Tom Felb wrote:
Hi group!
I have a hardcopy version of "Programming from the Ground up" and I
don't understand what's the difference between immediate mode
addressing like movl $12, %eax (load eax with number 12) and
$variablename, %eax (load the address of variablename into eax)
That's the same syntax with the dollar sign? I'm a little bit confused!??
Thanks for any help!
tfb
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variablename in this case is a label. When the program is assembled, all
instances where that label is used is replaced with the memory address
of the data under that label. Something like movl variablename, %eax
would load the data at that memory address into eax, while using
immediate mode moves the actual memory address itself. So movl
$variablename, %eax is also immedite mode. Hope that helps.
Brian Scott
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