[net-next-2.6.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/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 <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 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;

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

	case PTRACE_GETREGS:
		return copy_regset_to_user(child, &user_sh64_native_view,
					   REGSET_GENERAL,
					   0, sizeof(struct pt_regs),
					   (void __user *)data);
	case PTRACE_SETREGS:
		return copy_regset_from_user(child, &user_sh64_native_view,
					     REGSET_GENERAL,
					     0, sizeof(struct pt_regs),
					     (const void __user *)data);
#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),
					   (void __user *)data);
	case PTRACE_SETFPREGS:
		return copy_regset_from_user(child, &user_sh64_native_view,
					     REGSET_FPU,
					     0, sizeof(struct user_fpu_struct),
					     (const void __user *)data);
#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);
}

static inline int audit_arch(void)
{
	int arch = EM_SH;

#ifdef CONFIG_64BIT
	arch |= __AUDIT_ARCH_64BIT;
#endif
#ifdef CONFIG_CPU_LITTLE_ENDIAN
	arch |= __AUDIT_ARCH_LE;
#endif

	return arch;
}

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

	secure_computing(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]);

	if (unlikely(current->audit_context))
		audit_syscall_entry(audit_arch(), 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;

	if (unlikely(current->audit_context))
		audit_syscall_exit(AUDITSC_RESULT(regs->regs[9]),
				   regs->regs[9]);

	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>
	21	#include <linux/mm.h>
	22	#include <linux/smp.h>
d71415e8	23	#include <linux/bitops.h>
1da177e4 LT	24	#include <linux/errno.h>
	25	#include <linux/ptrace.h>
	26	#include <linux/user.h>
7ed20e1a	27	#include <linux/signal.h>
481bed45	28	#include <linux/syscalls.h>
4b27c47c	29	#include <linux/audit.h>
c4637d47	30	#include <linux/seccomp.h>
ab99c733	31	#include <linux/tracehook.h>
dd76279b PM	32	#include <linux/elf.h>
dd76279b PM	33	#include <linux/regset.h>
1da177e4 LT	34	#include <asm/io.h>
	35	#include <asm/uaccess.h>
	36	#include <asm/pgtable.h>
	37	#include <asm/system.h>
	38	#include <asm/processor.h>
	39	#include <asm/mmu_context.h>
fa43972f	40	#include <asm/syscalls.h>
50387b3e	41	#include <asm/fpu.h>
1da177e4	42
a74f7e04 PM	43	#define CREATE_TRACE_POINTS
	44	#include <trace/events/syscalls.h>
	45
1da177e4 LT	46	/* This mask defines the bits of the SR which the user is not allowed to
	47	change, which are everything except S, Q, M, PR, SZ, FR. */
	48	#define SR_MASK (0xffff8cfd)
	49
	50	/*
	51	* does not yet catch signals sent when the child dies.
	52	* in exit.c or in signal.c.
	53	*/
	54
	55	/*
	56	* This routine will get a word from the user area in the process kernel stack.
	57	*/
	58	static inline int get_stack_long(struct task_struct *task, int offset)
	59	{
	60	unsigned char *stack;
	61
	62	stack = (unsigned char *)(task->thread.uregs);
	63	stack += offset;
	64	return (((int )stack));
	65	}
	66
	67	static inline unsigned long
	68	get_fpu_long(struct task_struct *task, unsigned long addr)
	69	{
	70	unsigned long tmp;
	71	struct pt_regs *regs;
	72	regs = (struct pt_regs)((unsigned char )task + THREAD_SIZE) - 1;
	73
	74	if (!tsk_used_math(task)) {
	75	if (addr == offsetof(struct user_fpu_struct, fpscr)) {
	76	tmp = FPSCR_INIT;
	77	} else {
	78	tmp = 0xffffffffUL; /* matches initial value in fpu.c */
	79	}
	80	return tmp;
	81	}
	82
	83	if (last_task_used_math == task) {
256b22ca	84	enable_fpu();
61cc7b0a	85	save_fpu(task);
256b22ca	86	disable_fpu();
1da177e4 LT	87	last_task_used_math = 0;
	88	regs->sr \|= SR_FD;
	89	}
	90
3ef2932b	91	tmp = ((long *)task->thread.xstate)[addr / sizeof(unsigned long)];
1da177e4 LT	92	return tmp;
	93	}
	94
	95	/*
	96	* This routine will put a word into the user area in the process kernel stack.
