[mirror_ubuntu-bionic-kernel.git] / arch / sh / kernel / ptrace_64.c

/*
 * arch/sh/kernel/ptrace_64.c
 *
 * Copyright (C) 2000, 2001  Paolo Alberelli
 * Copyright (C) 2003 - 2008  Paul Mundt
 *
 * Started from SH3/4 version:
 *   SuperH version:   Copyright (C) 1999, 2000  Kaz Kojima & Niibe Yutaka
 *
 *   Original x86 implementation:
 *	By Ross Biro 1/23/92
 *	edited by Linus Torvalds
 *
 * 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/rwsem.h>
#include <linux/sched.h>
#include <linux/sched/task_stack.h>
#include <linux/mm.h>
#include <linux/smp.h>
#include <linux/bitops.h>
#include <linux/errno.h>
#include <linux/ptrace.h>
#include <linux/user.h>
#include <linux/signal.h>
#include <linux/syscalls.h>
#include <linux/audit.h>
#include <linux/seccomp.h>
#include <linux/tracehook.h>
#include <linux/elf.h>
#include <linux/regset.h>
#include <asm/io.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>
#include <asm/traps.h>

#define CREATE_TRACE_POINTS
#include <trace/events/syscalls.h>

/* This mask defines the bits of the SR which the user is not allowed to
   change, which are everything except S, Q, M, PR, SZ, FR. */
#define SR_MASK      (0xffff8cfd)

/*
 * does not yet catch signals sent when the child dies.
 * in exit.c or in signal.c.
 */

/*
 * This routine will get a word from the user area in the process kernel stack.
 */
static inline int get_stack_long(struct task_struct *task, int offset)
{
	unsigned char *stack;

	stack = (unsigned char *)(task->thread.uregs);
	stack += offset;
	return (*((int *)stack));
}

static inline unsigned long
get_fpu_long(struct task_struct *task, unsigned long addr)
{
	unsigned long tmp;
	struct pt_regs *regs;
	regs = (struct pt_regs*)((unsigned char *)task + THREAD_SIZE) - 1;

	if (!tsk_used_math(task)) {
		if (addr == offsetof(struct user_fpu_struct, fpscr)) {
			tmp = FPSCR_INIT;
		} else {
			tmp = 0xffffffffUL; /* matches initial value in fpu.c */
		}
		return tmp;
	}

	if (last_task_used_math == task) {
		enable_fpu();
		save_fpu(task);
		disable_fpu();
		last_task_used_math = 0;
		regs->sr |= SR_FD;
	}

	tmp = ((long *)task->thread.xstate)[addr / sizeof(unsigned long)];
	return tmp;
}

/*
 * This routine will put a word into the user area in 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->thread.uregs);
	stack += offset;
	*(unsigned long *) stack = data;
	return 0;
}

static inline int
put_fpu_long(struct task_struct *task, unsigned long addr, unsigned long data)
{
	struct pt_regs *regs;

	regs = (struct pt_regs*)((unsigned char *)task + THREAD_SIZE) - 1;

	if (!tsk_used_math(task)) {
		init_fpu(task);
	} else if (last_task_used_math == task) {
		enable_fpu();
		save_fpu(task);
		disable_fpu();
		last_task_used_math = 0;
		regs->sr |= SR_FD;
	}

	((long *)task->thread.xstate)[addr / sizeof(unsigned long)] = data;
	return 0;
}

void user_enable_single_step(struct task_struct *child)
{
	struct pt_regs *regs = child->thread.uregs;

	regs->sr |= SR_SSTEP;	/* auto-resetting upon exception */

	set_tsk_thread_flag(child, TIF_SINGLESTEP);
}

void user_disable_single_step(struct task_struct *child)
{
	struct pt_regs *regs = child->thread.uregs;

	regs->sr &= ~SR_SSTEP;

	clear_tsk_thread_flag(child, TIF_SINGLESTEP);
}

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;

	/* PC, SR, SYSCALL */
	ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
				  &regs->pc,
				  0, 3 * sizeof(unsigned long long));

	/* R1 -> R63 */
	if (!ret)
		ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
					  regs->regs,
					  offsetof(struct pt_regs, regs[0]),
					  63 * sizeof(unsigned long long));
	/* TR0 -> TR7 */
	if (!ret)
		ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
					  regs->tregs,
					  offsetof(struct pt_regs, tregs[0]),
					  8 * sizeof(unsigned long long));

	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;

	/* PC, SR, SYSCALL */
	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
				 &regs->pc,
				 0, 3 * sizeof(unsigned long long));

	/* R1 -> R63 */
	if (!ret && count > 0)
		ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
					 regs->regs,
					 offsetof(struct pt_regs, regs[0]),
					 63 * sizeof(unsigned long long));

