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- /***************************************************************************
- * Copyright (C) 2010 by Spencer Oliver *
- * spen@spen-soft.co.uk *
- * *
- * This program is free software; you can redistribute it and/or modify *
- * it under the terms of the GNU General Public License as published by *
- * the Free Software Foundation; either version 2 of the License, or *
- * (at your option) any later version. *
- * *
- * This program 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 General Public License for more details. *
- * *
- * You should have received a copy of the GNU General Public License *
- * along with this program; if not, write to the *
- * Free Software Foundation, Inc., *
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. *
- ***************************************************************************/
-
- /*
- r0 - address in - crc out
- r1 - char count
- */
-
- .text
- .arm
-
- _start:
- main:
- mov r2, r0
- mov r0, #0xffffffff /* crc */
- mov r3, r1
- mov r4, #0
- b ncomp
- nbyte:
- ldrb r1, [r2, r4]
- ldr r7, CRC32XOR
- eor r0, r0, r1, asl #24
- mov r5, #0
- loop:
- cmp r0, #0
- mov r6, r0, asl #1
- add r5, r5, #1
- mov r0, r6
- eorlt r0, r6, r7
- cmp r5, #8
- bne loop
- add r4, r4, #1
- ncomp:
- cmp r4, r3
- bne nbyte
- end:
- bkpt #0
-
- CRC32XOR: .word 0x04c11db7
-
- .end
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