1/* SPDX-License-Identifier: GPL-2.0+ */
 2#ifndef _ASM_S390_KPROBES_H
 3#define _ASM_S390_KPROBES_H
 4/*
 5 *  Kernel Probes (KProbes)
 6 *
 7 * Copyright IBM Corp. 2002, 2006
 8 *
 9 * 2002-Oct	Created by Vamsi Krishna S <vamsi_krishna@in.ibm.com> Kernel
10 *		Probes initial implementation ( includes suggestions from
11 *		Rusty Russell).
12 * 2004-Nov	Modified for PPC64 by Ananth N Mavinakayanahalli
13 *		<ananth@in.ibm.com>
14 * 2005-Dec	Used as a template for s390 by Mike Grundy
15 *		<grundym@us.ibm.com>
16 */
17#include <linux/types.h>
18#include <asm-generic/kprobes.h>
19
20#define BREAKPOINT_INSTRUCTION	0x0002
21
22#define FIXUP_PSW_NORMAL	0x08
23#define FIXUP_BRANCH_NOT_TAKEN	0x04
24#define FIXUP_RETURN_REGISTER	0x02
25#define FIXUP_NOT_REQUIRED	0x01
26
27int probe_is_prohibited_opcode(u16 *insn);
28int probe_get_fixup_type(u16 *insn);
29int probe_is_insn_relative_long(u16 *insn);
30
31#ifdef CONFIG_KPROBES
32#include <linux/ptrace.h>
33#include <linux/percpu.h>
34#include <linux/sched/task_stack.h>
35
36#define __ARCH_WANT_KPROBES_INSN_SLOT
37
38struct pt_regs;
39struct kprobe;
40
41typedef u16 kprobe_opcode_t;
42
43/* Maximum instruction size is 3 (16bit) halfwords: */
44#define MAX_INSN_SIZE		0x0003
45#define MAX_STACK_SIZE		64
46#define MIN_STACK_SIZE(ADDR) (((MAX_STACK_SIZE) < \
47	(((unsigned long)task_stack_page(current)) + THREAD_SIZE - (ADDR))) \
48	? (MAX_STACK_SIZE) \
49	: (((unsigned long)task_stack_page(current)) + THREAD_SIZE - (ADDR)))
50
51#define kretprobe_blacklist_size 0
52
53/* Architecture specific copy of original instruction */
54struct arch_specific_insn {
55	/* copy of original instruction */
56	kprobe_opcode_t *insn;
57};
58
59struct prev_kprobe {
60	struct kprobe *kp;
61	unsigned long status;
62};
63
64/* per-cpu kprobe control block */
65struct kprobe_ctlblk {
66	unsigned long kprobe_status;
67	unsigned long kprobe_saved_imask;
68	unsigned long kprobe_saved_ctl[3];
69	struct prev_kprobe prev_kprobe;
70};
71
72void arch_remove_kprobe(struct kprobe *p);
73void kretprobe_trampoline(void);
74
75int kprobe_fault_handler(struct pt_regs *regs, int trapnr);
76int kprobe_exceptions_notify(struct notifier_block *self,
77	unsigned long val, void *data);
78
79#define flush_insn_slot(p)	do { } while (0)
80
81#endif /* CONFIG_KPROBES */
82#endif	/* _ASM_S390_KPROBES_H */