rasp/examples/strings.asm

data $0x1000 .. $0x1100 {
    zstr: .zstring  "This is a zero-terminated string"

    .export zstr
}

code $0x0 {
    zstr_len:
        storeimm32 %r15, $0xFF
        storeimm32 %r16, $1
        storeimm64 %r20, zstr_next
        storeimm64 %r21, exit_zstr

        regcopy %r10, %r00

    zstr_next:
        load %r11, %r10
        and %r11, %r15
        cmpeq %r11, %null
        jnz %r21
        add %r10, %r16
        jmp %r20

    main:
        storeimm64 %r05, zstr_len
        storeimm64 %r00, zstr
        jmp %r05

    exit_zstr:
        regcopy %status, %r10
        halt
    
        ineg %r00
        add %r10, %r00
        regcopy %status, %r10

    end:
        halt

    .export main
}

meta {
    entry: main
}