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  * Copyright (C) 2021 Loongson Technology Corporation Limited
11  */
12 
13 #include <linux/perf_event.h>
14 
15 #include <asm/ptrace.h>
16 
17 #ifdef CONFIG_32BIT
perf_reg_abi(struct task_struct *tsk)18 u64 perf_reg_abi(struct task_struct *tsk)
19 {
20 	return PERF_SAMPLE_REGS_ABI_32;
21 }
22 #else /* Must be CONFIG_64BIT */
perf_reg_abi(struct task_struct *tsk)23 u64 perf_reg_abi(struct task_struct *tsk)
24 {
25 	if (test_tsk_thread_flag(tsk, TIF_32BIT_REGS))
26 		return PERF_SAMPLE_REGS_ABI_32;
27 	else
28 		return PERF_SAMPLE_REGS_ABI_64;
29 }
30 #endif /* CONFIG_32BIT */
31 
perf_reg_validate(u64 mask)32 int perf_reg_validate(u64 mask)
33 {
34 	if (!mask)
35 		return -EINVAL;
36 	if (mask & ~((1ull << PERF_REG_LOONGARCH_MAX) - 1))
37 		return -EINVAL;
38 	return 0;
39 }
40 
perf_reg_value(struct pt_regs *regs, int idx)41 u64 perf_reg_value(struct pt_regs *regs, int idx)
42 {
43 	if (WARN_ON_ONCE((u32)idx >= PERF_REG_LOONGARCH_MAX))
44 		return 0;
45 
46 	if ((u32)idx == PERF_REG_LOONGARCH_PC)
47 		return regs->csr_era;
48 
49 	return regs->regs[idx];
50 }
51 
perf_get_regs_user(struct perf_regs *regs_user, struct pt_regs *regs)52 void perf_get_regs_user(struct perf_regs *regs_user,
53 			struct pt_regs *regs)
54 {
55 	regs_user->regs = task_pt_regs(current);
56 	regs_user->abi = perf_reg_abi(current);
57 }
58