https://dustin.schultz.io/how-is-glibc-loaded-at-runtime.html Position Independent Code (PIC) in shared libraries PIC(位置无关代码) 通过GDB 调试理解 GOT/PLT 7.12 位置无关代码 - 深入理解计算机系统(CSAPP) 浅析动态链接中GOT与PLT的工作方式 吴章金: 深度剖析 Linux共享库的“位置无关”实现原理 ...
在GCC编译器中, -fPIC 参数是指生成位置无关代码(Position Independent Code,PIC)。位置无关代码是一种可在内存中的任何位置加载和执行的代码。它通常用于动态链接库(shared library)的编译。 使用-fPIC 参数编译代码时,生成的目标文件中的代码和数据引用都使用相对地址,而不是绝对地址。这样,当目标文件被加载到内...
模块间的数据访问目的地址要等到装载时才能确定,ELF文件的做法是在数据段里面建一个指向这些模块间全局变量的指针数组,也被称为全局偏移表(Global Offset Table, GOT),当代码需要引用模块间全局变量时,可以通过GOT中的表项间接的引用。由于GOT是存放在数据段中,所以动态库在装载时可以被修改,每个进程都有独立的副本...
Position-independent code (PIC) is code that can execute regardless of its absolute address (i.e. by using relative addressing). PIC is used forshared libraries, allowing library code to be located anywhere in memory. To access this content, you must purchase a Membership -check out the diff...
position-independent code (pic) There is a significant runtime cost for position-independent code when using dynamic linking (shared objects) in Linux, BSD and Mac systems. Critical CPU-intensive code should never be stored in a shared object on these systems....
Function calls in PIC Alright, so this is how data addressing works in position independent code. But what about function calls? Theoretically, the exact same approach could work for function calls as well. Instead of call But this is not ...
E原文地址:http://eli.thegreenplace.net/2011/11/11/position-independent-code-pic-in-shared-libraries-on-x64/ The previous articleexplained how position independent code (PIC) works, with code compiled for the x86 architecture as an example. I promised to cover PIC on x64[1]in a separate ...
My Goal is to now activate Position Independent Code This is what I did. Activate -fPIC in the compiler settings. Change the Interrupt Table starting address in the .ld file since PIC is now active. Add the Global Offset Section (got, plt) manually because the compiler re...
non-pic会使用位置独立的代码构建PHP并能提供10%的性能提升。 www.ibm.com 2. Ifyou're an avid ASM coder,manythingsaremorestraightforwardsinceyoucantakecaretoproduceposition-independentcode. 假如你想用汇编,很多事情看来可能更直接,因为你要侧重编写自由定位的代码。
Portable Position-Independent Code (PIC) bootloader and firmware for ARM Cortex-M0 and Cortex-M4 – J... In particular, the compiler flags: -msingle-pic-base -mpic-register=r9 -mno-pic-data-is-text-relative -fPIC seem to be the magic flags to get things to work. ...