CS320 x86 Instruction Summary Sheet

Version 1.2


x86 Flags Register:
Bit:  15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
                  OF DF IF TF SF ZF    AF    PF    CF



 x86 Instruction Set


    

  1.  MOV <destination>,<source> 

  2.  MOVZX <destination>,<source>

  3.  MOVSX <destination>,<source>

  4.  LAHF ; load the low byte of EFLAGS into AH

  5.  SAHF ; store the value of AH into low byte of EFLAGS

  6.  XCHG <destination>,<source>

  7.  INC <destination>

  8.  DEC <destination>

  9.  ADD <destination>,<source>

  10.  SUB <destination>,<source>

  11.  LOOP <short-label>

  12.  NEG <destination>

  13.  JMP <target>

  14.  PUSH <source> [<comment>]

  15.  POP <destination> [<comment>]

  16.  PUSHA  [<comment>]

  17.  POPA  [<comment>]

  18.  PUSHAD  [<comment>]

  19.  POPAD  [<comment>]

  20.  PUSHF  

  21.  POPF

  22.  CALL <target>

  23.  RET [<popvalue>]

  24.  AND <destination>,<source>

  25.  OR <destination>,<source>

  26.  XOR <destination>,<source>

  27.  NOT <destination>

  28.  TEST <destination>,<source>
    
<op-code> <short-label>

  29.  JA/JNBE  (unsigned) 

  30.  JAE/JNB

  31.  JB/JNAE

  32.  JBE/JNA

  33.  JE/JZ

  34.  JNE/JNZ

  35.  JG/JNLE (signed)

  36.  JGE/JNL

  37.  JL/JNGE

  38.  JLE/JNG

  39.  JC      (flags register)

  40.  JNC    

  41.  JO     

  42.  JNO

  43.  JS     

  44.  JNS    

  45.  JP/JPE 

  46.  JNP/JPO

  47.  CMP <destination>,<source>

  48.  LOOPE <short-label>
 LOOPZ <short-label>

  49.  LOOPNE <short-label>
 LOOPNZ <short-label>

  50.  MUL <destination> (unsigned)

  51.  IMUL <destination> (signed)

  52.  DIV <destination> (unsigned) AX-quotient, DX-remainder

  53.  IDIV <destination> (signed)
    

  54.  SAR <destination>,<shiftcount> - Arithmetic right-shift (signed)

  55.  SAL <destination>,<shiftcount>- Arithmetic left-shift (signed)

  56.  SHR <destination>,<shiftcount>- Logical right-shift (unsigned)

  57.  SHL <destination>,<shiftcount>- Logical left-shift (unsigned)

  58.  ROR <destination>,<shiftcount>- right rotate

  59.  ROL <destination>,<shiftcount>- left rotate

  60.  RCR <destination>,<shiftcount>- right rotate-through carry

  61.  RCL <destination>,<shiftcount>- left rotate-through carry

  62.  CALL <target>

  63.  RET

  64.  CLD       ; increment

  65.  STD       ; decrement

  66.  MOVSB     ; ds:si -> es:di

  67.  MOVSW     ; ds:si -> es:di

  68.  LODSB     ; al <- ds:si

  69.  LODSW     ; ax <- ds:si

  70.  STOSB     ; al -> es:di

  71.  STOSW     ; ax -> es:di

  72.  CMPSB     ; ds:si - es:di

  73.  CMPSW     ; ds:si - es:di

  74.  SCASB     ; al - es:di

  75.  SCASW     ; ax - es:di

  76.  REP <string-op>

  77.  REPE <string-op>
 REPZ <string-op>

  78.  REPNE <string-op>
 REPNZ <string-op>

  79.  IRET

  80.  INT <int-type>






Library Routines

Clrscr      - clears console
Crlf        - outputs carriage return / line feed
Delay       - set eax to the number of milliseconds to delay
DumpRegs    - dumps the registers to the screen
GetMseconds - number of milliseconds elapsing 
              since midnight in eax
Gotoxy      - dh = row (0 - 24)
              dl = column (0 - 79)
Random32    - 32-bit pseudorandom integer in eax
Randomize   - sets the random seed based on the 
              time of day
RandomRange - produces random number between 0
              to (n - 1) where n is eax
ReadChar    - returns character in al
ReadHex     - returns up to 8 HEX digits in eax
ReadInt     - returns 32-bit signed int in eax
ReadString  - edx points to the beginning of the string
              ecx is the maximum number of characters
                  that can be input
              eax is the number of characters actually read
WaitMsg     - outputs Press [Enter] to continue...
              and waits for the user to hit return
WriteBin    - ouputs the value in eax in binary form
WriteChar   - outputs character represented in al register
WriteDec    - outputs 32-bit unsigned integer in eax in
              decimal with no leading zeros
WriteHex    - outputs 32-bit unsigned integer in eax in
              hex with leading zeros added if necessary to
              make 8 hex digits
WriteInt    - outputs 32-bit signed integer in eax with a 
              leading sign and no leading zeros
WriteString - point edx to beginning of null terminated 
              string
Note1: I do not show the flags for the jump instructions. You should know when to use what jump and if I have a test question involving the flags registers, I'll tell you what the flags are.