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
– jay, Commented Feb 18, 2012 at 7:14

Alexey Frunze · Accepted Answer · 2012-02-18 07:22:31Z

25

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

answered Feb 18, 2012 at 7:22

Alexey Frunze

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3 Comments

Jester Over a year ago

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.

Deep Jadia Over a year ago

So what to do if I want eip instead rip?

Alexey Frunze Over a year ago

@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.

CalvT · Accepted Answer · 2017-06-30 00:42:52Z

6

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

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

edited Jun 30, 2017 at 0:42

CalvT

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answered Jun 29, 2017 at 2:46

0x00A5

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