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Examples. The. pushf. instruction at offset. 0x401426. has pushed the value. 0x206. to the stack, which corresponds to. 0000001000000110. in binary: +------+----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+----+ | bit | 15 | 14 | 13 | 12 | 11 | 10 | 09 | 08 | 07 | 06 | 05 | 04 | 03 | 02 | 01
up: Chapter 17 -- 80386 Instruction Set prev: PUSHA/PUSHAD Push all General Registers next: RCL/RCR/ROL/ROR Rotate. PUSHF/PUSHFD -- Push Flags Register onto the Stack. Opcode Instruction Clocks Description 9C PUSHF 4 Push FLAGS 9C PUSHFD 4 Push EFLAGS. Operation. IF OperandSize = 32 THEN
Examples: PUSHF. Notes: 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 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 Flag Register Onto Stack ( pushf ). pushf{wl}. Operation. flags register -> stack. Description. For a word, SP - 2 and copies FLAGS to the new top of stack pointed to by SP. For a long, SP - 4 and copies EFLAGS to the new top of stack pointed to by SS:eSP. Example. Pushes the flags register onto the top of the stack:
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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 to point to the new stack top. CS is not a valid destination. Clocks. operands, 286, 386, 486, Size Bytes. reg16, 5, 4, 4, 1. reg32, 4, 1. segreg, 5, 7, 3, 1. mem16, 5, 5
The 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. Some assemblers may force the operand size to 16 when PUSHF is
PUSHF/PUSHFD -- Push Flags Register onto the Stack. Opcode, Instruction, Clocks, Description, Example PUSHF decrements the stack pointer by 2 and copies the FLAGS register to the new top of stack; PUSHFD decrements the stack pointer by 4, and the 80386 EFLAGS register is copied to the new top of stack which
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