/*

   * arch/arm/include/asm/kprobes.h

   *
   * Copyright (C) 2006, 2007 Motorola Inc.
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License version 2 as
   * published by the Free Software Foundation.
   *
   * 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.
   */
  
  #ifndef _ARM_KPROBES_H
  #define _ARM_KPROBES_H
  
  #include <linux/types.h>
  #include <linux/ptrace.h>

  #include <linux/percpu.h>

  #define __ARCH_WANT_KPROBES_INSN_SLOT
  #define MAX_INSN_SIZE			2
  #define MAX_STACK_SIZE			64	/* 32 would probably be OK */

  /*
   * This undefined instruction must be unique and
   * reserved solely for kprobes' use.
   */
  #define KPROBE_BREAKPOINT_INSTRUCTION	0xe7f001f8

  #define regs_return_value(regs)		((regs)->ARM_r0)
  #define flush_insn_slot(p)		do { } while (0)
  #define kretprobe_blacklist_size	0

  
  typedef u32 kprobe_opcode_t;
  
  struct kprobe;
  typedef void (kprobe_insn_handler_t)(struct kprobe *, struct pt_regs *);
  
  /* Architecture specific copy of original instruction. */
  struct arch_specific_insn {
  	kprobe_opcode_t		*insn;
  	kprobe_insn_handler_t	*insn_handler;
  };

  struct prev_kprobe {
  	struct kprobe *kp;
  	unsigned int status;
  };
  
  /* per-cpu kprobe control block */
  struct kprobe_ctlblk {
  	unsigned int kprobe_status;
  	struct prev_kprobe prev_kprobe;
  	struct pt_regs jprobe_saved_regs;
  	char jprobes_stack[MAX_STACK_SIZE];
  };
  
  void arch_remove_kprobe(struct kprobe *);

  void kretprobe_trampoline(void);

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

  enum kprobe_insn {
  	INSN_REJECTED,
  	INSN_GOOD,
  	INSN_GOOD_NO_SLOT
  };
  
  enum kprobe_insn arm_kprobe_decode_insn(kprobe_opcode_t,
  					struct arch_specific_insn *);
  void __init arm_kprobe_decode_init(void);
  
  #endif /* _ARM_KPROBES_H */