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Where are global variables tored?
In a segment of memory, whose name is 'data segment'
What is Code segment in C program?
A code segment, also known as the text segment holds all the executable instructions of the process. The text segment usually starts from the lowest address space of the process memory (leaving behind a small unmapped memory ..not mapped to a physical memory) --Vivek Purushotham (vivek.purushotham@gmail.com)
Which of the following types of memory contain data that cannot be modified by the user?
Pick one: ROM, PROM, EPROM write-protected magnetic disk/tape, CD-ROM, DVD-R write-protected partition/file, other user's or sysadmin's file code-segment, read-only data-segment, other user's or kernel's code- or data-segment
Write a program in 8086 assembly language that copies a string to another location in the memory?
; program for moving a string from one block of memory ;to another block of memory data segment str1 db 'suriya',0 str2 db 20 dup(0) data ends code segment assume cs:code,ds:data,es:data start: mov ax,data mov ds,ax mov es,ax mov cx,6 lea si,str1 lea di,str2 cld rep movsb int 3h code ends end start
Is memory allocated at runtime for the static variables?
No. Static memory is allocated at compile time. Static variables are allocated within the program's data segment which is a physical part of the executable. When you load the executable into memory, the operating system sets aside enough memory for the entire executable and copies it, byte for byte, into that memory. So when the program is executed, the data segment is already allocated.
What is the difference between program and data memory?
When the program is compiled and linked different parts of the program is organised in separate segments. That is our code will be in one segment code means the instructions to be executed this is called as code segment or program memory this is usually readonly. Then there are data which on which the code operates,these data get stored in a segment called data segment. Stack memory is a part of programs memory which will be used as stack in case of function calls to store the IP and parameters variables of the current function. The three types of memory specified above are owned by the corresponding process or program the linker will give info abt where to store which data to the loader, based on these infos loader will load the corresponding image i.e executable in the memory.
What is the need for code data segment?
The code data segment is essential in a program's memory architecture as it stores the executable instructions of a program. This separation allows the operating system to protect the code from being modified during execution, enhancing security and stability. Additionally, organizing code in a distinct segment optimizes the loading process and improves the efficiency of memory usage, as instructions can be easily accessed and executed by the CPU. Overall, the code segment is vital for maintaining the integrity and performance of software applications.
What is the function of data segment register?
The data segment register (DS) is a critical component in the architecture of x86 processors, primarily used to point to the segment of memory that contains data. It helps manage memory by allowing the CPU to access a specific area of memory where variables and data structures are stored. By using the DS, the processor can efficiently read from and write to the data segment, facilitating organized memory access in segmented memory models.
What is the example of segment register?
There are four segment registers on the 8086 and 8088. These are CS (code for code), DS (data segment), ES (extra data segment), and SS (stack segment).
Where are global variables tored?
In a segment of memory, whose name is 'data segment'
What is default offset register for DATA SEGMENT?
The default offset register for the data segment in x86 architecture is the Data Segment Register (DS). When accessing data in memory, the DS register is used in conjunction with an offset to point to the location of the data within the data segment. This allows the CPU to retrieve data efficiently from memory. If no specific segment override is used, the DS register is assumed for data accesses.
How does memory segmentation increase processors speed?
The segmentation function maintains a segment table that includes physical addresses of the segment, size, and other data. Segmentation speeds up a computer's information retrieval by assigning related data into a “segment table” between the CPU and the physical memory.
What is the segment of the data bus that connects RAM to the processor?
The usage of "segment" and "data bus" in the question appears inconsistent, and does not completely make sense. If you mean the data segment in the 8086/8088, then this is the region of memory mapped by the Data Segment (DS) register, usually reserved for operands in memory. If you are talking about the 8085, then the question does not make sense at all.
What are the function of segment register?
The segment register in the 8086/8088 provide a base address for any memory access. There are four segment registers, CS - Code Segment, DS - Data Segment, SS - Stack Segment, and ES - Extra Segment. Each in used in the context of a particular instruction and contains the base address of the memory segment divided by 16. This allows the processor to access up to 1 MB of memory, though only in segments of 64 KB at a time.
How the CPU will give the logical segment base addresses and offset addresses?
The CPU uses the segment registers to provide the base addresses for logical segments, which correspond to parts of a program's memory, such as code, data, and stack segments. When an application references a memory address, it specifies a segment selector (the logical segment) and an offset within that segment. The CPU combines the base address from the segment register with the offset to calculate the physical address in memory. This segmentation allows for organized memory management and protection between different segments of a program.
What is .model small in 8086?
One code-segment. One data-segment. Thus neither code nor data may be greater than 64K
What is Code segment in C program?
A code segment, also known as the text segment holds all the executable instructions of the process. The text segment usually starts from the lowest address space of the process memory (leaving behind a small unmapped memory ..not mapped to a physical memory) --Vivek Purushotham (vivek.purushotham@gmail.com)
