1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 * livepatch.h - powerpc-specific Kernel Live Patching Core 4 * 5 * Copyright (C) 2015-2016, SUSE, IBM Corp. 6 */ 7 #ifndef _ASM_POWERPC_LIVEPATCH_H 8 #define _ASM_POWERPC_LIVEPATCH_H 9 10 #include <linux/module.h> 11 #include <linux/ftrace.h> 12 #include <linux/sched/task_stack.h> 13 14 #ifdef CONFIG_LIVEPATCH 15 static inline void klp_arch_set_pc(struct pt_regs *regs, unsigned long ip) 16 { 17 regs->nip = ip; 18 } 19 20 #define klp_get_ftrace_location klp_get_ftrace_location 21 static inline unsigned long klp_get_ftrace_location(unsigned long faddr) 22 { 23 /* 24 * Live patch works only with -mprofile-kernel on PPC. In this case, 25 * the ftrace location is always within the first 16 bytes. 26 */ 27 return ftrace_location_range(faddr, faddr + 16); 28 } 29 30 static inline void klp_init_thread_info(struct task_struct *p) 31 { 32 /* + 1 to account for STACK_END_MAGIC */ 33 task_thread_info(p)->livepatch_sp = end_of_stack(p) + 1; 34 } 35 #else 36 static inline void klp_init_thread_info(struct task_struct *p) { } 37 #endif /* CONFIG_LIVEPATCH */ 38 39 #endif /* _ASM_POWERPC_LIVEPATCH_H */ 40