LXR linux/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
  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(&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
  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, &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}
  61