arch/mn10300/kernel/ptrace.c - maze/linux - Git at Google

 /* MN10300 Process tracing
  *
  * Copyright (C) 2007 Matsushita Electric Industrial Co., Ltd.
  * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
  * Modified by David Howells (dhowells@redhat.com)
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public Licence
  * as published by the Free Software Foundation; either version
  * 2 of the Licence, or (at your option) any later version.
  */
 #include <linux/kernel.h>
 #include <linux/sched.h>
 #include <linux/mm.h>
 #include <linux/smp.h>
 #include <linux/errno.h>
 #include <linux/ptrace.h>
 #include <linux/user.h>
 #include <linux/regset.h>
 #include <linux/elf.h>
 #include <linux/tracehook.h>
 #include <asm/uaccess.h>
 #include <asm/pgtable.h>
 #include <asm/processor.h>
 #include <asm/cacheflush.h>
 #include <asm/fpu.h>
 #include <asm/asm-offsets.h>

 /*
  * translate ptrace register IDs into struct pt_regs offsets
  */
 static const u8 ptrace_regid_to_frame[] = {
 	[PT_A3 << 2]		= REG_A3,
 	[PT_A2 << 2]		= REG_A2,
 	[PT_D3 << 2]		= REG_D3,
 	[PT_D2 << 2]		= REG_D2,
 	[PT_MCVF << 2]		= REG_MCVF,
 	[PT_MCRL << 2]		= REG_MCRL,
 	[PT_MCRH << 2]		= REG_MCRH,
 	[PT_MDRQ << 2]		= REG_MDRQ,
 	[PT_E1 << 2]		= REG_E1,
 	[PT_E0 << 2]		= REG_E0,
 	[PT_E7 << 2]		= REG_E7,
 	[PT_E6 << 2]		= REG_E6,
 	[PT_E5 << 2]		= REG_E5,
 	[PT_E4 << 2]		= REG_E4,
 	[PT_E3 << 2]		= REG_E3,
 	[PT_E2 << 2]		= REG_E2,
 	[PT_SP << 2]		= REG_SP,
 	[PT_LAR << 2]		= REG_LAR,
 	[PT_LIR << 2]		= REG_LIR,
 	[PT_MDR << 2]		= REG_MDR,
 	[PT_A1 << 2]		= REG_A1,
 	[PT_A0 << 2]		= REG_A0,
 	[PT_D1 << 2]		= REG_D1,
 	[PT_D0 << 2]		= REG_D0,
 	[PT_ORIG_D0 << 2]	= REG_ORIG_D0,
 	[PT_EPSW << 2]		= REG_EPSW,
 	[PT_PC << 2]		= REG_PC,
 };

 static inline int get_stack_long(struct task_struct *task, int offset)
 {
 	return *(unsigned long *)
 		((unsigned long) task->thread.uregs + offset);
 }

 static inline
 int put_stack_long(struct task_struct *task, int offset, unsigned long data)
 {
 	unsigned long stack;

 	stack = (unsigned long) task->thread.uregs + offset;
 	*(unsigned long *) stack = data;
 	return 0;
 }

 /*
  * retrieve the contents of MN10300 userspace general registers
  */
 static int genregs_get(struct task_struct *target,
 		       const struct user_regset *regset,
 		       unsigned int pos, unsigned int count,
 		       void *kbuf, void __user *ubuf)
 {
 	const struct pt_regs *regs = task_pt_regs(target);
 	int ret;

 	/* we need to skip regs->next */
 	ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 				  regs, 0, PT_ORIG_D0 * sizeof(long));
 	if (ret < 0)
 		return ret;

 	ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 				  &regs->orig_d0, PT_ORIG_D0 * sizeof(long),
 				  NR_PTREGS * sizeof(long));
 	if (ret < 0)
 		return ret;

 	return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 					NR_PTREGS * sizeof(long), -1);
 }

 /*
  * update the contents of the MN10300 userspace general registers
  */
 static int genregs_set(struct task_struct *target,
 		       const struct user_regset *regset,
 		       unsigned int pos, unsigned int count,
 		       const void *kbuf, const void __user *ubuf)
 {
 	struct pt_regs *regs = task_pt_regs(target);
 	unsigned long tmp;
 	int ret;

