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Linux/arch/powerpc/kernel/stacktrace.c

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  1 /*
  2  * Stack trace utility
  3  *
  4  * Copyright 2008 Christoph Hellwig, IBM Corp.
  5  *
  6  *
  7  *      This program is free software; you can redistribute it and/or
  8  *      modify it under the terms of the GNU General Public License
  9  *      as published by the Free Software Foundation; either version
 10  *      2 of the License, or (at your option) any later version.
 11  */
 12 
 13 #include <linux/export.h>
 14 #include <linux/sched.h>
 15 #include <linux/stacktrace.h>
 16 #include <asm/ptrace.h>
 17 #include <asm/processor.h>
 18 
 19 /*
 20  * Save stack-backtrace addresses into a stack_trace buffer.
 21  */
 22 static void save_context_stack(struct stack_trace *trace, unsigned long sp,
 23                         struct task_struct *tsk, int savesched)
 24 {
 25         for (;;) {
 26                 unsigned long *stack = (unsigned long *) sp;
 27                 unsigned long newsp, ip;
 28 
 29                 if (!validate_sp(sp, tsk, STACK_FRAME_OVERHEAD))
 30                         return;
 31 
 32                 newsp = stack[0];
 33                 ip = stack[STACK_FRAME_LR_SAVE];
 34 
 35                 if (savesched || !in_sched_functions(ip)) {
 36                         if (!trace->skip)
 37                                 trace->entries[trace->nr_entries++] = ip;
 38                         else
 39                                 trace->skip--;
 40                 }
 41 
 42                 if (trace->nr_entries >= trace->max_entries)
 43                         return;
 44 
 45                 sp = newsp;
 46         }
 47 }
 48 
 49 void save_stack_trace(struct stack_trace *trace)
 50 {
 51         unsigned long sp;
 52 
 53         sp = current_stack_pointer();
 54 
 55         save_context_stack(trace, sp, current, 1);
 56 }
 57 EXPORT_SYMBOL_GPL(save_stack_trace);
 58 
 59 void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
 60 {
 61         save_context_stack(trace, tsk->thread.ksp, tsk, 0);
 62 }
 63 EXPORT_SYMBOL_GPL(save_stack_trace_tsk);
 64 

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