This document discusses assembly language basics including instruction syntax, operands, constants, comments, and data definition directives. It also covers the unified assembly language (UAL) used for ARM and Thumb instructions, which allows selection of 16-bit and 32-bit instructions using the same syntax. Suffixes can specify instruction width, and 32-bit Thumb-2 instructions can be half word aligned.
A different approach to learn assembly language programming for microprocessors. Please download the presentation as it contains lots of animations which are not supported by the slideshare slide show.
A different approach to learn assembly language programming for microprocessors. Please download the presentation as it contains lots of animations which are not supported by the slideshare slide show.
This presentation covers very basics of assembly language with some computer organization concept. I took this session as part of on going series on assembly at NULL Hyderabad meets. PART II will cover instruction sets and more in detail.
Advance procedures in assembly are fully explained by me and my group mates.
Main topics are:
*Stack frames
-Recursion
-ADDR, INVOKE , LOCAL, PROC , PROTO directives and variables
-MultiModule Programs in assembly
In this presentation we will cover Subroutines and Flag variables of arm architecture. And also Information About ARM Architecture registers Flag variables and subroutines.
This presentation covers very basics of assembly language with some computer organization concept. I took this session as part of on going series on assembly at NULL Hyderabad meets. PART II will cover instruction sets and more in detail.
Advance procedures in assembly are fully explained by me and my group mates.
Main topics are:
*Stack frames
-Recursion
-ADDR, INVOKE , LOCAL, PROC , PROTO directives and variables
-MultiModule Programs in assembly
In this presentation we will cover Subroutines and Flag variables of arm architecture. And also Information About ARM Architecture registers Flag variables and subroutines.
Embedded Systems (18EC62) - ARM Cortex-M3 Instruction Set and Programming (Mo...Shrishail Bhat
Lecture Slides for Embedded Systems (18EC62) - ARM Cortex-M3 Instruction set and Programming (Module 2) for VTU Students
Contents
Assembly basics, Instruction list and description, Thumb and ARM instructions, Special instructions, Useful instructions, CMSIS, Assembly and C language Programming
Computer architecture is made up of two main components the Instruct.docxbrownliecarmella
Computer architecture is made up of two main components the Instruction Set Architecture (ISA) and the RTL model for the CPU.
In this class, we will have two software projects that will help in your understanding of the ISA and RTL model for the CPU.
The projects can be done in any software language that you chose to use.
The first project is the creation of an assembler.
The assembler will be use for you to write assembly language programs that will be executed on the CPU you will design in project #2.
The CPU we will be using is based on the DLX design.
What is an assembler?
All computer software goes through a set of applications to create an executable file that can be used by the end user.
The first program a programmer will used is a high level language program (C, C++, etc.).
The programmer writes in a very high level abstract environment writing code such as:
For(x=0; x< 10; x++)
A[x] = x;
The high level language allows the programmer to write his program without knowing how the ISA and hardware architecture functions.
The language hides all the hardware from the programmer.
At some point, the source code needs to be transfer to a language that takes into account the ISA and hardware architecture.
The complier is the next step in the development process.
The complier will take in high-level source code and translate the program into assembly language.
Assembly language is the ISA for a computer.
Assembly is the instructions that the computer can perform.
The compiler will do the following:
C language:
c = a + b;
Assembly:
load r1, a
Load r2,b
Add r3,r1,r2
Store r3,c
The last part of the development process is taking the assembly code created by the complier and transferring into machine code that the computer will execute.
A computer is not able to run written language such as ADD r1,r2,r3.
The computer runs a program by reading data stored in memory.
The memory does not the store the command ADD r1,r2,r3 but store machine code.
Machine code is the binary representation of an assembly language instruction.
The DLX Machine code
All the information for the DLX machine code and assembly instructions can be found in the handouts given in class. Each of the DLX instruction is 32-bits in length.
Each part of the instruction is assigned a set of bits in the instruction.
DLX break down the instructions into three different types R,I, and J.
R-type instruction
An example of the R-type instruction is ADD rd, rs1, rs2
The instruction is 32-bits in length:
Bits 31-26 is the opcode. The opcode tell the CPU what instruction it is doing
Bits 25-21 is the rs1
Bits 20-16 is the rs2
Bits 15-11 is the rd
Bits 10-0 is the funct.
