arch/sh/kernel/ptrace_64.c - linux - Git at Google

 /*
  * arch/sh/kernel/ptrace_64.c
  *
  * Copyright (C) 2000, 2001  Paolo Alberelli
  * Copyright (C) 2003 - 2008  Paul Mundt
  *
  * Started from SH3/4 version:
  *   SuperH version:   Copyright (C) 1999, 2000  Kaz Kojima & Niibe Yutaka
  *
  *   Original x86 implementation:
  *	By Ross Biro 1/23/92
  *	edited by Linus Torvalds
  *
  * 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/rwsem.h>
 #include <linux/sched.h>
 #include <linux/mm.h>
 #include <linux/smp.h>
 #include <linux/bitops.h>
 #include <linux/errno.h>
 #include <linux/ptrace.h>
 #include <linux/user.h>
 #include <linux/signal.h>
 #include <linux/syscalls.h>
 #include <linux/audit.h>
 #include <linux/seccomp.h>
 #include <linux/tracehook.h>
 #include <linux/elf.h>
 #include <linux/regset.h>
 #include <asm/io.h>
 #include <asm/uaccess.h>
 #include <asm/pgtable.h>
 #include <asm/processor.h>
 #include <asm/mmu_context.h>
 #include <asm/syscalls.h>
 #include <asm/fpu.h>
 #include <asm/traps.h>

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

 /* This mask defines the bits of the SR which the user is not allowed to
    change, which are everything except S, Q, M, PR, SZ, FR. */
 #define SR_MASK      (0xffff8cfd)

 /*
  * does not yet catch signals sent when the child dies.
  * in exit.c or in signal.c.
  */

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

 	stack = (unsigned char *)(task->thread.uregs);
 	stack += offset;
 	return (*((int *)stack));
 }

 static inline unsigned long
 get_fpu_long(struct task_struct *task, unsigned long addr)
 {
 	unsigned long tmp;
 	struct pt_regs *regs;
 	regs = (struct pt_regs*)((unsigned char *)task + THREAD_SIZE) - 1;

 	if (!tsk_used_math(task)) {
 		if (addr == offsetof(struct user_fpu_struct, fpscr)) {
 			tmp = FPSCR_INIT;
 		} else {
 			tmp = 0xffffffffUL; /* matches initial value in fpu.c */
 		}
 		return tmp;
 	}

 	if (last_task_used_math == task) {
 		enable_fpu();
 		save_fpu(task);
 		disable_fpu();
 		last_task_used_math = 0;
 		regs->sr |= SR_FD;
 	}

 	tmp = ((long *)task->thread.xstate)[addr / sizeof(unsigned long)];
 	return tmp;
 }

 /*
  * This routine will put a word into the user area in 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->thread.uregs);
 	stack += offset;
 	*(unsigned long *) stack = data;
 	return 0;
 }

 static inline int
 put_fpu_long(struct task_struct *task, unsigned long addr, unsigned long data)
 {
 	struct pt_regs *regs;

 	regs = (struct pt_regs*)((unsigned char *)task + THREAD_SIZE) - 1;

 	if (!tsk_used_math(task)) {
 		init_fpu(task);
 	} else if (last_task_used_math == task) {
 		enable_fpu();
 		save_fpu(task);
 		disable_fpu();
 		last_task_used_math = 0;
 		regs->sr |= SR_FD;
 	}

 	((long *)task->thread.xstate)[addr / sizeof(unsigned long)] = data;
 	return 0;
 }

 void user_enable_single_step(struct task_struct *child)
 {
 	struct pt_regs *regs = child->thread.uregs;

 	regs->sr |= SR_SSTEP;	/* auto-resetting upon exception */

 	set_tsk_thread_flag(child, TIF_SINGLESTEP);
 }

 void user_disable_single_step(struct task_struct *child)
 {
 	struct pt_regs *regs = child->thread.uregs;

 	regs->sr &= ~SR_SSTEP;

 	clear_tsk_thread_flag(child, TIF_SINGLESTEP);
 }

 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;

 	/* PC, SR, SYSCALL */
 	ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 				  &regs->pc,
 				  0, 3 * sizeof(unsigned long long));

