[linux.git] / arch / score / kernel / ptrace.c

/*
 * arch/score/kernel/ptrace.c
 *
 * Score Processor version.
 *
 * Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
 *  Chen Liqin <[email protected]>
 *  Lennox Wu <[email protected]>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see the file COPYING, or write
 * to the Free Software Foundation, Inc.,
 * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

#include <linux/elf.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/ptrace.h>
#include <linux/regset.h>
#include <linux/sched/task_stack.h>

#include <linux/uaccess.h>

/*
 * retrieve the contents of SCORE userspace general registers
 */
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;

	/* skip 9 * sizeof(unsigned long) not use for pt_regs */
	ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
					0, offsetof(struct pt_regs, regs));

	/* r0 - r31, cel, ceh, sr0, sr1, sr2, epc, ema, psr, ecr, condition */
	ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
				  regs->regs,
				  offsetof(struct pt_regs, regs),
				  offsetof(struct pt_regs, cp0_condition));

	if (!ret)
		ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
						sizeof(struct pt_regs), -1);

	return ret;
}

/*
 * update the contents of the SCORE userspace general registers
 */
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;

	/* skip 9 * sizeof(unsigned long) */
	ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
					0, offsetof(struct pt_regs, regs));

	/* r0 - r31, cel, ceh, sr0, sr1, sr2, epc, ema, psr, ecr, condition */
	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
				  regs->regs,
				  offsetof(struct pt_regs, regs),
				  offsetof(struct pt_regs, cp0_condition));

	if (!ret)
		ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
						sizeof(struct pt_regs), -1);

	return ret;
}

/*
 * Define the register sets available on the score7 under Linux
 */
enum score7_regset {
	REGSET_GENERAL,
};

static const struct user_regset score7_regsets[] = {
	[REGSET_GENERAL] = {
		.core_note_type	= NT_PRSTATUS,
		.n		= ELF_NGREG,
		.size		= sizeof(long),
		.align		= sizeof(long),
		.get		= genregs_get,
		.set		= genregs_set,
	},
};

static const struct user_regset_view user_score_native_view = {
	.name		= "score7",
	.e_machine	= EM_SCORE7,
	.regsets	= score7_regsets,
	.n		= ARRAY_SIZE(score7_regsets),
};

const struct user_regset_view *task_user_regset_view(struct task_struct *task)
{
	return &user_score_native_view;
}

static int is_16bitinsn(unsigned long insn)
{
	if ((insn & INSN32_MASK) == INSN32_MASK)
		return 0;
	else
		return 1;
}

int
read_tsk_long(struct task_struct *child,
		unsigned long addr, unsigned long *res)
{
	int copied;

	copied = access_process_vm(child, addr, res, sizeof(*res), FOLL_FORCE);

	return copied != sizeof(*res) ? -EIO : 0;
}

int
read_tsk_short(struct task_struct *child,
		unsigned long addr, unsigned short *res)
{
	int copied;

	copied = access_process_vm(child, addr, res, sizeof(*res), FOLL_FORCE);

	return copied != sizeof(*res) ? -EIO : 0;
}

static int
write_tsk_short(struct task_struct *child,
		unsigned long addr, unsigned short val)
{
	int copied;

	copied = access_process_vm(child, addr, &val, sizeof(val),
			FOLL_FORCE | FOLL_WRITE);

	return copied != sizeof(val) ? -EIO : 0;
}

static int
write_tsk_long(struct task_struct *child,
		unsigned long addr, unsigned long val)
{
	int copied;

	copied = access_process_vm(child, addr, &val, sizeof(val),
			FOLL_FORCE | FOLL_WRITE);

	return copied != sizeof(val) ? -EIO : 0;
}

void user_enable_single_step(struct task_struct *child)
{
	/* far_epc is the target of branch */
	unsigned int epc, far_epc = 0;
	unsigned long epc_insn, far_epc_insn;
	int ninsn_type;			/* next insn type 0=16b, 1=32b */
	unsigned int tmp, tmp2;
	struct pt_regs *regs = task_pt_regs(child);
	child->thread.single_step = 1;
	child->thread.ss_nextcnt = 1;
	epc = regs->cp0_epc;

	read_tsk_long(child, epc, &epc_insn);

