[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,
		      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);

	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
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	120
e0ac8457 FW	121	if (ptrace_get_breakpoints(child) < 0)
	122	return;
	123
34d0b5af	124	set_single_step(child, pc);
e0ac8457	125	ptrace_put_breakpoints(child);
c459dbf2 PM	126	}
	127
	128	void user_disable_single_step(struct task_struct *child)
9432f968 SM	129	{
9432f968 SM	130	clear_tsk_thread_flag(child, TIF_SINGLESTEP);
9432f968 SM	131	}
9432f968 SM	132
1da177e4 LT	133	/*
	134	* Called by kernel/ptrace.c when detaching..
	135	*
	136	* Make sure single step bits etc are not set.
	137	*/
	138	void ptrace_disable(struct task_struct *child)
	139	{
c459dbf2	140	user_disable_single_step(child);
1da177e4 LT	141	}
1da177e4 LT	142
934135c1 PM	143	static int genregs_get(struct task_struct *target,
	144	const struct user_regset *regset,
	145	unsigned int pos, unsigned int count,
	146	void kbuf, void __user ubuf)
	147	{
	148	const struct pt_regs *regs = task_pt_regs(target);
	149	int ret;
	150
	151	ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
	152	regs->regs,
	153	0, 16 * sizeof(unsigned long));
	154	if (!ret)
	155	/* PC, PR, SR, GBR, MACH, MACL, TRA */
	156	ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
	157	&regs->pc,
	158	offsetof(struct pt_regs, pc),
	159	sizeof(struct pt_regs));
	160	if (!ret)
	161	ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
	162	sizeof(struct pt_regs), -1);
	163
	164	return ret;
	165	}
	166
	167	static int genregs_set(struct task_struct *target,
	168	const struct user_regset *regset,
	169	unsigned int pos, unsigned int count,
	170	const void kbuf, const void __user ubuf)
	171	{
	172	struct pt_regs *regs = task_pt_regs(target);
	173	int ret;
	174
	175	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
	176	regs->regs,
	177	0, 16 * sizeof(unsigned long));
	178	if (!ret && count > 0)
	179	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
	180	&regs->pc,
	181	offsetof(struct pt_regs, pc),
	182	sizeof(struct pt_regs));
	183	if (!ret)
	184	ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
	185	sizeof(struct pt_regs), -1);
	186
	187	return ret;
	188	}
	189
e7ab3cd2 PM	190	#ifdef CONFIG_SH_FPU
	191	int fpregs_get(struct task_struct *target,
	192	const struct user_regset *regset,
	193	unsigned int pos, unsigned int count,
	194	void kbuf, void __user ubuf)
	195	{
	196	int ret;
	197
	198	ret = init_fpu(target);
	199	if (ret)
	200	return ret;
	201
	202	if ((boot_cpu_data.flags & CPU_HAS_FPU))
	203	return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
0ea820cf	204	&target->thread.xstate->hardfpu, 0, -1);
e7ab3cd2 PM	205
e7ab3cd2 PM	206	return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
0ea820cf	207	&target->thread.xstate->softfpu, 0, -1);
e7ab3cd2 PM	208	}
	209
	210	static int fpregs_set(struct task_struct *target,
	211	const struct user_regset *regset,
	212	unsigned int pos, unsigned int count,
	213	const void kbuf, const void __user ubuf)
	214	{
	215	int ret;
	216
	217	ret = init_fpu(target);
	218	if (ret)
	219	return ret;
	220
	221	set_stopped_child_used_math(target);
	222
	223	if ((boot_cpu_data.flags & CPU_HAS_FPU))
