unsafe {
asm!(
"mov edi, 42",
"mov eax, 60",
"syscall",
options(nostack, noreturn)
)
// nostack prevents `asm!` from push/pop rax
// noreturn prevents it putting a 'ret' at the end
// but it does put a ud2 (undefined instruction) instead
}
and
> We will need to tell the C compiler that we’re providing our own entry point, telling it not to include it’s own start files.
So it's a Rust program but it's just calling inline assembly and using a C compiler?
unsafe { asm!( "mov edi, 42", "mov eax, 60", "syscall", options(nostack, noreturn) ) // nostack prevents `asm!` from push/pop rax // noreturn prevents it putting a 'ret' at the end // but it does put a ud2 (undefined instruction) instead }
and
> We will need to tell the C compiler that we’re providing our own entry point, telling it not to include it’s own start files.
So it's a Rust program but it's just calling inline assembly and using a C compiler?