Commit | Line | Data |
---|---|---|
c7b412f4 MF |
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); |