| /* SPDX-License-Identifier: GPL-2.0-or-later */ |
| /* |
| * livepatch.h - powerpc-specific Kernel Live Patching Core |
| * |
| * Copyright (C) 2015-2016, SUSE, IBM Corp. |
| */ |
| #ifndef _ASM_POWERPC_LIVEPATCH_H |
| #define _ASM_POWERPC_LIVEPATCH_H |
| |
| #include <linux/module.h> |
| #include <linux/ftrace.h> |
| #include <linux/sched/task_stack.h> |
| |
| #ifdef CONFIG_LIVEPATCH |
| static inline void klp_arch_set_pc(struct ftrace_regs *fregs, unsigned long ip) |
| { |
| struct pt_regs *regs = ftrace_get_regs(fregs); |
| |
| regs_set_return_ip(regs, ip); |
| } |
| |
| #define klp_get_ftrace_location klp_get_ftrace_location |
| static inline unsigned long klp_get_ftrace_location(unsigned long faddr) |
| { |
| /* |
| * Live patch works only with -mprofile-kernel on PPC. In this case, |
| * the ftrace location is always within the first 16 bytes. |
| */ |
| return ftrace_location_range(faddr, faddr + 16); |
| } |
| |
| static inline void klp_init_thread_info(struct task_struct *p) |
| { |
| /* + 1 to account for STACK_END_MAGIC */ |
| task_thread_info(p)->livepatch_sp = end_of_stack(p) + 1; |
| } |
| #else |
| static inline void klp_init_thread_info(struct task_struct *p) { } |
| #endif /* CONFIG_LIVEPATCH */ |
| |
| #endif /* _ASM_POWERPC_LIVEPATCH_H */ |
