How to change entry point after file was loaded?

[denys-volodarskyi]

I want to change entry and reanalyze from this address.

bv.entry_point is read-only

[psifertex]

You cannot but also, there's no real reason to. The entry point is only special in that it is assumed to have a function there. Simply make another function anywhere else and the same recursive descent analysis will happen from that function as well. You can do this with "p" in the UI or create_user_function.

[denys-volodarskyi]

Thanks for the response.

My entry function defines R13 register (PowerPC) and it's global pointer used later in many other functions.

If I set it via Analysis/Global Pointer Value (ConstantPointerValue) and do Reanalyze it's propagated to these functions. But after restart it's gone and I have to set it manually again.

I thought the reason is analysis root function is not properly set and it cannot do it automatically.

[psifertex]

Ahh, that's a good question, let me check with my co-workers, I believe setting it via analysis should be maintained, that might be a separate bug.

[xusheng6]

1. It should be saved and this sounds like a bug. Can you share the file with us (in public or in private) so that I can reproduce it?
2. This has nothing to do with whether the function being the entry point function

[denys-volodarskyi]

That's powerpc binary

r13 is set at 0x202c8 as result of

000202c8  3da04001   lis     r13, 0x4001
000202cc  39ad91e4   addi    r13, r13, -0x6e1c  {0x400091e4}

r2 seems to be global value too, but currently I guess there's no way to set more than one value

binary.zip

[xusheng6]

I have created the issue #6253 to track this bug