(gdb.info) Remote Serial
The GDB remote serial protocol
To debug a program running on another machine (the debugging
"target" machine), you must first arrange for all the usual
prerequisites for the program to run by itself. For example, for a C
program, you need:
1. A startup routine to set up the C runtime environment; these
usually have a name like `crt0'. The startup routine may be
supplied by your hardware supplier, or you may have to write your
2. A C subroutine library to support your program's subroutine calls,
notably managing input and output.
3. A way of getting your program to the other machine--for example, a
download program. These are often supplied by the hardware
manufacturer, but you may have to write your own from hardware
The next step is to arrange for your program to use a serial port to
communicate with the machine where GDB is running (the "host" machine).
In general terms, the scheme looks like this:
_On the host,_
GDB already understands how to use this protocol; when everything
else is set up, you can simply use the `target remote' command
( Specifying a Debugging Target Targets.).
_On the target,_
you must link with your program a few special-purpose subroutines
that implement the GDB remote serial protocol. The file
containing these subroutines is called a "debugging stub".
On certain remote targets, you can use an auxiliary program
`gdbserver' instead of linking a stub into your program.
Using the `gdbserver' program Server, for details.
The debugging stub is specific to the architecture of the remote
machine; for example, use `sparc-stub.c' to debug programs on SPARC
These working remote stubs are distributed with GDB:
For Intel 386 and compatible architectures.
For Motorola 680x0 architectures.
For Hitachi SH architectures.
For SPARC architectures.
For Fujitsu SPARCLITE architectures.
The `README' file in the GDB distribution may list other recently
* Stub Contents What the stub can do for you
* Bootstrapping What you must do for the stub
* Debug Session Putting it all together
* Protocol Definition of the communication protocol
* Server Using the `gdbserver' program
* NetWare Using the `gdbserve.nlm' program
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