Linking Cont.

Question 1

The ____, copies the code and data in the executable file prog into memory, then transfers control to the beginning of the program

Answer 1

Loader

Question 2

_____ _____ take as inpout a collection of relocatable object files and command-line arguments and generate as output a fully linked executable object file that can be loaded and run. The input relocatable object file consists of various code and data sections, were each section is a contiguous sequence of bytes. Instructions are in on section, initialized global variables in other, initialized variables are in yet another section

Answer 2

Static linkers

Question 3

To build and executable, the linker must perform two main tasks:

Answer 3

1. Symbol resolution
2. Relocation

Question 4

The purpose of _______is to associate each symbol references with exactly once symbol definition

Answer 4

Symbol resolution

Question 5

Compilers and assembler generate code and data section that start at address 0. The linker relocates these sections by associating a memory location with each symbol definition, and then modifying all the references to those symbols sot that they point to this memory location.

Answer 5

Relocation

Question 6

Object files come in three forms

Answer 6

1. Relocatable object file
2. Executable object file
3. Shared object file

Question 7

Contains binary code and data in a form that can be combined with other relocatable object files at compile time to create an executable object file

Answer 7

Relocatable object file

Question 8

Contains binary code and data that can be coped directly into memory and executed

Answer 8

Executable objet file

Question 9

A special type of relocatable object file that can be loaded int memory and linked dynamically, at either load time or run time

Answer 9

Shared object file

Question 10

The ____ header begin with a 16 byte sequence that describes the word size and byte order of the system that generated the file

Answer 10

ELF

Question 11

Sandwiched between the ELF header and the section header table are the _____ themselves

Answer 11

Sections

Question 12

The machine code of compiled program

Answer 12

.text

Question 13

The read only data such as format string in print statement and jump tables for switch statements

Answer 13

.rodata

Question 14

Initialize global and static C variables. Local c variables are maintained at run time on the stack and do not appear in the .data or .bss sections

Answer 14

.data

Question 15

Unitiliaze global and static C variables along with any global or static variables that are initialized to 0

Answer 15

.bss