System Programming

ANNA UNIVERSITY TIRUNELVELI / REGULATION 2008
CS54 – SYSTEM SOFTWARE
AIM
To have an understanding of foundations of design of assemblers, loaders, linkers, and macro processors.
OBJECTIVES
 To understand the relationship between system software and machine architecture.
 To know the design and implementation of assemblers
 To know the design and implementation of linkers and loaders.
 To have an understanding of macroprocessors.
 To have an understanding of system software tools.
UNIT I
INTRODUCTION
System software and machine architecture – The Simplified Instructional Computer
(SIC) - Machine architecture - Data and instruction formats - addressing modes instruction sets - I/O and programming.

8

UNIT II
ASSEMBLERS
10
Basic assembler functions - A simple SIC assembler – Assembler algorithm and data structures - Machine dependent assembler features - Instruction formats and addressing modes – Program relocation - Machine independent assembler features - Literals –
Symbol-defining statements – Expressions - One pass assemblers and Multi pass assemblers - Implementation example - MASM assembler.
UNIT III
LOADERS AND LINKERS
Basic loader functions - Design of an Absolute Loader – A Simple Bootstrap Loader Machine dependent loader features - Relocation – Program Linking – Algorithm and
Data Structures for Linking Loader - Machine-independent loader features - Automatic
Library Search – Loader Options - Loader design options - Linkage Editors – Dynamic
Linking – Bootstrap Loaders - Implementation example - MSDOS linker.

9

UNIT IV
MACRO PROCESSORS
9
Basic macro processor functions - Macro Definition and Expansion – Macro Processor
Algorithm and data structures - Machine-independent macro processor features Concatenation of Macro Parameters – Generation of Unique Labels – Conditional Macro
Expansion – Keyword Macro Parameters-Macro within Macro-Implementation example MASM Macro Processor – ANSI C Macro language.
UNIT V
SYSTEM SOFTWARE TOOLS
Text editors -