	s_mpv_sqr_add_prop,@function
s_mpv_sqr_add_prop:
     push   %ebp
     mov    %esp,%ebp
     sub    $12,%esp
     push   %edi
     push   %esi
     movl   $0,%ebx		# carry = 0
     mov    12(%ebp),%ecx	# a_len
     mov    16(%ebp),%edi	# edi = ps
     cmp    $0,%ecx
     je     11f			# jump if a_len == 0
     cld
     mov    8(%ebp),%esi	# esi = pa
10:
     lodsl			# %eax = [ds:si]; si += 4;
     mull   %eax

     add    %ebx,%eax		# add "carry"
     adc    $0,%edx
     mov    0(%edi),%ebx
     add    %ebx,%eax		# add low word from result
     mov    4(%edi),%ebx
     stosl			# [es:di] = %eax; di += 4;
     adc    %ebx,%edx		# add high word from result
     movl   $0,%ebx
     mov    %edx,%eax
     adc    $0,%ebx
     stosl			# [es:di] = %eax; di += 4;
     dec    %ecx		# --a_len
     jnz    10b			# jmp if a_len != 0
11:
    cmp    $0,%ebx		# is carry zero?
    jz     14f
    mov    0(%edi),%eax		# add in current word from *c
    add	   %ebx,%eax
    stosl			# [es:edi] = ax; edi += 4;
    jnc    14f
12:
    mov    0(%edi),%eax		# add in current word from *c
    adc	   $0,%eax
    stosl			# [es:edi] = ax; edi += 4;
    jc     12b
14:
    pop    %esi
    pop    %edi
    leave  
    ret    
    nop

 #
 # 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:	return address
 #  esp +  4:	Nhi	argument
 #  esp +  8:	Nlo	argument
 #  esp + 12:	divisor	argument
 #  esp + 16:	qp	argument
 #  esp + 20:   rp	argument
 #  registers:
 # 	eax:
 #	ebx:	carry
 #	ecx:	a_len
 #	edx:
 #	esi:	a ptr
 #	edi:	c ptr
 # 
.globl	s_mpv_div_2dx1d
.type	s_mpv_div_2dx1d,@function
s_mpv_div_2dx1d:
       mov    4(%esp),%edx
       mov    8(%esp),%eax
       mov    12(%esp),%ebx
       div    %ebx
       mov    16(%esp),%ebx
       mov    %eax,0(%ebx)
       mov    20(%esp),%ebx
       mov    %edx,0(%ebx)
       xor    %eax,%eax		# return zero
       ret    
       nop