What is register EAX?
eax. eax is a 32-bit general-purpose register with two common uses: to store the return value of a function and as a special register for certain calculations. It is technically a volatile register, since the value isn’t preserved. Instead, its value is set to the return value of a function before a function returns.
What are the 6 general purpose registers?
The 8085 has six general – purpose registers to store 8-bit data; these are identified as B, C, D, E, H and L as shown in the figure. They can be combined as register pairs – BC, DE, and HL – to perform some 16-bit operations.
What is BL register?
bl is the name of the low 8 bits (bits 7-0) in the ebx register. There is also bh which is the bits 15-8 of ebx , and bx is the low 16 bits (bits 15-0). There is no name for the higher 16 bits. This applies to all of the registers eax , ebx , ecx and edx .
How long is EAX register?
32-bit
eax is the 32-bit, “int” size register. It was added in 1985 during the transition to 32-bit processors with the 80386 CPU.
What is the function of EAX register in CPU?
EAX,AX,AH,AL : Called the Accumulator register. It is used for I/O port access, arithmetic, interrupt calls, etc…
What is the RCX register?
rcx – register c extended. rdx – register d extended. rbp – register base pointer (start of stack) rsp – register stack pointer (current location in stack, growing downwards) rsi – register source index (source for data copies)
What are registers in 8085?
General-Purpose Registers: The 8085 microprocessor contains six 8-bit general purpose registers. They are: B, D, C, E, H and L register. To hold data of 16-bit a combination of two 8-bit registers can be employed. The combination of two 8-bit registers is called register pair.
What is segment register?
Segment Registers Segments are specific areas defined in a program for containing data, code and stack. There are three main segments − Code Segment − It contains all the instructions to be executed. A 16-bit Code Segment register or CS register stores the starting address of the code segment.
What is EIP register?
The EIP register (prior to transferring program control) contains the address of the instruction following the CALL instruction. When this address is pushed on the stack, it is referred to as the return instruction pointer or return address.
What is x86 Al?
al and ah are the 8-bit, “char” size registers. al is the low 8 bits, ah is the high 8 bits. They’re pretty similar to the old 8-bit registers of the 8008 back in 1972.