[Bug target/19087] Overflowed address in dwarf debug line information

["dwatkins at tascsystems dot com" <gcc-bugzilla at gcc dot gnu dot org>]

------- Additional Comments From dwatkins at tascsystems dot com  2005-02-16 23:36 -------
Hello,

I have a few more notes to add.

1.  The binary image of the project built as described in my last post here 
runs properly on the target system.

2.  On my main development PC (one release ago of WinAVR) I ran:

avr-objdump -S -l spl.elf >> dump.txt

And then examined the huge file that resulted.  What I observed is that the > 
64k located source was at the front (i.e. consistent with what I observed in 
AVRStudio).  I didn't observe any < 64k located source until after the end of 
the "overlay" of the > 64k located source.  Beyond 64k, there was no source 
however function addresses still appeared ok.

3.  On my gcc toolset PC, (cygwin and gcc toolset compiled from source) I ran:

avr-objdump -S -l spl.elf >> dump.txt

And then examined the huge file that resulted.  The > 64k located line number 
info is all above 64k, the < 64k line number info is all below 64k.

4.  Torleif from Atmel emailed me acknowledging that AVRStudio expects the 
Dwarf addresses to be 16 bits and that this is likely the cause of 
the "allergic" reaction when I attempted to load up the file with 32 bit 
addresses into AVRStudio.

I think we are not far away from having a solution but it appears that it will 
require:
 - AVR GCC emit dwarf debug info using 32bit address size
 - AVRStudio be capable of parsing dwarf debug info using 32bit address size

It will be necessary to come up with a scheme to ensure that someone doesn't 
attempt to interoperate incompatible versions of tools or link a mixture of 
object files, some with 16 bit addresses and some with 32 bit addresses.


Darcy

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19087