[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 wb = regs->windowbase;
	int 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);
	__put_user(regs->threadptr, &gregset->threadptr);

	for (i = 0; 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, ws;

	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(ws, &gregset->windowstart);
	__get_user(wb, &gregset->windowbase);
	__get_user(regs->threadptr, &gregset->threadptr);

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

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

	if (wb != regs->windowbase || ws != regs->windowstart) {
		unsigned long rotws, wmask;

		rotws = (((ws | (ws << WSBITS)) >> wb) &
				((1 << WSBITS) - 1)) & ~1;
		wmask = ((rotws ? WSBITS + 1 - ffs(rotws) : 0) << 4) |
			(rotws & 0xF) | 1;
		regs->windowbase = wb;
		regs->windowstart = ws;
		regs->wmask = wmask;
	}

	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(...);
#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;
42086cec	56	unsigned long wb = regs->windowbase;
4b2bb03f	57	int i;
c658eac6 CZ	58
	59	if (!access_ok(VERIFY_WRITE, uregs, sizeof(xtensa_gregset_t)))
	60	return -EIO;
	61
42086cec CZ	62	__put_user(regs->pc, &gregset->pc);
	63	__put_user(regs->ps & ~(1 << PS_EXCM_BIT), &gregset->ps);
	64	__put_user(regs->lbeg, &gregset->lbeg);
	65	__put_user(regs->lend, &gregset->lend);
	66	__put_user(regs->lcount, &gregset->lcount);
	67	__put_user(regs->windowstart, &gregset->windowstart);
	68	__put_user(regs->windowbase, &gregset->windowbase);
c50842df	69	__put_user(regs->threadptr, &gregset->threadptr);
c658eac6	70
4b2bb03f MF	71	for (i = 0; i < XCHAL_NUM_AREGS; i++)
	72	__put_user(regs->areg[i],
	73	gregset->a + ((wb * 4 + i) % XCHAL_NUM_AREGS));
42086cec CZ	74
42086cec CZ	75	return 0;
c658eac6	76	}
5a0015d6	77
c658eac6 CZ	78	int ptrace_setregs(struct task_struct child, void __user uregs)
	79	{
	80	struct pt_regs *regs = task_pt_regs(child);
	81	xtensa_gregset_t *gregset = uregs;
	82	const unsigned long ps_mask = PS_CALLINC_MASK \| PS_OWB_MASK;
c658eac6	83	unsigned long ps;
4b2bb03f	84	unsigned long wb, ws;
c658eac6 CZ	85
	86	if (!access_ok(VERIFY_WRITE, uregs, sizeof(xtensa_gregset_t)))
	87	return -EIO;
	88
42086cec CZ	89	__get_user(regs->pc, &gregset->pc);
	90	__get_user(ps, &gregset->ps);
	91	__get_user(regs->lbeg, &gregset->lbeg);
	92	__get_user(regs->lend, &gregset->lend);
	93	__get_user(regs->lcount, &gregset->lcount);
4b2bb03f	94	__get_user(ws, &gregset->windowstart);
42086cec	95	__get_user(wb, &gregset->windowbase);
c50842df	96	__get_user(regs->threadptr, &gregset->threadptr);
c658eac6 CZ	97
	98	regs->ps = (regs->ps & ~ps_mask) \| (ps & ps_mask) \| (1 << PS_EXCM_BIT);
	99
42086cec CZ	100	if (wb >= XCHAL_NUM_AREGS / 4)
42086cec CZ	101	return -EFAULT;
c658eac6	102
4b2bb03f MF	103	if (wb != regs->windowbase \|\| ws != regs->windowstart) {
	104	unsigned long rotws, wmask;
	105
	106	rotws = (((ws \| (ws << WSBITS)) >> wb) &
	107	((1 << WSBITS) - 1)) & ~1;
	108	wmask = ((rotws ? WSBITS + 1 - ffs(rotws) : 0) << 4) \|
	109	(rotws & 0xF) \| 1;
	110	regs->windowbase = wb;
	111	regs->windowstart = ws;
	112	regs->wmask = wmask;
	113	}
42086cec CZ	114
42086cec CZ	115	if (wb != 0 && __copy_from_user(regs->areg + XCHAL_NUM_AREGS - wb * 4,
4b2bb03f	116	gregset->a, wb * 16))
42086cec CZ	117	return -EFAULT;
42086cec CZ	118
4b2bb03f MF	119	if (__copy_from_user(regs->areg, gregset->a + wb * 4,
4b2bb03f MF	120	(WSBITS - wb) * 16))
