[mirror_ubuntu-bionic-kernel.git] / arch / sh / kernel / ptrace_32.c

/*
 * 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

const struct pt_regs_offset regoffset_table[] = {
	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),
	REG_OFFSET_NAME(pc),
	REG_OFFSET_NAME(pr),
	REG_OFFSET_NAME(sr),
	REG_OFFSET_NAME(gbr),
	REG_OFFSET_NAME(mach),
	REG_OFFSET_NAME(macl),
	REG_OFFSET_NAME(tra),
	REG_OFFSET_END,
};

/*
 * 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
	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);
}
Commit	Line	Data
	1	/*
	2	* SuperH process tracing
	3	*
	4	* Copyright (C) 1999, 2000 Kaz Kojima & Niibe Yutaka
	5	* Copyright (C) 2002 - 2009 Paul Mundt
	6	*
	7	* Audit support by Yuichi Nakamura <ynakam@hitachisoft.jp>
	8	*
	9	* This file is subject to the terms and conditions of the GNU General Public
	10	* License. See the file "COPYING" in the main directory of this archive
	11	* for more details.
	12	*/
	13	#include <linux/kernel.h>
	14	#include <linux/sched.h>
	15	#include <linux/mm.h>
	16	#include <linux/smp.h>
	17	#include <linux/errno.h>
	18	#include <linux/ptrace.h>
	19	#include <linux/user.h>
	20	#include <linux/security.h>
	21	#include <linux/signal.h>
	22	#include <linux/io.h>
	23	#include <linux/audit.h>
	24	#include <linux/seccomp.h>
	25	#include <linux/tracehook.h>
	26	#include <linux/elf.h>
	27	#include <linux/regset.h>
	28	#include <linux/hw_breakpoint.h>
	29	#include <asm/uaccess.h>
	30	#include <asm/pgtable.h>
	31	#include <asm/system.h>
	32	#include <asm/processor.h>
	33	#include <asm/mmu_context.h>
	34	#include <asm/syscalls.h>
	35	#include <asm/fpu.h>
	36
	37	#define CREATE_TRACE_POINTS
	38	#include <trace/events/syscalls.h>
	39
	40	/*
	41	* This routine will get a word off of the process kernel stack.
	42	*/
	43	static inline int get_stack_long(struct task_struct *task, int offset)
	44	{
	45	unsigned char *stack;
	46
	47	stack = (unsigned char *)task_pt_regs(task);
	48	stack += offset;
	49	return (((int )stack));
	50	}
	51
	52	/*
	53	* This routine will put a word on the process kernel stack.
	54	*/
	55	static inline int put_stack_long(struct task_struct *task, int offset,
	56	unsigned long data)
	57	{
	58	unsigned char *stack;
	59
	60	stack = (unsigned char *)task_pt_regs(task);
	61	stack += offset;
	62	(unsigned long ) stack = data;
	63	return 0;
	64	}
	65
	66	void ptrace_triggered(struct perf_event *bp, int nmi,
	67	struct perf_sample_data data, struct pt_regs regs)
	68	{
	69	struct perf_event_attr attr;
	70
	71	/*
	72	* Disable the breakpoint request here since ptrace has defined a
	73	* one-shot behaviour for breakpoint exceptions.
	74	*/
	75	attr = bp->attr;
	76	attr.disabled = true;
	77	modify_user_hw_breakpoint(bp, &attr);
	78	}
	79
	80	static int set_single_step(struct task_struct *tsk, unsigned long addr)
	81	{
	82	struct thread_struct *thread = &tsk->thread;
	83	struct perf_event *bp;
	84	struct perf_event_attr attr;
	85
	86	bp = thread->ptrace_bps[0];
	87	if (!bp) {
	88	ptrace_breakpoint_init(&attr);
	89
	90	attr.bp_addr = addr;
	91	attr.bp_len = HW_BREAKPOINT_LEN_2;
	92	attr.bp_type = HW_BREAKPOINT_R;
	93
	94	bp = register_user_hw_breakpoint(&attr, ptrace_triggered, tsk);
	95	if (IS_ERR(bp))
	96	return PTR_ERR(bp);
	97
	98	thread->ptrace_bps[0] = bp;
	99	} else {
	100	int err;
	101
	102	attr = bp->attr;
	103	attr.bp_addr = addr;
	104	err = modify_user_hw_breakpoint(bp, &attr);
	105	if (unlikely(err))
	106	return err;
	107	}
	108
	109	return 0;
	110	}
	111
	112	void user_enable_single_step(struct task_struct *child)
	113	{
	114	unsigned long pc = get_stack_long(child, offsetof(struct pt_regs, pc));
	115
	116	set_tsk_thread_flag(child, TIF_SINGLESTEP);
	117
	118	set_single_step(child, pc);
	119	}
	120
	121	void user_disable_single_step(struct task_struct *child)
	122	{
	123	clear_tsk_thread_flag(child, TIF_SINGLESTEP);
	124	}
	125
	126	/*
	127	* Called by kernel/ptrace.c when detaching..
