rasp/examples/strings.asm

.section data $0x1000 .. $0x1100 {
    zstr: .zstring  "This is a string"
    str: .string  "This is a string"

    .export zstr
    .export str
}

.section code $0x0 {
    ; Take the length of a zstr without those fancy "function calls" and "stack frames"
    ; %r0: the input string (in)
    ; %r1: the return address (in)
    ; %r2: the length of the string (out)

    zstrlen:
        mov %r2, %r0
    ztrlen_loop:
        cmpeq (%r2)u8, $0
    zstrlen_end:
        jmp %r1

    main:
        halt
        
    .export main
}

.meta {
    entry: main
}