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 * Regardless of transactions, 'fp_state' holds the current running
11 * value of all FPR registers and 'ckfp_state' holds the last checkpointed
12 * value of all FPR registers for the current transaction.
13 *
14 * Userspace interface buffer layout:
15 *
16 * struct data {
17 * u64 fpr[32];
18 * u64 fpscr;
19 * };
20 */
fpr_get(struct task_struct * target,const struct user_regset * regset,struct membuf to)21 int fpr_get(struct task_struct *target, const struct user_regset *regset,
22 struct membuf to)
23 {
24 BUILD_BUG_ON(offsetof(struct thread_fp_state, fpscr) !=
25 offsetof(struct thread_fp_state, fpr[32]));
26
27 flush_fp_to_thread(target);
28
29 return membuf_write(&to, &target->thread.fp_state, 33 * sizeof(u64));
30 }
31
32 /*
33 * Regardless of transactions, 'fp_state' holds the current running
34 * value of all FPR registers and 'ckfp_state' holds the last checkpointed
35 * value of all FPR registers for the current transaction.
36 *
37 * Userspace interface buffer layout:
38 *
39 * struct data {
40 * u64 fpr[32];
41 * u64 fpscr;
42 * };
43 *
44 */
fpr_set(struct task_struct * target,const struct user_regset * regset,unsigned int pos,unsigned int count,const void * kbuf,const void __user * ubuf)45 int fpr_set(struct task_struct *target, const struct user_regset *regset,
46 unsigned int pos, unsigned int count,
47 const void *kbuf, const void __user *ubuf)
48 {
49 BUILD_BUG_ON(offsetof(struct thread_fp_state, fpscr) !=
50 offsetof(struct thread_fp_state, fpr[32]));
51
52 flush_fp_to_thread(target);
53
54 return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
55 &target->thread.fp_state, 0, -1);
56 }
57