arch/parisc/kernel/stacktrace.c

   1 /*
   2  * Stack trace management functions
   3  *
   4  *  Copyright (C) 2009 Helge Deller <deller@gmx.de>
   5  *  based on arch/x86/kernel/stacktrace.c by Ingo Molnar <mingo@redhat.com>
   6  *  and parisc unwind functions by Randolph Chung <tausq@debian.org>
   7  *
   8  *  TODO: Userspace stacktrace (CONFIG_USER_STACKTRACE_SUPPORT)
   9  */
  10 #include <linux/module.h>
  11 #include <linux/stacktrace.h>
  12
  13 #include <asm/unwind.h>
  14
  15 static void dump_trace(struct task_struct *task, struct stack_trace *trace)
  16 {
  17         struct unwind_frame_info info;
  18
  19         unwind_frame_init_task(&info, task, NULL);
  20
  21         /* unwind stack and save entries in stack_trace struct */
  22         trace->nr_entries = 0;
  23         while (trace->nr_entries < trace->max_entries) {
  24                 if (unwind_once(&info) < 0 || info.ip == 0)
  25                         break;
  26
  27                 if (__kernel_text_address(info.ip))
  28                         trace->entries[trace->nr_entries++] = info.ip;
  29         }
  30 }
  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         dump_trace(current, trace);
  39         if (trace->nr_entries < trace->max_entries)
  40                 trace->entries[trace->nr_entries++] = ULONG_MAX;
  41 }
  42 EXPORT_SYMBOL_GPL(save_stack_trace);
  43
  44 void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
  45 {
  46         dump_trace(tsk, trace);
  47         if (trace->nr_entries < trace->max_entries)
  48                 trace->entries[trace->nr_entries++] = ULONG_MAX;
  49 }
  50 EXPORT_SYMBOL_GPL(save_stack_trace_tsk);