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             unsigned int pos, unsigned int count, void *kbuf, void __user *ubuf)
  27 {
  28         int ret;
  29
  30         flush_spe_to_thread(target);
  31
  32         ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
  33                                   &target->thread.evr,
  34                                   0, sizeof(target->thread.evr));
  35
  36         BUILD_BUG_ON(offsetof(struct thread_struct, acc) + sizeof(u64) !=
  37                      offsetof(struct thread_struct, spefscr));
  38
  39         if (!ret)
  40                 ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
  41                                           &target->thread.acc,
  42                                           sizeof(target->thread.evr), -1);
  43
  44         return ret;
  45 }
  46
  47 int evr_set(struct task_struct *target, const struct user_regset *regset,
  48             unsigned int pos, unsigned int count,
  49             const void *kbuf, const void __user *ubuf)
  50 {
  51         int ret;
  52
  53         flush_spe_to_thread(target);
  54
  55         ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
  56                                  &target->thread.evr,
  57                                  0, sizeof(target->thread.evr));
  58
  59         BUILD_BUG_ON(offsetof(struct thread_struct, acc) + sizeof(u64) !=
  60                      offsetof(struct thread_struct, spefscr));
  61
  62         if (!ret)
  63                 ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
  64                                          &target->thread.acc,
  65                                          sizeof(target->thread.evr), -1);
  66
  67         return ret;
  68 }