As assembly language is closer to the hardware level than C + +, it is often possible to take the form of embedded assembly in C + + code to speed up the program in high performance requirements.In the VC can be simple through__asm{//Add assembly code here}to achieve. The following is a very simple example of the performance gap between Assembly cross-compilation and direct C + + code, with the following code and running results:#include If you are in a complex program, the difference in perform
Starting from the simplest Win32 Assembler, helloworld
Write by nine days Yan Ling (jtianling) -- blog.csdn.net/vagrxie
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Since I started to get plug-ins, my personal goal has been very clear. I took this opportunity to re-learn Win32 compilation. I bought a book and started to learn about it because of the urgency of C ++ learning, I gave up... This is almost the same as the learning process of python in the past .....
This article has been updated. Please refer to the new articleBasic Win32 Assembly knowledge compiled by Jack Http://blog.csdn.net/magus_yang/archive/2007/04/05/1552930.aspx
Title: Jack's first Win32 Assembler helloworldOperator: Jack Yang time: link: >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>>>>>>>>>>>>; part 1: schema and source program format definition statement. 386; instruction set. model flat, stdcall; working mode option Casemap: n
Hello world advanced assembler Series
Title *** Hello, world advanced program selection branch by lluct ***
Data Segment; define data segmentsMsg1 dB '*** welcome to my program by lluct ***', '$'; Defines the first string of the output. The string must be defined in dB, and $ indicates the end mark.Msg2 dB '1: basic message 2: Advanced message', '$'; Define output string information: Select menuMsg3 dB 'Please choose: ',' $'; Define the output string
Hello World This is the first simplest program of every programming language, and the following program is the Hello World of assembly language. To learn to compile for a period of time, until now to record their first compilation program notes. Although this is a fairly simple small program, but this is a beginning, with the beginning, the future of their own notes may be updated more frequently.Assembly (x86)
12345678910111213141516171819
stack segment stack ' stack ' D
analysis, also known as the source program analysis, the analysis process found that there are grammatical errors, give the prompt information.
(4). LINK (LD): GCC will go to the system's default search path "/usr/lib" to find, that is, linked to the Libc.so.6 library function . function library is generally divided into static library and dynamic library two kinds . Static library refers to the compilation of links, the library files of the code are all added to the executable file, so th
I. Call and RET directives Second, in the sub-process, you need to save the value of the register may be modified, here you can use the uses pseudo-directive to generate Compilation example of a city array summation 1TITLEPagera Proc Demo2INCLUDE Irvine32.Inc3 includelib Irvine32.lib4 includelib Kernel32.lib5 includelib User32.lib6 7 8 . Data9 Array DWORD 1000h,2000h,3000h,4000hTen One . Code A - ;--------------------------------------------------- - ; the ;Calcute The sum of an array of 32
The first step:Installing virtual machines 32-bit XP system + RADASM softwareStep Two:Download the relevant source code and library files in the 5th edition of the Intel assembly language Program design http://kipirvine.com/asm/examples/index.htm will download IrvineExamplesVS2008, extract the INC And Lib files are placed in the Radasm directory Note: If the path cannot be found, the compilation error will prompt you,C:\radasm\masm32\bin\ml. exe/c/coff/cp/nologo/i"C:\RadASM\Masm32\Include""tests
Most computers use a 8-bit block (known as Byte byte) as the smallest addressable memory unit, rather than accessing individual bits in memory. The program treats the memory as a very large byte array called the virtual memory (virtural memories). Each byte of the memory is marked by a unique number, called its address, and the set of all possible addresses is called the virtual address space.This virtual address space is just a conceptual image, and the actual implementation is shown in chapter
