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/ctlreg.h>
19#include <asm-generic/kprobes.h>
20
21#define BREAKPOINT_INSTRUCTION	0x0002
22
23#define FIXUP_PSW_NORMAL	0x08
24#define FIXUP_BRANCH_NOT_TAKEN	0x04
25#define FIXUP_RETURN_REGISTER	0x02
26#define FIXUP_NOT_REQUIRED	0x01
27
28int probe_is_prohibited_opcode(u16 *insn);
29int probe_get_fixup_type(u16 *insn);
30int probe_is_insn_relative_long(u16 *insn);
31
32#ifdef CONFIG_KPROBES
33#include <linux/ptrace.h>
34#include <linux/percpu.h>
35#include <linux/sched/task_stack.h>
36
37#define __ARCH_WANT_KPROBES_INSN_SLOT
38
39struct pt_regs;
40struct kprobe;
41
42typedef u16 kprobe_opcode_t;
43
44/* Maximum instruction size is 3 (16bit) halfwords: */
45#define MAX_INSN_SIZE		0x0003
46#define MAX_STACK_SIZE		64
47#define MIN_STACK_SIZE(ADDR) (((MAX_STACK_SIZE) < \
48	(((unsigned long)task_stack_page(current)) + THREAD_SIZE - (ADDR))) \
49	? (MAX_STACK_SIZE) \
50	: (((unsigned long)task_stack_page(current)) + THREAD_SIZE - (ADDR)))
51
52#define kretprobe_blacklist_size 0
53
54/* Architecture specific copy of original instruction */
55struct arch_specific_insn {
56	/* copy of original instruction */
57	kprobe_opcode_t *insn;
58};
59
60struct prev_kprobe {
61	struct kprobe *kp;
62	unsigned long status;
63};
64
65/* per-cpu kprobe control block */
66struct kprobe_ctlblk {
67	unsigned long kprobe_status;
68	unsigned long kprobe_saved_imask;
69	struct ctlreg kprobe_saved_ctl[3];
70	struct prev_kprobe prev_kprobe;
71};
72
73void arch_remove_kprobe(struct kprobe *p);
74
75int kprobe_fault_handler(struct pt_regs *regs, int trapnr);
76
77#define flush_insn_slot(p)	do { } while (0)
78
79#endif /* CONFIG_KPROBES */
80#endif	/* _ASM_S390_KPROBES_H */
81