Intel 64 and IA-32 Architectures Software Developers Manual Volume 1, Basic Architecture

Vol. 1 5-9
INSTRUCTION SET SUMMARY
OUTS/OUTSB Output string to port/Output byte string to port
OUTS/OUTSW Output string to port/Output word string to port
OUTS/OUTSD Output string to port/Output doubleword string to port
5.1.10 Enter and Leave Instructions
These instructions provide machine-language support for procedure calls in block-
structured languages.
ENTER High-level procedure entry
LEAVE High-level procedure exit
5.1.11 Flag Control (EFLAG) Instructions
The flag control instructions operate on the flags in the EFLAGS register.
STC Set carry flag
CLC Clear the carry flag
CMC Complement the carry flag
CLD Clear the direction flag
STD Set direction flag
LAHF Load flags into AH register
SAHF Store AH register into flags
PUSHF/PUSHFD Push EFLAGS onto stack
POPF/POPFD Pop EFLAGS from stack
STI Set interrupt flag
CLI Clear the interrupt flag
5.1.12 Segment Register Instructions
The segment register instructions allow far pointers (segment addresses) to be
loaded into the segment registers.
LDS Load far pointer using DS
LES Load far pointer using ES
LFS Load far pointer using FS
LGS Load far pointer using GS
LSS Load far pointer using SS