Debugging user-code on xv6 with gdb

file cat, break main, continue

semi reference running and debugging xv6

From the xv6 top-level dir:

1. Run the emulator in debug mode (assuming no X11): make qemu-nox-gdb

2. In other terminal just run the debugger loading the kernel symbols with: gdb kernel This is important, otherwise the debugger will be confused between kernel and and user program symbols, for example main()

3. From the gdb interface run: (gdb) target remote localhost:26000 where 26000 is the TCP port that the step #1 report at the end (this might change).

4. Load the user exec with (gdb)file user_program

5. Place a breakpoint (gdb) break main and continue with (gdb) continue

6. etc...