POPA in Visual Studio .NET

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POPA
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PUSHA pushes all 16-bit general-purpose registers onto the stack This instruction is present on the 286 and later CPUs and is not available in the 8086/8088 The 16-bit general-purpose registers are popped in this order: DI, SI, BP, SP, BX, DX, CX, AX There's one wrinkle here: The SP value popped off the stack is not popped back into SP! (That would be insane, since we're using SP to manage the stack as we pop values off of it) The value in SP's position on the stack is simply discarded when instruction execution reaches it POPA is usually used in conjunction with PUSHA, but nothing guarantees this If you pop garbage values off the stack into the general registers, well, interesting things (in the sense of the old Chinese curse) can and probably will happen 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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POPF Pop Top of Stack into Flags Flags affected:
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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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POPF <none>
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POPF pops the 16-bit word at the top of the stack into the Flags register 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 incremented by two after the word comes off 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 PUSHF and POPF are most used in writing 16-bit 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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POPFD Pop Top of Stack into EFlags (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 * * * * * * * * * 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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POPFD <none>
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POPFD pops the double word (4 bytes) at the top of the stack into the EFlags register In 32-bit protected mode, the top of the stack is defined as the DWORD at [ESP], and there is no way to override the SS segment with prefixes ESP is incremented by 4 after the word comes off 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, in both 16-bit and 32-bit sizes PUSHFD and POPFD are most used in writing 32-bit 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
PUSH Push Operand onto Top of Stack Flags affected:
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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