Any idea what might cause this? My rust is at f254d119eab514c91fbd6590fba821ec7a0bfd7f.

nasm -o loader.bin -f bin loader.asm
nasm -f elf32 -o runtime.o runtime.asm
rustc -O --target i386-intel-linux --lib -o main.o -c main.rs
warning: missing crate link meta `name`, using `main` as default
warning: missing crate link meta `vers`, using `0.0` as default
i386-elf-ld -o main.bin -T linker.ld runtime.o main.o
make: i386-elf-ld: No such file or directory
make: *** [main.bin] Error 1

Awesome stuff. To ensure it is useful as widely as possible, please consider putting the project into the public domain with http://unlicense.org/ or CC0.

For instance, there are people writing public domain bootloaders and kernels on GitHub:

https://github.com/shonma29/eotan/blob/master/drivers/i686/startup.s https://github.com/search?o=desc&p=1&q=UNLICENSE&s=indexed&type=Code

...and they wouldn't be able to utilize your code if it is MIT-licensed.

I am not sure if this is a problem with the version of the rust compiler used or what not. PS I am running on a OSX machine.

rustboot:$ make rustc -O --target i386-intel-linux --lib -o main.o -c main.rs error: Unrecognized option: 'lib'. make: *** [main.o] Error 101

rustc --version rustc 0.10-pre (9e89ffc 2014-03-16 14:11:26 -0700) host: x86_64-apple-darwin

Also I believe I have the latest version of the rustboot code.

rustboot:$ git pull Already up-to-date.

#[allow(ctypes)];
#[no_std];
#[no_core];

mod zero;

enum Color {
    Black       = 0,
    Blue        = 1,
    Green       = 2,
    Cyan        = 3,
    Red         = 4,
    Pink        = 5,
    Brown       = 6,
    LightGray   = 7,
    DarkGray    = 8,
    LightBlue   = 9,
    LightGreen  = 10,
    LightCyan   = 11,
    LightRed    = 12,
    LightPink   = 13,
    Yellow      = 14,
    White       = 15,
}

fn range(lo: uint, hi: uint, it: &fn(uint)) {
    let mut iter = lo;
    while iter < hi {
        it(iter);
        iter += 1;
    }
}

unsafe fn print_screen(i: uint, ch: u8) {
    *((0xb8000 + i * 2) as *mut u8) = ch;
}

unsafe fn set_color(i: uint, foreground: Color, background: Color) {
    *((0xb8000 + i * 2 + 1) as *mut u8) = ((background as u8) << 4) ^ (foreground as u8);
}

unsafe fn clear_screen(foreground: Color, background: Color) {
    range(0, 80*25, |i| {
        set_color(i, foreground, background);
        print_screen(i, 0)
    });
}

fn is_char(ch: u8) -> bool {
    return (ch >= 97 && ch <= 122) ||
           (ch >= 65 && ch <= 90);
}

fn is_whitespace(ch: u8) -> bool {
    return (ch == 32);
}

pub fn len(s: &str) -> uint {
    let mut i: uint = 0;
    while is_char(s[i]) {
        i += 1;
    }
    return i;
}

unsafe fn print_num(number: uint)
{
    let mut j = 0;
    let mut i = number;
    while i != 0 {
        let sym = i % 10 as u8;
        print_screen(j, sym + 48);
        j += 1;
        i = i / 10;
    }
}

#[no_mangle]
pub unsafe fn main() {
    let string: &str = "Hello World";
    let length = len(string);
    clear_screen(White, Blue);
    range(0, length, |i| {
        print_screen(i, string[i] as u8)
    });
    print_num(length);
}

This program should return 5ello, first printing 'Hello' and then printing '5'. However, it just prints 5, if I change the length variable to 5, it will print out 5ello. I am confused at what is happening, maybe someone with deeper asm knowledge could explain?

This pull request has the same content as pull request #27 but is from a different branch since I want to use the master branch in my fork for further development. Sorry about the confusion!

Hey, Could you mention pczarn's fork of rustboot, at https://github.com/pczarn/rustboot, on your README? It's still under active development, yet it's overshadowed in the search results by this repository.

