%include "CONSTANTS.h"

section .data
     DataFormat: db `R14 holds %\#qx\n`,0
     FlagFormat: db `The current flag register holds %\#qb\n`,0
     CaryFormat: db     `\tThe carry flag is      %\#qb\n`,0
     ParityFormat: db   `\tThe parity flag is     %\#qb\n`,0
     ZeroFormat: db     `\tThe zero flag is       %\#qb\n`,0
     SignFormat: db     `\tThe sign flag is       %\#qb\n`,0
     OverflowFormat: db `\tThe Overflow flag is   %\#qb\n`,0

     endl: db `\n`,0
    
     CARRY_FLAG: dq 0x1
     PARITY_FLAG: dq 4h
     ZERO_FLAG: dq 40h
     SIGN_FLAG: dq 80h
     OVERFLOW_FLAG: dq 800h
section .bss

section .text

global main
main:

    ; do some math to make r14 hold a 1, or odd parity
    mov r14, 0
    inc r14

    ; save the flag register and put it in rsi
    pushfq
    pop r12
    call PrintFlags

    ;  do some math to make r14 hold a 3, or even parity
    inc r14
    inc r14

    pushfq
    pop r12
    call PrintFlags

    ; let's get a zero
    sub r14, 3

    pushfq
    pop r12
    call PrintFlags

    ; make it negative
    dec r14

    pushfq
    pop r12
    call PrintFlags

    ;  let's make an overflow
    mov R14, 7fffffffffffffffh
    add R14, 1 
    pushfq
    pop r12
    call PrintFlags

    jmp Exit


PrintFlags:
    push R12

    mov rsi, r14
    mov rdi, DataFormat
    call CallPrintf

    ; save the flags in r12 
    mov rsi, r12
    mov rdi, FlagFormat
    call CallPrintf 

    mov rsi, r12
    and rsi, [CARRY_FLAG]
    mov rdi, CaryFormat
    call CallPrintf 

    mov rsi, r12
    and rsi, [PARITY_FLAG]
    mov rdi, ParityFormat
    call CallPrintf 

    mov rsi, r12
    and rsi, [ZERO_FLAG]
    mov rdi, ZeroFormat
    call CallPrintf 

    mov rsi, r12
    and rsi, [SIGN_FLAG]
    mov rdi, SignFormat
    call CallPrintf 

    mov rsi, r12
    and rsi, [OVERFLOW_FLAG]
    mov rdi, OverflowFormat
    call CallPrintf 

    mov rdi, endl;
    call CallPrintf

    pop r12
    ret