	97	*/
	98	static inline int put_stack_long(struct task_struct *task, int offset,
	99	unsigned long data)
	100	{
	101	unsigned char *stack;
	102
	103	stack = (unsigned char *)(task->thread.uregs);
	104	stack += offset;
	105	(unsigned long ) stack = data;
	106	return 0;
	107	}
	108
	109	static inline int
	110	put_fpu_long(struct task_struct *task, unsigned long addr, unsigned long data)
	111	{
	112	struct pt_regs *regs;
	113
	114	regs = (struct pt_regs)((unsigned char )task + THREAD_SIZE) - 1;
	115
	116	if (!tsk_used_math(task)) {
d6db8888	117	init_fpu(task);
1da177e4	118	} else if (last_task_used_math == task) {
256b22ca	119	enable_fpu();
61cc7b0a	120	save_fpu(task);
256b22ca	121	disable_fpu();
1da177e4 LT	122	last_task_used_math = 0;
	123	regs->sr \|= SR_FD;
	124	}
	125
3ef2932b	126	((long *)task->thread.xstate)[addr / sizeof(unsigned long)] = data;
1da177e4 LT	127	return 0;
	128	}
	129
c459dbf2 PM	130	void user_enable_single_step(struct task_struct *child)
	131	{
	132	struct pt_regs *regs = child->thread.uregs;
	133
	134	regs->sr \|= SR_SSTEP; /* auto-resetting upon exception */
4b505db9 PM	135
4b505db9 PM	136	set_tsk_thread_flag(child, TIF_SINGLESTEP);
c459dbf2 PM	137	}
	138
	139	void user_disable_single_step(struct task_struct *child)
	140	{
e311be52 AB	141	struct pt_regs *regs = child->thread.uregs;
e311be52 AB	142
c459dbf2	143	regs->sr &= ~SR_SSTEP;
4b505db9 PM	144
4b505db9 PM	145	clear_tsk_thread_flag(child, TIF_SINGLESTEP);
c459dbf2	146	}
481bed45	147
dd76279b PM	148	static int genregs_get(struct task_struct *target,
	149	const struct user_regset *regset,
	150	unsigned int pos, unsigned int count,
	151	void kbuf, void __user ubuf)
	152	{
	153	const struct pt_regs *regs = task_pt_regs(target);
	154	int ret;
	155
	156	/* PC, SR, SYSCALL */
	157	ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
	158	&regs->pc,
	159	0, 3 * sizeof(unsigned long long));
	160
	161	/* R1 -> R63 */
	162	if (!ret)
	163	ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
	164	regs->regs,
	165	offsetof(struct pt_regs, regs[0]),
	166	63 * sizeof(unsigned long long));
	167	/* TR0 -> TR7 */
	168	if (!ret)
	169	ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
	170	regs->tregs,
	171	offsetof(struct pt_regs, tregs[0]),
	172	8 * sizeof(unsigned long long));
	173
	174	if (!ret)
	175	ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
	176	sizeof(struct pt_regs), -1);
	177
	178	return ret;
	179	}
	180
	181	static int genregs_set(struct task_struct *target,
	182	const struct user_regset *regset,
	183	unsigned int pos, unsigned int count,
	184	const void kbuf, const void __user ubuf)
	185	{
	186	struct pt_regs *regs = task_pt_regs(target);
	187	int ret;
	188
	189	/* PC, SR, SYSCALL */
