/arch/s390/include/asm/kprobes.h

  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 kretprobe_blacklist_size 0
 50
 51#define KPROBE_SWAP_INST	0x10
 52
 53#define FIXUP_PSW_NORMAL	0x08
 54#define FIXUP_BRANCH_NOT_TAKEN	0x04
 55#define FIXUP_RETURN_REGISTER	0x02
 56#define FIXUP_NOT_REQUIRED	0x01
 57
 58/* Architecture specific copy of original instruction */
 59struct arch_specific_insn {
 60	/* copy of original instruction */
 61	kprobe_opcode_t *insn;
 62	int fixup;
 63	int ilen;
 64	int reg;
 65};
 66
 67struct ins_replace_args {
 68	kprobe_opcode_t *ptr;
 69	kprobe_opcode_t old;
 70	kprobe_opcode_t new;
 71};
 72struct prev_kprobe {
 73	struct kprobe *kp;
 74	unsigned long status;
 75	unsigned long saved_psw;
 76	unsigned long kprobe_saved_imask;
 77	unsigned long kprobe_saved_ctl[3];
 78};
 79
 80/* per-cpu kprobe control block */
 81struct kprobe_ctlblk {
 82	unsigned long kprobe_status;
 83	unsigned long kprobe_saved_imask;
 84	unsigned long kprobe_saved_ctl[3];
 85	struct pt_regs jprobe_saved_regs;
 86	unsigned long jprobe_saved_r14;
 87	unsigned long jprobe_saved_r15;
 88	struct prev_kprobe prev_kprobe;
 89	kprobe_opcode_t jprobes_stack[MAX_STACK_SIZE];
 90};
 91
 92void arch_remove_kprobe(struct kprobe *p);
 93void kretprobe_trampoline(void);
 94int  is_prohibited_opcode(kprobe_opcode_t *instruction);
 95void get_instruction_type(struct arch_specific_insn *ainsn);
 96
 97int kprobe_fault_handler(struct pt_regs *regs, int trapnr);
 98int kprobe_exceptions_notify(struct notifier_block *self,
 99	unsigned long val, void *data);
100
101#define flush_insn_slot(p)	do { } while (0)
102
103#endif	/* _ASM_S390_KPROBES_H */