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Linux Kernel series-11. ELF format for operating system development, linuxelf Shows the structure of the ELF file: The ELF File consists of four parts: ELF header, Program header table, Section (Sections), and Section header table ). In fact, a file does not necessarily contain all this content, and their locations ma

To keep it concise, this article does not describe some details, such as weak variables and got.This document assumes that the reader understands the ELF file format. The code is included in the attachment.If the Forum does not support attachments, you can send an email to me.1. Loading elf filesIn the ELF File, use the section and program structures to describe

ELF strong sign and weak sign (this section is for others) We often encounter a situation in programming that is called a symbol repetition definition. Multiple destination files contain definitions of the same name global symbol, then the target file link will appear when the symbol is repeatedly defined error. For example, we have defined a global reshaping variable global for both target file A and target file B, and have initialized all of them,

Document directory 1. ELF File Header Link Program Find and link all referenced external modules. These external modules or function libraries generally come from developers, operating systems, and C Runtime libraries. The link program extracts these function libraries, modifies the pointer position (relocate), and cross-references the symbol parsing in the module to generate an executable module. The symbol can be global or local. Global symbols

ELF magic number parsing in Linux: in Linux, we can usually use the readelf command to view ELF File Information. For example, the www.2cto.com ELF file contains 32-bit and 64-bit versions. The structure information of the 32-bit version is as follows: The above structure basically corresponds to the elf information of

Inspired by "Csapp" P453, want to actually look at the content of the elf file, so do a simple attempt, hope worthwhile.The program that is used for demo is:Swap.cextern int Buf[];int *bufp0 = buf[0];int *bufp1;void swap () { int temp; BUFP1 = buf[1]; temp = *bufp0; *bufp0 = *BUFP1; *BUFP1 = temp;}Main.c#include The following command readelf commands to explore the elf interior. ?Can see some

ArticleDirectory Introduction Solution: SOF + elf> flash> hex> JIC Reference Introduction After downloading the flash programmer by using the niosii flash programmer, the problem that the program cannot be started from the new source is concentrated in the following versions: 9.0sp2 9.1, 9.1sp2 11.0 Basically, there are bugs in these series FLASH leader versions. Among them, 11.0 cannot be erased when the JIC is

Many users will be 360 security guards set to open the start, so every time the boot, there will be a 360 security defender of the cartoon characters in the computer screen, the cartoon task is called: 360 security guard on Elf, in addition to the lovely appearance, Through Andy Elf can also directly call some of the 360 security guard functions, such as settings, timing shutdown. However, the recent user t

The generic Elf file consists of three index tables: Elf Header,program header table,section Header table.1 ELF Header: At the beginning of the file, a roadmap was saved, describing the organization of the file.2 Program Header table: Tells the system how to create a process image. The target file used to construct the process image must have the Program Header t

problem that I'm struggling with:Installation of arm-elf-gdb ....The installation process is as follows:Http://blog.chinaunix.net/uid-15007890-id-2377453.htmlDownload GDB installation package: ftp://ftp.gnu.org/gnu/gdb/Tar jxvf gdb-7.0.tar.bz2CD gdb-7.0mkdir Build-gdbCD Build-gdb.. /configure--target=arm-elfMakeMake installWhere you should encounter GCC compilation all warning have followed the make error of errorThis is because the current version o

debug. Want to see where in the end is not normal execution.And that raises the question that I have to struggle with:Installation of Arm-elf-gdb.。。。The installation process is this:Http://blog.chinaunix.net/uid-15007890-id-2377453.htmlDownload GDB installation package: ftp://ftp.gnu.org/gnu/gdb/Tar jxvf gdb-7.0.tar.bz2CD gdb-7.0mkdir Build-gdbCD Build-gdb.. /configure--target=arm-elfMakeMake installYou should encounter GCC compile all warning to mak

Android is built on Linux, and its underlying code is assembled by installing the Linux executable file--elf format. This article combined with the so file in Android to understand the elf format, most of the data collected online, elf format is located in Android Source: Elf.h.elf can be broadly divided into three parts: Elf