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Linux/arch/hexagon/kernel/stacktrace.c

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  1 /*
  2  * Stacktrace support for Hexagon
  3  *
  4  * Copyright (c) 2010-2011, Code Aurora Forum. All rights reserved.
  5  *
  6  * This program is free software; you can redistribute it and/or modify
  7  * it under the terms of the GNU General Public License version 2 and
  8  * only version 2 as published by the Free Software Foundation.
  9  *
 10  * This program is distributed in the hope that it will be useful,
 11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 13  * GNU General Public License for more details.
 14  *
 15  * You should have received a copy of the GNU General Public License
 16  * along with this program; if not, write to the Free Software
 17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 18  * 02110-1301, USA.
 19  */
 20 
 21 #include <linux/sched.h>
 22 #include <linux/stacktrace.h>
 23 #include <linux/thread_info.h>
 24 #include <linux/module.h>
 25 
 26 register unsigned long current_frame_pointer asm("r30");
 27 
 28 struct stackframe {
 29         unsigned long fp;
 30         unsigned long rets;
 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         unsigned long low, high;
 39         unsigned long fp;
 40         struct stackframe *frame;
 41         int skip = trace->skip;
 42 
 43         low = (unsigned long)task_stack_page(current);
 44         high = low + THREAD_SIZE;
 45         fp = current_frame_pointer;
 46 
 47         while (fp >= low && fp <= (high - sizeof(*frame))) {
 48                 frame = (struct stackframe *)fp;
 49 
 50                 if (skip) {
 51                         skip--;
 52                 } else {
 53                         trace->entries[trace->nr_entries++] = frame->rets;
 54                         if (trace->nr_entries >= trace->max_entries)
 55                                 break;
 56                 }
 57 
 58                 /*
 59                  * The next frame must be at a higher address than the
 60                  * current frame.
 61                  */
 62                 low = fp + sizeof(*frame);
 63                 fp = frame->fp;
 64         }
 65 }
 66 EXPORT_SYMBOL_GPL(save_stack_trace);
 67 

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