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08dbd0f8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
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2 | /* |
3 | * Stacktrace support for Hexagon | |
4 | * | |
e1858b2a | 5 | * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved. |
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6 | */ |
7 | ||
8 | #include <linux/sched.h> | |
68db0cf1 | 9 | #include <linux/sched/task_stack.h> |
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10 | #include <linux/stacktrace.h> |
11 | #include <linux/thread_info.h> | |
12 | #include <linux/module.h> | |
13 | ||
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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; | |
63e80314 | 31 | fp = (unsigned long)__builtin_frame_address(0); |
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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); |