[deliverable/linux.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/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 (!access_ok(VERIFY_READ, uregs, sizeof(elf_xtregs_t)))
		return -EFAULT;

#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
	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>
5a0015d6 CZ	27	#include <asm/uaccess.h>
	28	#include <asm/ptrace.h>
	29	#include <asm/elf.h>
c658eac6	30	#include <asm/coprocessor.h>
5a0015d6	31
6d75ca10 CH	32
	33	void user_enable_single_step(struct task_struct *child)
	34	{
	35	child->ptrace \|= PT_SINGLESTEP;
	36	}
	37
	38	void user_disable_single_step(struct task_struct *child)
	39	{
	40	child->ptrace &= ~PT_SINGLESTEP;
	41	}
	42
5a0015d6	43	/*
c658eac6	44	* Called by kernel/ptrace.c when detaching to disable single stepping.
5a0015d6 CZ	45	*/
	46
	47	void ptrace_disable(struct task_struct *child)
	48	{
	49	/* Nothing to do.. */
	50	}
	51
c658eac6	52	int ptrace_getregs(struct task_struct child, void __user uregs)
5a0015d6	53	{
c658eac6 CZ	54	struct pt_regs *regs = task_pt_regs(child);
c658eac6 CZ	55	xtensa_gregset_t __user *gregset = uregs;
c658eac6	56	unsigned long wm = regs->wmask;
42086cec CZ	57	unsigned long wb = regs->windowbase;
42086cec CZ	58	int live, i;
c658eac6 CZ	59
	60	if (!access_ok(VERIFY_WRITE, uregs, sizeof(xtensa_gregset_t)))
	61	return -EIO;
	62
42086cec CZ	63	__put_user(regs->pc, &gregset->pc);
	64	__put_user(regs->ps & ~(1 << PS_EXCM_BIT), &gregset->ps);
	65	__put_user(regs->lbeg, &gregset->lbeg);
	66	__put_user(regs->lend, &gregset->lend);
	67	__put_user(regs->lcount, &gregset->lcount);
	68	__put_user(regs->windowstart, &gregset->windowstart);
	69	__put_user(regs->windowbase, &gregset->windowbase);
c658eac6 CZ	70
c658eac6 CZ	71	live = (wm & 2) ? 4 : (wm & 4) ? 8 : (wm & 8) ? 12 : 16;
c658eac6	72
42086cec CZ	73	for (i = 0; i < live; i++)
	74	__put_user(regs->areg[i],gregset->a+((wb*4+i)%XCHAL_NUM_AREGS));
	75	for (i = XCHAL_NUM_AREGS - (wm >> 4) * 4; i < XCHAL_NUM_AREGS; i++)
	76	__put_user(regs->areg[i],gregset->a+((wb*4+i)%XCHAL_NUM_AREGS));
	77
	78	return 0;
c658eac6	79	}
5a0015d6	80
c658eac6 CZ	81	int ptrace_setregs(struct task_struct child, void __user uregs)
	82	{
	83	struct pt_regs *regs = task_pt_regs(child);
	84	xtensa_gregset_t *gregset = uregs;
	85	const unsigned long ps_mask = PS_CALLINC_MASK \| PS_OWB_MASK;
c658eac6	86	unsigned long ps;
42086cec	87	unsigned long wb;
c658eac6 CZ	88
	89	if (!access_ok(VERIFY_WRITE, uregs, sizeof(xtensa_gregset_t)))
	90	return -EIO;
	91
42086cec CZ	92	__get_user(regs->pc, &gregset->pc);
	93	__get_user(ps, &gregset->ps);
	94	__get_user(regs->lbeg, &gregset->lbeg);
	95	__get_user(regs->lend, &gregset->lend);
	96	__get_user(regs->lcount, &gregset->lcount);
	97	__get_user(regs->windowstart, &gregset->windowstart);
	98	__get_user(wb, &gregset->windowbase);
c658eac6 CZ	99
	100	regs->ps = (regs->ps & ~ps_mask) \| (ps & ps_mask) \| (1 << PS_EXCM_BIT);
	101
42086cec CZ	102	if (wb >= XCHAL_NUM_AREGS / 4)
42086cec CZ	103	return -EFAULT;
c658eac6	104
42086cec CZ	105	regs->windowbase = wb;
	106
	107	if (wb != 0 && __copy_from_user(regs->areg + XCHAL_NUM_AREGS - wb * 4,
	108	gregset->a, wb * 16))
	109	return -EFAULT;
	110
	111	if (__copy_from_user(regs->areg, gregset->a + wb4, (WSBITS-wb) 16))
	112	return -EFAULT;
	113
	114	return 0;
c658eac6	115	}
5a0015d6	116
5a0015d6	117
