[deliverable/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 <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;
		/* 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);

	if (ptrace_get_breakpoints(child) < 0)
		return;

	set_single_step(child, pc);
	ptrace_put_breakpoints(child);
}

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;
}

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
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>
1da177e4 LT	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>
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
34d0b5af PM	66	void ptrace_triggered(struct perf_event *bp, int nmi,
34d0b5af PM	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
34d0b5af PM	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;
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	119
e0ac8457 FW	120	if (ptrace_get_breakpoints(child) < 0)
	121	return;
	122
34d0b5af	123	set_single_step(child, pc);
e0ac8457	124	ptrace_put_breakpoints(child);
c459dbf2 PM	125	}
	126
	127	void user_disable_single_step(struct task_struct *child)
9432f968 SM	128	{
9432f968 SM	129	clear_tsk_thread_flag(child, TIF_SINGLESTEP);
9432f968 SM	130	}
9432f968 SM	131
1da177e4 LT	132	/*
	133	* Called by kernel/ptrace.c when detaching..
	134	*
	135	* Make sure single step bits etc are not set.
	136	*/
	137	void ptrace_disable(struct task_struct *child)
	138	{
c459dbf2	139	user_disable_single_step(child);
1da177e4 LT	140	}
1da177e4 LT	141
934135c1 PM	142	static int genregs_get(struct task_struct *target,
	143	const struct user_regset *regset,
	144	unsigned int pos, unsigned int count,
	145	void kbuf, void __user ubuf)
	146	{
	147	const struct pt_regs *regs = task_pt_regs(target);
	148	int ret;
	149
	150	ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
	151	regs->regs,
	152	0, 16 * sizeof(unsigned long));
	153	if (!ret)
	154	/* PC, PR, SR, GBR, MACH, MACL, TRA */
	155	ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
	156	&regs->pc,
	157	offsetof(struct pt_regs, pc),
	158	sizeof(struct pt_regs));
	159	if (!ret)
	160	ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
	161	sizeof(struct pt_regs), -1);
	162
	163	return ret;
	164	}
	165
	166	static int genregs_set(struct task_struct *target,
	167	const struct user_regset *regset,
	168	unsigned int pos, unsigned int count,
	169	const void kbuf, const void __user ubuf)
	170	{
	171	struct pt_regs *regs = task_pt_regs(target);
	172	int ret;
	173
	174	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
	175	regs->regs,
	176	0, 16 * sizeof(unsigned long));
	177	if (!ret && count > 0)
	178	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
	179	&regs->pc,
	180	offsetof(struct pt_regs, pc),
	181	sizeof(struct pt_regs));
	182	if (!ret)
	183	ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
	184	sizeof(struct pt_regs), -1);
	185
	186	return ret;
	187	}
	188
e7ab3cd2 PM	189	#ifdef CONFIG_SH_FPU
	190	int fpregs_get(struct task_struct *target,
	191	const struct user_regset *regset,
	192	unsigned int pos, unsigned int count,
	193	void kbuf, void __user ubuf)
	194	{
	195	int ret;
	196
	197	ret = init_fpu(target);
	198	if (ret)
	199	return ret;
	200
	201	if ((boot_cpu_data.flags & CPU_HAS_FPU))
	202	return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
0ea820cf	203	&target->thread.xstate->hardfpu, 0, -1);
e7ab3cd2 PM	204
e7ab3cd2 PM	205	return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
0ea820cf	206	&target->thread.xstate->softfpu, 0, -1);
e7ab3cd2 PM	207	}
	208
	209	static int fpregs_set(struct task_struct *target,
	210	const struct user_regset *regset,
	211	unsigned int pos, unsigned int count,
	212	const void kbuf, const void __user ubuf)
	213	{
	214	int ret;
	215
	216	ret = init_fpu(target);
	217	if (ret)
	218	return ret;
	219
	220	set_stopped_child_used_math(target);
	221
	222	if ((boot_cpu_data.flags & CPU_HAS_FPU))
	223	return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
0ea820cf	224	&target->thread.xstate->hardfpu, 0, -1);
e7ab3cd2 PM	225
e7ab3cd2 PM	226	return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
0ea820cf	227	&target->thread.xstate->softfpu, 0, -1);
e7ab3cd2 PM	228	}
	229
	230	static int fpregs_active(struct task_struct *target,
	231	const struct user_regset *regset)
	232	{
	233	return tsk_used_math(target) ? regset->n : 0;
	234	}
	235	#endif
	236
5dadb343 PM	237	#ifdef CONFIG_SH_DSP
	238	static int dspregs_get(struct task_struct *target,
	239	const struct user_regset *regset,
	240	unsigned int pos, unsigned int count,
	241	void kbuf, void __user ubuf)
	242	{
01ab1039 MT	243	const struct pt_dspregs *regs =
01ab1039 MT	244	(struct pt_dspregs *)&target->thread.dsp_status.dsp_regs;
5dadb343 PM	245	int ret;
	246
	247	ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, regs,
	248	0, sizeof(struct pt_dspregs));
	249	if (!ret)
	250	ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
	251	sizeof(struct pt_dspregs), -1);
	252
	253	return ret;
	254	}
	255
	256	static int dspregs_set(struct task_struct *target,
	257	const struct user_regset *regset,
	258	unsigned int pos, unsigned int count,
	259	const void kbuf, const void __user ubuf)
	260	{
01ab1039 MT	261	struct pt_dspregs *regs =
01ab1039 MT	262	(struct pt_dspregs *)&target->thread.dsp_status.dsp_regs;
5dadb343 PM	263	int ret;
	264
	265	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, regs,
	266	0, sizeof(struct pt_dspregs));
	267	if (!ret)
	268	ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
	269	sizeof(struct pt_dspregs), -1);
	270
	271	return ret;
	272	}
72461997 PM	273
	274	static int dspregs_active(struct task_struct *target,
	275	const struct user_regset *regset)
	276	{
	277	struct pt_regs *regs = task_pt_regs(target);
	278
	279	return regs->sr & SR_DSP ? regset->n : 0;
	280	}
5dadb343 PM	281	#endif
5dadb343 PM	282
eaaaeef3 PM	283	const struct pt_regs_offset regoffset_table[] = {
	284	REGS_OFFSET_NAME(0),
	285	REGS_OFFSET_NAME(1),
	286	REGS_OFFSET_NAME(2),
	287	REGS_OFFSET_NAME(3),
	288	REGS_OFFSET_NAME(4),
	289	REGS_OFFSET_NAME(5),
	290	REGS_OFFSET_NAME(6),
	291	REGS_OFFSET_NAME(7),
	292	REGS_OFFSET_NAME(8),
	293	REGS_OFFSET_NAME(9),
	294	REGS_OFFSET_NAME(10),
	295	REGS_OFFSET_NAME(11),
	296	REGS_OFFSET_NAME(12),
	297	REGS_OFFSET_NAME(13),
	298	REGS_OFFSET_NAME(14),
	299	REGS_OFFSET_NAME(15),
	300	REG_OFFSET_NAME(pc),
	301	REG_OFFSET_NAME(pr),
	302	REG_OFFSET_NAME(sr),
	303	REG_OFFSET_NAME(gbr),
	304	REG_OFFSET_NAME(mach),
	305	REG_OFFSET_NAME(macl),
	306	REG_OFFSET_NAME(tra),
	307	REG_OFFSET_END,
	308	};
	309
934135c1 PM	310	/*
	311	* These are our native regset flavours.
	312	*/
	313	enum sh_regset {
	314	REGSET_GENERAL,
e7ab3cd2 PM	315	#ifdef CONFIG_SH_FPU
	316	REGSET_FPU,
	317	#endif
5dadb343 PM	318	#ifdef CONFIG_SH_DSP
	319	REGSET_DSP,
	320	#endif
934135c1 PM	321	};
	322
	323	static const struct user_regset sh_regsets[] = {
	324	/*
	325	* Format is:
	326	* R0 --> R15
	327	* PC, PR, SR, GBR, MACH, MACL, TRA
	328	*/
	329	[REGSET_GENERAL] = {
	330	.core_note_type = NT_PRSTATUS,
	331	.n = ELF_NGREG,
	332	.size = sizeof(long),
	333	.align = sizeof(long),
	334	.get = genregs_get,
	335	.set = genregs_set,
	336	},
5dadb343	337
e7ab3cd2 PM	338	#ifdef CONFIG_SH_FPU
	339	[REGSET_FPU] = {
	340	.core_note_type = NT_PRFPREG,
	341	.n = sizeof(struct user_fpu_struct) / sizeof(long),
	342	.size = sizeof(long),
	343	.align = sizeof(long),
	344	.get = fpregs_get,
	345	.set = fpregs_set,
	346	.active = fpregs_active,
	347	},
	348	#endif
	349
5dadb343 PM	350	#ifdef CONFIG_SH_DSP
	351	[REGSET_DSP] = {
	352	.n = sizeof(struct pt_dspregs) / sizeof(long),
	353	.size = sizeof(long),
	354	.align = sizeof(long),
	355	.get = dspregs_get,
	356	.set = dspregs_set,
72461997	357	.active = dspregs_active,
5dadb343 PM	358	},
5dadb343 PM	359	#endif
934135c1 PM	360	};
	361
	362	static const struct user_regset_view user_sh_native_view = {
	363	.name = "sh",
	364	.e_machine = EM_SH,
	365	.regsets = sh_regsets,
	366	.n = ARRAY_SIZE(sh_regsets),
	367	};
	368
f9540ece PM	369	const struct user_regset_view task_user_regset_view(struct task_struct task)
	370	{
	371	return &user_sh_native_view;
	372	}
	373
9b05a69e NK	374	long arch_ptrace(struct task_struct *child, long request,
9b05a69e NK	375	unsigned long addr, unsigned long data)
1da177e4	376	{
fa43972f	377	unsigned long __user datap = (unsigned long __user )data;
1da177e4 LT	378	int ret;
1da177e4 LT	379
1da177e4	380	switch (request) {
1da177e4 LT	381	/* read the word at location addr in the USER area. */
	382	case PTRACE_PEEKUSR: {
	383	unsigned long tmp;
	384
	385	ret = -EIO;
9432f968	386	if ((addr & 3) \|\| addr < 0 \|\|
1da177e4 LT	387	addr > sizeof(struct user) - 3)
	388	break;
	389
	390	if (addr < sizeof(struct pt_regs))
	391	tmp = get_stack_long(child, addr);
9e1cb206 NK	392	else if (addr >= offsetof(struct user, fpu) &&
9e1cb206 NK	393	addr < offsetof(struct user, u_fpvalid)) {
1da177e4	394	if (!tsk_used_math(child)) {
9e1cb206	395	if (addr == offsetof(struct user, fpu.fpscr))
1da177e4 LT	396	tmp = FPSCR_INIT;
	397	else
	398	tmp = 0;
9e1cb206 NK	399	} else {
9e1cb206 NK	400	unsigned long index;
c49b6ecf PE	401	ret = init_fpu(child);
	402	if (ret)
	403	break;
9e1cb206	404	index = addr - offsetof(struct user, fpu);
9b05a69e	405	tmp = ((unsigned long *)child->thread.xstate)
9e1cb206 NK	406	[index >> 2];
	407	}
	408	} else if (addr == offsetof(struct user, u_fpvalid))
1da177e4	409	tmp = !!tsk_used_math(child);
ba0d4740 PG	410	else if (addr == PT_TEXT_ADDR)
	411	tmp = child->mm->start_code;
	412	else if (addr == PT_DATA_ADDR)
	413	tmp = child->mm->start_data;
	414	else if (addr == PT_TEXT_END_ADDR)
	415	tmp = child->mm->end_code;
	416	else if (addr == PT_TEXT_LEN)
	417	tmp = child->mm->end_code - child->mm->start_code;
1da177e4 LT	418	else
1da177e4 LT	419	tmp = 0;
fa43972f	420	ret = put_user(tmp, datap);
1da177e4 LT	421	break;
	422	}
	423
1da177e4 LT	424	case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
1da177e4 LT	425	ret = -EIO;
9432f968	426	if ((addr & 3) \|\| addr < 0 \|\|
1da177e4 LT	427	addr > sizeof(struct user) - 3)
	428	break;
	429
	430	if (addr < sizeof(struct pt_regs))
	431	ret = put_stack_long(child, addr, data);
