Dobin 0x10_IntelArchitecture.pdf
Dobin 0x10_IntelArchitecture.pdf
Dobin 0x10_IntelArchitecture.pdf
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| Karten | 11 |
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| Sprache | English |
| Kategorie | Informatik |
| Stufe | Universität |
| Erstellt / Aktualisiert | 21.06.2019 / 27.06.2020 |
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What are registers?
Registers are the "variables" on the CPU
Immnediate acces for the CPU
Cannot write Memory -> Memory
- Aways: Memory -> Register -> Memory
What can be held in registers?
Register can hold:
- Data (numbers)
- Addresses (also numbers, but with a different meaning)
What can registers be used for?
Registers can be used to:
- Perform computations
- Read / Write memory
- Execute instructions
Name some registers in a 32 bit system and their function.
- EAX -> Adding stuff
- EBX -> Referencing stuff
- ECX -> Counting stuff
- EDX -> Data stuff
- ESI -> Points to a source
- EDI -> Points to a destination
Name the 3 registars that contain instruction pointer, stack pointer and base Pointer. (32 bit)
- EIP -> Instruction Pointer -> Next instruction to be executed
- ESP -> Stack Pointer -> Top of Stack
- EBP -> Base Pointer -> Current Stack Frame (Bottom)
How does a CPU interpret instructions?
A CPU looks at bytes, and then decides what to execute based on them.
What is the difference between big and little endian?
Big endian: The most significant byte of the data is placed at the byte with the lowest address.
Little endian: The least significant byte of the data is placed at the byte with the lowest address.
What are the 2 most important rings in the ring modle and what are their characteristics?
Ring 0: Kernel (Kernelspace)
- Can be intercated with by using "syscalls"
Ring 3: Userspace
- Where all programs run
How to transit from userspace to kernelspace?
- System Calls (syscall)
