| 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, flag: 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 |