arch/ia64/kernel/stacktrace.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * arch/ia64/kernel/stacktrace.c
   4  *
   5  * Stack trace management functions
   6  *
   7  */
   8 #include <linux/sched.h>
   9 #include <linux/stacktrace.h>
  10 #include <linux/module.h>
  11
  12 static void
  13 ia64_do_save_stack(struct unw_frame_info *info, void *arg)
  14 {
  15         struct stack_trace *trace = arg;
  16         unsigned long ip;
  17         int skip = trace->skip;
  18
  19         trace->nr_entries = 0;
  20         do {
  21                 unw_get_ip(info, &ip);
  22                 if (ip == 0)
  23                         break;
  24                 if (skip == 0) {
  25                         trace->entries[trace->nr_entries++] = ip;
  26                         if (trace->nr_entries == trace->max_entries)
  27                                 break;
  28                 } else
  29                         skip--;
  30         } while (unw_unwind(info) >= 0);
  31 }
  32
  33 /*
  34  * Save stack-backtrace addresses into a stack_trace buffer.
  35  */
  36 void save_stack_trace(struct stack_trace *trace)
  37 {
  38         unw_init_running(ia64_do_save_stack, trace);
  39 }
  40 EXPORT_SYMBOL(save_stack_trace);