1 // SPDX-License-Identifier: GPL-2.0-only
2
3 #include <linux/uaccess.h>
4 #include <linux/kernel.h>
5
6 #include <asm/disassemble.h>
7 #include <asm/inst.h>
8 #include <asm/ppc-opcode.h>
9
copy_from_kernel_nofault_allowed(const void * unsafe_src,size_t size)10 bool copy_from_kernel_nofault_allowed(const void *unsafe_src, size_t size)
11 {
12 return is_kernel_addr((unsigned long)unsafe_src);
13 }
14
copy_inst_from_kernel_nofault(struct ppc_inst * inst,struct ppc_inst * src)15 int copy_inst_from_kernel_nofault(struct ppc_inst *inst, struct ppc_inst *src)
16 {
17 unsigned int val, suffix;
18 int err;
19
20 err = copy_from_kernel_nofault(&val, src, sizeof(val));
21 if (err)
22 return err;
23 if (IS_ENABLED(CONFIG_PPC64) && get_op(val) == OP_PREFIX) {
24 err = copy_from_kernel_nofault(&suffix, (void *)src + 4, 4);
25 *inst = ppc_inst_prefix(val, suffix);
26 } else {
27 *inst = ppc_inst(val);
28 }
29 return err;
30 }
31