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CPU: It is basically using a control unit, execution unit, registers, and flags.
Control unit:
-> Retrieve/decode instructions, retrieve/store in memory.
Execution unit:
-> Actual execution of instructions happens here.
Registers:
-> Internal memory locations used as a variables.
Flags:
-> Used to indicate various "EVENTS" when execution is happening.
EAX (Extend accumulator register): Used for storing operands and result in data.
-> EBX (Extend base register): Pointer to data.
-> ECX (Extend counter register): For loop operations.
-> EDX (Extend data register): Input and Output pointer.
-> ESI (Extend source index) and EDI (: Data pointer registers for memory operations
-> ESP (Extend stack pointer register):
-> EBP (Extend base pointer register):
stack frame pointer - ESP
when a function A pointer to B, SFP pushed to the stack
The stack frame consists of the SFP address, return address
after the function of B then it has to go to perv function so the address of the next instruction stored in the return address, the location of the current stack pointer holds by EBP.
EIP is an interesting, pointer address or next return address, we can use this address in which directions we instruct.
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