9e1cb206 NK	432	else if (addr >= offsetof(struct user, fpu) &&
	433	addr < offsetof(struct user, u_fpvalid)) {
	434	unsigned long index;
c49b6ecf PE	435	ret = init_fpu(child);
	436	if (ret)
	437	break;
9e1cb206	438	index = addr - offsetof(struct user, fpu);
1da177e4	439	set_stopped_child_used_math(child);
9b05a69e	440	((unsigned long *)child->thread.xstate)
9e1cb206	441	[index >> 2] = data;
1da177e4	442	ret = 0;
9e1cb206	443	} else if (addr == offsetof(struct user, u_fpvalid)) {
1da177e4 LT	444	conditional_stopped_child_used_math(data, child);
	445	ret = 0;
	446	}
	447	break;
	448
934135c1 PM	449	case PTRACE_GETREGS:
	450	return copy_regset_to_user(child, &user_sh_native_view,
	451	REGSET_GENERAL,
	452	0, sizeof(struct pt_regs),
9e1cb206	453	datap);
934135c1 PM	454	case PTRACE_SETREGS:
	455	return copy_regset_from_user(child, &user_sh_native_view,
	456	REGSET_GENERAL,
	457	0, sizeof(struct pt_regs),
9e1cb206	458	datap);
e7ab3cd2 PM	459	#ifdef CONFIG_SH_FPU
	460	case PTRACE_GETFPREGS:
	461	return copy_regset_to_user(child, &user_sh_native_view,
	462	REGSET_FPU,
	463	0, sizeof(struct user_fpu_struct),
9e1cb206	464	datap);
e7ab3cd2 PM	465	case PTRACE_SETFPREGS:
	466	return copy_regset_from_user(child, &user_sh_native_view,
	467	REGSET_FPU,
	468	0, sizeof(struct user_fpu_struct),
9e1cb206	469	datap);
e7ab3cd2	470	#endif
1da177e4	471	#ifdef CONFIG_SH_DSP
5dadb343 PM	472	case PTRACE_GETDSPREGS:
	473	return copy_regset_to_user(child, &user_sh_native_view,
	474	REGSET_DSP,
	475	0, sizeof(struct pt_dspregs),
9e1cb206	476	datap);
5dadb343 PM	477	case PTRACE_SETDSPREGS:
	478	return copy_regset_from_user(child, &user_sh_native_view,
	479	REGSET_DSP,
	480	0, sizeof(struct pt_dspregs),
9e1cb206	481	datap);
1da177e4 LT	482	#endif
	483	default:
	484	ret = ptrace_request(child, request, addr, data);
	485	break;
	486	}
481bed45	487
1da177e4 LT	488	return ret;
	489	}
	490
9e5e2117 PM	491	static inline int audit_arch(void)
	492	{
	493	int arch = EM_SH;
	494
	495	#ifdef CONFIG_CPU_LITTLE_ENDIAN
	496	arch \|= __AUDIT_ARCH_LE;
	497	#endif
	498
	499	return arch;
	500	}
	501
ab99c733	502	asmlinkage long do_syscall_trace_enter(struct pt_regs *regs)
1da177e4	503	{
ab99c733	504	long ret = 0;
1da177e4	505
c4637d47 PM	506	secure_computing(regs->regs[0]);
c4637d47 PM	507
ab99c733 PM	508	if (test_thread_flag(TIF_SYSCALL_TRACE) &&
	509	tracehook_report_syscall_entry(regs))
	510	/*
	511	* Tracing decided this syscall should not happen.
	512	* We'll return a bogus call number to get an ENOSYS
	513	* error, but leave the original number in regs->regs[0].
	514	*/
	515	ret = -1L;
1322b9de	516
a74f7e04 PM	517	if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
a74f7e04 PM	518	trace_sys_enter(regs, regs->regs[0]);
c652d780	519
ab99c733	520	if (unlikely(current->audit_context))
9e5e2117	521	audit_syscall_entry(audit_arch(), regs->regs[3],
1322b9de YN	522	regs->regs[4], regs->regs[5],
	523	regs->regs[6], regs->regs[7]);
	524
ab99c733 PM	525	return ret ?: regs->regs[0];
	526	}
	527
	528	asmlinkage void do_syscall_trace_leave(struct pt_regs *regs)
	529	{
	530	int step;
	531
	532	if (unlikely(current->audit_context))
	533	audit_syscall_exit(AUDITSC_RESULT(regs->regs[0]),
	534	regs->regs[0]);
	535
a74f7e04 PM	536	if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
a74f7e04 PM	537	trace_sys_exit(regs, regs->regs[0]);
c652d780	538
ab99c733 PM	539	step = test_thread_flag(TIF_SINGLESTEP);
	540	if (step \|\| test_thread_flag(TIF_SYSCALL_TRACE))
	541	tracehook_report_syscall_exit(regs, step);
1da177e4	542	}