Alessandro Pittaluga wrote:
Hi,
When trying to access with gdb to variables allocated on a shared heap,
the following message is returned:
(gdb) print mypointer
$5 = (MYTYPE *) 0xb7dc4020
(gdb) print *mypointer
Cannot access memory at address 0xb7dc4020
All the applications (kernel and userland) are accessing correctly to
the heap-allocated memory.
Is this the expected behaviour or there's something wrong in my
installation?
Your installation is correct, GDB and Xenomai are too; unfortunately,
the following explanation is still accurate, i.e. a restriction in the
ptrace support:
http://sourceware.redhat.com/ml/gdb/2004-01/msg00152.html
Since you can call routines inside your program from the GDB cli, the
best solution at hand would be to implement the suggestion found in this
post: e.g.
void print_heap (void)
{
... output the heap contents...
}
and,
(gdb) call print_heap()
You could even pass arguments to print_heap() for customizing your output.
A possible option to work around that would be to stop having heaps
marked as I/O regions though, but the kernel-provided remapping helper
we use currently forces this property. I'll look at this when time allows.
Many Thanks
Alessandro
--
Philippe.
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