arch/powerpc/lib/inst.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  Copyright 2020, IBM Corporation.
   4  */
   5
   6 #include <linux/uaccess.h>
   7 #include <asm/disassemble.h>
   8 #include <asm/inst.h>
   9 #include <asm/ppc-opcode.h>
  10
  11 #ifdef CONFIG_PPC64
  12 int probe_user_read_inst(struct ppc_inst *inst,
  13                          struct ppc_inst __user *nip)
  14 {
  15         unsigned int val, suffix;
  16         int err;
  17
  18         err = copy_from_user_nofault(&val, nip, sizeof(val));
  19         if (err)
  20                 return err;
  21         if (get_op(val) == OP_PREFIX) {
  22                 err = copy_from_user_nofault(&suffix, (void __user *)nip + 4, 4);
  23                 *inst = ppc_inst_prefix(val, suffix);
  24         } else {
  25                 *inst = ppc_inst(val);
  26         }
  27         return err;
  28 }
  29
  30 int probe_kernel_read_inst(struct ppc_inst *inst,
  31                            struct ppc_inst *src)
  32 {
  33         unsigned int val, suffix;
  34         int err;
  35
  36         err = copy_from_kernel_nofault(&val, src, sizeof(val));
  37         if (err)
  38                 return err;
  39         if (get_op(val) == OP_PREFIX) {
  40                 err = copy_from_kernel_nofault(&suffix, (void *)src + 4, 4);
  41                 *inst = ppc_inst_prefix(val, suffix);
  42         } else {
  43                 *inst = ppc_inst(val);
  44         }
  45         return err;
  46 }
  47 #else /* !CONFIG_PPC64 */
  48 int probe_user_read_inst(struct ppc_inst *inst,
  49                          struct ppc_inst __user *nip)
  50 {
  51         unsigned int val;
  52         int err;
  53
  54         err = copy_from_user_nofault(&val, nip, sizeof(val));
  55         if (!err)
  56                 *inst = ppc_inst(val);
  57
  58         return err;
  59 }
  60
  61 int probe_kernel_read_inst(struct ppc_inst *inst,
  62                            struct ppc_inst *src)
  63 {
  64         unsigned int val;
  65         int err;
  66
  67         err = copy_from_kernel_nofault(&val, src, sizeof(val));
  68         if (!err)
  69                 *inst = ppc_inst(val);
  70
  71         return err;
  72 }
  73 #endif /* CONFIG_PPC64 */