 	/* R1 -> R63 */
 	if (!ret)
 		ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 					  regs->regs,
 					  offsetof(struct pt_regs, regs[0]),
 					  63 * sizeof(unsigned long long));
 	/* TR0 -> TR7 */
 	if (!ret)
 		ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 					  regs->tregs,
 					  offsetof(struct pt_regs, tregs[0]),
 					  8 * sizeof(unsigned long long));

 	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;

 	/* PC, SR, SYSCALL */
 	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 				 &regs->pc,
 				 0, 3 * sizeof(unsigned long long));

 	/* R1 -> R63 */
 	if (!ret && count > 0)
 		ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 					 regs->regs,
 					 offsetof(struct pt_regs, regs[0]),
 					 63 * sizeof(unsigned long long));

 	/* TR0 -> TR7 */
 	if (!ret && count > 0)
 		ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
 					 regs->tregs,
 					 offsetof(struct pt_regs, tregs[0]),
 					 8 * sizeof(unsigned long long));

 	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;

 	return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
 				   &target->thread.xstate->hardfpu, 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);

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

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

 const struct pt_regs_offset regoffset_table[] = {
 	REG_OFFSET_NAME(pc),
 	REG_OFFSET_NAME(sr),
 	REG_OFFSET_NAME(syscall_nr),
 	REGS_OFFSET_NAME(0),
 	REGS_OFFSET_NAME(1),
 	REGS_OFFSET_NAME(2),
 	REGS_OFFSET_NAME(3),
 	REGS_OFFSET_NAME(4),
 	REGS_OFFSET_NAME(5),
 	REGS_OFFSET_NAME(6),
 	REGS_OFFSET_NAME(7),
 	REGS_OFFSET_NAME(8),
 	REGS_OFFSET_NAME(9),
 	REGS_OFFSET_NAME(10),
 	REGS_OFFSET_NAME(11),
 	REGS_OFFSET_NAME(12),
 	REGS_OFFSET_NAME(13),
 	REGS_OFFSET_NAME(14),
 	REGS_OFFSET_NAME(15),
 	REGS_OFFSET_NAME(16),
 	REGS_OFFSET_NAME(17),
 	REGS_OFFSET_NAME(18),
 	REGS_OFFSET_NAME(19),
 	REGS_OFFSET_NAME(20),
 	REGS_OFFSET_NAME(21),
 	REGS_OFFSET_NAME(22),
 	REGS_OFFSET_NAME(23),
 	REGS_OFFSET_NAME(24),
 	REGS_OFFSET_NAME(25),
 	REGS_OFFSET_NAME(26),
 	REGS_OFFSET_NAME(27),
 	REGS_OFFSET_NAME(28),
 	REGS_OFFSET_NAME(29),
 	REGS_OFFSET_NAME(30),
 	REGS_OFFSET_NAME(31),
 	REGS_OFFSET_NAME(32),
 	REGS_OFFSET_NAME(33),
 	REGS_OFFSET_NAME(34),
 	REGS_OFFSET_NAME(35),
 	REGS_OFFSET_NAME(36),
 	REGS_OFFSET_NAME(37),
 	REGS_OFFSET_NAME(38),
 	REGS_OFFSET_NAME(39),
 	REGS_OFFSET_NAME(40),
 	REGS_OFFSET_NAME(41),
 	REGS_OFFSET_NAME(42),
 	REGS_OFFSET_NAME(43),
 	REGS_OFFSET_NAME(44),
 	REGS_OFFSET_NAME(45),
 	REGS_OFFSET_NAME(46),
 	REGS_OFFSET_NAME(47),
 	REGS_OFFSET_NAME(48),
 	REGS_OFFSET_NAME(49),
 	REGS_OFFSET_NAME(50),
 	REGS_OFFSET_NAME(51),
 	REGS_OFFSET_NAME(52),
 	REGS_OFFSET_NAME(53),
 	REGS_OFFSET_NAME(54),
 	REGS_OFFSET_NAME(55),
 	REGS_OFFSET_NAME(56),
 	REGS_OFFSET_NAME(57),
 	REGS_OFFSET_NAME(58),
 	REGS_OFFSET_NAME(59),
 	REGS_OFFSET_NAME(60),
 	REGS_OFFSET_NAME(61),
 	REGS_OFFSET_NAME(62),
 	REGS_OFFSET_NAME(63),
 	TREGS_OFFSET_NAME(0),
 	TREGS_OFFSET_NAME(1),
 	TREGS_OFFSET_NAME(2),
 	TREGS_OFFSET_NAME(3),
 	TREGS_OFFSET_NAME(4),
 	TREGS_OFFSET_NAME(5),
 	TREGS_OFFSET_NAME(6),
 	TREGS_OFFSET_NAME(7),
 	REG_OFFSET_END,
 };

