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Add and link article about cross compiling binutils

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Philipp Oppermann
2015-10-24 15:54:59 +02:00
parent 2f64af811e
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_posts/2015-08-18-multiboot-kernel.md
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@@ -172,6 +172,8 @@ Idx Name Size VMA LMA File off Algn
1 .text 0000000b 0000000000100020 0000000000100020 000000a0 2**4
CONTENTS, ALLOC, LOAD, READONLY, CODE
```
_Note_: The `ld` and `objdump` commands are platform specific. If you're not working on x86_64 architecture, you will need to [cross compile binutils]. Then use `x86_64-elf-ld` and `x86_64-elf-objdump` instead of `ld` and `objdump`.
[cross compile binutils]: {{ site.url }}/rust-os/cross-compile-binutils.html
## Creating the ISO
The last step is to create a bootable ISO image with GRUB. We need to create the following directory structure and copy the `kernel.bin` to the right place:
@@ -283,6 +285,7 @@ Some comments (see the [Makefile tutorial] if you don't know `make`):
- the `$(wildcard src/arch/$(arch)/*.asm)` chooses all assembly files in the src/arch/$(arch)` directory, so you don't have to update the Makefile when you add a file
- the `patsubst` operation for `assembly_object_files` just translates `src/arch/$(arch)/XYZ.asm` to `build/arch/$(arch)/XYZ.o`
- the `$<` and `$@` in the assembly target are [automatic variables]
- if you're using [cross-compiled binutils][cross compile binutils] just replace `ld` with `x86_64-elf-ld`
[automatic variables]: https://www.gnu.org/software/make/manual/html_node/Automatic-Variables.html