What is offset address?
What is offset address?
In computer engineering and low-level programming (such as assembly language), an offset usually denotes the number of address locations added to a base address in order to get to a specific absolute address. In this context an offset is sometimes called a relative address.
What is start address?
The starting address for the primary thread is, therefore, the same (as it represents the address of the system-supplied function) for every Windows process in the system. However, the StartAddress property allows you to get the starting function address that is specific to your application.
What is base address and offset address?
In computing, a base address is an address serving as a reference point (“base”) for other addresses. Under the relative addressing scheme, to obtain an absolute address, the relevant base address is taken and offset (aka displacement) is added to it.
How is offset address calculated?
2. offset = A mod page_size
- this is the distance from the beginning of the page.
- e.g. address in the process, A = 10,000.
- page size = 4k.
- page offset = 10000 mod 4k = 10,000 mod 4096 = 1908.
- this calculation is done quickly on the computer since the page size is power of 2, e.g., 4k = 2^12.
What is the effective address?
The effective address is the location of an operand of the instruction, since the operand is the data to be accessed. Immediate instructions use their operand to hold the data needed to complete the instruction.
How do you find an effective address?
In the Relative Addressing Mode, the Program Counter (PC) is the implicitly referenced register. So, the effective address is generated by adding the next instruction address to the the address field. Hence, Effective Address = 302 + 400 = 702.
What is base addressing mode?
Base register addressing mode:Base register addressing mode is used to implement inter segment transfer of control.In this mode effective address is obtained by adding base register value to address field value.
How offset address is calculated in 8086?
The address calculated when BP is taken as the offset gives the starting address of the stack. The address when SP is taken as the offset denotes the memory location where the top of the stack lies. Q3) The value of the DS register is 3032H. And the BX register contains a 16 bit value which is equal to 3032H.
How do you convert logical address to physical address in paging?
Divide logical memory into blocks of same size called pages. Keep track of all free frames. To run a program of size n pages, need to find n free frames and load program. Set up a page table to translate logical to physical addresses.
Which register holds the offset address?
Stack pointer (SP) holds the offset address of the stack segment. 4. Base pointer (BP) can be used general register and also used to hold offset address in few instructions.
How is the stack address calculated?
The 8086 calculates a 20-bit physical address by taking the SS register and shifting it left by 4. To this is added the SP offset. In your example: SS is shifted left by 4 to give 12340H.
What is the position of stack pointer after the pop instruction?
In POP instruction, after each execution of the instruction, the stack pointer is a) incremented by 1 b) decremented by 1 c) incremented by 2 d) decremented by 2 Answer: c Explanation: The actual current stack top is poped into the specific operand as the contents of stack top memory is stored in AL&SP and further …
How do you find the 20 bit physical address?
So, Physical Address = Base Address + Offset. Suppose the Data Segment holds the Base Aaddress as 1000h and the data you need is present in the 0020h memory location (Offset) of the Data Segment. The calculation of the actual address is done as follows. So the actual address turns out to be 10020h.