	/* TR0 -> TR7 */
	if (!ret && count > 0)
		ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
					 regs->tregs,
					 offsetof(struct pt_regs, tregs[0]),
					 8 * sizeof(unsigned long long));

	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;

	return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
				   &target->thread.xstate->hardfpu, 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);

	return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
				  &target->thread.xstate->hardfpu, 0, -1);
}

static int fpregs_active(struct task_struct *target,
			 const struct user_regset *regset)
{
	return tsk_used_math(target) ? regset->n : 0;
}
#endif

const struct pt_regs_offset regoffset_table[] = {
	REG_OFFSET_NAME(pc),
	REG_OFFSET_NAME(sr),
	REG_OFFSET_NAME(syscall_nr),
	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),
	REGS_OFFSET_NAME(16),
	REGS_OFFSET_NAME(17),
	REGS_OFFSET_NAME(18),
	REGS_OFFSET_NAME(19),
	REGS_OFFSET_NAME(20),
	REGS_OFFSET_NAME(21),
	REGS_OFFSET_NAME(22),
	REGS_OFFSET_NAME(23),
	REGS_OFFSET_NAME(24),
	REGS_OFFSET_NAME(25),
	REGS_OFFSET_NAME(26),
	REGS_OFFSET_NAME(27),
	REGS_OFFSET_NAME(28),
	REGS_OFFSET_NAME(29),
	REGS_OFFSET_NAME(30),
	REGS_OFFSET_NAME(31),
	REGS_OFFSET_NAME(32),
	REGS_OFFSET_NAME(33),
	REGS_OFFSET_NAME(34),
	REGS_OFFSET_NAME(35),
	REGS_OFFSET_NAME(36),
	REGS_OFFSET_NAME(37),
	REGS_OFFSET_NAME(38),
	REGS_OFFSET_NAME(39),
	REGS_OFFSET_NAME(40),
	REGS_OFFSET_NAME(41),
	REGS_OFFSET_NAME(42),
	REGS_OFFSET_NAME(43),
	REGS_OFFSET_NAME(44),
	REGS_OFFSET_NAME(45),
	REGS_OFFSET_NAME(46),
	REGS_OFFSET_NAME(47),
	REGS_OFFSET_NAME(48),
	REGS_OFFSET_NAME(49),
	REGS_OFFSET_NAME(50),
	REGS_OFFSET_NAME(51),
	REGS_OFFSET_NAME(52),
	REGS_OFFSET_NAME(53),
	REGS_OFFSET_NAME(54),
	REGS_OFFSET_NAME(55),
	REGS_OFFSET_NAME(56),
	REGS_OFFSET_NAME(57),
	REGS_OFFSET_NAME(58),
	REGS_OFFSET_NAME(59),
	REGS_OFFSET_NAME(60),
	REGS_OFFSET_NAME(61),
	REGS_OFFSET_NAME(62),
	REGS_OFFSET_NAME(63),
	TREGS_OFFSET_NAME(0),
	TREGS_OFFSET_NAME(1),
	TREGS_OFFSET_NAME(2),
	TREGS_OFFSET_NAME(3),
	TREGS_OFFSET_NAME(4),
	TREGS_OFFSET_NAME(5),
	TREGS_OFFSET_NAME(6),
	TREGS_OFFSET_NAME(7),
	REG_OFFSET_END,
};

/*
 * These are our native regset flavours.
 */
enum sh_regset {
	REGSET_GENERAL,
#ifdef CONFIG_SH_FPU
	REGSET_FPU,
#endif
};

static const struct user_regset sh_regsets[] = {
	/*
	 * Format is:
	 *	PC, SR, SYSCALL,
	 *	R1 --> R63,
	 *	TR0 --> TR7,
	 */
	[REGSET_GENERAL] = {
		.core_note_type	= NT_PRSTATUS,
		.n		= ELF_NGREG,
		.size		= sizeof(long long),
		.align		= sizeof(long 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 long),
		.size		= sizeof(long long),
		.align		= sizeof(long long),
		.get		= fpregs_get,
		.set		= fpregs_set,
		.active		= fpregs_active,
	},
#endif
};

static const struct user_regset_view user_sh64_native_view = {
	.name		= "sh64",
	.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_sh64_native_view;
}

long arch_ptrace(struct task_struct *child, long request,
		 unsigned long addr, unsigned long data)
{
	int ret;
	unsigned long __user *datap = (unsigned long __user *) data;

