How to check bytes toward the other direction in gdb?

x/4x xxx will c开发者_运维问答heck bytes at higher address than xxx.

How to check bytes at lower address ?

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Just subtract the number of preceding bytes you want from xxx:

(gdb) x/4x 0x13b3da00
0x13b3da00: 0x004cc630  0x00000000  0x13af3ba0  0x00000000
(gdb) x/4x 0x13b3da00-4
0x13b3d9fc: 0x00000000  0x004cc630  0x00000000  0x13af3ba0
(gdb) x/4x 0x13b3da00-8
0x13b3d9f8: 0x00000000  0x00000000  0x004cc630  0x00000000