[net-next-2.6.git] / arch / xtensa / kernel / ptrace.c

// TODO some minor issues
/*
 * 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.
 *
 * Copyright (C) 2001 - 2007  Tensilica Inc.
 *
 * Joe Taylor	<joe@tensilica.com, joetylr@yahoo.com>
 * Chris Zankel <chris@zankel.net>
 * Scott Foehner<sfoehner@yahoo.com>,
 * Kevin Chea
 * Marc Gauthier<marc@tensilica.com> <marc@alumni.uwaterloo.ca>
 */

#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/errno.h>
#include <linux/ptrace.h>
#include <linux/smp.h>
#include <linux/security.h>
#include <linux/signal.h>

#include <asm/pgtable.h>
#include <asm/page.h>
#include <asm/system.h>
#include <asm/uaccess.h>
#include <asm/ptrace.h>
#include <asm/elf.h>
#include <asm/coprocessor.h>


void user_enable_single_step(struct task_struct *child)
{
	child->ptrace |= PT_SINGLESTEP;
}

void user_disable_single_step(struct task_struct *child)
{
	child->ptrace &= ~PT_SINGLESTEP;
}

/*
 * Called by kernel/ptrace.c when detaching to disable single stepping.
 */

void ptrace_disable(struct task_struct *child)
{
	/* Nothing to do.. */
}

int ptrace_getregs(struct task_struct *child, void __user *uregs)
{
	struct pt_regs *regs = task_pt_regs(child);
	xtensa_gregset_t __user *gregset = uregs;
	unsigned long wm = regs->wmask;
	unsigned long wb = regs->windowbase;
	int live, i;

	if (!access_ok(VERIFY_WRITE, uregs, sizeof(xtensa_gregset_t)))
		return -EIO;

	__put_user(regs->pc, &gregset->pc);
	__put_user(regs->ps & ~(1 << PS_EXCM_BIT), &gregset->ps);
	__put_user(regs->lbeg, &gregset->lbeg);
	__put_user(regs->lend, &gregset->lend);
	__put_user(regs->lcount, &gregset->lcount);
	__put_user(regs->windowstart, &gregset->windowstart);
	__put_user(regs->windowbase, &gregset->windowbase);

	live = (wm & 2) ? 4 : (wm & 4) ? 8 : (wm & 8) ? 12 : 16;

	for (i = 0; i < live; i++)
		__put_user(regs->areg[i],gregset->a+((wb*4+i)%XCHAL_NUM_AREGS));
	for (i = XCHAL_NUM_AREGS - (wm >> 4) * 4; i < XCHAL_NUM_AREGS; i++)
		__put_user(regs->areg[i],gregset->a+((wb*4+i)%XCHAL_NUM_AREGS));

	return 0;
}

int ptrace_setregs(struct task_struct *child, void __user *uregs)
{
	struct pt_regs *regs = task_pt_regs(child);
	xtensa_gregset_t *gregset = uregs;
	const unsigned long ps_mask = PS_CALLINC_MASK | PS_OWB_MASK;
	unsigned long ps;
	unsigned long wb;

	if (!access_ok(VERIFY_WRITE, uregs, sizeof(xtensa_gregset_t)))
		return -EIO;

	__get_user(regs->pc, &gregset->pc);
	__get_user(ps, &gregset->ps);
	__get_user(regs->lbeg, &gregset->lbeg);
	__get_user(regs->lend, &gregset->lend);
	__get_user(regs->lcount, &gregset->lcount);
	__get_user(regs->windowstart, &gregset->windowstart);
	__get_user(wb, &gregset->windowbase);

	regs->ps = (regs->ps & ~ps_mask) | (ps & ps_mask) | (1 << PS_EXCM_BIT);

	if (wb >= XCHAL_NUM_AREGS / 4)
		return -EFAULT;

	regs->windowbase = wb;

	if (wb != 0 &&  __copy_from_user(regs->areg + XCHAL_NUM_AREGS - wb * 4,
					 gregset->a, wb * 16))
		return -EFAULT;

	if (__copy_from_user(regs->areg, gregset->a + wb*4, (WSBITS-wb) * 16))
		return -EFAULT;

	return 0;
}


int ptrace_getxregs(struct task_struct *child, void __user *uregs)
{
	struct pt_regs *regs = task_pt_regs(child);
	struct thread_info *ti = task_thread_info(child);
	elf_xtregs_t __user *xtregs = uregs;
	int ret = 0;

	if (!access_ok(VERIFY_WRITE, uregs, sizeof(elf_xtregs_t)))
		return -EIO;

