58 lines
800 B
ArmAsm
58 lines
800 B
ArmAsm
.arch i8086,jumps
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.code16
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.att_syntax prefix
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#NO_APP
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#APP
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.section .text.init
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.global _start
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_start:
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.section .text.main
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.global main
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main:
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push %bp
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mov %sp, %bp
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mov 8(%bp), %si
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push (%si)
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call crc16
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add $0x2, %sp
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mov 6(%bp), %di
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mov %ax, (%di)
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pop %bp
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lret $4
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#NO_APP
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.text
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.global crc16
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.type crc16, @function
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crc16:
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pushw %bp
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movw %sp, %bp
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xorw %bx, %bx
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movw $-1, %ax
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.L2:
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cmpw 4(%bp), %bx
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jne .L5
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popw %bp
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ret
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.L5:
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movb %cs:(%bx), %dl
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movb $8, %cl
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shlw %cl, %dx
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xorw %dx, %ax
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movb %cl, %dl
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.L4:
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movw %ax, %cx
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shlw $1, %cx
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testw %ax, %ax
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xchgw %ax, %cx
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jge .L3
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xorw $4129, %ax
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.L3:
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decb %dl
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jne .L4
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incw %bx
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jmp .L2
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.size crc16, .-crc16
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.ident "GCC: (GNU) 6.3.0"
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