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gcc inline asm question

hello!
1) stack var (e.g. pBuff) contains pointer to byte array
2) register (e.g. ebx) contains index to this array

i need take as follows:
[b]movzbl (%esp,%ebx), %eax[/b]
i.e. i need access to byte pBuff[ebx]

how do write such asm command on gcc inline asm?
note: it [b]must[/b] be single command!

thanks!
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