42086cec CZ	121	return -EFAULT;
	122
	123	return 0;
c658eac6	124	}
5a0015d6	125
5a0015d6	126
c658eac6 CZ	127	int ptrace_getxregs(struct task_struct child, void __user uregs)
	128	{
	129	struct pt_regs *regs = task_pt_regs(child);
	130	struct thread_info *ti = task_thread_info(child);
	131	elf_xtregs_t __user *xtregs = uregs;
	132	int ret = 0;
	133
	134	if (!access_ok(VERIFY_WRITE, uregs, sizeof(elf_xtregs_t)))
	135	return -EIO;
	136
	137	#if XTENSA_HAVE_COPROCESSORS
	138	/* Flush all coprocessor registers to memory. */
	139	coprocessor_flush_all(ti);
	140	ret \|= __copy_to_user(&xtregs->cp0, &ti->xtregs_cp,
	141	sizeof(xtregs_coprocessor_t));
	142	#endif
	143	ret \|= __copy_to_user(&xtregs->opt, &regs->xtregs_opt,
	144	sizeof(xtregs->opt));
	145	ret \|= __copy_to_user(&xtregs->user,&ti->xtregs_user,
	146	sizeof(xtregs->user));
5a0015d6	147
c658eac6 CZ	148	return ret ? -EFAULT : 0;
	149	}
	150
	151	int ptrace_setxregs(struct task_struct child, void __user uregs)
	152	{
	153	struct thread_info *ti = task_thread_info(child);
	154	struct pt_regs *regs = task_pt_regs(child);
	155	elf_xtregs_t *xtregs = uregs;
	156	int ret = 0;
	157
0d0138eb DR	158	if (!access_ok(VERIFY_READ, uregs, sizeof(elf_xtregs_t)))
	159	return -EFAULT;
	160
c658eac6 CZ	161	#if XTENSA_HAVE_COPROCESSORS
	162	/* Flush all coprocessors before we overwrite them. */
	163	coprocessor_flush_all(ti);
	164	coprocessor_release_all(ti);
	165
c4c4594b	166	ret \|= __copy_from_user(&ti->xtregs_cp, &xtregs->cp0,
c658eac6 CZ	167	sizeof(xtregs_coprocessor_t));
	168	#endif
	169	ret \|= __copy_from_user(&regs->xtregs_opt, &xtregs->opt,
	170	sizeof(xtregs->opt));
	171	ret \|= __copy_from_user(&ti->xtregs_user, &xtregs->user,
	172	sizeof(xtregs->user));
	173
	174	return ret ? -EFAULT : 0;
	175	}
	176
	177	int ptrace_peekusr(struct task_struct child, long regno, long __user ret)
	178	{
	179	struct pt_regs *regs;
	180	unsigned long tmp;
	181
	182	regs = task_pt_regs(child);
	183	tmp = 0; /* Default return value. */
5a0015d6	184
c658eac6	185	switch(regno) {
5a0015d6 CZ	186
5a0015d6 CZ	187	case REG_AR_BASE ... REG_AR_BASE + XCHAL_NUM_AREGS - 1:
c658eac6	188	tmp = regs->areg[regno - REG_AR_BASE];
5a0015d6	189	break;
c658eac6	190
5a0015d6	191	case REG_A_BASE ... REG_A_BASE + 15:
c658eac6	192	tmp = regs->areg[regno - REG_A_BASE];
5a0015d6	193	break;
c658eac6	194
5a0015d6 CZ	195	case REG_PC:
	196	tmp = regs->pc;
	197	break;
c658eac6	198
5a0015d6 CZ	199	case REG_PS:
	200	/* Note: PS.EXCM is not set while user task is running;
	201	* its being set in regs is for exception handling
	202	* convenience. */
173d6681	203	tmp = (regs->ps & ~(1 << PS_EXCM_BIT));
5a0015d6	204	break;
c658eac6	205
5a0015d6	206	case REG_WB:
c658eac6 CZ	207	break; /* tmp = 0 */
c658eac6 CZ	208
5a0015d6	209	case REG_WS:
c658eac6 CZ	210	{
	211	unsigned long wb = regs->windowbase;
	212	unsigned long ws = regs->windowstart;
	213	tmp = ((ws>>wb) \| (ws<<(WSBITS-wb))) & ((1<<WSBITS)-1);
5a0015d6	214	break;
c658eac6	215	}
5a0015d6 CZ	216	case REG_LBEG:
	217	tmp = regs->lbeg;
	218	break;
c658eac6	219
5a0015d6 CZ	220	case REG_LEND:
	221	tmp = regs->lend;
	222	break;
c658eac6	223
5a0015d6 CZ	224	case REG_LCOUNT:
	225	tmp = regs->lcount;
	226	break;
c658eac6	227
5a0015d6 CZ	228	case REG_SAR:
	229	tmp = regs->sar;
	230	break;
c658eac6	231
5a0015d6 CZ	232	case SYSCALL_NR:
	233	tmp = regs->syscall;
	234	break;
5a0015d6	235
c658eac6 CZ	236	default:
	237	return -EIO;
