郁金香vc基礎(chǔ)視頻教程31-55合購vip收集-39.串指令

4、串指移動串指令MOVSB、MOVSW、MOVSD;從ESIEDI執(zhí)行后ESIEDI比較串指令CMPSB、CMPSW、CMPSD;ESI、EDI執(zhí)行后ESIEDI的地址掃描串指令SCASB、SCASW、SCASD;AL/AX/EAXEDI指向的數(shù)據(jù),執(zhí)行后EDI自動變化串指令:STOSB、STOSW、STOSD;將AL/AX/EAX中的數(shù)據(jù)到EDI給出的地址,執(zhí)行后EDI自動變化載入串指令:LODSB、LODSW、LODSD;將ESI指向的數(shù)據(jù)載入到AL/AX/EAX執(zhí)行后ESI自動變化B、W、DByte、Word、DWord表示每次操作的數(shù)據(jù)的大小單位 ECX0REPE(REPZ)ECX0ZF=1REPNE(REPNZECX0ZF=0;重復(fù)前綴可以自動按單位(1、2、4)mainmainendpendmainMOVSB:;.modelflat, includelibkernel32.libincludelibmasm32.libincludelibdebug.libszSourcedb'Delphi2010',0lenequ$-szSource-1szDestdblendup(?),0mainprocleaesi,szSourceleaedi,szDestmovecx,lencld;復(fù)位標志寄存器的方向標志repPrintStringszDest;Delphi上面的例子,假如不使用重復(fù)前綴;.modelflat, includelibkernel32.libincludelibmasm32.libincludelibdebug.libszSourcedb'Delphi2010',0lenequ$-szSource-1szDestdblendup(?),0mainprocleaesi,szSourceleaedi,szDestmovecx,len@@:dececxjnz@BPrintStringMOVSD例;.modelflat, includelibkernel32.libincludelibmasm32.libincludelibdebug.libddSourcedd ddlengthofddSourcemainprocleaesi,leaedi,movecx,lengthofrepDumpMemoffsetddDest,sizeofddDest;11000000-220000-330000mainendpendmainMOVSW例;.modelflat, includelibkernel32.libincludelibmasm32.libincludelibdebug.libddSourcedw dwlengthofddSourcemainprocleaesi,leaedi,movecx,lengthofrepDumpMemoffsetddDest,sizeofddDest;11002200-330000mainendpendmainCMPSD例;.modelflat,;;.modelflat, includelibkernel32.libincludelibmasm32.libincludelibdebug.libddVal1dd1234hddVal2ddmainprocleaesi,ddVal1leaedi,ddVal2jePrintText兩數(shù)不等jmpL1PrintText兩數(shù)相等L2:retmainendpendmainCMPSW例 includelibkernel32.libincludelibmasm32.libincludelibdebug.libdwArr1dwdwArr2dwmainprocleaesi,leaedi,movecx,lengthofrepecmpswjeL1PrintText兩數(shù)組不等jmpL1PrintText兩數(shù)組相等L2:retmainendpendmain對比數(shù)組時,假如數(shù)組長度不一致;;.modelflat, includelibkernel32.libincludelibmasm32.libincludelibdebug.libdwArr1dwdwArr2dwmainprocleaesi,leaedi,movecx,lengthofdwArr1cmpecx,lengthofdwArr2jneL1repecmpswjneL1PrintText兩數(shù)組相等jmpL1PrintText兩數(shù)組不等L2:retmainendpendmain如果對比的是0結(jié)束的字符串, includelibkernel32.libincludelibmasm32.libincludelibdebug.libszText1db'Delphi2010',szText2db'Delphi2011',mainprocleaesi,leaedi,movecx,lengthofrepecmpsbjeL1PrintText字符串不同jmpL1PrintText字符串相同L2:retmainendpendmainSCASB例 includelibkernel32.libincludelibmasm32.libincludelibdebug.libszTextdb'ABCDEFGH',mainprocleaedi,moval,movecx,lengthofszText-repnescasbjeL1PrintText沒找到j(luò)mpL1:subecx,lengthofszText-negPrintDececx;如果找得到這里顯示是第幾個字符6L2:retmainendpendmainSTOSB例;.modelflat, includelibkernel32.libincludelibmasm32.libincludelibdebug.liblen=szTextdblendup(0),mainprocleaedi,moval,'x'movecx,lenrepPrintStringszTextmainendpendmainLODSW例:;.modelflat, includelibkernel32.libinc