1 /** @file
2 64-bit Math Worker Function.
3 The 32-bit versions of C compiler generate calls to library routines
4 to handle 64-bit math. These functions use non-standard calling conventions.
5
6 Copyright (c) 2009 - 2011, Intel Corporation. All rights reserved.<BR>
7 This program and the accompanying materials are licensed and made available
8 under the terms and conditions of the BSD License which accompanies this
9 distribution. The full text of the license may be found at
10 http://opensource.org/licenses/bsd-license.php.
11
12 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
13 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
14
15 **/
16
17 #include <Library/BaseLib.h>
18
19
20 /*
21 * Divides a 64-bit unsigned value with a 64-bit unsigned value and returns
22 * a 64-bit unsigned result.
23 */
_aulldiv(void)24 __declspec(naked) void __cdecl _aulldiv (void)
25 {
26 //
27 // Wrapper Implementation over EDKII DivU64x64Reminder() routine
28 // UINT64
29 // EFIAPI
30 // DivU64x64Remainder (
31 // IN UINT64 Dividend,
32 // IN UINT64 Divisor,
33 // OUT UINT64 *Remainder OPTIONAL
34 // )
35 //
36 _asm {
37
38 ; Original local stack when calling _aulldiv
39 ; -----------------
40 ; | |
41 ; |---------------|
42 ; | |
43 ; |-- Divisor --|
44 ; | |
45 ; |---------------|
46 ; | |
47 ; |-- Dividend --|
48 ; | |
49 ; |---------------|
50 ; | ReturnAddr** |
51 ; ESP---->|---------------|
52 ;
53
54 ;
55 ; Set up the local stack for NULL Reminder pointer
56 ;
57 xor eax, eax
58 push eax
59
60 ;
61 ; Set up the local stack for Divisor parameter
62 ;
63 mov eax, [esp + 20]
64 push eax
65 mov eax, [esp + 20]
66 push eax
67
68 ;
69 ; Set up the local stack for Dividend parameter
70 ;
71 mov eax, [esp + 20]
72 push eax
73 mov eax, [esp + 20]
74 push eax
75
76 ;
77 ; Call native DivU64x64Remainder of BaseLib
78 ;
79 call DivU64x64Remainder
80
81 ;
82 ; Adjust stack
83 ;
84 add esp, 20
85
86 ret 16
87 }
88 }
89