| Olivier Deprez | 157378f | 2022-04-04 15:47:50 +0200 | [diff] [blame^] | 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 */ |