Commits on Jan 30, 2017

1. kprobes: Make kprobe register via symbol name …

   In Linux kernel, kprobe can register by function address or symbol name,
   but currently in F9 microkernel, can only register by address.
   
   9 microkernel already include ksymbols when compiling kernel with
   CONFIG_SYMMAP, which means F9 microkernel have the ability to regiser kprobe
   via symbol name, too.
   
   This commit change two parts in F9 microkernel, ksym and kprobes.
   
   * ksym
       - Adding ksym_lookup_name to search function address via symbol name.
   
   * kprobes
       - Adding new field `symbol_name` in struct kprobe.
       - When kprobe is registering, it will get the correct address via
         help function `kprobe_addr`, `kprobe_addr` will return correct
         function address. Also, `kprobe_addr` will failed when it cannot
         match the symbol name in symtab, or address and symbol name are
         used in the same time.
   
   Example usage:
   
   static struct kprobe kp = {
       .symbol_name = "ktimer_handler"
   };
   
   or
   
   extern void ktimer_handler(void);
   static struct kprobe kp = {
       .addr = ktimer_handler
   };

   

   Louie Lu authored and louisom committed Jan 30, 2017
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