arch/sh/kernel/ptrace_32.c - maze/linux - Git at Google

 /*
  * SuperH process tracing
  *
  * Copyright (C) 1999, 2000  Kaz Kojima & Niibe Yutaka
  * Copyright (C) 2002 - 2009  Paul Mundt
  *
  * Audit support by Yuichi Nakamura <ynakam@hitachisoft.jp>
  *
  * This file is subject to the terms and conditions of the GNU General Public
  * License.  See the file "COPYING" in the main directory of this archive
  * for more details.
  */
 #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/security.h>
 #include <linux/signal.h>
 #include <linux/io.h>
 #include <linux/audit.h>
 #include <linux/seccomp.h>
 #include <linux/tracehook.h>
 #include <linux/elf.h>
 #include <linux/regset.h>
 #include <linux/hw_breakpoint.h>
 #include <asm/uaccess.h>
 #include <asm/pgtable.h>
 #include <asm/system.h>
 #include <asm/processor.h>
 #include <asm/mmu_context.h>
 #include <asm/syscalls.h>
 #include <asm/fpu.h>

 #define CREATE_TRACE_POINTS
 #include <trace/events/syscalls.h>

 /*
  * This routine will get a word off of the process kernel stack.
  */
 static inline int get_stack_long(struct task_struct *task, int offset)
 {
 	unsigned char *stack;

 	stack = (unsigned char *)task_pt_regs(task);
 	stack += offset;
 	return (*((int *)stack));
 }

 /*
  * This routine will put a word on the process kernel stack.
  */
 static inline int put_stack_long(struct task_struct *task, int offset,
 				 unsigned long data)
 {
 	unsigned char *stack;

 	stack = (unsigned char *)task_pt_regs(task);
 	stack += offset;
 	*(unsigned long *) stack = data;
 	return 0;
 }

 void ptrace_triggered(struct perf_event *bp, int nmi,
 		      struct perf_sample_data *data, struct pt_regs *regs)
 {
 	struct perf_event_attr attr;

 	/*
 	 * Disable the breakpoint request here since ptrace has defined a
 	 * one-shot behaviour for breakpoint exceptions.
 	 */
 	attr = bp->attr;
 	attr.disabled = true;
 	modify_user_hw_breakpoint(bp, &attr);
 }

 static int set_single_step(struct task_struct *tsk, unsigned long addr)
 {
 	struct thread_struct *thread = &tsk->thread;
 	struct perf_event *bp;
 	struct perf_event_attr attr;

 	bp = thread->ptrace_bps[0];
 	if (!bp) {
 		ptrace_breakpoint_init(&attr);

 		attr.bp_addr = addr;
 		attr.bp_len = HW_BREAKPOINT_LEN_2;
 		attr.bp_type = HW_BREAKPOINT_R;

 		bp = register_user_hw_breakpoint(&attr, ptrace_triggered, tsk);
 		if (IS_ERR(bp))
 			return PTR_ERR(bp);

 		thread->ptrace_bps[0] = bp;
 	} else {
 		int err;

 		attr = bp->attr;
 		attr.bp_addr = addr;
 		err = modify_user_hw_breakpoint(bp, &attr);
 		if (unlikely(err))
 			return err;
 	}

 	return 0;
 }

 void user_enable_single_step(struct task_struct *child)
 {
 	unsigned long pc = get_stack_long(child, offsetof(struct pt_regs, pc));

 	set_tsk_thread_flag(child, TIF_SINGLESTEP);

 	set_single_step(child, pc);
 }

 void user_disable_single_step(struct task_struct *child)
 {
 	clear_tsk_thread_flag(child, TIF_SINGLESTEP);
 }

 /*
  * Called by kernel/ptrace.c when detaching..
  *
  * Make sure single step bits etc are not set.
  */
 void ptrace_disable(struct task_struct *child)
 {
 	user_disable_single_step(child);
 }

 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;

 	ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 				  regs->regs,
 				  0, 16 * sizeof(unsigned long));
 	if (!ret)
 		/* PC, PR, SR, GBR, MACH, MACL, TRA */
 		ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 					  &regs->pc,
 					  offsetof(struct pt_regs, pc),
 					  sizeof(struct pt_regs));
 	if (!ret)
 		ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 					       sizeof(struct pt_regs), -1);

 	return ret;
 }

 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);
 	int ret;