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

 static const struct user_regset sh_regsets[] = {
 	/*
 	 * Format is:
 	 *	PC, SR, SYSCALL,
 	 *	R1 --> R63,
 	 *	TR0 --> TR7,
 	 */
 	[REGSET_GENERAL] = {
 		.core_note_type	= NT_PRSTATUS,
 		.n		= ELF_NGREG,
 		.size		= sizeof(long long),
 		.align		= sizeof(long 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 long),
 		.size		= sizeof(long long),
 		.align		= sizeof(long long),
 		.get		= fpregs_get,
 		.set		= fpregs_set,
 		.active		= fpregs_active,
 	},
 #endif
 };

 static const struct user_regset_view user_sh64_native_view = {
 	.name		= "sh64",
 	.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_sh64_native_view;
 }

 long arch_ptrace(struct task_struct *child, long request,
 		 unsigned long addr, unsigned long data)
 {
 	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: {
 		unsigned long tmp;

 		ret = -EIO;
 		if ((addr & 3) || addr < 0)
 			break;

 		if (addr < sizeof(struct pt_regs))
 			tmp = get_stack_long(child, addr);
 		else if ((addr >= offsetof(struct user, fpu)) &&
 			 (addr <  offsetof(struct user, u_fpvalid))) {
 			unsigned long index;
 			ret = init_fpu(child);
 			if (ret)
 				break;
 			index = addr - offsetof(struct user, fpu);
 			tmp = get_fpu_long(child, index);
 		} else if (addr == offsetof(struct user, u_fpvalid)) {
 			tmp = !!tsk_used_math(child);
 		} else {
 			break;
 		}
 		ret = put_user(tmp, datap);
 		break;
 	}

 	case PTRACE_POKEUSR:
                 /* write the word at location addr in the USER area. We must
                    disallow any changes to certain SR bits or u_fpvalid, since
                    this could crash the kernel or result in a security
                    loophole. */
 		ret = -EIO;
 		if ((addr & 3) || addr < 0)
 			break;

 		if (addr < sizeof(struct pt_regs)) {
 			/* Ignore change of top 32 bits of SR */
 			if (addr == offsetof (struct pt_regs, sr)+4)
 			{
 				ret = 0;
 				break;
 			}
 			/* If lower 32 bits of SR, ignore non-user bits */
 			if (addr == offsetof (struct pt_regs, sr))
 			{
 				long cursr = get_stack_long(child, addr);
 				data &= ~(SR_MASK);
 				data |= (cursr & SR_MASK);
 			}
 			ret = put_stack_long(child, addr, data);
 		}
 		else if ((addr >= offsetof(struct user, fpu)) &&
 			 (addr <  offsetof(struct user, u_fpvalid))) {
 			unsigned long index;
 			ret = init_fpu(child);
 			if (ret)
 				break;
 			index = addr - offsetof(struct user, fpu);
 			ret = put_fpu_long(child, index, data);
 		}
 		break;

 	case PTRACE_GETREGS:
 		return copy_regset_to_user(child, &user_sh64_native_view,
 					   REGSET_GENERAL,
 					   0, sizeof(struct pt_regs),
 					   datap);
 	case PTRACE_SETREGS:
 		return copy_regset_from_user(child, &user_sh64_native_view,
 					     REGSET_GENERAL,
 					     0, sizeof(struct pt_regs),
 					     datap);
 #ifdef CONFIG_SH_FPU
 	case PTRACE_GETFPREGS:
 		return copy_regset_to_user(child, &user_sh64_native_view,
 					   REGSET_FPU,
 					   0, sizeof(struct user_fpu_struct),
 					   datap);
 	case PTRACE_SETFPREGS:
 		return copy_regset_from_user(child, &user_sh64_native_view,
 					     REGSET_FPU,
 					     0, sizeof(struct user_fpu_struct),
 					     datap);
 #endif
 	default:
 		ret = ptrace_request(child, request, addr, data);
 		break;
 	}

