#ifndef _LINUX_PTRACE_H
  #define _LINUX_PTRACE_H
  /* ptrace.h */
  /* structs and defines to help the user use the ptrace system call. */
  
  /* has the defines to get at the registers. */
  
  #define PTRACE_TRACEME		   0
  #define PTRACE_PEEKTEXT		   1
  #define PTRACE_PEEKDATA		   2
  #define PTRACE_PEEKUSR		   3
  #define PTRACE_POKETEXT		   4
  #define PTRACE_POKEDATA		   5
  #define PTRACE_POKEUSR		   6
  #define PTRACE_CONT		   7
  #define PTRACE_KILL		   8
  #define PTRACE_SINGLESTEP	   9

  #define PTRACE_ATTACH		  16
  #define PTRACE_DETACH		  17

  
  #define PTRACE_SYSCALL		  24
  
  /* 0x4200-0x4300 are reserved for architecture-independent additions.  */
  #define PTRACE_SETOPTIONS	0x4200
  #define PTRACE_GETEVENTMSG	0x4201
  #define PTRACE_GETSIGINFO	0x4202
  #define PTRACE_SETSIGINFO	0x4203

  /*
   * Generic ptrace interface that exports the architecture specific regsets
   * using the corresponding NT_* types (which are also used in the core dump).

   * Please note that the NT_PRSTATUS note type in a core dump contains a full
   * 'struct elf_prstatus'. But the user_regset for NT_PRSTATUS contains just the
   * elf_gregset_t that is the pr_reg field of 'struct elf_prstatus'. For all the
   * other user_regset flavors, the user_regset layout and the ELF core dump note
   * payload are exactly the same layout.

   *
   * This interface usage is as follows:
   *	struct iovec iov = { buf, len};
   *
   *	ret = ptrace(PTRACE_GETREGSET/PTRACE_SETREGSET, pid, NT_XXX_TYPE, &iov);
   *
   * On the successful completion, iov.len will be updated by the kernel,
   * specifying how much the kernel has written/read to/from the user's iov.buf.
   */
  #define PTRACE_GETREGSET	0x4204
  #define PTRACE_SETREGSET	0x4205

  /* options set using PTRACE_SETOPTIONS */
  #define PTRACE_O_TRACESYSGOOD	0x00000001
  #define PTRACE_O_TRACEFORK	0x00000002
  #define PTRACE_O_TRACEVFORK	0x00000004
  #define PTRACE_O_TRACECLONE	0x00000008
  #define PTRACE_O_TRACEEXEC	0x00000010
  #define PTRACE_O_TRACEVFORKDONE	0x00000020
  #define PTRACE_O_TRACEEXIT	0x00000040
  
  #define PTRACE_O_MASK		0x0000007f
  
  /* Wait extended result codes for the above trace options.  */
  #define PTRACE_EVENT_FORK	1
  #define PTRACE_EVENT_VFORK	2
  #define PTRACE_EVENT_CLONE	3
  #define PTRACE_EVENT_EXEC	4
  #define PTRACE_EVENT_VFORK_DONE	5
  #define PTRACE_EVENT_EXIT	6
  
  #include <asm/ptrace.h>
  
  #ifdef __KERNEL__
  /*
   * Ptrace flags

   *
   * The owner ship rules for task->ptrace which holds the ptrace
   * flags is simple.  When a task is running it owns it's task->ptrace
   * flags.  When the a task is stopped the ptracer owns task->ptrace.

   */
  
  #define PT_PTRACED	0x00000001
  #define PT_DTRACE	0x00000002	/* delayed trace (used on m68k, i386) */
  #define PT_TRACESYSGOOD	0x00000004
  #define PT_PTRACE_CAP	0x00000008	/* ptracer can follow suid-exec */
  #define PT_TRACE_FORK	0x00000010
  #define PT_TRACE_VFORK	0x00000020
  #define PT_TRACE_CLONE	0x00000040
  #define PT_TRACE_EXEC	0x00000080
  #define PT_TRACE_VFORK_DONE	0x00000100
  #define PT_TRACE_EXIT	0x00000200

  
  #define PT_TRACE_MASK	0x000003f4
  
  /* single stepping state bits (used on ARM and PA-RISC) */
  #define PT_SINGLESTEP_BIT	31
  #define PT_SINGLESTEP		(1<<PT_SINGLESTEP_BIT)
  #define PT_BLOCKSTEP_BIT	30
  #define PT_BLOCKSTEP		(1<<PT_BLOCKSTEP_BIT)
  