After building, it fails to run in QEMU on OSX

NASM version is 2.10.07 QEMU version is 1.4.1 rustc version is 0.6 (a394298 2013-05-30 10:37:46 -0700)

nasm -o loader.bin -f bin loader.asm
nasm -f elf32 -o runtime.o runtime.asm
rustc -O --target i386-intel-linux --lib -o main.o -c main.rs
warning: missing crate link meta `name`, using `main` as default
warning: missing crate link meta `vers`, using `0.0` as default
i386-elf-ld -o main.bin -T linker.ld runtime.o main.o
cat loader.bin main.bin > floppy.img
qemu-system-i386 -fda floppy.img
qemu: fatal: Trying to execute code outside RAM or ROM at 0x000a0000

EAX=00007bc7 EBX=00007e20 ECX=00000000 EDX=00000000
ESI=0000fe10 EDI=00000000 EBP=00007bf7 ESP=00007bab
EIP=0009ffb0 EFL=00000002 [-------] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =0010 00000000 000fffff 004f9300 DPL=0 DS   [-WA]
CS =0008 00000000 000fffff 004f9a00 DPL=0 CS32 [-R-]
SS =0010 00000000 000fffff 004f9300 DPL=0 DS   [-WA]
DS =0010 00000000 000fffff 004f9300 DPL=0 DS   [-WA]
FS =0010 00000000 000fffff 004f9300 DPL=0 DS   [-WA]
GS =0010 00000000 000fffff 004f9300 DPL=0 DS   [-WA]
LDT=0000 00000000 0000ffff 00008200 DPL=0 LDT
TR =0000 00000000 0000ffff 00008b00 DPL=0 TSS32-busy
GDT=     00007c91 00000019
IDT=     00000000 00000000
CR0=00000011 CR2=00000000 CR3=00000000 CR4=00000000
DR0=00000000 DR1=00000000 DR2=00000000 DR3=00000000 
DR6=ffff0ff0 DR7=00000400
CCS=00007bc7 CCD=00007c28 CCO=ADDB    
EFER=0000000000000000
FCW=037f FSW=0000 [ST=0] FTW=00 MXCSR=00001f80
FPR0=0000000000000000 0000 FPR1=0000000000000000 0000
FPR2=0000000000000000 0000 FPR3=0000000000000000 0000
FPR4=0000000000000000 0000 FPR5=0000000000000000 0000
FPR6=0000000000000000 0000 FPR7=0000000000000000 0000
XMM00=00000000000000000000000000000000 XMM01=00000000000000000000000000000000
XMM02=00000000000000000000000000000000 XMM03=00000000000000000000000000000000
XMM04=00000000000000000000000000000000 XMM05=00000000000000000000000000000000
XMM06=00000000000000000000000000000000 XMM07=00000000000000000000000000000000
make: *** [run] Abort trap: 6

Collins-MacBook-Air:rustboot collinglass$ make
nasm -o loader.bin -f bin loader.asm
loader.asm:82: error: expression syntax error
loader.asm:89: error: expression syntax error
make: *** [loader.bin] Error 1

When trying to build the kernel with v0.12 of the rustc compiler I recieve the error

rustc -O --target i386-intel-linux --crate-type lib -o main.o --emit obj main.rs
error: requires `sized` lang_item
error: aborting due to previous error
Makefile:13: recipe for target 'main.o' failed
make: *** [main.o] Error 101

I believe this has to do with changes to the language, and I have made changes which allow it to complile https://github.com/ragingSloth/rustboot/blob/39d3187f0f7e77501f58ae7b271dc27dab3035b8/main.rs

Rust can't compile truly freestanding, position-dependent code. It attempts to access global variables through _GLOBAL_OFFSET_TABLE_.

Currently it seems the best workaround is to compile emitted LLVM bitcode with clang -ffreestanding. However, optimizations made by clang could break things.

When running make, it spits out this error message.

rustc -O --target i386-intel-linux --lib -o main.o -c main.rs
error: no item found for `ty_desc`
error: no item found for `opaque`
error: no item found for `ty_visitor`
error: no item found for `freeze`
error: no item found for `send`
error: no item found for `closure_exchange_malloc`
error: aborting due to 6 previous errors
make: *** [main.o] Error 101

It seems dependent on some part of the rust runtime? maybe?

I'm running rustc version 0.7

rustc 0.7
host: x86_64-apple-darwin

any tips you can give?

I followed the steps given on README.md After all the prerequisites I cloned the rustboot exported all the PATH $~ echo $PATH /home/sagar.sakre/binutils/i386-elf/bin/:/home/sagar.sakre/binutils/bin/:/home/sagar.sakre/rust-bin/bin/:/opt/qemu/bin/4.4.3/bin/:/opt/qemu/bin/:/home/nithin/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games

I got error while make.. sagar.sakre@sagar-vm ~ $ cd rustboot/ sagar.sakre@sagar-vm ~/rustboot $ ls LICENSE.txt linker.ld loader.asm main.rs Makefile README.md runtime.asm zero.rs sagar.sakre@sagar-vm ~/rustboot $ make nasm -o loader.bin -f bin loader.asm nasm -f elf32 -o runtime.o runtime.asm rustc -O --target i386-intel-linux --lib -o main.o -c main.rs error: no item found for sized error: aborting due to previous error make: *** [main.o] Error 101

can you please tel me where I am goin wrong?