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Assembler

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Manish Pandey
Manish Pandey
Technologie
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Assemblers System Software by Leland L. Beck Chapter 2
Role of Assembler Source Program Assembler Object Code Loader Executable Code Linker
Chapter 2 -- Outline ,[object Object],[object Object],[object Object],[object Object]
Introduction to Assemblers ,[object Object],[object Object],[object Object],[object Object],[object Object]
Example Program (Fig. 2.1) ,[object Object],[object Object],[object Object],[object Object],[object Object]
Example Program (Fig. 2.1) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Assembler Directives ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Object Program ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Fig. 2.3 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Figure 2.1 (Pseudo code) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
An Example (Figure 2.1, Cont .) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],EOR: character x‘00’
An Example (Figure 2.1, Cont .) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Assembler’s functions ,[object Object],[object Object],[object Object],[object Object],[object Object],Break...
Example of Instruction Assemble ,[object Object],STCH BUFFER,X (54) 16 1 (001) 2 (039) 16 549039
Difficulties: Forward Reference ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Two Pass Assembler ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Two Pass Assembler ,[object Object],[object Object],Pass 1 Pass 2 Object codes Source program OPTAB SYMTAB SYMTAB Intermediate file
Data Structures ,[object Object],[object Object],[object Object]
OPTAB (operation code table) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
SYMTAB (symbol table) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],COPY 1000 FIRST 1000 CLOOP 1003 ENDFIL 1015 EOF 1024 THREE 102D ZERO 1030 RETADR 1033 LENGTH 1036 BUFFER 1039 RDREC 2039
Homework #3 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],End of Sec 2-1
Assembler Design ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Machine-dependent Assembler Features ,[object Object],[object Object],[object Object]
Instruction Format and Addressing Mode ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Translation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
PC-Relative Addressing Modes ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Base-Relative Addressing Modes ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Immediate Address Translation ,[object Object],[object Object],[object Object],[object Object],[object Object]
Immediate Address Translation (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Indirect Address Translation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Program Relocation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Example
Relocatable Program ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Object Code End of Sec 2-2
Machine-Independent Assembler Features Literals Symbol Defining Statement Expressions Program Blocks Control Sections and Program Linking
Literals ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Literals vs. Immediate Operands ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Literal - Implementation (1/3) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Literal - Implementation (2/3) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Literal - Implementation (3/3) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Symbol-Defining Statements ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Symbol-Defining Statements ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
ORG (origin) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
ORG Example ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Expressions ,[object Object],[object Object],[object Object],[object Object],[object Object]
SYMTAB ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Example 2.9 ,[object Object]
Program Blocks ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Program Blocks - Implementation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Figure 2.12 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Program Readability ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
 
Control Sections and Program Linking ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
External Definition and References ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Implementation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Modification Record ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
External References in Expression ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Assembler Design Options One-pass assemblers Multi-pass assemblers Two-pass assembler with overlay structure
Two-Pass Assembler with Overlay Structure ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
One-Pass Assemblers ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
One-Pass Assemblers ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Load-and-go Assembler ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Forward Reference in One-pass Assembler ,[object Object],[object Object],[object Object],[object Object],[object Object]
Load-and-go Assembler (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Producing Object Code ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Multi-Pass Assemblers ,[object Object],[object Object],[object Object],[object Object],[object Object]

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Assembler

  • 1. Assemblers System Software by Leland L. Beck Chapter 2
  • 2. Role of Assembler Source Program Assembler Object Code Loader Executable Code Linker
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  • 34. Object Code End of Sec 2-2
  • 35. Machine-Independent Assembler Features Literals Symbol Defining Statement Expressions Program Blocks Control Sections and Program Linking
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  • 58. Assembler Design Options One-pass assemblers Multi-pass assemblers Two-pass assembler with overlay structure
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