	224	return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
0ea820cf	225	&target->thread.xstate->hardfpu, 0, -1);
e7ab3cd2 PM	226
e7ab3cd2 PM	227	return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
0ea820cf	228	&target->thread.xstate->softfpu, 0, -1);
e7ab3cd2 PM	229	}
	230
	231	static int fpregs_active(struct task_struct *target,
	232	const struct user_regset *regset)
	233	{
	234	return tsk_used_math(target) ? regset->n : 0;
	235	}
	236	#endif
	237
5dadb343 PM	238	#ifdef CONFIG_SH_DSP
	239	static int dspregs_get(struct task_struct *target,
	240	const struct user_regset *regset,
	241	unsigned int pos, unsigned int count,
	242	void kbuf, void __user ubuf)
	243	{
01ab1039 MT	244	const struct pt_dspregs *regs =
01ab1039 MT	245	(struct pt_dspregs *)&target->thread.dsp_status.dsp_regs;
5dadb343 PM	246	int ret;
	247
	248	ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf, regs,
	249	0, sizeof(struct pt_dspregs));
	250	if (!ret)
	251	ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
	252	sizeof(struct pt_dspregs), -1);
	253
	254	return ret;
	255	}
	256
	257	static int dspregs_set(struct task_struct *target,
	258	const struct user_regset *regset,
	259	unsigned int pos, unsigned int count,
	260	const void kbuf, const void __user ubuf)
	261	{
01ab1039 MT	262	struct pt_dspregs *regs =
01ab1039 MT	263	(struct pt_dspregs *)&target->thread.dsp_status.dsp_regs;
5dadb343 PM	264	int ret;
	265
	266	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, regs,
	267	0, sizeof(struct pt_dspregs));
	268	if (!ret)
	269	ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
	270	sizeof(struct pt_dspregs), -1);
	271
	272	return ret;
	273	}
72461997 PM	274
	275	static int dspregs_active(struct task_struct *target,
	276	const struct user_regset *regset)
	277	{
	278	struct pt_regs *regs = task_pt_regs(target);
	279
	280	return regs->sr & SR_DSP ? regset->n : 0;
	281	}
5dadb343 PM	282	#endif
5dadb343 PM	283
eaaaeef3 PM	284	const struct pt_regs_offset regoffset_table[] = {
	285	REGS_OFFSET_NAME(0),
	286	REGS_OFFSET_NAME(1),
	287	REGS_OFFSET_NAME(2),
	288	REGS_OFFSET_NAME(3),
	289	REGS_OFFSET_NAME(4),
	290	REGS_OFFSET_NAME(5),
	291	REGS_OFFSET_NAME(6),
	292	REGS_OFFSET_NAME(7),
	293	REGS_OFFSET_NAME(8),
	294	REGS_OFFSET_NAME(9),
	295	REGS_OFFSET_NAME(10),
	296	REGS_OFFSET_NAME(11),
	297	REGS_OFFSET_NAME(12),
	298	REGS_OFFSET_NAME(13),
	299	REGS_OFFSET_NAME(14),
	300	REGS_OFFSET_NAME(15),
	301	REG_OFFSET_NAME(pc),
	302	REG_OFFSET_NAME(pr),
	303	REG_OFFSET_NAME(sr),
	304	REG_OFFSET_NAME(gbr),
	305	REG_OFFSET_NAME(mach),
	306	REG_OFFSET_NAME(macl),
	307	REG_OFFSET_NAME(tra),
	308	REG_OFFSET_END,
	309	};
	310
934135c1 PM	311	/*
	312	* These are our native regset flavours.
	313	*/
	314	enum sh_regset {
	315	REGSET_GENERAL,
e7ab3cd2 PM	316	#ifdef CONFIG_SH_FPU
	317	REGSET_FPU,
	318	#endif
5dadb343 PM	319	#ifdef CONFIG_SH_DSP
	320	REGSET_DSP,
	321	#endif
934135c1 PM	322	};
	323
	324	static const struct user_regset sh_regsets[] = {
	325	/*
	326	* Format is:
	327	* R0 --> R15
	328	* PC, PR, SR, GBR, MACH, MACL, TRA
	329	*/
	330	[REGSET_GENERAL] = {
	331	.core_note_type = NT_PRSTATUS,
	332	.n = ELF_NGREG,
	333	.size = sizeof(long),
	334	.align = sizeof(long),
	335	.get = genregs_get,
	336	.set = genregs_set,
	337	},
5dadb343	338
