MIPS stack tracing

[Andrew Cagney]

> Also, from scanning the sources, I would have to guess that the
>> alpha architecture is suffering the same problem.
> 
> 
> Perhaps, perhaps not.  It depends whether Alpha still uses .mdebug.
> 
> .mdebug is the ECOFF/Third-Eye debugging info format; binutils recently
> switched to generating stabs-in-ELF like other targets instead.
> 
> To my complete surprise, we apparently get PDR information out of the
> .mdebug section.  This is somewhat bizarre, as it is also present in a
> .pdr section independent of data format.  We need to read in this
> information.  I'll investigate next week (if no one beats me to it :).


It would go back to SGI (Hmm, didn't sgi switch to dwarf2?) which was 
using mdebug info.  A number of embedded MIPS toolchains would have been 
mdebug for compatability (I know this as I filed gdb/150, gdb/152 and 
gdb/149) and I have a sinking feeling that they haven't yet ``just gone 
away''.

	Andrew