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about sub instruction

Q L
Note: This was originally posted on 25th July 2012 at http://forums.arm.com

I am a new guy come to arm and I come across an instruction "SUB  \reg0, \reg0, \reg1, lsl #STACK_BITS_PER_CPU".
In other assembly languages, SUB has 3 parameters, but this one have   five. Please tell me what the instruction mean or provide me some   references.
Thank you very much.