 	/* we need to skip regs->next */
 	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 				 regs, 0, PT_ORIG_D0 * sizeof(long));
 	if (ret < 0)
 		return ret;

 	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 				 &regs->orig_d0, PT_ORIG_D0 * sizeof(long),
 				 PT_EPSW * sizeof(long));
 	if (ret < 0)
 		return ret;

 	/* we need to mask off changes to EPSW */
 	tmp = regs->epsw;
 	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 				 &tmp, PT_EPSW * sizeof(long),
 				 PT_PC * sizeof(long));
 	tmp &= EPSW_FLAG_V | EPSW_FLAG_C | EPSW_FLAG_N | EPSW_FLAG_Z;
 	tmp |= regs->epsw & ~(EPSW_FLAG_V | EPSW_FLAG_C | EPSW_FLAG_N |
 			      EPSW_FLAG_Z);
 	regs->epsw = tmp;

 	if (ret < 0)
 		return ret;

 	/* and finally load the PC */
 	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 				 &regs->pc, PT_PC * sizeof(long),
 				 NR_PTREGS * sizeof(long));

 	if (ret < 0)
 		return ret;

 	return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 					 NR_PTREGS * sizeof(long), -1);
 }

 /*
  * retrieve the contents of MN10300 userspace FPU registers
  */
 static int fpuregs_get(struct task_struct *target,
 		       const struct user_regset *regset,
 		       unsigned int pos, unsigned int count,
 		       void *kbuf, void __user *ubuf)
 {
 	const struct fpu_state_struct *fpregs = &target->thread.fpu_state;
 	int ret;

 	unlazy_fpu(target);

 	ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 				  fpregs, 0, sizeof(*fpregs));
 	if (ret < 0)
 		return ret;

 	return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 					sizeof(*fpregs), -1);
 }

 /*
  * update the contents of the MN10300 userspace FPU registers
  */
 static int fpuregs_set(struct task_struct *target,
 		       const struct user_regset *regset,
 		       unsigned int pos, unsigned int count,
 		       const void *kbuf, const void __user *ubuf)
 {
 	struct fpu_state_struct fpu_state = target->thread.fpu_state;
 	int ret;

 	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 				 &fpu_state, 0, sizeof(fpu_state));
 	if (ret < 0)
 		return ret;

 	fpu_kill_state(target);
 	target->thread.fpu_state = fpu_state;
 	set_using_fpu(target);

 	return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 					 sizeof(fpu_state), -1);
 }

 /*
  * determine if the FPU registers have actually been used
  */
 static int fpuregs_active(struct task_struct *target,
 			  const struct user_regset *regset)
 {
 	return is_using_fpu(target) ? regset->n : 0;
 }

 /*
  * Define the register sets available on the MN10300 under Linux
  */
 enum mn10300_regset {
 	REGSET_GENERAL,
 	REGSET_FPU,
 };

 static const struct user_regset mn10300_regsets[] = {
 	/*
 	 * General register format is:
 	 *	A3, A2, D3, D2, MCVF, MCRL, MCRH, MDRQ
 	 *	E1, E0, E7...E2, SP, LAR, LIR, MDR
 	 *	A1, A0, D1, D0, ORIG_D0, EPSW, PC
 	 */
 	[REGSET_GENERAL] = {
 		.core_note_type	= NT_PRSTATUS,
 		.n		= ELF_NGREG,
 		.size		= sizeof(long),
 		.align		= sizeof(long),
 		.get		= genregs_get,
 		.set		= genregs_set,
 	},
 	/*
 	 * FPU register format is:
 	 *	FS0-31, FPCR
 	 */
 	[REGSET_FPU] = {
 		.core_note_type	= NT_PRFPREG,
 		.n		= sizeof(struct fpu_state_struct) / sizeof(long),
 		.size		= sizeof(long),
 		.align		= sizeof(long),
 		.get		= fpuregs_get,
 		.set		= fpuregs_set,
 		.active		= fpuregs_active,
 	},
 };

 static const struct user_regset_view user_mn10300_native_view = {
 	.name		= "mn10300",
 	.e_machine	= EM_MN10300,
 	.regsets	= mn10300_regsets,
 	.n		= ARRAY_SIZE(mn10300_regsets),
 };

 const struct user_regset_view *task_user_regset_view(struct task_struct *task)
 {
 	return &user_mn10300_native_view;
 }

