1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0-or-later */ 2*4882a593Smuzhiyun /* 3*4882a593Smuzhiyun * livepatch.h - powerpc-specific Kernel Live Patching Core 4*4882a593Smuzhiyun * 5*4882a593Smuzhiyun * Copyright (C) 2015-2016, SUSE, IBM Corp. 6*4882a593Smuzhiyun */ 7*4882a593Smuzhiyun #ifndef _ASM_POWERPC_LIVEPATCH_H 8*4882a593Smuzhiyun #define _ASM_POWERPC_LIVEPATCH_H 9*4882a593Smuzhiyun 10*4882a593Smuzhiyun #include <linux/module.h> 11*4882a593Smuzhiyun #include <linux/ftrace.h> 12*4882a593Smuzhiyun #include <linux/sched/task_stack.h> 13*4882a593Smuzhiyun 14*4882a593Smuzhiyun #ifdef CONFIG_LIVEPATCH klp_arch_set_pc(struct pt_regs * regs,unsigned long ip)15*4882a593Smuzhiyunstatic inline void klp_arch_set_pc(struct pt_regs *regs, unsigned long ip) 16*4882a593Smuzhiyun { 17*4882a593Smuzhiyun regs->nip = ip; 18*4882a593Smuzhiyun } 19*4882a593Smuzhiyun 20*4882a593Smuzhiyun #define klp_get_ftrace_location klp_get_ftrace_location klp_get_ftrace_location(unsigned long faddr)21*4882a593Smuzhiyunstatic inline unsigned long klp_get_ftrace_location(unsigned long faddr) 22*4882a593Smuzhiyun { 23*4882a593Smuzhiyun /* 24*4882a593Smuzhiyun * Live patch works only with -mprofile-kernel on PPC. In this case, 25*4882a593Smuzhiyun * the ftrace location is always within the first 16 bytes. 26*4882a593Smuzhiyun */ 27*4882a593Smuzhiyun return ftrace_location_range(faddr, faddr + 16); 28*4882a593Smuzhiyun } 29*4882a593Smuzhiyun klp_init_thread_info(struct task_struct * p)30*4882a593Smuzhiyunstatic inline void klp_init_thread_info(struct task_struct *p) 31*4882a593Smuzhiyun { 32*4882a593Smuzhiyun /* + 1 to account for STACK_END_MAGIC */ 33*4882a593Smuzhiyun task_thread_info(p)->livepatch_sp = end_of_stack(p) + 1; 34*4882a593Smuzhiyun } 35*4882a593Smuzhiyun #else klp_init_thread_info(struct task_struct * p)36*4882a593Smuzhiyunstatic inline void klp_init_thread_info(struct task_struct *p) { } 37*4882a593Smuzhiyun #endif /* CONFIG_LIVEPATCH */ 38*4882a593Smuzhiyun 39*4882a593Smuzhiyun #endif /* _ASM_POWERPC_LIVEPATCH_H */ 40