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1. Inspect Objective-C methods parameters

   (gdb) info args
   self = (AppController *) 0x12b9f0
   _cmd = (SEL) 0x12f33
   aNotification = (NSNotification *) 0x264a320
   

   i386 - on the stack

   (int *)($ebp+8)     self
   (int *)($ebp+12)    cmd
   (int *)($ebp+16)    arg2
   (int *)($ebp+20)    arg3
   (int *)($ebp+24)    arg4
   (int *)($ebp+28)    arg5
   
   (int *)$eax         return address
   

   ex: (gdb) po *(int*)($ebp+8)

   i386 - in registers

   $esi       self
   $edx       cmd
   $ecx       arg2
   

   x86_64 - in registers

   $rdi          self
   $rsi          cmd
   $rdx          arg2
   $rcx          arg3
   $r8           arg4
   $r9           arg5
   
   $rax          return address
   

   ex: (gdb) po $rax