Re: native gdb

[Simon Marchi <simon.marchi@polymtl.ca>]

On 2022-04-19 02:31, Mahesh Bodapati wrote:
> Thanks Simon,
>>I'm not 100% sure I understand your question, but I assume you want to
>>cross-compile GDB on an x86-64 build machine, so that GDB runs and
>>debugs natively on a Microblaze Linux system.
> 
> build != host == target (“cross-native”)
> 
> native toolchain, as it targets the same machine as it runs on. But it is build on another machine.
> 
> 
>>GDB already supports Microblaze, see files gdb/microblaze* in the tree.
>>However, we didn't have contributions that touched those files for a
>>while, so it's possible these have bitrotted a little bit.
> 
> I didn't see any issues while I compile cross-compile gdb which runs on x86 and I assume 'microblaze-linux-nat.c' has to be ported/added as similar to other target to make it run on a target natively and also files to be ported for MicroBlaze at " gdb/nat/" 

Ah, you're right, the existing files are only -tdep files, so there's no
native debugging support for Microblaze.

So, yeah, you would need to add a microblaze-linux-nat.c, edit
configure.nat to add an entry for Microblaze/Linux.
microblaze-linux-nat.c would contain a class definition like

class microblaze_linux_nat_target final : public linux_nat_target
{
  ...
}

and a static instance like:

static microblaze_linux_nat_target the_microblaze_linux_nat_target;

Then, I would suggest looking at another "simple" architecture, like
riscv-linux-nat.c, for inspiration.  That architecture only defines some
fetch_registers and store_registers methods, plus read_description.
That's probably about the minimal things you need to get something
working.

Simon