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Commit | Line | Data |
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74d04d6f RK |
1 | /* |
2 | * Stacktrace support for Hexagon | |
3 | * | |
e1858b2a | 4 | * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved. |
74d04d6f RK |
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); |