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