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Systems Design & Programming 80x86 Assembly III CMPE 3101 (Mar. 1, 2002)UMBCU M B CUNIVERSITY OF MARYLAND BALTIMORE COUNTY1 9 6 6 Systems Design & Programming 80x86 Assembly III CMPE 3102 (Mar. 1, 2002)UMBCU M B CUNIVERSITY OF MARYLAND BALTIMORE COUNTY1 9 6 6Stack Instructions Systems Design & Programming 80x86 Assembly III CMPE 3103 (Mar. 1, 2002)UMBCU M B CUNIVERSITY OF MARYLAND BALTIMORE COUNTY1 9 6 6Stack InstructionsStack Segpush eax0 7 F EAHALesp = esp-4is performedbefore thePUSH000007FA isnew value0 0 1 0+SegBasePagingTrans.FFFF6AB36 A B 3F F F F0 0 0 0 Systems Design & Programming 80x86 Assembly III CMPE 3104 (Mar. 1, 2002)UMBCU M B CUNIVERSITY OF MARYLAND BALTIMORE COUNTY1 9 6 6Address Loading Instructionslds edi, LIST ;Loads edi and ds.lea eax,[ebx+ecx*4+100] ;Loads eax with computed address.lfs esi, DATA1 ;Loads esi and fs. Systems Design & Programming 80x86 Assembly III CMPE 3105 (Mar. 1, 2002)UMBCU M B CUNIVERSITY OF MARYLAND BALTIMORE COUNTY1 9 6 6Address Loading Instructionsmov ebx, edi;Move the contents of edi into ebx.lea ebx, [edi];Load the contents of edi into ebx.mov ebx, [edi];Load the value at edi into ebx. Systems Design & Programming 80x86 Assembly III CMPE 3106 (Mar. 1, 2002)UMBCU M B CUNIVERSITY OF MARYLAND BALTIMORE COUNTY1 9 6 6String Operations Systems Design & Programming 80x86 Assembly III CMPE 3107 (Mar. 1, 2002)UMBCU M B CUNIVERSITY OF MARYLAND BALTIMORE COUNTY1 9 6 6String Operationslodsb;al=ds:[esi]; esi=esi+/-1lodsd;eax=ds:[esi]; esi=esi+/-4es lodsb DATA1;Override ds.stosb;es:[edi]=al; edi=edi+/-1stosd;es:[edi]=eax; edi=edi+/-4 Systems Design & Programming 80x86 Assembly III CMPE 3108 (Mar. 1, 2002)UMBCU M B CUNIVERSITY OF MARYLAND BALTIMORE COUNTY1 9 6 6String OperationslodswData Seg1 0 0 0A032A 0 3 2+/-20 0 1 0+SegBasePagingTrans.0 0 0 0 Systems Design & Programming 80x86 Assembly III CMPE 3109 (Mar. 1, 2002)UMBCU M B CUNIVERSITY OF MARYLAND BALTIMORE COUNTY1 9 6 6String Operationsmov edi, 0;Offset 0.mov ecx, 25*80;Load count.mov eax, 0720H;Load value to write.rep stoswmovsb;es:[edi]=ds:[esi]; edi+/-=1; esi+/-=1movsd;es:[edi]=ds:[esi]; edi+/-=4; esi+/-=4 Systems Design & Programming 80x86 Assembly III CMPE 31010 (Mar. 1, 2002)UMBCU M B CUNIVERSITY OF MARYLAND BALTIMORE COUNTY1 9 6 6String Operationsinsw W1, W2;es:[edi]=[edx]; edi+/-=2; esi+/-=2insb;es:[edi]=[edx]; edi+/-=1insd;es:[edi]=[edx]; edi+/-=4outsb;[edx]=ds:[esi]; esi=esi+/-1xchg edx, esi;Exchange edx and esi [...]... rightmost two bits ;Speaker off ;8-bits are saved to al from I/O port p8 ;32-bits are written to port dx from eax in al, 61H or al, 3 out 61H, al mov cx, 1000H loop L1 in al, 61H and al, 0FCH out 61H, al in al, p8 out dx, eax Systems Design & Programming 80x86 Assembly III MO UN TI RE COUNT Y IVERSITY O F M YLAND BA L 1966 U M B C AR 2 2 3 3 bswap eax 3 3 2 2 1 1 0 0 ;Sign-extends bl into cx ;Zero extends . W2;es:[edi]=[edx]; edi+ /-= 2; esi+ /-= 2insb;es:[edi]=[edx]; edi+ /-= 1insd;es:[edi]=[edx]; edi+ /-= 4outsb;[edx]=ds:[esi]; esi=esi+ /-1 xchg edx, esi;Exchange. value to write.rep stoswmovsb;es:[edi]=ds:[esi]; edi+ /-= 1; esi+ /-= 1movsd;es:[edi]=ds:[esi]; edi+ /-= 4; esi+ /-= 4 Systems Design & Programming 80x86 Assembly