 	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 				 regs->regs,
 				 0, 16 * sizeof(unsigned long));
 	if (!ret && count > 0)
 		ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 					 &regs->pc,
 					 offsetof(struct pt_regs, pc),
 					 sizeof(struct pt_regs));
 	if (!ret)
 		ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 						sizeof(struct pt_regs), -1);

 	return ret;
 }

 #ifdef CONFIG_SH_FPU
 int fpregs_get(struct task_struct *target,
 	       const struct user_regset *regset,
 	       unsigned int pos, unsigned int count,
 	       void *kbuf, void __user *ubuf)
 {
 	int ret;

 	ret = init_fpu(target);
 	if (ret)
 		return ret;

 	if ((boot_cpu_data.flags & CPU_HAS_FPU))
 		return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 					   &target->thread.xstate->hardfpu, 0, -1);

 	return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 				   &target->thread.xstate->softfpu, 0, -1);
 }

 static int fpregs_set(struct task_struct *target,
 		       const struct user_regset *regset,
 		       unsigned int pos, unsigned int count,
 		       const void *kbuf, const void __user *ubuf)
 {
 	int ret;

 	ret = init_fpu(target);
 	if (ret)
 		return ret;

 	set_stopped_child_used_math(target);

 	if ((boot_cpu_data.flags & CPU_HAS_FPU))
 		return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 					  &target->thread.xstate->hardfpu, 0, -1);

 	return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 				  &target->thread.xstate->softfpu, 0, -1);
 }

 static int fpregs_active(struct task_struct *target,
 			 const struct user_regset *regset)
 {
 	return tsk_used_math(target) ? regset->n : 0;
 }
 #endif

 #ifdef CONFIG_SH_DSP
 static int dspregs_get(struct task_struct *target,
 		       const struct user_regset *regset,
 		       unsigned int pos, unsigned int count,
 		       void *kbuf, void __user *ubuf)
 {
 	const struct pt_dspregs *regs =
 		(struct pt_dspregs *)&target->thread.dsp_status.dsp_regs;
 	int ret;

 	ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, regs,
 				  0, sizeof(struct pt_dspregs));
 	if (!ret)
 		ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
 					       sizeof(struct pt_dspregs), -1);

 	return ret;
 }

 static int dspregs_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_dspregs *regs =
 		(struct pt_dspregs *)&target->thread.dsp_status.dsp_regs;
 	int ret;

 	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, regs,
 				 0, sizeof(struct pt_dspregs));
 	if (!ret)
 		ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
 						sizeof(struct pt_dspregs), -1);

 	return ret;
 }

 static int dspregs_active(struct task_struct *target,
 			  const struct user_regset *regset)
 {
 	struct pt_regs *regs = task_pt_regs(target);

 	return regs->sr & SR_DSP ? regset->n : 0;
 }
 #endif

 /*
  * These are our native regset flavours.
  */
 enum sh_regset {
 	REGSET_GENERAL,
 #ifdef CONFIG_SH_FPU
 	REGSET_FPU,
 #endif
 #ifdef CONFIG_SH_DSP
 	REGSET_DSP,
 #endif
 };

 static const struct user_regset sh_regsets[] = {
 	/*
 	 * Format is:
 	 *	R0 --> R15
 	 *	PC, PR, SR, GBR, MACH, MACL, TRA
 	 */
 	[REGSET_GENERAL] = {
 		.core_note_type	= NT_PRSTATUS,
 		.n		= ELF_NGREG,
 		.size		= sizeof(long),
 		.align		= sizeof(long),
 		.get		= genregs_get,
 		.set		= genregs_set,
 	},

 #ifdef CONFIG_SH_FPU
 	[REGSET_FPU] = {
 		.core_note_type	= NT_PRFPREG,
 		.n		= sizeof(struct user_fpu_struct) / sizeof(long),
 		.size		= sizeof(long),
 		.align		= sizeof(long),
 		.get		= fpregs_get,
 		.set		= fpregs_set,
 		.active		= fpregs_active,
 	},
 #endif

