What is Pushf?
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. The Flags register is not affected when you push the flags, but only when you pop them back with POPF.
What is Pushf in assembly language?
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 used and to 32 when PUSHFD is used.
What is a flag in microprocessor?
The FLAGS register is the status register that contains the current state of the CPU. The size and meanings of the flag bits are architecture dependent. The carry, parity, adjust, zero and sign flags are inherited from an earlier architecture, 8080 and 8085.
What is flag and its types?
There are total 9 flags in 8086 and the flag register is divided into two types: (a) Status Flags – There are 6 flag registers in 8086 microprocessor which become set(1) or reset(0) depending upon condition after either 8-bit or 16-bit operation.
What is the use of push in 8086?
PUSH then places the operand on the new top of stack, which is pointed to by the stack pointer. The 80386 PUSH eSP instruction pushes the value of eSP as it existed before the instruction. This differs from the 8086, where PUSH SP pushes the new value (decremented by 2).
What is the content of stack pointer?
A stack pointer is a small register that stores the address of the last program request in a stack. A stack is a specialized buffer which stores data from the top down. As new requests come in, they “push down” the older ones.
Which of the following is a 16 bit register?
Stack Pointer: The stack pointer in the 8085 microprocessor is a 16-bit register that stores the address of the top of stack memory.
What is difference between carry and auxiliary carry flag?
The auxiliary carry flag AF watches for a 4-bit (nibble) carry, while the common carry flag CF watches for a carry-out from the MSB of the operand size.
What are the type of flags?
Flags of various forms and purpose are known as colours, standards, banners, ensigns, pendants (or pennants), pennons, guidons, and burgees. The parts of a flag.
What are the two types of flags?
The Different Types Of Flags
- National Flags – Individuals and businesses alike fly these to show pride in their country, or to signify their country of origin.
- Provincial Flags-Each province has it’s own special flag these flags are usually flown at government offices.
What is the Z flag?
International maritime signal flag In the system of international maritime signal flags, part of the International Code of Signals, the Z flag stands for the letter Z (“Zulu” in the NATO Alphabet) when used in letter-by-letter alphabetic communication.
Why stack is used in 8086?
In 8086, the main stack register is called stack pointer – SP. The stack segment register (SS) is usually used to store information about the memory segment that stores the call stack of currently executed program. By default, the stack grows downward in memory, so newer values are placed at lower memory addresses.
