| // SPDX-License-Identifier: GPL-2.0-or-later | |
| /* | |
| * Copyright 2020, IBM Corporation. | |
| */ | |
| #include <linux/uaccess.h> | |
| #include <asm/disassemble.h> | |
| #include <asm/inst.h> | |
| #include <asm/ppc-opcode.h> | |
| #ifdef CONFIG_PPC64 | |
| int probe_user_read_inst(struct ppc_inst *inst, | |
| struct ppc_inst __user *nip) | |
| { | |
| unsigned int val, suffix; | |
| int err; | |
| err = copy_from_user_nofault(&val, nip, sizeof(val)); | |
| if (err) | |
| return err; | |
| if (get_op(val) == OP_PREFIX) { | |
| err = copy_from_user_nofault(&suffix, (void __user *)nip + 4, 4); | |
| *inst = ppc_inst_prefix(val, suffix); | |
| } else { | |
| *inst = ppc_inst(val); | |
| } | |
| return err; | |
| } | |
| int probe_kernel_read_inst(struct ppc_inst *inst, | |
| struct ppc_inst *src) | |
| { | |
| unsigned int val, suffix; | |
| int err; | |
| err = copy_from_kernel_nofault(&val, src, sizeof(val)); | |
| if (err) | |
| return err; | |
| if (get_op(val) == OP_PREFIX) { | |
| err = copy_from_kernel_nofault(&suffix, (void *)src + 4, 4); | |
| *inst = ppc_inst_prefix(val, suffix); | |
| } else { | |
| *inst = ppc_inst(val); | |
| } | |
| return err; | |
| } | |
| #else /* !CONFIG_PPC64 */ | |
| int probe_user_read_inst(struct ppc_inst *inst, | |
| struct ppc_inst __user *nip) | |
| { | |
| unsigned int val; | |
| int err; | |
| err = copy_from_user_nofault(&val, nip, sizeof(val)); | |
| if (!err) | |
| *inst = ppc_inst(val); | |
| return err; | |
| } | |
| int probe_kernel_read_inst(struct ppc_inst *inst, | |
| struct ppc_inst *src) | |
| { | |
| unsigned int val; | |
| int err; | |
| err = copy_from_kernel_nofault(&val, src, sizeof(val)); | |
| if (!err) | |
| *inst = ppc_inst(val); | |
| return err; | |
| } | |
| #endif /* CONFIG_PPC64 */ |