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 signed value by another 64-bit signed value and returns 22 * the 64-bit signed result and the 64-bit signed remainder. 23 */ 24 __declspec(naked) void __cdecl _aulldvrm(void) 25 { 26 // 27 // Wrapper Implementation over EDKII DivU64x64Remainder() routine 28 // UINT64 29 // EFIAPI 30 // DivU64x64Remainder ( 31 // IN UINT64 Dividend, 32 // IN UINT64 Divisor, 33 // OUT UINT64 *Remainder 34 // ) 35 // 36 _asm { 37 ; Original local stack when calling _aulldvrm 38 ; ----------------- 39 ; | | 40 ; |---------------| 41 ; | | 42 ; |-- Divisor --| 43 ; | | 44 ; |---------------| 45 ; | | 46 ; |-- Dividend --| 47 ; | | 48 ; |---------------| 49 ; | ReturnAddr** | 50 ; ESP---->|---------------| 51 ; 52 ; 53 ; On Exit: 54 ; EDX:EAX contains the quotient (dividend/divisor) 55 ; EBX:ECX contains the remainder (divided % divisor) 56 ; NOTE: this routine removes the parameters from the stack. 57 ; 58 59 ; 60 ; Set up the local stack for Remainder pointer 61 ; 62 sub esp, 8 63 push esp 64 65 ; 66 ; Set up the local stack for Divisor parameter 67 ; 68 mov eax, [esp + 28] 69 push eax 70 mov eax, [esp + 28] 71 push eax 72 73 ; 74 ; Set up the local stack for Dividend parameter 75 ; 76 mov eax, [esp + 28] 77 push eax 78 mov eax, [esp + 28] 79 push eax 80 81 ; 82 ; Call native DivU64x64Remainder of BaseLib 83 ; 84 call DivU64x64Remainder 85 86 ; 87 ; EDX:EAX contains the quotient (dividend/divisor) 88 ; Put the Remainder in EBX:ECX 89 ; 90 mov ecx, [esp + 20] 91 mov ebx, [esp + 24] 92 93 ; 94 ; Adjust stack 95 ; 96 add esp, 28 97 98 ret 16 99 } 100 } 101
