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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