xref: /linux/arch/riscv/kernel/perf_regs.c (revision cdd38c5f1ce4398ec58fec95904b75824daab7b5) 
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 
perf_reg_value(struct pt_regs * regs,int idx)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 
perf_reg_validate(u64 mask)21 int perf_reg_validate(u64 mask)
22 {
23 	if (!mask || mask & REG_RESERVED)
24 		return -EINVAL;
25 
26 	return 0;
27 }
28 
perf_reg_abi(struct task_struct * task)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 
perf_get_regs_user(struct perf_regs * regs_user,struct pt_regs * regs)38 void perf_get_regs_user(struct perf_regs *regs_user,
39 			struct pt_regs *regs)
40 {
41 	regs_user->regs = task_pt_regs(current);
42 	regs_user->abi = perf_reg_abi(current);
43 }
44