#if XTENSA_HAVE_COPROCESSORS
	/* Flush all coprocessor registers to memory. */
	coprocessor_flush_all(ti);
	ret |= __copy_to_user(&xtregs->cp0, &ti->xtregs_cp,
			      sizeof(xtregs_coprocessor_t));
#endif
	ret |= __copy_to_user(&xtregs->opt, &regs->xtregs_opt,
			      sizeof(xtregs->opt));
	ret |= __copy_to_user(&xtregs->user,&ti->xtregs_user,
			      sizeof(xtregs->user));

	return ret ? -EFAULT : 0;
}

int ptrace_setxregs(struct task_struct *child, void __user *uregs)
{
	struct thread_info *ti = task_thread_info(child);
	struct pt_regs *regs = task_pt_regs(child);
	elf_xtregs_t *xtregs = uregs;
	int ret = 0;

#if XTENSA_HAVE_COPROCESSORS
	/* Flush all coprocessors before we overwrite them. */
	coprocessor_flush_all(ti);
	coprocessor_release_all(ti);

	ret |= __copy_from_user(&ti->xtregs_cp, &xtregs->cp0, 
				sizeof(xtregs_coprocessor_t));
#endif
	ret |= __copy_from_user(&regs->xtregs_opt, &xtregs->opt,
				sizeof(xtregs->opt));
	ret |= __copy_from_user(&ti->xtregs_user, &xtregs->user,
				sizeof(xtregs->user));

	return ret ? -EFAULT : 0;
}

int ptrace_peekusr(struct task_struct *child, long regno, long __user *ret)
{
	struct pt_regs *regs;
	unsigned long tmp;

	regs = task_pt_regs(child);
	tmp = 0;  /* Default return value. */

	switch(regno) {

		case REG_AR_BASE ... REG_AR_BASE + XCHAL_NUM_AREGS - 1:
			tmp = regs->areg[regno - REG_AR_BASE];
			break;

		case REG_A_BASE ... REG_A_BASE + 15:
			tmp = regs->areg[regno - REG_A_BASE];
			break;

		case REG_PC:
			tmp = regs->pc;
			break;

		case REG_PS:
			/* Note:  PS.EXCM is not set while user task is running;
			 * its being set in regs is for exception handling
			 * convenience.  */
			tmp = (regs->ps & ~(1 << PS_EXCM_BIT));
			break;

		case REG_WB:
			break;		/* tmp = 0 */

		case REG_WS:
		{
			unsigned long wb = regs->windowbase;
			unsigned long ws = regs->windowstart;
			tmp = ((ws>>wb) | (ws<<(WSBITS-wb))) & ((1<<WSBITS)-1);
			break;
		}
		case REG_LBEG:
			tmp = regs->lbeg;
			break;

		case REG_LEND:
			tmp = regs->lend;
			break;

		case REG_LCOUNT:
			tmp = regs->lcount;
			break;

		case REG_SAR:
			tmp = regs->sar;
			break;

		case SYSCALL_NR:
			tmp = regs->syscall;
			break;

		default:
			return -EIO;
	}
	return put_user(tmp, ret);
}

int ptrace_pokeusr(struct task_struct *child, long regno, long val)
{
	struct pt_regs *regs;
	regs = task_pt_regs(child);

	switch (regno) {
		case REG_AR_BASE ... REG_AR_BASE + XCHAL_NUM_AREGS - 1:
			regs->areg[regno - REG_AR_BASE] = val;
			break;

		case REG_A_BASE ... REG_A_BASE + 15:
			regs->areg[regno - REG_A_BASE] = val;
			break;

		case REG_PC:
			regs->pc = val;
			break;

		case SYSCALL_NR:
			regs->syscall = val;
			break;

		default:
			return -EIO;
	}
	return 0;
}

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

	switch (request) {
	case PTRACE_PEEKTEXT:	/* read word at location addr. */
	case PTRACE_PEEKDATA:
		ret = generic_ptrace_peekdata(child, addr, data);
		break;

