[mirror_ubuntu-hirsute-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/sched/task_stack.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 <linux/uaccess.h>
#include <asm/pgtable.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,
		      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,
						 NULL, tsk);
		if (IS_ERR(bp))
			return PTR_ERR(bp);

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

		attr = bp->attr;
		attr.bp_addr = addr;
		/* reenable breakpoint */
		attr.disabled = false;
		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,
		 unsigned long addr, unsigned long data)
{
	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 >= offsetof(struct user, fpu) &&
			 addr < offsetof(struct user, u_fpvalid)) {
			if (!tsk_used_math(child)) {
				if (addr == offsetof(struct user, fpu.fpscr))
					tmp = FPSCR_INIT;
				else
					tmp = 0;
			} else {
				unsigned long index;
				ret = init_fpu(child);
				if (ret)
					break;
				index = addr - offsetof(struct user, fpu);
				tmp = ((unsigned long *)child->thread.xstate)
					[index >> 2];
			}
		} else if (addr == offsetof(struct user, 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 >= 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);
			set_stopped_child_used_math(child);
			((unsigned long *)child->thread.xstate)
				[index >> 2] = data;
			ret = 0;
		} else if (addr == offsetof(struct user, 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),
					   datap);
	case PTRACE_SETREGS:
		return copy_regset_from_user(child, &user_sh_native_view,
					     REGSET_GENERAL,
					     0, sizeof(struct pt_regs),
					     datap);
#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),
					   datap);
	case PTRACE_SETFPREGS:
		return copy_regset_from_user(child, &user_sh_native_view,
					     REGSET_FPU,
					     0, sizeof(struct user_fpu_struct),
					     datap);
#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),
					   datap);
	case PTRACE_SETDSPREGS:
		return copy_regset_from_user(child, &user_sh_native_view,
					     REGSET_DSP,
					     0, sizeof(struct pt_dspregs),
					     datap);
#endif
	default:
		ret = ptrace_request(child, request, addr, data);
		break;
	}

	return ret;
}

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

	secure_computing_strict(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]);

	audit_syscall_entry(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;

	audit_syscall_exit(regs);

	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
1da177e4	1	/*
934135c1	2	* SuperH process tracing
1da177e4	3	*
934135c1	4	* Copyright (C) 1999, 2000 Kaz Kojima & Niibe Yutaka
34d0b5af	5	* Copyright (C) 2002 - 2009 Paul Mundt
1da177e4	6	*
934135c1 PM	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.
1da177e4	12	*/
1da177e4 LT	13	#include <linux/kernel.h>
1da177e4 LT	14	#include <linux/sched.h>
68db0cf1	15	#include <linux/sched/task_stack.h>
1da177e4 LT	16	#include <linux/mm.h>
1da177e4 LT	17	#include <linux/smp.h>
1da177e4 LT	18	#include <linux/errno.h>
	19	#include <linux/ptrace.h>
	20	#include <linux/user.h>
1da177e4	21	#include <linux/security.h>
7ed20e1a	22	#include <linux/signal.h>
9432f968	23	#include <linux/io.h>
1322b9de	24	#include <linux/audit.h>
c4637d47	25	#include <linux/seccomp.h>
ab99c733	26	#include <linux/tracehook.h>
934135c1 PM	27	#include <linux/elf.h>
934135c1 PM	28	#include <linux/regset.h>
34d0b5af	29	#include <linux/hw_breakpoint.h>
7c0f6ba6	30	#include <linux/uaccess.h>
1da177e4	31	#include <asm/pgtable.h>
1da177e4 LT	32	#include <asm/processor.h>
1da177e4 LT	33	#include <asm/mmu_context.h>
fa43972f	34	#include <asm/syscalls.h>
