This document discusses assembly language and assemblers. It begins by explaining that assembly language provides a more readable and convenient way to program compared to machine language. It then describes how an assembler works, translating assembly language programs into machine code. The elements of assembly language are defined, including mnemonic operation codes, symbolic operands, and data declarations. The document also covers instruction formats, sample assembly language programs, and the processing an assembler performs to generate machine code from assembly code.
Assemblers Elements of Assembly Language Programming, Design of the Assembler, Assembler Design Criteria, Types of Assemblers, Two-Pass Assemblers, One-Pass Assemblers, Single pass Assembler for Intel x86 , Algorithm of Single Pass Assembler, Multi-Pass Assemblers, Advanced Assembly Process, Variants of Assemblers Design of two pass assembler
Introduction, Macro Definition and Call, Macro Expansion, Nested Macro Calls, Advanced Macro Facilities, Design Of a Macro Preprocessor, Design of a Macro Assembler, Functions of a Macro Processor, Basic Tasks of a Macro Processor, Design Issues of Macro Processors, Features, Macro Processor Design Options, Two-Pass Macro Processors, One-Pass Macro Processors
A macro processor is a system software. Macro is that the Section of code that the programmer writes (defines) once, and then can use or invokes many times.
Description of all types of Loaders from System programming subjects.
eg. Compile-Go Loader
General Loader
Absolute Loader
Relocating Loader
Practical Relocating Loader
Linking Loader
Linker Vs. Loader
general relocatable loader
Assemblers Elements of Assembly Language Programming, Design of the Assembler, Assembler Design Criteria, Types of Assemblers, Two-Pass Assemblers, One-Pass Assemblers, Single pass Assembler for Intel x86 , Algorithm of Single Pass Assembler, Multi-Pass Assemblers, Advanced Assembly Process, Variants of Assemblers Design of two pass assembler
Introduction, Macro Definition and Call, Macro Expansion, Nested Macro Calls, Advanced Macro Facilities, Design Of a Macro Preprocessor, Design of a Macro Assembler, Functions of a Macro Processor, Basic Tasks of a Macro Processor, Design Issues of Macro Processors, Features, Macro Processor Design Options, Two-Pass Macro Processors, One-Pass Macro Processors
A macro processor is a system software. Macro is that the Section of code that the programmer writes (defines) once, and then can use or invokes many times.
Description of all types of Loaders from System programming subjects.
eg. Compile-Go Loader
General Loader
Absolute Loader
Relocating Loader
Practical Relocating Loader
Linking Loader
Linker Vs. Loader
general relocatable loader
loader and linker are both system software which capable of loads the object code, assembled by an assembler, (loader) and link a different kind of block of a huge program. both software works at the bottom of the operation (i.e. closer to the hardware). in fact, both have machine dependent and independent features.
A single pass assembler scans the program only once and creates the equivalent binary program. The assembler substitute all of the symbolic instruction with machine code in one pass.
Explains Language Processors in deep, language processing activities are arises,what is program generation activities,fundamentals of lang. processors,Toy compiler,Grammar, LAPDTs Lex & Yacc
loader and linker are both system software which capable of loads the object code, assembled by an assembler, (loader) and link a different kind of block of a huge program. both software works at the bottom of the operation (i.e. closer to the hardware). in fact, both have machine dependent and independent features.
A single pass assembler scans the program only once and creates the equivalent binary program. The assembler substitute all of the symbolic instruction with machine code in one pass.
Explains Language Processors in deep, language processing activities are arises,what is program generation activities,fundamentals of lang. processors,Toy compiler,Grammar, LAPDTs Lex & Yacc
One pass assembler, Two pass assembler,
Advanced Assembler Directives
Index
------
One-pass assembler
Forward Reference
Two-pass assembler using variant-I
Two-pass assembler using variant-II
Advanced Assembler Directives
Design of two pass assembler
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This presentation is about the working procedure of Shahjalal Fertilizer Company Limited (SFCL). A Govt. owned Company of Bangladesh Chemical Industries Corporation under Ministry of Industries.
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2. Assembly Language Programming
• Writing a program in assembly lang is more
convenient than in machine lang.
• Assembly program is more readable.
