diff options
Diffstat (limited to '')
-rw-r--r-- | src/VBox/Devices/EFI/Firmware/MdePkg/Library/BaseLib/Ia32/RRotU64.nasm | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/src/VBox/Devices/EFI/Firmware/MdePkg/Library/BaseLib/Ia32/RRotU64.nasm b/src/VBox/Devices/EFI/Firmware/MdePkg/Library/BaseLib/Ia32/RRotU64.nasm new file mode 100644 index 00000000..63b82eb1 --- /dev/null +++ b/src/VBox/Devices/EFI/Firmware/MdePkg/Library/BaseLib/Ia32/RRotU64.nasm @@ -0,0 +1,44 @@ +;------------------------------------------------------------------------------ +; +; 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 + |