e7ab3cd2	35	#include <asm/fpu.h>
1da177e4	36
a74f7e04 PM	37	#define CREATE_TRACE_POINTS
a74f7e04 PM	38	#include <trace/events/syscalls.h>
c652d780	39
1da177e4 LT	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
3cf0f4ec	47	stack = (unsigned char *)task_pt_regs(task);
1da177e4 LT	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
3cf0f4ec	60	stack = (unsigned char *)task_pt_regs(task);
1da177e4 LT	61	stack += offset;
	62	(unsigned long ) stack = data;
	63	return 0;
	64	}
	65
a8b0ca17	66	void ptrace_triggered(struct perf_event *bp,
34d0b5af	67	struct perf_sample_data data, struct pt_regs regs)
c459dbf2	68	{
34d0b5af PM	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)
c459dbf2	81	{
34d0b5af PM	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) {
73266fc1	88	ptrace_breakpoint_init(&attr);
34d0b5af PM	89
	90	attr.bp_addr = addr;
	91	attr.bp_len = HW_BREAKPOINT_LEN_2;
	92	attr.bp_type = HW_BREAKPOINT_R;
c459dbf2	93
4dc0da86 AK	94	bp = register_user_hw_breakpoint(&attr, ptrace_triggered,
4dc0da86 AK	95	NULL, tsk);
34d0b5af PM	96	if (IS_ERR(bp))
	97	return PTR_ERR(bp);
	98
	99	thread->ptrace_bps[0] = bp;
	100	} else {
	101	int err;
	102
	103	attr = bp->attr;
	104	attr.bp_addr = addr;
fb7f045a DE	105	/* reenable breakpoint */
fb7f045a DE	106	attr.disabled = false;
34d0b5af PM	107	err = modify_user_hw_breakpoint(bp, &attr);
	108	if (unlikely(err))
	109	return err;
	110	}
	111
	112	return 0;
	113	}
c459dbf2	114
c459dbf2 PM	115	void user_enable_single_step(struct task_struct *child)
c459dbf2 PM	116	{
34d0b5af	117	unsigned long pc = get_stack_long(child, offsetof(struct pt_regs, pc));
c459dbf2 PM	118
c459dbf2 PM	119	set_tsk_thread_flag(child, TIF_SINGLESTEP);
34d0b5af PM	120
34d0b5af PM	121	set_single_step(child, pc);
c459dbf2 PM	122	}
	123
	124	void user_disable_single_step(struct task_struct *child)
9432f968 SM	125	{
9432f968 SM	126	clear_tsk_thread_flag(child, TIF_SINGLESTEP);
9432f968 SM	127	}
9432f968 SM	128
1da177e4 LT	129	/*
	130	* Called by kernel/ptrace.c when detaching..
	131	*
	132	* Make sure single step bits etc are not set.
	133	*/
	134	void ptrace_disable(struct task_struct *child)
	135	{
c459dbf2	136	user_disable_single_step(child);
1da177e4 LT	137	}
1da177e4 LT	138
934135c1 PM	139	static int genregs_get(struct task_struct *target,
	140	const struct user_regset *regset,
	141	unsigned int pos, unsigned int count,
	142	void kbuf, void __user ubuf)
	143	{
	144	const struct pt_regs *regs = task_pt_regs(target);
	145	int ret;
	146
	147	ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
	148	regs->regs,
	149	0, 16 * sizeof(unsigned long));
	150	if (!ret)
	151	/* PC, PR, SR, GBR, MACH, MACL, TRA */
	152	ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
	153	&regs->pc,
	154	offsetof(struct pt_regs, pc),
	155	sizeof(struct pt_regs));
	156	if (!ret)
	157	ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
	158	sizeof(struct pt_regs), -1);
	159
	160	return ret;
	161	}
	162
	163	static int genregs_set(struct task_struct *target,
	164	const struct user_regset *regset,
	165	unsigned int pos, unsigned int count,
	166	const void kbuf, const void __user ubuf)
	167	{
	168	struct pt_regs *regs = task_pt_regs(target);
	169	int ret;
	170
	171	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
	172	regs->regs,
	173	0, 16 * sizeof(unsigned long));
	174	if (!ret && count > 0)
	175	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
	176	&regs->pc,
	177	offsetof(struct pt_regs, pc),
	178	sizeof(struct pt_regs));
	179	if (!ret)
	180	ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
	181	sizeof(struct pt_regs), -1);
	182
	183	return ret;
	184	}
	185
e7ab3cd2 PM	186	#ifdef CONFIG_SH_FPU
