Linking Control Sections in Assemblers
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Questions and Answers

What is the significance of having both terms in an expression within the same control section in a program?

The difference between the two terms is an absolute value.

Explain the consequences of having terms from different control sections in an expression in a program.

The difference in load addresses of the two control sections results in an unpredictable value.

How does the assembler enforce restrictions when an expression involves external references?

The assembler evaluates all terms it can, creates an initial expression value, and generates Modification records for the loader to check.

How are symbols defined in one control section handled in relation to other control sections?

<p>Symbols defined in one control section must be identified as external references and named using the EXTDEF assembler directive to be used by other control sections.</p> Signup and view all the answers

What is the purpose of having control sections in an assembler?

<p>To link control sections together, allowing instructions in one control section to refer to data or instructions in other control sections.</p> Signup and view all the answers

What assembler directive is used to name symbols that are defined in a control section but may be used by other control sections?

<p>EXTDEF (External Definition)</p> Signup and view all the answers

What is the purpose of separating programs into blocks in the context of assembly language programming?

<p>Reduces the addressing problem and eliminates the need for extended format instructions.</p> Signup and view all the answers

How does the use of program blocks help in machine-dependent assembler design?

<p>It reduces the addressing problem, as the larger buffer area is moved to the end of the object program.</p> Signup and view all the answers

Explain the advantage of control sections in assembly language programming.

<p>Control sections maintain their identity after assembly, allowing independent loading and relocation.</p> Signup and view all the answers

How does the loader handle the loading of object programs when program blocks are used?

<p>The loader loads the object program at the indicated address associated with each program block.</p> Signup and view all the answers

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