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+--- Forum: Assembly (https://zeroday.vip/Forum-Assembly)
+--- Thread: What does ESP mean in assembly? (/Thread-What-does-ESP-mean-in-assembly)
What does ESP mean in assembly? - poundfoolish141 - 07-24-2023
ESP = ? stack pointer
What does **E** stand for here?
**UPDATE**
RSP for 64bit?
What does `R` mean here?
RE: What does ESP mean in assembly? - trombidiasis104 - 07-24-2023
`E` stands for `Extended`
> With the advent of the 32-bit 80386 processor, the 16-bit general-purpose registers, base registers, index registers, instruction pointer, and FLAGS register, but not the segment registers, were expanded to 32 bits. This is represented by prefixing an **"E" (for Extended)** to the register names in x86 assembly language.
[Source][1]
[1]:
[To see links please register here]
RE: What does ESP mean in assembly? - gasified656817 - 07-24-2023
Perhaps for consistency with the other 32-bit registers: `EAX`, `EBX` etc.
For those, `E` means "extended" - i.e. to 32 bits (the 16-bit versions are called `AX`, `BX` etc.)
P.S. according to [The Free Dictionary][1], `ESP` stands for Extended Stack Pointer.
[1]:
[To see links please register here]
RE: What does ESP mean in assembly? - tonyaskhx - 07-24-2023
E means Extended. If you have SP 16bit, so ESP should be 32bit.
RE: What does ESP mean in assembly? - braziel615 - 07-24-2023
R is just for "register", with the new registers called just r8-r15. Since the old ones also needed names for their extended versions, the e was just swapped to r.