/*
 * livepatch.h - x86-specific Kernel Live Patching Core
 *
 * Copyright (C) 2014 Seth Jennings <sjenning@redhat.com>
 * Copyright (C) 2014 SUSE
 *
 * 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_X86_LIVEPATCH_H
#define _ASM_X86_LIVEPATCH_H

#include <asm/setup.h>
#include <linux/ftrace.h>

#ifdef CONFIG_LIVEPATCH
static inline int klp_check_compiler_support(void)
{
#if defined(CONFIG_LIVEPATCH_FTRACE) && !defined(CC_USING_FENTRY)
	return 1;
#endif
	return 0;
}

#ifdef CONFIG_LIVEPATCH_FTRACE
static inline void klp_arch_set_pc(struct pt_regs *regs, unsigned long ip)
{
	regs->ip = ip;
}

static inline unsigned long klp_arch_stub_ip(unsigned long addr)
{
	return addr;
}
#else /* CONFIG_LIVEPATCH_WO_FTRACE */
#define klp_smp_isb()

static inline void klp_arch_set_pc(struct pt_regs *regs, unsigned long ip)
{
	BUG();
}

static inline unsigned long klp_arch_stub_ip(unsigned long addr)
{
	BUG();
	return 0;
}

struct klp_patch;
struct klp_func;
int arch_klp_patch_func(struct klp_func *func);
void arch_klp_unpatch_func(struct klp_func *func);
int klp_check_calltrace(struct klp_patch *patch, int enable);
#endif

#else
#error Live patching support is disabled; check CONFIG_LIVEPATCH
#endif

#endif /* _ASM_X86_LIVEPATCH_H */