Thiết kế và lập trình hệ thống - Chương 22

... BALTIMORE COUNTY1 9 6 6Arithmetic Operationssub eax, ebxdec edi;Subs registers - Carry flag.sbb ecx, ebx;eax=eax-ebxcmp al, 10Hjae LABEL1;Jump if equal or below.jbe LABEL2;if ecx==eax, eax=edx ... Resultxor ah, ch ;ah=ah XOR chtest al, 4jz LABEL;Jump to LABEL if bit 2 is zero.;Tests bit 2 in al -- 00000100not ebxneg TEMPSystems Design & Programming 80x86 Assembly IV CMPE 3107 (Mar. 1, ... IV CMPE 31010 (Mar. 1, 2002)UMBCU M B CUNIVERSITY OF MARYLAND BALTIMORE COUNTY1 9 6 6Flow-of-Control Instructionsja ;Jump if above (Z=0 and C=0);Jump if below or equal (Z=1 or...

... page table entry addresses a 4KB section of main mem.• Offset: Specifies the byte in the page.11 1221 2231DirectoryPage TableOffset31 12Physical Address0Linear or Virtual AddressPage Directory or ... 2002)UMBCU M B CUNIVERSITY OF MARYLAND BALTIMORE COUNTY1 9 6 6Memory AddressingMemory Paging:11 1221 2231[00]0C[00]10 0x08A0Virtual Address:CR300010 ++0x000100300x050010x050000000x050010000x050010400x000200000x000210000x000300000x00030+0x0003008A[binary]hex0x0301008A=0x030*4*4=0x040Systems ... the 80386 and up.Allows a linear address (virtual address) of a program to be located in any por-tion of physical memory.The paging unit is controlled by the microprocessors control registers:311211...

... 8):A7VCC2K x 8 EPROM123456789201918171615141310271611 1221 2223 24A6A5A4A3A2A1A0GNDO0O1O2A8A9VPPCSA10PD/PGMO7O6O5O4O3Pin(s)FunctionA0-A10PD/PGMCSO0-O7AddressPower down/ProgramChip SelectOutputsChip ... 10ns.A7VCC2K x 8 SRAM123456789201918171615141310TMS401611 1221 2223 24A6A5A4A3A2A1A0GNDDQ1DQ2DQ3A8A9WGA10SDQ8DQ7DQ6DQ5DQ4Pin(s)FunctionA0-A10DQ0-DQ7G (OE)S (CS)AddressData In/Data OutRead EnableChip ... 64-bit wide data bus.The 30-pin and 72-pin SIMMs are not used on these systems.Rather, 64-bit DIMMs (Dual In-line Memory Modules) are the standard.These organize the memory 64-bits wide.The board has...

... )X16G X( )-- -- - -- - -- - -- - -- - -- - -- - -X27X26X25X24X22X21X18+ + + + + +X16X15X21+ + +-- -- - -- - -- - -- - -- - -- - -- - -- - -- - -- - -- - -- - -- - -- - -- - -- - -- - -- - -- - -- - -- - -- - -- - -- - -- - -- - -- - -- - -- - -- - -- - -- - -- - -- - -- - =X16X15X21+ ... 15.Therefore, no more than 2 bytes are needed independent of the data block size.CRCM X( )XnG X( )-- -- - -- - -- - -- - -- - -- - Q X( ) R X( )+= =Q(X) is the quotientR(X) is the remainderG X( ) X16X15X21+ + +=Systems ... ...CS2764A16A17A18A19A13A14A15CSCSCSCSCSCSCSRD of 8088/86Data BusAddress BusF2000-F3FFFF0000-F1FFFF4000-F5FFFF6000-F7FFFF8000-F9FFFFA000-FBFFFFC000-FDFFFFE000-FFFFFAddress spaceF0000H-FFFFFHA13 through A15 selecta 2764A16 through...

... InterfaceI1I2I3I4I5I6I7I8I9I1016L8O1O2O3O4O5O6O7O8A29A30A31I1I2I3I4I5I6I7I8I9I1016L8O1O2O3O4O5O6O7O8A19A20A21A22A23A24A25A26A27A28A0A15O0O7......CEOE27512D0-D7D8-D15D15-D23D24-D31D56-D63D48-D55D40-D47D32-D39A3-A18MRDCA0A15O0O7......CEOE27512A0A15O0O7......CEOE27512A0A15O0O7......CEOE27512A0A15O0O7......CEOE27512A0A15O0O7......CEOE27512A0A15O0O7......CEOE27512A0A15O0O7......CEOE27512(64K ... pin on RAS)A8S1S0MUX256-to-1MUX256-to-1MUX256-to-1MUX256-to-164K array(256 X 256)2552541064K array(256 X 256)64K array(256 X 256)64K array(256 X 256)256K X 1 DRAMA0-A7A10-A17Block 0Block 1Block ... and selected simultaneously:S0S1S2SN-2SN-1Storage cellInput-Output(M bits)AKAK+1AK+2AL-1Column address =A0AK-1Bit lineWord lineA0 to AK-1Row address =AK to AL-1A column decoder is added toselect...