	case PTRACE_PEEKUSR:	/* read register specified by addr. */
		ret = ptrace_peekusr(child, addr, datap);
		break;

	case PTRACE_POKETEXT:	/* write the word at location addr. */
	case PTRACE_POKEDATA:
		ret = generic_ptrace_pokedata(child, addr, data);
		break;

	case PTRACE_POKEUSR:	/* write register specified by addr. */
		ret = ptrace_pokeusr(child, addr, data);
		break;

	case PTRACE_GETREGS:
		ret = ptrace_getregs(child, datap);
		break;

	case PTRACE_SETREGS:
		ret = ptrace_setregs(child, datap);
		break;

	case PTRACE_GETXTREGS:
		ret = ptrace_getxregs(child, datap);
		break;

	case PTRACE_SETXTREGS:
		ret = ptrace_setxregs(child, datap);
		break;

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

	return ret;
}

void do_syscall_trace(void)
{
	/*
	 * 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;
	}
}

void do_syscall_trace_enter(struct pt_regs *regs)
{
	if (test_thread_flag(TIF_SYSCALL_TRACE)
			&& (current->ptrace & PT_PTRACED))
		do_syscall_trace();

#if 0
	if (unlikely(current->audit_context))
		audit_syscall_entry(current, AUDIT_ARCH_XTENSA..);
#endif
}

