mirror of
https://github.com/acidanthera/audk.git
synced 2025-04-08 17:05:09 +02:00
1a49e2aa3c
REF:https://bugzilla.tianocore.org/show_bug.cgi?id=3679 This dependency is needed to build openssl lib with ECC ciphers under IA32 Windows and adds implementation for _allmul and _allshr instrinsics. It is taken from Project Mu: microsoft/mu_basecore@b55b341 Cc: Jiewen Yao <jiewen.yao@intel.com> Cc: Jian J Wang <jian.j.wang@intel.com> Signed-off-by: yi1 li <yi1.li@intel.com> Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>
99 lines
2.6 KiB
NASM
99 lines
2.6 KiB
NASM
;***
|
|
;llmul.asm - long multiply routine
|
|
;
|
|
; Copyright (c) Microsoft Corporation. All rights reserved.
|
|
; SPDX-License-Identifier: BSD-2-Clause-Patent
|
|
;
|
|
;Purpose:
|
|
; Defines long multiply routine
|
|
; Both signed and unsigned routines are the same, since multiply's
|
|
; work out the same in 2's complement
|
|
; creates the following routine:
|
|
; __allmul
|
|
;
|
|
;Original Implemenation: MSVC 14.12.25827
|
|
;
|
|
;*******************************************************************************
|
|
.686
|
|
.model flat,C
|
|
.code
|
|
|
|
|
|
;***
|
|
;llmul - long multiply routine
|
|
;
|
|
;Purpose:
|
|
; Does a long multiply (same for signed/unsigned)
|
|
; Parameters are not changed.
|
|
;
|
|
;Entry:
|
|
; Parameters are passed on the stack:
|
|
; 1st pushed: multiplier (QWORD)
|
|
; 2nd pushed: multiplicand (QWORD)
|
|
;
|
|
;Exit:
|
|
; EDX:EAX - product of multiplier and multiplicand
|
|
; NOTE: parameters are removed from the stack
|
|
;
|
|
;Uses:
|
|
; ECX
|
|
;
|
|
;Exceptions:
|
|
;
|
|
;*******************************************************************************
|
|
_allmul PROC NEAR
|
|
|
|
A EQU [esp + 4] ; stack address of a
|
|
B EQU [esp + 12] ; stack address of b
|
|
|
|
HIGH_PART EQU [4] ;
|
|
LOW_PART EQU [0]
|
|
|
|
;
|
|
; AHI, BHI : upper 32 bits of A and B
|
|
; ALO, BLO : lower 32 bits of A and B
|
|
;
|
|
; ALO * BLO
|
|
; ALO * BHI
|
|
; + BLO * AHI
|
|
; ---------------------
|
|
;
|
|
|
|
mov eax,HIGH_PART(A)
|
|
mov ecx,HIGH_PART(B)
|
|
or ecx,eax ;test for both high dwords zero.
|
|
mov ecx,LOW_PART(B)
|
|
jnz short hard ;both are zero, just mult ALO and BLO
|
|
|
|
mov eax,LOW_PART(A)
|
|
mul ecx
|
|
|
|
ret 16 ; callee restores the stack
|
|
|
|
hard:
|
|
push ebx
|
|
|
|
; must redefine A and B since esp has been altered
|
|
|
|
A2 EQU [esp + 8] ; stack address of a
|
|
B2 EQU [esp + 16] ; stack address of b
|
|
|
|
mul ecx ;eax has AHI, ecx has BLO, so AHI * BLO
|
|
mov ebx,eax ;save result
|
|
|
|
mov eax,LOW_PART(A2)
|
|
mul dword ptr HIGH_PART(B2) ;ALO * BHI
|
|
add ebx,eax ;ebx = ((ALO * BHI) + (AHI * BLO))
|
|
|
|
mov eax,LOW_PART(A2);ecx = BLO
|
|
mul ecx ;so edx:eax = ALO*BLO
|
|
add edx,ebx ;now edx has all the LO*HI stuff
|
|
|
|
pop ebx
|
|
|
|
ret 16 ; callee restores the stack
|
|
|
|
_allmul ENDP
|
|
|
|
end
|