e7ab3cd2 PM	339	#ifdef CONFIG_SH_FPU
	340	[REGSET_FPU] = {
	341	.core_note_type = NT_PRFPREG,
	342	.n = sizeof(struct user_fpu_struct) / sizeof(long),
	343	.size = sizeof(long),
	344	.align = sizeof(long),
	345	.get = fpregs_get,
	346	.set = fpregs_set,
	347	.active = fpregs_active,
	348	},
	349	#endif
	350
5dadb343 PM	351	#ifdef CONFIG_SH_DSP
	352	[REGSET_DSP] = {
	353	.n = sizeof(struct pt_dspregs) / sizeof(long),
	354	.size = sizeof(long),
	355	.align = sizeof(long),
	356	.get = dspregs_get,
	357	.set = dspregs_set,
72461997	358	.active = dspregs_active,
5dadb343 PM	359	},
5dadb343 PM	360	#endif
934135c1 PM	361	};
	362
	363	static const struct user_regset_view user_sh_native_view = {
	364	.name = "sh",
	365	.e_machine = EM_SH,
	366	.regsets = sh_regsets,
	367	.n = ARRAY_SIZE(sh_regsets),
	368	};
	369
f9540ece PM	370	const struct user_regset_view task_user_regset_view(struct task_struct task)
	371	{
	372	return &user_sh_native_view;
	373	}
	374
9b05a69e NK	375	long arch_ptrace(struct task_struct *child, long request,
9b05a69e NK	376	unsigned long addr, unsigned long data)
1da177e4	377	{
fa43972f	378	unsigned long __user datap = (unsigned long __user )data;
1da177e4 LT	379	int ret;
1da177e4 LT	380
1da177e4	381	switch (request) {
1da177e4 LT	382	/* read the word at location addr in the USER area. */
	383	case PTRACE_PEEKUSR: {
	384	unsigned long tmp;
	385
	386	ret = -EIO;
9432f968	387	if ((addr & 3) \|\| addr < 0 \|\|
1da177e4 LT	388	addr > sizeof(struct user) - 3)
	389	break;
	390
	391	if (addr < sizeof(struct pt_regs))
	392	tmp = get_stack_long(child, addr);
9e1cb206 NK	393	else if (addr >= offsetof(struct user, fpu) &&
9e1cb206 NK	394	addr < offsetof(struct user, u_fpvalid)) {
1da177e4	395	if (!tsk_used_math(child)) {
9e1cb206	396	if (addr == offsetof(struct user, fpu.fpscr))
1da177e4 LT	397	tmp = FPSCR_INIT;
	398	else
	399	tmp = 0;
9e1cb206 NK	400	} else {
9e1cb206 NK	401	unsigned long index;
c49b6ecf PE	402	ret = init_fpu(child);
	403	if (ret)
	404	break;
9e1cb206	405	index = addr - offsetof(struct user, fpu);
9b05a69e	406	tmp = ((unsigned long *)child->thread.xstate)
9e1cb206 NK	407	[index >> 2];
	408	}
	409	} else if (addr == offsetof(struct user, u_fpvalid))
1da177e4	410	tmp = !!tsk_used_math(child);
ba0d4740 PG	411	else if (addr == PT_TEXT_ADDR)
	412	tmp = child->mm->start_code;
	413	else if (addr == PT_DATA_ADDR)
	414	tmp = child->mm->start_data;
	415	else if (addr == PT_TEXT_END_ADDR)
	416	tmp = child->mm->end_code;
	417	else if (addr == PT_TEXT_LEN)
	418	tmp = child->mm->end_code - child->mm->start_code;
1da177e4 LT	419	else
1da177e4 LT	420	tmp = 0;
fa43972f	421	ret = put_user(tmp, datap);
1da177e4 LT	422	break;
	423	}
	424
1da177e4 LT	425	case PTRACE_POKEUSR: /* write the word at location addr in the USER area */
1da177e4 LT	426	ret = -EIO;
9432f968	427	if ((addr & 3) \|\| addr < 0 \|\|
1da177e4 LT	428	addr > sizeof(struct user) - 3)
	429	break;
	430
	431	if (addr < sizeof(struct pt_regs))
	432	ret = put_stack_long(child, addr, data);
9e1cb206 NK	433	else if (addr >= offsetof(struct user, fpu) &&
	434	addr < offsetof(struct user, u_fpvalid)) {
	435	unsigned long index;
c49b6ecf PE	436	ret = init_fpu(child);
	437	if (ret)
	438	break;
9e1cb206	439	index = addr - offsetof(struct user, fpu);
