arch/powerpc/kernel/ptrace/ptrace-novsx.c

   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  */
  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  */
  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 }