... lowest-num-bered memory location.floatstr db ’Float number -& gt; %f ’, 10, 0main1_str: db ’ Rectangular Areas’, 10, 0temp_buf: times 200 db 0temp_buf_size: equ $-temp_bufneg_exponent: dd -1 00301H302H303H12H34HLow-order ... (February 3, 2000 1 :22 am)UMBCU M B CUNIVERSITY OF MARYLAND BALTIMORE COUNTY1 9 6 6Assembly DirectivesASCII: Stored using an assembler directive db:Word-sized (dw) and doubleword-sized data (dd):Little ... $-temp_bufneg_exponent: dd -1 00301H302H303H12H34HLow-order byteHigh-order byteStorage of the number 1234Systems Programming 80x86 Assembly Basics CMPE 3104 (February 3, 2000 1 :22 am)UMBCU M B CUNIVERSITY OF...

... dlaxbxcxdxspbpdisiAccumulatorBase IndexCountDataStack PointerBase PointerDestination IndexSource Index16-bitregisters32-bitextensionsah alax8-bit16-bitnamesSystems Design & Programming 80x86 Assembly I CMPE 3103 (Feb ... MARYLAND BALTIMORE COUNTY1 9 6 6Data Addressing Modes Base relative-plus-indexA second variation includes: mov eax, [ebx+edi+4] Scaled-indexA second variation includes: mov eax, ebx*2+ecx+offsetScaling ... Addressing Modes• Register IndirectAny of eax, ebx, ecx, edx, ebp, edi or esi may be used.• Base-plus-indexAny combination of eax, ebx, ecx, edx, ebp, edi or esi.• Register relativeA second variation...

... constant is any 32-bit signed value.Base Relative-Plus-Index addressing:Effective address computed as:seg_base + base + index + constant.Designed to be used as a mechanism to address a two-dimensional ... Addressing ModesBase-Plus-Index addressing:Effective address computed as:seg_base + base + index.Base registers: Holds starting location of an array.• ebp (stack)• ebx (data)• Any 32-bit register except ... Addressing ModesScaled-Index addressing:Effective address computed as:seg_base + base + constant*index.Code Memory-Addressing Modes:Used in jmp and call instructions.Three forms: Direct PC-Relative IndirectDirect:Absolute...

... 6✬✎✭✮✠✯✰✱✲✲✯✳✴✰✎✵MiscellaneousDataTransferOperations.INandOUT:Transfersabyte,wordordoublewordofdatafrom/toanI/Odeviceinto/outofAL,AXandEAX,respectively.Memoryoperationsarenotavailable(astheyareinINSandOUTS):Twoforms:•Fixed-portaddressing:8-bitportnumberencodedininstruction.8-bitvalueissign-extendedintoaddressbits 8-1 5.Addressbits1 6-3 1areundefined.•Variable-portaddressing:16-bitportnumberstoredinDX. ✁AL✄✠✝☎✝ ... 6✬✎✭✮✠✯✰✱✲✲✯✳✴✰✎✵MiscellaneousDataTransferOperations.MOVSXandMOVZX(80386anduponly):Move-and-sign-extendandMove-and-zero-extend:BSWAP(80486anduponly):Swapsthefirstbytewiththeforth,andthesecondbytewiththethird.Usedtoconvertbetweenlittleendianandbigendian: ✛✁✄ CX✄BL☎✟✒✏☛✎✙☎✡✙☛✛✎✆✕✒☛✡✍✢✝ ✛✁✂ EAX✄ ✁✂✁✢☎✄✙✚✍✙☎✡✙☛✛✎✟✍✚✛✔✡ ✁✂✁✢✒☛✆✆☎✜✂✄✜✟✙EAXEAXEBXECXEDX✡✡✠✠✞✞✝✝✝✝✞✞✠✠✡✡ ✂✁✄☎ ... 6✬✎✭✮✠✯✰✱✲✲✯✳✴✰✎✵MiscellaneousDataTransferOperations.XCHG:Exchangesthecontentsofaregisterwiththecontentsofanyotherregisterormemorylocation.ItcanNOTexchangesegmentregistersormemory-to-memorydata.Byte,wordanddoublewordscanbeexchangedusinganyaddressingmode(exceptimmediate,ofcourse).XLAT:PerformsatablelookupoperationbyconvertingthevalueinALfromanindextoavaluestoredinthecellofatableinmemory. ✁✂✄EDX✄ESI☎✆✆☎✠✖✔☛✏✙✆ ✝✔☛✛✆✟☛ ✁✂✄AL✄ ✁✂✁✢☎✆☎✠✖✔☛✏✙✚✙✏✒✎✡✙✚✔☛✛✌✙✌✍✚ ✗✔✟✓✙✎✜MOV...

