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