kernel/stacktrace.c

   1 /*
   2  * kernel/stacktrace.c
   3  *
   4  * Stack trace management functions
   5  *
   6  *  Copyright (C) 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
   7  */
   8 #include <linux/sched.h>
   9 #include <linux/kernel.h>
  10 #include <linux/export.h>
  11 #include <linux/kallsyms.h>
  12 #include <linux/stacktrace.h>
  13
  14 void print_stack_trace(struct stack_trace *trace, int spaces)
  15 {
  16         int i;
  17
  18         if (WARN_ON(!trace->entries))
  19                 return;
  20
  21         for (i = 0; i < trace->nr_entries; i++) {
  22                 printk("%*c", 1 + spaces, ' ');
  23                 print_ip_sym(trace->entries[i]);
  24         }
  25 }
  26 EXPORT_SYMBOL_GPL(print_stack_trace);
  27
  28 /*
  29  * Architectures that do not implement save_stack_trace_tsk or
  30  * save_stack_trace_regs get this weak alias and a once-per-bootup warning
  31  * (whenever this facility is utilized - for example by procfs):
  32  */
  33 __weak void
  34 save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
  35 {
  36         WARN_ONCE(1, KERN_INFO "save_stack_trace_tsk() not implemented yet.\n");
  37 }
  38
  39 __weak void
  40 save_stack_trace_regs(struct pt_regs *regs, struct stack_trace *trace)
  41 {
  42         WARN_ONCE(1, KERN_INFO "save_stack_trace_regs() not implemented yet.\n");
  43 }