remote debugging with gdb

[Martin Schuchardt]

Hello to all,

I have a little "big" problem with remote debugging with gdb. I have the 
following situation: I'm implementing an own operating system with the 
help of c++ and assembler (practice at the University). We're building 
the whole system starting with an output on the Screen.
If we compile the complete system we use make. We've got a Makefile and 
Linker-Skripts. After using "make bootdisk.img" we get a file, named 
bootdisk.img (this one has to be a floppy Image which we could use with 
bochs to emulate our self-written OS). But there are some other files 
too, "system" and "system.img". The First one (system) could be the one 
to debug with gdb. The other one's purpose is completely unknown.

Okay ... now to bochs. I've recompiled bochs with "$ ./configure 
--enable-gdb-stub". I've rearranged the position of bss_base, data_base 
and text_base at the linker skript. Now I added the line
"gdbstub: enabled=1, port=1234, text_base=0x10000, data_base=0x20000, 
bss_base=0x30000" at the bochsrc.txt (the currently used Config file of 
bochs).

now I could start bochs and it stops with the line "waiting for gdb to 
connect". So I startet gdb with the file "system". Everything works 
fine. Now I have to connect gdb with bochs. That's why I'm typing 
"target remote localhost:1234" at the gdb command line.

Now I get the following error message:

(gdb) target remote localhost:1234

Remote debugging using localhost:1234
0x0000fff0 in ?? ()
Reply contains invalid hex digit 78

Does anybody know, why I get this reply? Bochs is still waiting for 
connection on localhost:1234. The complete Programm works fine without 
the debugger. (when I disable the debugger, bochs works fine and seems 
to work corrently.

mfg maddin