 #ifdef CONFIG_SH_DSP
 	[REGSET_DSP] = {
 		.n		= sizeof(struct pt_dspregs) / sizeof(long),
 		.size		= sizeof(long),
 		.align		= sizeof(long),
 		.get		= dspregs_get,
 		.set		= dspregs_set,
 		.active		= dspregs_active,
 	},
 #endif
 };

 static const struct user_regset_view user_sh_native_view = {
 	.name		= "sh",
 	.e_machine	= EM_SH,
 	.regsets	= sh_regsets,
 	.n		= ARRAY_SIZE(sh_regsets),
 };

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

 long arch_ptrace(struct task_struct *child, long request, long addr, long data)
 {
 	struct user * dummy = NULL;
 	unsigned long __user *datap = (unsigned long __user *)data;
 	int ret;

 	switch (request) {
 	/* read the word at location addr in the USER area. */
 	case PTRACE_PEEKUSR: {
 		unsigned long tmp;

 		ret = -EIO;
 		if ((addr & 3) || addr < 0 ||
 		    addr > sizeof(struct user) - 3)
 			break;

 		if (addr < sizeof(struct pt_regs))
 			tmp = get_stack_long(child, addr);
 		else if (addr >= (long) &dummy->fpu &&
 			 addr < (long) &dummy->u_fpvalid) {
 			if (!tsk_used_math(child)) {
 				if (addr == (long)&dummy->fpu.fpscr)
 					tmp = FPSCR_INIT;
 				else
 					tmp = 0;
 			} else
 				tmp = ((long *)child->thread.xstate)
 					[(addr - (long)&dummy->fpu) >> 2];
 		} else if (addr == (long) &dummy->u_fpvalid)
 			tmp = !!tsk_used_math(child);
 		else if (addr == PT_TEXT_ADDR)
 			tmp = child->mm->start_code;
 		else if (addr == PT_DATA_ADDR)
 			tmp = child->mm->start_data;
 		else if (addr == PT_TEXT_END_ADDR)
 			tmp = child->mm->end_code;
 		else if (addr == PT_TEXT_LEN)
 			tmp = child->mm->end_code - child->mm->start_code;
 		else
 			tmp = 0;
 		ret = put_user(tmp, datap);
 		break;
 	}

 	case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
 		ret = -EIO;
 		if ((addr & 3) || addr < 0 ||
 		    addr > sizeof(struct user) - 3)
 			break;

 		if (addr < sizeof(struct pt_regs))
 			ret = put_stack_long(child, addr, data);
 		else if (addr >= (long) &dummy->fpu &&
 			 addr < (long) &dummy->u_fpvalid) {
 			set_stopped_child_used_math(child);
 			((long *)child->thread.xstate)
 				[(addr - (long)&dummy->fpu) >> 2] = data;
 			ret = 0;
 		} else if (addr == (long) &dummy->u_fpvalid) {
 			conditional_stopped_child_used_math(data, child);
 			ret = 0;
 		}
 		break;

 	case PTRACE_GETREGS:
 		return copy_regset_to_user(child, &user_sh_native_view,
 					   REGSET_GENERAL,
 					   0, sizeof(struct pt_regs),
 					   (void __user *)data);
 	case PTRACE_SETREGS:
 		return copy_regset_from_user(child, &user_sh_native_view,
 					     REGSET_GENERAL,
 					     0, sizeof(struct pt_regs),
 					     (const void __user *)data);
 #ifdef CONFIG_SH_FPU
 	case PTRACE_GETFPREGS:
 		return copy_regset_to_user(child, &user_sh_native_view,
 					   REGSET_FPU,
 					   0, sizeof(struct user_fpu_struct),
 					   (void __user *)data);
 	case PTRACE_SETFPREGS:
 		return copy_regset_from_user(child, &user_sh_native_view,
 					     REGSET_FPU,
 					     0, sizeof(struct user_fpu_struct),
 					     (const void __user *)data);
 #endif
 #ifdef CONFIG_SH_DSP
 	case PTRACE_GETDSPREGS:
 		return copy_regset_to_user(child, &user_sh_native_view,
 					   REGSET_DSP,
 					   0, sizeof(struct pt_dspregs),
 					   (void __user *)data);
 	case PTRACE_SETDSPREGS:
 		return copy_regset_from_user(child, &user_sh_native_view,
 					     REGSET_DSP,
 					     0, sizeof(struct pt_dspregs),
 					     (const void __user *)data);
 #endif
 #ifdef CONFIG_BINFMT_ELF_FDPIC
 	case PTRACE_GETFDPIC: {
 		unsigned long tmp = 0;

