Use the following data definitions until notified otherwise Byte1 BYTE 0FFh, 1,2 Byte2
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Use the following data definitions until notified otherwise Byte1 BYTE 0FFh, 1,2 Byte2 Byte 14h Word1 WORD 0FFFFh, 1,2 Word2 WORD 3 Word3 sWORD 7FFFh, 8000h Word4 SWORD 9000h Dword1 DWORD 10h, 20h, 30h, 40h dArray DWORD 10 DUP (?) 11. Implement the following expression in assembly language, using 32 bit integers (you may modify any registers you wish) Eax=dword1+ebx-ecx 12. Implement the following expression in assembly language, using 32 bit integers (you may modify Any registers you wish) Eax=dword1+ (edx-ecx)+1 13. Implement the following expression in assembly language using 32 bit integers. The notation dword (1) corresponds by an array reference in C++ of Java dArray (0)= dArray (1) + dArray (2) 14. Use the following data declaration to write an assembly language loop that copies the string from source to target. Use indexed addressing with EDI and use the LOOP instruction Source BYTE
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Similar to Use the following data definitions until notified otherwise Byte1 BYTE 0FFh, 1,2 Byte2
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corrent code:
Solution
data barray BYTE 6 DUP (?) dwarray DWORD 3 DUP (?) TOTAL_LENGTH = $-barray
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0ah, \"Seeing bytes in a single word\", 0dh, 0ah, 0 lengthmessage BYTE 0dh, 0ah, \"total bytes
used: \", 0 finalmessage BYTE 0dh, 0ah, \"Press any key to continue ...\", 0 .code main PROC
CALL Crlf MOV edx, OFFSET bdmessage CALL WriteString MOV eax, DWORD
PTR [barray + 2] CALL WriteDec MOV edx, OFFSET dwmessage CALL WriteString
MOVZX eax, WORD PTR [dwarray + 6] CALL WriteDec MOV edx, OFFSET
lengthmessage CALL WriteString MOV eax, TOTAL_LENGTH CALL WriteDec
MOV edx, OFFSET finalmessage CALL WriteString CALL ReadChar INVOKE
ExitProcess, 0 main ENDP END main.
[ASM]Lab8
This document discusses assembly language string primitives instructions including MOVSx, CMPSx, SCANSx, STOSx, LODSx. It explains how these instructions use registers like ESI, EDI to operate on strings and arrays. Examples are provided to copy arrays, compare strings, find characters in strings, fill arrays, and multiply array elements. Two-dimensional arrays are also discussed where rows are stored sequentially in memory. Hands-on exercises demonstrate using these instructions to work with strings and 2D arrays.
How to recover malare assembly codes
This document discusses recovering malware assembly codes from self-modifying programs. It presents the problem of reconstructing the control flow graph (CFG) of an encrypted program based on a memory snapshot and execution trace. Key challenges include indirect jumps, junk code insertion, and misaligned overlapping code. The proposed method constructs a partial CFG from the trace, then searches for missing codes and splits blocks to resolve misalignments. Dynamic typing of memory with reading, writing, and execution levels is used to model self-modifying behavior. The overall goal is to synchronize conflicting partial CFGs using traces and statistical recognition to fully recover encrypted assembly codes.
Programming Hp33s talk v3
This document summarizes programming techniques for the HP 33s calculator. It begins by describing the HP 33s' capabilities and limitations compared to the HP 32sII. The main techniques discussed are using as few labels as possible, repeating conditional tests instead of using labels, and storing intermediate results in program memory instead of variables. Bitwise logic operations are implemented by processing truth tables. Sorting and linear least squares routines are also presented. The document emphasizes coding within the 33s' restrictions while taking advantage of its large program memory.
Home works summary.pptx
This document contains several assembly language programming questions and examples. Some questions ask to write programs that perform operations like copying data, searching memory, or manipulating values in registers and memory. Examples are provided that show code to calculate 2^5, divide a number by 16, and scroll the text display upward by moving each text line up one row.
AES by example
The document provides an overview of the Advanced Encryption Standard (AES) algorithm. It defines key terms like block, state, and XOR used in AES. It then describes the AES algorithm which works by repeating rounds that include byte substitution, shifting rows, mixing columns, and adding a round key. The number of rounds depends on the key size, being 10 for a 16-byte key and 14 for a 32-byte key. Encryption and decryption are similar processes performed in reverse order.
