arch/powerpc/kernel/ptrace/ptrace-spe.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  * 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 }