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
17 u64 perf_reg_abi(struct task_struct *tsk)
18 {
19 return PERF_SAMPLE_REGS_ABI_32;
20 }
21 #else /* Must be CONFIG_64BIT */
22 u64 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
31 int 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
40 u64 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
63 void 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 }
69
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