• Assembly lang is machine dependent.
• Assembly program is written using
symbols(Mnemonics).
• Assembly program is translated into machine
code before execution.
4. Example:
MOV AX, X
--MOV is a mnemonic opcode.
--AX is a register operand in symbolic form.
--X is a memory operand in symbolic form.
5. Elements of Assembly Language
1. Mnemonic Operation Code:-
Eliminates the need to memorize numeric
operation code.
2. Symbolic Operands:-
Symbolic names can be used.
3. Data Declarations:-
Data can be declared in any form
Eg: -5, 10.5 etc.
6. Statement Format
[Label] <Opcode> <operand Spec> [<operand spec>….]
1. Label:- Is optional.
2. Opcode:- Symbolic opcode
3. Operand:- Symbolic name (Register or Memory
variable)
7. Instruction
Opcode
Assembly
Mnemonic
Remarks
00 STOP Stop Execution
01 ADD Op1 Op1+ Op2
02 SUB Op1 Op1 – Op2
03 MULT Op1 Op1* Op2
04 MOVER CPU Reg Memory operand
05 MOVEM Memory CPU Reg
06 COMP Sets Condition Code
07 BC Branch on Condition
08 DIV Op1 Op1/ Op2
09 READ Operand 2 input Value
10 PRINT Output Operand2
Fig: Mnemonic Operation Codes
9. Assembly Lang to M/C lang Program
1. Find address of variables and labels.
2. Replace Symbolic addr by numeric addr.
3. Replace Symbolic opcodes by machine
opcode.
4. Reserve storage for data.
10. START 101
READ X
READ Y
MOVER AREG, X
ADD AREG, Y
MOVEM AREG, RESULT
PRINT RESULT
STOP
X DS 1
Y DS 1
RESULT DS 1
END
Fig: Sample program to find X+Y
11. START 101
READ X
READ Y
MOVER AREG, X
ADD AREG, Y
MOVEM AREG, RESULT
PRINT RESULT
STOP
X DS 1
Y DS 1
RESULT DS 1
END
LC
101
102
103
104
105
106
107
108
109
110
+ 09 0 108
+ 09 0 109
+ 04 1 108
+ 01 1 109
+ 05 0 110
+ 10 0 110
+ 00 0 000
Opcode Register Memory
operand
15. • Imperative Statements:-
– Indicates an action to be taken during execution of a
program.
– Eg: MOV, ADD, MULT, etc.
• Declaration Statement:-
– To reserve memory for variable.
[Label] DS <constant> eg: X DS 5
[Label] DC ‘<value>’ eg: X DC 3
• Assembler Directives:-
– Instructs the assembler to perform ceratin action during
assembly of a program.
START <constant>
END
16. Literals & Constants
int z=5;
x = x + 5;
1. Literal cannot be changed during program
execution
2. Literal is more safe and protected than a
constant.
3. Literals appear as a part of the instruction.
18. Pass structure of assembler
Pass I Pass II
Intermediate Code
Source
Program
Target
Program
Figure: Overview of Two Pass Assembler
Data Structures
19. Two Pass Translation
• Handles forward references easily.
• Requires 2 scans of the source program.
• LC processing is performed in the 1st pass and
symbols are stored in the symbol table.
• Second pass synthesis Target Program.
20. Single Pass Translation
• The problem of forward reference can be
handled using a technique called as back
patching.
21. START 100
MOVER AREG, X
L1 ADD BREG, ONE
ADD CREG, TEN
STOP
X DC ‘5’
ONE DC ‘1’
TEN DC ‘10’
END
22. START 100
MOVER AREG, X
L1 ADD BREG, ONE
ADD CREG, TEN
STOP
X DC ‘5’
ONE DC ‘1’
TEN DC ‘10’
END
100 04 1 _ _ _
101 01 2 _ _ _
102 06 3 _ _ _
103 00 0 000
104
105
106
Instruction Address Symbol Making a forward reference
100 X
101 ONE
102 TEN
Figure : TII
24. Design of a Two Pass Assembler
• Pass I:-
1. Separate the symbol, mnemonic, opcode and
operand.
