On Sat, Jun 25, 2022 at 7:35 PM ebashinskii <[email protected]> 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 > ) > > The question is what function GRUB actually jump into passing control to > the Kernel code and what is the purpose of *arch/x86/boot/main.c::main*? > This should answer most of the questions you may have about the kernel boot process: https://0xax.gitbooks.io/linux-insides/content/Booting/ :-) > _______________________________________________ > Kernelnewbies mailing list > [email protected] > https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies >
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