	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)
			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))) {
			unsigned long index;
			ret = init_fpu(child);
			if (ret)
				break;
			index = addr - offsetof(struct user, fpu);
			tmp = get_fpu_long(child, index);
		} else if (addr == offsetof(struct user, u_fpvalid)) {
			tmp = !!tsk_used_math(child);
		} else {
			break;
		}
		ret = put_user(tmp, datap);
		break;
	}

	case PTRACE_POKEUSR:
                /* write the word at location addr in the USER area. We must
                   disallow any changes to certain SR bits or u_fpvalid, since
                   this could crash the kernel or result in a security
                   loophole. */
		ret = -EIO;
		if ((addr & 3) || addr < 0)
			break;

		if (addr < sizeof(struct pt_regs)) {
			/* Ignore change of top 32 bits of SR */
			if (addr == offsetof (struct pt_regs, sr)+4)
			{
				ret = 0;
				break;
			}
			/* If lower 32 bits of SR, ignore non-user bits */
			if (addr == offsetof (struct pt_regs, sr))
			{
				long cursr = get_stack_long(child, addr);
				data &= ~(SR_MASK);
				data |= (cursr & SR_MASK);
			}
			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);
			ret = put_fpu_long(child, index, data);
		}
		break;

	case PTRACE_GETREGS:
		return copy_regset_to_user(child, &user_sh64_native_view,
					   REGSET_GENERAL,
					   0, sizeof(struct pt_regs),
					   datap);
	case PTRACE_SETREGS:
		return copy_regset_from_user(child, &user_sh64_native_view,
					     REGSET_GENERAL,
					     0, sizeof(struct pt_regs),
					     datap);
#ifdef CONFIG_SH_FPU
	case PTRACE_GETFPREGS:
		return copy_regset_to_user(child, &user_sh64_native_view,
					   REGSET_FPU,
					   0, sizeof(struct user_fpu_struct),
					   datap);
	case PTRACE_SETFPREGS:
		return copy_regset_from_user(child, &user_sh64_native_view,
					     REGSET_FPU,
					     0, sizeof(struct user_fpu_struct),
					     datap);
#endif
	default:
		ret = ptrace_request(child, request, addr, data);
		break;
	}

	return ret;
}

asmlinkage int sh64_ptrace(long request, long pid,
			   unsigned long addr, unsigned long data)
{
#define WPC_DBRMODE 0x0d104008
	static unsigned long first_call;

	if (!test_and_set_bit(0, &first_call)) {
		/* Set WPC.DBRMODE to 0.  This makes all debug events get
		 * delivered through RESVEC, i.e. into the handlers in entry.S.
		 * (If the kernel was downloaded using a remote gdb, WPC.DBRMODE
		 * would normally be left set to 1, which makes debug events get
		 * delivered through DBRVEC, i.e. into the remote gdb's
		 * handlers.  This prevents ptrace getting them, and confuses
		 * the remote gdb.) */
		printk("DBRMODE set to 0 to permit native debugging\n");
		poke_real_address_q(WPC_DBRMODE, 0);
	}

	return sys_ptrace(request, pid, addr, data);
}

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

	secure_computing_strict(regs->regs[9]);

	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 = -1LL;

	if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
		trace_sys_enter(regs, regs->regs[9]);

	audit_syscall_entry(regs->regs[1], regs->regs[2], regs->regs[3],
			    regs->regs[4], regs->regs[5]);

	return ret ?: regs->regs[9];
}

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[9]);

	step = test_thread_flag(TIF_SINGLESTEP);
	if (step || test_thread_flag(TIF_SYSCALL_TRACE))
		tracehook_report_syscall_exit(regs, step);
}

/* Called with interrupts disabled */
asmlinkage void do_single_step(unsigned long long vec, struct pt_regs *regs)
{
	/* This is called after a single step exception (DEBUGSS).
	   There is no need to change the PC, as it is a post-execution
	   exception, as entry.S does not do anything to the PC for DEBUGSS.
	   We need to clear the Single Step setting in SR to avoid
	   continually stepping. */
	local_irq_enable();
	regs->sr &= ~SR_SSTEP;
	force_sig(SIGTRAP, current);
}

/* Called with interrupts disabled */
BUILD_TRAP_HANDLER(breakpoint)
{
	TRAP_HANDLER_DECL;

	/* We need to forward step the PC, to counteract the backstep done
	   in signal.c. */
	local_irq_enable();
	force_sig(SIGTRAP, current);
	regs->pc += 4;
}

