#ifndef _ASM_S390_KPROBES_H
  #define _ASM_S390_KPROBES_H
  /*
   *  Kernel Probes (KProbes)
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License as published by
   * the Free Software Foundation; either version 2 of the License, or
   * (at your option) any later version.
   *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program; if not, write to the Free Software
   * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
   *
   * Copyright (C) IBM Corporation, 2002, 2006
   *
   * 2002-Oct	Created by Vamsi Krishna S <vamsi_krishna@in.ibm.com> Kernel
   *		Probes initial implementation ( includes suggestions from
   *		Rusty Russell).
   * 2004-Nov	Modified for PPC64 by Ananth N Mavinakayanahalli
   *		<ananth@in.ibm.com>
   * 2005-Dec	Used as a template for s390 by Mike Grundy
   *		<grundym@us.ibm.com>
   */
  #include <linux/types.h>
  #include <linux/ptrace.h>
  #include <linux/percpu.h>
  
  #define  __ARCH_WANT_KPROBES_INSN_SLOT
  struct pt_regs;
  struct kprobe;
  
  typedef u16 kprobe_opcode_t;
  #define BREAKPOINT_INSTRUCTION	0x0002
  
  /* Maximum instruction size is 3 (16bit) halfwords: */
  #define MAX_INSN_SIZE		0x0003
  #define MAX_STACK_SIZE		64
  #define MIN_STACK_SIZE(ADDR) (((MAX_STACK_SIZE) < \
  	(((unsigned long)current_thread_info()) + THREAD_SIZE - (ADDR))) \
  	? (MAX_STACK_SIZE) \
  	: (((unsigned long)current_thread_info()) + THREAD_SIZE - (ADDR)))
  
  #define JPROBE_ENTRY(pentry) (kprobe_opcode_t *)(pentry)
  
  #define ARCH_SUPPORTS_KRETPROBES
  #define ARCH_INACTIVE_KPROBE_COUNT 0
  
  #define KPROBE_SWAP_INST	0x10
  
  #define FIXUP_PSW_NORMAL	0x08
  #define FIXUP_BRANCH_NOT_TAKEN	0x04
  #define FIXUP_RETURN_REGISTER	0x02
  #define FIXUP_NOT_REQUIRED	0x01
  
  /* Architecture specific copy of original instruction */
  struct arch_specific_insn {
  	/* copy of original instruction */
  	kprobe_opcode_t *insn;
  	int fixup;
  	int ilen;
  	int reg;
  };
  
  struct ins_replace_args {
  	kprobe_opcode_t *ptr;
  	kprobe_opcode_t old;
  	kprobe_opcode_t new;
  };
  struct prev_kprobe {
  	struct kprobe *kp;
  	unsigned long status;
  	unsigned long saved_psw;
  	unsigned long kprobe_saved_imask;
  	unsigned long kprobe_saved_ctl[3];
  };
  
  /* per-cpu kprobe control block */
  struct kprobe_ctlblk {
  	unsigned long kprobe_status;
  	unsigned long kprobe_saved_imask;
  	unsigned long kprobe_saved_ctl[3];
  	struct pt_regs jprobe_saved_regs;
  	unsigned long jprobe_saved_r14;
  	unsigned long jprobe_saved_r15;
  	struct prev_kprobe prev_kprobe;
  	kprobe_opcode_t jprobes_stack[MAX_STACK_SIZE];
  };
  
  void arch_remove_kprobe(struct kprobe *p);
  void kretprobe_trampoline(void);
  int  is_prohibited_opcode(kprobe_opcode_t *instruction);
  void get_instruction_type(struct arch_specific_insn *ainsn);

  int kprobe_fault_handler(struct pt_regs *regs, int trapnr);
  int kprobe_exceptions_notify(struct notifier_block *self,
  	unsigned long val, void *data);

  #define flush_insn_slot(p)	do { } while (0)
  
  #endif	/* _ASM_S390_KPROBES_H */