[thirdparty/linux.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 <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>
	14	#include <linux/sched.h>
	15	#include <linux/mm.h>
	16	#include <linux/smp.h>
1da177e4 LT	17	#include <linux/errno.h>
	18	#include <linux/ptrace.h>
	19	#include <linux/user.h>
1da177e4	20	#include <linux/security.h>
7ed20e1a	21	#include <linux/signal.h>
9432f968	22	#include <linux/io.h>
1322b9de	23	#include <linux/audit.h>
c4637d47	24	#include <linux/seccomp.h>
ab99c733	25	#include <linux/tracehook.h>
934135c1 PM	26	#include <linux/elf.h>
934135c1 PM	27	#include <linux/regset.h>
34d0b5af	28	#include <linux/hw_breakpoint.h>
7c0f6ba6	29	#include <linux/uaccess.h>
1da177e4	30	#include <asm/pgtable.h>
1da177e4 LT	31	#include <asm/processor.h>
1da177e4 LT	32	#include <asm/mmu_context.h>
fa43972f	33	#include <asm/syscalls.h>
e7ab3cd2	34	#include <asm/fpu.h>
1da177e4	35
a74f7e04 PM	36	#define CREATE_TRACE_POINTS
a74f7e04 PM	37	#include <trace/events/syscalls.h>
c652d780	38
1da177e4 LT	39	/*
	40	* This routine will get a word off of the process kernel stack.
	41	*/
	42	static inline int get_stack_long(struct task_struct *task, int offset)
	43	{
	44	unsigned char *stack;
	45
3cf0f4ec	46	stack = (unsigned char *)task_pt_regs(task);
1da177e4 LT	47	stack += offset;
	48	return (((int )stack));
	49	}
	50
	51	/*
	52	* This routine will put a word on the process kernel stack.
	53	*/
	54	static inline int put_stack_long(struct task_struct *task, int offset,
	55	unsigned long data)
	56	{
	57	unsigned char *stack;
	58
3cf0f4ec	59	stack = (unsigned char *)task_pt_regs(task);
1da177e4 LT	60	stack += offset;
	61	(unsigned long ) stack = data;
	62	return 0;
	63	}
	64
a8b0ca17	65	void ptrace_triggered(struct perf_event *bp,
34d0b5af	66	struct perf_sample_data data, struct pt_regs regs)
c459dbf2	67	{
34d0b5af PM	68	struct perf_event_attr attr;
	69
	70	/*
	71	* Disable the breakpoint request here since ptrace has defined a
	72	* one-shot behaviour for breakpoint exceptions.
	73	*/
	74	attr = bp->attr;
	75	attr.disabled = true;
	76	modify_user_hw_breakpoint(bp, &attr);
	77	}
	78
	79	static int set_single_step(struct task_struct *tsk, unsigned long addr)
c459dbf2	80	{
34d0b5af PM	81	struct thread_struct *thread = &tsk->thread;
	82	struct perf_event *bp;
	83	struct perf_event_attr attr;
	84
	85	bp = thread->ptrace_bps[0];
	86	if (!bp) {
73266fc1	87	ptrace_breakpoint_init(&attr);
34d0b5af PM	88
	89	attr.bp_addr = addr;
	90	attr.bp_len = HW_BREAKPOINT_LEN_2;
	91	attr.bp_type = HW_BREAKPOINT_R;
c459dbf2	92
4dc0da86 AK	93	bp = register_user_hw_breakpoint(&attr, ptrace_triggered,
4dc0da86 AK	94	NULL, tsk);
34d0b5af PM	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;
fb7f045a DE	104	/* reenable breakpoint */
fb7f045a DE	105	attr.disabled = false;
34d0b5af PM	106	err = modify_user_hw_breakpoint(bp, &attr);
	107	if (unlikely(err))
	108	return err;
	109	}
	110
	111	return 0;
	112	}
c459dbf2	113
c459dbf2 PM	114	void user_enable_single_step(struct task_struct *child)
c459dbf2 PM	115	{
34d0b5af	116	unsigned long pc = get_stack_long(child, offsetof(struct pt_regs, pc));
c459dbf2 PM	117
c459dbf2 PM	118	set_tsk_thread_flag(child, TIF_SINGLESTEP);
34d0b5af PM	119
34d0b5af PM	120	set_single_step(child, pc);
c459dbf2 PM	121	}
	122
	123	void user_disable_single_step(struct task_struct *child)
9432f968 SM	124	{
9432f968 SM	125	clear_tsk_thread_flag(child, TIF_SINGLESTEP);
9432f968 SM	126	}
9432f968 SM	127
1da177e4 LT	128	/*
	129	* Called by kernel/ptrace.c when detaching..
