1// SPDX-License-Identifier: GPL-2.0
 2/*
 3 * This file is subject to the terms and conditions of the GNU General Public
 4 * License.  See the file "COPYING" in the main directory of this archive
 5 * for more details.
 6 *
 7 * Some parts derived from x86 version of this file.
 8 *
 9 * Copyright (C) 2013 Cavium, Inc.
10 */
11
12#include <linux/perf_event.h>
13
14#include <asm/ptrace.h>
15
16#ifdef CONFIG_32BIT
17u64 perf_reg_abi(struct task_struct *tsk)
18{
19	return PERF_SAMPLE_REGS_ABI_32;
20}
21#else /* Must be CONFIG_64BIT */
22u64 perf_reg_abi(struct task_struct *tsk)
23{
24	if (test_tsk_thread_flag(tsk, TIF_32BIT_REGS))
25		return PERF_SAMPLE_REGS_ABI_32;
26	else
27		return PERF_SAMPLE_REGS_ABI_64;
28}
29#endif /* CONFIG_32BIT */
30
31int perf_reg_validate(u64 mask)
32{
33	if (!mask)
34		return -EINVAL;
35	if (mask & ~((1ull << PERF_REG_MIPS_MAX) - 1))
36		return -EINVAL;
37	return 0;
38}
39
40u64 perf_reg_value(struct pt_regs *regs, int idx)
41{
42	long v;
43
44	switch (idx) {
45	case PERF_REG_MIPS_PC:
46		v = regs->cp0_epc;
47		break;
48	case PERF_REG_MIPS_R1 ... PERF_REG_MIPS_R25:
49		v = regs->regs[idx - PERF_REG_MIPS_R1 + 1];
50		break;
51	case PERF_REG_MIPS_R28 ... PERF_REG_MIPS_R31:
52		v = regs->regs[idx - PERF_REG_MIPS_R28 + 28];
53		break;
54
55	default:
56		WARN_ON_ONCE(1);
57		return 0;
58	}
59
60	return (s64)v; /* Sign extend if 32-bit. */
61}
62
63void perf_get_regs_user(struct perf_regs *regs_user,
64			struct pt_regs *regs)
65{
66	regs_user->regs = task_pt_regs(current);
67	regs_user->abi = perf_reg_abi(current);
68}