mirror of
https://github.com/reactos/reactos.git
synced 2024-11-18 21:13:52 +00:00
122 lines
2 KiB
ArmAsm
122 lines
2 KiB
ArmAsm
/* Copyright (c) Mark Harmstone 2020
|
|
*
|
|
* This file is part of WinBtrfs.
|
|
*
|
|
* WinBtrfs is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU Lesser General Public Licence as published by
|
|
* the Free Software Foundation, either version 3 of the Licence, or
|
|
* (at your option) any later version.
|
|
*
|
|
* WinBtrfs is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU Lesser General Public Licence for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public Licence
|
|
* along with WinBtrfs. If not, see <http://www.gnu.org/licenses/>. */
|
|
|
|
#include <asm.inc>
|
|
|
|
EXTERN _crctable:DWORD
|
|
|
|
.code
|
|
|
|
/* uint32_t __stdcall calc_crc32c_sw(uint32_t seed, uint8_t* msg, uint32_t msglen); */
|
|
|
|
PUBLIC _calc_crc32c_sw@12
|
|
_calc_crc32c_sw@12:
|
|
|
|
push ebp
|
|
mov ebp, esp
|
|
|
|
push esi
|
|
push ebx
|
|
|
|
mov eax, [ebp+8]
|
|
mov edx, [ebp+12]
|
|
mov ebx, [ebp+16]
|
|
|
|
/* eax = crc / seed
|
|
* ebx = len
|
|
* esi = tmp
|
|
* edx = buf
|
|
* ecx = tmp2 */
|
|
|
|
crcloop:
|
|
test ebx, ebx
|
|
jz crcend
|
|
|
|
mov esi, eax
|
|
shr esi, 8
|
|
mov cl, byte ptr [edx]
|
|
xor al, cl
|
|
and eax, 255
|
|
shl eax, 2
|
|
mov eax, [_crctable + eax]
|
|
xor eax, esi
|
|
|
|
inc edx
|
|
dec ebx
|
|
|
|
jmp crcloop
|
|
|
|
crcend:
|
|
pop ebx
|
|
pop esi
|
|
|
|
pop ebp
|
|
|
|
ret 12
|
|
|
|
/****************************************************/
|
|
|
|
/* uint32_t __stdcall calc_crc32c_hw(uint32_t seed, uint8_t* msg, uint32_t msglen); */
|
|
|
|
PUBLIC _calc_crc32c_hw@12
|
|
_calc_crc32c_hw@12:
|
|
|
|
push ebp
|
|
mov ebp, esp
|
|
|
|
mov eax, [ebp+8]
|
|
mov edx, [ebp+12]
|
|
mov ecx, [ebp+16]
|
|
|
|
/* eax = crc / seed
|
|
* ecx = len
|
|
* edx = buf */
|
|
|
|
crchw_loop:
|
|
cmp ecx, 4
|
|
jl crchw_stragglers
|
|
|
|
crc32 eax, dword ptr [edx]
|
|
|
|
add edx, 4
|
|
sub ecx, 4
|
|
jmp crchw_loop
|
|
|
|
crchw_stragglers:
|
|
cmp ecx, 2
|
|
jl crchw_stragglers2
|
|
|
|
crc32 eax, word ptr [edx]
|
|
|
|
add edx, 2
|
|
sub ecx, 2
|
|
|
|
crchw_stragglers2:
|
|
test ecx, ecx
|
|
jz crchw_end
|
|
|
|
crc32 eax, byte ptr [edx]
|
|
inc edx
|
|
dec ecx
|
|
jmp crchw_stragglers2
|
|
|
|
crchw_end:
|
|
pop ebp
|
|
|
|
ret 12
|
|
|
|
END
|