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
28 int probe_is_prohibited_opcode(u16 *insn);
29 int probe_get_fixup_type(u16 *insn);
30 int 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
39 struct pt_regs;
40 struct kprobe;
41
42 typedef 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 */
55 struct arch_specific_insn {
56 /* copy of original instruction */
57 kprobe_opcode_t *insn;
58 };
59
60 struct prev_kprobe {
61 struct kprobe *kp;
62 unsigned long status;
63 };
64
65 /* per-cpu kprobe control block */
66 struct 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
73 void arch_remove_kprobe(struct kprobe *p);
74
75 int 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
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