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
probe_user_read_inst(struct ppc_inst * inst,struct ppc_inst __user * nip)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
probe_kernel_read_inst(struct ppc_inst * inst,struct ppc_inst * src)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 */
probe_user_read_inst(struct ppc_inst * inst,struct ppc_inst __user * nip)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
probe_kernel_read_inst(struct ppc_inst * inst,struct ppc_inst * src)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 */
74