data can be in:
- .data: used for pre-initialized global writable data (such as global arrays with initial values)
- .rodata: used for global read-only data (such as string constants)
- .bss: used for uninitialized global writable data (such as global arrays without initial values)
- stack: used for statically-allocated local variables
- heap: used for dynamically-allocated (malloc()ed) variables.