	if (is_16bitinsn(epc_insn)) {
		if ((epc_insn & J16M) == J16) {
			tmp = epc_insn & 0xFFE;
			epc = (epc & 0xFFFFF000) | tmp;
		} else if ((epc_insn & B16M) == B16) {
			child->thread.ss_nextcnt = 2;
			tmp = (epc_insn & 0xFF) << 1;
			tmp = tmp << 23;
			tmp = (unsigned int)((int) tmp >> 23);
			far_epc = epc + tmp;
			epc += 2;
		} else if ((epc_insn & BR16M) == BR16) {
			child->thread.ss_nextcnt = 2;
			tmp = (epc_insn >> 4) & 0xF;
			far_epc = regs->regs[tmp];
			epc += 2;
		} else
			epc += 2;
	} else {
		if ((epc_insn & J32M) == J32) {
			tmp = epc_insn & 0x03FFFFFE;
			tmp2 = tmp & 0x7FFF;
			tmp = (((tmp >> 16) & 0x3FF) << 15) | tmp2;
			epc = (epc & 0xFFC00000) | tmp;
		} else if ((epc_insn & B32M) == B32) {
			child->thread.ss_nextcnt = 2;
			tmp = epc_insn & 0x03FFFFFE;	/* discard LK bit */
			tmp2 = tmp & 0x3FF;
			tmp = (((tmp >> 16) & 0x3FF) << 10) | tmp2; /* 20bit */
			tmp = tmp << 12;
			tmp = (unsigned int)((int) tmp >> 12);
			far_epc = epc + tmp;
			epc += 4;
		} else if ((epc_insn & BR32M) == BR32) {
			child->thread.ss_nextcnt = 2;
			tmp = (epc_insn >> 16) & 0x1F;
			far_epc = regs->regs[tmp];
			epc += 4;
		} else
			epc += 4;
	}

	if (child->thread.ss_nextcnt == 1) {
		read_tsk_long(child, epc, &epc_insn);

		if (is_16bitinsn(epc_insn)) {
			write_tsk_short(child, epc, SINGLESTEP16_INSN);
			ninsn_type = 0;
		} else {
			write_tsk_long(child, epc, SINGLESTEP32_INSN);
			ninsn_type = 1;
		}

		if (ninsn_type == 0) {  /* 16bits */
			child->thread.insn1_type = 0;
			child->thread.addr1 = epc;
			 /* the insn may have 32bit data */
			child->thread.insn1 = (short)epc_insn;
		} else {
			child->thread.insn1_type = 1;
			child->thread.addr1 = epc;
			child->thread.insn1 = epc_insn;
		}
	} else {
		/* branch! have two target child->thread.ss_nextcnt=2 */
		read_tsk_long(child, epc, &epc_insn);
		read_tsk_long(child, far_epc, &far_epc_insn);
		if (is_16bitinsn(epc_insn)) {
			write_tsk_short(child, epc, SINGLESTEP16_INSN);
			ninsn_type = 0;
		} else {
			write_tsk_long(child, epc, SINGLESTEP32_INSN);
			ninsn_type = 1;
		}

		if (ninsn_type == 0) {  /* 16bits */
			child->thread.insn1_type = 0;
			child->thread.addr1 = epc;
			 /* the insn may have 32bit data */
			child->thread.insn1 = (short)epc_insn;
		} else {
			child->thread.insn1_type = 1;
			child->thread.addr1 = epc;
			child->thread.insn1 = epc_insn;
		}

		if (is_16bitinsn(far_epc_insn)) {
			write_tsk_short(child, far_epc, SINGLESTEP16_INSN);
			ninsn_type = 0;
		} else {
			write_tsk_long(child, far_epc, SINGLESTEP32_INSN);
			ninsn_type = 1;
		}

		if (ninsn_type == 0) {  /* 16bits */
			child->thread.insn2_type = 0;
			child->thread.addr2 = far_epc;
			 /* the insn may have 32bit data */
			child->thread.insn2 = (short)far_epc_insn;
		} else {
			child->thread.insn2_type = 1;
			child->thread.addr2 = far_epc;
			child->thread.insn2 = far_epc_insn;
		}
	}
}

void user_disable_single_step(struct task_struct *child)
{
	if (child->thread.insn1_type == 0)
		write_tsk_short(child, child->thread.addr1,
				child->thread.insn1);

