📚 OpenRCE is preserved as a read-only archive. Launched at RECon Montreal in 2005. Registration and posting are disabled.








Flag: Tornado! Hurricane!

 Forums >>  IDA Pro  >>  Few quick questions about IDA Pro usage

Topic created on: July 24, 2008 10:47 CDT by dvs .

Bit of an IDA Pro newb here.

I have a function which I'm trying to reverse and I determined that the first argument is a pointer to a structure.  I defined a structure of the appropriate name and now I want to propogate this information into the function itself.  Is there a way to do this?  If IDA pro knew that this parameter was a pointer to this structure, then in theory it should be able to update all kinds of references that say things like mov edx, dword ptr [eax+4] to something like mov edx, dword ptr [arg_0->Field2]

Or at least that's what I'd like anyway.

Also I made a few errors while playing around in this function, and now the function looks like junk.  Not exactly sure what I did, but is there a way to just say "re-analyze this entire function so that it's exactly like it was at the very beginning"?

  dennis     July 24, 2008 16:05.12 CDT
hi,

>mov edx, dword ptr [eax+4] to something like mov edx, dword ptr [arg_0->Field2]

use the 't' keyboard shortcut when having placed the cursor on a particular operand or right-click and select a "structure offset". if you want IDA to do that automatically, I think only the hexrays decompiler is able to do that.

>it's exactly like it was at the very beginning"?

you can try selecting the bytes of the function that look like junk and undefine them ('u' keyboard shortcut). then, go back to the function's entrypoint and press 'p' to redefine the function - that's how it works for me.

  abuse007     August 12, 2008 01:23.47 CDT
You can change the function prototype definition by hitting 'y'. This will help propagate the data type in functions that call this function.

Note: Registration is required to post to the forums.

There are 31,328 total registered users.


Recently Created Topics
[help] Unpacking VMP...
Mar/12
Reverse Engineering ...
Jul/06
let 'IDAPython' impo...
Sep/24
set 'IDAPython' as t...
Sep/24
GuessType return une...
Sep/20
About retrieving the...
Sep/07
How to find specific...
Aug/15
How to get data depe...
Jul/07
Identify RVA data in...
May/06
Question about memor...
Dec/12


Recent Forum Posts
Finding the procedur...
rolEYder
Question about debbu...
rolEYder
Identify RVA data in...
sohlow
let 'IDAPython' impo...
sohlow
How to find specific...
hackgreti
Problem with ollydbg
sh3dow
How can I write olly...
sh3dow
New LoadMAP plugin v...
mefisto...
Intel pin in loaded ...
djnemo
OOP_RE tool available?
Bl4ckm4n


Recent Blog Entries
halsten
Mar/14
Breaking IonCUBE VM

oleavr
Oct/24
Anatomy of a code tracer

hasherezade
Sep/24
IAT Patcher - new tool for ...

oleavr
Aug/27
CryptoShark: code tracer ba...

oleavr
Jun/25
Build a debugger in 5 minutes

More ...


Recent Blog Comments
nieo on:
Mar/22
IAT Patcher - new tool for ...

djnemo on:
Nov/17
Kernel debugger vs user mod...

acel on:
Nov/14
Kernel debugger vs user mod...

pedram on:
Dec/21
frida.github.io: scriptable...

capadleman on:
Jun/19
Using NtCreateThreadEx for ...

More ...


Imagery
SoySauce Blueprint
Jun 6, 2008

[+] expand

View Gallery (11) / Submit