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 ftrace_regs *fregs, unsigned long ip) 16 { 17 struct pt_regs *regs = ftrace_get_regs(fregs); 18 19 regs_set_return_ip(regs, ip); 20 } 21 22 #define klp_get_ftrace_location klp_get_ftrace_location 23 static inline unsigned long klp_get_ftrace_location(unsigned long faddr) 24 { 25 /* 26 * Live patch works only with -mprofile-kernel on PPC. In this case, 27 * the ftrace location is always within the first 16 bytes. 28 */ 29 return ftrace_location_range(faddr, faddr + 16); 30 } 31 32 static inline void klp_init_thread_info(struct task_struct *p) 33 { 34 /* + 1 to account for STACK_END_MAGIC */ 35 task_thread_info(p)->livepatch_sp = end_of_stack(p) + 1; 36 } 37 #else 38 static inline void klp_init_thread_info(struct task_struct *p) { } 39 #endif /* CONFIG_LIVEPATCH */ 40 41 #endif /* _ASM_POWERPC_LIVEPATCH_H */ 42