	if (child->thread.insn1_type == 1)
		write_tsk_long(child, child->thread.addr1,
				child->thread.insn1);

	if (child->thread.ss_nextcnt == 2) {	/* branch */
		if (child->thread.insn1_type == 0)
			write_tsk_short(child, child->thread.addr1,
					child->thread.insn1);
		if (child->thread.insn1_type == 1)
			write_tsk_long(child, child->thread.addr1,
					child->thread.insn1);
		if (child->thread.insn2_type == 0)
			write_tsk_short(child, child->thread.addr2,
					child->thread.insn2);
		if (child->thread.insn2_type == 1)
			write_tsk_long(child, child->thread.addr2,
					child->thread.insn2);
	}

	child->thread.single_step = 0;
	child->thread.ss_nextcnt = 0;
}

void ptrace_disable(struct task_struct *child)
{
	user_disable_single_step(child);
}

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

	switch (request) {
	case PTRACE_GETREGS:
		ret = copy_regset_to_user(child, &user_score_native_view,
						REGSET_GENERAL,
						0, sizeof(struct pt_regs),
						datap);
		break;

	case PTRACE_SETREGS:
		ret = copy_regset_from_user(child, &user_score_native_view,
						REGSET_GENERAL,
						0, sizeof(struct pt_regs),
						datap);
		break;

	default:
		ret = ptrace_request(child, request, addr, data);
		break;
	}

	return ret;
}

/*
 * Notification of system call entry/exit
 * - triggered by current->work.syscall_trace
 */
asmlinkage void do_syscall_trace(struct pt_regs *regs, int entryexit)
{
	if (!(current->ptrace & PT_PTRACED))
		return;

	if (!test_thread_flag(TIF_SYSCALL_TRACE))
		return;

	/* The 0x80 provides a way for the tracing parent to distinguish
	   between a syscall stop and SIGTRAP delivery. */
	ptrace_notify(SIGTRAP | ((current->ptrace & PT_TRACESYSGOOD) ?
			0x80 : 0));

