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Vol. 3 17-5
8086 EMULATION
• Move (MOV) instructions that move operands between general-purpose
registers, segment registers, and between memory and general-purpose
registers.
• The exchange (XCHG) instruction.
• Load segment register instructions LDS and LES.
• Arithmetic instructions ADD, ADC, SUB, SBB, MUL, IMUL, DIV, IDIV, INC, DEC,
CMP, and NEG.
• Logical instructions AND, OR, XOR, and NOT.
• Decimal instructions DAA, DAS, AAA, AAS, AAM, and AAD.
• Stack instructions PUSH and POP (to general-purpose registers and segment
registers).
• Type conversion instructions CWD, CDQ, CBW, and CWDE.
• Shift and rotate instructions SAL, SHL, SHR, SAR, ROL, ROR, RCL, and RCR.
• TEST instruction.
• Control instructions JMP, Jcc, CALL, RET, LOOP, LOOPE, and LOOPNE.
• Interrupt instructions INT n, INTO, and IRET.
• EFLAGS control instructions STC, CLC, CMC, CLD, STD, LAHF, SAHF, PUSHF, and
POPF.
• I/O instructions IN, INS, OUT, and OUTS.
• Load effective address (LEA) instruction, and translate (XLATB) instruction.
• LOCK prefix.
• Repeat prefixes REP, REPE, REPZ, REPNE, and REPNZ.
• Processor halt (HLT) instruction.
• No operation (NOP) instruction.
The following instructions, added to later IA-32 processors (some in the Intel 286
processor and the remainder in the Intel386 processor), can be executed in real-
address mode, if backwards compatibility to the Intel 8086 processor is not required.
• Move (MOV) instructions that operate on the control and debug registers.
• Load segment register instructions LSS, LFS, and LGS.
• Generalized multiply instructions and multiply immediate data.
• Shift and rotate by immediate counts.
• Stack instructions PUSHA, PUSHAD, POPA and POPAD, and PUSH immediate
data.
• Move with sign extension instructions MOVSX and MOVZX.
• Long-displacement Jcc instructions.
• Exchange instructions CMPXCHG, CMPXCHG8B, and XADD.
• String instructions MOVS, CMPS, SCAS, LODS, and STOS.