	190	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
	191	&regs->pc,
	192	0, 3 * sizeof(unsigned long long));
	193
	194	/* R1 -> R63 */
	195	if (!ret && count > 0)
	196	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
	197	regs->regs,
	198	offsetof(struct pt_regs, regs[0]),
	199	63 * sizeof(unsigned long long));
	200
	201	/* TR0 -> TR7 */
	202	if (!ret && count > 0)
	203	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
	204	regs->tregs,
	205	offsetof(struct pt_regs, tregs[0]),
	206	8 * sizeof(unsigned long long));
	207
	208	if (!ret)
	209	ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
	210	sizeof(struct pt_regs), -1);
	211
212	return ret;
213	}
214
215	#ifdef CONFIG_SH_FPU
216	int fpregs_get(struct task_struct *target,
217	const struct user_regset *regset,
218	unsigned int pos, unsigned int count,
219	void kbuf, void __user ubuf)
220	{
221	int ret;
222
223	ret = init_fpu(target);
224	if (ret)
225	return ret;
226
227	return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
3ef2932b	228	&target->thread.xstate->hardfpu, 0, -1);
dd76279b PM	229	}
	230
	231	static int fpregs_set(struct task_struct *target,
	232	const struct user_regset *regset,
	233	unsigned int pos, unsigned int count,
	234	const void kbuf, const void __user ubuf)
	235	{
	236	int ret;
	237
	238	ret = init_fpu(target);
	239	if (ret)
	240	return ret;
	241
	242	set_stopped_child_used_math(target);
	243
	244	return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
3ef2932b	245	&target->thread.xstate->hardfpu, 0, -1);
dd76279b PM	246	}
	247
	248	static int fpregs_active(struct task_struct *target,
	249	const struct user_regset *regset)
	250	{
	251	return tsk_used_math(target) ? regset->n : 0;
	252	}
	253	#endif
	254
eaaaeef3 PM	255	const struct pt_regs_offset regoffset_table[] = {
	256	REG_OFFSET_NAME(pc),
	257	REG_OFFSET_NAME(sr),
	258	REG_OFFSET_NAME(syscall_nr),
	259	REGS_OFFSET_NAME(0),
	260	REGS_OFFSET_NAME(1),
	261	REGS_OFFSET_NAME(2),
	262	REGS_OFFSET_NAME(3),
	263	REGS_OFFSET_NAME(4),
	264	REGS_OFFSET_NAME(5),
	265	REGS_OFFSET_NAME(6),
	266	REGS_OFFSET_NAME(7),
	267	REGS_OFFSET_NAME(8),
	268	REGS_OFFSET_NAME(9),
	269	REGS_OFFSET_NAME(10),
	270	REGS_OFFSET_NAME(11),
	271	REGS_OFFSET_NAME(12),
	272	REGS_OFFSET_NAME(13),
	273	REGS_OFFSET_NAME(14),
	274	REGS_OFFSET_NAME(15),
	275	REGS_OFFSET_NAME(16),
	276	REGS_OFFSET_NAME(17),
	277	REGS_OFFSET_NAME(18),
	278	REGS_OFFSET_NAME(19),
	279	REGS_OFFSET_NAME(20),
	280	REGS_OFFSET_NAME(21),
	281	REGS_OFFSET_NAME(22),
	282	REGS_OFFSET_NAME(23),
	283	REGS_OFFSET_NAME(24),
	284	REGS_OFFSET_NAME(25),
	285	REGS_OFFSET_NAME(26),
	286	REGS_OFFSET_NAME(27),
	287	REGS_OFFSET_NAME(28),
	288	REGS_OFFSET_NAME(29),
	289	REGS_OFFSET_NAME(30),
	290	REGS_OFFSET_NAME(31),
	291	REGS_OFFSET_NAME(32),
	292	REGS_OFFSET_NAME(33),
	293	REGS_OFFSET_NAME(34),
	294	REGS_OFFSET_NAME(35),
	295	REGS_OFFSET_NAME(36),
	296	REGS_OFFSET_NAME(37),
	297	REGS_OFFSET_NAME(38),
	298	REGS_OFFSET_NAME(39),
	299	REGS_OFFSET_NAME(40),
	300	REGS_OFFSET_NAME(41),
	301	REGS_OFFSET_NAME(42),
	302	REGS_OFFSET_NAME(43),
	303	REGS_OFFSET_NAME(44),
	304	REGS_OFFSET_NAME(45),
	305	REGS_OFFSET_NAME(46),
	306	REGS_OFFSET_NAME(47),
	307	REGS_OFFSET_NAME(48),
	308	REGS_OFFSET_NAME(49),
	309	REGS_OFFSET_NAME(50),
	310	REGS_OFFSET_NAME(51),
	311	REGS_OFFSET_NAME(52),
	312	REGS_OFFSET_NAME(53),
	313	REGS_OFFSET_NAME(54),
	314	REGS_OFFSET_NAME(55),
	315	REGS_OFFSET_NAME(56),
	316	REGS_OFFSET_NAME(57),
	317	REGS_OFFSET_NAME(58),
	318	REGS_OFFSET_NAME(59),
319	REGS_OFFSET_NAME(60),
320	REGS_OFFSET_NAME(61),
321	REGS_OFFSET_NAME(62),
322	REGS_OFFSET_NAME(63),
323	TREGS_OFFSET_NAME(0),
324	TREGS_OFFSET_NAME(1),
325	TREGS_OFFSET_NAME(2),
326	TREGS_OFFSET_NAME(3),
327	TREGS_OFFSET_NAME(4),
328	TREGS_OFFSET_NAME(5),
329	TREGS_OFFSET_NAME(6),
330	TREGS_OFFSET_NAME(7),
331	REG_OFFSET_END,
332	};
333
dd76279b PM	334	/*
	335	* These are our native regset flavours.
	336	*/
	337	enum sh_regset {
	338	REGSET_GENERAL,
	339	#ifdef CONFIG_SH_FPU
	340	REGSET_FPU,
	341	#endif
	342	};
	343
	344	static const struct user_regset sh_regsets[] = {
	345	/*
	346	* Format is:
	347	* PC, SR, SYSCALL,
	348	* R1 --> R63,
	349	* TR0 --> TR7,
	350	*/
	351	[REGSET_GENERAL] = {
	352	.core_note_type = NT_PRSTATUS,
	353	.n = ELF_NGREG,
	354	.size = sizeof(long long),
	355	.align = sizeof(long long),
	356	.get = genregs_get,
	357	.set = genregs_set,
	358	},
	359
	360	#ifdef CONFIG_SH_FPU
	361	[REGSET_FPU] = {
	362	.core_note_type = NT_PRFPREG,
	363	.n = sizeof(struct user_fpu_struct) /
	364	sizeof(long long),
	365	.size = sizeof(long long),
	366	.align = sizeof(long long),
	367	.get = fpregs_get,
	368	.set = fpregs_set,
	369	.active = fpregs_active,
	370	},
	371	#endif
	372	};
	373
	374	static const struct user_regset_view user_sh64_native_view = {
	375	.name = "sh64",
	376	.e_machine = EM_SH,
	377	.regsets = sh_regsets,
	378	.n = ARRAY_SIZE(sh_regsets),
	379	};
	380
	381	const struct user_regset_view task_user_regset_view(struct task_struct task)
	382	{
	383	return &user_sh64_native_view;
	384	}
	385
9b05a69e NK	386	long arch_ptrace(struct task_struct *child, long request,
9b05a69e NK	387	unsigned long addr, unsigned long data)
1da177e4	388	{
1da177e4 LT	389	int ret;
1da177e4 LT	390
1da177e4	391	switch (request) {
1da177e4 LT	392	/* read the word at location addr in the USER area. */
	393	case PTRACE_PEEKUSR: {
	394	unsigned long tmp;
	395
	396	ret = -EIO;
	397	if ((addr & 3) \|\| addr < 0)
	398	break;
	399
	400	if (addr < sizeof(struct pt_regs))
	401	tmp = get_stack_long(child, addr);
	402	else if ((addr >= offsetof(struct user, fpu)) &&
	403	(addr < offsetof(struct user, u_fpvalid))) {
	404	tmp = get_fpu_long(child, addr - offsetof(struct user, fpu));
	405	} else if (addr == offsetof(struct user, u_fpvalid)) {
	406	tmp = !!tsk_used_math(child);
	407	} else {
	408	break;
	409	}
	410	ret = put_user(tmp, (unsigned long *)data);
	411	break;
	412	}
	413
1da177e4 LT	414	case PTRACE_POKEUSR:
	415	/* write the word at location addr in the USER area. We must
	416	disallow any changes to certain SR bits or u_fpvalid, since
	417	this could crash the kernel or result in a security
	418	loophole. */
	419	ret = -EIO;
	420	if ((addr & 3) \|\| addr < 0)
	421	break;
	422
	423	if (addr < sizeof(struct pt_regs)) {
	424	/* Ignore change of top 32 bits of SR */
	425	if (addr == offsetof (struct pt_regs, sr)+4)
	426	{
	427	ret = 0;
	428	break;
	429	}
	430	/* If lower 32 bits of SR, ignore non-user bits */
	431	if (addr == offsetof (struct pt_regs, sr))
	432	{
	433	long cursr = get_stack_long(child, addr);
	434	data &= ~(SR_MASK);
	435	data \|= (cursr & SR_MASK);
	436	}
	437	ret = put_stack_long(child, addr, data);
	438	}
	439	else if ((addr >= offsetof(struct user, fpu)) &&
	440	(addr < offsetof(struct user, u_fpvalid))) {
	441	ret = put_fpu_long(child, addr - offsetof(struct user, fpu), data);
	442	}
	443	break;
	444
dd76279b PM	445	case PTRACE_GETREGS:
	446	return copy_regset_to_user(child, &user_sh64_native_view,
	447	REGSET_GENERAL,
	448	0, sizeof(struct pt_regs),
	449	(void __user *)data);
	450	case PTRACE_SETREGS:
	451	return copy_regset_from_user(child, &user_sh64_native_view,
	452	REGSET_GENERAL,
	453	0, sizeof(struct pt_regs),
	454	(const void __user *)data);
	455	#ifdef CONFIG_SH_FPU
	456	case PTRACE_GETFPREGS:
	457	return copy_regset_to_user(child, &user_sh64_native_view,
	458	REGSET_FPU,
	459	0, sizeof(struct user_fpu_struct),
	460	(void __user *)data);
	461	case PTRACE_SETFPREGS:
	462	return copy_regset_from_user(child, &user_sh64_native_view,
	463	REGSET_FPU,
	464	0, sizeof(struct user_fpu_struct),
	465	(const void __user *)data);
	466	#endif
1da177e4 LT	467	default:
	468	ret = ptrace_request(child, request, addr, data);
	469	break;
	470	}
dd76279b	471
1da177e4 LT	472	return ret;
	473	}
	474
9b05a69e NK	475	asmlinkage int sh64_ptrace(long request, long pid,
9b05a69e NK	476	unsigned long addr, unsigned long data)
481bed45	477	{
481bed45	478	#define WPC_DBRMODE 0x0d104008
d71415e8	479	static unsigned long first_call;
481bed45	480
d71415e8	481	if (!test_and_set_bit(0, &first_call)) {
481bed45 CH	482	/* Set WPC.DBRMODE to 0. This makes all debug events get
	483	* delivered through RESVEC, i.e. into the handlers in entry.S.