2. Build Symbol Table.
3. Perform LC Processing.
4. Construct Intermediate Representation.
• Pass II:-
1.Process IR to synthesize the target program.
25. Pass I
• Pass I uses the following data structures
1. Machine Opcode table (OPTAB)
2. Symbol Table (ST)
3. Literal Table (LT)
4. Pool Table (PT)
26. 1. OPTAB contains opcode, class and opcode
length.
2. SYMTAB contains symbol and address.
3. LITTAB contains literal and address.
4. POOLTAB contains starting literal number of
each pool.
27. START 200
MOVER AREG, =‘5’
MOVEM AREG, X
L1 MOVER BREG, =‘2’
ORIGIN L1+3
LTORG
NEXT ADD AREG,=‘1’
SUB BREG,=‘2’
BC LT, BACK
LTORG
BACK EQU L1
ORIGIN NEXT+5
MULT CREG,=‘4’
STOP
X DS 1
END
LC
200
201
202
205
206
207
208
209
210
211
212
212
213
214
28. Symbol Address Literal Address Pool Table
0
START 200
MOVER AREG,=‘5’ 200
Symbol Address Literal Address
=‘5’ ---
Pool Table
0
29. MOVEM AREG,X 201
Symbol Address
X ----
Literal Address
=‘5’ ---
Pool Table
0
L1 MOVER BREG,=‘2’ 202
Symbol Address
X ----
L1 202
Literal Address
=‘5’ ---
=‘2’ ---
Pool Table
0
30. ORIGIN L1+3 203
Symbol Address
X ----
L1 202
Literal Address
=‘5’ ---
=‘2’ ---
Pool Table
0
LTORG 205
206
Symbol Address
X ----
L1 202
Literal Address
=‘5’ 205
=‘2’ 206
Pool Table
0
2
31. NEXT ADD AREG, =‘1’ 207
Symbol Address
X ----
L1 202
NEXT 207
Literal Address
=‘5’ 205
=‘2’ 206
=‘1’ ----
Pool Table
0
2
SUB BREG,=‘2’ 208
Symbol Address
X ----
L1 202
NEXT 207
Literal Address
=‘5’ 205
=‘2’ 206
=‘1’ ----
=‘2’ -----
Pool Table
0
2
32. BC LT, BACK 209
Symbol Address
X ----
L1 202
NEXT 207
BACK ----
Literal Address
=‘5’ 205
=‘2’ 206
=‘1’ ----
=‘2’ ----
Pool Table
0
2
LTORG 210
211
Symbol Address
X ----
L1 202
NEXT 207
Literal Address
=‘5’ 205
=‘2’ 206
=‘1’ 210
=‘2’ 211
Pool Table
0
2
4
33. BACK EQU L1 212
Symbol Address
X ----
L1 202
NEXT 207
BACK 202
Literal Address
=‘5’ 205
=‘2’ 206
=‘1’ 210
=‘2’ 211
Pool Table
0
2
4
ORIGIN NEXT+5 213
Symbol Address
X ----
L1 202
NEXT 207
BACK 202
Literal Address
=‘5’ 205
=‘2’ 206
=‘1’ 210
=‘2’ 211
Pool Table
0
2
4
34. MULT CREG,=‘4’ 212
Symbol Address
X ----
L1 202
NEXT 207
BACK 202
Literal Address
=‘5’ 205
=‘2’ 206
=‘1’ 210
=‘2’ 211
=‘4’ ----
Pool Table
0
2
4
STOP 213
Symbol Address
X ----
L1 202
NEXT 207
BACK 202
Pool Table
0
2
4
Literal Address
=‘5’ 205
=‘2’ 206
=‘1’ 210
=‘2’ 211
=‘4’ ----
35. X DS 1 214
Symbol Address
X 214
L1 202
NEXT 207
BACK 202
Pool Table
0
2
4
END
Symbol Address
X 214
L1 202
NEXT 207
BACK 202
Pool Table
0
2
4
5
Literal Address
=‘5’ 205
=‘2’ 206
=‘1’ 210
=‘2’ 211
=‘4’ ----
Literal Address
=‘5’ 205
=‘2’ 206
=‘1’ 210
=‘2’ 211
=‘4’ 215