	128	*
	129	* Make sure single step bits etc are not set.
	130	*/
	131	void ptrace_disable(struct task_struct *child)
	132	{
	133	user_disable_single_step(child);
	134	}
	135
	136	static int genregs_get(struct task_struct *target,
	137	const struct user_regset *regset,
	138	unsigned int pos, unsigned int count,
	139	void kbuf, void __user ubuf)
	140	{
	141	const struct pt_regs *regs = task_pt_regs(target);
	142	int ret;
	143
	144	ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
	145	regs->regs,
	146	0, 16 * sizeof(unsigned long));
	147	if (!ret)
	148	/* PC, PR, SR, GBR, MACH, MACL, TRA */
	149	ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
	150	&regs->pc,
	151	offsetof(struct pt_regs, pc),
	152	sizeof(struct pt_regs));
	153	if (!ret)
	154	ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
	155	sizeof(struct pt_regs), -1);
	156
	157	return ret;
	158	}
	159
	160	static int genregs_set(struct task_struct *target,
	161	const struct user_regset *regset,
	162	unsigned int pos, unsigned int count,
	163	const void kbuf, const void __user ubuf)
	164	{
	165	struct pt_regs *regs = task_pt_regs(target);
	166	int ret;
	167
	168	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
	169	regs->regs,
	170	0, 16 * sizeof(unsigned long));
	171	if (!ret && count > 0)
	172	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
	173	&regs->pc,
	174	offsetof(struct pt_regs, pc),
	175	sizeof(struct pt_regs));
	176	if (!ret)
	177	ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
	178	sizeof(struct pt_regs), -1);
	179
	180	return ret;
	181	}
	182
	183	#ifdef CONFIG_SH_FPU
	184	int fpregs_get(struct task_struct *target,
	185	const struct user_regset *regset,
	186	unsigned int pos, unsigned int count,
	187	void kbuf, void __user ubuf)
	188	{
	189	int ret;
	190
	191	ret = init_fpu(target);
	192	if (ret)
	193	return ret;
	194
	195	if ((boot_cpu_data.flags & CPU_HAS_FPU))
	196	return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
	197	&target->thread.xstate->hardfpu, 0, -1);
	198
	199	return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
	200	&target->thread.xstate->softfpu, 0, -1);
	201	}
	202
	203	static int fpregs_set(struct task_struct *target,
	204	const struct user_regset *regset,
	205	unsigned int pos, unsigned int count,
	206	const void kbuf, const void __user ubuf)
	207	{
	208	int ret;
	209
	210	ret = init_fpu(target);
	211	if (ret)
	212	return ret;
	213
	214	set_stopped_child_used_math(target);
	215
	216	if ((boot_cpu_data.flags & CPU_HAS_FPU))
	217	return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
	218	&target->thread.xstate->hardfpu, 0, -1);
	219
	220	return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
	221	&target->thread.xstate->softfpu, 0, -1);
	222	}
	223
	224	static int fpregs_active(struct task_struct *target,
	225	const struct user_regset *regset)
	226	{
	227	return tsk_used_math(target) ? regset->n : 0;
	228	}
	229	#endif
	230
	231	#ifdef CONFIG_SH_DSP
	232	static int dspregs_get(struct task_struct *target,
	233	const struct user_regset *regset,
	234	unsigned int pos, unsigned int count,
	235	void kbuf, void __user ubuf)
	236	{
	237	const struct pt_dspregs *regs =
	238	(struct pt_dspregs *)&target->thread.dsp_status.dsp_regs;
	239	int ret;
	240
	241	ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, regs,
	242	0, sizeof(struct pt_dspregs));
	243	if (!ret)
	244	ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
	245	sizeof(struct pt_dspregs), -1);
	246
	247	return ret;
	248	}
	249
	250	static int dspregs_set(struct task_struct *target,
	251	const struct user_regset *regset,
	252	unsigned int pos, unsigned int count,
	253	const void kbuf, const void __user ubuf)
	254	{
	255	struct pt_dspregs *regs =
	256	(struct pt_dspregs *)&target->thread.dsp_status.dsp_regs;
	257	int ret;
	258
	259	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, regs,
	260	0, sizeof(struct pt_dspregs));
	261	if (!ret)
	262	ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
	263	sizeof(struct pt_dspregs), -1);
	264
	265	return ret;
	266	}
	267
	268	static int dspregs_active(struct task_struct *target,
	269	const struct user_regset *regset)
	270	{
	271	struct pt_regs *regs = task_pt_regs(target);
	272
	273	return regs->sr & SR_DSP ? regset->n : 0;
	274	}
	275	#endif
	276
	277	const struct pt_regs_offset regoffset_table[] = {
	278	REGS_OFFSET_NAME(0),
	279	REGS_OFFSET_NAME(1),
	280	REGS_OFFSET_NAME(2),
	281	REGS_OFFSET_NAME(3),
	282	REGS_OFFSET_NAME(4),
	283	REGS_OFFSET_NAME(5),
	284	REGS_OFFSET_NAME(6),
	285	REGS_OFFSET_NAME(7),
	286	REGS_OFFSET_NAME(8),
	287	REGS_OFFSET_NAME(9),
	288	REGS_OFFSET_NAME(10),
	289	REGS_OFFSET_NAME(11),
	290	REGS_OFFSET_NAME(12),
	291	REGS_OFFSET_NAME(13),
	292	REGS_OFFSET_NAME(14),
	293	REGS_OFFSET_NAME(15),
	294	REG_OFFSET_NAME(pc),
	295	REG_OFFSET_NAME(pr),
	296	REG_OFFSET_NAME(sr),
	297	REG_OFFSET_NAME(gbr),
	298	REG_OFFSET_NAME(mach),
	299	REG_OFFSET_NAME(macl),
	300	REG_OFFSET_NAME(tra),
	301	REG_OFFSET_END,
	302	};
	303
	304	/*
	305	* These are our native regset flavours.
