1 // SPDX-License-Identifier: GPL-2.0-or-later
2 
3 #include <linux/regset.h>
4 
5 #include <asm/switch_to.h>
6 
7 #include "ptrace-decl.h"
8 
9 /*
10  * For get_evrregs/set_evrregs functions 'data' has the following layout:
11  *
12  * struct {
13  *   u32 evr[32];
14  *   u64 acc;
15  *   u32 spefscr;
16  * }
17  */
18 
19 int evr_active(struct task_struct *target, const struct user_regset *regset)
20 {
21 	flush_spe_to_thread(target);
22 	return target->thread.used_spe ? regset->n : 0;
23 }
24 
25 int evr_get(struct task_struct *target, const struct user_regset *regset,
26 	    struct membuf to)
27 {
28 	flush_spe_to_thread(target);
29 
30 	membuf_write(&to, &target->thread.evr, sizeof(target->thread.evr));
31 
32 	BUILD_BUG_ON(offsetof(struct thread_struct, acc) + sizeof(u64) !=
33 		     offsetof(struct thread_struct, spefscr));
34 
35 	return membuf_write(&to, &target->thread.acc,
36 				sizeof(u64) + sizeof(u32));
37 }
38 
39 int evr_set(struct task_struct *target, const struct user_regset *regset,
40 	    unsigned int pos, unsigned int count,
41 	    const void *kbuf, const void __user *ubuf)
42 {
43 	int ret;
44 
45 	flush_spe_to_thread(target);
46 
47 	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
48 				 &target->thread.evr,
49 				 0, sizeof(target->thread.evr));
50 
51 	BUILD_BUG_ON(offsetof(struct thread_struct, acc) + sizeof(u64) !=
52 		     offsetof(struct thread_struct, spefscr));
53 
54 	if (!ret)
55 		ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
56 					 &target->thread.acc,
57 					 sizeof(target->thread.evr), -1);
58 
59 	return ret;
60 }
61