/* * livepatch.h - powerpc-specific Kernel Live Patching Core * * Copyright (C) 2015-2016, SUSE, IBM Corp. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, see <http://www.gnu.org/licenses/>. */ #ifndef _ASM_POWERPC_LIVEPATCH_H #define _ASM_POWERPC_LIVEPATCH_H #include <linux/module.h> #include <linux/ftrace.h> #ifdef [31mCONFIG_LIVEPATCH[0m static inline int klp_check_compiler_support(void) { return 0; } static inline int klp_write_module_reloc(struct module *mod, unsigned long type, unsigned long loc, unsigned long value) { /* This requires infrastructure changes; we need the loadinfos. */ return -ENOSYS; } static inline void klp_arch_set_pc(struct pt_regs *regs, unsigned long ip) { regs->nip = 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 thread_info *ti) { /* + 1 to account for STACK_END_MAGIC */ ti->livepatch_sp = (unsigned long *)(ti + 1) + 1; } #else static void klp_init_thread_info(struct thread_info *ti) { } #endif /* CONFIG_LIVEPATCH */ #endif /* _ASM_POWERPC_LIVEPATCH_H */ |