VTU System Software - June 2015 Exam Question Paper

VTU Computer Science (Semester 5)
System Software
June 2015

Total marks: --
Total time: --

INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary

1 (a) Give any two differences between SIC and SIC/XE machine architecture.

4 M

1 (b) Explain in detail the architecture of a SIC/XE machine.

10 M

1 (c) Write a subroutine in SIC/XE to read a 100-byte record from a device 'F5' into BUFFER use immediate and register-to-register instructions.

6 M

2 (a) What is a forward reference? How to solve this forward reference in assembler?

4 M

2 (b) What are the 3 different records used in object program and write their formats?

6 M

2 (c) Generate the objects code for the instruction shown below:

1) 0006 CLOOP	+JSUP	RDREC
2) 0017	J	CLOOP
3) 0020	LDA	#3
4) 103C	+LDT	#4096
5) 002A	J	@RETADR

Note : JSUB=8, J=3C, LDA=00, LDT=74, RDREC=1036, RETADR=0030.

10 M

3 (a) Enlist the various machine independent assembler features.

5 M

3 (b) With suitable example, explain the use of LTORG assembler directive.

5 M

3 (c) Explain the multi pass assembler with example.

10 M

4 (a) What are basic functions of loader? Develop an algorithm for a bootstrap loader.

10 M

4 (b) What is the difference between linkage editor and linking loader?

4 M

4 (c) Explain various data structures used for a linking loader.

6 M

5 (a) Explain the relationship between editing and viewing buffers with relevant diagram.

10 M

5 (b) Differentiate between tracing and traceback functions in a debugging system.

4 M

5 (c) Mention the different precessions for future assembler and compiler consistent interface with debugging system.

6 M

6 (a) List the different tables used for macroprocessor. Explain their functions.

8 M

6 (b) Explain with example, concatenation of macro parameter and generation of unique labels.

12 M

7 (a) Explain the structures of LEX specification with example.

10 M

7 (b) What is symbol table? Write a LEX program to implement symbol table.

10 M

8 (a) What is YACC? Explain the different sections used in writing the YACC specifications.

10 M

8 (b) Explain conflicts in YACC with example.

5 M

8 (c) Write YACC program to check whether the given string b^aa^a(n>0) is accepted by grammar or not.

5 M

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