reverse execution

[ishare]

    I record at 0x40000000 , then I nexti 10 instructions , then I want reverse execute 
    these 10 instructions one by one, So I type reverse-nexti ,but unexpectly ,gdb directly
    goes back to the addresss 0x40000000 ,where I start record .

    What I need is 10->9->8->7->6->5->4->3->2->1 ,not execute again from begin to end .

    How can I do for this ?

    thanks in advance !