Podcast
Questions and Answers
What does the CALL instruction do?
What does the CALL instruction do?
A local label is visible to statements outside its procedure.
A local label is visible to statements outside its procedure.
False
What is the primary purpose of the RET instruction?
What is the primary purpose of the RET instruction?
To pop the return address from the stack and load it into EIP.
In nested procedure calls, the stack stores the ______ addresses.
In nested procedure calls, the stack stores the ______ addresses.
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Match the following terms with their corresponding descriptions:
Match the following terms with their corresponding descriptions:
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What is the primary purpose of dividing large problems into smaller tasks when creating procedures?
What is the primary purpose of dividing large problems into smaller tasks when creating procedures?
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The RET instruction pushes the return address onto the stack.
The RET instruction pushes the return address onto the stack.
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What instruction is used to call a procedure in assembly language?
What instruction is used to call a procedure in assembly language?
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The _____ instruction is used to return from a procedure.
The _____ instruction is used to return from a procedure.
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Which of the following is NOT a suggested piece of documentation for a procedure?
Which of the following is NOT a suggested piece of documentation for a procedure?
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Match the following Assembly Language instructions with their functions:
Match the following Assembly Language instructions with their functions:
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In the SumOf procedure example, what registers are used as input parameters?
In the SumOf procedure example, what registers are used as input parameters?
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If a procedure is called without its preconditions being satisfied, the procedure's creator still guarantees that it will work correctly
If a procedure is called without its preconditions being satisfied, the procedure's creator still guarantees that it will work correctly
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Study Notes
Defining and Using Procedures
- Procedures are blocks of code that perform specific tasks. They are a fundamental building block in programming.
- Defining a procedure involves specifying its purpose, input, and output.
- Procedures make code reusable which saves effort and helps maintain and organize the project
Creating Procedures
- Procedures can be defined and used to create structured, organized, and reusable code.
Documenting Procedures
- Procedures need proper documentation.
- Information about what inputs a procedure receives, what values it returns, and which conditions it depends on should be included.
- Pre-conditions are conditions that must be met before a procedure can be executed successfully; they are requirements.
Example: SumOf Procedure (likely a programming language example)
- Describes an example of a procedure named "SumOf".
CALL and RET Instructions
- CALL is an instruction to call a procedure.
- RET is an instruction to return from a procedure.
CALL-RET Example
- CALL (and RET) instructions affect the stack pointer (ESP) register and the instruction pointer (EIP) register.
- CALL saves the address of the next instruction to be executed (pushing the return address).
- When procedures are called, their return address is saved to the stack
Nested Procedure Calls
- Procedures can be nested, meaning one procedure calls another.
- Each call pushes the next return address onto the stack.
- The stack keeps track of all the calling context, enabling each return from Sub1, Sub2, and Sub3, which are procedures nested within the main procedure.
- When procedures end, using RET, they return to the part of the program where the call occurred.
Local and Global Labels
- Labels are used to mark specific instructions or locations within a program.
- Local labels, used within a procedure, are not generally accessible from outside of that procedure.
- Global labels have wider scope; they can be referenced from other parts of the program.
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Description
Test your knowledge of key assembly language instructions including CALL and RET. This quiz covers the visibility of local labels and the workings of procedure calls. Challenge yourself to match terms with their appropriate descriptions.
