using nasm

moveax4 ;system call Number (Sys_write) movEbx1 ;First Argument:file handle (stdout) movEcx,msg;second argument:pointer to message to write movEdx,len;Third Argument:message length int0x80;Call kernel;and exit moveax1 ;system call Number (Sys_exit) XOREbx,ebx;First syscall argument:exit code int0x80;Call kernel4. Compile the connection#nasm-F elf64 hello.asm (Linux is 64-bit, if 32, use ELF32)#ld-

the past, the author liked the NASM to program when it was necessary to use x86 's 16-bit real mode. For example, "30 days of homemade operating system", "Orange's an operating system implementation", "x86 assembly language-the actual mode to protect mode" and other books are the NASM assembler and Intel assembly syntax as an example. And they are all in the 32-bit protection mode before the assembly langu

jumps to the OS core code for execution.The startup code is compiled by assembly and NASM, And the OS core code is implemented by Delphi. Step 1: Generate startup codeThe main function of starting code is to build gdt (including code segments and data segments, flat memory settings), read the kernel code to 0x8000, switch to the protection mode, and jump to the kernel. The content is as follows: [Bits 16][Org 0x7c00] JMP bootbegin ; Gdt dataGdtbegin:

From//http://blog.chedushi.com/archives/6532?utm_source=tuicool Using Nginx to build a streaming media server with HTTP and rtmp protocols Experimental Purpose: Allows Nginx to support FLV and MP4 format files while supporting RTMP protocol while opening the HLS function of rtmp Information: HTTP Live Streaming (abbreviated as HLS) is an HTTP-based streaming network Transfer protocol proposed by Apple. HLS only requests basic HTTP messages, and unli

When using a variety of powerful free software, I always have reverence for its developers and hope that they will become one of them one day. Many people who are eager for a free community want to embrace it, but do not know how to do it. Then, start with writing a simple operating system! What we want to do Some people may worry that they have neither learned computer principles nor operating system principles, but do not understand assembly languag

One, using nodes to implement the linked list LinkedList, without changing the JAVAAPI set frameImport Java.util.scanner;public class Main {public static class Node {int data; Node Next=null; public Node (int data) {this.data=data;}; } public static class Mylinkedlist {Node head=null; Public mylinkedlist () {}//Add node public void AddNode (int d) {node newnode=new node (d); if (head==null) {head=newnode; return; } Node Tmp=h

The difference between using index and using where using index in the MySQL execution plan extra is as follows: Source: http://www.cnblogs.com/wy123/p/7366486.html(The Source retained is not the right of original works. My work is far from reaching this level, just to link to the original article, because some possible errors will be corrected or supplemented la

In php programming, the difference between using commas for echo and using dots is that using commas for echo The echo string is better than the. Connection. The reason is not mentioned. Let's take a look at the following two sentences: What is the result? 1+5=6？1+5=6？——————6？2？——————6.6？6.6？—————— I can only say echo '5 + 1 = '. 1 + 5; the result is 10, so the

[Valid Java] 6. Using Compound takes precedence over using inheritance, while using tivejava This is what any book will say, because we often don't need to inherit, but just want to extend the class, and we want to extend the attributes or classes corresponding to the methods, at this time, if the relationship between the two is a, this relationship does exist, y

address of the string is stored in, ECX, the last edx store null, then use 0X80 to trigger the system call, no accident, A rebound link instruction was executed successfully. In this example, the IP address uses the 127.127.127.127 port number of 9999, which is a local IP address. UsuallyYou need to use an external IP to replace it, if the two IP length is different, you have to carefully modify all the assembly code associated with him.0x03 Compiling test Shellcode Now, we need to store

First, using the For loop structureTarget:This case requires writing a shell script chkhosts.sh that uses a for loop to detect the surviving status of multiple hosts, with the following requirements and instructions:1> Ping Detection of 192.168.4.0/24 network segments2> Ping Detection can refer to the pinghost.sh script of the preceding dayThe 3> script can traverse the ping hosts and feed back the surviving statusAfter the test script is executed, th

1 Introduction Libjpeg a picture decoding library, in the project need to read into the picture, but do not want to rely on OPENCV interface, this can libjpeg complete decoding. Libjpeg has two versions, one of the original Libjpeg, the other is Libjpeg-turbo, which is a decoding library using SIMD instruction acceleration, about 3 times times the speed of Libjpeg, code see https://github.com/ Libjpeg-turbo/libjpeg-turbo 2 compile download source cod

Record thisArticleThe source of inspiration comes from a small debate with my colleagues before I leave work today. In a project I have developedCode: Public String toxml () {string strxml = string. empty; try {memorystream MS = new memorystream (); xmlserializer xml = new xmlserializer (this. getType (); XML. serialize (MS, this); byte [] arr = Ms. toarray (); strxml = encoding. utf8.getstring (ARR, 0, arr. length); Return strxml;} catch {return "";}} My colleagues said that resources such

Using statement The Using statement obtains one or more resources, executes a statement, and then disposes of the resource. A using statement is translated into three parts: acquisition, usage, and disposal. Example: Using (font font1 = new font ("Arial", 10.0f )){} ( Note: It's different from a direct block wrapping:

SummaryThe previous article described the installation of the Redis client and server side, as well as a general introduction to Redis. This article focuses on explaining. NET4.0 and. How to manipulate a hash table using Redis and C # Redis in NET4.5. And some code from the package will be pasted. In the course of the explanation, I intend to combine the Redis operation command with the description, as a comparison. This also gives the reader a clear

These days friends and classmates say he encountered a problem when COM invoked the WCF service using service tokens, that is, the SOAP message he returned was greater than the default value of the Wshttpbinding of 65536, raising the call error. You need to change the maxreceivedmessagesize to a value that can hold large message content. The default wshttpbinding is used in the previous three articles, so there is no such problem. Now you need to chan

Writing and using static library of Win32 programming. How to write and use a dynamic link library what is a static library. What is a dynamic link library.Static libraries are a solution to the development of modules. In the past, when we write code. Everyone can write a project on their own. But not now. A project often needs to be written by many people. And the techniques used are similar to static libraries.Everyone writes their own stuff. The la

Label:CentOS6.7 using a non-root user (normal user) compile and install the MySQL database and implement the MySQL database service random auto-start using the Shell Script timed task mode1. About MySQL?MySQL is a relational database management system developed by the Swedish MySQL AB company, currently owned by Oracle Corporation. MySQL is an associated database management system that keeps data in separat

Writing and using static library of Win32 programming. How to write and use a dynamic link library what is a static library. What is a dynamic link library. Static libraries are a solution to the development of modules. In the past, when we write code. Everyone can write a project on their own. But not now. A project often needs to be written by many people. And the techniques used are similar to static libraries. Everyone writes their own stuff. The

Tags: style blog http io color ar using for SPExt.: http://wudataoge.blog.163.com/blog/static/80073886200961652022389/A Meaning of with ASThe with as phrase, also called the subquery section (subquery factoring), allows you to do many things, defining a SQL fragment that will be used by the entire SQL statement. Sometimes it is to make the SQL statement more readable, or it may be in different parts of union all as part of providing data.Especially us