Breakpoint and static functions

["Cheng, Cheuk" <cheng at powertv dot com>]

Hi, I am new to GDB and am having problem with the following.  I am
using a propietary OS running from ROM on an usparc based embedded
system.  This OS has a GDB nub (written in C and inline assembly) in it.
Here is what I do.

- Boot up usparc hardware containing debug build of OS in ROM.

- set up GDB remote debug link from my PC to the hardware.

- Enter "file osdebug.cof" at GDB prompt.

- Enter "add-symbol-file application.cof <load_address>" at GDB prompt.

- Enter "target rem com1" at GDB prompt.

- Enter command to load application into RAM inside a PC terminal
program.  Wait for it to finish loading.

- Enter command inside PC terminal program to tell the OS to break into
GDB.

- Enter "b <some_static_function>" at GDB prompt.  Continue application
execution.

- GDB breaks at <some_static_function>.  Enter "continue" to go on.

- GDB returns "Program received signal SIGTRAP, Trace/breakpoint trap."
Now even after I use the "delete" command to remove the breakpoint, if I
"continue" GDB will still break at the same spot.  Using the "clear"
command does not help too.

- Now if I change the source code of the application to make the
function non-static (by removing "static" in the function prototype and
rebuild the application binary), then the above message will still
appear (and the line number indicated by this message is still a few
lines before where I originally set the breakpoint, e.g. b <> was at
9874 while the message indicated break at 9871").  However after I
"delete" the original breakpoint, the message appears once and then I
can "continue" one more time and no more stopping from now on.

Am I doing something wrong in GDB?  Or can that be our GDB nub inside
the OS is bad (although I can always use the "list" command to view any
source module without any problem)?  Or is the use of static function
with GDB problematic?  Is it sufficient to have a GDB nub linked into
the OS which is running from ROM or the application has to have its own
GDB nub?

Thanks.


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