[linux-2.6-block.git] / arch / score / kernel / ptrace.c

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