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Question:
Is endianness the order in which bytes are stored in memory?
Answer:
True
Question:
What is the difference between Little Endian and Big Endian?
The order of the bits within a byte
The order of the bytes in a multi-byte value
The size of the data types used
Answer:
The order of the bytes in a multi-byte value
Question:
In Little Endian, the least significant byte is stored at the __________ address.
Answer:
lowest
Question:
Why is understanding endianness important in embedded systems?
Answer:
Understanding endianness is important to ensure proper communication and compatibility between different systems and devices.
Question:
Is endian ordering important when programming?
Answer:
True
Question:
In embedded systems, the ________ is often copied to RAM after boot for efficiency.
Answer:
ROM/FLASH
Question:
Describe the purpose of the BSS segment in embedded systems.
Answer:
The BSS segment is used for non explicitly initialized data in the program.
Question:
Is it recommended to call library functions in an interrupt handler?
Answer:
False
Question:
What should you avoid including in an interrupt handler?
Long running operations
Short bursts of data
Delay functions
Answer:
Long running operations
Question:
On ARM, R13 is also known as the ________.
Answer:
SP (stack pointer)
Question:
Explain the ARM Procedure Call Standard for parameter passing.
Answer:
The first four parameters are passed in R0-R3, subsequent parameters are passed on the stack, and the return value is in R0.
Question:
Is it necessary to preserve registers R0-R3 in ARM?
Answer:
False
Question:
What is the expected behavior for registers R4 and up in ARM functions?
They should be preserved by the caller
They should be left alone by the caller
They should be trashed by the caller
Answer:
They should be left alone by the caller
Question:
GNU ARM Assembly provides an easy way to push and pop registers using the ________ keyword.
Answer:
push/pop
Question:
Explain the contract between the caller and the callee in ARM functions regarding register usage.
Answer:
The caller expects R0-R3 to be overwritten, while the callee can use them freely but must preserve R4 and up.
Question:
Is the contract between the caller and the callee regarding register usage negotiable?
Answer:
False
Question:
What is the purpose of the LR register in ARM?
Answer:
The LR register is the link register for subroutines in ARM.
Question:
In ARM assembly language, is it necessary to preserve registers before using them?
Answer:
True
Question:
What is the purpose of pushing and popping registers in ARM assembly language?
To save and restore register values
To modify register values
To skip certain instructions
Answer:
To save and restore register values
Question:
__________ is an absolute convention in ARM assembly language for preserving registers.
Answer:
Push and pop
Question:
Why is it important to follow certain conventions in ARM assembly language programming?
Answer:
Following conventions ensures code consistency and helps avoid hard-to-troubleshoot bugs.
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