summaryrefslogblamecommitdiff
path: root/arch/arm64/kernel/perf_regs.c
blob: 3f62b35fb6f157c49c1adb8b4cc3ec2744cc1e48 (plain) (tree) 
2ee0d7fd36a3 ^




ff268ff7f32b ^


2ee0d7fd36a3 ^




















5b75a6af1135 ^






2ee0d7fd36a3 ^




















88a7c26af8da ^








1
2
3
4

5
6

7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26

27
28
29
30
31
32

33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52

53
54
55
56
57
58
59
60




                             

                       



















                                                                   





                                          



















                                                          







                                                       
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/perf_event.h>
#include <linux/bug.h>

#include <asm/compat.h>
#include <asm/perf_regs.h>
#include <asm/ptrace.h>

u64 perf_reg_value(struct pt_regs *regs, int idx)
{
	if (WARN_ON_ONCE((u32)idx >= PERF_REG_ARM64_MAX))
		return 0;

	/*
	 * Compat (i.e. 32 bit) mode:
	 * - PC has been set in the pt_regs struct in kernel_entry,
	 * - Handle SP and LR here.
	 */
	if (compat_user_mode(regs)) {
		if ((u32)idx == PERF_REG_ARM64_SP)
			return regs->compat_sp;
		if ((u32)idx == PERF_REG_ARM64_LR)
			return regs->compat_lr;
	}

	if ((u32)idx == PERF_REG_ARM64_SP)
		return regs->sp;

	if ((u32)idx == PERF_REG_ARM64_PC)
		return regs->pc;

	return regs->regs[idx];
}

#define REG_RESERVED (~((1ULL << PERF_REG_ARM64_MAX) - 1))

int perf_reg_validate(u64 mask)
{
	if (!mask || mask & REG_RESERVED)
		return -EINVAL;

	return 0;
}

u64 perf_reg_abi(struct task_struct *task)
{
	if (is_compat_thread(task_thread_info(task)))
		return PERF_SAMPLE_REGS_ABI_32;
	else
		return PERF_SAMPLE_REGS_ABI_64;
}

void perf_get_regs_user(struct perf_regs *regs_user,
			struct pt_regs *regs,
			struct pt_regs *regs_user_copy)
{
	regs_user->regs = task_pt_regs(current);
	regs_user->abi = perf_reg_abi(current);
}