1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 2022 Loongson Technology Corporation Limited
4 *
5 * Derived from MIPS:
6 * Copyright (C) 2013 Cavium, Inc.
7 */
8
9#include <linux/perf_event.h>
10
11#include <asm/ptrace.h>
12
13#ifdef CONFIG_32BIT
14u64 perf_reg_abi(struct task_struct *tsk)
15{
16	return PERF_SAMPLE_REGS_ABI_32;
17}
18#else /* Must be CONFIG_64BIT */
19u64 perf_reg_abi(struct task_struct *tsk)
20{
21	if (test_tsk_thread_flag(tsk, TIF_32BIT_REGS))
22		return PERF_SAMPLE_REGS_ABI_32;
23	else
24		return PERF_SAMPLE_REGS_ABI_64;
25}
26#endif /* CONFIG_32BIT */
27
28int perf_reg_validate(u64 mask)
29{
30	if (!mask)
31		return -EINVAL;
32	if (mask & ~((1ull << PERF_REG_LOONGARCH_MAX) - 1))
33		return -EINVAL;
34	return 0;
35}
36
37u64 perf_reg_value(struct pt_regs *regs, int idx)
38{
39	if (WARN_ON_ONCE((u32)idx >= PERF_REG_LOONGARCH_MAX))
40		return 0;
41
42	if ((u32)idx == PERF_REG_LOONGARCH_PC)
43		return regs->csr_era;
44
45	return regs->regs[idx];
46}
47
48void perf_get_regs_user(struct perf_regs *regs_user,
49			struct pt_regs *regs)
50{
51	regs_user->regs = task_pt_regs(current);
52	regs_user->abi = perf_reg_abi(current);
53}
54