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                ## 14.2 寄存器和指令 實地址模式下的寄存器集合包括8086定義的所有寄存器,加上80386新引入的寄存器:FS, GS, 調試寄存器,控制寄存器,和測試寄存器。可以顯式的使用段寄存器FS和GS作為操作數,而且可以使用新引入的段-重寫前綴來利用FS和GS來計算地址。指令可以利用操作數長度前綴來使用32位操作數。 保護模式下操作,檢查80386選擇符和描述符的指令導致未定義操作碼陷阱(中斷6);這些指令包括:VERR, VERM, LAR, LSL, LTR, STR, LLDT和SLDT。在實地址模式下執行的程序可以通過80186/80188, 80286和80386的介紹來使用新加入的應用導向指令。 + New instructions introduced by 80186/80188 and 80286. + PUSH immediate data + Push all and pop all (PUSHA and POPA) + Multiply immediate data + Shift and rotate by immediate count + String I/O + ENTER and LEAVE + BOUND + New instructions introduced by 80386. + LSS, LFS, LGS instructions + Long-displacement conditional jumps + Single-bit instructions + Bit scan + Double-shift instructions + Byte set on condition + Move with sign/zero extension + Generalized multiply + MOV to and from control registers + MOV to and from test registers + MOV to and from debug registers
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