Assembler äëÿ íà÷èíàþùèõ
ê íåé. Çàìåòüòå, ÷òî ìàêðîêîìàíäà
ñîõðàíèòü ýòîò ñïîñîá è äëÿ ïðîãðàììèðîâàíèÿ ñîïðîöåññîðà 8087.
Íà Ôèã.6.3 ïðèâîäèòñÿ ìàêðîêîìàíäà FLDCW è íåñêîëüêî îáðàøåíèé
ê íåé. Çàìåòüòå, ÷òî ìàêðîêîìàíäà FLDCW èñïîëüçóåò â êà÷åñòâå
ïàðàìåòðà ñèìâîëè÷åñêîå èìÿ "SOURCE". Ïàðàìåòð SOURCE ÿâëÿåòñÿ
àäðåñîì, ñ êîòîðîãî ñîïðîöåññîð 8087 çàãðóæàåò óïðàâëÿþùåå ñëîâî.
Äëÿ ãåíåðàöèè òðåáóåìîãî ìàøèííîãî êîäà ìàêðîêîìàíäà FLDCW
èñïîëüçóåò êîìàíäó 8088 ESC. Îäíàêî äëÿ òîãî, ÷òîáû îïðåäåëèòü áàéò
mod=r/m êîìàíäû, êîìàíäå ESC òðåáóåòñÿ çíà÷åíèå àäðåñà. Êàê ðàç äëÿ
Microsoft (R) Macro Assembler Version 5.00 1/1/80 04:02:47
Ôèã. 6.3 Ìàêðîêîìàíäà äëÿ êîìàíäû FLDCW Page 1-1
PAGE ,132
TITLE Ôèã. 6.3 Ìàêðîêîìàíäà äëÿ êîìàíäû FLDCW
FLDCW MACRO SOURCE
DB 09BH
ESC 0DH, SOURCE
ENDM
0000 CODE SEGMENT
ASSUME CS:CODE
0000 ???? MEMORY_LOCATION DW ?
FLDCW MEMORY_LOCATION
0002 9B 1 DB 09BH
0003 2E: D9 2E 0000 R 1 ESC 0DH, MEMORY_LOCATION
FLDCW ES:[DI]
0008 9B 1 DB 09BH
0009 26: D9 2D 1 ESC 0DH, ES:[DI]
FLDCW MEMORY_LOCATION[BX+SI]
000C 9B 1 DB 09BH
000D 2E: D9 A8 0000 R 1 ESC 0DH, MEMORY_LOCATION[BX+SI]
0012 CODE ENDS
END
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