x86 assembly tutorial

register the information of these stacks for temporary preservation in the TCB (e.g.).The steps for creating a stack of the X (x=0,1,2) privilege level are as follows:1. Apply for memory, allocate space for stack;2. Create a stack segment descriptor (DPL=X) in the LDT;3. Register the Stack's information in the TCB, including the stack size, base address, selector (rpl=x), and initial value of espx (=0);I think the size of the stack and the registration of the base site is not necessary, because

comparison.So 505 lines should insert a piece of code: pop ecx pop esi pop edi jmp.b;跳转到512行In fact, in these few lines of code, the Register ECX , the ESI EDI value inside is not important.Because in 514 rows, the ECX appropriate value is obtained;In the 512~513 line, the EDI appropriate value will be obtained;In 491 rows, the ESI appropriate value is obtained;So the above patch can be modified to: add esp,12 ;使栈平衡

You can display the time by loading the RTC Interrupt program with the loader of the previous operating system kernel loader (x86 assembler).; user.asm; The header file of the program, the information table of the whole program;--------Header-----------------------------------section header align=16 vstart= 0program_length DD program_endprogram_entry DW start DD section.code.startsection_count DW (sectio N_end-section_begin)/4section_begin:section_cod

X86 assembly language-Summary of learning from the real mode to the protection mode----Blog, http://blog.csdn.net/shunqiziranhao007/article/details/8522424Date, January 1, January 20, 2013---- I learned about the implementation of an operating system and found this book when searching for the protection mode. This book is about to go public recently, the author provides the PDF and other related documents

8086 Register:The concept of a register without an address refers to the memoryData registers:AX (AH AL) accumulatorBX (BH BL) Base RegisterCX (CH CL) Count registerDX (DH DL) data registerSegment Register: (Storage of various segments of the first address)CS Code Snippet registers the first address of the instruction in memory that is currently being processed (Physical address = (csDS Data Segment Register current data in memory of the segment header address (Physical address = (dsES additiona

1. Summarize real mode (16-bit), 16-bit protection mode, 32-bit protection mode in one sentence.16-bit real mode, addressing: Sg+offset (16-bit), segment register +offset is memory address, no segment description table, direct read memory, segment only logical meaning (code snippet?). Data segment? such as16 is the protected mode, addressing the Sg+offset (16-bit), the segment register is the ID of the Segment Description table, the table entry records the true segment address, and whether the s

o'clock transfer; The JE directive means that when the zf= (1) is calculated, the result is 0 o'clock transfer; The JNZ directive means that when the zf= (0) is not transferred when the result of the calculation is not (0); The JNE directive means that when the zf= (0) is not transferred when the result of the calculation is not (0); 2:CMP AX,BXJA LBBJe lbzJB LBLThe 1th Chapter Exercises:Detection Point 12.2: The current stack segment descriptor B bit is 1, the base address is 0x00700000, the

X86 OpenWRT Virtual Machine Compilation Tutorial X86 OpenWRT source code compilation in UBUNTU10-, access to software toolsGet the latest dependency packs for various tool software:sudo apt-get updateCopy the next command directly and perform the installation of all the tool software to be usedsudo apt-get -y install curl wget tree grep gcj texinfo sharutils subv

VirtualBox Security Android-x86 4.0 graphic tutorial Why are Android virtual machines much slower than iOS and WP7 virtual machines? The reason is as follows: 1. the Android Simulator simulates the ARM architecture (arm-eabi), while the target architecture of iOS and WP7 simulators is x86, in addition, the App running in the iOS simulator is also compiled into

[Spring tutorial 8] automatic spring assembly and spring tutorial assembly 1. In spring assembly between us, if a bean uses another bean file, the format should be as follows: That is, when beanA needs to use the accessor to inject B, the above configuration is required.

===========================================================================================Description: For convenience, this tutorial is a related operation under VMware. The virtual machine setup process does not repeat.(Some of the physical machine installed when the NIC driver is not good, you need to compile the driver into the IMG file, is not discussed in this article.) ）Download the Openwrt image fileDownload the official compiled

Win10 assembly environment configuration tutorial, win10 Assembly tutorialSoftware Download The required software includes dosbox and MASM.Install dosbox Install dosbox0.74-win32-installer.exe In the compressed package.Install MASM Place the content in the MASM folder in the compressed package to a folder, and try to path it to D: \ masm. Other paths are also

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 ).

equal to all collections. Ret Finally, the main function ends and the RET instruction exits the program execution.Eight, reference links Introduction to reverse engineering and Assembly, by Youness alaoui:http://kakaroto.homelinux.net/2017/11/ introduction-to-reverse-engineering-and-assembly/ x86 A