c658eac6 CZ	118	int ptrace_getxregs(struct task_struct child, void __user uregs)
	119	{
	120	struct pt_regs *regs = task_pt_regs(child);
	121	struct thread_info *ti = task_thread_info(child);
	122	elf_xtregs_t __user *xtregs = uregs;
	123	int ret = 0;
	124
	125	if (!access_ok(VERIFY_WRITE, uregs, sizeof(elf_xtregs_t)))
	126	return -EIO;
	127
	128	#if XTENSA_HAVE_COPROCESSORS
	129	/* Flush all coprocessor registers to memory. */
	130	coprocessor_flush_all(ti);
	131	ret \|= __copy_to_user(&xtregs->cp0, &ti->xtregs_cp,
	132	sizeof(xtregs_coprocessor_t));
	133	#endif
	134	ret \|= __copy_to_user(&xtregs->opt, &regs->xtregs_opt,
	135	sizeof(xtregs->opt));
	136	ret \|= __copy_to_user(&xtregs->user,&ti->xtregs_user,
	137	sizeof(xtregs->user));
5a0015d6	138
c658eac6 CZ	139	return ret ? -EFAULT : 0;
	140	}
	141
	142	int ptrace_setxregs(struct task_struct child, void __user uregs)
	143	{
	144	struct thread_info *ti = task_thread_info(child);
	145	struct pt_regs *regs = task_pt_regs(child);
	146	elf_xtregs_t *xtregs = uregs;
	147	int ret = 0;
	148
0d0138eb DR	149	if (!access_ok(VERIFY_READ, uregs, sizeof(elf_xtregs_t)))
	150	return -EFAULT;
	151
c658eac6 CZ	152	#if XTENSA_HAVE_COPROCESSORS
	153	/* Flush all coprocessors before we overwrite them. */
	154	coprocessor_flush_all(ti);
	155	coprocessor_release_all(ti);
	156
	157	ret \|= __copy_from_user(&ti->xtregs_cp, &xtregs->cp0,
	158	sizeof(xtregs_coprocessor_t));
	159	#endif
	160	ret \|= __copy_from_user(&regs->xtregs_opt, &xtregs->opt,
	161	sizeof(xtregs->opt));
	162	ret \|= __copy_from_user(&ti->xtregs_user, &xtregs->user,
	163	sizeof(xtregs->user));
	164
	165	return ret ? -EFAULT : 0;
	166	}
	167
	168	int ptrace_peekusr(struct task_struct child, long regno, long __user ret)
	169	{
	170	struct pt_regs *regs;
	171	unsigned long tmp;
	172
	173	regs = task_pt_regs(child);
	174	tmp = 0; /* Default return value. */
5a0015d6	175
c658eac6	176	switch(regno) {
5a0015d6 CZ	177
5a0015d6 CZ	178	case REG_AR_BASE ... REG_AR_BASE + XCHAL_NUM_AREGS - 1:
c658eac6	179	tmp = regs->areg[regno - REG_AR_BASE];
5a0015d6	180	break;
c658eac6	181
5a0015d6	182	case REG_A_BASE ... REG_A_BASE + 15:
c658eac6	183	tmp = regs->areg[regno - REG_A_BASE];
5a0015d6	184	break;
c658eac6	185
5a0015d6 CZ	186	case REG_PC:
	187	tmp = regs->pc;
	188	break;
c658eac6	189
5a0015d6 CZ	190	case REG_PS:
	191	/* Note: PS.EXCM is not set while user task is running;
	192	* its being set in regs is for exception handling
	193	* convenience. */
173d6681	194	tmp = (regs->ps & ~(1 << PS_EXCM_BIT));
5a0015d6	195	break;
c658eac6	196
5a0015d6	197	case REG_WB:
c658eac6 CZ	198	break; /* tmp = 0 */
c658eac6 CZ	199
5a0015d6	200	case REG_WS:
c658eac6 CZ	201	{
	202	unsigned long wb = regs->windowbase;
	203	unsigned long ws = regs->windowstart;
	204	tmp = ((ws>>wb) \| (ws<<(WSBITS-wb))) & ((1<<WSBITS)-1);
5a0015d6	205	break;
c658eac6	206	}
5a0015d6 CZ	207	case REG_LBEG:
	208	tmp = regs->lbeg;
	209	break;
c658eac6	210
5a0015d6 CZ	211	case REG_LEND:
	212	tmp = regs->lend;
	213	break;
c658eac6	214
5a0015d6 CZ	215	case REG_LCOUNT:
	216	tmp = regs->lcount;
	217	break;
c658eac6	218
5a0015d6 CZ	219	case REG_SAR:
	220	tmp = regs->sar;
	221	break;
c658eac6	222
5a0015d6 CZ	223	case SYSCALL_NR:
	224	tmp = regs->syscall;
	225	break;
5a0015d6	226
c658eac6 CZ	227	default:
	228	return -EIO;
	229	}
	230	return put_user(tmp, ret);
	231	}
5a0015d6	232
