KGDB(7) BSD Reference Manual KGDB(7)
kgdb - remote kernel debugging with gdb
Should a programmer be dissatisfied with the OpenBSD kernel's internal debugger ddb(4), and have appropriate hardware available, a kernel with option KGDB may be built to effect remote debugging with gdb(1) instead. To prepare for debugging over serial line one would: • Obtain a second system and a crossover serial cable. • Connect the systems and test the cable. • Build a kernel with option KGDB and makeoptions DEBUG="-g". • Copy the resultant bsd.gdb to the control system, and boot the corresponding bsd on the target system. • On the control system, run gdb on the kernel just copied. • Issue the command "target remote /dev/<serial port>" within gdb. The target system should enter kgdb at this point. • Debug as normal and detach when done, the target should resume normal operation.
gdb(1), ddb(4), options(4) gdb info documents and online documentation.
The remote connection will introduce certain latencies a local debugger would not see. Not available on all architectures. MirOS BSD #10-current August 23, 2001 1
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