I would recommend looking at what gokrazy does:
https://gokrazy.org/
I believe the entrypoint of their pid1 is this generated Go code:
https://github.com/gokrazy/tools/blob/main/internal/packer/buildinit.go#L17
You might use that to see what kinds of initialization it does to cooperate
with the kernel.
On Mon, 17 Feb 2025 at 19:52, 'Hannes Stauss' via golang-nuts <
golang-nuts@googlegroups.com> wrote:
> Dear
> I have an empty go program that I would like to run as pid1 from the
> initramfs embedded into the kernel after the linux kernel booted (a real
> init would for sure do more than just looping forever):
> package main
>
> func main() {
> for {
> }
> }
>
>
> Any ideas where to follow to narrow down the issue? Many thanks in advance.
>
> I can get it running without panic when I call the go program from a c
> program that first mounts dev filesystem:
> int main()
> {
> // Mount the devtmpfs filesystem to /dev
> mount("devtmpfs", "/dev", "devtmpfs", 0, NULL);
>
> // run the main program
> execl("/main", "/main", (char *)NULL);
> exit(EXIT_FAILURE);
> }
>
> When calling the go program without first mounting dev filesystem I get
> again a kernel panic.
>
> I seems the go runtime somehow needs a mounted dev filesystem in order to
> initialize properly.
>
> My test platform is aarch64 running in qemu with following command:
> qemu-system-aarch64 \
> -machine virt \
> -cpu cortex-a57 \
> -smp 2 -m 2048 \
> -kernel linux/arch/arm64/boot/Image \
> -append "console=ttyAMA0" \
> -nographic
>
>
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