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Vol. 2A 3-671
INSTRUCTION SET REFERENCE, A-M
MOVS/MOVSB/MOVSW/MOVSD/MOVSQ—Move Data from String to String
(R|E)SI ← (R|E)SI + 4;
(R|E)DI ← (R|E)DI + 4;
FI;
ELSE
(R|E)SI ← (R|E)SI – 4;
(R|E)DI ← (R|E)DI – 4;
FI;
ELSE IF (Quadword move)
THEN IF DF
= 0
(R|E)SI ← (R|E)SI + 8;
(R|E)DI ← (R|E)DI + 8;
FI;
ELSE
(R|E)SI ← (R|E)SI – 8;
(R|E)DI ← (R|E)DI – 8;
FI;
FI;
Flags Affected
None.
Protected Mode Exceptions
#GP(0) If the destination is located in a non-writable segment.
If a memory operand effective address is outside the CS, DS,
ES, FS, or GS segment limit.
If the DS, ES, FS, or GS register contains a NULL segment
selector.
#SS(0) If a memory operand effective address is outside the SS
segment limit.
#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.
#UD If the LOCK prefix is used.
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.
#UD If the LOCK prefix is used.