[apple/xnu.git] / bsd / dev / dtrace / sdt.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2009 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/* #pragma ident	"@(#)sdt.c	1.9	08/07/01 SMI" */

#ifdef KERNEL
#ifndef _KERNEL
#define _KERNEL /* Solaris vs. Darwin */
#endif
#endif

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/errno.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/conf.h>
#include <sys/fcntl.h>
#include <miscfs/devfs/devfs.h>

#include <sys/dtrace.h>
#include <sys/dtrace_impl.h>

#include <sys/dtrace_glue.h>

#include <sys/sdt_impl.h>
extern int dtrace_kernel_symbol_mode;

struct savearea_t; /* Used anonymously */
typedef kern_return_t (*perfCallback)(int, struct savearea_t *, uintptr_t *, int);

#if defined(__i386__) || defined(__x86_64__)
extern perfCallback tempDTraceTrapHook;
extern kern_return_t fbt_perfCallback(int, struct savearea_t *, int, int);

#define	SDT_PATCHVAL	0xf0
#define	SDT_AFRAMES		6
#else
#error Unknown architecture
#endif

#define	SDT_PROBETAB_SIZE	0x1000		/* 4k entries -- 16K total */

#if defined(__x86_64__)
#define DTRACE_PROBE_PREFIX "_dtrace_probeDOLLAR"
#else
#define DTRACE_PROBE_PREFIX "_dtrace_probe$"
#endif

static dev_info_t		*sdt_devi;
static int			sdt_verbose = 0;
sdt_probe_t		**sdt_probetab;
int			sdt_probetab_size;
int			sdt_probetab_mask;

/*ARGSUSED*/
static void
__sdt_provide_module(void *arg, struct modctl *ctl)
{
#pragma unused(arg)
	struct module *mp = (struct module *)ctl->mod_address;
	char *modname = ctl->mod_modname;
	sdt_probedesc_t *sdpd;
	sdt_probe_t *sdp, *old;
	sdt_provider_t *prov;
	int len;

	/*
	 * One for all, and all for one:  if we haven't yet registered all of
	 * our providers, we'll refuse to provide anything.
	 */
	for (prov = sdt_providers; prov->sdtp_name != NULL; prov++) {
		if (prov->sdtp_id == DTRACE_PROVNONE)
			return;
	}

	if (!mp || mp->sdt_nprobes != 0 || (sdpd = mp->sdt_probes) == NULL)
		return;

	for (sdpd = mp->sdt_probes; sdpd != NULL; sdpd = sdpd->sdpd_next) {
	    const char *name = sdpd->sdpd_name, *func;
	    char *nname;
		int i, j;
		dtrace_id_t id;

		for (prov = sdt_providers; prov->sdtp_prefix != NULL; prov++) {
			const char *prefpart, *prefix = prov->sdtp_prefix;

			if ((prefpart = strstr(name, prefix))) {
				name = prefpart + strlen(prefix);
				break;
			}
		}

		nname = kmem_alloc(len = strlen(name) + 1, KM_SLEEP);

		for (i = 0, j = 0; name[j] != '\0'; i++) {
			if (name[j] == '_' && name[j + 1] == '_') {
				nname[i] = '-';
				j += 2;
			} else {
				nname[i] = name[j++];
			}
		}

		nname[i] = '\0';

		sdp = kmem_zalloc(sizeof (sdt_probe_t), KM_SLEEP);
		sdp->sdp_loadcnt = ctl->mod_loadcnt;
		sdp->sdp_ctl = ctl;
		sdp->sdp_name = nname;
		sdp->sdp_namelen = len;
		sdp->sdp_provider = prov;

		func = sdpd->sdpd_func;

		if (func == NULL)
			func = "<unknown>";

		/*
		 * We have our provider.  Now create the probe.
		 */
		if ((id = dtrace_probe_lookup(prov->sdtp_id, modname,
		    func, nname)) != DTRACE_IDNONE) {
			old = dtrace_probe_arg(prov->sdtp_id, id);
			ASSERT(old != NULL);

			sdp->sdp_next = old->sdp_next;
			sdp->sdp_id = id;
			old->sdp_next = sdp;
		} else {
			sdp->sdp_id = dtrace_probe_create(prov->sdtp_id,
			    modname, func, nname, SDT_AFRAMES, sdp);

			mp->sdt_nprobes++;
		}

		sdp->sdp_hashnext =
		    sdt_probetab[SDT_ADDR2NDX(sdpd->sdpd_offset)];
		sdt_probetab[SDT_ADDR2NDX(sdpd->sdpd_offset)] = sdp;

		sdp->sdp_patchval = SDT_PATCHVAL;
		sdp->sdp_patchpoint = (sdt_instr_t *)sdpd->sdpd_offset;
		sdp->sdp_savedval = *sdp->sdp_patchpoint;
	}
}

/*ARGSUSED*/
static void
sdt_destroy(void *arg, dtrace_id_t id, void *parg)
{
#pragma unused(arg,id)
	sdt_probe_t *sdp = parg, *old, *last, *hash;
	int ndx;
#if !defined(__APPLE__)
	struct modctl *ctl = sdp->sdp_ctl;

	if (ctl != NULL && ctl->mod_loadcnt == sdp->sdp_loadcnt) {
		if ((ctl->mod_loadcnt == sdp->sdp_loadcnt &&
		    ctl->mod_loaded)) {
			((struct module *)(ctl->mod_mp))->sdt_nprobes--;
		}
	}
#endif /* __APPLE__ */

	while (sdp != NULL) {
		old = sdp;

