[GitHub/mt8127/android_kernel_alcatel_ttab.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/smp_lock.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>

/* 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, regs);
		disable_fpu();
		last_task_used_math = 0;
		regs->sr |= SR_FD;
	}

	tmp = ((long *)&task->thread.fpu)[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)) {
		fpinit(&task->thread.fpu.hard);
		set_stopped_child_used_math(task);
	} else if (last_task_used_math == task) {
		enable_fpu();
		save_fpu(task, regs);
		disable_fpu();
		last_task_used_math = 0;
		regs->sr |= SR_FD;
	}

	((long *)&task->thread.fpu)[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 */
}

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

	regs->sr &= ~SR_SSTEP;
}

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.fpu.hard, 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.fpu.hard, 0, -1);
}

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

/*
 * 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, long addr, 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, long addr, long data)
{
#define WPC_DBRMODE 0x0d104008
	static int first_call = 1;

	lock_kernel();
	if (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);
		first_call = 0;
	}
	unlock_kernel();

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

	if (test_thread_flag(TIF_SYSCALL_TRACE))
		tracehook_report_syscall_exit(regs, 0);
}

/* 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 */
asmlinkage void do_software_break_point(unsigned long long vec,
					struct pt_regs *regs)
{
	/* 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>
	23	#include <linux/smp_lock.h>
	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 LT	42
	43	/* This mask defines the bits of the SR which the user is not allowed to
	44	change, which are everything except S, Q, M, PR, SZ, FR. */
	45	#define SR_MASK (0xffff8cfd)
	46
	47	/*
	48	* does not yet catch signals sent when the child dies.
	49	* in exit.c or in signal.c.
	50	*/
	51
	52	/*
	53	* This routine will get a word from the user area in the process kernel stack.
	54	*/
	55	static inline int get_stack_long(struct task_struct *task, int offset)
	56	{
	57	unsigned char *stack;
	58
	59	stack = (unsigned char *)(task->thread.uregs);
	60	stack += offset;
	61	return (((int )stack));
	62	}
	63
	64	static inline unsigned long
	65	get_fpu_long(struct task_struct *task, unsigned long addr)
	66	{
	67	unsigned long tmp;
	68	struct pt_regs *regs;
	69	regs = (struct pt_regs)((unsigned char )task + THREAD_SIZE) - 1;
	70
	71	if (!tsk_used_math(task)) {
	72	if (addr == offsetof(struct user_fpu_struct, fpscr)) {
	73	tmp = FPSCR_INIT;
	74	} else {
	75	tmp = 0xffffffffUL; /* matches initial value in fpu.c */
	76	}
	77	return tmp;
	78	}
	79
	80	if (last_task_used_math == task) {
256b22ca	81	enable_fpu();
332fd57b	82	save_fpu(task, regs);
256b22ca	83	disable_fpu();
1da177e4 LT	84	last_task_used_math = 0;
	85	regs->sr \|= SR_FD;
	86	}
	87
	88	tmp = ((long *)&task->thread.fpu)[addr / sizeof(unsigned long)];
	89	return tmp;
	90	}
	91
	92	/*
	93	* This routine will put a word into the user area in the process kernel stack.
	94	*/
	95	static inline int put_stack_long(struct task_struct *task, int offset,
	96	unsigned long data)
	97	{
	98	unsigned char *stack;
	99
	100	stack = (unsigned char *)(task->thread.uregs);
	101	stack += offset;
	102	(unsigned long ) stack = data;
	103	return 0;
	104	}
	105
	106	static inline int
	107	put_fpu_long(struct task_struct *task, unsigned long addr, unsigned long data)
	108	{
	109	struct pt_regs *regs;
	110
	111	regs = (struct pt_regs)((unsigned char )task + THREAD_SIZE) - 1;
