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101 lines
1.4 KiB
101 lines
1.4 KiB
CODE32
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EXPORT |CrcUpdateT4@16|
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AREA |.text|, CODE, ARM
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MACRO
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CRC32_STEP_1
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ldrb r4, [r1], #1
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subs r2, r2, #1
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eor r4, r4, r0
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and r4, r4, #0xFF
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ldr r4, [r3, +r4, lsl #2]
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eor r0, r4, r0, lsr #8
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MEND
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MACRO
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CRC32_STEP_4 $STREAM_WORD
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eor r7, r7, r8
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eor r7, r7, r9
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eor r0, r0, r7
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eor r0, r0, $STREAM_WORD
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ldr $STREAM_WORD, [r1], #4
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and r7, r0, #0xFF
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and r8, r0, #0xFF00
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and r9, r0, #0xFF0000
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and r0, r0, #0xFF000000
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ldr r7, [r6, +r7, lsl #2]
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ldr r8, [r5, +r8, lsr #6]
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ldr r9, [r4, +r9, lsr #14]
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ldr r0, [r3, +r0, lsr #22]
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MEND
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|CrcUpdateT4@16| PROC
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stmdb sp!, {r4-r11, lr}
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cmp r2, #0
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beq |$fin|
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|$v1|
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tst r1, #7
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beq |$v2|
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CRC32_STEP_1
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bne |$v1|
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|$v2|
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cmp r2, #16
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blo |$v3|
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ldr r10, [r1], #4
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ldr r11, [r1], #4
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add r4, r3, #0x400
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add r5, r3, #0x800
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add r6, r3, #0xC00
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mov r7, #0
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mov r8, #0
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mov r9, #0
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sub r2, r2, #16
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|$loop|
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; pld [r1, #0x40]
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CRC32_STEP_4 r10
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CRC32_STEP_4 r11
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subs r2, r2, #8
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bhs |$loop|
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sub r1, r1, #8
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add r2, r2, #16
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eor r7, r7, r8
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eor r7, r7, r9
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eor r0, r0, r7
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|$v3|
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cmp r2, #0
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beq |$fin|
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|$v4|
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CRC32_STEP_1
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bne |$v4|
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|$fin|
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ldmia sp!, {r4-r11, pc}
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|CrcUpdateT4@16| ENDP
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END
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