	130	*
	131	* Make sure single step bits etc are not set.
	132	*/
	133	void ptrace_disable(struct task_struct *child)
	134	{
c459dbf2	135	user_disable_single_step(child);
1da177e4 LT	136	}
1da177e4 LT	137
934135c1 PM	138	static int genregs_get(struct task_struct *target,
	139	const struct user_regset *regset,
	140	unsigned int pos, unsigned int count,
	141	void kbuf, void __user ubuf)
	142	{
	143	const struct pt_regs *regs = task_pt_regs(target);
	144	int ret;
	145
	146	ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
	147	regs->regs,
	148	0, 16 * sizeof(unsigned long));
	149	if (!ret)
	150	/* PC, PR, SR, GBR, MACH, MACL, TRA */
	151	ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
	152	&regs->pc,
	153	offsetof(struct pt_regs, pc),
	154	sizeof(struct pt_regs));
	155	if (!ret)
	156	ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
	157	sizeof(struct pt_regs), -1);
	158
	159	return ret;
	160	}
	161
	162	static int genregs_set(struct task_struct *target,
	163	const struct user_regset *regset,
	164	unsigned int pos, unsigned int count,
	165	const void kbuf, const void __user ubuf)
	166	{
	167	struct pt_regs *regs = task_pt_regs(target);
	168	int ret;
	169
	170	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
	171	regs->regs,
	172	0, 16 * sizeof(unsigned long));
	173	if (!ret && count > 0)
	174	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
	175	&regs->pc,
	176	offsetof(struct pt_regs, pc),
	177	sizeof(struct pt_regs));
	178	if (!ret)
	179	ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
	180	sizeof(struct pt_regs), -1);
	181
	182	return ret;
	183	}
	184
e7ab3cd2 PM	185	#ifdef CONFIG_SH_FPU
	186	int fpregs_get(struct task_struct *target,
	187	const struct user_regset *regset,
	188	unsigned int pos, unsigned int count,
	189	void kbuf, void __user ubuf)
	190	{
	191	int ret;
	192
	193	ret = init_fpu(target);
	194	if (ret)
	195	return ret;
	196
	197	if ((boot_cpu_data.flags & CPU_HAS_FPU))
	198	return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
0ea820cf	199	&target->thread.xstate->hardfpu, 0, -1);
e7ab3cd2 PM	200
e7ab3cd2 PM	201	return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
0ea820cf	202	&target->thread.xstate->softfpu, 0, -1);
e7ab3cd2 PM	203	}
	204
	205	static int fpregs_set(struct task_struct *target,
	206	const struct user_regset *regset,
	207	unsigned int pos, unsigned int count,
	208	const void kbuf, const void __user ubuf)
	209	{
	210	int ret;
	211
	212	ret = init_fpu(target);
	213	if (ret)
	214	return ret;
	215
	216	set_stopped_child_used_math(target);
	217
	218	if ((boot_cpu_data.flags & CPU_HAS_FPU))
	219	return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
0ea820cf	220	&target->thread.xstate->hardfpu, 0, -1);
e7ab3cd2 PM	221
e7ab3cd2 PM	222	return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
0ea820cf	223	&target->thread.xstate->softfpu, 0, -1);
e7ab3cd2 PM	224	}
	225
	226	static int fpregs_active(struct task_struct *target,
	227	const struct user_regset *regset)
	228	{
	229	return tsk_used_math(target) ? regset->n : 0;
	230	}
	231	#endif
	232
5dadb343 PM	233	#ifdef CONFIG_SH_DSP
	234	static int dspregs_get(struct task_struct *target,
	235	const struct user_regset *regset,
	236	unsigned int pos, unsigned int count,
	237	void kbuf, void __user ubuf)
	238	{
01ab1039 MT	239	const struct pt_dspregs *regs =
01ab1039 MT	240	(struct pt_dspregs *)&target->thread.dsp_status.dsp_regs;
5dadb343 PM	241	int ret;
	242
	243	ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, regs,
	244	0, sizeof(struct pt_dspregs));
	245	if (!ret)
	246	ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
	247	sizeof(struct pt_dspregs), -1);
	248
	249	return ret;
	250	}
	251
	252	static int dspregs_set(struct task_struct *target,
	253	const struct user_regset *regset,
	254	unsigned int pos, unsigned int count,
	255	const void kbuf, const void __user ubuf)
	256	{
01ab1039 MT	257	struct pt_dspregs *regs =
01ab1039 MT	258	(struct pt_dspregs *)&target->thread.dsp_status.dsp_regs;
5dadb343 PM	259	int ret;
	260
	261	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, regs,
	262	0, sizeof(struct pt_dspregs));
	263	if (!ret)
	264	ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
	265	sizeof(struct pt_dspregs), -1);
	266
	267	return ret;
	268	}
72461997 PM	269
	270	static int dspregs_active(struct task_struct *target,
	271	const struct user_regset *regset)
	272	{
	273	struct pt_regs *regs = task_pt_regs(target);
	274
	275	return regs->sr & SR_DSP ? regset->n : 0;
	276	}
5dadb343 PM	277	#endif
5dadb343 PM	278
eaaaeef3 PM	279	const struct pt_regs_offset regoffset_table[] = {
	280	REGS_OFFSET_NAME(0),
	281	REGS_OFFSET_NAME(1),
	282	REGS_OFFSET_NAME(2),
	283	REGS_OFFSET_NAME(3),
	284	REGS_OFFSET_NAME(4),
	285	REGS_OFFSET_NAME(5),
	286	REGS_OFFSET_NAME(6),
	287	REGS_OFFSET_NAME(7),
	288	REGS_OFFSET_NAME(8),
	289	REGS_OFFSET_NAME(9),
	290	REGS_OFFSET_NAME(10),
	291	REGS_OFFSET_NAME(11),
	292	REGS_OFFSET_NAME(12),
	293	REGS_OFFSET_NAME(13),
	294	REGS_OFFSET_NAME(14),
	295	REGS_OFFSET_NAME(15),
	296	REG_OFFSET_NAME(pc),
	297	REG_OFFSET_NAME(pr),
	298	REG_OFFSET_NAME(sr),
	299	REG_OFFSET_NAME(gbr),
	300	REG_OFFSET_NAME(mach),
	301	REG_OFFSET_NAME(macl),
	302	REG_OFFSET_NAME(tra),
	303	REG_OFFSET_END,
	304	};
	305
934135c1 PM	306	/*
	307	* These are our native regset flavours.
	308	*/
	309	enum sh_regset {
	310	REGSET_GENERAL,
e7ab3cd2 PM	311	#ifdef CONFIG_SH_FPU
	312	REGSET_FPU,
	313	#endif
5dadb343 PM	314	#ifdef CONFIG_SH_DSP
	315	REGSET_DSP,
	316	#endif
934135c1 PM	317	};
	318
	319	static const struct user_regset sh_regsets[] = {
	320	/*
	321	* Format is:
	322	* R0 --> R15
	323	* PC, PR, SR, GBR, MACH, MACL, TRA
	324	*/
	325	[REGSET_GENERAL] = {
	326	.core_note_type = NT_PRSTATUS,
	327	.n = ELF_NGREG,
	328	.size = sizeof(long),
	329	.align = sizeof(long),
	330	.get = genregs_get,
	331	.set = genregs_set,
	332	},
5dadb343	333
e7ab3cd2 PM	334	#ifdef CONFIG_SH_FPU
	335	[REGSET_FPU] = {
	336	.core_note_type = NT_PRFPREG,
	337	.n = sizeof(struct user_fpu_struct) / sizeof(long),
	338	.size = sizeof(long),
	339	.align = sizeof(long),
	340	.get = fpregs_get,
	341	.set = fpregs_set,
	342	.active = fpregs_active,
	343	},
	344	#endif
	345
5dadb343 PM	346	#ifdef CONFIG_SH_DSP
	347	[REGSET_DSP] = {
	348	.n = sizeof(struct pt_dspregs) / sizeof(long),
	349	.size = sizeof(long),
	350	.align = sizeof(long),
	351	.get = dspregs_get,
	352	.set = dspregs_set,
72461997	353	.active = dspregs_active,
5dadb343 PM	354	},
5dadb343 PM	355	#endif
934135c1 PM	356	};
	357
	358	static const struct user_regset_view user_sh_native_view = {
	359	.name = "sh",
	360	.e_machine = EM_SH,
	361	.regsets = sh_regsets,
	362	.n = ARRAY_SIZE(sh_regsets),
	363	};
	364
f9540ece PM	365	const struct user_regset_view task_user_regset_view(struct task_struct task)
	366	{
	367	return &user_sh_native_view;
	368	}
	369
9b05a69e NK	370	long arch_ptrace(struct task_struct *child, long request,
9b05a69e NK	371	unsigned long addr, unsigned long data)
1da177e4	372	{
fa43972f	373	unsigned long __user datap = (unsigned long __user )data;
1da177e4 LT	374	int ret;
1da177e4 LT	375
1da177e4	376	switch (request) {
1da177e4 LT	377	/* read the word at location addr in the USER area. */
	378	case PTRACE_PEEKUSR: {
	379	unsigned long tmp;
	380
	381	ret = -EIO;
9432f968	382	if ((addr & 3) \|\| addr < 0 \|\|
1da177e4 LT	383	addr > sizeof(struct user) - 3)
	384	break;
	385
	386	if (addr < sizeof(struct pt_regs))
	387	tmp = get_stack_long(child, addr);
9e1cb206 NK	388	else if (addr >= offsetof(struct user, fpu) &&
9e1cb206 NK	389	addr < offsetof(struct user, u_fpvalid)) {
1da177e4	390	if (!tsk_used_math(child)) {
9e1cb206	391	if (addr == offsetof(struct user, fpu.fpscr))
1da177e4 LT	392	tmp = FPSCR_INIT;
	393	else
	394	tmp = 0;
9e1cb206 NK	395	} else {
9e1cb206 NK	396	unsigned long index;
c49b6ecf PE	397	ret = init_fpu(child);
	398	if (ret)
	399	break;
9e1cb206	400	index = addr - offsetof(struct user, fpu);
9b05a69e	401	tmp = ((unsigned long *)child->thread.xstate)
9e1cb206 NK	402	[index >> 2];
	403	}
	404	} else if (addr == offsetof(struct user, u_fpvalid))
1da177e4	405	tmp = !!tsk_used_math(child);
ba0d4740 PG	406	else if (addr == PT_TEXT_ADDR)
	407	tmp = child->mm->start_code;
	408	else if (addr == PT_DATA_ADDR)
	409	tmp = child->mm->start_data;
	410	else if (addr == PT_TEXT_END_ADDR)
	411	tmp = child->mm->end_code;
	412	else if (addr == PT_TEXT_LEN)
	413	tmp = child->mm->end_code - child->mm->start_code;
1da177e4 LT	414	else
1da177e4 LT	415	tmp = 0;
fa43972f	416	ret = put_user(tmp, datap);
1da177e4 LT	417	break;
	418	}
	419
1da177e4 LT	420	case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
1da177e4 LT	421	ret = -EIO;
9432f968	422	if ((addr & 3) \|\| addr < 0 \|\|
1da177e4 LT	423	addr > sizeof(struct user) - 3)
	424	break;
	425
	426	if (addr < sizeof(struct pt_regs))
	427	ret = put_stack_long(child, addr, data);
9e1cb206 NK	428	else if (addr >= offsetof(struct user, fpu) &&
	429	addr < offsetof(struct user, u_fpvalid)) {
	430	unsigned long index;
c49b6ecf PE	431	ret = init_fpu(child);
	432	if (ret)
	433	break;
9e1cb206	434	index = addr - offsetof(struct user, fpu);
1da177e4	435	set_stopped_child_used_math(child);
9b05a69e	436	((unsigned long *)child->thread.xstate)
9e1cb206	437	[index >> 2] = data;
1da177e4	438	ret = 0;
9e1cb206	439	} else if (addr == offsetof(struct user, u_fpvalid)) {
1da177e4 LT	440	conditional_stopped_child_used_math(data, child);
	441	ret = 0;
	442	}
	443	break;
	444
934135c1 PM	445	case PTRACE_GETREGS:
	446	return copy_regset_to_user(child, &user_sh_native_view,
	447	REGSET_GENERAL,
	448	0, sizeof(struct pt_regs),
9e1cb206	449	datap);
934135c1 PM	450	case PTRACE_SETREGS:
	451	return copy_regset_from_user(child, &user_sh_native_view,
	452	REGSET_GENERAL,
	453	0, sizeof(struct pt_regs),
9e1cb206	454	datap);
e7ab3cd2 PM	455	#ifdef CONFIG_SH_FPU
	456	case PTRACE_GETFPREGS:
	457	return copy_regset_to_user(child, &user_sh_native_view,
	458	REGSET_FPU,
	459	0, sizeof(struct user_fpu_struct),
9e1cb206	460	datap);
e7ab3cd2 PM	461	case PTRACE_SETFPREGS:
	462	return copy_regset_from_user(child, &user_sh_native_view,
	463	REGSET_FPU,
	464	0, sizeof(struct user_fpu_struct),
9e1cb206	465	datap);
e7ab3cd2	466	#endif
1da177e4	467	#ifdef CONFIG_SH_DSP
5dadb343 PM	468	case PTRACE_GETDSPREGS:
	469	return copy_regset_to_user(child, &user_sh_native_view,
	470	REGSET_DSP,
	471	0, sizeof(struct pt_dspregs),
9e1cb206	472	datap);
5dadb343 PM	473	case PTRACE_SETDSPREGS:
	474	return copy_regset_from_user(child, &user_sh_native_view,
	475	REGSET_DSP,
	476	0, sizeof(struct pt_dspregs),
9e1cb206	477	datap);
1da177e4 LT	478	#endif
	479	default:
	480	ret = ptrace_request(child, request, addr, data);
	481	break;
	482	}
481bed45	483
1da177e4 LT	484	return ret;
	485	}
	486
ab99c733	487	asmlinkage long do_syscall_trace_enter(struct pt_regs *regs)
1da177e4	488	{
ab99c733	489	long ret = 0;
1da177e4	490
e4da89d0	491	secure_computing_strict(regs->regs[0]);
c4637d47	492
ab99c733 PM	493	if (test_thread_flag(TIF_SYSCALL_TRACE) &&
	494	tracehook_report_syscall_entry(regs))
	495	/*
	496	* Tracing decided this syscall should not happen.
	497	* We'll return a bogus call number to get an ENOSYS
	498	* error, but leave the original number in regs->regs[0].
	499	*/
	500	ret = -1L;
1322b9de	501
a74f7e04 PM	502	if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
a74f7e04 PM	503	trace_sys_enter(regs, regs->regs[0]);
c652d780	504
91397401	505	audit_syscall_entry(regs->regs[3], regs->regs[4], regs->regs[5],
b05d8447	506	regs->regs[6], regs->regs[7]);
1322b9de	507
ab99c733 PM	508	return ret ?: regs->regs[0];
	509	}
	510
	511	asmlinkage void do_syscall_trace_leave(struct pt_regs *regs)
	512	{
	513	int step;
	514
d7e7528b	515	audit_syscall_exit(regs);
ab99c733	516
a74f7e04 PM	517	if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
a74f7e04 PM	518	trace_sys_exit(regs, regs->regs[0]);
c652d780	519
ab99c733 PM	520	step = test_thread_flag(TIF_SINGLESTEP);
	521	if (step \|\| test_thread_flag(TIF_SYSCALL_TRACE))
	522	tracehook_report_syscall_exit(regs, step);
1da177e4	523	}