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
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.