Re: two gdb porting questions

[Daniel Jacobowitz <drow@mvista.com>]

On Sun, Jan 26, 2003 at 11:50:55AM +0100, Jan Hoogerbrugge wrote:
> >From: Daniel Jacobowitz <drow@mvista.com>
> 
> >> * I want to use stabs to pass frame information from my compiler to
> >>  gdb. Which stab number(s) should I use for this? How do I get this
> >>  information in my xxx-tdep.c given the start address of the
> >>  function? (I use ELF in the case that matters)
> >
> >Is it absolutely necessary that you use stabs?  There are clean ways to
> >express this information in DWARF-2, and if you're using ELF, there's
> >really no excuse.
> 
> My compiler (which is not gcc) happens to generate stabs. So I have to do 
> it with stabs. Currently the compiler misuses a N_ROSYM to pass frame info 
> to its debugger. However, gdb does not like this.
> 
> Are there other targets where a stab is used for frame information?
> 
> The instruction format of the debug target is so complex that decoding the 
> prologue is not a real option.

We did something similar for an unpublished port; as a local hack it
wasn't too bad and we did it just about the same way you're describing. 
You just stuff the value in a new field in the symbol struct.

Eventually we arranged to generate DWARF-2 instead, though, and it went
away.

-- 
Daniel Jacobowitz
MontaVista Software                         Debian GNU/Linux Developer