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
14 u64 perf_reg_abi(struct task_struct *tsk)
15 {
16 	return PERF_SAMPLE_REGS_ABI_32;
17 }
18 #else /* Must be CONFIG_64BIT */
19 u64 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 
28 int 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 
37 u64 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 
48 void 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