Funct tells what type of ALU operation is being conducted.
I-type instruction
Ex ADDI rs1,rs2,immm
Bits 31-26 is the opcode
Bits 25-21 is rs1
Bits 20-16 is rs2
Bits 15-0 is immediate.
The immediate value is the constant value to use in the instruction
J-type instruction
Ex J address
Bits ...
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Student information management system project report ii.pdfKamal Acharya
Our project explains about the student management. This project mainly explains the various actions related to student details. This project shows some ease in adding, editing and deleting the student details. It also provides a less time consuming process for viewing, adding, editing and deleting the marks of the students.
Immunizing Image Classifiers Against Localized Adversary Attacksgerogepatton
This paper addresses the vulnerability of deep learning models, particularly convolutional neural networks
(CNN)s, to adversarial attacks and presents a proactive training technique designed to counter them. We
introduce a novel volumization algorithm, which transforms 2D images into 3D volumetric representations.
When combined with 3D convolution and deep curriculum learning optimization (CLO), itsignificantly improves
the immunity of models against localized universal attacks by up to 40%. We evaluate our proposed approach
using contemporary CNN architectures and the modified Canadian Institute for Advanced Research (CIFAR-10
and CIFAR-100) and ImageNet Large Scale Visual Recognition Challenge (ILSVRC12) datasets, showcasing
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adversary training.
Water scarcity is the lack of fresh water resources to meet the standard water demand. There are two type of water scarcity. One is physical. The other is economic water scarcity.
CFD Simulation of By-pass Flow in a HRSG module by R&R Consult.pptxR&R Consult
CFD analysis is incredibly effective at solving mysteries and improving the performance of complex systems!
Here's a great example: At a large natural gas-fired power plant, where they use waste heat to generate steam and energy, they were puzzled that their boiler wasn't producing as much steam as expected.
R&R and Tetra Engineering Group Inc. were asked to solve the issue with reduced steam production.
An inspection had shown that a significant amount of hot flue gas was bypassing the boiler tubes, where the heat was supposed to be transferred.
R&R Consult conducted a CFD analysis, which revealed that 6.3% of the flue gas was bypassing the boiler tubes without transferring heat. The analysis also showed that the flue gas was instead being directed along the sides of the boiler and between the modules that were supposed to capture the heat. This was the cause of the reduced performance.
Based on our results, Tetra Engineering installed covering plates to reduce the bypass flow. This improved the boiler's performance and increased electricity production.
It is always satisfying when we can help solve complex challenges like this. Do your systems also need a check-up or optimization? Give us a call!
Work done in cooperation with James Malloy and David Moelling from Tetra Engineering.
More examples of our work https://www.r-r-consult.dk/en/cases-en/
2. ASSEMBLY LANGUAGE : BASIC SYNTAX
In assembler code, the following instruction formatting is
commonly used:
label
opcode operand1, operand2, ...; Comments
The label is optional. Some of the instructions might have a label in
front of them so that the address of the instructions can be
determined using the label.
Then, we will find the opcode (the instruction) followed by a
number of operands. Normally, the first operand is the destination
of the operation.
3. The number of operands in an instruction depends on the type
of instruction.
The syntax format of the operand can also be different. For
example, immediate data are usually in the form #number, as
shown here:
MOV R0, #0x12 ; Set R0 = 0x12 (hexadecimal)
MOV R1, #'A' ; Set R1 = ASCII character A
The text after each semicolon (;) is a comment. These
comments do not affect the program operation, but they can
make programs easier for humans to understand.
4. We can define constants using EQU, and then use them inside your
program code. For example,
NVIC_IRQ_SETEN0 EQU 0xE000E100
NVIC_IRQ0_ENABLE EQU 0x1
...
LDR R0,=NVIC_IRQ_SETEN0; ; LDR here is a pseudo-instruction that
; convert to a PC relative load by
; assembler.
MOV R1,#NVIC_IRQ0_ENABLE ; Move immediate data to register
STR R1,[R0] ; Enable IRQ 0 by writing R1 to address
; in R0
A number of data definition directives are available for insertion of
constants inside assembly code.
For example, DCI (Define Constant Instruction) can be used to code
an instruction if your assembler cannot generate the exact instruction
that we want and if we know the binary code for the instruction.
