1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Stacktrace support for Hexagon
4 *
5 * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.
6 */
7
8 #include <linux/sched.h>
9 #include <linux/sched/task_stack.h>
10 #include <linux/stacktrace.h>
11 #include <linux/thread_info.h>
12 #include <linux/module.h>
13
14 struct stackframe {
15 unsigned long fp;
16 unsigned long rets;
17 };
18
19 /*
20 * Save stack-backtrace addresses into a stack_trace buffer.
21 */
22 void save_stack_trace(struct stack_trace *trace)
23 {
24 unsigned long low, high;
25 unsigned long fp;
26 struct stackframe *frame;
27 int skip = trace->skip;
28
29 low = (unsigned long)task_stack_page(current);
30 high = low + THREAD_SIZE;
31 fp = (unsigned long)__builtin_frame_address(0);
32
33 while (fp >= low && fp <= (high - sizeof(*frame))) {
34 frame = (struct stackframe *)fp;
35
36 if (skip) {
37 skip--;
38 } else {
39 trace->entries[trace->nr_entries++] = frame->rets;
40 if (trace->nr_entries >= trace->max_entries)
41 break;
42 }
43
44 /*
45 * The next frame must be at a higher address than the
46 * current frame.
47 */
48 low = fp + sizeof(*frame);
49 fp = frame->fp;
50 }
51 }
52 EXPORT_SYMBOL_GPL(save_stack_trace);
53
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