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Linux/arch/parisc/kernel/stacktrace.c

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  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);
 51 

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