Text and idata segments may be write protected bss

Info icon This preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: d wdata sections. Text and idata segments may be write-protected. BSS “Block Started by Symbol” (uninitialized global data) e.g., heap and sbuf go here. header text text idata data wdata text data BSS program program user stack args/env kernel process VAS Process stack and BSS (e.g., heap) segment(s) are zero-filled. segments Process Process BSS segment may be expanded at runtime with a system call (e.g., Unix sbrk) called by the heap manager routines. Args/env strings copied in in by kernel when the process is created. Virtual Virtual Addressing virtual memory (big) User processes address memory through virtual addresses addresses. 0 The kernel and the machine machine collude to translate virtual addresses to physical addresses. physical memory (small) text data BSS user stack args/env kernel virtual-to-physical translations The The specific mechanisms for memory management and address translation are machine-dependent. Processes Processes in Unix The Unix system call for process creation is called f...
View Full Document

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern