1#include <linux/errno.h>
2#include <linux/kernel.h>
3#include <linux/perf_event.h>
4#include <linux/bug.h>
5
6#include <asm/compat.h>
7#include <asm/perf_regs.h>
8#include <asm/ptrace.h>
9
10u64 perf_reg_value(struct pt_regs *regs, int idx)
11{
12	if (WARN_ON_ONCE((u32)idx >= PERF_REG_ARM64_MAX))
13		return 0;
14
15	/*
16	 * Compat (i.e. 32 bit) mode:
17	 * - PC has been set in the pt_regs struct in kernel_entry,
18	 * - Handle SP and LR here.
19	 */
20	if (compat_user_mode(regs)) {
21		if ((u32)idx == PERF_REG_ARM64_SP)
22			return regs->compat_sp;
23		if ((u32)idx == PERF_REG_ARM64_LR)
24			return regs->compat_lr;
25	}
26
27	if ((u32)idx == PERF_REG_ARM64_SP)
28		return regs->sp;
29
30	if ((u32)idx == PERF_REG_ARM64_PC)
31		return regs->pc;
32
33	return regs->regs[idx];
34}
35
36#define REG_RESERVED (~((1ULL << PERF_REG_ARM64_MAX) - 1))
37
38int perf_reg_validate(u64 mask)
39{
40	if (!mask || mask & REG_RESERVED)
41		return -EINVAL;
42
43	return 0;
44}
45
46u64 perf_reg_abi(struct task_struct *task)
47{
48	if (is_compat_thread(task_thread_info(task)))
49		return PERF_SAMPLE_REGS_ABI_32;
50	else
51		return PERF_SAMPLE_REGS_ABI_64;
52}
53
54void perf_get_regs_user(struct perf_regs *regs_user,
55			struct pt_regs *regs,
56			struct pt_regs *regs_user_copy)
57{
58	regs_user->regs = task_pt_regs(current);
59	regs_user->abi = perf_reg_abi(current);
60}
61