; strlen
bits 64

; program being used for Pin exercise

    SECTION .data
mystr1: db 'string1',0
mystr2: db 'string2',0
mystr3: db 'string3',0

    SECTION .text

myfun1:
    push rbp
    mov rbp, rsp
    xor rax, rax
    lea rax, [rax]
    leave
    ret

myfun2:
    push rbp
    mov rbp, rsp
    mov rcx, rsi            ; second param, len in bytes
    test rcx, rcx
    jz .done
.encrypt:
    xor byte [rdi], 0x42    ; first param, pointer to byte array that needs en- or decryption
    inc rdi
    loop .encrypt
.done:
    leave
    ret

myfun3:
    push rbp
    mov rbp, rsp
    xor rax, rax
    add rax, rdi ; first param
    add rax, rsi ; second param
    leave
    ret

global _start
_start:
    %include "macros.asm.inc"
    ;%include "header.asm.inc"

    mov rdi, 5
    mov rsi, 10
    call myfun3

    call myfun1
    call myfun1
    call myfun1
    call myfun1
    call myfun1

    ; encrypt
    mov rdi, mystr1
    mov rsi, 7
    call myfun2

    ; write mystr1 to stdout
    sys_write 1, mystr1, 7

    %include "sysexit.asm.inc"