  #include <linux/compiler.h>		/* For unlikely.  */
  #include <linux/sched.h>		/* For struct task_struct.  */

  
  extern long arch_ptrace(struct task_struct *child, long request, long addr, long data);

  extern int ptrace_traceme(void);

  extern int ptrace_readdata(struct task_struct *tsk, unsigned long src, char __user *dst, int len);
  extern int ptrace_writedata(struct task_struct *tsk, char __user *src, unsigned long dst, int len);
  extern int ptrace_attach(struct task_struct *tsk);
  extern int ptrace_detach(struct task_struct *, unsigned int);
  extern void ptrace_disable(struct task_struct *);
  extern int ptrace_check_attach(struct task_struct *task, int kill);
  extern int ptrace_request(struct task_struct *child, long request, long addr, long data);
  extern void ptrace_notify(int exit_code);
  extern void __ptrace_link(struct task_struct *child,
  			  struct task_struct *new_parent);
  extern void __ptrace_unlink(struct task_struct *child);

  extern void exit_ptrace(struct task_struct *tracer);

  #define PTRACE_MODE_READ   1
  #define PTRACE_MODE_ATTACH 2
  /* Returns 0 on success, -errno on denial. */
  extern int __ptrace_may_access(struct task_struct *task, unsigned int mode);
  /* Returns true on success, false on denial. */
  extern bool ptrace_may_access(struct task_struct *task, unsigned int mode);

  static inline int ptrace_reparented(struct task_struct *child)
  {
  	return child->real_parent != child->parent;
  }

  static inline void ptrace_unlink(struct task_struct *child)
  {
  	if (unlikely(child->ptrace))
  		__ptrace_unlink(child);
  }

  int generic_ptrace_peekdata(struct task_struct *tsk, long addr, long data);

  int generic_ptrace_pokedata(struct task_struct *tsk, long addr, long data);

  /**
   * task_ptrace - return %PT_* flags that apply to a task
   * @task:	pointer to &task_struct in question
   *
   * Returns the %PT_* flags that apply to @task.
   */
  static inline int task_ptrace(struct task_struct *task)
  {
  	return task->ptrace;
  }
  
  /**
   * ptrace_event - possibly stop for a ptrace event notification
   * @mask:	%PT_* bit to check in @current->ptrace
   * @event:	%PTRACE_EVENT_* value to report if @mask is set
   * @message:	value for %PTRACE_GETEVENTMSG to return
   *
   * This checks the @mask bit to see if ptrace wants stops for this event.
   * If so we stop, reporting @event and @message to the ptrace parent.
   *
   * Returns nonzero if we did a ptrace notification, zero if not.
   *
   * Called without locks.
   */
  static inline int ptrace_event(int mask, int event, unsigned long message)
  {
  	if (mask && likely(!(current->ptrace & mask)))
  		return 0;
  	current->ptrace_message = message;
  	ptrace_notify((event << 8) | SIGTRAP);
  	return 1;
  }

  /**
   * ptrace_init_task - initialize ptrace state for a new child
   * @child:		new child task
   * @ptrace:		true if child should be ptrace'd by parent's tracer
   *
   * This is called immediately after adding @child to its parent's children
   * list.  @ptrace is false in the normal case, and true to ptrace @child.
   *
   * Called with current's siglock and write_lock_irq(&tasklist_lock) held.
   */
  static inline void ptrace_init_task(struct task_struct *child, bool ptrace)
  {
  	INIT_LIST_HEAD(&child->ptrace_entry);
  	INIT_LIST_HEAD(&child->ptraced);
  	child->parent = child->real_parent;
  	child->ptrace = 0;

  	if (unlikely(ptrace) && (current->ptrace & PT_PTRACED)) {

  		child->ptrace = current->ptrace;

  		__ptrace_link(child, current->parent);

  	}
  }

  /**
   * ptrace_release_task - final ptrace-related cleanup of a zombie being reaped
   * @task:	task in %EXIT_DEAD state
   *
   * Called with write_lock(&tasklist_lock) held.
   */
  static inline void ptrace_release_task(struct task_struct *task)
  {
  	BUG_ON(!list_empty(&task->ptraced));
  	ptrace_unlink(task);
  	BUG_ON(!list_empty(&task->ptrace_entry));
  }

  #ifndef force_successful_syscall_return
  /*
   * System call handlers that, upon successful completion, need to return a
   * negative value should call force_successful_syscall_return() right before
   * returning.  On architectures where the syscall convention provides for a
   * separate error flag (e.g., alpha, ia64, ppc{,64}, sparc{,64}, possibly
   * others), this macro can be used to ensure that the error flag will not get
   * set.  On architectures which do not support a separate error flag, the macro
   * is a no-op and the spurious error condition needs to be filtered out by some
   * other means (e.g., in user-level, by passing an extra argument to the
   * syscall handler, or something along those lines).
   */
  #define force_successful_syscall_return() do { } while (0)
  #endif

  /*
   * <asm/ptrace.h> should define the following things inside #ifdef __KERNEL__.
   *
   * These do-nothing inlines are used when the arch does not
   * implement single-step.  The kerneldoc comments are here
   * to document the interface for all arch definitions.
   */
  
