Assignment  2  (Marks 10)

•    Date of assignment out: 27.07.2006 
  

•    Last date of report: 13.08.2006

•    Compile the following C program with -c option in SunFire (10.5.18.61 or 10.5.18.62)

                           gcc -Wall -O0  -c what.c
      
             You get the relocatable file (object module)  what.o.  Use the file command to see its type -  

                            file what.o

•    Use  ELF Manual  for the denotation of different portions  of the  binary file  what.o. The structure of different  
  

              sections are also available in /usr/include/sys/elf.h  and in /usr/include/sys/elf_SPARC.h on SunFire.

•     Use the command
  

                            elfdump -s what.o   
                      
                 it shows the content of the symbol table of the ELF object module.

•     Write a C program that  reads an ELF object module and prints the following information from the symbol table

                (.symtab).

1. Total number of entries in the symbol table
   
2. Symbol name e.g. data1, merge etc.
   
3. Type of the symbol e.g. function, object etc.
4. Binding of a symbol - local or global
   
5. Size for a function and also for an object                             
   

             You are not suppose to use elfdump or such system utility          

•       A sample C program, object module and partially commented byte dump is shown:  merge.c    merge.o    
  

                      merge.o.dump   Lecture II (ps) (pdf)

•      The file name of the C program should be <rollNo>_02.c, it should contain your identity e.g name, roll number, assignment number etc.

•       Create a subdirectory under your home directory with the name <roll_number>.oslab e.g. 04cs1048.oslab with the protection bits set properly. Assignment with proper name should be available under this directory on or before the last date of report.