DCI 0xBE00 ; Breakpoint (BKPT 0), a 16-bit instruction
5. We can use DCB (Define Constant Byte) for byte size constant values,
such as characters, and Define Constant Data (DCD) for word size
constant values to define binary data in your code.
LDR R3,=MY_NUMBER ; Get the memory address value of MY_NUMBER
LDR R4,[R3] ; Get the value code 0x12345678 in R4
...
LDR R0,=HELLO_TXT ; Get the starting memory address of
; HELLO_TXT
BL PrintText ; Call a function called PrintText to
; display string
...
MY_NUMBER
DCD 0x12345678
HELLO_TXT
DCB "Hellon",0 ; null terminated string
6. ASSEMBLER LANGUAGE : USE OF SUFFIXES
For the Cortex-M3, the conditional execution suffixes are usually
used for branch instructions.
However, other instructions can also be used with the conditional
execution suffixes if they are inside an IF-THEN instruction
block.
In this cases, the S suffix and the conditional execution
suffixes can be used at the same time.
7.
8. ASSEMBLER LANGUAGE : UNIFIED
ASSEMBLER LANGUAGE
To support and get the best out of the Thumb®-2 instruction set, the
Unified Assembler Language (UAL) was developed to allow selection
of 16-bit and 32-bit instructions and to make it easier to port
applications between ARM code and Thumb code by using the same
syntax for both. (With UAL, the syntax of Thumb instructions is now
the same as for ARM instructions.)
ADD R0, R1 ; R0 = R0 + R1, using Traditional Thumb syntax
ADD R0, R0, R1 ; Equivalent instruction using UAL syntax
9. The traditional Thumb syntax can still be used. The choice between
whether the instructions are interpreted as traditional Thumb code or
the new UAL syntax is normally defined by the directive in the
assembly file.
For example, with ARM assembler tool, a program code header with
“CODE16” directive implies the code is in the traditional Thumb
syntax, and “THUMB” directive implies the code is in the new UAL
syntax.
One thing you need to be careful with reusing traditional Thumb is
that some instructions change the flags in APSR, even if the S suffix
is not used. However, when the UAL syntax is used, whether
the instruction changes the flag depends on the S suffix. For
example,
AND R0, R1 ; Traditional Thumb syntax
AND R0, R0, R1 ; Equivalent UAL syntax (S suffix is added)
10. With the new instructions in Thumb-2 technology, some of the
operations can be handled by either a Thumb instruction or a
Thumb-2 instruction.
For example, R0 = R0 + 1 can be implemented as a 16-bit Thumb
instruction or a 32-bit Thumb-2 instruction.
With UAL, you can specify which instruction you want by adding
suffixes:
ADDS R0, #1 ; Use 16-bit Thumb instruction by default
; for smaller size
ADDS.N R0, #1 ; Use 16-bit Thumb instruction (N=Narrow)
ADDS.W R0, #1 ; Use 32-bit Thumb-2 instruction (W=wide)
11. The .W (wide) suffix specifies a 32-bit instruction. If no suffix is
given, the assembler tool can choose either instruction but usually
defaults to 16-bit Thumb code to get a smaller size.
Depending on tool support, you may also use the .N (narrow)
suffix to specify a 16-bit Thumb instruction.
Again, this syntax is for ARM assembler tools. Other assemblers
might have slightly different syntax.
If no suffix is given, the assembler might choose the instruction for
you, with the minimum code size In most cases, applications will be
coded in C, and the C compilers will use 16-bit instructions if
possible due to smaller code size. However, when the immediate
data exceed a certain range or when the operation can be better
handled with a 32-bit Thumb-2 instruction, the 32-bit instruction
will be used.
12. The 32-bit Thumb-2 instructions can be half word aligned. For
example, you can have a 32-bit instruction located in a half word
location.
0x1000 : LDR r0,[r1] ;a 16-bit instructions (occupy 0x10000x1001)
0x1002 : RBIT.W r0 ;a 32-bit Thumb-2 instruction (occupy
; 0x1002-0x1005)
Most of the 16-bit instructions can only access registers R0–R7;
32-bit Thumb-2 instructions do not have this limitation.
However, use of PC (R15) might not be allowed in some of the
instructions. Refer to the ARM v7-M Architecture Application
Level Reference Manual [Ref. 2] (section A4.6) if you need to
find out more detail in this area.