... CUNIVERSITY OF MARYLAND BALTIMORE COUNTY1 9 6 6✪✎✫✬✠✭✮✯✰✰✭✱✲✮✎✳Addition,Increment,Add-with-carryandExchange-and-add(80486):Contentsoftherightmost8bitsoftheFLAGSregistercanchange(+Overflow)forarithmeticandlogicinstructions.Flagsinclude:•Z(resultzero?)•C(carryout?)•A(halfcarryout?)•S(resultpositive?)•P(resulthasevenparity?)•O(overflowoccurred?) ✁✁AL✂✄☎✆✆☎✝✞✟✠✡☛☎☞☞✍✌✎✏✍✑✒✓✔✕✖✗✘✚✙✖✙✖✛✜✖✢✏✌✖✗✣✤✥✦✝✧★✩✧✆✄EDI]☛☎☞☞✍✌✕✖✗✪✌✏✖✕✌✞✫✒✕✕✔✬✭✒✗✯✮ ✁✥ECX✂EBX☛★✫✰✱★✫✰✞★✦✰✂★✦✰✱✑✕✪✗✪✓✒✭★✫✰✮✲ ✁✁ECX✂EBX☛✳✌✖☞✬✑✕✒☞☞✪✓✗✴ ... 6✪✎✫✬✠✭✮✯✰✰✭✱✲✮✎✳Subtraction,DecrementandSubtract-with-borrow:Comparison:Changesonlytheflagbits.Oftenfollowedwithaconditionalbranch: ✁✂EAX✂EBX✁✄✥EDI☛✟✷✶✌✕✖✗✪✌✏✖✕✌☎✫✒✕✕✔✬✭✒✗✯✮ ✂✂ECX✂EBX;EAX=EAX-EBX✥✆✝AL✂✎✞✟✠ ✄LABEL1☛✡✷✙✢✪✬✖☛✷✒✭✑✕✶✍✖✭✑☞✮✠✂✄LABEL2☛✪✬✫✰✱✱☎✰✂☎✰✱✌✰✖✭✌✖☎✰✱✫✰✥✆✝✲✥✍✎CX✂DX☛✡✷✙✢✪✬✖☛✷✒✭✑✕✒✶✑✏✖✮ ✂✁✄☎ ... 6✪✎✫✬✠✭✮✯✰✰✭✱✲✮✎✳MultiplicationandDivision:IMUL/IDIV:Signedintegermultiplication/division.MUL/DIV:Unsigned.ALalwaysholdsthemultiplicand(orAXorEAX).ResultisplacedinAX(orDXandAXorEDXorEAX).CandObitsareclearedifmostsignificant8bitsofthe16-bitproductarezero(resultofan8-bitmultiplicationisan8-bitresult).Divisionbyzeroandoverflowgenerateerrors.Overflowoccurswhenasmallnumberdividesalargedividend.✆✁ BL✣✆✁ BX☛✟✢✖✜✪✒✭✂✫✰✱✌✰✁✎✂✟✄✌✪✗✓✖☞✑✓✭✔☎✣✆✁ CX✂✆✝✞✟✠✡;EDX|EAX=EAX*ECX✆✁ ECX☛☎✰✱☎☛✁✦☛✄✷✓✌✪✗✓✖☞☎☛✌✰☞☎✰✱☎✰✁✦✰✄✌✪✗✓✖☞☎✁✣✌CL;DX|AX=(DX|AX)/CX✣✁✣✌CX☛☎✟☞☎☛✱☎✰✘✫☛✂✷✓✌✪✗✓✖☞☛✷✑✏✪✖✓✏☛✪✓☎☛✂✕✖✙✒✪✓☞✖✕✪✓☎✟ ✂✁✄☎...