 		switch (addr) {
 		case PTRACE_GETFDPIC_EXEC:
 			tmp = child->mm->context.exec_fdpic_loadmap;
 			break;
 		case PTRACE_GETFDPIC_INTERP:
 			tmp = child->mm->context.interp_fdpic_loadmap;
 			break;
 		default:
 			break;
 		}

 		ret = 0;
 		if (put_user(tmp, datap)) {
 			ret = -EFAULT;
 			break;
 		}
 		break;
 	}
 #endif
 	default:
 		ret = ptrace_request(child, request, addr, data);
 		break;
 	}

 	return ret;
 }

 static inline int audit_arch(void)
 {
 	int arch = EM_SH;

 #ifdef CONFIG_CPU_LITTLE_ENDIAN
 	arch |= __AUDIT_ARCH_LE;
 #endif

 	return arch;
 }

 asmlinkage long do_syscall_trace_enter(struct pt_regs *regs)
 {
 	long ret = 0;

 	secure_computing(regs->regs[0]);

 	if (test_thread_flag(TIF_SYSCALL_TRACE) &&
 	    tracehook_report_syscall_entry(regs))
 		/*
 		 * Tracing decided this syscall should not happen.
 		 * We'll return a bogus call number to get an ENOSYS
 		 * error, but leave the original number in regs->regs[0].
 		 */
 		ret = -1L;

 	if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
 		trace_sys_enter(regs, regs->regs[0]);

 	if (unlikely(current->audit_context))
 		audit_syscall_entry(audit_arch(), regs->regs[3],
 				    regs->regs[4], regs->regs[5],
 				    regs->regs[6], regs->regs[7]);

 	return ret ?: regs->regs[0];
 }

 asmlinkage void do_syscall_trace_leave(struct pt_regs *regs)
 {
 	int step;

 	if (unlikely(current->audit_context))
 		audit_syscall_exit(AUDITSC_RESULT(regs->regs[0]),
 				   regs->regs[0]);

 	if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
 		trace_sys_exit(regs, regs->regs[0]);

 	step = test_thread_flag(TIF_SINGLESTEP);
 	if (step || test_thread_flag(TIF_SYSCALL_TRACE))
 		tracehook_report_syscall_exit(regs, step);
 }
	/*
	* SuperH process tracing
	*
	* Copyright (C) 1999, 2000 Kaz Kojima & Niibe Yutaka
	* Copyright (C) 2002 - 2009 Paul Mundt
	*
	* Audit support by Yuichi Nakamura <ynakam@hitachisoft.jp>
	*
	* This file is subject to the terms and conditions of the GNU General Public
	* License. See the file "COPYING" in the main directory of this archive
	* for more details.
	*/
	#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/security.h>
	#include <linux/signal.h>
	#include <linux/io.h>
	#include <linux/audit.h>
	#include <linux/seccomp.h>
	#include <linux/tracehook.h>
	#include <linux/elf.h>
	#include <linux/regset.h>
	#include <linux/hw_breakpoint.h>
	#include <asm/uaccess.h>
	#include <asm/pgtable.h>
	#include <asm/system.h>
	#include <asm/processor.h>
	#include <asm/mmu_context.h>
	#include <asm/syscalls.h>
	#include <asm/fpu.h>

	#define CREATE_TRACE_POINTS
	#include <trace/events/syscalls.h>

	/*
	* This routine will get a word off of the process kernel stack.
	*/
	static inline int get_stack_long(struct task_struct *task, int offset)
	{
	unsigned char *stack;

	stack = (unsigned char *)task_pt_regs(task);
	stack += offset;
	return (((int )stack));
	}

