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(s: &to, v: &target->thread.evr, size: 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(s: &to, v: &target->thread.acc,
36 size: 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: &pos, count: &count, kbuf: &kbuf, ubuf: &ubuf,
48 data: &target->thread.evr,
49 start_pos: 0, end_pos: 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: &pos, count: &count, kbuf: &kbuf, ubuf: &ubuf,
56 data: &target->thread.acc,
57 start_pos: sizeof(target->thread.evr), end_pos: -1);
58
59 return ret;
60}
61

source code of linux/arch/powerpc/kernel/ptrace/ptrace-spe.c