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INSTRUCTION SET REFERENCE
OUTS/OUTSB/OUTSW/OUTSD—Output String to Port (Continued)
Protected Mode Exceptions
#GP(0)
If the CPL is greater than (has less privilege) the I/O privilege level (IOPL)
and any of the corresponding I/O permission bits in TSS for the I/O port
being accessed is 1.
If a memory operand effective address is outside the limit of the CS, DS,
ES, FS, or GS segment.
If the segment register contains a null segment selector.
#PF(fault-code)If a page fault occurs.
#AC(0)
If alignment checking is enabled and an unaligned memory reference is
made while the current privilege level is 3.
Real-Address Mode Exceptions
#GP
If a memory operand effective address is outside the CS, DS, ES, FS, or
GS segment limit.
#SS
If a memory operand effective address is outside the SS segment limit.
Virtual-8086 Mode Exceptions
#GP(0)
If any of the I/O permission bits in the TSS for the I/O port being accessed
is 1.
#PF(fault-code)If a page fault occurs.
#AC(0)
If alignment checking is enabled and an unaligned memory reference is
made.