void do_syscall_trace_leave(struct pt_regs *regs)
{
	if ((test_thread_flag(TIF_SYSCALL_TRACE))
			&& (current->ptrace & PT_PTRACED))
		do_syscall_trace();
}
Commit	Line	Data
5a0015d6 CZ	1	// TODO some minor issues
	2	/*
	3	* This file is subject to the terms and conditions of the GNU General Public
	4	* License. See the file "COPYING" in the main directory of this archive
	5	* for more details.
	6	*
c658eac6	7	* Copyright (C) 2001 - 2007 Tensilica Inc.
5a0015d6 CZ	8	*
	9	* Joe Taylor <joe@tensilica.com, joetylr@yahoo.com>
	10	* Chris Zankel <chris@zankel.net>
	11	* Scott Foehner<sfoehner@yahoo.com>,
	12	* Kevin Chea
	13	* Marc Gauthier<marc@tensilica.com> <marc@alumni.uwaterloo.ca>
	14	*/
	15
5a0015d6 CZ	16	#include <linux/kernel.h>
	17	#include <linux/sched.h>
	18	#include <linux/mm.h>
	19	#include <linux/errno.h>
	20	#include <linux/ptrace.h>
	21	#include <linux/smp.h>
5a0015d6	22	#include <linux/security.h>
0ee23b50	23	#include <linux/signal.h>
5a0015d6 CZ	24
	25	#include <asm/pgtable.h>
	26	#include <asm/page.h>
	27	#include <asm/system.h>
	28	#include <asm/uaccess.h>
	29	#include <asm/ptrace.h>
	30	#include <asm/elf.h>
c658eac6	31	#include <asm/coprocessor.h>
5a0015d6	32
6d75ca10 CH	33
	34	void user_enable_single_step(struct task_struct *child)
	35	{
	36	child->ptrace \|= PT_SINGLESTEP;
	37	}
	38
	39	void user_disable_single_step(struct task_struct *child)
	40	{
	41	child->ptrace &= ~PT_SINGLESTEP;
	42	}
	43
5a0015d6	44	/*
c658eac6	45	* Called by kernel/ptrace.c when detaching to disable single stepping.
5a0015d6 CZ	46	*/
	47
	48	void ptrace_disable(struct task_struct *child)
	49	{
	50	/* Nothing to do.. */
	51	}
	52
c658eac6	53	int ptrace_getregs(struct task_struct child, void __user uregs)
5a0015d6	54	{
c658eac6 CZ	55	struct pt_regs *regs = task_pt_regs(child);
c658eac6 CZ	56	xtensa_gregset_t __user *gregset = uregs;
c658eac6	57	unsigned long wm = regs->wmask;
42086cec CZ	58	unsigned long wb = regs->windowbase;
42086cec CZ	59	int live, i;
c658eac6 CZ	60
	61	if (!access_ok(VERIFY_WRITE, uregs, sizeof(xtensa_gregset_t)))
	62	return -EIO;
	63
42086cec CZ	64	__put_user(regs->pc, &gregset->pc);
	65	__put_user(regs->ps & ~(1 << PS_EXCM_BIT), &gregset->ps);
	66	__put_user(regs->lbeg, &gregset->lbeg);
	67	__put_user(regs->lend, &gregset->lend);
	68	__put_user(regs->lcount, &gregset->lcount);
	69	__put_user(regs->windowstart, &gregset->windowstart);
	70	__put_user(regs->windowbase, &gregset->windowbase);
c658eac6 CZ	71
c658eac6 CZ	72	live = (wm & 2) ? 4 : (wm & 4) ? 8 : (wm & 8) ? 12 : 16;
c658eac6	73
42086cec CZ	74	for (i = 0; i < live; i++)
	75	__put_user(regs->areg[i],gregset->a+((wb*4+i)%XCHAL_NUM_AREGS));
	76	for (i = XCHAL_NUM_AREGS - (wm >> 4) * 4; i < XCHAL_NUM_AREGS; i++)
	77	__put_user(regs->areg[i],gregset->a+((wb*4+i)%XCHAL_NUM_AREGS));
	78
	79	return 0;
c658eac6	80	}
5a0015d6	81
c658eac6 CZ	82	int ptrace_setregs(struct task_struct child, void __user uregs)
	83	{
	84	struct pt_regs *regs = task_pt_regs(child);
	85	xtensa_gregset_t *gregset = uregs;
	86	const unsigned long ps_mask = PS_CALLINC_MASK \| PS_OWB_MASK;
c658eac6	87	unsigned long ps;
42086cec	88	unsigned long wb;
c658eac6 CZ	89
	90	if (!access_ok(VERIFY_WRITE, uregs, sizeof(xtensa_gregset_t)))
	91	return -EIO;
	92
42086cec CZ	93	__get_user(regs->pc, &gregset->pc);
	94	__get_user(ps, &gregset->ps);
	95	__get_user(regs->lbeg, &gregset->lbeg);
	96	__get_user(regs->lend, &gregset->lend);
	97	__get_user(regs->lcount, &gregset->lcount);
	98	__get_user(regs->windowstart, &gregset->windowstart);
	99	__get_user(wb, &gregset->windowbase);
c658eac6 CZ	100
