IRET in Visual Studio .NET

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IRET
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IRET must be used to exit from interrupt service routines called through INT or through interrupt hardware such as serial ports and the like IRET pops the return address from the top of the stack into CS and IP, and then pops the next word from the stack into the Flags register All flags are affected If the interrupt was triggered by hardware, there may be additional steps to be taken to prepare the hardware for another interrupt before IRET is executed Consult your hardware documentation When using NASM, the actual opcode generated for IRET depends on the setting of the BITS setting, and governs whether a 16-bit return or 32-bit return is generated r8 = AL AH BL BH CL CH DL DH sr = CS DS SS ES FS GS m8 = 8-bit memory data m32 = 32-bit memory data i16 = 16-bit immediate data d8 = 8-bit signed displacement d32 = 32-bit unsigned displacement r16 = AX BX CX DX BP SP SI DI r32 = EAX EBX ECX EDX EBP ESP ESI EDI m16 = 16-bit memory data i8 = 8-bit immediate data i32 = 32-bit immediate data d16 = 16-bit signed displacement
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J Jump on Condition Flags affected:
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O D I T S Z A P C F F F F F F F F F <none> OF: Overflow flag TF: Trap flag AF: Aux carry DF: Direction flag SF: Sign flag PF: Parity flag IF: Interrupt flag ZF: Zero flag CF: Carry flag
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JA/JNBE JAE/JNB JB/JNAE JBE/JNA JE/JZ JNE/JNZ JG/JNLE JGE/JNL JL/JNGE JLE/JNG JC JNC JO JNO JP/JPE JNP/JPO JS JNS d d d d d d d d d d d d d d d d d d Descriptions (Jump If Above/Jump If Not Below or Equal) (Jump If Above or Equal/Jump If Not Below) (Jump If Below/Jump If Not Above or Equal) (Jump If Below or Equal/Jump If Not Above) (Jump If Equal/Jump If Zero) (Jump If Not Equal/Jump If Not Zero) (Jump If Greater/Jump If Not Less or Equal) (Jump If Greater or Equal/Jump If Not Less) (Jump If Less/Jump If Not Greater or Equal) (Jump If Less or Equal/Jump If Not Greater) (Jump If Carry flag set) (Jump If Carry flag Not set) (Jump If Overflow flag set) (Jump If Overflow flag Not set) (Jump If PF set/Jump if Parity Even) (Jump If PF Not set/Jump if Parity Odd) (Jump If Sign flag set) (Jump If Sign flag Not set) Jump if flags are CF=0 AND ZF=0 CF=0 CF=1 CF=1 OR ZF=1 ZF=1 ZF=0 ZF=0 OR SF=OF SF=OF SFOF ZF=1 OR SFOF CF=1 CF=0 OF=1 OF=0 PF=1 PF=0 SF=1 SF=0
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d without NEAR = 8-bit signed displacement; use NEAR before d to specify segment-wide displacement
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JB HalfSplit JLE TooLow JG NEAR WayOut ;Jumps if CF=1 ;Jumps if either ZF=1 or SFOF ;Jumps if greater to 16-bit displacement ; in real mode or 32-bit displacement in ; 32-bit protected mode
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By default all these instructions make a short jump (127 bytes forward or 128 bytes back) if some condition is true, or fall through if the condition is not true The conditions all involve flags, and the flag conditions in question are given to the right of the mnemonic and its description The mnemonics incorporating "above" or "below" are for use after unsigned comparisons, whereas the mnemonics incorporating "less" or "greater" are for use after signed comparisons "Equal" and "Zero" may be used after unsigned or signed comparisons NASM allows use of the segmentwide form by inserting the NEAR keyword after the instruction mnemonic In real mode this allows the use of a 16-bit signed displacement, and in 32-bit protected mode this allows the use of a 32-bit signed displacement Use of NEAR is only supported with 386 and newer CPUs r8 = AL AH BL BH CL CH DL DH sr = CS DS SS ES FS GS r16 = AX BX CX DX BP SP SI DI r32 = EAX EBX ECX EDX EBP ESP ESI EDI
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m8 = 8-bit memory data m32 = 32-bit memory data i16 = 16-bit immediate data d8 = 8-bit signed displacement d32 = 32-bit unsigned displacement
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m16 = 16-bit memory data i8 = 8-bit immediate data i32 = 32-bit immediate data d16 = 16-bit signed displacement
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JCXZ Jump If CX = 0 Flags affected:
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O D I T S Z A P C F F F F F F F F F <none> OF: Overflow flag TF: Trap flag AF: Aux carry DF: Direction flag SF: Sign flag PF: Parity flag IF: Interrupt flag ZF: Zero flag CF: Carry flag
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