1 // SPDX-License-Identifier: GPL-2.0 2 /* Copyright (C) 2019 Hangzhou C-SKY Microsystems co.,ltd. */ 3 4 #include <linux/errno.h> 5 #include <linux/kernel.h> 6 #include <linux/perf_event.h> 7 #include <linux/bug.h> 8 #include <asm/perf_regs.h> 9 #include <asm/ptrace.h> 10 11 u64 perf_reg_value(struct pt_regs *regs, int idx) 12 { 13 if (WARN_ON_ONCE((u32)idx >= PERF_REG_RISCV_MAX)) 14 return 0; 15 16 return ((unsigned long *)regs)[idx]; 17 } 18 19 #define REG_RESERVED (~((1ULL << PERF_REG_RISCV_MAX) - 1)) 20 21 int perf_reg_validate(u64 mask) 22 { 23 if (!mask || mask & REG_RESERVED) 24 return -EINVAL; 25 26 return 0; 27 } 28 29 u64 perf_reg_abi(struct task_struct *task) 30 { 31 #if __riscv_xlen == 64 32 return PERF_SAMPLE_REGS_ABI_64; 33 #else 34 return PERF_SAMPLE_REGS_ABI_32; 35 #endif 36 } 37 38 void perf_get_regs_user(struct perf_regs *regs_user, 39 struct pt_regs *regs, 40 struct pt_regs *regs_user_copy) 41 { 42 regs_user->regs = task_pt_regs(current); 43 regs_user->abi = perf_reg_abi(current); 44 } 45