nasm assembly language tutorial

In assembly language learning to find a good entry tutorial, so excerpt some of the more important points 1. An assembler language program can be divided into 3 parts: 1. Data area Used to define initialization variables (but the variables defined here are not allowed to change during program execution, so they are "

starting position of the video memory (also mentioned later) mov ds, ax mov byte [0x00], ' H '; print Hello world! mov byte [0x01],0x07 mov byte [0x02], ' e ' mov byte [0x01],0x07 mov byte [0x04], ' l ' mov byte [0x01],0x07 mov byte [0x06], ' l ' mov byte [0x01],0x07 mov byte [0x08], ' o ' mov byte [0x01],0x07 mov byte [0x0C], ' W ' mov byte [0x01],0x07 mov byte [0x0E], ' o ' mov byte [0x01],0x07 mov byte [0x10], ' R ' mov byte [0x01],0x07 mov byte [0x12], ' l ' mov byte [0x01],0x07 mov byte

For beginners, the compilation of many commands is too complex, often learning for a long time can not write a beautiful program, so as to hinder our interest in learning compilation, many people give up. Therefore, I personally read the legal compilation, but I don't have to write a program. Writing a program is really not a compilation strength. You may wish to play debug, sometimes crack has a more sense of accomplishment than a program (just like learning to play games first on a computer ).

completion of a program more sense of accomplishment (like learning computer first play game). Some of the advanced instructions are actually useful only to experienced assembler programmers, which is far too advanced for us. In order to get a good start in language learning, you must first rule out the ornate and complex commands and focus on the most important commands (CMP LOOP MOV jnz ...). ）。 But want to in the bar in the textbook to complete th

strong sense of excitement-#% % "Wake up!" For beginners, the compilation of many commands is too complex, often learning for a long time can not write a beautiful program, so as to hinder our interest in learning compilation, many people give up. Therefore, I personally read the legal compilation, but I don't have to write a program. Writing a program is really not a compilation strength. You may wish to play debug, sometimes crack has a more sense of accomplishment than a program (just like

For beginners, the compilation of many commands is too complex, often learning for a long time can not write a beautiful program, so as to hinder our interest in learning compilation, many people give up. Therefore, I personally read the legal compilation, but I don't have to write a program. Writing a program is really not a compilation strength. You may wish to play debug, sometimes crack has a more sense of accomplishment than a program (just like learning to play games first on a computer ).

Therefore, I personally read the legal compilation, but I don't have to write a program. Writing a program is really not a compilation strength. You may wish to play DEBUG, sometimes CRACK has a more sense of accomplishment than a program (just like learning to play games first on a computer ). Some advanced commands are actually only useful to experienced assembler programmers. They are too advanced for us. To make learning assembly

2018-02-10 Nanyi 21CTO Learning programming is to learn high-level language, that is, those designed for human computer language.However, the computer does not understand the high-level language and must be translated into binary code by the compiler before it can be run. Learning a high-level language does not mean understanding the actual running steps of a com

is not difficult to see that the U command includes three parts to the left of the memory address, followed by the machine code the rightmost machine code corresponding assembly instructions. To execute the command we wrote, we should use the command T to see the value of the current register: The current CS and IP values are: cs=1442 ip=0100 to make the computer perform the 1000:0 command we wrote, we need to change the current CS and IP to cs=1000

Interrupt Descriptor Descriptor Register instruction: SIDT DSTSimilar to "Sgdt DST".b) Storage machine status word directive: SMSW DSTDST can be a 16-bit universal register or storage unit. No effect on the flag bit.Note: In order to be compatible with the 80286 instruction set (386 CR0 low byte equals 286 machine state word), in 386, the storage machine word should use the stored CR0 Register instruction.2) Real mode and privilege level 0 executable commandsKey register settings directives, et

The recommended star rating for this book is: 5 stars. After all, it is a classic book, Nothing to say.As far as the Assembly itself is concerned, the preparation of high-efficiency programs and the optimization, commissioning, and reverse engineering of the project is a foundation; in terms of the theoretical operating system, the assembly lets you understand the CPU, understand the architecture of the com

platform. In general, a well-functioning compiler should be very convenient, for example, should be able to automatically organize the format, syntax highlighting, set compilation, linking and debugging as a whole, convenient and practical. For the widely used personal computer, can freely choose the assembly language compiler has MASM, NASM, tasm, Gas, FASM, ra

, I believe that will be harvested. NASM the link that generates obj can use ALink. 3.FASM FASM (flat assembler) is a purely in assembly language, and the use of the development of the technology of the compiler, FASM the biggest advantage is that no additional link steps to generate the executable file directly, there is no trivial pseudo command, So the writte

" any register "Q" registers eax, ebx, ecx, and edx "I", "h" direct operand "E" and "F" Floating Point Numbers "G" arbitrary "A", "B", "c", and "d" indicate the registers eax, ebx, ecx, and edx respectively. "S" and "D" registers esi, edi "I" constant (0 to 31) VIII. Summary The Linux operating system is written in C language. Compilation is only thought of when necessary, but it is a very important way to reduce the code size and optim

!) Tutorial. Without saying anything, read this article, and you can "inadvertently" sell debug in your predecessors or later generations. It's a great sense of accomplishment. Try it! So what about next? -Here we go! (It doesn't matter if you don't understand it when you read it. It must be broken down in the following sections.) Because assembly is used to communicate with hardware through CPU and memory

Program loading and Execution (vi)--"x86 assembly language: From the actual mode to the protection mode" Reading notes 26What can I learn from this article? Glossary of conditions for NASM When compiling with NASM, define macros with command-line options Conditional statements for Makefile overridi

*strhello = "Hello,world!\n"; void print_helloworld () { printf ("%s",strhello); } int main () { print_two_hello_world(); return 0; } First look at the NASM code, first import an external function print_helloworld (), this function is a C language definition of a function. The next step is to define a function Print_two_hello_world, which is exported with the Global k

standard linking program, which is also included in the binutils package. After compilation and generation of the target code through GAS or NASM, the assembler can use ld to link it to an executable program: [Xiaowp @ gary code] $ ld-s-o hello. o 3. Debugger Some people say that the program is not compiled but called out. It shows that debugging plays an important role in software development, especially when programming in

table, a parameter table, and so on) nasm-f elf-o foo.o foo.asm generates FOO.O ( is an intermediate file, not an executable file, Now that you have generated the. O Intermediate file in the same format, the LD linker can link two intermediate files into a binary executable, and the ld the main task is to BAR.O The function symbol for the reciprocal reference in FOO.O relative address (relative addresses are converted to absolute ad

pointing to an entry for the user symbol table. The red code is to print the two entries to the screen, the user symbol on the left, and the kernel symbol on the right.put_usr_saltthe code for the procedure is as follows:输入：push 属性 es:ebx 中是符号的起始地址输出：无 -Put_usr_salt:; Print user's symbols $ PushEcx the movEbp,esp the movch,[ebp+3*4] the . Getc:; local label the movCL,[ES:EBX] - orCl,cl inJz. out the PagerPut_char the IncEbx