.intel_syntax noprefix

    .globl _start

    .text


# String-copying routine.
# Commented-out lines would also return the starting address of the destination address.
strcpy:
#    push rsi
.loop:
    movb r10b, [rdi]
    cmpb r10b, 0
    je .end
    movb [rsi], r10b
    inc rdi
    inc rsi
    jmp .loop
.end:
#    pop rax
    ret