xref: /OK3568_Linux_fs/kernel/arch/csky/kernel/perf_regs.c (revision 4882a59341e53eb6f0b4789bf948001014eff981) 
1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun // Copyright (C) 2019 Hangzhou C-SKY Microsystems co.,ltd.
3*4882a593Smuzhiyun 
4*4882a593Smuzhiyun #include <linux/errno.h>
5*4882a593Smuzhiyun #include <linux/kernel.h>
6*4882a593Smuzhiyun #include <linux/perf_event.h>
7*4882a593Smuzhiyun #include <linux/bug.h>
8*4882a593Smuzhiyun #include <asm/perf_regs.h>
9*4882a593Smuzhiyun #include <asm/ptrace.h>
10*4882a593Smuzhiyun 
perf_reg_value(struct pt_regs * regs,int idx)11*4882a593Smuzhiyun u64 perf_reg_value(struct pt_regs *regs, int idx)
12*4882a593Smuzhiyun {
13*4882a593Smuzhiyun 	if (WARN_ON_ONCE((u32)idx >= PERF_REG_CSKY_MAX))
14*4882a593Smuzhiyun 		return 0;
15*4882a593Smuzhiyun 
16*4882a593Smuzhiyun 	return (u64)*((u32 *)regs + idx);
17*4882a593Smuzhiyun }
18*4882a593Smuzhiyun 
19*4882a593Smuzhiyun #define REG_RESERVED (~((1ULL << PERF_REG_CSKY_MAX) - 1))
20*4882a593Smuzhiyun 
perf_reg_validate(u64 mask)21*4882a593Smuzhiyun int perf_reg_validate(u64 mask)
22*4882a593Smuzhiyun {
23*4882a593Smuzhiyun 	if (!mask || mask & REG_RESERVED)
24*4882a593Smuzhiyun 		return -EINVAL;
25*4882a593Smuzhiyun 
26*4882a593Smuzhiyun 	return 0;
27*4882a593Smuzhiyun }
28*4882a593Smuzhiyun 
perf_reg_abi(struct task_struct * task)29*4882a593Smuzhiyun u64 perf_reg_abi(struct task_struct *task)
30*4882a593Smuzhiyun {
31*4882a593Smuzhiyun 	return PERF_SAMPLE_REGS_ABI_32;
32*4882a593Smuzhiyun }
33*4882a593Smuzhiyun 
perf_get_regs_user(struct perf_regs * regs_user,struct pt_regs * regs)34*4882a593Smuzhiyun void perf_get_regs_user(struct perf_regs *regs_user,
35*4882a593Smuzhiyun 			struct pt_regs *regs)
36*4882a593Smuzhiyun {
37*4882a593Smuzhiyun 	regs_user->regs = task_pt_regs(current);
38*4882a593Smuzhiyun 	regs_user->abi = perf_reg_abi(current);
39*4882a593Smuzhiyun }
40