 /*
  * set the single-step bit
  */
 void user_enable_single_step(struct task_struct *child)
 {
 #ifndef CONFIG_MN10300_USING_JTAG
 	struct user *dummy = NULL;
 	long tmp;

 	tmp = get_stack_long(child, (unsigned long) &dummy->regs.epsw);
 	tmp |= EPSW_T;
 	put_stack_long(child, (unsigned long) &dummy->regs.epsw, tmp);
 #endif
 }

 /*
  * make sure the single-step bit is not set
  */
 void user_disable_single_step(struct task_struct *child)
 {
 #ifndef CONFIG_MN10300_USING_JTAG
 	struct user *dummy = NULL;
 	long tmp;

 	tmp = get_stack_long(child, (unsigned long) &dummy->regs.epsw);
 	tmp &= ~EPSW_T;
 	put_stack_long(child, (unsigned long) &dummy->regs.epsw, tmp);
 #endif
 }

 void ptrace_disable(struct task_struct *child)
 {
 	user_disable_single_step(child);
 }

 /*
  * handle the arch-specific side of process tracing
  */
 long arch_ptrace(struct task_struct *child, long request,
 		 unsigned long addr, unsigned long data)
 {
 	unsigned long tmp;
 	int ret;
 	unsigned long __user *datap = (unsigned long __user *) data;

 	switch (request) {
 	/* read the word at location addr in the USER area. */
 	case PTRACE_PEEKUSR:
 		ret = -EIO;
 		if ((addr & 3) || addr > sizeof(struct user) - 3)
 			break;

 		tmp = 0;  /* Default return condition */
 		if (addr < NR_PTREGS << 2)
 			tmp = get_stack_long(child,
 					     ptrace_regid_to_frame[addr]);
 		ret = put_user(tmp, datap);
 		break;

 		/* write the word at location addr in the USER area */
 	case PTRACE_POKEUSR:
 		ret = -EIO;
 		if ((addr & 3) || addr > sizeof(struct user) - 3)
 			break;

 		ret = 0;
 		if (addr < NR_PTREGS << 2)
 			ret = put_stack_long(child, ptrace_regid_to_frame[addr],
 					     data);
 		break;

 	case PTRACE_GETREGS:	/* Get all integer regs from the child. */
 		return copy_regset_to_user(child, &user_mn10300_native_view,
 					   REGSET_GENERAL,
 					   0, NR_PTREGS * sizeof(long),
 					   datap);

 	case PTRACE_SETREGS:	/* Set all integer regs in the child. */
 		return copy_regset_from_user(child, &user_mn10300_native_view,
 					     REGSET_GENERAL,
 					     0, NR_PTREGS * sizeof(long),
 					     datap);

 	case PTRACE_GETFPREGS:	/* Get the child FPU state. */
 		return copy_regset_to_user(child, &user_mn10300_native_view,
 					   REGSET_FPU,
 					   0, sizeof(struct fpu_state_struct),
 					   datap);

 	case PTRACE_SETFPREGS:	/* Set the child FPU state. */
 		return copy_regset_from_user(child, &user_mn10300_native_view,
 					     REGSET_FPU,
 					     0, sizeof(struct fpu_state_struct),
 					     datap);

 	default:
 		ret = ptrace_request(child, request, addr, data);
 		break;
 	}

 	return ret;
 }

 /*
  * handle tracing of system call entry
  * - return the revised system call number or ULONG_MAX to cause ENOSYS
  */
 asmlinkage unsigned long syscall_trace_entry(struct pt_regs *regs)
 {
 	if (tracehook_report_syscall_entry(regs))
 		/* tracing decided this syscall should not happen, so
 		 * We'll return a bogus call number to get an ENOSYS
 		 * error, but leave the original number in
 		 * regs->orig_d0
 		 */
 		return ULONG_MAX;