	/*
	* This routine will put a word on the process kernel stack.
	*/
	static inline int put_stack_long(struct task_struct *task, int offset,
	unsigned long data)
	{
	unsigned char *stack;

	stack = (unsigned char *)task_pt_regs(task);
	stack += offset;
	(unsigned long ) stack = data;
	return 0;
	}

	void ptrace_triggered(struct perf_event *bp, int nmi,
	struct perf_sample_data data, struct pt_regs regs)
	{
	struct perf_event_attr attr;

	/*
	* Disable the breakpoint request here since ptrace has defined a
	* one-shot behaviour for breakpoint exceptions.
	*/
	attr = bp->attr;
	attr.disabled = true;
	modify_user_hw_breakpoint(bp, &attr);
	}

	static int set_single_step(struct task_struct *tsk, unsigned long addr)
	{
	struct thread_struct *thread = &tsk->thread;
	struct perf_event *bp;
	struct perf_event_attr attr;

	bp = thread->ptrace_bps[0];
	if (!bp) {
	ptrace_breakpoint_init(&attr);

	attr.bp_addr = addr;
	attr.bp_len = HW_BREAKPOINT_LEN_2;
	attr.bp_type = HW_BREAKPOINT_R;

	bp = register_user_hw_breakpoint(&attr, ptrace_triggered, tsk);
	if (IS_ERR(bp))
	return PTR_ERR(bp);

	thread->ptrace_bps[0] = bp;
	} else {
	int err;

	attr = bp->attr;
	attr.bp_addr = addr;
	err = modify_user_hw_breakpoint(bp, &attr);
	if (unlikely(err))
	return err;
	}

	return 0;
	}

	void user_enable_single_step(struct task_struct *child)
	{
	unsigned long pc = get_stack_long(child, offsetof(struct pt_regs, pc));

	set_tsk_thread_flag(child, TIF_SINGLESTEP);

	set_single_step(child, pc);
	}

	void user_disable_single_step(struct task_struct *child)
	{
	clear_tsk_thread_flag(child, TIF_SINGLESTEP);
	}

	/*
	* Called by kernel/ptrace.c when detaching..
	*
	* Make sure single step bits etc are not set.
	*/
	void ptrace_disable(struct task_struct *child)
	{
	user_disable_single_step(child);
	}

	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;

	ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
	regs->regs,
	0, 16 * sizeof(unsigned long));
	if (!ret)
	/* PC, PR, SR, GBR, MACH, MACL, TRA */
	ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
	&regs->pc,
	offsetof(struct pt_regs, pc),
	sizeof(struct pt_regs));
	if (!ret)
	ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
	sizeof(struct pt_regs), -1);

	return ret;
	}

	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);
	int ret;

	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
	regs->regs,
	0, 16 * sizeof(unsigned long));
	if (!ret && count > 0)
	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
	&regs->pc,
	offsetof(struct pt_regs, pc),
	sizeof(struct pt_regs));
	if (!ret)
	ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
	sizeof(struct pt_regs), -1);

	return ret;
	}

	#ifdef CONFIG_SH_FPU
	int fpregs_get(struct task_struct *target,
	const struct user_regset *regset,
	unsigned int pos, unsigned int count,
	void kbuf, void __user ubuf)
	{
	int ret;

	ret = init_fpu(target);
	if (ret)
	return ret;

	if ((boot_cpu_data.flags & CPU_HAS_FPU))
	return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
	&target->thread.xstate->hardfpu, 0, -1);

	return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
	&target->thread.xstate->softfpu, 0, -1);
	}

	static int fpregs_set(struct task_struct *target,
	const struct user_regset *regset,
	unsigned int pos, unsigned int count,
	const void kbuf, const void __user ubuf)
	{
	int ret;

	ret = init_fpu(target);
	if (ret)
	return ret;

	set_stopped_child_used_math(target);

	if ((boot_cpu_data.flags & CPU_HAS_FPU))
	return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
	&target->thread.xstate->hardfpu, 0, -1);

	return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
	&target->thread.xstate->softfpu, 0, -1);
	}

	static int fpregs_active(struct task_struct *target,
	const struct user_regset *regset)
	{
	return tsk_used_math(target) ? regset->n : 0;
	}
	#endif

	#ifdef CONFIG_SH_DSP
	static int dspregs_get(struct task_struct *target,
	const struct user_regset *regset,
	unsigned int pos, unsigned int count,
	void kbuf, void __user ubuf)
	{
	const struct pt_dspregs *regs =
	(struct pt_dspregs *)&target->thread.dsp_status.dsp_regs;
	int ret;

	ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, regs,
	0, sizeof(struct pt_dspregs));
	if (!ret)
	ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
	sizeof(struct pt_dspregs), -1);

	return ret;
	}

	static int dspregs_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_dspregs *regs =
	(struct pt_dspregs *)&target->thread.dsp_status.dsp_regs;
	int ret;

	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, regs,
	0, sizeof(struct pt_dspregs));
	if (!ret)
	ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
	sizeof(struct pt_dspregs), -1);

	return ret;
	}

	static int dspregs_active(struct task_struct *target,
	const struct user_regset *regset)
	{
	struct pt_regs *regs = task_pt_regs(target);

	return regs->sr & SR_DSP ? regset->n : 0;
	}
	#endif

	/*
	* These are our native regset flavours.
	*/
	enum sh_regset {
	REGSET_GENERAL,
	#ifdef CONFIG_SH_FPU
	REGSET_FPU,
	#endif
	#ifdef CONFIG_SH_DSP
	REGSET_DSP,
	#endif
	};

	static const struct user_regset sh_regsets[] = {
	/*
	* Format is:
	* R0 --> R15
	* PC, PR, SR, GBR, MACH, MACL, TRA
	*/
	[REGSET_GENERAL] = {
	.core_note_type = NT_PRSTATUS,
	.n = ELF_NGREG,
	.size = sizeof(long),
	.align = sizeof(long),
	.get = genregs_get,
	.set = genregs_set,
	},

	#ifdef CONFIG_SH_FPU
	[REGSET_FPU] = {
	.core_note_type = NT_PRFPREG,
	.n = sizeof(struct user_fpu_struct) / sizeof(long),
	.size = sizeof(long),
	.align = sizeof(long),
	.get = fpregs_get,
	.set = fpregs_set,
	.active = fpregs_active,
	},
	#endif

	#ifdef CONFIG_SH_DSP
	[REGSET_DSP] = {
	.n = sizeof(struct pt_dspregs) / sizeof(long),
	.size = sizeof(long),
	.align = sizeof(long),
	.get = dspregs_get,
	.set = dspregs_set,
	.active = dspregs_active,
	},
	#endif
	};

	static const struct user_regset_view user_sh_native_view = {
	.name = "sh",
	.e_machine = EM_SH,
	.regsets = sh_regsets,
	.n = ARRAY_SIZE(sh_regsets),
	};

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

	long arch_ptrace(struct task_struct *child, long request, long addr, long data)
	{
	struct user * dummy = NULL;
	unsigned long __user datap = (unsigned long __user )data;
	int ret;

	switch (request) {
	/* read the word at location addr in the USER area. */
	case PTRACE_PEEKUSR: {
	unsigned long tmp;

	ret = -EIO;
	if ((addr & 3) \|\| addr < 0 \|\|
	addr > sizeof(struct user) - 3)
	break;

	if (addr < sizeof(struct pt_regs))
	tmp = get_stack_long(child, addr);
	else if (addr >= (long) &dummy->fpu &&
	addr < (long) &dummy->u_fpvalid) {
	if (!tsk_used_math(child)) {
	if (addr == (long)&dummy->fpu.fpscr)
	tmp = FPSCR_INIT;
	else
	tmp = 0;
	} else
	tmp = ((long *)child->thread.xstate)
	[(addr - (long)&dummy->fpu) >> 2];
	} else if (addr == (long) &dummy->u_fpvalid)
	tmp = !!tsk_used_math(child);
	else if (addr == PT_TEXT_ADDR)
	tmp = child->mm->start_code;
	else if (addr == PT_DATA_ADDR)
	tmp = child->mm->start_data;
	else if (addr == PT_TEXT_END_ADDR)
	tmp = child->mm->end_code;
	else if (addr == PT_TEXT_LEN)
	tmp = child->mm->end_code - child->mm->start_code;
	else
	tmp = 0;
	ret = put_user(tmp, datap);
	break;
	}

	case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
	ret = -EIO;
	if ((addr & 3) \|\| addr < 0 \|\|
	addr > sizeof(struct user) - 3)
	break;