  #ifndef arch_has_single_step
  /**
   * arch_has_single_step - does this CPU support user-mode single-step?
   *
   * If this is defined, then there must be function declarations or
   * inlines for user_enable_single_step() and user_disable_single_step().
   * arch_has_single_step() should evaluate to nonzero iff the machine
   * supports instruction single-step for user mode.
   * It can be a constant or it can test a CPU feature bit.
   */
  #define arch_has_single_step()		(0)
  
  /**
   * user_enable_single_step - single-step in user-mode task
   * @task: either current or a task stopped in %TASK_TRACED
   *
   * This can only be called when arch_has_single_step() has returned nonzero.
   * Set @task so that when it returns to user mode, it will trap after the

   * next single instruction executes.  If arch_has_block_step() is defined,
   * this must clear the effects of user_enable_block_step() too.

   */
  static inline void user_enable_single_step(struct task_struct *task)
  {
  	BUG();			/* This can never be called.  */
  }
  
  /**
   * user_disable_single_step - cancel user-mode single-step
   * @task: either current or a task stopped in %TASK_TRACED
   *

   * Clear @task of the effects of user_enable_single_step() and
   * user_enable_block_step().  This can be called whether or not either
   * of those was ever called on @task, and even if arch_has_single_step()
   * returned zero.

   */
  static inline void user_disable_single_step(struct task_struct *task)
  {
  }

  #else
  extern void user_enable_single_step(struct task_struct *);
  extern void user_disable_single_step(struct task_struct *);

  #endif	/* arch_has_single_step */

  #ifndef arch_has_block_step
  /**
   * arch_has_block_step - does this CPU support user-mode block-step?
   *
   * If this is defined, then there must be a function declaration or inline
   * for user_enable_block_step(), and arch_has_single_step() must be defined
   * too.  arch_has_block_step() should evaluate to nonzero iff the machine
   * supports step-until-branch for user mode.  It can be a constant or it
   * can test a CPU feature bit.
   */

  #define arch_has_block_step()		(0)

  
  /**
   * user_enable_block_step - step until branch in user-mode task
   * @task: either current or a task stopped in %TASK_TRACED
   *
   * This can only be called when arch_has_block_step() has returned nonzero,
   * and will never be called when single-instruction stepping is being used.
   * Set @task so that when it returns to user mode, it will trap after the
   * next branch or trap taken.
   */
  static inline void user_enable_block_step(struct task_struct *task)
  {
  	BUG();			/* This can never be called.  */
  }

  #else
  extern void user_enable_block_step(struct task_struct *);

  #endif	/* arch_has_block_step */

  #ifdef ARCH_HAS_USER_SINGLE_STEP_INFO
  extern void user_single_step_siginfo(struct task_struct *tsk,
  				struct pt_regs *regs, siginfo_t *info);
  #else
  static inline void user_single_step_siginfo(struct task_struct *tsk,
  				struct pt_regs *regs, siginfo_t *info)
  {
  	memset(info, 0, sizeof(*info));
  	info->si_signo = SIGTRAP;
  }
  #endif

  #ifndef arch_ptrace_stop_needed
  /**
   * arch_ptrace_stop_needed - Decide whether arch_ptrace_stop() should be called
   * @code:	current->exit_code value ptrace will stop with
   * @info:	siginfo_t pointer (or %NULL) for signal ptrace will stop with
   *
   * This is called with the siglock held, to decide whether or not it's
   * necessary to release the siglock and call arch_ptrace_stop() with the
   * same @code and @info arguments.  It can be defined to a constant if
   * arch_ptrace_stop() is never required, or always is.  On machines where
   * this makes sense, it should be defined to a quick test to optimize out
   * calling arch_ptrace_stop() when it would be superfluous.  For example,
   * if the thread has not been back to user mode since the last stop, the
   * thread state might indicate that nothing needs to be done.
   */
  #define arch_ptrace_stop_needed(code, info)	(0)
  #endif
  
  #ifndef arch_ptrace_stop
  /**
   * arch_ptrace_stop - Do machine-specific work before stopping for ptrace
   * @code:	current->exit_code value ptrace will stop with
   * @info:	siginfo_t pointer (or %NULL) for signal ptrace will stop with
   *
   * This is called with no locks held when arch_ptrace_stop_needed() has
   * just returned nonzero.  It is allowed to block, e.g. for user memory
   * access.  The arch can have machine-specific work to be done before
   * ptrace stops.  On ia64, register backing store gets written back to user
   * memory here.  Since this can be costly (requires dropping the siglock),
   * we only do it when the arch requires it for this particular stop, as
   * indicated by arch_ptrace_stop_needed().
   */
  #define arch_ptrace_stop(code, info)		do { } while (0)
  #endif

  extern int task_current_syscall(struct task_struct *target, long *callno,
  				unsigned long args[6], unsigned int maxargs,
  				unsigned long *sp, unsigned long *pc);

  #endif
  
  #endif