LEA in x86 assembly

2018-06-25 20:46:39

This question already has an answer here:

What's the purpose of the LEA instruction? 14 answers

Basically

mov eax, [esp+0x18]

means

mov eax, esp
add eax, 0x18
mov eax, [eax]

and in C that would look like

eax = *(unsigned int*)(esp + 0x18)

Meanwhile

lea eax, [esp+0x18]

means

mov eax, esp
add eax, 0x18

and in C that would look like

eax = esp + 0x18

It stores esp + 0x18 in eax . In other words, it's just addition. LEA is frequently used to perform basic arithmetic.

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