 	return ret;
 }

 asmlinkage int sh64_ptrace(long request, long pid,
 			   unsigned long addr, unsigned long data)
 {
 #define WPC_DBRMODE 0x0d104008
 	static unsigned long first_call;

 	if (!test_and_set_bit(0, &first_call)) {
 		/* Set WPC.DBRMODE to 0.  This makes all debug events get
 		 * delivered through RESVEC, i.e. into the handlers in entry.S.
 		 * (If the kernel was downloaded using a remote gdb, WPC.DBRMODE
 		 * would normally be left set to 1, which makes debug events get
 		 * delivered through DBRVEC, i.e. into the remote gdb's
 		 * handlers.  This prevents ptrace getting them, and confuses
 		 * the remote gdb.) */
 		printk("DBRMODE set to 0 to permit native debugging\n");
 		poke_real_address_q(WPC_DBRMODE, 0);
 	}

 	return sys_ptrace(request, pid, addr, data);
 }

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

 	secure_computing_strict(regs->regs[9]);

 	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 = -1LL;

 	if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
 		trace_sys_enter(regs, regs->regs[9]);

 	audit_syscall_entry(regs->regs[1], regs->regs[2], regs->regs[3],
 			    regs->regs[4], regs->regs[5]);

 	return ret ?: regs->regs[9];
 }

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

 	audit_syscall_exit(regs);

 	if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
 		trace_sys_exit(regs, regs->regs[9]);

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

 /* Called with interrupts disabled */
 asmlinkage void do_single_step(unsigned long long vec, struct pt_regs *regs)
 {
 	/* This is called after a single step exception (DEBUGSS).
 	   There is no need to change the PC, as it is a post-execution
 	   exception, as entry.S does not do anything to the PC for DEBUGSS.
 	   We need to clear the Single Step setting in SR to avoid
 	   continually stepping. */
 	local_irq_enable();
 	regs->sr &= ~SR_SSTEP;
 	force_sig(SIGTRAP, current);
 }

 /* Called with interrupts disabled */
 BUILD_TRAP_HANDLER(breakpoint)
 {
 	TRAP_HANDLER_DECL;

 	/* We need to forward step the PC, to counteract the backstep done
 	   in signal.c. */
 	local_irq_enable();
 	force_sig(SIGTRAP, current);
 	regs->pc += 4;
 }

 /*
  * 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);
 }
	/*
	* arch/sh/kernel/ptrace_64.c
	*
	* Copyright (C) 2000, 2001 Paolo Alberelli
	* Copyright (C) 2003 - 2008 Paul Mundt
	*
	* Started from SH3/4 version:
	* SuperH version: Copyright (C) 1999, 2000 Kaz Kojima & Niibe Yutaka
	*
	* Original x86 implementation:
	* By Ross Biro 1/23/92
	* edited by Linus Torvalds
	*
	* 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/rwsem.h>
	#include <linux/sched.h>
	#include <linux/mm.h>
	#include <linux/smp.h>
	#include <linux/bitops.h>
	#include <linux/errno.h>
	#include <linux/ptrace.h>
	#include <linux/user.h>
	#include <linux/signal.h>
	#include <linux/syscalls.h>
	#include <linux/audit.h>
	#include <linux/seccomp.h>
	#include <linux/tracehook.h>
	#include <linux/elf.h>
	#include <linux/regset.h>
	#include <asm/io.h>
	#include <asm/uaccess.h>
	#include <asm/pgtable.h>
	#include <asm/processor.h>
	#include <asm/mmu_context.h>
	#include <asm/syscalls.h>
	#include <asm/fpu.h>
	#include <asm/traps.h>

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

	/* This mask defines the bits of the SR which the user is not allowed to
	change, which are everything except S, Q, M, PR, SZ, FR. */
	#define SR_MASK (0xffff8cfd)

	/*
	* does not yet catch signals sent when the child dies.
	* in exit.c or in signal.c.
	*/

