How does User Space memory Layout look like?

    +----------------------+ <--- 0xBFFF FFFF (=3GB)
    | environment variable |
    |----------------------| <--- 0xBFFF FD0C 
    | stacks (down grow)   |
    |          |           |
    |          v           |
    |----------------------|
    |                      |
    |     // free memory   |
    |                      |
    |                      |
    |----------------------| <--------------------
    |  myprogram.o         |                    |
    |----------------------|                    |
    |  mylib.o             |                    |
    |----------------------|              executable image      
    |  myutil.o            |                    |     
    |----------------------|                    |
    |  library code (libc) |                    |
    |----------------------| <--------------------                
    |                      | 0x8000 0000 (=2GB) 
    |                      |
    |  other memory        |
    |                      |
    +----------------------+