Add support for gprofng on LoongArch

[Vladimir Mezentsev]

On 5/17/24 01:26, mengqinggang wrote:
> Hi,
>
> I am porting gprofng to LoongArch architecture.
> I have some question about stack_unwind function in 
> libcollector/unwind.c.
> Is it possible to use .eh_frame section for stack unwinding?

We can teach libcollector to read Elf and parse the .eh_frame section.
But we need to map each address to a Loadobject.
How can we do it ?
We don't have time to read /proc/self/map_files/ every time.
We have approximately 0.1 seconds for stack_unwind() and data recording 
in the experiment.

-Vladimir





> Aarch64 stack unwind is simple because x29, x30 register saved on SP 
> and (SP + 8).
> But x86_64 stack unwind need to walk through instructions, it looks 
> very complicated.
> Is there any other method for stack unwind?
>
> Thank you.
>
>