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

	stack = (unsigned char *)(task->thread.uregs);
	stack += offset;
	return (((int )stack));
	}

	static inline unsigned long
	get_fpu_long(struct task_struct *task, unsigned long addr)
	{
	unsigned long tmp;
	struct pt_regs *regs;
	regs = (struct pt_regs)((unsigned char )task + THREAD_SIZE) - 1;

	if (!tsk_used_math(task)) {
	if (addr == offsetof(struct user_fpu_struct, fpscr)) {
	tmp = FPSCR_INIT;
	} else {
	tmp = 0xffffffffUL; /* matches initial value in fpu.c */
	}
	return tmp;
	}

	if (last_task_used_math == task) {
	enable_fpu();
	save_fpu(task);
	disable_fpu();
	last_task_used_math = 0;
	regs->sr \|= SR_FD;
	}

	tmp = ((long *)task->thread.xstate)[addr / sizeof(unsigned long)];
	return tmp;
	}

	/*
	* This routine will put a word into the user area in 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->thread.uregs);
	stack += offset;
	(unsigned long ) stack = data;
	return 0;
	}

	static inline int
	put_fpu_long(struct task_struct *task, unsigned long addr, unsigned long data)
	{
	struct pt_regs *regs;

	regs = (struct pt_regs)((unsigned char )task + THREAD_SIZE) - 1;

	if (!tsk_used_math(task)) {
	init_fpu(task);
	} else if (last_task_used_math == task) {
	enable_fpu();
	save_fpu(task);
	disable_fpu();
	last_task_used_math = 0;
	regs->sr \|= SR_FD;
	}

	((long *)task->thread.xstate)[addr / sizeof(unsigned long)] = data;
	return 0;
	}

	void user_enable_single_step(struct task_struct *child)
	{
	struct pt_regs *regs = child->thread.uregs;

	regs->sr \|= SR_SSTEP; /* auto-resetting upon exception */

	set_tsk_thread_flag(child, TIF_SINGLESTEP);
	}

	void user_disable_single_step(struct task_struct *child)
	{
	struct pt_regs *regs = child->thread.uregs;

	regs->sr &= ~SR_SSTEP;

	clear_tsk_thread_flag(child, TIF_SINGLESTEP);
	}

	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;

	/* PC, SR, SYSCALL */
	ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
	&regs->pc,
	0, 3 * sizeof(unsigned long long));

	/* R1 -> R63 */
	if (!ret)
	ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
	regs->regs,
	offsetof(struct pt_regs, regs[0]),
	63 * sizeof(unsigned long long));
	/* TR0 -> TR7 */
	if (!ret)
	ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
	regs->tregs,
	offsetof(struct pt_regs, tregs[0]),
	8 * sizeof(unsigned long long));

	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;

	/* PC, SR, SYSCALL */
	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
	&regs->pc,
	0, 3 * sizeof(unsigned long long));

	/* R1 -> R63 */
	if (!ret && count > 0)
	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
	regs->regs,
	offsetof(struct pt_regs, regs[0]),
	63 * sizeof(unsigned long long));

	/* TR0 -> TR7 */
	if (!ret && count > 0)
	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
	regs->tregs,
	offsetof(struct pt_regs, tregs[0]),
	8 * sizeof(unsigned long long));

	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;

	return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
	&target->thread.xstate->hardfpu, 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);

