/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * arch/arm/include/asm/kprobes.h
 *
 * Copyright (C) 2006, 2007 Motorola Inc.
 */

#ifndef _ARM_KPROBES_H
#define _ARM_KPROBES_H

#include <asm-generic/kprobes.h>

#ifdef CONFIG_KPROBES
#include <linux/types.h>
#include <linux/ptrace.h>
#include <linux/notifier.h>

#define __ARCH_WANT_KPROBES_INSN_SLOT
#define MAX_INSN_SIZE                   2

#define flush_insn_slot(p)              do { } while (0)
#define kretprobe_blacklist_size        0

typedef u32 kprobe_opcode_t;
struct kprobe;
#include <asm/probes.h>

#define arch_specific_insn      arch_probes_insn

struct prev_kprobe {
        struct kprobe *kp;
        unsigned int status;
};

/* per-cpu kprobe control block */
struct kprobe_ctlblk {
        unsigned int kprobe_status;
        struct prev_kprobe prev_kprobe;
};

void arch_remove_kprobe(struct kprobe *);
int kprobe_fault_handler(struct pt_regs *regs, unsigned int fsr);

/* optinsn template addresses */
extern __visible kprobe_opcode_t optprobe_template_entry[];
extern __visible kprobe_opcode_t optprobe_template_val[];
extern __visible kprobe_opcode_t optprobe_template_call[];
extern __visible kprobe_opcode_t optprobe_template_end[];
extern __visible kprobe_opcode_t optprobe_template_sub_sp[];
extern __visible kprobe_opcode_t optprobe_template_add_sp[];
extern __visible kprobe_opcode_t optprobe_template_restore_begin[];
extern __visible kprobe_opcode_t optprobe_template_restore_orig_insn[];
extern __visible kprobe_opcode_t optprobe_template_restore_end[];

#define MAX_OPTIMIZED_LENGTH    4
#define MAX_OPTINSN_SIZE                                \
        ((unsigned long)optprobe_template_end - \
         (unsigned long)optprobe_template_entry)
#define RELATIVEJUMP_SIZE       4

struct arch_optimized_insn {
        /*
         * copy of the original instructions.
         * Different from x86, ARM kprobe_opcode_t is u32.
         */
#define MAX_COPIED_INSN DIV_ROUND_UP(RELATIVEJUMP_SIZE, sizeof(kprobe_opcode_t))
        kprobe_opcode_t copied_insn[MAX_COPIED_INSN];
        /* detour code buffer */
        kprobe_opcode_t *insn;
        /*
         * We always copy one instruction on ARM,
         * so size will always be 4, and unlike x86, there is no
         * need for a size field.
         */
};

#endif /* CONFIG_KPROBES */
#endif /* _ARM_KPROBES_H */