c658eac6 CZ	233	int ptrace_pokeusr(struct task_struct *child, long regno, long val)
	234	{
	235	struct pt_regs *regs;
	236	regs = task_pt_regs(child);
5a0015d6	237
c658eac6	238	switch (regno) {
5a0015d6	239	case REG_AR_BASE ... REG_AR_BASE + XCHAL_NUM_AREGS - 1:
c658eac6	240	regs->areg[regno - REG_AR_BASE] = val;
5a0015d6	241	break;
c658eac6	242
5a0015d6	243	case REG_A_BASE ... REG_A_BASE + 15:
c658eac6	244	regs->areg[regno - REG_A_BASE] = val;
5a0015d6	245	break;
c658eac6	246
5a0015d6	247	case REG_PC:
c658eac6	248	regs->pc = val;
5a0015d6	249	break;
c658eac6	250
5a0015d6	251	case SYSCALL_NR:
c658eac6	252	regs->syscall = val;
5a0015d6	253	break;
5a0015d6 CZ	254
5a0015d6 CZ	255	default:
c658eac6 CZ	256	return -EIO;
	257	}
	258	return 0;
	259	}
	260
9b05a69e NK	261	long arch_ptrace(struct task_struct *child, long request,
9b05a69e NK	262	unsigned long addr, unsigned long data)
c658eac6 CZ	263	{
c658eac6 CZ	264	int ret = -EPERM;
5ef45079	265	void __user datap = (void __user ) data;
c658eac6 CZ	266
	267	switch (request) {
	268	case PTRACE_PEEKTEXT: /* read word at location addr. */
	269	case PTRACE_PEEKDATA:
	270	ret = generic_ptrace_peekdata(child, addr, data);
	271	break;
	272
	273	case PTRACE_PEEKUSR: /* read register specified by addr. */
5ef45079	274	ret = ptrace_peekusr(child, addr, datap);
c658eac6 CZ	275	break;
	276
	277	case PTRACE_POKETEXT: /* write the word at location addr. */
	278	case PTRACE_POKEDATA:
	279	ret = generic_ptrace_pokedata(child, addr, data);
	280	break;
	281
	282	case PTRACE_POKEUSR: /* write register specified by addr. */
	283	ret = ptrace_pokeusr(child, addr, data);
5a0015d6	284	break;
5a0015d6	285
5a0015d6	286	case PTRACE_GETREGS:
5ef45079	287	ret = ptrace_getregs(child, datap);
5a0015d6	288	break;
5a0015d6 CZ	289
5a0015d6 CZ	290	case PTRACE_SETREGS:
5ef45079	291	ret = ptrace_setregs(child, datap);
5a0015d6	292	break;
5a0015d6	293
c658eac6	294	case PTRACE_GETXTREGS:
5ef45079	295	ret = ptrace_getxregs(child, datap);
5a0015d6	296	break;
5a0015d6	297
c658eac6	298	case PTRACE_SETXTREGS:
5ef45079	299	ret = ptrace_setxregs(child, datap);
5a0015d6 CZ	300	break;
5a0015d6 CZ	301
5a0015d6 CZ	302	default:
5a0015d6 CZ	303	ret = ptrace_request(child, request, addr, data);
c658eac6	304	break;
5a0015d6	305	}
c658eac6	306
5a0015d6 CZ	307	return ret;
	308	}
	309
	310	void do_syscall_trace(void)
	311	{
5a0015d6 CZ	312	/*
	313	* The 0x80 provides a way for the tracing parent to distinguish
	314	* between a syscall stop and SIGTRAP delivery
	315	*/
	316	ptrace_notify(SIGTRAP\|((current->ptrace & PT_TRACESYSGOOD) ? 0x80 : 0));
	317
	318	/*
	319	* this isn't the same as continuing with a signal, but it will do
	320	* for normal use. strace only continues with a signal if the
	321	* stopping signal is not SIGTRAP. -brl
	322	*/
	323	if (current->exit_code) {
	324	send_sig(current->exit_code, current, 1);
	325	current->exit_code = 0;
	326	}
	327	}
fc4fb2ad CZ	328
	329	void do_syscall_trace_enter(struct pt_regs *regs)
	330	{
	331	if (test_thread_flag(TIF_SYSCALL_TRACE)
	332	&& (current->ptrace & PT_PTRACED))
	333	do_syscall_trace();
	334
	335	#if 0
b05d8447	336	audit_syscall_entry(current, AUDIT_ARCH_XTENSA..);
fc4fb2ad CZ	337	#endif
	338	}
	339
	340	void do_syscall_trace_leave(struct pt_regs *regs)
	341	{
	342	if ((test_thread_flag(TIF_SYSCALL_TRACE))
	343	&& (current->ptrace & PT_PTRACED))
	344	do_syscall_trace();
	345	}
	346