 	return regs->orig_d0;
 }

 /*
  * handle tracing of system call exit
  */
 asmlinkage void syscall_trace_exit(struct pt_regs *regs)
 {
 	tracehook_report_syscall_exit(regs, 0);
 }
	/* MN10300 Process tracing
	*
	* Copyright (C) 2007 Matsushita Electric Industrial Co., Ltd.
	* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
	* Modified by David Howells (dhowells@redhat.com)
	*
	* This program is free software; you can redistribute it and/or
	* modify it under the terms of the GNU General Public Licence
	* as published by the Free Software Foundation; either version
	* 2 of the Licence, or (at your option) any later version.
	*/
	#include <linux/kernel.h>
	#include <linux/sched.h>
	#include <linux/mm.h>
	#include <linux/smp.h>
	#include <linux/errno.h>
	#include <linux/ptrace.h>
	#include <linux/user.h>
	#include <linux/regset.h>
	#include <linux/elf.h>
	#include <linux/tracehook.h>
	#include <asm/uaccess.h>
	#include <asm/pgtable.h>
	#include <asm/processor.h>
	#include <asm/cacheflush.h>
	#include <asm/fpu.h>
	#include <asm/asm-offsets.h>

	/*
	* translate ptrace register IDs into struct pt_regs offsets
	*/
	static const u8 ptrace_regid_to_frame[] = {
	[PT_A3 << 2] = REG_A3,
	[PT_A2 << 2] = REG_A2,
	[PT_D3 << 2] = REG_D3,
	[PT_D2 << 2] = REG_D2,
	[PT_MCVF << 2] = REG_MCVF,
	[PT_MCRL << 2] = REG_MCRL,
	[PT_MCRH << 2] = REG_MCRH,
	[PT_MDRQ << 2] = REG_MDRQ,
	[PT_E1 << 2] = REG_E1,
	[PT_E0 << 2] = REG_E0,
	[PT_E7 << 2] = REG_E7,
	[PT_E6 << 2] = REG_E6,
	[PT_E5 << 2] = REG_E5,
	[PT_E4 << 2] = REG_E4,
	[PT_E3 << 2] = REG_E3,
	[PT_E2 << 2] = REG_E2,
	[PT_SP << 2] = REG_SP,
	[PT_LAR << 2] = REG_LAR,
	[PT_LIR << 2] = REG_LIR,
	[PT_MDR << 2] = REG_MDR,
	[PT_A1 << 2] = REG_A1,
	[PT_A0 << 2] = REG_A0,
	[PT_D1 << 2] = REG_D1,
	[PT_D0 << 2] = REG_D0,
	[PT_ORIG_D0 << 2] = REG_ORIG_D0,
	[PT_EPSW << 2] = REG_EPSW,
	[PT_PC << 2] = REG_PC,
	};

	static inline int get_stack_long(struct task_struct *task, int offset)
	{
	return (unsigned long )
	((unsigned long) task->thread.uregs + offset);
	}

	static inline
	int put_stack_long(struct task_struct *task, int offset, unsigned long data)
	{
	unsigned long stack;

	stack = (unsigned long) task->thread.uregs + offset;
	(unsigned long ) stack = data;
	return 0;
	}

	/*
	* retrieve the contents of MN10300 userspace general registers
	*/
	static int genregs_get(struct task_struct *target,
	const struct user_regset *regset,
	unsigned int pos, unsigned int count,
	void kbuf, void __user ubuf)
	{
	const struct pt_regs *regs = task_pt_regs(target);
	int ret;

	/* we need to skip regs->next */
	ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
	regs, 0, PT_ORIG_D0 * sizeof(long));
	if (ret < 0)
	return ret;

	ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
	&regs->orig_d0, PT_ORIG_D0 * sizeof(long),
	NR_PTREGS * sizeof(long));
	if (ret < 0)
	return ret;

	return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
	NR_PTREGS * sizeof(long), -1);
	}

