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STR -- Store Task Register

Opcode        Instruction   Clocks       Description

0F  00 /1     STR r/m16     pm=23/27     Load EA word into task register

Operation

r/m := task register;

Description

The contents of the task register are copied to the two-byte register or memory location indicated by the effective address operand.

STR is used only in operating system software. It is not used in application programs.

Flags Affected

None

Protected Mode Exceptions

#GP(0) if the result is in a nonwritable segment; #GP(0) for an illegal memory operand effective address in the CS, DS, ES, FS, or GS segments; #SS(0) for an illegal address in the SS segment; #PF(fault-code) for a page fault

Real Address Mode Exceptions

Interrupt 6; STR is not recognized in Real Address Mode

Virtual 8086 Mode Exceptions

Same exceptions as in Real Address Mode

Notes

The operand-size attribute has no effect on this instruction.

up: Chapter 17 -- 80386 Instruction Set
prev: STOS/STOSB/STOSW/STOSD Store String Data
next: SUB Integer Subtraction