movl / leal, difference in this case
This question already has an answer here:
They are not similar.
mov ebx, (esp)
lea ecx, (esp)
(in regular assembler, not gas style). The first loads ebx with the contents of esp . The second loads ecx with esp itself. The similar "regular" expression would have been
mov ecx, esp
but using lea you can immediately add a constant, a register, or both to ecx . Eg,
lea ecx, (esp+4*eax+10h)
sets ecx to esp + 4*eax + 10h -- using 'mov', you would have to add these with more instructions.
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