Assembler

Role of Assembler Chap 2 Source Program Assembler Object Code Loader Executable Code Linker

Chapter 2 -- Outline ,[object Object],[object Object],[object Object],[object Object],Chap 2

Introduction to Assemblers ,[object Object],[object Object],[object Object],[object Object],[object Object],Chap 2

Example Program (Fig. 2.1) ,[object Object],[object Object],[object Object],[object Object],[object Object],Chap 2

Example Program (Fig. 2.1) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Chap 2

Assembler Directives ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Chap 2

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],Chap 2

Fig. 2.3 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Chap 2

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],Chap 2

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],Chap 2 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],Chap 2

Assembler’s functions ,[object Object],[object Object],[object Object],[object Object],[object Object],Chap 2 Break...

Example of Instruction Assemble ,[object Object],Chap 2 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],Chap 2

Two Pass Assembler ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Chap 2

Two Pass Assembler ,[object Object],[object Object],Chap 2 Pass 1 Pass 2 Object codes Source program OPTAB SYMTAB SYMTAB Intermediate file

Data Structures ,[object Object],[object Object],[object Object],Chap 2

OPTAB (operation code table) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Chap 2

SYMTAB (symbol table) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Chap 2 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],Chap 2 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],Chap 2

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],Chap 2

Translation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Chap 2

PC-Relative Addressing Modes ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Chap 2

Base-Relative Addressing Modes ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Chap 2

Immediate Address Translation ,[object Object],[object Object],[object Object],[object Object],[object Object],Chap 2

Immediate Address Translation (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Chap 2

Indirect Address Translation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Chap 2

Program Relocation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Chap 2

Relocatable Program ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Chap 2

Object Code Chap 2 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],Chap 2

Literals vs. Immediate Operands ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Chap 2

Literal - Implementation (1/3) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Chap 2

Literal - Implementation (2/3) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Chap 2

Literal - Implementation (3/3) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Chap 2

Symbol-Defining Statements ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Chap 2

Symbol-Defining Statements ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Chap 2 ,[object Object]

ORG (origin) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Chap 2

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],Chap 2

Expressions ,[object Object],[object Object],[object Object],[object Object],[object Object],Chap 2

SYMTAB ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Chap 2

Example 2.9 ,[object Object],Chap 2

Program Blocks ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Chap 2

Program Blocks - Implementation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Chap 2

Figure 2.12 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Chap 2

Program Readability ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Chap 2

Control Sections and Program Linking ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Chap 2

External Definition and References ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Chap 2

Implementation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Chap 2

Modification Record ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Chap 2

External References in Expression ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Chap 2

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],Chap 2

One-Pass Assemblers ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Chap 2

One-Pass Assemblers ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Chap 2

Load-and-go Assembler ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Chap 2

Forward Reference in One-pass Assembler ,[object Object],[object Object],[object Object],[object Object],[object Object],Chap 2

Load-and-go Assembler (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Chap 2

Producing Object Code ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Chap 2

Multi-Pass Assemblers ,[object Object],[object Object],[object Object],[object Object],[object Object],Chap 2

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