On Sat, Jun 25, 2022 at 5:35 PM ebashinskii <ebashins...@proton.me> wrote:
> CPU: Intel x86 KabyLake. I'm using 5.17 Kernel built from upstream and > GRUB 2.04 > > When debugging the kernel initialization process I found out that there is > a function *void main(void)* in the source file *arch/x86/boot/main.c* (source > link: > https://elixir.bootlin.com/linux/v5.17/source/arch/x86/boot/main.c#L134) which > seems to be the entry point which the boot loader is supposed to jump into. > > But *objdump*-ing the Kernel image shows that there is no such symbol as > *main*. GDB attached to QEMU does not know about this symbol either. > > The earliest stage of Kernel Initialization I could manage to catch with > GDB is *x86_64_start_kernel* (source link: > https://elixir.bootlin.com/linux/v5.17/source/arch/x86/kernel/head64.c#L467 > ) > > What are you trying to do that start-kernel is insufficiently early ? main.c 's that you dont hit dont really matter do they ? fwiw, I really like virtme virtme-run $KRUN_SHOW $KRUN_STDS $KDBG_OPTS $* $QM_OPTS --smp 3 -s -S the -s -S stops me early enough to anything Ive needed to so far.
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