	if (addr < sizeof(struct pt_regs))
	ret = put_stack_long(child, addr, data);
	else if (addr >= (long) &dummy->fpu &&
	addr < (long) &dummy->u_fpvalid) {
	set_stopped_child_used_math(child);
	((long *)child->thread.xstate)
	[(addr - (long)&dummy->fpu) >> 2] = data;
	ret = 0;
	} else if (addr == (long) &dummy->u_fpvalid) {
	conditional_stopped_child_used_math(data, child);
	ret = 0;
	}
	break;

	case PTRACE_GETREGS:
	return copy_regset_to_user(child, &user_sh_native_view,
	REGSET_GENERAL,
	0, sizeof(struct pt_regs),
	(void __user *)data);
	case PTRACE_SETREGS:
	return copy_regset_from_user(child, &user_sh_native_view,
	REGSET_GENERAL,
	0, sizeof(struct pt_regs),
	(const void __user *)data);
	#ifdef CONFIG_SH_FPU
	case PTRACE_GETFPREGS:
	return copy_regset_to_user(child, &user_sh_native_view,
	REGSET_FPU,
	0, sizeof(struct user_fpu_struct),
	(void __user *)data);
	case PTRACE_SETFPREGS:
	return copy_regset_from_user(child, &user_sh_native_view,
	REGSET_FPU,
	0, sizeof(struct user_fpu_struct),
	(const void __user *)data);
	#endif
	#ifdef CONFIG_SH_DSP
	case PTRACE_GETDSPREGS:
	return copy_regset_to_user(child, &user_sh_native_view,
	REGSET_DSP,
	0, sizeof(struct pt_dspregs),
	(void __user *)data);
	case PTRACE_SETDSPREGS:
	return copy_regset_from_user(child, &user_sh_native_view,
	REGSET_DSP,
	0, sizeof(struct pt_dspregs),
	(const void __user *)data);
	#endif
	#ifdef CONFIG_BINFMT_ELF_FDPIC
	case PTRACE_GETFDPIC: {
	unsigned long tmp = 0;

	switch (addr) {
	case PTRACE_GETFDPIC_EXEC:
	tmp = child->mm->context.exec_fdpic_loadmap;
	break;
	case PTRACE_GETFDPIC_INTERP:
	tmp = child->mm->context.interp_fdpic_loadmap;
	break;
	default:
	break;
	}

	ret = 0;
	if (put_user(tmp, datap)) {
	ret = -EFAULT;
	break;
	}
	break;
	}
	#endif
	default:
	ret = ptrace_request(child, request, addr, data);
	break;
	}

	return ret;
	}

	static inline int audit_arch(void)
	{
	int arch = EM_SH;

	#ifdef CONFIG_CPU_LITTLE_ENDIAN
	arch \|= __AUDIT_ARCH_LE;
	#endif

	return arch;
	}

	asmlinkage long do_syscall_trace_enter(struct pt_regs *regs)
	{
	long ret = 0;

	secure_computing(regs->regs[0]);

	if (test_thread_flag(TIF_SYSCALL_TRACE) &&
	tracehook_report_syscall_entry(regs))
	/*
	* Tracing decided this syscall should not happen.
	* We'll return a bogus call number to get an ENOSYS
	* error, but leave the original number in regs->regs[0].
	*/
	ret = -1L;

	if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
	trace_sys_enter(regs, regs->regs[0]);

	if (unlikely(current->audit_context))
	audit_syscall_entry(audit_arch(), regs->regs[3],
	regs->regs[4], regs->regs[5],
	regs->regs[6], regs->regs[7]);

	return ret ?: regs->regs[0];
	}

	asmlinkage void do_syscall_trace_leave(struct pt_regs *regs)
	{
	int step;

	if (unlikely(current->audit_context))
	audit_syscall_exit(AUDITSC_RESULT(regs->regs[0]),
	regs->regs[0]);

	if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
	trace_sys_exit(regs, regs->regs[0]);

	step = test_thread_flag(TIF_SINGLESTEP);
	if (step \|\| test_thread_flag(TIF_SYSCALL_TRACE))
	tracehook_report_syscall_exit(regs, step);
	}