arch/ia64/kernel/stacktrace.c

   1 /*
   2  * arch/ia64/kernel/stacktrace.c
   3  *
   4  * Stack trace management functions
   5  *
   6  */
   7 #include <linux/sched.h>
   8 #include <linux/stacktrace.h>
   9 #include <linux/module.h>
  10
  11 static void
  12 ia64_do_save_stack(struct unw_frame_info *info, void *arg)
  13 {
  14         struct stack_trace *trace = arg;
  15         unsigned long ip;
  16         int skip = trace->skip;
  17
  18         trace->nr_entries = 0;
  19         do {
  20                 unw_get_ip(info, &ip);
  21                 if (ip == 0)
  22                         break;
  23                 if (skip == 0) {
  24                         trace->entries[trace->nr_entries++] = ip;
  25                         if (trace->nr_entries == trace->max_entries)
  26                                 break;
  27                 } else
  28                         skip--;
  29         } while (unw_unwind(info) >= 0);
  30 }
  31
  32 /*
  33  * Save stack-backtrace addresses into a stack_trace buffer.
  34  */
  35 void save_stack_trace(struct stack_trace *trace)
  36 {
  37         unw_init_running(ia64_do_save_stack, trace);
  38 }
  39 EXPORT_SYMBOL(save_stack_trace);