	/*
	 * this isn't the same as continuing with a signal, but it will do
	 * for normal use.  strace only continues with a signal if the
	 * stopping signal is not SIGTRAP.  -brl
	 */
	if (current->exit_code) {
		send_sig(current->exit_code, current, 1);
		current->exit_code = 0;
	}
}
Commit	Line	Data
6bc9a396 CL	1	/*
	2	* arch/score/kernel/ptrace.c
	3	*
	4	* Score Processor version.
	5	*
	6	* Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
	7	* Chen Liqin <[email protected]>
	8	* Lennox Wu <[email protected]>
	9	*
	10	* This program is free software; you can redistribute it and/or modify
	11	* it under the terms of the GNU General Public License as published by
	12	* the Free Software Foundation; either version 2 of the License, or
	13	* (at your option) any later version.
	14	*
	15	* This program is distributed in the hope that it will be useful,
	16	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	17	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	18	* GNU General Public License for more details.
	19	*
	20	* You should have received a copy of the GNU General Public License
	21	* along with this program; if not, see the file COPYING, or write
	22	* to the Free Software Foundation, Inc.,
	23	* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	24	*/
	25
798983b2	26	#include <linux/elf.h>
6bc9a396	27	#include <linux/kernel.h>
798983b2	28	#include <linux/mm.h>
6bc9a396	29	#include <linux/ptrace.h>
798983b2	30	#include <linux/regset.h>
68db0cf1	31	#include <linux/sched/task_stack.h>
6bc9a396	32
7c0f6ba6	33	#include <linux/uaccess.h>
6bc9a396	34
798983b2 CL	35	/*
	36	* retrieve the contents of SCORE userspace general registers
	37	*/
	38	static int genregs_get(struct task_struct *target,
	39	const struct user_regset *regset,
	40	unsigned int pos, unsigned int count,
	41	void kbuf, void __user ubuf)
	42	{
	43	const struct pt_regs *regs = task_pt_regs(target);
	44	int ret;
	45
	46	/* skip 9 * sizeof(unsigned long) not use for pt_regs */
	47	ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
	48	0, offsetof(struct pt_regs, regs));
	49
	50	/* r0 - r31, cel, ceh, sr0, sr1, sr2, epc, ema, psr, ecr, condition */
	51	ret = user_regset_copyout(&pos, &count, &kbuf, &ubuf,
	52	regs->regs,
	53	offsetof(struct pt_regs, regs),
	54	offsetof(struct pt_regs, cp0_condition));
	55
	56	if (!ret)
	57	ret = user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
	58	sizeof(struct pt_regs), -1);
	59
	60	return ret;
	61	}
	62
	63	/*
	64	* update the contents of the SCORE userspace general registers
	65	*/
	66	static int genregs_set(struct task_struct *target,
	67	const struct user_regset *regset,
	68	unsigned int pos, unsigned int count,
	69	const void kbuf, const void __user ubuf)
	70	{
	71	struct pt_regs *regs = task_pt_regs(target);
	72	int ret;
	73
	74	/* skip 9 * sizeof(unsigned long) */
	75	ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
	76	0, offsetof(struct pt_regs, regs));
	77
	78	/* r0 - r31, cel, ceh, sr0, sr1, sr2, epc, ema, psr, ecr, condition */
	79	ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf,
	80	regs->regs,
	81	offsetof(struct pt_regs, regs),
	82	offsetof(struct pt_regs, cp0_condition));
	83
	84	if (!ret)
	85	ret = user_regset_copyin_ignore(&pos, &count, &kbuf, &ubuf,
	86	sizeof(struct pt_regs), -1);
	87
	88	return ret;
	89	}
	90
	91	/*
	92	* Define the register sets available on the score7 under Linux
	93	*/
	94	enum score7_regset {
	95	REGSET_GENERAL,
	96	};
	97
	98	static const struct user_regset score7_regsets[] = {
99	[REGSET_GENERAL] = {
100	.core_note_type = NT_PRSTATUS,
101	.n = ELF_NGREG,
102	.size = sizeof(long),
103	.align = sizeof(long),
104	.get = genregs_get,
105	.set = genregs_set,
106	},
107	};
108
109	static const struct user_regset_view user_score_native_view = {
110	.name = "score7",
111	.e_machine = EM_SCORE7,
112	.regsets = score7_regsets,
113	.n = ARRAY_SIZE(score7_regsets),
114	};
115
116	const struct user_regset_view task_user_regset_view(struct task_struct task)
117	{
118	return &user_score_native_view;
119	}
120
6bc9a396 CL	121	static int is_16bitinsn(unsigned long insn)
	122	{
	123	if ((insn & INSN32_MASK) == INSN32_MASK)
	124	return 0;
	125	else
	126	return 1;
	127	}
	128
	129	int
	130	read_tsk_long(struct task_struct *child,
	131	unsigned long addr, unsigned long *res)
	132	{
	133	int copied;
	134
f307ab6d	135	copied = access_process_vm(child, addr, res, sizeof(*res), FOLL_FORCE);
6bc9a396 CL	136
	137	return copied != sizeof(*res) ? -EIO : 0;
	138	}
	139
	140	int
	141	read_tsk_short(struct task_struct *child,
	142	unsigned long addr, unsigned short *res)
	143	{
	144	int copied;
	145
f307ab6d	146	copied = access_process_vm(child, addr, res, sizeof(*res), FOLL_FORCE);
6bc9a396 CL	147
	148	return copied != sizeof(*res) ? -EIO : 0;
	149	}
	150
	151	static int
	152	write_tsk_short(struct task_struct *child,
	153	unsigned long addr, unsigned short val)
	154	{
	155	int copied;
	156
f307ab6d LS	157	copied = access_process_vm(child, addr, &val, sizeof(val),
f307ab6d LS	158	FOLL_FORCE \| FOLL_WRITE);
6bc9a396 CL	159
	160	return copied != sizeof(val) ? -EIO : 0;
	161	}
	162
	163	static int
	164	write_tsk_long(struct task_struct *child,
	165	unsigned long addr, unsigned long val)
	166	{
	167	int copied;
	168
f307ab6d LS	169	copied = access_process_vm(child, addr, &val, sizeof(val),
f307ab6d LS	170	FOLL_FORCE \| FOLL_WRITE);
6bc9a396 CL	171
	172	return copied != sizeof(val) ? -EIO : 0;
	173	}
	174
0402c91a	175	void user_enable_single_step(struct task_struct *child)
6bc9a396 CL	176	{
	177	/* far_epc is the target of branch */
	178	unsigned int epc, far_epc = 0;
	179	unsigned long epc_insn, far_epc_insn;
	180	int ninsn_type; /* next insn type 0=16b, 1=32b */
	181	unsigned int tmp, tmp2;
	182	struct pt_regs *regs = task_pt_regs(child);
	183	child->thread.single_step = 1;
	184	child->thread.ss_nextcnt = 1;
	185	epc = regs->cp0_epc;
	186
	187	read_tsk_long(child, epc, &epc_insn);
	188
	189	if (is_16bitinsn(epc_insn)) {
	190	if ((epc_insn & J16M) == J16) {
	191	tmp = epc_insn & 0xFFE;
	192	epc = (epc & 0xFFFFF000) \| tmp;
	193	} else if ((epc_insn & B16M) == B16) {
	194	child->thread.ss_nextcnt = 2;
	195	tmp = (epc_insn & 0xFF) << 1;
	196	tmp = tmp << 23;
	197	tmp = (unsigned int)((int) tmp >> 23);
	198	far_epc = epc + tmp;
	199	epc += 2;
	200	} else if ((epc_insn & BR16M) == BR16) {
	201	child->thread.ss_nextcnt = 2;
	202	tmp = (epc_insn >> 4) & 0xF;
	203	far_epc = regs->regs[tmp];
	204	epc += 2;
	205	} else
	206	epc += 2;
	207	} else {
	208	if ((epc_insn & J32M) == J32) {
	209	tmp = epc_insn & 0x03FFFFFE;
	210	tmp2 = tmp & 0x7FFF;
	211	tmp = (((tmp >> 16) & 0x3FF) << 15) \| tmp2;
	212	epc = (epc & 0xFFC00000) \| tmp;
	213	} else if ((epc_insn & B32M) == B32) {
	214	child->thread.ss_nextcnt = 2;
	215	tmp = epc_insn & 0x03FFFFFE; /* discard LK bit */
	216	tmp2 = tmp & 0x3FF;
	217	tmp = (((tmp >> 16) & 0x3FF) << 10) \| tmp2; /* 20bit */
	218	tmp = tmp << 12;
	219	tmp = (unsigned int)((int) tmp >> 12);
	220	far_epc = epc + tmp;
	221	epc += 4;
	222	} else if ((epc_insn & BR32M) == BR32) {
	223	child->thread.ss_nextcnt = 2;
	224	tmp = (epc_insn >> 16) & 0x1F;
	225	far_epc = regs->regs[tmp];
	226	epc += 4;
	227	} else
	228	epc += 4;
	229	}
	230
	231	if (child->thread.ss_nextcnt == 1) {
	232	read_tsk_long(child, epc, &epc_insn);
	233
	234	if (is_16bitinsn(epc_insn)) {
	235	write_tsk_short(child, epc, SINGLESTEP16_INSN);
	236	ninsn_type = 0;
	237	} else {
	238	write_tsk_long(child, epc, SINGLESTEP32_INSN);
	239	ninsn_type = 1;
240	}
241
242	if (ninsn_type == 0) { /* 16bits */
243	child->thread.insn1_type = 0;
244	child->thread.addr1 = epc;
245	/* the insn may have 32bit data */
246	child->thread.insn1 = (short)epc_insn;
247	} else {
248	child->thread.insn1_type = 1;
249	child->thread.addr1 = epc;
250	child->thread.insn1 = epc_insn;
251	}
252	} else {
253	/* branch! have two target child->thread.ss_nextcnt=2 */
