x86 tablet linux

Using QT to detect USB flash drive plugging, the idea is to use qt's q6. messages can receive messages from Hal or udisks. These two methods are feasible on the X86 platform, but it won't work on the board. There may not be Hal in the Board, but Hal has to transplant some online materials to the board. Udisk does not have any transplanted data. Even worse, whatever Hal or udisks, the messages they receive are all sent by udev. Udev requires the suppor

Exploring the principles of coredump: virtual functions and virtual functions in Section 6.4 of Linux x86 In the previous section, we have explored the arrangement of class member variables. Now let's take a look at the arrangement of virtual function tables and member variables and the arrangement between virtual functions. Let's take a look at an example: 1 #include Assembly code: (gdb) disassemble

Exploring coredump principles: set object in section 7.7 of Linux x86, linuxcoredump Let's take a look at bits/stl_map and bits/stl_set. We can see that map and set are defined as follows: 84 template 85 template Because map and set are defined to declare any member variables, all member variables are inherited from _ Rb_tree. The only difference is that the last Parameter definition of _ Rb_tre

This section, look at the layout of the iterator object in memory in the list1 #include Look at the assembly of the Getsum function:(GDB) disassemble getsumdump of assembler code for function _Z6GETSUMRST4LISTIISAIIEE:0X080486CD You can see the this pointer of the list in the ebp+0x8,iter of the this pointer in ebp-0x18.At the 0x0804874b command address break point.Look at the contents of the list:(GDB) x $ebp +0x80xbffff5a0:0xbffff5b8 (gdb) x/8x 0xbffff5b80xbffff5b8:0 x0804b0080x0804b0f80x08048

Ebp Stack data pointer Segment Register and its description: cs code snippet ds data segment ss stack segment es additional segment pointer fs additional segment pointer Gs Additional segment pointers The processor flag determines whether each operation implemented by the processor is successful.

beyond the length of the data are first stored in the carry flag and discarded during the next shift operation. Shift Right Command: SHR and SARThe shr shifts the unsigned integer, and the empty space generated by the right shift is filled with 0. The SAR command determines the number of padding for the position generated by the shift based on the integer sign bit, the negative vacancy fills 1, and the positive vacancy is 0. the right shift out of the data element is first moved to the carry fl

:0xbffff24c0x0804b0180x123456780x000000110x804b018:0x0804b0080xbffff24c0xabcdef010x00020fe1This is represented by a graphic (representing only the first member).If you look at the second member of these three addresses, you will become such a graphicThe same observation of the second push_back, and the reference to the list of code, you will get this conclusion.1. List has two members, the first member points to the head of the list, the second member points to the tail of the list2. Each node o

linker populates the table during the redirection process. In this case, you only need to modify the data segment when redirecting, without affecting the text segmentThe dynamic linker uses the following two ways of redirecting global symbols and functionsGlobal offset Table (GOT): The Global offset table contains four-byte entries for each global variable, and the four bytes contain the address of the global variable. When a code snippet's instruction refers to a global variable, it does not u

vector vary. The first member is changed from 0x0804b008 to 0x0804b018, but the contents of the first member point to the address are the same, or 0xffeeffab, and the neighboring unit is 0xabcdef01. Same as the value of the second vector. The second member differs from the first member by 8 bytes, which is exactly 2 int bytes, and the vector has exactly the same 2 members.Take a look at the third push_back:(GDB) Ccontinuing.breakpoint 5, 0x080486fa in Main () (GDB) x/4x $esp +0x180xbffff248:0 X

table Pointer 0x80487c8 is the virtual function table of class xuzhina_dump_c06_s4_derived, or the virtual function table of base class Xuzhina_dump_c06_s4_base?Before answering these two questions, take a look at the constructor of the base class Xuzhina_dump_c06_s4_base:(GDB) disassemble _zn24xuzhina_dump_c06_s4_basec2evdump of assembler code for function _zn24xuzhina_dump_c06_s4_ Basec2ev: 0x0804860a From the constructor of the base class, the answers to the above two questions are as foll

that a class member function can invoke a class member variable directly, because the first argument can be used as a base address to access the variable.You can look at the assembly of the print function for class Xuzhina_dump_c06_s2:(gdb) Shell c++filt _zn19xuzhina_dump_c06_s25printevxuzhina_dump_c06_s2::p rint () (GDB) Disassemble _zn19xuzhina_dump _c06_s25printevdump of assembler code for function _ZN19XUZHINA_DUMP_C06_S25PRINTEV:0X080485DE As you can see, the class member function and the

