PUSHF <none> in .NET

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PUSHF <none>
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PUSHF simply pushes the current contents of the Flags register onto the top of the stack The top of the stack is defined as the word at SS:SP, and there is no way to override that with prefixes SP is decremented before the word goes onto the stack Remember that SP always points to either an empty stack or else real data There is a separate pair of instructions, PUSH and POP, for pushing and popping other register data and memory data The Flags register is not affected when you push the flags, but only when you pop them back with POPF PUSHF and POPF are most used in writing interrupt service routines, where you must be able to save and restore the environment, that is, all machine registers, to avoid disrupting machine operations while servicing the interrupt 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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PUSHFD Push 32-Bit EFlags onto Stack (386+) 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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PUSHFD <none> 386+
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PUSHFD simply pushes the current contents of the 32-bit EFlags register onto the top of the stack The top of the stack in 32-bit modes is defined as the word at [SS:ESP], and there is no way to override that with prefixes ESP is decremented before the EFlags double word goes onto the stack Remember that ESP always points to either an empty stack or else real data There is a separate pair of instructions, PUSH and POP, for pushing and popping other register data and memory data, and (in the 286 and later processors) immediate data The EFlags register is not affected when you push the flags, but only when you pop them back with POPFD PUSHFD and POPFD are most used in writing interrupt service routines, where you must be able to save and restore the environment, that is, all machine registers, to avoid disrupting machine operations while servicing the interrupt 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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RET Return from Procedure 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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RET RETN RETF RET i8 RETN i8 RET i16 RETF i16
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There are two kinds of returns: Near and Far, where Near is within the current code segment and Far is to some other code segment Ordinarily, the RET form is used, and the assembler resolves it to a Near or Far return opcode to match the procedure definition's use of the NEAR or FAR specifier Specifying RETF or RETN may be done when necessary RET may take an operand indicating how many bytes of stack space are to be released on returning from the procedure This figure is subtracted from the stack pointer to erase data items that had been pushed onto the stack for the procedure's use immediately prior to the procedure call The RETF and RETN forms are not available in Microsoft's MASM prior to V50! 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
ROL Rotate Left Flags affected:
O D I T S Z A P C F F F F F F F F F * * 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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ROL ROL ROL ROL ROL ROL ROL ROL ROL ROL ROL ROL ROL ROL ROL ROL ROL ROL r8,1 m8,1 r16,1 m16,1 r32,1 m32,1 r8,CL m8,CL r16,CL m16,CL r32,CL m32,CL r8,i8 m8,i8 r16,i8 m16,i8 r32,i8 m32,i8