	101	regs->ps = (regs->ps & ~ps_mask) \| (ps & ps_mask) \| (1 << PS_EXCM_BIT);
	102
42086cec CZ	103	if (wb >= XCHAL_NUM_AREGS / 4)
42086cec CZ	104	return -EFAULT;
c658eac6	105
42086cec CZ	106	regs->windowbase = wb;
	107
	108	if (wb != 0 && __copy_from_user(regs->areg + XCHAL_NUM_AREGS - wb * 4,
	109	gregset->a, wb * 16))
	110	return -EFAULT;
	111
	112	if (__copy_from_user(regs->areg, gregset->a + wb4, (WSBITS-wb) 16))
	113	return -EFAULT;
	114
	115	return 0;
c658eac6	116	}
5a0015d6	117
5a0015d6	118
c658eac6 CZ	119	int ptrace_getxregs(struct task_struct child, void __user uregs)
	120	{
	121	struct pt_regs *regs = task_pt_regs(child);
	122	struct thread_info *ti = task_thread_info(child);
	123	elf_xtregs_t __user *xtregs = uregs;
	124	int ret = 0;
	125
	126	if (!access_ok(VERIFY_WRITE, uregs, sizeof(elf_xtregs_t)))
	127	return -EIO;
	128
	129	#if XTENSA_HAVE_COPROCESSORS
	130	/* Flush all coprocessor registers to memory. */
	131	coprocessor_flush_all(ti);
	132	ret \|= __copy_to_user(&xtregs->cp0, &ti->xtregs_cp,
	133	sizeof(xtregs_coprocessor_t));
	134	#endif
	135	ret \|= __copy_to_user(&xtregs->opt, &regs->xtregs_opt,
	136	sizeof(xtregs->opt));
	137	ret \|= __copy_to_user(&xtregs->user,&ti->xtregs_user,
	138	sizeof(xtregs->user));
5a0015d6	139
c658eac6 CZ	140	return ret ? -EFAULT : 0;
	141	}
	142
	143	int ptrace_setxregs(struct task_struct child, void __user uregs)
	144	{
	145	struct thread_info *ti = task_thread_info(child);
	146	struct pt_regs *regs = task_pt_regs(child);
	147	elf_xtregs_t *xtregs = uregs;
	148	int ret = 0;
	149
	150	#if XTENSA_HAVE_COPROCESSORS
	151	/* Flush all coprocessors before we overwrite them. */
	152	coprocessor_flush_all(ti);
	153	coprocessor_release_all(ti);
	154
	155	ret \|= __copy_from_user(&ti->xtregs_cp, &xtregs->cp0,
	156	sizeof(xtregs_coprocessor_t));
	157	#endif
	158	ret \|= __copy_from_user(&regs->xtregs_opt, &xtregs->opt,
	159	sizeof(xtregs->opt));
	160	ret \|= __copy_from_user(&ti->xtregs_user, &xtregs->user,
	161	sizeof(xtregs->user));
	162
	163	return ret ? -EFAULT : 0;
	164	}
	165
	166	int ptrace_peekusr(struct task_struct child, long regno, long __user ret)
	167	{
	168	struct pt_regs *regs;
	169	unsigned long tmp;
	170
	171	regs = task_pt_regs(child);
	172	tmp = 0; /* Default return value. */
5a0015d6	173
c658eac6	174	switch(regno) {
5a0015d6 CZ	175
5a0015d6 CZ	176	case REG_AR_BASE ... REG_AR_BASE + XCHAL_NUM_AREGS - 1:
c658eac6	177	tmp = regs->areg[regno - REG_AR_BASE];
5a0015d6	178	break;
c658eac6	179
5a0015d6	180	case REG_A_BASE ... REG_A_BASE + 15:
c658eac6	181	tmp = regs->areg[regno - REG_A_BASE];
5a0015d6	182	break;
c658eac6	183
5a0015d6 CZ	184	case REG_PC:
	185	tmp = regs->pc;
	186	break;
c658eac6	187
5a0015d6 CZ	188	case REG_PS:
	189	/* Note: PS.EXCM is not set while user task is running;
	190	* its being set in regs is for exception handling
	191	* convenience. */
173d6681	192	tmp = (regs->ps & ~(1 << PS_EXCM_BIT));
5a0015d6	193	break;
c658eac6	194
5a0015d6	195	case REG_WB:
c658eac6 CZ	196	break; /* tmp = 0 */
c658eac6 CZ	197
5a0015d6	198	case REG_WS:
c658eac6 CZ	199	{
	200	unsigned long wb = regs->windowbase;
	201	unsigned long ws = regs->windowstart;
	202	tmp = ((ws>>wb) \| (ws<<(WSBITS-wb))) & ((1<<WSBITS)-1);
5a0015d6	203	break;
c658eac6	204	}
5a0015d6 CZ	205	case REG_LBEG:
	206	tmp = regs->lbeg;
	207	break;
c658eac6	208
5a0015d6 CZ	209	case REG_LEND:
	210	tmp = regs->lend;
	211	break;
c658eac6	212
5a0015d6 CZ	213	case REG_LCOUNT:
	214	tmp = regs->lcount;
	215	break;
c658eac6	216
5a0015d6 CZ	217	case REG_SAR:
	218	tmp = regs->sar;
	219	break;
c658eac6	220
