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What is segment register in assembly language?

What is segment register in assembly language?

The segment registers stores the starting addresses of a segment. To get the exact location of data or instruction within a segment, an offset value (or displacement) is required.

What is data segment register?

Data segment register (DS): points to the data segment of the memory where the data is stored. Extra Segment Register (ES): also refers to a segment in the memory which is another data segment in the memory. The stack segment is that segment of memory which is used to store stack data.

How does segmentation work in x86?

x86 memory segmentation refers to the implementation of memory segmentation in the Intel x86 computer instruction set architecture. Segmentation was introduced on the Intel 8086 in 1978 as a way to allow programs to address more than 64 KB (65,536 bytes) of memory. Instructions are always fetched from the code segment.

Which segment register is used with Di?

extra segment register
ES is called extra segment register. It is usually used with DI and doing pointers things.

What are the extra registers in assembly programming?

Apart from the DS, CS and SS registers, there are other extra segment registers – ES (extra segment), FS and GS, which provide additional segments for storing data. In assembly programming, a program needs to access the memory locations. All memory locations within a segment are relative to the starting address of the segment.

What are the four registers in the x86 assembly?

Now we gonna explain these registers step by step: Four sets of registers contain in the x86 assembly are for general data manipulation. However, a processor can operate on data stored in memory, but processor can perform data manipulation at the much faster rate when data is in registers.

How to store data in segments with Assembly Stack Overflow?

For example, the CS register points to the Code Segment. The Code Segment contains the program’s code. If I used the CS register with an offset to store some data, how would I know where to put my data so as not to overwrite the code that it is storing? Please let me know. I using Intel syntax assembly and assembling with NASM.

Why do you have data segments in x86?

That’s why you have a Data Segment (base pointed to by DS) or even an “extra” data segment (-> ES). Obvisouly, since your basic assumption must be that whatever is in the code segment, will be executed, it would be very unwise to write random data values there.