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liminix/pkgs/preinit/default.nix

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rewrite preinit as very small C program By using the kernel "nolibc" header to avoid requiring a C library, we can bring the initramfs size to around 4k This does involve a tiny bit of inline mips assembly which I'm not sure about. gcc seems unwilling to generate the code to load $gp at function entry of main(), so we do it by hand - but I'd rather find out why gcc doesn't.
2023-04-15 16:35:02 +00:00
{
stdenv
, gdb
}:
stdenv.mkDerivation {
name = "preinit";
src = ./.;
preinit: disable nolibc - it stopped working with 22.11->23.05 - linking statically against musl is about 17k, so this is costing us 11k or so
2023-06-18 22:02:08 +00:00
# NIX_DEBUG=2;
rewrite preinit as very small C program By using the kernel "nolibc" header to avoid requiring a C library, we can bring the initramfs size to around 4k This does involve a tiny bit of inline mips assembly which I'm not sure about. gcc seems unwilling to generate the code to load $gp at function entry of main(), so we do it by hand - but I'd rather find out why gcc doesn't.
2023-04-15 16:35:02 +00:00
hardeningDisable = [ "all" ];
postBuild = ''
$STRIP --remove-section=.note --remove-section=.comment preinit
preinit: disable nolibc - it stopped working with 22.11->23.05 - linking statically against musl is about 17k, so this is costing us 11k or so
2023-06-18 22:02:08 +00:00
ls -l preinit
rewrite preinit as very small C program By using the kernel "nolibc" header to avoid requiring a C library, we can bring the initramfs size to around 4k This does involve a tiny bit of inline mips assembly which I'm not sure about. gcc seems unwilling to generate the code to load $gp at function entry of main(), so we do it by hand - but I'd rather find out why gcc doesn't.
2023-04-15 16:35:02 +00:00
'';
makeFlags = ["preinit"];
stripAllList = ["bin"];
installPhase = ''
mkdir -p $out/bin
cp preinit $out/bin
'';
}