	112
	113	if (!tsk_used_math(task)) {
	114	fpinit(&task->thread.fpu.hard);
	115	set_stopped_child_used_math(task);
	116	} else if (last_task_used_math == task) {
256b22ca	117	enable_fpu();
332fd57b	118	save_fpu(task, regs);
256b22ca	119	disable_fpu();
1da177e4 LT	120	last_task_used_math = 0;
	121	regs->sr \|= SR_FD;
	122	}
	123
	124	((long *)&task->thread.fpu)[addr / sizeof(unsigned long)] = data;
	125	return 0;
	126	}
	127
c459dbf2 PM	128	void user_enable_single_step(struct task_struct *child)
	129	{
	130	struct pt_regs *regs = child->thread.uregs;
	131
	132	regs->sr \|= SR_SSTEP; /* auto-resetting upon exception */
	133	}
	134
	135	void user_disable_single_step(struct task_struct *child)
	136	{
e311be52 AB	137	struct pt_regs *regs = child->thread.uregs;
e311be52 AB	138
c459dbf2 PM	139	regs->sr &= ~SR_SSTEP;
c459dbf2 PM	140	}
481bed45	141
dd76279b PM	142	static int genregs_get(struct task_struct *target,
	143	const struct user_regset *regset,
	144	unsigned int pos, unsigned int count,
	145	void kbuf, void __user ubuf)
	146	{
	147	const struct pt_regs *regs = task_pt_regs(target);
	148	int ret;
	149
	150	/* PC, SR, SYSCALL */
	151	ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
	152	&regs->pc,
	153	0, 3 * sizeof(unsigned long long));
	154
	155	/* R1 -> R63 */
	156	if (!ret)
	157	ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
	158	regs->regs,
	159	offsetof(struct pt_regs, regs[0]),
	160	63 * sizeof(unsigned long long));
	161	/* TR0 -> TR7 */
	162	if (!ret)
	163	ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
	164	regs->tregs,
	165	offsetof(struct pt_regs, tregs[0]),
	166	8 * sizeof(unsigned long long));
	167
	168	if (!ret)
	169	ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
	170	sizeof(struct pt_regs), -1);
	171
	172	return ret;
	173	}
	174
	175	static int genregs_set(struct task_struct *target,
	176	const struct user_regset *regset,
	177	unsigned int pos, unsigned int count,
	178	const void kbuf, const void __user ubuf)
	179	{
	180	struct pt_regs *regs = task_pt_regs(target);
	181	int ret;
	182
	183	/* PC, SR, SYSCALL */
	184	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
	185	&regs->pc,
	186	0, 3 * sizeof(unsigned long long));
	187
	188	/* R1 -> R63 */
	189	if (!ret && count > 0)
	190	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
	191	regs->regs,
	192	offsetof(struct pt_regs, regs[0]),
	193	63 * sizeof(unsigned long long));
	194
	195	/* TR0 -> TR7 */
	196	if (!ret && count > 0)
	197	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
	198	regs->tregs,
	199	offsetof(struct pt_regs, tregs[0]),
	200	8 * sizeof(unsigned long long));
	201
	202	if (!ret)
	203	ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
	204	sizeof(struct pt_regs), -1);
	205
206	return ret;
207	}
208
209	#ifdef CONFIG_SH_FPU
210	int fpregs_get(struct task_struct *target,
211	const struct user_regset *regset,
212	unsigned int pos, unsigned int count,
213	void kbuf, void __user ubuf)
214	{
215	int ret;
216
217	ret = init_fpu(target);
218	if (ret)
219	return ret;
220
221	return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
222	&target->thread.fpu.hard, 0, -1);
223	}
224
225	static int fpregs_set(struct task_struct *target,
226	const struct user_regset *regset,
227	unsigned int pos, unsigned int count,
228	const void kbuf, const void __user ubuf)
229	{
230	int ret;
231
232	ret = init_fpu(target);
233	if (ret)
234	return ret;
235
236	set_stopped_child_used_math(target);
237
238	return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
239	&target->thread.fpu.hard, 0, -1);
240	}
241
242	static int fpregs_active(struct task_struct *target,
243	const struct user_regset *regset)
244	{
245	return tsk_used_math(target) ? regset->n : 0;
246	}
247	#endif
248
249	/*
250	* These are our native regset flavours.
251	*/
252	enum sh_regset {
253	REGSET_GENERAL,
254	#ifdef CONFIG_SH_FPU
255	REGSET_FPU,
256	#endif
257	};
258
259	static const struct user_regset sh_regsets[] = {
260	/*
261	* Format is:
262	* PC, SR, SYSCALL,
263	* R1 --> R63,
264	* TR0 --> TR7,
265	*/
266	[REGSET_GENERAL] = {
267	.core_note_type = NT_PRSTATUS,
268	.n = ELF_NGREG,
269	.size = sizeof(long long),
270	.align = sizeof(long long),
271	.get = genregs_get,
272	.set = genregs_set,
273	},
274
275	#ifdef CONFIG_SH_FPU
276	[REGSET_FPU] = {
277	.core_note_type = NT_PRFPREG,
278	.n = sizeof(struct user_fpu_struct) /
279	sizeof(long long),
280	.size = sizeof(long long),
281	.align = sizeof(long long),
282	.get = fpregs_get,
283	.set = fpregs_set,
284	.active = fpregs_active,
285	},
286	#endif
287	};
288
289	static const struct user_regset_view user_sh64_native_view = {
290	.name = "sh64",
291	.e_machine = EM_SH,
292	.regsets = sh_regsets,
293	.n = ARRAY_SIZE(sh_regsets),
294	};
295
296	const struct user_regset_view task_user_regset_view(struct task_struct task)
297	{
298	return &user_sh64_native_view;
299	}
300
481bed45	301	long arch_ptrace(struct task_struct *child, long request, long addr, long data)
1da177e4	302	{
1da177e4 LT	303	int ret;
1da177e4 LT	304
1da177e4	305	switch (request) {
1da177e4 LT	306	/* read the word at location addr in the USER area. */
	307	case PTRACE_PEEKUSR: {
	308	unsigned long tmp;
	309
	310	ret = -EIO;
	311	if ((addr & 3) \|\| addr < 0)
	312	break;
	313
	314	if (addr < sizeof(struct pt_regs))
	315	tmp = get_stack_long(child, addr);
	316	else if ((addr >= offsetof(struct user, fpu)) &&
	317	(addr < offsetof(struct user, u_fpvalid))) {
	318	tmp = get_fpu_long(child, addr - offsetof(struct user, fpu));
	319	} else if (addr == offsetof(struct user, u_fpvalid)) {
	320	tmp = !!tsk_used_math(child);
	321	} else {
	322	break;
	323	}
	324	ret = put_user(tmp, (unsigned long *)data);
	325	break;
	326	}
	327
1da177e4 LT	328	case PTRACE_POKEUSR:
	329	/* write the word at location addr in the USER area. We must
	330	disallow any changes to certain SR bits or u_fpvalid, since
	331	this could crash the kernel or result in a security
	332	loophole. */
	333	ret = -EIO;
	334	if ((addr & 3) \|\| addr < 0)
	335	break;
	336
	337	if (addr < sizeof(struct pt_regs)) {
	338	/* Ignore change of top 32 bits of SR */
	339	if (addr == offsetof (struct pt_regs, sr)+4)
	340	{
	341	ret = 0;
	342	break;
	343	}
	344	/* If lower 32 bits of SR, ignore non-user bits */
	345	if (addr == offsetof (struct pt_regs, sr))
	346	{
	347	long cursr = get_stack_long(child, addr);
	348	data &= ~(SR_MASK);
	349	data \|= (cursr & SR_MASK);
	350	}
	351	ret = put_stack_long(child, addr, data);
	352	}
	353	else if ((addr >= offsetof(struct user, fpu)) &&
	354	(addr < offsetof(struct user, u_fpvalid))) {
	355	ret = put_fpu_long(child, addr - offsetof(struct user, fpu), data);
	356	}
	357	break;
	358
dd76279b PM	359	case PTRACE_GETREGS:
	360	return copy_regset_to_user(child, &user_sh64_native_view,
	361	REGSET_GENERAL,
	362	0, sizeof(struct pt_regs),
	363	(void __user *)data);
	364	case PTRACE_SETREGS:
	365	return copy_regset_from_user(child, &user_sh64_native_view,
	366	REGSET_GENERAL,
	367	0, sizeof(struct pt_regs),
	368	(const void __user *)data);
	369	#ifdef CONFIG_SH_FPU
	370	case PTRACE_GETFPREGS:
	371	return copy_regset_to_user(child, &user_sh64_native_view,
	372	REGSET_FPU,
	373	0, sizeof(struct user_fpu_struct),
	374	(void __user *)data);
	375	case PTRACE_SETFPREGS:
	376	return copy_regset_from_user(child, &user_sh64_native_view,
	377	REGSET_FPU,
	378	0, sizeof(struct user_fpu_struct),
	379	(const void __user *)data);
	380	#endif
1da177e4 LT	381	default:
	382	ret = ptrace_request(child, request, addr, data);
	383	break;
	384	}
dd76279b	385
1da177e4 LT	386	return ret;
	387	}
	388
481bed45 CH	389	asmlinkage int sh64_ptrace(long request, long pid, long addr, long data)
481bed45 CH	390	{
481bed45 CH	391	#define WPC_DBRMODE 0x0d104008
	392	static int first_call = 1;
	393
	394	lock_kernel();
	395	if (first_call) {
	396	/* Set WPC.DBRMODE to 0. This makes all debug events get
	397	* delivered through RESVEC, i.e. into the handlers in entry.S.
	398	* (If the kernel was downloaded using a remote gdb, WPC.DBRMODE
	399	* would normally be left set to 1, which makes debug events get
	400	* delivered through DBRVEC, i.e. into the remote gdb's
	401	* handlers. This prevents ptrace getting them, and confuses
	402	* the remote gdb.) */
	403	printk("DBRMODE set to 0 to permit native debugging\n");
	404	poke_real_address_q(WPC_DBRMODE, 0);
	405	first_call = 0;
	406	}
	407	unlock_kernel();
	408
	409	return sys_ptrace(request, pid, addr, data);
	410	}
	411
9e5e2117 PM	412	static inline int audit_arch(void)
	413	{
	414	int arch = EM_SH;
	415
	416	#ifdef CONFIG_64BIT
	417	arch \|= __AUDIT_ARCH_64BIT;
	418	#endif
	419	#ifdef CONFIG_CPU_LITTLE_ENDIAN
	420	arch \|= __AUDIT_ARCH_LE;
	421	#endif
	422
	423	return arch;
	424	}
	425
ab99c733	426	asmlinkage long long do_syscall_trace_enter(struct pt_regs *regs)
1da177e4	427	{
ab99c733	428	long long ret = 0;
1da177e4	429
c4637d47 PM	430	secure_computing(regs->regs[9]);
c4637d47 PM	431
ab99c733 PM	432	if (test_thread_flag(TIF_SYSCALL_TRACE) &&
	433	tracehook_report_syscall_entry(regs))
	434	/*
	435	* Tracing decided this syscall should not happen.
	436	* We'll return a bogus call number to get an ENOSYS
	437	* error, but leave the original number in regs->regs[0].
	438	*/
	439	ret = -1LL;
4b27c47c	440
ab99c733	441	if (unlikely(current->audit_context))
9e5e2117	442	audit_syscall_entry(audit_arch(), regs->regs[1],
4b27c47c PM	443	regs->regs[2], regs->regs[3],
4b27c47c PM	444	regs->regs[4], regs->regs[5]);
ab99c733 PM	445
	446	return ret ?: regs->regs[9];
	447	}
	448
	449	asmlinkage void do_syscall_trace_leave(struct pt_regs *regs)
	450	{
	451	if (unlikely(current->audit_context))
	452	audit_syscall_exit(AUDITSC_RESULT(regs->regs[9]),
	453	regs->regs[9]);
	454
	455	if (test_thread_flag(TIF_SYSCALL_TRACE))
	456	tracehook_report_syscall_exit(regs, 0);
1da177e4 LT	457	}
	458
	459	/* Called with interrupts disabled */
	460	asmlinkage void do_single_step(unsigned long long vec, struct pt_regs *regs)
	461	{
	462	/* This is called after a single step exception (DEBUGSS).
	463	There is no need to change the PC, as it is a post-execution
	464	exception, as entry.S does not do anything to the PC for DEBUGSS.
	465	We need to clear the Single Step setting in SR to avoid
	466	continually stepping. */
	467	local_irq_enable();
	468	regs->sr &= ~SR_SSTEP;
	469	force_sig(SIGTRAP, current);
	470	}
	471
	472	/* Called with interrupts disabled */
	473	asmlinkage void do_software_break_point(unsigned long long vec,
	474	struct pt_regs *regs)
	475	{
	476	/* We need to forward step the PC, to counteract the backstep done
	477	in signal.c. */
	478	local_irq_enable();
	479	force_sig(SIGTRAP, current);
	480	regs->pc += 4;
	481	}
	482
	483	/*
	484	* Called by kernel/ptrace.c when detaching..
	485	*
	486	* Make sure single step bits etc are not set.
	487	*/
	488	void ptrace_disable(struct task_struct *child)
	489	{
c459dbf2	490	user_disable_single_step(child);
1da177e4	491	}