pushfw
Push flags, 16-bit
Pushes the low 16 bits of rflags onto the stack as a word and decrements rsp by 2.
8086 and later
CFPFAFZFSFDFOF –––––––
- Changes no flag
- Reads CF PF AF ZF SF TF IF DF OF
Forms
pushfw
In 64-bit mode, pushf / pushfq subtract 8 from rsp and store a 64-bit image; pushfw subtracts 2 and stores the low 16 bits. pushfd is unavailable in this mode. The pushed 64-bit image has RF and VM cleared; it is not an exact copy of every bit of rflags.
global _start
section .text
_start:
mov rax, 12
mov rbx, 5
mov rcx, 3
mov rsi, 9
pushfw
mov rax, 60 ; syscall 60: exit
xor rdi, rdi
syscall