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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); |
54 |
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