	187	int fpregs_get(struct task_struct *target,
	188	const struct user_regset *regset,
	189	unsigned int pos, unsigned int count,
	190	void kbuf, void __user ubuf)
	191	{
	192	int ret;
	193
	194	ret = init_fpu(target);
	195	if (ret)
	196	return ret;
	197
	198	if ((boot_cpu_data.flags & CPU_HAS_FPU))
	199	return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
0ea820cf	200	&target->thread.xstate->hardfpu, 0, -1);
e7ab3cd2 PM	201
e7ab3cd2 PM	202	return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
0ea820cf	203	&target->thread.xstate->softfpu, 0, -1);
e7ab3cd2 PM	204	}
	205
	206	static int fpregs_set(struct task_struct *target,
	207	const struct user_regset *regset,
	208	unsigned int pos, unsigned int count,
	209	const void kbuf, const void __user ubuf)
	210	{
	211	int ret;
	212
	213	ret = init_fpu(target);
	214	if (ret)
	215	return ret;
	216
	217	set_stopped_child_used_math(target);
	218
	219	if ((boot_cpu_data.flags & CPU_HAS_FPU))
	220	return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
0ea820cf	221	&target->thread.xstate->hardfpu, 0, -1);
e7ab3cd2 PM	222
e7ab3cd2 PM	223	return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
0ea820cf	224	&target->thread.xstate->softfpu, 0, -1);
e7ab3cd2 PM	225	}
	226
	227	static int fpregs_active(struct task_struct *target,
	228	const struct user_regset *regset)
	229	{
	230	return tsk_used_math(target) ? regset->n : 0;
	231	}
	232	#endif
	233
5dadb343 PM	234	#ifdef CONFIG_SH_DSP
	235	static int dspregs_get(struct task_struct *target,
	236	const struct user_regset *regset,
	237	unsigned int pos, unsigned int count,
	238	void kbuf, void __user ubuf)
	239	{
01ab1039 MT	240	const struct pt_dspregs *regs =
01ab1039 MT	241	(struct pt_dspregs *)&target->thread.dsp_status.dsp_regs;
5dadb343 PM	242	int ret;
	243
	244	ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, regs,
	245	0, sizeof(struct pt_dspregs));
	246	if (!ret)
	247	ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
	248	sizeof(struct pt_dspregs), -1);
	249
	250	return ret;
	251	}
	252
	253	static int dspregs_set(struct task_struct *target,
	254	const struct user_regset *regset,
	255	unsigned int pos, unsigned int count,
	256	const void kbuf, const void __user ubuf)
	257	{
01ab1039 MT	258	struct pt_dspregs *regs =
01ab1039 MT	259	(struct pt_dspregs *)&target->thread.dsp_status.dsp_regs;
5dadb343 PM	260	int ret;
	261
	262	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, regs,
	263	0, sizeof(struct pt_dspregs));
	264	if (!ret)
	265	ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
	266	sizeof(struct pt_dspregs), -1);
	267
	268	return ret;
	269	}
72461997 PM	270
	271	static int dspregs_active(struct task_struct *target,
	272	const struct user_regset *regset)
	273	{
	274	struct pt_regs *regs = task_pt_regs(target);
	275
	276	return regs->sr & SR_DSP ? regset->n : 0;
	277	}
5dadb343 PM	278	#endif
5dadb343 PM	279
eaaaeef3 PM	280	const struct pt_regs_offset regoffset_table[] = {
	281	REGS_OFFSET_NAME(0),
	282	REGS_OFFSET_NAME(1),
	283	REGS_OFFSET_NAME(2),
	284	REGS_OFFSET_NAME(3),
	285	REGS_OFFSET_NAME(4),
	286	REGS_OFFSET_NAME(5),
	287	REGS_OFFSET_NAME(6),
	288	REGS_OFFSET_NAME(7),
	289	REGS_OFFSET_NAME(8),
	290	REGS_OFFSET_NAME(9),
	291	REGS_OFFSET_NAME(10),
	292	REGS_OFFSET_NAME(11),
	293	REGS_OFFSET_NAME(12),
	294	REGS_OFFSET_NAME(13),
	295	REGS_OFFSET_NAME(14),
	296	REGS_OFFSET_NAME(15),
	297	REG_OFFSET_NAME(pc),
	298	REG_OFFSET_NAME(pr),
	299	REG_OFFSET_NAME(sr),
	300	REG_OFFSET_NAME(gbr),
	301	REG_OFFSET_NAME(mach),
	302	REG_OFFSET_NAME(macl),
	303	REG_OFFSET_NAME(tra),
	304	REG_OFFSET_END,
	305	};
	306
934135c1 PM	307	/*
	308	* These are our native regset flavours.
