Commit | Line | Data |
---|---|---|
eecac38b SH |
1 | /* |
2 | * Stack trace utility for OpenRISC | |
3 | * | |
4 | * Copyright (C) 2017 Stafford Horne <shorne@gmail.com> | |
5 | * | |
6 | * This file is licensed under the terms of the GNU General Public License | |
7 | * version 2. This program is licensed "as is" without any warranty of any | |
8 | * kind, whether express or implied. | |
9 | * | |
10 | * Losely based on work from sh and powerpc. | |
11 | */ | |
12 | ||
13 | #include <linux/export.h> | |
14 | #include <linux/sched.h> | |
15 | #include <linux/sched/debug.h> | |
16 | #include <linux/stacktrace.h> | |
17 | ||
18 | #include <asm/processor.h> | |
19 | #include <asm/unwinder.h> | |
20 | ||
21 | /* | |
22 | * Save stack-backtrace addresses into a stack_trace buffer. | |
23 | */ | |
24 | static void | |
25 | save_stack_address(void *data, unsigned long addr, int reliable) | |
26 | { | |
27 | struct stack_trace *trace = data; | |
28 | ||
29 | if (!reliable) | |
30 | return; | |
31 | ||
32 | if (trace->skip > 0) { | |
33 | trace->skip--; | |
34 | return; | |
35 | } | |
36 | ||
37 | if (trace->nr_entries < trace->max_entries) | |
38 | trace->entries[trace->nr_entries++] = addr; | |
39 | } | |
40 | ||
41 | void save_stack_trace(struct stack_trace *trace) | |
42 | { | |
43 | unwind_stack(trace, (unsigned long *) &trace, save_stack_address); | |
44 | } | |
45 | EXPORT_SYMBOL_GPL(save_stack_trace); | |
46 | ||
47 | static void | |
48 | save_stack_address_nosched(void *data, unsigned long addr, int reliable) | |
49 | { | |
50 | struct stack_trace *trace = (struct stack_trace *)data; | |
51 | ||
52 | if (!reliable) | |
53 | return; | |
54 | ||
55 | if (in_sched_functions(addr)) | |
56 | return; | |
57 | ||
58 | if (trace->skip > 0) { | |
59 | trace->skip--; | |
60 | return; | |
61 | } | |
62 | ||
63 | if (trace->nr_entries < trace->max_entries) | |
64 | trace->entries[trace->nr_entries++] = addr; | |
65 | } | |
66 | ||
67 | void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace) | |
68 | { | |
69 | unsigned long *sp = NULL; | |
70 | ||
71 | if (tsk == current) | |
72 | sp = (unsigned long *) &sp; | |
73 | else | |
74 | sp = (unsigned long *) KSTK_ESP(tsk); | |
75 | ||
76 | unwind_stack(trace, sp, save_stack_address_nosched); | |
77 | } | |
78 | EXPORT_SYMBOL_GPL(save_stack_trace_tsk); | |
79 | ||
80 | void | |
81 | save_stack_trace_regs(struct pt_regs *regs, struct stack_trace *trace) | |
82 | { | |
83 | unwind_stack(trace, (unsigned long *) regs->sp, | |
84 | save_stack_address_nosched); | |
85 | } | |
86 | EXPORT_SYMBOL_GPL(save_stack_trace_regs); |