/*
 * 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);
}
Commit	Line	Data
1da177e4	1	/*
4b27c47c	2	* arch/sh/kernel/ptrace_64.c
1da177e4 LT	3	*
1da177e4 LT	4	* Copyright (C) 2000, 2001 Paolo Alberelli
dd76279b	5	* Copyright (C) 2003 - 2008 Paul Mundt
1da177e4 LT	6	*
	7	* Started from SH3/4 version:
	8	* SuperH version: Copyright (C) 1999, 2000 Kaz Kojima & Niibe Yutaka
	9	*
	10	* Original x86 implementation:
	11	* By Ross Biro 1/23/92
	12	* edited by Linus Torvalds
	13	*
4b27c47c PM	14	* This file is subject to the terms and conditions of the GNU General Public
	15	* License. See the file "COPYING" in the main directory of this archive
	16	* for more details.
1da177e4	17	*/
1da177e4 LT	18	#include <linux/kernel.h>
	19	#include <linux/rwsem.h>
	20	#include <linux/sched.h>
68db0cf1	21	#include <linux/sched/task_stack.h>
1da177e4 LT	22	#include <linux/mm.h>
1da177e4 LT	23	#include <linux/smp.h>
d71415e8	24	#include <linux/bitops.h>
1da177e4 LT	25	#include <linux/errno.h>
	26	#include <linux/ptrace.h>
	27	#include <linux/user.h>
7ed20e1a	28	#include <linux/signal.h>
481bed45	29	#include <linux/syscalls.h>
4b27c47c	30	#include <linux/audit.h>
c4637d47	31	#include <linux/seccomp.h>
ab99c733	32	#include <linux/tracehook.h>
dd76279b PM	33	#include <linux/elf.h>
dd76279b PM	34	#include <linux/regset.h>
1da177e4	35	#include <asm/io.h>
7c0f6ba6	36	#include <linux/uaccess.h>
1da177e4	37	#include <asm/pgtable.h>
1da177e4 LT	38	#include <asm/processor.h>
1da177e4 LT	39	#include <asm/mmu_context.h>
fa43972f	40	#include <asm/syscalls.h>
50387b3e	41	#include <asm/fpu.h>
e839ca52	42	#include <asm/traps.h>
1da177e4	43
a74f7e04 PM	44	#define CREATE_TRACE_POINTS
	45	#include <trace/events/syscalls.h>
	46
1da177e4 LT	47	/* This mask defines the bits of the SR which the user is not allowed to
	48	change, which are everything except S, Q, M, PR, SZ, FR. */
	49	#define SR_MASK (0xffff8cfd)
	50
	51	/*
	52	* does not yet catch signals sent when the child dies.
	53	* in exit.c or in signal.c.
	54	*/
	55
	56	/*
	57	* This routine will get a word from the user area in the process kernel stack.
	58	*/
	59	static inline int get_stack_long(struct task_struct *task, int offset)
	60	{
	61	unsigned char *stack;
	62
	63	stack = (unsigned char *)(task->thread.uregs);
	64	stack += offset;
	65	return (((int )stack));
	66	}
	67
	68	static inline unsigned long
	69	get_fpu_long(struct task_struct *task, unsigned long addr)
	70	{
	71	unsigned long tmp;
	72	struct pt_regs *regs;
	73	regs = (struct pt_regs)((unsigned char )task + THREAD_SIZE) - 1;
	74
	75	if (!tsk_used_math(task)) {
	76	if (addr == offsetof(struct user_fpu_struct, fpscr)) {
	77	tmp = FPSCR_INIT;
	78	} else {
	79	tmp = 0xffffffffUL; /* matches initial value in fpu.c */
	80	}
	81	return tmp;
	82	}
	83
	84	if (last_task_used_math == task) {
256b22ca	85	enable_fpu();
61cc7b0a	86	save_fpu(task);
256b22ca	87	disable_fpu();
1da177e4 LT	88	last_task_used_math = 0;
	89	regs->sr \|= SR_FD;
	90	}
	91
3ef2932b	92	tmp = ((long *)task->thread.xstate)[addr / sizeof(unsigned long)];
1da177e4 LT	93	return tmp;
	94	}
	95
	96	/*
	97	* This routine will put a word into the user area in the process kernel stack.
	98	*/
	99	static inline int put_stack_long(struct task_struct *task, int offset,
	100	unsigned long data)
	101	{
	102	unsigned char *stack;
	103
	104	stack = (unsigned char *)(task->thread.uregs);
	105	stack += offset;
	106	(unsigned long ) stack = data;
	107	return 0;
	108	}
	109
	110	static inline int
