Invalid register eip?

Question

I am debugging a c program with gdb in linux terminal, I disassembled it and ran it, then tried to find the memory address the the EIP register. This is what happened:

(gdb) i r eip Invalid register `eip'

Why does it say that my eip register is invalid?

Yes that's it thank you I had no idea they were different names. — jay, Feb 18 '12 at 07:14

score 25 · Accepted Answer · answered Feb 18 '12 at 07:22

25

Is it a 64-bit program? If so, it's rip, not eip.

answered Feb 18 '12 at 07:22

Alexey Frunze

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Note that `gdb` allows you to refer to the program counter using `$pc`. This will work on both 32 and 64 bit, and also on other architectures. – Jester Jan 09 '15 at 13:48
So what to do if I want eip instead rip? – Deep Jadia Feb 19 '19 at 21:12
@DeepJadia You can't really choose because it's ip in 16-bit mode, eip in 32-bit mode and rip in 64-bit mode. – Alexey Frunze Feb 20 '19 at 06:03

score 6 · Answer 2 · edited Jun 30 '17 at 00:42

6

Depending on your program's architecture the register can change:

16 bit - ip
32 bit - eip
64 bit - rip

edited Jun 30 '17 at 00:42

CalvT

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answered Jun 29 '17 at 02:46

0x00A5

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Invalid register eip?

2 Answers2