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Git conversion: Make reactos the root directory, move rosapps, rostests, wallpapers into modules, and delete rossubsys.

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Colin Finck 2017-10-03 07:45:34 +00:00
parent b94e2d8ca0
commit c2c66aff7d
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sdk/lib/crt/math/i386/allmul_asm.s Normal file
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/*
* COPYRIGHT: See COPYING in the top level directory
* PROJECT: ReactOS kernel
* PURPOSE: Run-Time Library
* FILE: lib/sdk/crt/math/i386/allmul_asm.s
* PROGRAMER: Alex Ionescu (alex@relsoft.net)
*
* Copyright (C) 2002 Michael Ringgaard.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the project nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES// LOSS OF USE, DATA, OR PROFITS// OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <asm.inc>
PUBLIC __allmul
/* FUNCTIONS ***************************************************************/
.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
//
__allmul:
#define ALO [esp + 4] // stack address of a
#define AHI [esp + 8] // stack address of a
#define BLO [esp + 12] // stack address of b
#define BHI [esp + 16] // stack address of b
//
// 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,AHI
mov ecx,BHI
or ecx,eax //test for both hiwords zero.
mov ecx,BLO
jnz short hard //both are zero, just mult ALO and BLO
mov eax,ALO
mul ecx
ret 16 // callee restores the stack
hard:
push ebx
// must redefine A and B since esp has been altered
#define A2LO [esp + 8] // stack address of a
#define A2HI [esp + 12] // stack address of a
#define B2LO [esp + 16] // stack address of b
#define B2HI [esp + 20] // stack address of b
mul ecx //eax has AHI, ecx has BLO, so AHI * BLO
mov ebx,eax //save result
mov eax,A2LO
mul dword ptr B2HI //ALO * BHI
add ebx,eax //ebx = ((ALO * BHI) + (AHI * BLO))
mov eax,A2LO //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
END