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gerrit-public.fairphone.software / kernel / msm-4.9 / 511105b3d7c2440ee84fc3f90d200569aac88162 / . / include / asm-s390 / kprobes.h
blob: 830fe4c4eea60a529975b7d78abc98388466fc88 [file] [log] [blame]
Michael Grundy4ba069b2006-09-20 15:58:39 +0200[diff] [blame]1#ifndef _ASM_S390_KPROBES_H
2#define _ASM_S390_KPROBES_H
3/*
4 * Kernel Probes (KProbes)
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19 *
20 * Copyright (C) IBM Corporation, 2002, 2006
21 *
22 * 2002-Oct Created by Vamsi Krishna S <vamsi_krishna@in.ibm.com> Kernel
23 * Probes initial implementation ( includes suggestions from
24 * Rusty Russell).
25 * 2004-Nov Modified for PPC64 by Ananth N Mavinakayanahalli
26 * <ananth@in.ibm.com>
27 * 2005-Dec Used as a template for s390 by Mike Grundy
28 * <grundym@us.ibm.com>
29 */
30#include <linux/types.h>
31#include <linux/ptrace.h>
32#include <linux/percpu.h>
33
34#define __ARCH_WANT_KPROBES_INSN_SLOT
35struct pt_regs;
36struct kprobe;
37
38typedef u16 kprobe_opcode_t;
39#define BREAKPOINT_INSTRUCTION 0x0002
40
41/* Maximum instruction size is 3 (16bit) halfwords: */
42#define MAX_INSN_SIZE 0x0003
43#define MAX_STACK_SIZE 64
44#define MIN_STACK_SIZE(ADDR) (((MAX_STACK_SIZE) < \
45 (((unsigned long)current_thread_info()) + THREAD_SIZE - (ADDR))) \
46 ? (MAX_STACK_SIZE) \
47 : (((unsigned long)current_thread_info()) + THREAD_SIZE - (ADDR)))
48
49#define JPROBE_ENTRY(pentry) (kprobe_opcode_t *)(pentry)
50
51#define ARCH_SUPPORTS_KRETPROBES
52#define ARCH_INACTIVE_KPROBE_COUNT 0
53
54#define KPROBE_SWAP_INST 0x10
55
56#define FIXUP_PSW_NORMAL 0x08
57#define FIXUP_BRANCH_NOT_TAKEN 0x04
58#define FIXUP_RETURN_REGISTER 0x02
59#define FIXUP_NOT_REQUIRED 0x01
60
61/* Architecture specific copy of original instruction */
62struct arch_specific_insn {
63 /* copy of original instruction */
64 kprobe_opcode_t *insn;
65 int fixup;
66 int ilen;
67 int reg;
68};
69
70struct ins_replace_args {
71 kprobe_opcode_t *ptr;
72 kprobe_opcode_t old;
73 kprobe_opcode_t new;
74};
75struct prev_kprobe {
76 struct kprobe *kp;
77 unsigned long status;
78 unsigned long saved_psw;
79 unsigned long kprobe_saved_imask;
80 unsigned long kprobe_saved_ctl[3];
81};
82
83/* per-cpu kprobe control block */
84struct kprobe_ctlblk {
85 unsigned long kprobe_status;
86 unsigned long kprobe_saved_imask;
87 unsigned long kprobe_saved_ctl[3];
88 struct pt_regs jprobe_saved_regs;
89 unsigned long jprobe_saved_r14;
90 unsigned long jprobe_saved_r15;
91 struct prev_kprobe prev_kprobe;
92 kprobe_opcode_t jprobes_stack[MAX_STACK_SIZE];
93};
94
95void arch_remove_kprobe(struct kprobe *p);
96void kretprobe_trampoline(void);
97int is_prohibited_opcode(kprobe_opcode_t *instruction);
98void get_instruction_type(struct arch_specific_insn *ainsn);
99
Christoph Hellwig33464e32007-05-04 18:47:46 +0200[diff] [blame]100int kprobe_fault_handler(struct pt_regs *regs, int trapnr);
101int kprobe_exceptions_notify(struct notifier_block *self,
102 unsigned long val, void *data);
103
Michael Grundy4ba069b2006-09-20 15:58:39 +0200[diff] [blame]104#define flush_insn_slot(p) do { } while (0)
105
106#endif /* _ASM_S390_KPROBES_H */