| 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, flag: 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 |