	309	*/
	310	enum sh_regset {
	311	REGSET_GENERAL,
e7ab3cd2 PM	312	#ifdef CONFIG_SH_FPU
	313	REGSET_FPU,
	314	#endif
5dadb343 PM	315	#ifdef CONFIG_SH_DSP
	316	REGSET_DSP,
	317	#endif
934135c1 PM	318	};
	319
	320	static const struct user_regset sh_regsets[] = {
	321	/*
	322	* Format is:
	323	* R0 --> R15
	324	* PC, PR, SR, GBR, MACH, MACL, TRA
	325	*/
	326	[REGSET_GENERAL] = {
	327	.core_note_type = NT_PRSTATUS,
	328	.n = ELF_NGREG,
	329	.size = sizeof(long),
	330	.align = sizeof(long),
	331	.get = genregs_get,
	332	.set = genregs_set,
	333	},
5dadb343	334
e7ab3cd2 PM	335	#ifdef CONFIG_SH_FPU
	336	[REGSET_FPU] = {
	337	.core_note_type = NT_PRFPREG,
	338	.n = sizeof(struct user_fpu_struct) / sizeof(long),
	339	.size = sizeof(long),
	340	.align = sizeof(long),
	341	.get = fpregs_get,
	342	.set = fpregs_set,
	343	.active = fpregs_active,
	344	},
	345	#endif
	346
5dadb343 PM	347	#ifdef CONFIG_SH_DSP
	348	[REGSET_DSP] = {
	349	.n = sizeof(struct pt_dspregs) / sizeof(long),
	350	.size = sizeof(long),
	351	.align = sizeof(long),
	352	.get = dspregs_get,
	353	.set = dspregs_set,
72461997	354	.active = dspregs_active,
5dadb343 PM	355	},
5dadb343 PM	356	#endif
934135c1 PM	357	};
	358
	359	static const struct user_regset_view user_sh_native_view = {
	360	.name = "sh",
	361	.e_machine = EM_SH,
	362	.regsets = sh_regsets,
	363	.n = ARRAY_SIZE(sh_regsets),
	364	};
	365
f9540ece PM	366	const struct user_regset_view task_user_regset_view(struct task_struct task)
	367	{
	368	return &user_sh_native_view;
	369	}
	370
9b05a69e NK	371	long arch_ptrace(struct task_struct *child, long request,
9b05a69e NK	372	unsigned long addr, unsigned long data)
1da177e4	373	{
fa43972f	374	unsigned long __user datap = (unsigned long __user )data;
1da177e4 LT	375	int ret;
1da177e4 LT	376
1da177e4	377	switch (request) {
1da177e4 LT	378	/* read the word at location addr in the USER area. */
	379	case PTRACE_PEEKUSR: {
	380	unsigned long tmp;
	381
	382	ret = -EIO;
9432f968	383	if ((addr & 3) \|\| addr < 0 \|\|
1da177e4 LT	384	addr > sizeof(struct user) - 3)
	385	break;
	386
	387	if (addr < sizeof(struct pt_regs))
	388	tmp = get_stack_long(child, addr);
9e1cb206 NK	389	else if (addr >= offsetof(struct user, fpu) &&
9e1cb206 NK	390	addr < offsetof(struct user, u_fpvalid)) {
1da177e4	391	if (!tsk_used_math(child)) {
9e1cb206	392	if (addr == offsetof(struct user, fpu.fpscr))
1da177e4 LT	393	tmp = FPSCR_INIT;
	394	else
	395	tmp = 0;
9e1cb206 NK	396	} else {
9e1cb206 NK	397	unsigned long index;
c49b6ecf PE	398	ret = init_fpu(child);
	399	if (ret)
	400	break;
9e1cb206	401	index = addr - offsetof(struct user, fpu);
9b05a69e	402	tmp = ((unsigned long *)child->thread.xstate)
9e1cb206 NK	403	[index >> 2];
	404	}
	405	} else if (addr == offsetof(struct user, u_fpvalid))
1da177e4	406	tmp = !!tsk_used_math(child);
ba0d4740 PG	407	else if (addr == PT_TEXT_ADDR)
	408	tmp = child->mm->start_code;
	409	else if (addr == PT_DATA_ADDR)
	410	tmp = child->mm->start_data;
	411	else if (addr == PT_TEXT_END_ADDR)
	412	tmp = child->mm->end_code;
	413	else if (addr == PT_TEXT_LEN)
	414	tmp = child->mm->end_code - child->mm->start_code;
1da177e4 LT	415	else
1da177e4 LT	416	tmp = 0;
fa43972f	417	ret = put_user(tmp, datap);
1da177e4 LT	418	break;
	419	}
	420
1da177e4 LT	421	case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
1da177e4 LT	422	ret = -EIO;
