Kernel Debugging: Difference between revisions

=== Use LLDB with QEMU ===

LLDB supports GDB server that QEMU uses, so you can do the same thing with the previous section, but with some command modification as LLDB has some commands that are different than GDB

You can run QEMU to listen for a "GDB connection" before it starts executing any code to debug it.

qemu -s -S <harddrive.img>

...will setup QEMU to listen on port 1234 and wait for a GDB connection to it. Then, from a remote or local shell:

lldb

(lldb) process connect --plugin gdb-remote connect://localhost:1234

Process 1 stopped

* thread #1, stop reason = signal SIGTRAP

frame #0: 0x000000000000fff0

-> 0xfff0: addb %al, (%rax)

0xfff2: addb %al, (%rax)

0xfff4: addb %al, (%rax)

0xfff6: addb %al, (%rax)

(Replace localhost with remote IP / URL if necessary.) Then start execution: