pushf
Push flags (default size)
Pushes rflags onto the stack as an 8-byte value and decrements rsp by 8.
8086 and later
CFPFAFZFSFDFOF –––––––
- Changes no flag
- Reads CF PF AF ZF SF TF IF DF OF
Forms
pushf
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
pushf
mov rax, 60 ; syscall 60: exit
xor rdi, rdi
syscall