9432f968	423	if ((addr & 3) \|\| addr < 0 \|\|
1da177e4 LT	424	addr > sizeof(struct user) - 3)
	425	break;
	426
	427	if (addr < sizeof(struct pt_regs))
	428	ret = put_stack_long(child, addr, data);
9e1cb206 NK	429	else if (addr >= offsetof(struct user, fpu) &&
	430	addr < offsetof(struct user, u_fpvalid)) {
	431	unsigned long index;
c49b6ecf PE	432	ret = init_fpu(child);
	433	if (ret)
	434	break;
9e1cb206	435	index = addr - offsetof(struct user, fpu);
1da177e4	436	set_stopped_child_used_math(child);
9b05a69e	437	((unsigned long *)child->thread.xstate)
9e1cb206	438	[index >> 2] = data;
1da177e4	439	ret = 0;
9e1cb206	440	} else if (addr == offsetof(struct user, u_fpvalid)) {
1da177e4 LT	441	conditional_stopped_child_used_math(data, child);
	442	ret = 0;
	443	}
	444	break;
	445
934135c1 PM	446	case PTRACE_GETREGS:
	447	return copy_regset_to_user(child, &user_sh_native_view,
	448	REGSET_GENERAL,
	449	0, sizeof(struct pt_regs),
9e1cb206	450	datap);
934135c1 PM	451	case PTRACE_SETREGS:
	452	return copy_regset_from_user(child, &user_sh_native_view,
	453	REGSET_GENERAL,
	454	0, sizeof(struct pt_regs),
9e1cb206	455	datap);
e7ab3cd2 PM	456	#ifdef CONFIG_SH_FPU
	457	case PTRACE_GETFPREGS:
	458	return copy_regset_to_user(child, &user_sh_native_view,
	459	REGSET_FPU,
	460	0, sizeof(struct user_fpu_struct),
9e1cb206	461	datap);
e7ab3cd2 PM	462	case PTRACE_SETFPREGS:
	463	return copy_regset_from_user(child, &user_sh_native_view,
	464	REGSET_FPU,
	465	0, sizeof(struct user_fpu_struct),
9e1cb206	466	datap);
e7ab3cd2	467	#endif
1da177e4	468	#ifdef CONFIG_SH_DSP
5dadb343 PM	469	case PTRACE_GETDSPREGS:
	470	return copy_regset_to_user(child, &user_sh_native_view,
	471	REGSET_DSP,
	472	0, sizeof(struct pt_dspregs),
9e1cb206	473	datap);
5dadb343 PM	474	case PTRACE_SETDSPREGS:
	475	return copy_regset_from_user(child, &user_sh_native_view,
	476	REGSET_DSP,
	477	0, sizeof(struct pt_dspregs),
9e1cb206	478	datap);
1da177e4 LT	479	#endif
	480	default:
	481	ret = ptrace_request(child, request, addr, data);
	482	break;
	483	}
481bed45	484
1da177e4 LT	485	return ret;
	486	}
	487
ab99c733	488	asmlinkage long do_syscall_trace_enter(struct pt_regs *regs)
1da177e4	489	{
ab99c733	490	long ret = 0;
1da177e4	491
e4da89d0	492	secure_computing_strict(regs->regs[0]);
c4637d47	493
ab99c733 PM	494	if (test_thread_flag(TIF_SYSCALL_TRACE) &&
	495	tracehook_report_syscall_entry(regs))
	496	/*
	497	* Tracing decided this syscall should not happen.
	498	* We'll return a bogus call number to get an ENOSYS
	499	* error, but leave the original number in regs->regs[0].
	500	*/
	501	ret = -1L;
1322b9de	502
a74f7e04 PM	503	if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
a74f7e04 PM	504	trace_sys_enter(regs, regs->regs[0]);
c652d780	505
91397401	506	audit_syscall_entry(regs->regs[3], regs->regs[4], regs->regs[5],
b05d8447	507	regs->regs[6], regs->regs[7]);
1322b9de	508
ab99c733 PM	509	return ret ?: regs->regs[0];
	510	}
	511
	512	asmlinkage void do_syscall_trace_leave(struct pt_regs *regs)
	513	{
	514	int step;
	515
d7e7528b	516	audit_syscall_exit(regs);
ab99c733	517
a74f7e04 PM	518	if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
a74f7e04 PM	519	trace_sys_exit(regs, regs->regs[0]);
c652d780	520
ab99c733 PM	521	step = test_thread_flag(TIF_SINGLESTEP);
	522	if (step \|\| test_thread_flag(TIF_SYSCALL_TRACE))
	523	tracehook_report_syscall_exit(regs, step);
1da177e4	524	}