1. Download and install the MASM, download the Nmake.exe tool, and place the Namake.exe under the bin of the MASM installation directory.2. Write a batch file for setting environment variables Var.bat (put to the MASM root directory) The contents of the file are as follows:@echo offREM Modify the following MASM32DIR environment variables according to the installation directory of the MASM32 software package!Set Masm32dir=d:\masm32Set include=%masm32dir%\include;%include%Set lib=%masm32dir%\lib;%
The following program is available:MOV ah,2MOV dl,13int 21hSee the above program is called the int 21来 output hex 13.So, if the main program calls directly like this:MOV ax,1MOV dx,1The code above callSub ax,1Sub dx,1It can be seen that AX,DX initialization is 1, then although the program can be executed successfully, but to call the sentence below is no longer the value of our main program, because the subroutine is the above output 13 of the code to change the value of ax and DX.Stack is a spe
,%EBX - int$0x80Expected output:Value is:12345678Value is:5678Result output:Value is:12345678Value Is:12At first thought is the 0x12345678 of the highest byte 0x12 transferred to the CX inside, feel quite strange, obviously use is MOVW, to wrong is also 0x1234, analysis, the original is printf mischief, function call, its return value is usually stored in the eax inside to pass, And the first printf output: value is:12345678 has exactly 0x12,18 characters (with ' \ n '), so after the code ex
Using disassembly in the ARM platform to analyze C memory Distribution: arm: Use the arm-linux-objdump command to disassemble the Elf file after the compilation is completed. Then redirect to the Tmp.s file. The first step is the following C file. Vim tmp.c#includeUsing assembler to analyze the memory distribution of C code
Byteplay-Python bytecode Assembler-disassembler-Google Project hosting
Byteplay lets you convert Python code objects into equivalent objects which are easy to play with, and lets you convert those objects back into living Python code objects. it's useful for applying crazy transformations on Python functions, and is also useful in learning Python byte code intricacies. check the documentation to see it in action!
Byteplay was written by Noam yor
enter the values of each element of the array, invoke the assembly code to obtain the maximum value of the and the maximum position in the array */ #include Void Main () { extern found (int i,int*j,int *k,int *s); int i,j,k,s[10]; printf ("Enter Values of array:/n"); for (i=0;i scanf ("%d", s[i]); i=10; found (i,j,k,s); printf ("/nthe max_value is:%d/n", j); printf ("The Place is:%d/n", K); }
2, write the following assembler co
Original address: http://oss.org.cn/kernel-book/ch02/2.6.1.htm
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Comparison of 2.6.1 and Intel assembly language
We know that Linux is a member of the Unix family, and although the history of Linux is not long, many of the things associated with it originate from UNIX. In terms of the 386 assembly language used by Linux, it also originated from UNIX. UNIX was originally developed for PDP-11, and has been ported to the VAX and 68000 series processors, and the assembly language on these
value, not an absolute address, and its
Values are computed by the assembler (relative addressing in the reference addressing method). It is a 24-bit signed number, the left two-bit symbol expands to 32-bit, and the valid offset is 26 bits (the address space of the front and back 32MB). The following directives:# The program unconditionally jumps to the label label to execute
B Label;
When the z-condition code is set in the #当CPSR register, the prog
Tags: generating color oschina alt OSC reg Tree int DebugClick to view CodeAnalysisUse gcc -g example.c -o example -m32 instructions to generate a 32-bit assembly on a 64-bit machine gdb example , and then use the instructions to enter the GDB debugger. After entering, set a breakpoint at the main function, run again, use disassemble the instructions to get the assembly code, and use i(info) r(registers) the instructions to see the values of each register: The stack base of the main
complete. Here is the corresponding tableBottom: 0x0bfffefec stack top: 0x08048413Feelings:In the study of the fourth Chapter P239 page is detailed, this time GDB analysis is to use GDB debugging to consolidate the knowledge learned through this practice, the stack frame grasp has been quite solid, thank Lou Teacher.Problem:When the main function will be assigned to the base site%EBP,%esp immediately reduce the 0x10, which is why, I think about it is not possible to open up variable storage spa
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