	484	* (If the kernel was downloaded using a remote gdb, WPC.DBRMODE
	485	* would normally be left set to 1, which makes debug events get
	486	* delivered through DBRVEC, i.e. into the remote gdb's
	487	* handlers. This prevents ptrace getting them, and confuses
	488	* the remote gdb.) */
	489	printk("DBRMODE set to 0 to permit native debugging\n");
	490	poke_real_address_q(WPC_DBRMODE, 0);
481bed45	491	}
481bed45 CH	492
	493	return sys_ptrace(request, pid, addr, data);
	494	}
	495
9e5e2117 PM	496	static inline int audit_arch(void)
	497	{
	498	int arch = EM_SH;
	499
	500	#ifdef CONFIG_64BIT
	501	arch \|= __AUDIT_ARCH_64BIT;
	502	#endif
	503	#ifdef CONFIG_CPU_LITTLE_ENDIAN
	504	arch \|= __AUDIT_ARCH_LE;
	505	#endif
	506
	507	return arch;
	508	}
	509
ab99c733	510	asmlinkage long long do_syscall_trace_enter(struct pt_regs *regs)
1da177e4	511	{
ab99c733	512	long long ret = 0;
1da177e4	513
c4637d47 PM	514	secure_computing(regs->regs[9]);
c4637d47 PM	515
ab99c733 PM	516	if (test_thread_flag(TIF_SYSCALL_TRACE) &&
	517	tracehook_report_syscall_entry(regs))
	518	/*
	519	* Tracing decided this syscall should not happen.
	520	* We'll return a bogus call number to get an ENOSYS
	521	* error, but leave the original number in regs->regs[0].
	522	*/
	523	ret = -1LL;
4b27c47c	524
a74f7e04 PM	525	if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
	526	trace_sys_enter(regs, regs->regs[9]);
	527
ab99c733	528	if (unlikely(current->audit_context))
9e5e2117	529	audit_syscall_entry(audit_arch(), regs->regs[1],
4b27c47c PM	530	regs->regs[2], regs->regs[3],
4b27c47c PM	531	regs->regs[4], regs->regs[5]);
ab99c733 PM	532
	533	return ret ?: regs->regs[9];
	534	}
	535
	536	asmlinkage void do_syscall_trace_leave(struct pt_regs *regs)
	537	{
4b505db9 PM	538	int step;
4b505db9 PM	539
ab99c733 PM	540	if (unlikely(current->audit_context))
	541	audit_syscall_exit(AUDITSC_RESULT(regs->regs[9]),
	542	regs->regs[9]);
	543
a74f7e04 PM	544	if (unlikely(test_thread_flag(TIF_SYSCALL_TRACEPOINT)))
	545	trace_sys_exit(regs, regs->regs[9]);
	546
4b505db9 PM	547	step = test_thread_flag(TIF_SINGLESTEP);
	548	if (step \|\| test_thread_flag(TIF_SYSCALL_TRACE))
	549	tracehook_report_syscall_exit(regs, step);
1da177e4 LT	550	}
	551
	552	/* Called with interrupts disabled */
	553	asmlinkage void do_single_step(unsigned long long vec, struct pt_regs *regs)
	554	{
	555	/* This is called after a single step exception (DEBUGSS).
	556	There is no need to change the PC, as it is a post-execution
	557	exception, as entry.S does not do anything to the PC for DEBUGSS.
	558	We need to clear the Single Step setting in SR to avoid
	559	continually stepping. */
	560	local_irq_enable();
	561	regs->sr &= ~SR_SSTEP;
	562	force_sig(SIGTRAP, current);
	563	}
	564
	565	/* Called with interrupts disabled */
a4ae2b2b	566	BUILD_TRAP_HANDLER(breakpoint)
1da177e4	567	{
a4ae2b2b PM	568	TRAP_HANDLER_DECL;
a4ae2b2b PM	569
1da177e4 LT	570	/* We need to forward step the PC, to counteract the backstep done
	571	in signal.c. */
	572	local_irq_enable();
	573	force_sig(SIGTRAP, current);
	574	regs->pc += 4;
	575	}
	576
	577	/*
	578	* Called by kernel/ptrace.c when detaching..
	579	*
	580	* Make sure single step bits etc are not set.
	581	*/
	582	void ptrace_disable(struct task_struct *child)
	583	{
c459dbf2	584	user_disable_single_step(child);
1da177e4	585	}