Abort x86 assemble code

Hello all

I have following code ,and I can not understand the mark line,who can tell me.thanks.
--------------------------------------------------------------

00000eb8 movb   (%ebx),%al      <<IMPORTANT 1-4>>
00000eba incl   %ebx
00000ebb movl   %edi,%ecx
00000ebd shrl   $0x8,%ecx
00000ec0 movl   %edi,%edx
00000ec2 xorb   %dl,%al
00000ec4 movzbl %al,%eax
00000ec7 xorl   0x400dec(,%eax,4),%ecx					????<-----------------What it to do.
00000ece movl   %ecx,%edi
00000ed0 movl   %esi,%eax               <-- jmp here
00000ed2 decl   %esi
00000ed3 orl    %eax,%eax
00000ed5 jne    00000eb8
00000ed7 movl   %edi,0x406894           <- 1-4 see here
00000edd popl   %esi
00000ede popl   %edi
00000edf popl   %ebx

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thanks .

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