<re-sending as my registration had not been processed yet. I cc-ed Mark
Salter in the original mail>
Hi,
C6X uses a DSBT scheme for shared libraries. Seeing how it is quite
similar to FDPIC, it seems all the targets doing DSBT have migrated to
using FDPIC structures and code.
C6X has done that in this patch by Mark Salter:
http://lists.uclibc.org/pipermail/uclibc/2012-June/046906.html
Since the layout of the loadmap structure has been changed to match
FDPIC's one, this structure went out of synch with GDB's own definition
of the loadmap.
We need backwards compatibility though (let me know if this is not the
case) and GDB conditionally defines the old loadmap based on the
existence of PT_GETDSBT (defined in libc/sysdeps/linux/c6x/sys/ptrace.h).
My proposal is to drop this definition in uClibc and use the more common
PTRACE_GETFDPIC instead (already used in the kernel, Mark can correct me
if i'm wrong).
This way we guarantee GDB will use the correct loadmap for C6X.
I still expect GDB to be confused if it uses recent uClibc code that
still defines PT_GETDSBT though, but it doesn't look like we can solve
that easily.
Thoughts? Let me know what you think and i can come up with a patch.
Luis
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