	306	*/
	307	enum sh_regset {
	308	REGSET_GENERAL,
	309	#ifdef CONFIG_SH_FPU
	310	REGSET_FPU,
	311	#endif
	312	#ifdef CONFIG_SH_DSP
	313	REGSET_DSP,
	314	#endif
	315	};
	316
	317	static const struct user_regset sh_regsets[] = {
	318	/*
	319	* Format is:
	320	* R0 --> R15
	321	* PC, PR, SR, GBR, MACH, MACL, TRA
	322	*/
	323	[REGSET_GENERAL] = {
	324	.core_note_type = NT_PRSTATUS,
	325	.n = ELF_NGREG,
	326	.size = sizeof(long),
	327	.align = sizeof(long),
	328	.get = genregs_get,
	329	.set = genregs_set,
	330	},
	331
	332	#ifdef CONFIG_SH_FPU
	333	[REGSET_FPU] = {
	334	.core_note_type = NT_PRFPREG,
	335	.n = sizeof(struct user_fpu_struct) / sizeof(long),
	336	.size = sizeof(long),
	337	.align = sizeof(long),
	338	.get = fpregs_get,
	339	.set = fpregs_set,
	340	.active = fpregs_active,
	341	},
	342	#endif
	343
	344	#ifdef CONFIG_SH_DSP
	345	[REGSET_DSP] = {
	346	.n = sizeof(struct pt_dspregs) / sizeof(long),
	347	.size = sizeof(long),
	348	.align = sizeof(long),
	349	.get = dspregs_get,
	350	.set = dspregs_set,
	351	.active = dspregs_active,
	352	},
	353	#endif
	354	};
	355
	356	static const struct user_regset_view user_sh_native_view = {
	357	.name = "sh",
	358	.e_machine = EM_SH,
	359	.regsets = sh_regsets,
	360	.n = ARRAY_SIZE(sh_regsets),
	361	};
	362
	363	const struct user_regset_view task_user_regset_view(struct task_struct task)
	364	{
	365	return &user_sh_native_view;
	366	}
	367
	368	long arch_ptrace(struct task_struct *child, long request, long addr, long data)
	369	{
	370	struct user * dummy = NULL;
	371	unsigned long __user datap = (unsigned long __user )data;
	372	int ret;
	373
	374	switch (request) {
	375	/* read the word at location addr in the USER area. */
	376	case PTRACE_PEEKUSR: {
	377	unsigned long tmp;
	378
	379	ret = -EIO;
	380	if ((addr & 3) \|\| addr < 0 \|\|
	381	addr > sizeof(struct user) - 3)
	382	break;
	383
	384	if (addr < sizeof(struct pt_regs))
	385	tmp = get_stack_long(child, addr);
	386	else if (addr >= (long) &dummy->fpu &&
	387	addr < (long) &dummy->u_fpvalid) {
	388	if (!tsk_used_math(child)) {
	389	if (addr == (long)&dummy->fpu.fpscr)
	390	tmp = FPSCR_INIT;
	391	else
	392	tmp = 0;
	393	} else
	394	tmp = ((long *)child->thread.xstate)
	395	[(addr - (long)&dummy->fpu) >> 2];
	396	} else if (addr == (long) &dummy->u_fpvalid)
	397	tmp = !!tsk_used_math(child);
	398	else if (addr == PT_TEXT_ADDR)
	399	tmp = child->mm->start_code;
	400	else if (addr == PT_DATA_ADDR)
	401	tmp = child->mm->start_data;
	402	else if (addr == PT_TEXT_END_ADDR)
	403	tmp = child->mm->end_code;
	404	else if (addr == PT_TEXT_LEN)
	405	tmp = child->mm->end_code - child->mm->start_code;
	406	else
	407	tmp = 0;
	408	ret = put_user(tmp, datap);
	409	break;
	410	}
	411
	412	case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
	413	ret = -EIO;
	414	if ((addr & 3) \|\| addr < 0 \|\|
	415	addr > sizeof(struct user) - 3)
	416	break;
	417
	418	if (addr < sizeof(struct pt_regs))
	419	ret = put_stack_long(child, addr, data);
	420	else if (addr >= (long) &dummy->fpu &&
