56 lines
1.7 KiB
C
56 lines
1.7 KiB
C
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/*
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* livepatch.h - powerpc-specific Kernel Live Patching Core
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*
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* Copyright (C) 2015-2016, SUSE, IBM Corp.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef _ASM_POWERPC_LIVEPATCH_H
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#define _ASM_POWERPC_LIVEPATCH_H
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#include <linux/module.h>
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#include <linux/ftrace.h>
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#ifdef CONFIG_LIVEPATCH
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static inline int klp_check_compiler_support(void)
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{
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return 0;
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}
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static inline void klp_arch_set_pc(struct pt_regs *regs, unsigned long ip)
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{
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regs->nip = ip;
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}
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#define klp_get_ftrace_location klp_get_ftrace_location
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static inline unsigned long klp_get_ftrace_location(unsigned long faddr)
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{
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/*
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* Live patch works only with -mprofile-kernel on PPC. In this case,
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* the ftrace location is always within the first 16 bytes.
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*/
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return ftrace_location_range(faddr, faddr + 16);
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}
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static inline void klp_init_thread_info(struct thread_info *ti)
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{
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/* + 1 to account for STACK_END_MAGIC */
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ti->livepatch_sp = (unsigned long *)(ti + 1) + 1;
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}
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#else
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static void klp_init_thread_info(struct thread_info *ti) { }
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#endif /* CONFIG_LIVEPATCH */
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#endif /* _ASM_POWERPC_LIVEPATCH_H */
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