Computer Systems: A Programmer's Perspective Plus Mastering Engineering With Pearson Etext -- Access Card Package (3rd Edition)
Computer Systems: A Programmer's Perspective Plus Mastering Engineering With Pearson Etext -- Access Card Package (3rd Edition)
3rd Edition
ISBN: 9780134123837
Author: Randal E. Bryant, David R. O'Hallaron
Publisher: PEARSON
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Chapter 7.5, Problem 7.1PP
Program Plan Intro

Sections in relocatable object files:

There are many sections in a relocatable object file. They are given below:

  • “.text”:
    • It is the machine code of the compiled program.
  • “.rodata”:
    • This section is used to read only the data in the format such as
      • Strings in “printf” statements.
      • Jump tables for switch statements.
  • “.data”:
    • This section is used in the initialized “C” variables of global variable and static “C” variables.
    • Local “C” variables are initialized at execution time on the stack.
      • It does not show in either the “.data” or “.bss” sections.
  • “.bss”:
    • It is used in the uninitialized global and static “C” variables, along with any global or static variables that are assigned to zero.
  • “.symtab”:
    • It is a symbol table.
    • It contains the information about functions and global variables that are defined and referenced in the program.
  • “.rel.text”:
    • This section contains a list of locations in the “.text” section.
      • It will require to be changed once the linker merges this object file with others.
  • “.rel.data”:
    • This section contains relocation information for any global variables that are referenced or defined by the module.
  • “.debug”:
    • It is a symbol table for debugging
    • It contains entries for following
      • Definition of Local variables, global variables and typedefs variables and original “C” source file.
  • “.line”:
    • It is a mapping between line numbers in the given program
      • That is in original “C” source program and machine code instructions in the “.text” section.
  • “.strtab”:
    • It is a string table.
      • It contains symbol tables in the “.symtab” and “.debug” sections.
      • It is the table for section names in the section headers.

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