Assembly Language: 2 Registers - X86 (32 BIT) Arch
Processor operations mostly involve processing data. This data can be stored in memory and accessed from thereon. However, reading data from and storing data into memory slows down the processor, as it involves complicated processes of sending the data request across the control bus and into the memory storage unit and getting the data through the same channel.
To speed up the processor operations, the processor includes some internal memory storage locations, called registers.
The registers store data elements for processing without having to access the memory. A limited number of registers are built into the processor chip.
Processor Registers
There are ten 32-bit and six 16-bit processor registers in IA-32 architecture. The registers are grouped into three categories −
General registers,
Control registers, and
Segment registers.
The general registers are further divided into the following groups −
Data registers,
Pointer registers, and
Index registers.
Data Registers
Four 32-bit data registers are used for arithmetic, logical, and other operations. These 32-bit registers can be used in three ways −
As complete 32-bit data registers: EAX, EBX, ECX, EDX.
Lower halves of the 32-bit registers can be used as four 16-bit data registers: AX, BX, CX and DX.
Lower and higher halves of the above-mentioned four 16-bit registers can be used as eight 8-bit data registers: AH, AL, BH, BL, CH, CL, DH, and DL.
I hope you enjoy this tutorial, stay tunned for next Assembly tutorial where we are going to discuss system Calls.
Timestamp:
Introduction to CPU: 00:00
Writing the program: 06:08
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