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 
callchain_trace(void * data,unsigned long pc)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 
perf_callchain_user(struct perf_callchain_entry_ctx * entry,struct pt_regs * regs)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 
perf_callchain_kernel(struct perf_callchain_entry_ctx * entry,struct pt_regs * regs)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 
perf_instruction_pointer(struct pt_regs * regs)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 
perf_misc_flags(struct pt_regs * regs)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