I am getting the following error when trying to compile the code at the end of video 3

Invalid 'asm': invalid expression as operand about wyoos HOT 2 CLOSED

wiltaylor commented on June 7, 2024

Invalid 'asm': invalid expression as operand

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Comments (2)

M1sterPl0w commented on June 7, 2024 1

I am using the following version: "gcc (Ubuntu 10.3.0-1ubuntu1) 10.3.0" And it works well. My guess would be that you haven't installed GCC correctly.

What happens when use __asm__ instead asm these happens to be different. stackoverflow

__asm__ volatile("lgdt (%0)" : : "p"(((uint8_t *) i)+2));

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wiltaylor commented on June 7, 2024

Thanks for the reply. It was indeed a bunch of missing packages. I added a few more to my development environment and was able to get it working.

Here is the nix flake with the working development environment.

{
  description = "Development Environment For OS tutorial";
  inputs = {
    nixpkgs.url = "nixpkgs/nixos-unstable";
  };

  outputs = { self, nixpkgs }:
  let
    pkgs = nixpkgs.legacyPackages.x86_64-linux;

  in {
    devShell.x86_64-linux = pkgs.pkgsi686Linux.mkShell {
      buildInputs = with pkgs; [
        gcc
        nasm
        gnumake
        valgrind
        inetutils
        grub2
        binutils
        xorriso
      ];

      shellHook = ''
        ${pkgs.figlet}/bin/figlet "OS Development Tutorial"     
      '';
    };
  };
}