String_manipulations.pdf
The document discusses string handling instructions in 8086. It explains that 8086 has special instructions to handle strings of bytes or words using pointers. The SI and DI pointers are used to point to source and destination strings by default. String instructions automatically increment or decrement the pointers depending on the direction flag. Instructions like MOVSB, LODSB, STOSB, CMPSB, and SCASB allow moving, loading, storing, comparing and scanning strings. The REP and REPE/REPNE prefixes can be used with these instructions to repeat the operation multiple times. It also discusses signed number representation and overflow problems in signed number arithmetic.
Low-level Shader Optimization for Next-Gen and DX11 by Emil Persson
The document discusses low-level shader optimization techniques for next-generation consoles and DirectX 11 hardware. It provides lessons from last year on writing efficient shader code, and examines how modern GPU hardware has evolved over the past 7-8 years. Key points include separating scalar and vector work, using hardware-mapped functions like reciprocals and trigonometric functions, and being aware of instruction throughput and costs on modern GCN-based architectures.
Applied Design Patterns - A Compiler Case Study
The document discusses applying design patterns to compiler code. It begins with an overview of design principles and smells in code. It then discusses refactoring code using patterns like composite and factory method. The case study shows transforming procedural compiler code to use these patterns by treating expression trees as objects. This improves readability and maintains separation of concerns. Examples demonstrate generating code for expressions by traversing the tree rather than conditional logic.
GSP 215 Inspiring Innovation/tutorialrank.com
For more course tutorials visit
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Week 1 HomeworkCommand Line in Windows and Linux
• Using Google, research what kernel operating systems have been used in the video gaming industry. Describe the architecture and details regarding its advantages or disadvantages (i.e, consider Windows, Linux, based, etc.). A minimum of two paragraphs of research information is required, along with your own interpretation of the content.
• Using Google, research the use of parallelism and concurrency in video gaming today. Describe how each
GSP 215 Enhance teaching/tutorialrank.com
For more course tutorials visit
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Week 1 HomeworkCommand Line in Windows and Linux
• Using Google, research what kernel operating systems have been used in the video gaming industry. Describe the architecture and details regarding its advantages or disadvantages (i.e, consider Windows,
Lesson 24. Phantom errors
Potential errors in 64-bit code may occur depending on compiler optimizations and input data sizes. Slight code changes can expose or hide errors, making them difficult to find. Optimizations may use 64-bit registers to avoid overflows, but minor code alterations could cause 32-bit registers and overflows. Therefore, code with potential errors is unstable and hard to test thoroughly.
Arrays and addressing modes
The document discusses various types of operands and addressing modes in x86 assembly language. It describes three basic operand types: immediate, register, and memory. It covers different addressing modes for accessing memory operands, including direct, register indirect, indexed, based, and based-indexed addressing. Examples are provided to illustrate how to copy a string and sum elements of an array using these addressing modes. Key registers used for 32-bit and 16-bit memory addressing are also outlined.
Compiler Construction | Lecture 14 | Interpreters
This document summarizes a lecture on interpreters for programming languages. It discusses how operational semantics can be used to define the meaning of a program through state transitions in an interpreter. It provides examples of defining the semantics of a simple language using DynSem, a domain-specific language for specifying operational semantics. DynSem specifications can be compiled to interpreters that execute programs in the defined language.
NSC #2 - D1 01 - Rolf Rolles - Program synthesis in reverse engineering
The document discusses program synthesis in reverse engineering. It describes using program synthesis techniques to automatically generate CPU emulators by synthesizing descriptions of instruction behaviors from input-output examples of executing the instructions. The key steps involve generating hypotheses about instruction behaviors from templates, sampling instruction behaviors, filtering hypotheses that do not match the samples, and checking equivalence of remaining hypotheses. The goal is to produce a single accurate description of each instruction's behavior.
32 bit and 64 bit Register manipulation
This presentation made by Raheel Niazi (BScs).
Include 32 bit and 64 bit register manipulation in Assembly Language
Design Patterns - Compiler Case Study - Hands-on Examples
This presentation takes a case-study based approach to design patterns. A purposefully simplified example of expression trees is used to explain how different design patterns can be used in practice. Examples are in C#, but is relevant for anyone who is from object oriented background.
f33-ft-computing-lec09-correct.ppt
This document discusses various error correcting codes used in fault-tolerant computing. It begins with an overview of error correction and a multilevel model of impairments. It then provides details on specific codes like Hamming codes, BCH codes, Reed-Solomon codes, and arithmetic codes. Hamming codes can correct single bit errors using parity checks. BCH and Reed-Solomon codes can correct multiple errors using generator polynomials over finite fields. Arithmetic codes represent data as residues to correct errors in arithmetic operations. Overall the document covers the concepts, encoding, decoding, and properties of different error correcting codes.
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Use the following data definitions until notified otherwise Byte1 BYTE 0FFh, 1,2 Byte2
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