RE: [Qemu-devel] Cross-debugging support in QEMU using GDB

[Boyapati, Anitha]

Hello Alex,

> > Essentially, what I am looking for is something like,
> >     qemu-x -s <any_ELF_executable> [options]
> >     targetx-gdb <any_ELF_executable>
> 
> Yes. qemu-x -g 1234 <file> <options>
> And then use gdb -ex 'target remote localhost:1234'.
> 
> > where qemu-x is a user mode qemu for target X.
> >
> > More on (2): if there is no OS, then I think a small application
> > like bootloader should probably be present to launch the cross-
> > compiled executable on to Qemu. Any further suggestions on how to
> > make (2) possible?  All the previous threads in developer mail
> > archives dealt with debugging linux image in some form or the other.
> 
> Qemu does that job, interpreting the ELF headers. I'm not sure where
> the linking is done though, so maybe better read the code there :-).
> 
> Just try out qemu-i386 for now! Try to run a statically linked i386
> binary on a non-i386 platform, so you get the hang of it.
> 

Wow! I just got the gist of entire thing having done the same successfully for 
i386. Actually I got confused at multiple points purely because of my mistakes.

As I am running the entire setup on virtual box, I don't have bzImage. I 
continued my kernel debugging attempts with linux.img (me in sleep mode :P). 
Then I ran an avr32 version of qemu which gave some weird results (the patch 
Rabin gave has GDB support in its TODO list and I overlooked it).Indeed the 
advice greatly helped to sort out most of the issues :)

On the other hand, I think this can be documented in GDB usage section of QEMU 
documentation.


Thanks,
Anitha