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
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