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
;***
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;llmul.asm - long multiply routine
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;
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; Copyright (c) Microsoft Corporation. All rights reserved.
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; SPDX-License-Identifier: BSD-2-Clause-Patent
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;
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;Purpose:
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; Defines long multiply routine
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; Both signed and unsigned routines are the same, since multiply's
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; work out the same in 2's complement
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; creates the following routine:
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; __allmul
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;
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;Original Implemenation: MSVC 14.12.25827
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;
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;*******************************************************************************
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.686
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.model flat,C
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.code
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;***
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;llmul - long multiply routine
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;
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;Purpose:
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; Does a long multiply (same for signed/unsigned)
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; Parameters are not changed.
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;
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;Entry:
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; Parameters are passed on the stack:
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; 1st pushed: multiplier (QWORD)
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; 2nd pushed: multiplicand (QWORD)
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;
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;Exit:
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; EDX:EAX - product of multiplier and multiplicand
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; NOTE: parameters are removed from the stack
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;
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;Uses:
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; ECX
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;
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;Exceptions:
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;
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;*******************************************************************************
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_allmul PROC NEAR
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A EQU [esp + 4] ; stack address of a
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B EQU [esp + 12] ; stack address of b
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HIGH_PART EQU [4] ;
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LOW_PART EQU [0]
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;
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; AHI, BHI : upper 32 bits of A and B
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; ALO, BLO : lower 32 bits of A and B
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;
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; ALO * BLO
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; ALO * BHI
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; + BLO * AHI
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; ---------------------
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;
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mov eax,HIGH_PART(A)
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mov ecx,HIGH_PART(B)
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or ecx,eax ;test for both high dwords zero.
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mov ecx,LOW_PART(B)
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jnz short hard ;both are zero, just mult ALO and BLO
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mov eax,LOW_PART(A)
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mul ecx
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ret 16 ; callee restores the stack
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hard:
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push ebx
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; must redefine A and B since esp has been altered
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A2 EQU [esp + 8] ; stack address of a
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B2 EQU [esp + 16] ; stack address of b
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mul ecx ;eax has AHI, ecx has BLO, so AHI * BLO
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mov ebx,eax ;save result
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mov eax,LOW_PART(A2)
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mul dword ptr HIGH_PART(B2) ;ALO * BHI
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add ebx,eax ;ebx = ((ALO * BHI) + (AHI * BLO))
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mov eax,LOW_PART(A2);ecx = BLO
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mul ecx ;so edx:eax = ALO*BLO
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add edx,ebx ;now edx has all the LO*HI stuff
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pop ebx
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ret 16 ; callee restores the stack
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_allmul ENDP
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end
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