LXR linux/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
  12static void
  13ia64_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 */
  36void save_stack_trace(struct stack_trace *trace)
  37{
  38        unw_init_running(ia64_do_save_stack, trace);
  39}
  40EXPORT_SYMBOL(save_stack_trace);
  41