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 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 15 int copy_inst_from_kernel_nofault(struct ppc_inst *inst, u32 *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, src + 1, sizeof(suffix)); 25 *inst = ppc_inst_prefix(val, suffix); 26 } else { 27 *inst = ppc_inst(val); 28 } 29 return err; 30 } 31