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

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

	const struct pt_regs_offset regoffset_table[] = {
	REG_OFFSET_NAME(pc),
	REG_OFFSET_NAME(sr),
	REG_OFFSET_NAME(syscall_nr),
	REGS_OFFSET_NAME(0),
	REGS_OFFSET_NAME(1),
	REGS_OFFSET_NAME(2),
	REGS_OFFSET_NAME(3),
	REGS_OFFSET_NAME(4),
	REGS_OFFSET_NAME(5),
	REGS_OFFSET_NAME(6),
	REGS_OFFSET_NAME(7),
	REGS_OFFSET_NAME(8),
	REGS_OFFSET_NAME(9),
	REGS_OFFSET_NAME(10),
	REGS_OFFSET_NAME(11),
	REGS_OFFSET_NAME(12),
	REGS_OFFSET_NAME(13),
	REGS_OFFSET_NAME(14),
	REGS_OFFSET_NAME(15),
	REGS_OFFSET_NAME(16),
	REGS_OFFSET_NAME(17),
	REGS_OFFSET_NAME(18),
	REGS_OFFSET_NAME(19),
	REGS_OFFSET_NAME(20),
	REGS_OFFSET_NAME(21),
	REGS_OFFSET_NAME(22),
	REGS_OFFSET_NAME(23),
	REGS_OFFSET_NAME(24),
	REGS_OFFSET_NAME(25),
	REGS_OFFSET_NAME(26),
	REGS_OFFSET_NAME(27),
	REGS_OFFSET_NAME(28),
	REGS_OFFSET_NAME(29),
	REGS_OFFSET_NAME(30),
	REGS_OFFSET_NAME(31),
	REGS_OFFSET_NAME(32),
	REGS_OFFSET_NAME(33),
	REGS_OFFSET_NAME(34),
	REGS_OFFSET_NAME(35),
	REGS_OFFSET_NAME(36),
	REGS_OFFSET_NAME(37),
	REGS_OFFSET_NAME(38),
	REGS_OFFSET_NAME(39),
	REGS_OFFSET_NAME(40),
	REGS_OFFSET_NAME(41),
	REGS_OFFSET_NAME(42),
	REGS_OFFSET_NAME(43),
	REGS_OFFSET_NAME(44),
	REGS_OFFSET_NAME(45),
	REGS_OFFSET_NAME(46),
	REGS_OFFSET_NAME(47),
	REGS_OFFSET_NAME(48),
	REGS_OFFSET_NAME(49),
	REGS_OFFSET_NAME(50),
	REGS_OFFSET_NAME(51),
	REGS_OFFSET_NAME(52),
	REGS_OFFSET_NAME(53),
	REGS_OFFSET_NAME(54),
	REGS_OFFSET_NAME(55),
	REGS_OFFSET_NAME(56),
	REGS_OFFSET_NAME(57),
	REGS_OFFSET_NAME(58),
	REGS_OFFSET_NAME(59),
	REGS_OFFSET_NAME(60),
	REGS_OFFSET_NAME(61),
	REGS_OFFSET_NAME(62),
	REGS_OFFSET_NAME(63),
	TREGS_OFFSET_NAME(0),
	TREGS_OFFSET_NAME(1),
	TREGS_OFFSET_NAME(2),
	TREGS_OFFSET_NAME(3),
	TREGS_OFFSET_NAME(4),
	TREGS_OFFSET_NAME(5),
	TREGS_OFFSET_NAME(6),
	TREGS_OFFSET_NAME(7),
	REG_OFFSET_END,
	};

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

	static const struct user_regset sh_regsets[] = {
	/*
	* Format is:
	* PC, SR, SYSCALL,
	* R1 --> R63,
	* TR0 --> TR7,
	*/
	[REGSET_GENERAL] = {
	.core_note_type = NT_PRSTATUS,
	.n = ELF_NGREG,
	.size = sizeof(long long),
	.align = sizeof(long 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 long),
	.size = sizeof(long long),
	.align = sizeof(long long),
	.get = fpregs_get,
	.set = fpregs_set,
	.active = fpregs_active,
	},
	#endif
	};

	static const struct user_regset_view user_sh64_native_view = {
	.name = "sh64",
	.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_sh64_native_view;
	}

	long arch_ptrace(struct task_struct *child, long request,
	unsigned long addr, unsigned long data)
	{
	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: {
	unsigned long tmp;

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

	if (addr < sizeof(struct pt_regs))
	tmp = get_stack_long(child, addr);
	else if ((addr >= offsetof(struct user, fpu)) &&
	(addr < offsetof(struct user, u_fpvalid))) {
	unsigned long index;
	ret = init_fpu(child);
	if (ret)
	break;
	index = addr - offsetof(struct user, fpu);
	tmp = get_fpu_long(child, index);
	} else if (addr == offsetof(struct user, u_fpvalid)) {
	tmp = !!tsk_used_math(child);
	} else {
	break;
	}
	ret = put_user(tmp, datap);
	break;
	}