5a0015d6 CZ	221	case SYSCALL_NR:
	222	tmp = regs->syscall;
	223	break;
5a0015d6	224
c658eac6 CZ	225	default:
	226	return -EIO;
	227	}
	228	return put_user(tmp, ret);
	229	}
5a0015d6	230
c658eac6 CZ	231	int ptrace_pokeusr(struct task_struct *child, long regno, long val)
	232	{
	233	struct pt_regs *regs;
	234	regs = task_pt_regs(child);
5a0015d6	235
c658eac6	236	switch (regno) {
5a0015d6	237	case REG_AR_BASE ... REG_AR_BASE + XCHAL_NUM_AREGS - 1:
c658eac6	238	regs->areg[regno - REG_AR_BASE] = val;
5a0015d6	239	break;
c658eac6	240
5a0015d6	241	case REG_A_BASE ... REG_A_BASE + 15:
c658eac6	242	regs->areg[regno - REG_A_BASE] = val;
5a0015d6	243	break;
c658eac6	244
5a0015d6	245	case REG_PC:
c658eac6	246	regs->pc = val;
5a0015d6	247	break;
c658eac6	248
5a0015d6	249	case SYSCALL_NR:
c658eac6	250	regs->syscall = val;
5a0015d6	251	break;
5a0015d6 CZ	252
5a0015d6 CZ	253	default:
c658eac6 CZ	254	return -EIO;
	255	}
	256	return 0;
	257	}
	258
9b05a69e NK	259	long arch_ptrace(struct task_struct *child, long request,
9b05a69e NK	260	unsigned long addr, unsigned long data)
c658eac6 CZ	261	{
c658eac6 CZ	262	int ret = -EPERM;
5ef45079	263	void __user datap = (void __user ) data;
c658eac6 CZ	264
	265	switch (request) {
	266	case PTRACE_PEEKTEXT: /* read word at location addr. */
	267	case PTRACE_PEEKDATA:
	268	ret = generic_ptrace_peekdata(child, addr, data);
	269	break;
	270
	271	case PTRACE_PEEKUSR: /* read register specified by addr. */
5ef45079	272	ret = ptrace_peekusr(child, addr, datap);
c658eac6 CZ	273	break;
	274
	275	case PTRACE_POKETEXT: /* write the word at location addr. */
	276	case PTRACE_POKEDATA:
	277	ret = generic_ptrace_pokedata(child, addr, data);
	278	break;
	279
	280	case PTRACE_POKEUSR: /* write register specified by addr. */
	281	ret = ptrace_pokeusr(child, addr, data);
5a0015d6	282	break;
5a0015d6	283
5a0015d6	284	case PTRACE_GETREGS:
5ef45079	285	ret = ptrace_getregs(child, datap);
5a0015d6	286	break;
5a0015d6 CZ	287
5a0015d6 CZ	288	case PTRACE_SETREGS:
5ef45079	289	ret = ptrace_setregs(child, datap);
5a0015d6	290	break;
5a0015d6	291
c658eac6	292	case PTRACE_GETXTREGS:
5ef45079	293	ret = ptrace_getxregs(child, datap);
5a0015d6	294	break;
5a0015d6	295
c658eac6	296	case PTRACE_SETXTREGS:
5ef45079	297	ret = ptrace_setxregs(child, datap);
5a0015d6 CZ	298	break;
5a0015d6 CZ	299
5a0015d6 CZ	300	default:
5a0015d6 CZ	301	ret = ptrace_request(child, request, addr, data);
c658eac6	302	break;
5a0015d6	303	}
c658eac6	304
5a0015d6 CZ	305	return ret;
	306	}
	307
	308	void do_syscall_trace(void)
	309	{
5a0015d6 CZ	310	/*
	311	* The 0x80 provides a way for the tracing parent to distinguish
	312	* between a syscall stop and SIGTRAP delivery
	313	*/
	314	ptrace_notify(SIGTRAP\|((current->ptrace & PT_TRACESYSGOOD) ? 0x80 : 0));
	315
	316	/*
	317	* this isn't the same as continuing with a signal, but it will do
	318	* for normal use. strace only continues with a signal if the
	319	* stopping signal is not SIGTRAP. -brl
	320	*/
	321	if (current->exit_code) {
	322	send_sig(current->exit_code, current, 1);
	323	current->exit_code = 0;
	324	}
	325	}
fc4fb2ad CZ	326
	327	void do_syscall_trace_enter(struct pt_regs *regs)
	328	{
	329	if (test_thread_flag(TIF_SYSCALL_TRACE)
	330	&& (current->ptrace & PT_PTRACED))
	331	do_syscall_trace();
	332
	333	#if 0
	334	if (unlikely(current->audit_context))
	335	audit_syscall_entry(current, AUDIT_ARCH_XTENSA..);
	336	#endif
	337	}
	338
	339	void do_syscall_trace_leave(struct pt_regs *regs)
	340	{
	341	if ((test_thread_flag(TIF_SYSCALL_TRACE))
	342	&& (current->ptrace & PT_PTRACED))
	343	do_syscall_trace();
	344	}
	345