1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
|
;------------------------------------------------------------------------------
;
; Copyright (c) 2006 - 2015, Intel Corporation. All rights reserved.<BR>
; SPDX-License-Identifier: BSD-2-Clause-Patent
;
; Module Name:
;
; RRotU64.nasm
;
; Abstract:
;
; 64-bit right rotation for Ia32
;
;------------------------------------------------------------------------------
SECTION .text
;------------------------------------------------------------------------------
; UINT64
; EFIAPI
; InternalMathRRotU64 (
; IN UINT64 Operand,
; IN UINTN Count
; );
;------------------------------------------------------------------------------
global ASM_PFX(InternalMathRRotU64)
ASM_PFX(InternalMathRRotU64):
push ebx
mov cl, [esp + 16]
mov eax, [esp + 8]
mov edx, [esp + 12]
shrd ebx, eax, cl
shrd eax, edx, cl
rol ebx, cl
shrd edx, ebx, cl
test cl, 32 ; Count >= 32?
jz .0
mov ecx, eax ; switch eax & edx if Count >= 32
mov eax, edx
mov edx, ecx
.0:
pop ebx
ret
|