	case PTRACE_POKEUSR:
	/* write the word at location addr in the USER area. We must
	disallow any changes to certain SR bits or u_fpvalid, since
	this could crash the kernel or result in a security
	loophole. */
	ret = -EIO;
	if ((addr & 3) \|\| addr < 0)
	break;

	if (addr < sizeof(struct pt_regs)) {
	/* Ignore change of top 32 bits of SR */
	if (addr == offsetof (struct pt_regs, sr)+4)
	{
	ret = 0;
	break;
	}
	/* If lower 32 bits of SR, ignore non-user bits */
	if (addr == offsetof (struct pt_regs, sr))
	{
	long cursr = get_stack_long(child, addr);
	data &= ~(SR_MASK);
	data \|= (cursr & SR_MASK);
	}
	ret = put_stack_long(child, addr, data);
	}
	else if ((addr >= offsetof(struct user, fpu)) &&
	(addr < offsetof(struct user, u_fpvalid))) {
	unsigned long index;
	ret = init_fpu(child);
	if (ret)
	break;
	index = addr - offsetof(struct user, fpu);
	ret = put_fpu_long(child, index, data);
	}
	break;

	case PTRACE_GETREGS:
	return copy_regset_to_user(child, &user_sh64_native_view,
	REGSET_GENERAL,
	0, sizeof(struct pt_regs),
	datap);
	case PTRACE_SETREGS:
	return copy_regset_from_user(child, &user_sh64_native_view,
	REGSET_GENERAL,
	0, sizeof(struct pt_regs),
	datap);
	#ifdef CONFIG_SH_FPU
	case PTRACE_GETFPREGS:
	return copy_regset_to_user(child, &user_sh64_native_view,
	REGSET_FPU,
	0, sizeof(struct user_fpu_struct),
	datap);
	case PTRACE_SETFPREGS:
	return copy_regset_from_user(child, &user_sh64_native_view,
	REGSET_FPU,
	0, sizeof(struct user_fpu_struct),
	datap);
	#endif
	default:
	ret = ptrace_request(child, request, addr, data);
	break;
	}

	return ret;
	}

	asmlinkage int sh64_ptrace(long request, long pid,
	unsigned long addr, unsigned long data)
	{
	#define WPC_DBRMODE 0x0d104008
	static unsigned long first_call;

	if (!test_and_set_bit(0, &first_call)) {
	/* Set WPC.DBRMODE to 0. This makes all debug events get
	* delivered through RESVEC, i.e. into the handlers in entry.S.
	* (If the kernel was downloaded using a remote gdb, WPC.DBRMODE
	* would normally be left set to 1, which makes debug events get
	* delivered through DBRVEC, i.e. into the remote gdb's
	* handlers. This prevents ptrace getting them, and confuses
	* the remote gdb.) */
	printk("DBRMODE set to 0 to permit native debugging\n");
	poke_real_address_q(WPC_DBRMODE, 0);
	}

	return sys_ptrace(request, pid, addr, data);
	}

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

	secure_computing_strict(regs->regs[9]);

	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 = -1LL;

	if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
	trace_sys_enter(regs, regs->regs[9]);

	audit_syscall_entry(regs->regs[1], regs->regs[2], regs->regs[3],
	regs->regs[4], regs->regs[5]);

	return ret ?: regs->regs[9];
	}

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

	audit_syscall_exit(regs);

	if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
	trace_sys_exit(regs, regs->regs[9]);

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

	/* Called with interrupts disabled */
	asmlinkage void do_single_step(unsigned long long vec, struct pt_regs *regs)
	{
	/* This is called after a single step exception (DEBUGSS).
	There is no need to change the PC, as it is a post-execution
	exception, as entry.S does not do anything to the PC for DEBUGSS.
	We need to clear the Single Step setting in SR to avoid
	continually stepping. */
	local_irq_enable();
	regs->sr &= ~SR_SSTEP;
	force_sig(SIGTRAP, current);
	}

	/* Called with interrupts disabled */
	BUILD_TRAP_HANDLER(breakpoint)
	{
	TRAP_HANDLER_DECL;

	/* We need to forward step the PC, to counteract the backstep done
	in signal.c. */
	local_irq_enable();
	force_sig(SIGTRAP, current);
	regs->pc += 4;
	}

	/*
	* 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);
	}