	421	addr < (long) &dummy->u_fpvalid) {
	422	set_stopped_child_used_math(child);
	423	((long *)child->thread.xstate)
	424	[(addr - (long)&dummy->fpu) >> 2] = data;
	425	ret = 0;
	426	} else if (addr == (long) &dummy->u_fpvalid) {
	427	conditional_stopped_child_used_math(data, child);
	428	ret = 0;
	429	}
	430	break;
	431
	432	case PTRACE_GETREGS:
	433	return copy_regset_to_user(child, &user_sh_native_view,
	434	REGSET_GENERAL,
	435	0, sizeof(struct pt_regs),
	436	(void __user *)data);
	437	case PTRACE_SETREGS:
	438	return copy_regset_from_user(child, &user_sh_native_view,
	439	REGSET_GENERAL,
	440	0, sizeof(struct pt_regs),
	441	(const void __user *)data);
	442	#ifdef CONFIG_SH_FPU
	443	case PTRACE_GETFPREGS:
	444	return copy_regset_to_user(child, &user_sh_native_view,
	445	REGSET_FPU,
	446	0, sizeof(struct user_fpu_struct),
	447	(void __user *)data);
	448	case PTRACE_SETFPREGS:
	449	return copy_regset_from_user(child, &user_sh_native_view,
	450	REGSET_FPU,
	451	0, sizeof(struct user_fpu_struct),
	452	(const void __user *)data);
	453	#endif
	454	#ifdef CONFIG_SH_DSP
	455	case PTRACE_GETDSPREGS:
	456	return copy_regset_to_user(child, &user_sh_native_view,
	457	REGSET_DSP,
	458	0, sizeof(struct pt_dspregs),
	459	(void __user *)data);
	460	case PTRACE_SETDSPREGS:
	461	return copy_regset_from_user(child, &user_sh_native_view,
	462	REGSET_DSP,
	463	0, sizeof(struct pt_dspregs),
	464	(const void __user *)data);
	465	#endif
	466	default:
	467	ret = ptrace_request(child, request, addr, data);
	468	break;
	469	}
	470
	471	return ret;
	472	}
	473
	474	static inline int audit_arch(void)
	475	{
	476	int arch = EM_SH;
	477
	478	#ifdef CONFIG_CPU_LITTLE_ENDIAN
	479	arch \|= __AUDIT_ARCH_LE;
	480	#endif
	481
	482	return arch;
	483	}
	484
	485	asmlinkage long do_syscall_trace_enter(struct pt_regs *regs)
	486	{
	487	long ret = 0;
	488
	489	secure_computing(regs->regs[0]);
	490
	491	if (test_thread_flag(TIF_SYSCALL_TRACE) &&
	492	tracehook_report_syscall_entry(regs))
	493	/*
	494	* Tracing decided this syscall should not happen.
	495	* We'll return a bogus call number to get an ENOSYS
	496	* error, but leave the original number in regs->regs[0].
	497	*/
	498	ret = -1L;
	499
	500	if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
	501	trace_sys_enter(regs, regs->regs[0]);
	502
	503	if (unlikely(current->audit_context))
	504	audit_syscall_entry(audit_arch(), regs->regs[3],
	505	regs->regs[4], regs->regs[5],
	506	regs->regs[6], regs->regs[7]);
	507
	508	return ret ?: regs->regs[0];
	509	}
	510
	511	asmlinkage void do_syscall_trace_leave(struct pt_regs *regs)
	512	{
	513	int step;
	514
	515	if (unlikely(current->audit_context))
	516	audit_syscall_exit(AUDITSC_RESULT(regs->regs[0]),
	517	regs->regs[0]);
	518
	519	if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
	520	trace_sys_exit(regs, regs->regs[0]);
	521
	522	step = test_thread_flag(TIF_SINGLESTEP);
	523	if (step \|\| test_thread_flag(TIF_SYSCALL_TRACE))
	524	tracehook_report_syscall_exit(regs, step);
	525	}