254	read_tsk_long(child, epc, &epc_insn);
255	read_tsk_long(child, far_epc, &far_epc_insn);
256	if (is_16bitinsn(epc_insn)) {
257	write_tsk_short(child, epc, SINGLESTEP16_INSN);
258	ninsn_type = 0;
259	} else {
260	write_tsk_long(child, epc, SINGLESTEP32_INSN);
261	ninsn_type = 1;
262	}
263
264	if (ninsn_type == 0) { /* 16bits */
265	child->thread.insn1_type = 0;
266	child->thread.addr1 = epc;
267	/* the insn may have 32bit data */
268	child->thread.insn1 = (short)epc_insn;
269	} else {
270	child->thread.insn1_type = 1;
271	child->thread.addr1 = epc;
272	child->thread.insn1 = epc_insn;
273	}
274
275	if (is_16bitinsn(far_epc_insn)) {
276	write_tsk_short(child, far_epc, SINGLESTEP16_INSN);
277	ninsn_type = 0;
278	} else {
279	write_tsk_long(child, far_epc, SINGLESTEP32_INSN);
280	ninsn_type = 1;
281	}
282
283	if (ninsn_type == 0) { /* 16bits */
284	child->thread.insn2_type = 0;
285	child->thread.addr2 = far_epc;
286	/* the insn may have 32bit data */
287	child->thread.insn2 = (short)far_epc_insn;
288	} else {
289	child->thread.insn2_type = 1;
290	child->thread.addr2 = far_epc;
291	child->thread.insn2 = far_epc_insn;
292	}
293	}
294	}
295
0402c91a	296	void user_disable_single_step(struct task_struct *child)
6bc9a396 CL	297	{
	298	if (child->thread.insn1_type == 0)
	299	write_tsk_short(child, child->thread.addr1,
	300	child->thread.insn1);
	301
	302	if (child->thread.insn1_type == 1)
	303	write_tsk_long(child, child->thread.addr1,
	304	child->thread.insn1);
	305
	306	if (child->thread.ss_nextcnt == 2) { /* branch */
	307	if (child->thread.insn1_type == 0)
	308	write_tsk_short(child, child->thread.addr1,
	309	child->thread.insn1);
	310	if (child->thread.insn1_type == 1)
	311	write_tsk_long(child, child->thread.addr1,
	312	child->thread.insn1);
	313	if (child->thread.insn2_type == 0)
	314	write_tsk_short(child, child->thread.addr2,
	315	child->thread.insn2);
	316	if (child->thread.insn2_type == 1)
	317	write_tsk_long(child, child->thread.addr2,
	318	child->thread.insn2);
	319	}
	320
	321	child->thread.single_step = 0;
	322	child->thread.ss_nextcnt = 0;
	323	}
	324
0402c91a CL	325	void ptrace_disable(struct task_struct *child)
	326	{
	327	user_disable_single_step(child);
	328	}
6bc9a396 CL	329
6bc9a396 CL	330	long
9b05a69e NK	331	arch_ptrace(struct task_struct *child, long request,
9b05a69e NK	332	unsigned long addr, unsigned long data)
6bc9a396 CL	333	{
6bc9a396 CL	334	int ret;
a1f8213b	335	unsigned long __user datap = (void __user )data;
6bc9a396	336
6bc9a396	337	switch (request) {
0402c91a	338	case PTRACE_GETREGS:
798983b2 CL	339	ret = copy_regset_to_user(child, &user_score_native_view,
	340	REGSET_GENERAL,
	341	0, sizeof(struct pt_regs),
41a2437e	342	datap);
6bc9a396 CL	343	break;
6bc9a396 CL	344
0402c91a	345	case PTRACE_SETREGS:
798983b2 CL	346	ret = copy_regset_from_user(child, &user_score_native_view,
	347	REGSET_GENERAL,
	348	0, sizeof(struct pt_regs),
41a2437e	349	datap);
6bc9a396 CL	350	break;
	351
	352	default:
0402c91a	353	ret = ptrace_request(child, request, addr, data);
6bc9a396 CL	354	break;
	355	}
	356
	357	return ret;
	358	}
	359
	360	/*
	361	* Notification of system call entry/exit
	362	* - triggered by current->work.syscall_trace
	363	*/
	364	asmlinkage void do_syscall_trace(struct pt_regs *regs, int entryexit)
	365	{
	366	if (!(current->ptrace & PT_PTRACED))
	367	return;
	368
	369	if (!test_thread_flag(TIF_SYSCALL_TRACE))
	370	return;
	371
	372	/* The 0x80 provides a way for the tracing parent to distinguish
	373	between a syscall stop and SIGTRAP delivery. */
	374	ptrace_notify(SIGTRAP \| ((current->ptrace & PT_TRACESYSGOOD) ?
	375	0x80 : 0));
	376
	377	/*
	378	* this isn't the same as continuing with a signal, but it will do
	379	* for normal use. strace only continues with a signal if the
	380	* stopping signal is not SIGTRAP. -brl
	381	*/
	382	if (current->exit_code) {
	383	send_sig(current->exit_code, current, 1);
	384	current->exit_code = 0;
	385	}
	386	}