1da177e4	440	set_stopped_child_used_math(child);
9b05a69e	441	((unsigned long *)child->thread.xstate)
9e1cb206	442	[index >> 2] = data;
1da177e4	443	ret = 0;
9e1cb206	444	} else if (addr == offsetof(struct user, u_fpvalid)) {
1da177e4 LT	445	conditional_stopped_child_used_math(data, child);
	446	ret = 0;
	447	}
	448	break;
	449
934135c1 PM	450	case PTRACE_GETREGS:
	451	return copy_regset_to_user(child, &user_sh_native_view,
	452	REGSET_GENERAL,
	453	0, sizeof(struct pt_regs),
9e1cb206	454	datap);
934135c1 PM	455	case PTRACE_SETREGS:
	456	return copy_regset_from_user(child, &user_sh_native_view,
	457	REGSET_GENERAL,
	458	0, sizeof(struct pt_regs),
9e1cb206	459	datap);
e7ab3cd2 PM	460	#ifdef CONFIG_SH_FPU
	461	case PTRACE_GETFPREGS:
	462	return copy_regset_to_user(child, &user_sh_native_view,
	463	REGSET_FPU,
	464	0, sizeof(struct user_fpu_struct),
9e1cb206	465	datap);
e7ab3cd2 PM	466	case PTRACE_SETFPREGS:
	467	return copy_regset_from_user(child, &user_sh_native_view,
	468	REGSET_FPU,
	469	0, sizeof(struct user_fpu_struct),
9e1cb206	470	datap);
e7ab3cd2	471	#endif
1da177e4	472	#ifdef CONFIG_SH_DSP
5dadb343 PM	473	case PTRACE_GETDSPREGS:
	474	return copy_regset_to_user(child, &user_sh_native_view,
	475	REGSET_DSP,
	476	0, sizeof(struct pt_dspregs),
9e1cb206	477	datap);
5dadb343 PM	478	case PTRACE_SETDSPREGS:
	479	return copy_regset_from_user(child, &user_sh_native_view,
	480	REGSET_DSP,
	481	0, sizeof(struct pt_dspregs),
9e1cb206	482	datap);
1da177e4 LT	483	#endif
	484	default:
	485	ret = ptrace_request(child, request, addr, data);
	486	break;
	487	}
481bed45	488
1da177e4 LT	489	return ret;
	490	}
	491
9e5e2117 PM	492	static inline int audit_arch(void)
	493	{
	494	int arch = EM_SH;
	495
	496	#ifdef CONFIG_CPU_LITTLE_ENDIAN
	497	arch \|= __AUDIT_ARCH_LE;
	498	#endif
	499
	500	return arch;
	501	}
	502
ab99c733	503	asmlinkage long do_syscall_trace_enter(struct pt_regs *regs)
1da177e4	504	{
ab99c733	505	long ret = 0;
1da177e4	506
c4637d47 PM	507	secure_computing(regs->regs[0]);
c4637d47 PM	508
ab99c733 PM	509	if (test_thread_flag(TIF_SYSCALL_TRACE) &&
	510	tracehook_report_syscall_entry(regs))
	511	/*
	512	* Tracing decided this syscall should not happen.
	513	* We'll return a bogus call number to get an ENOSYS
	514	* error, but leave the original number in regs->regs[0].
	515	*/
	516	ret = -1L;
1322b9de	517
a74f7e04 PM	518	if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
a74f7e04 PM	519	trace_sys_enter(regs, regs->regs[0]);
c652d780	520
ab99c733	521	if (unlikely(current->audit_context))
9e5e2117	522	audit_syscall_entry(audit_arch(), regs->regs[3],
1322b9de YN	523	regs->regs[4], regs->regs[5],
	524	regs->regs[6], regs->regs[7]);
	525
ab99c733 PM	526	return ret ?: regs->regs[0];
	527	}
	528
	529	asmlinkage void do_syscall_trace_leave(struct pt_regs *regs)
	530	{
	531	int step;
	532
	533	if (unlikely(current->audit_context))
	534	audit_syscall_exit(AUDITSC_RESULT(regs->regs[0]),
	535	regs->regs[0]);
	536
a74f7e04 PM	537	if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
a74f7e04 PM	538	trace_sys_exit(regs, regs->regs[0]);
c652d780	539
ab99c733 PM	540	step = test_thread_flag(TIF_SINGLESTEP);
	541	if (step \|\| test_thread_flag(TIF_SYSCALL_TRACE))
	542	tracehook_report_syscall_exit(regs, step);
1da177e4	543	}