	/*
	* update the contents of the MN10300 userspace general registers
	*/
	static int genregs_set(struct task_struct *target,
	const struct user_regset *regset,
	unsigned int pos, unsigned int count,
	const void kbuf, const void __user ubuf)
	{
	struct pt_regs *regs = task_pt_regs(target);
	unsigned long tmp;
	int ret;

	/* we need to skip regs->next */
	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
	regs, 0, PT_ORIG_D0 * sizeof(long));
	if (ret < 0)
	return ret;

	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
	&regs->orig_d0, PT_ORIG_D0 * sizeof(long),
	PT_EPSW * sizeof(long));
	if (ret < 0)
	return ret;

	/* we need to mask off changes to EPSW */
	tmp = regs->epsw;
	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
	&tmp, PT_EPSW * sizeof(long),
	PT_PC * sizeof(long));
	tmp &= EPSW_FLAG_V \| EPSW_FLAG_C \| EPSW_FLAG_N \| EPSW_FLAG_Z;
	tmp \|= regs->epsw & ~(EPSW_FLAG_V \| EPSW_FLAG_C \| EPSW_FLAG_N \|
	EPSW_FLAG_Z);
	regs->epsw = tmp;

	if (ret < 0)
	return ret;

	/* and finally load the PC */
	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
	&regs->pc, PT_PC * sizeof(long),
	NR_PTREGS * sizeof(long));

	if (ret < 0)
	return ret;

	return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
	NR_PTREGS * sizeof(long), -1);
	}

	/*
	* retrieve the contents of MN10300 userspace FPU registers
	*/
	static int fpuregs_get(struct task_struct *target,
	const struct user_regset *regset,
	unsigned int pos, unsigned int count,
	void kbuf, void __user ubuf)
	{
	const struct fpu_state_struct *fpregs = &target->thread.fpu_state;
	int ret;

	unlazy_fpu(target);

	ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
	fpregs, 0, sizeof(*fpregs));
	if (ret < 0)
	return ret;

	return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
	sizeof(*fpregs), -1);
	}

	/*
	* update the contents of the MN10300 userspace FPU registers
	*/
	static int fpuregs_set(struct task_struct *target,
	const struct user_regset *regset,
	unsigned int pos, unsigned int count,
	const void kbuf, const void __user ubuf)
	{
	struct fpu_state_struct fpu_state = target->thread.fpu_state;
	int ret;

	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
	&fpu_state, 0, sizeof(fpu_state));
	if (ret < 0)
	return ret;

	fpu_kill_state(target);
	target->thread.fpu_state = fpu_state;
	set_using_fpu(target);

	return user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
	sizeof(fpu_state), -1);
	}

	/*
	* determine if the FPU registers have actually been used
	*/
	static int fpuregs_active(struct task_struct *target,
	const struct user_regset *regset)
	{
	return is_using_fpu(target) ? regset->n : 0;
	}

	/*
	* Define the register sets available on the MN10300 under Linux
	*/
	enum mn10300_regset {
	REGSET_GENERAL,
	REGSET_FPU,
	};

	static const struct user_regset mn10300_regsets[] = {
	/*
	* General register format is:
	* A3, A2, D3, D2, MCVF, MCRL, MCRH, MDRQ
	* E1, E0, E7...E2, SP, LAR, LIR, MDR
	* A1, A0, D1, D0, ORIG_D0, EPSW, PC
	*/
	[REGSET_GENERAL] = {
	.core_note_type = NT_PRSTATUS,
	.n = ELF_NGREG,
	.size = sizeof(long),
	.align = sizeof(long),
	.get = genregs_get,
	.set = genregs_set,
	},
	/*
	* FPU register format is:
	* FS0-31, FPCR
	*/
	[REGSET_FPU] = {
	.core_note_type = NT_PRFPREG,
	.n = sizeof(struct fpu_state_struct) / sizeof(long),
	.size = sizeof(long),
	.align = sizeof(long),
	.get = fpuregs_get,
	.set = fpuregs_set,
	.active = fpuregs_active,
	},
	};

	static const struct user_regset_view user_mn10300_native_view = {
	.name = "mn10300",
	.e_machine = EM_MN10300,
	.regsets = mn10300_regsets,
	.n = ARRAY_SIZE(mn10300_regsets),
	};

	const struct user_regset_view task_user_regset_view(struct task_struct task)
	{
	return &user_mn10300_native_view;
	}

