On Wed, Dec 12, 2012 at 3:56 PM, Fabio Pozzi <pozzi.fabio@xxxxxxxxx> wrote: >> Why function arguments are stored from offset 12 of SP? Also notice >> values at offset 0 to 10 are always same, and value at offset 11 >> increases by 20 on each invocation of function foo(). > > You have to consider that local variables are allocated on the stack, > thus both i, stackptr and sp are allocated on > the stack, so if you print all the stack records you will find this > variables, then the return pointer, the saved frame pointer (if saved) > and then the function parameters. > See http://en.wikipedia.org/wiki/Call_stack for a better explanation. > If you want to access immediately to the function call parameters you > should start from the frame pointer address (if there's one). > To play with backtraces you may find useful the backtrace function[1] > and libraries like libunwind[2] which take care of this details for > you. > > [1] http://tdistler.com/2008/11/15/how-to-print-a-stack-backtrace-programatically-in-linux > [2] http://www.nongnu.org/libunwind/ > > -- > Saluti, > Fabio Pozzi Thanks Fabio, You solved a lot of doubts for me. How to get the frame pointer address? -- Manavendra Nath Manav _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
