Quiz 2

Say following C program is built to an executable prog as follows:

main.c
M1: int helper(int);  // Defined in helper.c
M2: int main() { return helper(7); }  

L1: $(CC) -c main.c
L2: $(CC) -c helper.c
L3: $(CC) -o prog main.o helper.o

Following is the output of running readelf on the executable prog:

$ readelf -l prog
Elf file type is EXEC (Executable file)
Entry point 0x4000b0
There are 2 program headers, starting at offset 64
Program Headers:
Type          Off     VAddr        PAddr        FileSz  MemSz   Flg  Algn
LOAD          0xb0    0x4000b0     0x4000b0     0x78    0x78    R E  0x8
GNU_STACK     0x0     0x0          0x0          0x0     0x0     RW   0x10
 Section to Segment mapping:
  Segment Sections...
   00     .text .eh_frame
   01