2021-05-26 19:09:36 +00:00
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/* SPDX-License-Identifier: GPL-2.0-or-later */
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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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#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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#include <linux/sched/task_stack.h>
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#ifdef CONFIG_LIVEPATCH
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static inline void klp_arch_set_pc(struct ftrace_regs *fregs, unsigned long ip)
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{
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struct pt_regs *regs = ftrace_get_regs(fregs);
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2021-07-20 16:20:39 +00:00
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regs_set_return_ip(regs, ip);
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2021-05-26 19:09:36 +00:00
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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 task_struct *p)
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{
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/* + 1 to account for STACK_END_MAGIC */
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task_thread_info(p)->livepatch_sp = end_of_stack(p) + 1;
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}
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#else
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static inline void klp_init_thread_info(struct task_struct *p) { }
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#endif /* CONFIG_LIVEPATCH */
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#endif /* _ASM_POWERPC_LIVEPATCH_H */
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