Merge remote-tracking branch 'asoc/fix/intel' into asoc-linus
[linux-2.6-block.git] / arch / s390 / kernel / stacktrace.c
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Stack trace management functions
4  *
5  *  Copyright IBM Corp. 2006
6  *  Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>
7  */
8
9 #include <linux/sched.h>
10 #include <linux/sched/debug.h>
11 #include <linux/stacktrace.h>
12 #include <linux/kallsyms.h>
13 #include <linux/export.h>
14
15 static int __save_address(void *data, unsigned long address, int nosched)
16 {
17         struct stack_trace *trace = data;
18
19         if (nosched && in_sched_functions(address))
20                 return 0;
21         if (trace->skip > 0) {
22                 trace->skip--;
23                 return 0;
24         }
25         if (trace->nr_entries < trace->max_entries) {
26                 trace->entries[trace->nr_entries++] = address;
27                 return 0;
28         }
29         return 1;
30 }
31
32 static int save_address(void *data, unsigned long address, int reliable)
33 {
34         return __save_address(data, address, 0);
35 }
36
37 static int save_address_nosched(void *data, unsigned long address, int reliable)
38 {
39         return __save_address(data, address, 1);
40 }
41
42 void save_stack_trace(struct stack_trace *trace)
43 {
44         unsigned long sp;
45
46         sp = current_stack_pointer();
47         dump_trace(save_address, trace, NULL, sp);
48         if (trace->nr_entries < trace->max_entries)
49                 trace->entries[trace->nr_entries++] = ULONG_MAX;
50 }
51 EXPORT_SYMBOL_GPL(save_stack_trace);
52
53 void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
54 {
55         unsigned long sp;
56
57         sp = tsk->thread.ksp;
58         if (tsk == current)
59                 sp = current_stack_pointer();
60         dump_trace(save_address_nosched, trace, tsk, sp);
61         if (trace->nr_entries < trace->max_entries)
62                 trace->entries[trace->nr_entries++] = ULONG_MAX;
63 }
64 EXPORT_SYMBOL_GPL(save_stack_trace_tsk);
65
66 void save_stack_trace_regs(struct pt_regs *regs, struct stack_trace *trace)
67 {
68         unsigned long sp;
69
70         sp = kernel_stack_pointer(regs);
71         dump_trace(save_address, trace, NULL, sp);
72         if (trace->nr_entries < trace->max_entries)
73                 trace->entries[trace->nr_entries++] = ULONG_MAX;
74 }
75 EXPORT_SYMBOL_GPL(save_stack_trace_regs);