	/*
	* set the single-step bit
	*/
	void user_enable_single_step(struct task_struct *child)
	{
	#ifndef CONFIG_MN10300_USING_JTAG
	struct user *dummy = NULL;
	long tmp;

	tmp = get_stack_long(child, (unsigned long) &dummy->regs.epsw);
	tmp \|= EPSW_T;
	put_stack_long(child, (unsigned long) &dummy->regs.epsw, tmp);
	#endif
	}

	/*
	* make sure the single-step bit is not set
	*/
	void user_disable_single_step(struct task_struct *child)
	{
	#ifndef CONFIG_MN10300_USING_JTAG
	struct user *dummy = NULL;
	long tmp;

	tmp = get_stack_long(child, (unsigned long) &dummy->regs.epsw);
	tmp &= ~EPSW_T;
	put_stack_long(child, (unsigned long) &dummy->regs.epsw, tmp);
	#endif
	}

	void ptrace_disable(struct task_struct *child)
	{
	user_disable_single_step(child);
	}

	/*
	* handle the arch-specific side of process tracing
	*/
	long arch_ptrace(struct task_struct *child, long request,
	unsigned long addr, unsigned long data)
	{
	unsigned long tmp;
	int ret;
	unsigned long __user datap = (unsigned long __user ) data;

	switch (request) {
	/* read the word at location addr in the USER area. */
	case PTRACE_PEEKUSR:
	ret = -EIO;
	if ((addr & 3) \|\| addr > sizeof(struct user) - 3)
	break;

	tmp = 0; /* Default return condition */
	if (addr < NR_PTREGS << 2)
	tmp = get_stack_long(child,
	ptrace_regid_to_frame[addr]);
	ret = put_user(tmp, datap);
	break;

	/* write the word at location addr in the USER area */
	case PTRACE_POKEUSR:
	ret = -EIO;
	if ((addr & 3) \|\| addr > sizeof(struct user) - 3)
	break;

	ret = 0;
	if (addr < NR_PTREGS << 2)
	ret = put_stack_long(child, ptrace_regid_to_frame[addr],
	data);
	break;

	case PTRACE_GETREGS: /* Get all integer regs from the child. */
	return copy_regset_to_user(child, &user_mn10300_native_view,
	REGSET_GENERAL,
	0, NR_PTREGS * sizeof(long),
	datap);

	case PTRACE_SETREGS: /* Set all integer regs in the child. */
	return copy_regset_from_user(child, &user_mn10300_native_view,
	REGSET_GENERAL,
	0, NR_PTREGS * sizeof(long),
	datap);

	case PTRACE_GETFPREGS: /* Get the child FPU state. */
	return copy_regset_to_user(child, &user_mn10300_native_view,
	REGSET_FPU,
	0, sizeof(struct fpu_state_struct),
	datap);

	case PTRACE_SETFPREGS: /* Set the child FPU state. */
	return copy_regset_from_user(child, &user_mn10300_native_view,
	REGSET_FPU,
	0, sizeof(struct fpu_state_struct),
	datap);

	default:
	ret = ptrace_request(child, request, addr, data);
	break;
	}

	return ret;
	}

	/*
	* handle tracing of system call entry
	* - return the revised system call number or ULONG_MAX to cause ENOSYS
	*/
	asmlinkage unsigned long syscall_trace_entry(struct pt_regs *regs)
	{
	if (tracehook_report_syscall_entry(regs))
	/* tracing decided this syscall should not happen, so
	* We'll return a bogus call number to get an ENOSYS
	* error, but leave the original number in
	* regs->orig_d0
	*/
	return ULONG_MAX;

	return regs->orig_d0;
	}

	/*
	* handle tracing of system call exit
	*/
	asmlinkage void syscall_trace_exit(struct pt_regs *regs)
	{
	tracehook_report_syscall_exit(regs, 0);
	}