	111	put_fpu_long(struct task_struct *task, unsigned long addr, unsigned long data)
	112	{
	113	struct pt_regs *regs;
	114
	115	regs = (struct pt_regs)((unsigned char )task + THREAD_SIZE) - 1;
	116
	117	if (!tsk_used_math(task)) {
d6db8888	118	init_fpu(task);
1da177e4	119	} else if (last_task_used_math == task) {
256b22ca	120	enable_fpu();
61cc7b0a	121	save_fpu(task);
256b22ca	122	disable_fpu();
1da177e4 LT	123	last_task_used_math = 0;
	124	regs->sr \|= SR_FD;
	125	}
	126
3ef2932b	127	((long *)task->thread.xstate)[addr / sizeof(unsigned long)] = data;
1da177e4 LT	128	return 0;
	129	}
	130
c459dbf2 PM	131	void user_enable_single_step(struct task_struct *child)
	132	{
	133	struct pt_regs *regs = child->thread.uregs;
	134
	135	regs->sr \|= SR_SSTEP; /* auto-resetting upon exception */
4b505db9 PM	136
4b505db9 PM	137	set_tsk_thread_flag(child, TIF_SINGLESTEP);
c459dbf2 PM	138	}
	139
	140	void user_disable_single_step(struct task_struct *child)
	141	{
e311be52 AB	142	struct pt_regs *regs = child->thread.uregs;
e311be52 AB	143
c459dbf2	144	regs->sr &= ~SR_SSTEP;
4b505db9 PM	145
4b505db9 PM	146	clear_tsk_thread_flag(child, TIF_SINGLESTEP);
c459dbf2	147	}
481bed45	148
dd76279b PM	149	static int genregs_get(struct task_struct *target,
	150	const struct user_regset *regset,
	151	unsigned int pos, unsigned int count,
	152	void kbuf, void __user ubuf)
	153	{
	154	const struct pt_regs *regs = task_pt_regs(target);
	155	int ret;
	156
	157	/* PC, SR, SYSCALL */
	158	ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
	159	&regs->pc,
	160	0, 3 * sizeof(unsigned long long));
	161
	162	/* R1 -> R63 */
	163	if (!ret)
	164	ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
	165	regs->regs,
	166	offsetof(struct pt_regs, regs[0]),
	167	63 * sizeof(unsigned long long));
	168	/* TR0 -> TR7 */
	169	if (!ret)
	170	ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
	171	regs->tregs,
	172	offsetof(struct pt_regs, tregs[0]),
	173	8 * sizeof(unsigned long long));
	174
	175	if (!ret)
	176	ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
	177	sizeof(struct pt_regs), -1);
	178
	179	return ret;
	180	}
	181
	182	static int genregs_set(struct task_struct *target,
	183	const struct user_regset *regset,
	184	unsigned int pos, unsigned int count,
	185	const void kbuf, const void __user ubuf)
	186	{
	187	struct pt_regs *regs = task_pt_regs(target);
	188	int ret;
	189
	190	/* PC, SR, SYSCALL */
	191	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
	192	&regs->pc,
	193	0, 3 * sizeof(unsigned long long));
	194
	195	/* R1 -> R63 */
	196	if (!ret && count > 0)
	197	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
	198	regs->regs,
	199	offsetof(struct pt_regs, regs[0]),
	200	63 * sizeof(unsigned long long));
	201
	202	/* TR0 -> TR7 */
	203	if (!ret && count > 0)
	204	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
	205	regs->tregs,
	206	offsetof(struct pt_regs, tregs[0]),
	207	8 * sizeof(unsigned long long));
	208
	209	if (!ret)
	210	ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
	211	sizeof(struct pt_regs), -1);
	212
213	return ret;
214	}
215
216	#ifdef CONFIG_SH_FPU
217	int fpregs_get(struct task_struct *target,
218	const struct user_regset *regset,
219	unsigned int pos, unsigned int count,
220	void kbuf, void __user ubuf)
221	{
222	int ret;
223
224	ret = init_fpu(target);
225	if (ret)
226	return ret;
227
228	return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
3ef2932b	229	&target->thread.xstate->hardfpu, 0, -1);
dd76279b PM	230	}
	231
	232	static int fpregs_set(struct task_struct *target,
	233	const struct user_regset *regset,
	234	unsigned int pos, unsigned int count,
	235	const void kbuf, const void __user ubuf)
	236	{
	237	int ret;
	238
	239	ret = init_fpu(target);
	240	if (ret)
	241	return ret;
	242
	243	set_stopped_child_used_math(target);
	244
	245	return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
3ef2932b	246	&target->thread.xstate->hardfpu, 0, -1);
dd76279b PM	247	}
	248
	249	static int fpregs_active(struct task_struct *target,
	250	const struct user_regset *regset)
	251	{
	252	return tsk_used_math(target) ? regset->n : 0;
	253	}
	254	#endif
	255
eaaaeef3 PM	256	const struct pt_regs_offset regoffset_table[] = {
	257	REG_OFFSET_NAME(pc),
	258	REG_OFFSET_NAME(sr),
	259	REG_OFFSET_NAME(syscall_nr),
	260	REGS_OFFSET_NAME(0),
	261	REGS_OFFSET_NAME(1),
	262	REGS_OFFSET_NAME(2),
	263	REGS_OFFSET_NAME(3),
	264	REGS_OFFSET_NAME(4),
	265	REGS_OFFSET_NAME(5),
	266	REGS_OFFSET_NAME(6),
	267	REGS_OFFSET_NAME(7),
	268	REGS_OFFSET_NAME(8),
	269	REGS_OFFSET_NAME(9),
	270	REGS_OFFSET_NAME(10),
	271	REGS_OFFSET_NAME(11),
	272	REGS_OFFSET_NAME(12),
	273	REGS_OFFSET_NAME(13),
	274	REGS_OFFSET_NAME(14),
	275	REGS_OFFSET_NAME(15),
	276	REGS_OFFSET_NAME(16),
	277	REGS_OFFSET_NAME(17),
	278	REGS_OFFSET_NAME(18),
	279	REGS_OFFSET_NAME(19),
	280	REGS_OFFSET_NAME(20),
	281	REGS_OFFSET_NAME(21),
	282	REGS_OFFSET_NAME(22),
	283	REGS_OFFSET_NAME(23),
	284	REGS_OFFSET_NAME(24),
	285	REGS_OFFSET_NAME(25),
	286	REGS_OFFSET_NAME(26),
	287	REGS_OFFSET_NAME(27),
	288	REGS_OFFSET_NAME(28),
	289	REGS_OFFSET_NAME(29),
	290	REGS_OFFSET_NAME(30),
	291	REGS_OFFSET_NAME(31),
	292	REGS_OFFSET_NAME(32),
	293	REGS_OFFSET_NAME(33),
	294	REGS_OFFSET_NAME(34),
	295	REGS_OFFSET_NAME(35),
	296	REGS_OFFSET_NAME(36),
	297	REGS_OFFSET_NAME(37),
	298	REGS_OFFSET_NAME(38),
	299	REGS_OFFSET_NAME(39),
	300	REGS_OFFSET_NAME(40),
	301	REGS_OFFSET_NAME(41),
	302	REGS_OFFSET_NAME(42),
	303	REGS_OFFSET_NAME(43),
	304	REGS_OFFSET_NAME(44),
	305	REGS_OFFSET_NAME(45),
	306	REGS_OFFSET_NAME(46),
	307	REGS_OFFSET_NAME(47),
	308	REGS_OFFSET_NAME(48),
	309	REGS_OFFSET_NAME(49),
	310	REGS_OFFSET_NAME(50),
	311	REGS_OFFSET_NAME(51),
	312	REGS_OFFSET_NAME(52),
	313	REGS_OFFSET_NAME(53),
	314	REGS_OFFSET_NAME(54),
	315	REGS_OFFSET_NAME(55),
	316	REGS_OFFSET_NAME(56),
	317	REGS_OFFSET_NAME(57),
	318	REGS_OFFSET_NAME(58),
	319	REGS_OFFSET_NAME(59),
320	REGS_OFFSET_NAME(60),
321	REGS_OFFSET_NAME(61),
322	REGS_OFFSET_NAME(62),
323	REGS_OFFSET_NAME(63),
324	TREGS_OFFSET_NAME(0),
325	TREGS_OFFSET_NAME(1),
326	TREGS_OFFSET_NAME(2),
327	TREGS_OFFSET_NAME(3),
328	TREGS_OFFSET_NAME(4),
329	TREGS_OFFSET_NAME(5),
330	TREGS_OFFSET_NAME(6),
331	TREGS_OFFSET_NAME(7),
332	REG_OFFSET_END,
333	};
334
dd76279b PM	335	/*
	336	* These are our native regset flavours.
	337	*/
	338	enum sh_regset {
	339	REGSET_GENERAL,
	340	#ifdef CONFIG_SH_FPU
	341	REGSET_FPU,
	342	#endif
	343	};
	344
	345	static const struct user_regset sh_regsets[] = {
	346	/*
	347	* Format is:
	348	* PC, SR, SYSCALL,
	349	* R1 --> R63,
	350	* TR0 --> TR7,
	351	*/
	352	[REGSET_GENERAL] = {
	353	.core_note_type = NT_PRSTATUS,
	354	.n = ELF_NGREG,
	355	.size = sizeof(long long),
	356	.align = sizeof(long long),
	357	.get = genregs_get,
	358	.set = genregs_set,
	359	},
	360
	361	#ifdef CONFIG_SH_FPU
	362	[REGSET_FPU] = {
	363	.core_note_type = NT_PRFPREG,
	364	.n = sizeof(struct user_fpu_struct) /
	365	sizeof(long long),
