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
19int 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
25int 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
39int 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