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 #ifdef CONFIG_PPC_FPU_REGS
  25         BUILD_BUG_ON(offsetof(struct thread_fp_state, fpscr) !=
  26                      offsetof(struct thread_fp_state, fpr[32]));
  27
  28         flush_fp_to_thread(target);
  29
  30         return membuf_write(&to, &target->thread.fp_state, 33 * sizeof(u64));
  31 #else
  32         return membuf_write(&to, &empty_zero_page, 33 * sizeof(u64));
  33 #endif
  34 }
  35
  36 /*
  37  * Regardless of transactions, 'fp_state' holds the current running
  38  * value of all FPR registers and 'ckfp_state' holds the last checkpointed
  39  * value of all FPR registers for the current transaction.
  40  *
  41  * Userspace interface buffer layout:
  42  *
  43  * struct data {
  44  *      u64     fpr[32];
  45  *      u64     fpscr;
  46  * };
  47  *
  48  */
  49 int fpr_set(struct task_struct *target, const struct user_regset *regset,
  50             unsigned int pos, unsigned int count,
  51             const void *kbuf, const void __user *ubuf)
  52 {
  53 #ifdef CONFIG_PPC_FPU_REGS
  54         BUILD_BUG_ON(offsetof(struct thread_fp_state, fpscr) !=
  55                      offsetof(struct thread_fp_state, fpr[32]));
  56
  57         flush_fp_to_thread(target);
  58
  59         return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
  60                                   &target->thread.fp_state, 0, -1);
  61 #else
  62         return 0;
  63 #endif
  64 }