Blackfin: bf54x: drop unused legacy MMR names
[linux-2.6.git] / arch / blackfin / kernel / stacktrace.c
1 /*
2  * Blackfin stacktrace code (mostly copied from avr32)
3  *
4  * Copyright 2009 Analog Devices Inc.
5  * Licensed under the GPL-2 or later.
6  */
7
8 #include <linux/sched.h>
9 #include <linux/stacktrace.h>
10 #include <linux/thread_info.h>
11 #include <linux/module.h>
12
13 register unsigned long current_frame_pointer asm("FP");
14
15 struct stackframe {
16         unsigned long fp;
17         unsigned long rets;
18 };
19
20 /*
21  * Save stack-backtrace addresses into a stack_trace buffer.
22  */
23 void save_stack_trace(struct stack_trace *trace)
24 {
25         unsigned long low, high;
26         unsigned long fp;
27         struct stackframe *frame;
28         int skip = trace->skip;
29
30         low = (unsigned long)task_stack_page(current);
31         high = low + THREAD_SIZE;
32         fp = current_frame_pointer;
33
34         while (fp >= low && fp <= (high - sizeof(*frame))) {
35                 frame = (struct stackframe *)fp;
36
37                 if (skip) {
38                         skip--;
39                 } else {
40                         trace->entries[trace->nr_entries++] = frame->rets;
41                         if (trace->nr_entries >= trace->max_entries)
42                                 break;
43                 }
44
45                 /*
46                  * The next frame must be at a higher address than the
47                  * current frame.
48                  */
49                 low = fp + sizeof(*frame);
50                 fp = frame->fp;
51         }
52 }
53 EXPORT_SYMBOL_GPL(save_stack_trace);