0X080486DF It is known that the first parameter of the class XUZHINA_DUMP_C06_S2_EX constructor is passed in by the second parameter of the main function, argv[1]. Take a look at argv[1] how much(GDB) x $ebp +0xc0xbfe096e4: 0xbfe09774 (GDB) x 0xbfe09774+40xbfe09778: 0xbfe0a6a3 (GDB) x/s 0XBFE0A6A30XBFE0A6A3: "Thisisaworldfullofdevilnoonecansurvie"The string parsed above is exactly the same. That is, due to improper use of strcpy, resulting in the rewriting of PTR, resulting in co

pointer.Take a look at these instructions:0x0804858b Because it is a sequential structure, we know that these three directives correspond exactly test->inc (); test->inc (); test->print ();Analyze the third paragraph of the Assembly: 0X080485AD The visible eax is just a pointer to the virtual function of the print. And this pointer is finally made by esp+0x1c. By 0X080485AD It is true that the first member of the this pointer is taken out, that is, the member is a vi

is the starting point for all processes in the Linux system, and after the kernel is booted, the INIT process is loaded and its process number is 1. After the init process starts, the operating system is initialized and the Autorun program is started at a specific runlevel (Runlevel). Users can customize the services that need to run automatically at system startup by changing the relevant profile or by using the Graphical Configuration tool service

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Stack Overflow online already has a lot of examples, but rarely involved in the 64-bit and operating system Linux-related, and recently just good enough to study this, so write a series of blog posts, one to help their memories, and also for more people to explore each other.RegisterThe X86-64 has 16 64-bit registers, respectively:%rax,%rbx,%rcx,%rdx,%esi,%edi,%rbp,%rsp,%r8,%r9,%r10,%r11,%r12,%r13,%r14,%r15

can be bitwise OR, for example: Sdl_init (sdl_init_video| Sdl_init_audio);after initializing the SDL library, you also need to set up the video mode by calling Sdl_setvideomode () to complete:sdl_surface *screen;Screen=sdl_etvideomode (640,480,16,sdl_swsurface);/*640 x 480 x 16-bit color */sdl_surface is defined in Sdl_video.h, which is a drawing plane in which all the drawing operations are done. Automatically processed by SDL when exiting graphics mode. Release to display when not required: s

1. The overall process of booting from boot to start_kernel underX86 architectureA brief overview of this process is:Boot-->bios-->grub/lilo-->linux KernelIts running flowchart and important functions are as follows: 2, load the Linux Kernel (based on X86) memory layout map| |0a0000 +--------------------------+| Reserved for BIOS |Do not use. Reserved for BIOS Eb

code specified for the ASM segment. the ANSI C specification uses the keyword __asm__ to replace the keyword ASM when using inline assembly statements, because the ANSI C keyword ASM is used for other purposes. as follows: __asm__ ("Addl $, result\n\t" "Subl $, result\n\t");The Basic ASM format provides a simple style for creating assembly code, but there are some limitations. First, all input and output values must use the global variables of the C program, as seen in the example abo

same time, the PC completes the automatic addition of one operation, forming the address of the next operation instruction, that is, address No. 1th. Second instruction: With the first instruction, the PC sends the second instruction address to mar, commands the memory to do the reading operation, sends the 1th unit content to the MDR, also has the MDR sends to the IR, then the CU analyzes the operation code, if is the multiplication instruction, the CU sends the reading command to the memor