ROR - x86-64 instruction reference

rorRotate right 
Rotates the destination right by the given count; bits shifted out of the bottom re-enter at the top.
8086 and later
Intel's reference: RCL/RCR/ROL/ROR 
CFPFAFZFSFDFOF ●–––––?
● set from the result
? undefined afterwards
– not changed
OF Defined only for a count of 1.
A count of 0 leaves every flag unchanged.
Forms  ror ,  8163264 
 ror , 1 8163264 
 ror , cl 8163264 
Operands r/m A general-purpose register or memory location matching the operation’s size, for example rax or qword [rbp-8]. The byte registers ah, bh, ch and dh cannot be used with a REX prefix, including when the memory address uses r8–r15. 
imm8 An 8-bit immediate, -128 to 255. Instructions that sign-extend it to a wider operand interpret the byte as -128 to 127; shift counts do not use this sign extension. 
CF receives the last bit rotated out, and OF is defined only for a count of one.
The count comes from an immediate or cl. It is first masked to six bits for a 64-bit operand or five bits for smaller operands, then reduced modulo the operand width for the rotation. A 64-bit rotation by 32 therefore exchanges the two 32-bit halves; a count of 64 masks to zero.
 global _start

section .text
_start:
        mov rax, 12
        mov rbx, 5
        mov rcx, 3
        mov rsi, 9

        ror rax, 1

        mov rax, 60         ; syscall 60: exit
        xor rdi, rdi
        syscall