mirror of https://github.com/acidanthera/audk.git
101 lines
2.7 KiB
C
101 lines
2.7 KiB
C
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/** @file
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64-bit Math Worker Function.
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The 32-bit versions of C compiler generate calls to library routines
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to handle 64-bit math. These functions use non-standard calling conventions.
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Copyright (c) 2009 - 2011, Intel Corporation. All rights reserved.<BR>
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This program and the accompanying materials are licensed and made available
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under the terms and conditions of the BSD License which accompanies this
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distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php.
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#include <Library/BaseLib.h>
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/*
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* Divides a 64-bit signed value by another 64-bit signed value and returns
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* the 64-bit signed result and the 64-bit signed remainder.
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*/
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__declspec(naked) void __cdecl _aulldvrm(void)
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{
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//
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// Wrapper Implementation over EDKII DivU64x64Remainder() routine
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// UINT64
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// EFIAPI
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// DivU64x64Remainder (
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// IN UINT64 Dividend,
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// IN UINT64 Divisor,
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// OUT UINT64 *Remainder
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// )
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//
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_asm {
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; Original local stack when calling _aulldvrm
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; -----------------
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; | |
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; |---------------|
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; | |
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; |-- Divisor --|
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; | |
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; |---------------|
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; | |
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; |-- Dividend --|
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; | |
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; |---------------|
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; | ReturnAddr** |
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; ESP---->|---------------|
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;
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;
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; On Exit:
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; EDX:EAX contains the quotient (dividend/divisor)
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; EBX:ECX contains the remainder (divided % divisor)
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; NOTE: this routine removes the parameters from the stack.
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;
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;
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; Set up the local stack for Remainder pointer
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;
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sub esp, 8
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push esp
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;
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; Set up the local stack for Divisor parameter
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;
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mov eax, [esp + 28]
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push eax
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mov eax, [esp + 28]
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push eax
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;
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; Set up the local stack for Dividend parameter
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;
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mov eax, [esp + 28]
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push eax
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mov eax, [esp + 28]
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push eax
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;
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; Call native DivU64x64Remainder of BaseLib
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;
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call DivU64x64Remainder
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;
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; EDX:EAX contains the quotient (dividend/divisor)
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; Put the Remainder in EBX:ECX
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;
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mov ecx, [esp + 20]
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mov ebx, [esp + 24]
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;
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; Adjust stack
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;
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add esp, 28
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ret 16
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}
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}
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