Multifile/Linkers/Data sections

Question 1

ELF Data Sections

Answer 1

.text, .rodata, .data, .bss, .symtab, lreltext, .debug, .strtab

Question 2

.text

Answer 2

Machine code

Question 3

.rodata

Answer 3

String literals, switch/jump table

Question 4

.data

Answer 4

initialized globals and static locals

Question 5

.bss

Answer 5

uninitialized globals and static locals

Question 6

.symtab

Answer 6

linker symbol table

Question 7

.reltext

Answer 7

relocated code

Question 8

.debug

Answer 8

complete symbol table

Question 9

-fno-common

Answer 9

prevents weak name conflicts from compiling

Question 10

.strtab

Answer 10

NULL-terminated strings of names of symbols in .symtab section

Question 11

(Linker stage) Resolution

Answer 11

Check to make sure each symbol has one def only

Question 12

(Linker stage) Relocation

Answer 12

Resolve symbol addresses for aggregated sections of of executable

Question 13

Object Files (ROFs)

Answer 13

Produced by assembler, can be combined by linker

Question 14

(Multifile coding) Include Guard

Answer 14

Prevents multiple inclusions

Question 15

(ELF_Symbols) int name

Answer 15

byte offset in .strtab where name is found

Question 16

(ELF_Symbols) int value

Answer 16

Symbol addr

Question 17

(ELF_Symbols) int size

Answer 17

size in bytes

Question 18

(ELF_Symbols) char type

Answer 18

indicates type e.g Data means object, func means function

Question 19

(ELF_Symbols) char binding

Answer 19

indicates scope

Question 20

(ELF_Symbols) char section

Answer 20

indicates location, e.g. .text, .rodata, .data, .bss

Question 21

(Pseudo Sections) ABS

Answer 21

ABSolute, symbols that should not be relocated

Question 22

(Pseudo Sections) UND

Answer 22

UNDefined, symbols in this ROF defined elsewhere

Question 23

(Pseudo Sections) COM

Answer 23

COMmon, symbols in .bss which have not been allocated.

• int value = alignment requirements
• int size = minimum size

Question 24

(Needs Symbol?) static locals

Answer 24

YES

Question 25

(Needs Symbol?) locals

Answer 25

NO

Question 26

(Needs Symbol?) params

Answer 26

NO

Question 27

(Needs Symbol?) global vars

Answer 27

YES

Question 28

(Needs Symbol?) static globals

Answer 28

YES

Question 29

(Needs Symbol?) extern vars

Answer 29

YES

Question 30

(Needs Symbol?) externally defined functions

Answer 30

YES

Question 31

(Needs Symbol?) static functions

Answer 31

NO

Question 32

(Needs Symbol?) non-static functions

Answer 32

YES

Question 33

(Compiler or Linker) local vars

Answer 33

Compiler

Question 34

(Compiler or Linker) static locals

Answer 34

Kind of both

Question 35

(Compiler or Linker) globals

Answer 35

Linker