Port our first executable

[d4ilyrun]

Binary execution

Now that we have a (semi) functioning userland, it is possible for us to execute compiled binaries. To complete this important step of our kernel, we need to be able to load an executable, setup the new process's memory and execute the binary's code.

Executable format

To start with, we'll only support the most common executable format: ELF.

ABI

Even though we have already implemented a syscall interface, it will be necessary to actually implement the most common ones that are still missing (open, read, write, ...). We'll also have to compile the binaries ourselves for them to work with our syscall ABI.

TODO

• Load and execute an ELF binary (a16dca7)
• Setup a custom GCC target for our kernel's ABI merge(toolchain): create an OS-specific toolchain #29
• Port an already existing libc implementation merge(toolchain): port an existing libc implementation #30