1/* SPDX-License-Identifier: GPL-2.0-or-later */
2#ifndef _ASM_POWERPC_KPROBES_H
3#define _ASM_POWERPC_KPROBES_H
4
5#include <asm-generic/kprobes.h>
6
7#ifdef __KERNEL__
8/*
9 *  Kernel Probes (KProbes)
10 *
11 * Copyright (C) IBM Corporation, 2002, 2004
12 *
13 * 2002-Oct	Created by Vamsi Krishna S <vamsi_krishna@in.ibm.com> Kernel
14 *		Probes initial implementation ( includes suggestions from
15 *		Rusty Russell).
16 * 2004-Nov	Modified for PPC64 by Ananth N Mavinakayanahalli
17 *		<ananth@in.ibm.com>
18 */
19#include <linux/types.h>
20#include <linux/ptrace.h>
21#include <linux/percpu.h>
22#include <linux/module.h>
23#include <asm/probes.h>
24#include <asm/code-patching.h>
25
26#ifdef CONFIG_KPROBES
27#define  __ARCH_WANT_KPROBES_INSN_SLOT
28
29struct pt_regs;
30struct kprobe;
31
32typedef u32 kprobe_opcode_t;
33
34extern kprobe_opcode_t optinsn_slot;
35
36/* Optinsn template address */
37extern kprobe_opcode_t optprobe_template_entry[];
38extern kprobe_opcode_t optprobe_template_op_address[];
39extern kprobe_opcode_t optprobe_template_call_handler[];
40extern kprobe_opcode_t optprobe_template_insn[];
41extern kprobe_opcode_t optprobe_template_call_emulate[];
42extern kprobe_opcode_t optprobe_template_ret[];
43extern kprobe_opcode_t optprobe_template_end[];
44
45/* Fixed instruction size for powerpc */
46#define MAX_INSN_SIZE		2
47#define MAX_OPTIMIZED_LENGTH	sizeof(kprobe_opcode_t)	/* 4 bytes */
48#define MAX_OPTINSN_SIZE	(optprobe_template_end - optprobe_template_entry)
49#define RELATIVEJUMP_SIZE	sizeof(kprobe_opcode_t)	/* 4 bytes */
50
51#define flush_insn_slot(p)	do { } while (0)
52#define kretprobe_blacklist_size 0
53
54void __kretprobe_trampoline(void);
55extern void arch_remove_kprobe(struct kprobe *p);
56
57/* Architecture specific copy of original instruction */
58struct arch_specific_insn {
59	/* copy of original instruction */
60	kprobe_opcode_t *insn;
61	/*
62	 * Set in kprobes code, initially to 0. If the instruction can be
63	 * eumulated, this is set to 1, if not, to -1.
64	 */
65	int boostable;
66};
67
68struct prev_kprobe {
69	struct kprobe *kp;
70	unsigned long status;
71	unsigned long saved_msr;
72};
73
74/* per-cpu kprobe control block */
75struct kprobe_ctlblk {
76	unsigned long kprobe_status;
77	unsigned long kprobe_saved_msr;
78	struct prev_kprobe prev_kprobe;
79};
80
81struct arch_optimized_insn {
82	kprobe_opcode_t copied_insn[1];
83	/* detour buffer */
84	kprobe_opcode_t *insn;
85};
86
87extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr);
88extern int kprobe_handler(struct pt_regs *regs);
89extern int kprobe_post_handler(struct pt_regs *regs);
90#else
91static inline int kprobe_handler(struct pt_regs *regs) { return 0; }
92static inline int kprobe_post_handler(struct pt_regs *regs) { return 0; }
93#endif /* CONFIG_KPROBES */
94#endif /* __KERNEL__ */
95#endif	/* _ASM_POWERPC_KPROBES_H */
96