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Re: Debugging question
Peter Dufault wrote:
Can I ask you directly what debugging setup I should setup for the
mvme5500, i.e., GDB serial?
AFAIK, there is no support for GDB on this BSP out of the box. In cases
i.e., when hitting an exception you can trace back manually:
a) disassemble the ELF object (powerpc-rtems-objdump -dr <objfile>)
b) work your way through the stack / register dump
With a cross-gdb [powerpc-eabi target] you can do this symbolically, of
i.e., gdb will find the source code lines corresponding to the PC
addresses on the
stack [list *<pc_address>].
Regarding 'live debugging':
I wrote a GDB stub that can be used on powerpc/shared + derived BSPs.
Unfortunately, I had
no time to write documentation yet but the software as such is somewhat
Here's what you need:
a) a recent [i.e., yet unreleased] version of 'libbspExt'. This library
provides a simple API
to hook/register exception handlers. The GDB stub needs this to
register its handler
which intercepts exceptions.
b) rtems-gdb-stub software package. This provides a GDB helper thread
the stub [interpreter of the GDB remote protocol]. Should work on
sockets and serial
ports but serial port support is not implemented yet [not hard to
do]. This means that
you need a working TCP/IP stack.
The package consists of generic material and architecture specific
pieces which are
currently implemented only for PPC/shared and pc386.
c) patch for GDB (small bugfix [i.e. fix is small, implications of the
bug are big]
+ support for loadable modules on the target [not an issue if you
don't use the cexp shell])
If you want to experiment with this stuff let me know and send you the
I will research these things myself, but if you're willing to answer
then I'm willing to ask. I'll be sure to document what I figure out
on the mailing list and rtems "wiki".
HD Associates, Inc.