My question is about remote debugging an application on an embedded arm processor using gdb/gdbserver.
I can debug the application itself, but the application dynamically links to a shared library which implements an in house communications protocol. I want to be able to set breakpoints within the shared library functions so try to figure out some device discovery problems.
I have made sure that the library is compiled with debug symbols and is loaded by gdb on the host side, I can list functions within the library and even set the breakpoints but as soon as I try to run the application I get an error message to the effect of:
Cannot insert breakpoint X.
Error accessing memory address [Hex address]: Input/output error.
where X is the breakpoint number in gdb and [Hex address] is an address far to small to be valid.
I am using the new library on both the target and the host machine, but via mount -o bind newlib oldlib on the target from an nfs mount.
Does anyone have an idea about what could be wrong?
Thanks in advance.
Wild guess: you loaded the shared library into host GDB at incorrect address.
Instead of explicitly loading it into GDB, use "set stop-on-solib-event on", wait for the library to get loaded (info shared will tell you current list of loaded libraries), and then set the breakpoints.