	238	}
	239	return put_user(tmp, ret);
	240	}
5a0015d6	241
c658eac6 CZ	242	int ptrace_pokeusr(struct task_struct *child, long regno, long val)
	243	{
	244	struct pt_regs *regs;
	245	regs = task_pt_regs(child);
5a0015d6	246
c658eac6	247	switch (regno) {
5a0015d6	248	case REG_AR_BASE ... REG_AR_BASE + XCHAL_NUM_AREGS - 1:
c658eac6	249	regs->areg[regno - REG_AR_BASE] = val;
5a0015d6	250	break;
c658eac6	251
5a0015d6	252	case REG_A_BASE ... REG_A_BASE + 15:
c658eac6	253	regs->areg[regno - REG_A_BASE] = val;
5a0015d6	254	break;
c658eac6	255
5a0015d6	256	case REG_PC:
c658eac6	257	regs->pc = val;
5a0015d6	258	break;
c658eac6	259
5a0015d6	260	case SYSCALL_NR:
c658eac6	261	regs->syscall = val;
5a0015d6	262	break;
5a0015d6 CZ	263
5a0015d6 CZ	264	default:
c658eac6 CZ	265	return -EIO;
	266	}
	267	return 0;
	268	}
	269
9b05a69e NK	270	long arch_ptrace(struct task_struct *child, long request,
9b05a69e NK	271	unsigned long addr, unsigned long data)
c658eac6 CZ	272	{
c658eac6 CZ	273	int ret = -EPERM;
5ef45079	274	void __user datap = (void __user ) data;
c658eac6 CZ	275
	276	switch (request) {
	277	case PTRACE_PEEKTEXT: /* read word at location addr. */
	278	case PTRACE_PEEKDATA:
	279	ret = generic_ptrace_peekdata(child, addr, data);
	280	break;
	281
	282	case PTRACE_PEEKUSR: /* read register specified by addr. */
5ef45079	283	ret = ptrace_peekusr(child, addr, datap);
c658eac6 CZ	284	break;
	285
	286	case PTRACE_POKETEXT: /* write the word at location addr. */
	287	case PTRACE_POKEDATA:
	288	ret = generic_ptrace_pokedata(child, addr, data);
	289	break;
	290
	291	case PTRACE_POKEUSR: /* write register specified by addr. */
	292	ret = ptrace_pokeusr(child, addr, data);
5a0015d6	293	break;
5a0015d6	294
5a0015d6	295	case PTRACE_GETREGS:
5ef45079	296	ret = ptrace_getregs(child, datap);
5a0015d6	297	break;
5a0015d6 CZ	298
5a0015d6 CZ	299	case PTRACE_SETREGS:
5ef45079	300	ret = ptrace_setregs(child, datap);
5a0015d6	301	break;
5a0015d6	302
c658eac6	303	case PTRACE_GETXTREGS:
5ef45079	304	ret = ptrace_getxregs(child, datap);
5a0015d6	305	break;
5a0015d6	306
c658eac6	307	case PTRACE_SETXTREGS:
5ef45079	308	ret = ptrace_setxregs(child, datap);
5a0015d6 CZ	309	break;
5a0015d6 CZ	310
5a0015d6 CZ	311	default:
5a0015d6 CZ	312	ret = ptrace_request(child, request, addr, data);
c658eac6	313	break;
5a0015d6	314	}
c658eac6	315
5a0015d6 CZ	316	return ret;
	317	}
	318
	319	void do_syscall_trace(void)
	320	{
5a0015d6 CZ	321	/*
	322	* The 0x80 provides a way for the tracing parent to distinguish
	323	* between a syscall stop and SIGTRAP delivery
	324	*/
	325	ptrace_notify(SIGTRAP\|((current->ptrace & PT_TRACESYSGOOD) ? 0x80 : 0));
	326
	327	/*
	328	* this isn't the same as continuing with a signal, but it will do
	329	* for normal use. strace only continues with a signal if the
	330	* stopping signal is not SIGTRAP. -brl
	331	*/
	332	if (current->exit_code) {
	333	send_sig(current->exit_code, current, 1);
	334	current->exit_code = 0;
	335	}
	336	}
fc4fb2ad CZ	337
	338	void do_syscall_trace_enter(struct pt_regs *regs)
	339	{
	340	if (test_thread_flag(TIF_SYSCALL_TRACE)
	341	&& (current->ptrace & PT_PTRACED))
	342	do_syscall_trace();
	343
	344	#if 0
91397401	345	audit_syscall_entry(...);
fc4fb2ad CZ	346	#endif
	347	}
	348
	349	void do_syscall_trace_leave(struct pt_regs *regs)
	350	{
	351	if ((test_thread_flag(TIF_SYSCALL_TRACE))
	352	&& (current->ptrace & PT_PTRACED))
	353	do_syscall_trace();
	354	}