1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * arm64 callchain support
4 *
5 * Copyright (C) 2015 ARM Limited
6 */
7 #include <linux/perf_event.h>
8 #include <linux/stacktrace.h>
9 #include <linux/uaccess.h>
10
11 #include <asm/pointer_auth.h>
12
13 static bool callchain_trace(void *data, unsigned long pc)
14 {
15 struct perf_callchain_entry_ctx *entry = data;
16
17 return perf_callchain_store(entry, pc) == 0;
18 }
19
20 void perf_callchain_user(struct perf_callchain_entry_ctx *entry,
21 struct pt_regs *regs)
22 {
23 if (perf_guest_state()) {
24 /* We don't support guest os callchain now */
25 return;
26 }
27
28 arch_stack_walk_user(callchain_trace, entry, regs);
29 }
30
31 void perf_callchain_kernel(struct perf_callchain_entry_ctx *entry,
32 struct pt_regs *regs)
33 {
34 if (perf_guest_state()) {
35 /* We don't support guest os callchain now */
36 return;
37 }
38
39 arch_stack_walk(callchain_trace, entry, current, regs);
40 }
41
42 unsigned long perf_instruction_pointer(struct pt_regs *regs)
43 {
44 if (perf_guest_state())
45 return perf_guest_get_ip();
46
47 return instruction_pointer(regs);
48 }
49
50 unsigned long perf_misc_flags(struct pt_regs *regs)
51 {
52 unsigned int guest_state = perf_guest_state();
53 int misc = 0;
54
55 if (guest_state) {
56 if (guest_state & PERF_GUEST_USER)
57 misc |= PERF_RECORD_MISC_GUEST_USER;
58 else
59 misc |= PERF_RECORD_MISC_GUEST_KERNEL;
60 } else {
61 if (user_mode(regs))
62 misc |= PERF_RECORD_MISC_USER;
63 else
64 misc |= PERF_RECORD_MISC_KERNEL;
65 }
66
67 return misc;
68 }
69
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.