Eric Lee / smarc-fsl-linux-kernel

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kernel/stacktrace.c 1.79 KB
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81f7e3824   Eric Lee   Initial Release, ... 
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  /*
   * kernel/stacktrace.c
   *
   * Stack trace management functions
   *
   *  Copyright (C) 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
   */
  #include <linux/sched.h>
  #include <linux/kernel.h>
  #include <linux/export.h>
  #include <linux/kallsyms.h>
  #include <linux/stacktrace.h>
  
  void print_stack_trace(struct stack_trace *trace, int spaces)
  {
  	int i;
  
  	if (WARN_ON(!trace->entries))
  		return;
  
  	for (i = 0; i < trace->nr_entries; i++)
  		printk("%*c%pS
  ", 1 + spaces, ' ', (void *)trace->entries[i]);
  }
  EXPORT_SYMBOL_GPL(print_stack_trace);
  
  int snprint_stack_trace(char *buf, size_t size,
  			struct stack_trace *trace, int spaces)
  {
  	int i;
  	int generated;
  	int total = 0;
  
  	if (WARN_ON(!trace->entries))
  		return 0;
  
  	for (i = 0; i < trace->nr_entries; i++) {
  		generated = snprintf(buf, size, "%*c%pS
  ", 1 + spaces, ' ',
  				     (void *)trace->entries[i]);
  
  		total += generated;
  
  		/* Assume that generated isn't a negative number */
  		if (generated >= size) {
  			buf += size;
  			size = 0;
  		} else {
  			buf += generated;
  			size -= generated;
  		}
  	}
  
  	return total;
  }
  EXPORT_SYMBOL_GPL(snprint_stack_trace);
  
  /*
   * Architectures that do not implement save_stack_trace_*()
   * get these weak aliases and once-per-bootup warnings
   * (whenever this facility is utilized - for example by procfs):
   */
  __weak void
  save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
  {
  	WARN_ONCE(1, KERN_INFO "save_stack_trace_tsk() not implemented yet.
  ");
  }
  
  __weak void
  save_stack_trace_regs(struct pt_regs *regs, struct stack_trace *trace)
  {
  	WARN_ONCE(1, KERN_INFO "save_stack_trace_regs() not implemented yet.
  ");
  }
  
  __weak int
  save_stack_trace_tsk_reliable(struct task_struct *tsk,
  			      struct stack_trace *trace)
  {
  	WARN_ONCE(1, KERN_INFO "save_stack_tsk_reliable() not implemented yet.
  ");
  	return -ENOSYS;
  }