	366	.size = sizeof(long long),
	367	.align = sizeof(long long),
	368	.get = fpregs_get,
	369	.set = fpregs_set,
	370	.active = fpregs_active,
	371	},
	372	#endif
	373	};
	374
	375	static const struct user_regset_view user_sh64_native_view = {
	376	.name = "sh64",
	377	.e_machine = EM_SH,
	378	.regsets = sh_regsets,
	379	.n = ARRAY_SIZE(sh_regsets),
	380	};
	381
	382	const struct user_regset_view task_user_regset_view(struct task_struct task)
	383	{
	384	return &user_sh64_native_view;
	385	}
	386
9b05a69e NK	387	long arch_ptrace(struct task_struct *child, long request,
9b05a69e NK	388	unsigned long addr, unsigned long data)
1da177e4	389	{
1da177e4	390	int ret;
9e1cb206	391	unsigned long __user datap = (unsigned long __user ) data;
1da177e4	392
1da177e4	393	switch (request) {
1da177e4 LT	394	/* read the word at location addr in the USER area. */
	395	case PTRACE_PEEKUSR: {
	396	unsigned long tmp;
	397
	398	ret = -EIO;
	399	if ((addr & 3) \|\| addr < 0)
	400	break;
	401
	402	if (addr < sizeof(struct pt_regs))
	403	tmp = get_stack_long(child, addr);
	404	else if ((addr >= offsetof(struct user, fpu)) &&
	405	(addr < offsetof(struct user, u_fpvalid))) {
9e1cb206	406	unsigned long index;
c49b6ecf PE	407	ret = init_fpu(child);
	408	if (ret)
	409	break;
9e1cb206 NK	410	index = addr - offsetof(struct user, fpu);
9e1cb206 NK	411	tmp = get_fpu_long(child, index);
1da177e4 LT	412	} else if (addr == offsetof(struct user, u_fpvalid)) {
	413	tmp = !!tsk_used_math(child);
	414	} else {
	415	break;
	416	}
9e1cb206	417	ret = put_user(tmp, datap);
1da177e4 LT	418	break;
	419	}
	420
1da177e4 LT	421	case PTRACE_POKEUSR:
	422	/* write the word at location addr in the USER area. We must
	423	disallow any changes to certain SR bits or u_fpvalid, since
	424	this could crash the kernel or result in a security
	425	loophole. */
	426	ret = -EIO;
	427	if ((addr & 3) \|\| addr < 0)
	428	break;
	429
	430	if (addr < sizeof(struct pt_regs)) {
	431	/* Ignore change of top 32 bits of SR */
	432	if (addr == offsetof (struct pt_regs, sr)+4)
	433	{
	434	ret = 0;
	435	break;
	436	}
	437	/* If lower 32 bits of SR, ignore non-user bits */
	438	if (addr == offsetof (struct pt_regs, sr))
	439	{
	440	long cursr = get_stack_long(child, addr);
	441	data &= ~(SR_MASK);
	442	data \|= (cursr & SR_MASK);
	443	}
	444	ret = put_stack_long(child, addr, data);
	445	}
	446	else if ((addr >= offsetof(struct user, fpu)) &&
	447	(addr < offsetof(struct user, u_fpvalid))) {
9e1cb206	448	unsigned long index;
c49b6ecf PE	449	ret = init_fpu(child);
	450	if (ret)
	451	break;
9e1cb206 NK	452	index = addr - offsetof(struct user, fpu);
9e1cb206 NK	453	ret = put_fpu_long(child, index, data);
1da177e4 LT	454	}
	455	break;
	456
dd76279b PM	457	case PTRACE_GETREGS:
	458	return copy_regset_to_user(child, &user_sh64_native_view,
	459	REGSET_GENERAL,
	460	0, sizeof(struct pt_regs),
9e1cb206	461	datap);
dd76279b PM	462	case PTRACE_SETREGS:
	463	return copy_regset_from_user(child, &user_sh64_native_view,
	464	REGSET_GENERAL,
	465	0, sizeof(struct pt_regs),
9e1cb206	466	datap);
dd76279b PM	467	#ifdef CONFIG_SH_FPU
	468	case PTRACE_GETFPREGS:
	469	return copy_regset_to_user(child, &user_sh64_native_view,
	470	REGSET_FPU,
	471	0, sizeof(struct user_fpu_struct),
9e1cb206	472	datap);
dd76279b PM	473	case PTRACE_SETFPREGS:
	474	return copy_regset_from_user(child, &user_sh64_native_view,
	475	REGSET_FPU,
	476	0, sizeof(struct user_fpu_struct),
9e1cb206	477	datap);
dd76279b	478	#endif
1da177e4 LT	479	default:
	480	ret = ptrace_request(child, request, addr, data);
	481	break;
	482	}
dd76279b	483
1da177e4 LT	484	return ret;
	485	}
	486
9b05a69e NK	487	asmlinkage int sh64_ptrace(long request, long pid,
9b05a69e NK	488	unsigned long addr, unsigned long data)
481bed45	489	{
481bed45	490	#define WPC_DBRMODE 0x0d104008
d71415e8	491	static unsigned long first_call;
481bed45	492
d71415e8	493	if (!test_and_set_bit(0, &first_call)) {
481bed45 CH	494	/* Set WPC.DBRMODE to 0. This makes all debug events get
	495	* delivered through RESVEC, i.e. into the handlers in entry.S.
	496	* (If the kernel was downloaded using a remote gdb, WPC.DBRMODE
	497	* would normally be left set to 1, which makes debug events get
	498	* delivered through DBRVEC, i.e. into the remote gdb's
	499	* handlers. This prevents ptrace getting them, and confuses
	500	* the remote gdb.) */
	501	printk("DBRMODE set to 0 to permit native debugging\n");
	502	poke_real_address_q(WPC_DBRMODE, 0);
481bed45	503	}
481bed45 CH	504
	505	return sys_ptrace(request, pid, addr, data);
	506	}
	507
ab99c733	508	asmlinkage long long do_syscall_trace_enter(struct pt_regs *regs)
1da177e4	509	{
ab99c733	510	long long ret = 0;
1da177e4	511
e4da89d0	512	secure_computing_strict(regs->regs[9]);
c4637d47	513
ab99c733 PM	514	if (test_thread_flag(TIF_SYSCALL_TRACE) &&
	515	tracehook_report_syscall_entry(regs))
	516	/*
	517	* Tracing decided this syscall should not happen.
	518	* We'll return a bogus call number to get an ENOSYS
	519	* error, but leave the original number in regs->regs[0].
	520	*/
	521	ret = -1LL;
4b27c47c	522
a74f7e04 PM	523	if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
	524	trace_sys_enter(regs, regs->regs[9]);
	525
91397401	526	audit_syscall_entry(regs->regs[1], regs->regs[2], regs->regs[3],
b05d8447	527	regs->regs[4], regs->regs[5]);
ab99c733 PM	528
	529	return ret ?: regs->regs[9];
	530	}
	531
	532	asmlinkage void do_syscall_trace_leave(struct pt_regs *regs)
	533	{
4b505db9 PM	534	int step;
4b505db9 PM	535
d7e7528b	536	audit_syscall_exit(regs);
ab99c733	537
a74f7e04 PM	538	if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
	539	trace_sys_exit(regs, regs->regs[9]);
	540
4b505db9 PM	541	step = test_thread_flag(TIF_SINGLESTEP);
	542	if (step \|\| test_thread_flag(TIF_SYSCALL_TRACE))
	543	tracehook_report_syscall_exit(regs, step);
1da177e4 LT	544	}
	545
	546	/* Called with interrupts disabled */
	547	asmlinkage void do_single_step(unsigned long long vec, struct pt_regs *regs)
	548	{
	549	/* This is called after a single step exception (DEBUGSS).
	550	There is no need to change the PC, as it is a post-execution
	551	exception, as entry.S does not do anything to the PC for DEBUGSS.
	552	We need to clear the Single Step setting in SR to avoid
	553	continually stepping. */
	554	local_irq_enable();
	555	regs->sr &= ~SR_SSTEP;
	556	force_sig(SIGTRAP, current);
	557	}
	558
	559	/* Called with interrupts disabled */
a4ae2b2b	560	BUILD_TRAP_HANDLER(breakpoint)
1da177e4	561	{
a4ae2b2b PM	562	TRAP_HANDLER_DECL;
a4ae2b2b PM	563
1da177e4 LT	564	/* We need to forward step the PC, to counteract the backstep done
	565	in signal.c. */
	566	local_irq_enable();
	567	force_sig(SIGTRAP, current);
	568	regs->pc += 4;
	569	}
	570
	571	/*
	572	* Called by kernel/ptrace.c when detaching..
	573	*
	574	* Make sure single step bits etc are not set.
	575	*/
	576	void ptrace_disable(struct task_struct *child)
	577	{
c459dbf2	578	user_disable_single_step(child);
1da177e4	579	}