What’s in an Object File or Executable?

int j = 327;

char* s = “hello\n”;

char sbuf[512];

int p() {

int k = 0;

j = write(1, s, 6);

return(j);

}

Used by linker; may be removed after final link step and strip.

Header “magic number”

indicates type of image.

Section table an array

of (offset, len, startVA)

program sections

program instructions

immutable data (constants)

“hello\n”

writable global/static data

j, s

j, s ,p,sbuf