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Linux/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%pS\n", 1 + spaces, ' ', (void *)trace->entries[i]);
 23 }
 24 EXPORT_SYMBOL_GPL(print_stack_trace);
 25 
 26 int snprint_stack_trace(char *buf, size_t size,
 27                         struct stack_trace *trace, int spaces)
 28 {
 29         int i;
 30         int generated;
 31         int total = 0;
 32 
 33         if (WARN_ON(!trace->entries))
 34                 return 0;
 35 
 36         for (i = 0; i < trace->nr_entries; i++) {
 37                 generated = snprintf(buf, size, "%*c%pS\n", 1 + spaces, ' ',
 38                                      (void *)trace->entries[i]);
 39 
 40                 total += generated;
 41 
 42                 /* Assume that generated isn't a negative number */
 43                 if (generated >= size) {
 44                         buf += size;
 45                         size = 0;
 46                 } else {
 47                         buf += generated;
 48                         size -= generated;
 49                 }
 50         }
 51 
 52         return total;
 53 }
 54 EXPORT_SYMBOL_GPL(snprint_stack_trace);
 55 
 56 /*
 57  * Architectures that do not implement save_stack_trace_tsk or
 58  * save_stack_trace_regs get this weak alias and a once-per-bootup warning
 59  * (whenever this facility is utilized - for example by procfs):
 60  */
 61 __weak void
 62 save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
 63 {
 64         WARN_ONCE(1, KERN_INFO "save_stack_trace_tsk() not implemented yet.\n");
 65 }
 66 
 67 __weak void
 68 save_stack_trace_regs(struct pt_regs *regs, struct stack_trace *trace)
 69 {
 70         WARN_ONCE(1, KERN_INFO "save_stack_trace_regs() not implemented yet.\n");
 71 }
 72 

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