I am trying to work my way through an Intel assembly file and I

Question

Asked: May 25, 20262026-05-25T14:58:42+00:00 2026-05-25T14:58:42+00:00

I am trying to work my way through an Intel assembly file and I ran into a bit of code I don’t understand.

# Save current stack pointer to old thread's stack, if any.
movl SWITCH_CUR(%esp), %eax
movl %esp, (%eax,%edx,1)

I understand that the first line moves the value of 12 offset from register %esp into the register %eax.

But I don’t understand what the second line does it moves %esp into what.

Is (%eax,%edx,1) a logical and operation? Or addition?

Any help would be great.

Thanks

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Editorial Team · Answer 1 · 2026-05-25T14:58:43+00:00

Editorial Team

The meaning is

mov %esp, (%eax + %edx * 1)

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