Pushf instruction in 8086 architecture #556#

Pushf instruction in 8086 architecture #556#

Documentation Home > IA-32 Assembly Language Reference Manual > Chapter 2 Instruction-Set Mapping > Flag Instructions > Push Flag Register Onto Stack

 

 

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up: Chapter 17 -- 80386 Instruction Set PUSHF/PUSHFD -- Push Flags Register onto the Stack. Opcode Instruction Clocks Description 9C PUSHF 4 Push FLAGS 9C PUSHFD 4 Push EFLAGS Virtual 8086 Mode Exceptions. #GP(0) fault if POP - Pop Word off Stack. Usage: POP dest. Modifies Flags: None. Transfers word at the current stack top (SS:SP) to the destination then increments SP by two When in virtual-8086 mode and the I/O privilege level (IOPL) is less than 3, the PUSHF/PUSHFD instruction causes a general protection exception (#GP). In the real-address mode, if the ESP or SP register is 1, 3, or 5 when the PUSHA/PUSHAD instruction is executed, the processor shuts down due to a lack of stack space. When in virtual-8086 mode and the I/O privilege level (IOPL) is less than 3, the PUSHF/PUSHFD instruction causes a general protection exception (#GP). In the real-address mode, if the ESP or SP register is 1, 3, or 5 when the PUSHA/PUSHAD instruction is executed, the processor shuts down due to a lack of stack space. Assuming you're talking about the Intel x86 instruction set, PUSHF pushes the entire set of flags, the entire contents of the 16-bit FLAGS register, onto the stack. 28 Nov 2015 X86-assembly/Instructions/pushf. From aldeid. Jump to navigation Jump to search. You are here: X86-assembly · Instructions The pushf instruction at offset 0x401426 has pushed the value Architecture/x86-assembly The 8086 processor has stack instructions; Procedure calls use the stack for return PUSHF. Pushes the FLAGS register onto the stack. A PUSH instruction Clever (some would say incomprehensible) misuse of x86 features could do . This instruction set extension was first supported in BroadwellThe PUSHF (push flags) and PUSHFD (push flags double) mnemonics reference the same opcode. The PUSHF instruction is intended for use when the operand-size attribute is 16 and the PUSHFD instruction for when the operand-size attribute is 32.

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