		/*
		 * Now we need to remove this probe from the sdt_probetab.
		 */
		ndx = SDT_ADDR2NDX(sdp->sdp_patchpoint);
		last = NULL;
		hash = sdt_probetab[ndx];

		while (hash != sdp) {
			ASSERT(hash != NULL);
			last = hash;
			hash = hash->sdp_hashnext;
		}

		if (last != NULL) {
			last->sdp_hashnext = sdp->sdp_hashnext;
		} else {
			sdt_probetab[ndx] = sdp->sdp_hashnext;
		}

		kmem_free(sdp->sdp_name, sdp->sdp_namelen);
		sdp = sdp->sdp_next;
		kmem_free(old, sizeof (sdt_probe_t));
	}
}

/*ARGSUSED*/
static int
sdt_enable(void *arg, dtrace_id_t id, void *parg)
{
#pragma unused(arg,id)
	sdt_probe_t *sdp = parg;
	struct modctl *ctl = sdp->sdp_ctl;

	ctl->mod_nenabled++;

	/*
	 * If this module has disappeared since we discovered its probes,
	 * refuse to enable it.
	 */
	if (!ctl->mod_loaded) {
		if (sdt_verbose) {
			cmn_err(CE_NOTE, "sdt is failing for probe %s "
			    "(module %s unloaded)",
			    sdp->sdp_name, ctl->mod_modname);
		}
		goto err;
	}

	/*
	 * Now check that our modctl has the expected load count.  If it
	 * doesn't, this module must have been unloaded and reloaded -- and
	 * we're not going to touch it.
	 */
	if (ctl->mod_loadcnt != sdp->sdp_loadcnt) {
		if (sdt_verbose) {
			cmn_err(CE_NOTE, "sdt is failing for probe %s "
			    "(module %s reloaded)",
			    sdp->sdp_name, ctl->mod_modname);
		}
		goto err;
	}

	dtrace_casptr(&tempDTraceTrapHook, NULL, fbt_perfCallback);
	if (tempDTraceTrapHook != (perfCallback)fbt_perfCallback) {
		if (sdt_verbose) {
			cmn_err(CE_NOTE, "sdt_enable is failing for probe %s "
			    "in module %s: tempDTraceTrapHook already occupied.",
			    sdp->sdp_name, ctl->mod_modname);
		}
		return (0);
	}

	while (sdp != NULL) {
		(void)ml_nofault_copy( (vm_offset_t)&sdp->sdp_patchval, (vm_offset_t)sdp->sdp_patchpoint, 
		                       (vm_size_t)sizeof(sdp->sdp_patchval));
		sdp = sdp->sdp_next;
	}

err:
	return (0);
}

/*ARGSUSED*/
static void
sdt_disable(void *arg, dtrace_id_t id, void *parg)
{
#pragma unused(arg,id)
	sdt_probe_t *sdp = parg;
	struct modctl *ctl = sdp->sdp_ctl;

	ctl->mod_nenabled--;

	if (!ctl->mod_loaded || ctl->mod_loadcnt != sdp->sdp_loadcnt)
		goto err;

	while (sdp != NULL) {
		(void)ml_nofault_copy( (vm_offset_t)&sdp->sdp_savedval, (vm_offset_t)sdp->sdp_patchpoint, 
		                       (vm_size_t)sizeof(sdp->sdp_savedval));
		sdp = sdp->sdp_next;
	}

err:
	;
}

static dtrace_pops_t sdt_pops = {
	NULL,
	sdt_provide_module,
	sdt_enable,
	sdt_disable,
	NULL,
	NULL,
	sdt_getargdesc,
	sdt_getarg,
	NULL,
	sdt_destroy
};

/*ARGSUSED*/
static int
sdt_attach(dev_info_t *devi, ddi_attach_cmd_t cmd)
{
#pragma unused(cmd)
	sdt_provider_t *prov;

	if (ddi_create_minor_node(devi, "sdt", S_IFCHR,
	    0, DDI_PSEUDO, 0) == DDI_FAILURE) {
		cmn_err(CE_NOTE, "/dev/sdt couldn't create minor node");
		ddi_remove_minor_node(devi, NULL);
		return (DDI_FAILURE);
	}

	ddi_report_dev(devi);
	sdt_devi = devi;

	if (sdt_probetab_size == 0)
		sdt_probetab_size = SDT_PROBETAB_SIZE;

	sdt_probetab_mask = sdt_probetab_size - 1;
	sdt_probetab =
	    kmem_zalloc(sdt_probetab_size * sizeof (sdt_probe_t *), KM_SLEEP);
	dtrace_invop_add(sdt_invop);

	for (prov = sdt_providers; prov->sdtp_name != NULL; prov++) {
		if (dtrace_register(prov->sdtp_name, prov->sdtp_attr,
		    DTRACE_PRIV_KERNEL, NULL,
		    &sdt_pops, prov, &prov->sdtp_id) != 0) {
			cmn_err(CE_WARN, "failed to register sdt provider %s",
			    prov->sdtp_name);
		}
	}

	return (DDI_SUCCESS);
}

#if !defined(__APPLE__)
/*ARGSUSED*/
static int
sdt_detach(dev_info_t *dip, ddi_detach_cmd_t cmd)
{
	sdt_provider_t *prov;

	switch (cmd) {
	case DDI_DETACH:
		break;

	case DDI_SUSPEND:
		return (DDI_SUCCESS);

	default:
		return (DDI_FAILURE);
	}

	for (prov = sdt_providers; prov->sdtp_name != NULL; prov++) {
		if (prov->sdtp_id != DTRACE_PROVNONE) {
			if (dtrace_unregister(prov->sdtp_id) != 0)
				return (DDI_FAILURE);

			prov->sdtp_id = DTRACE_PROVNONE;
		}
	}

	dtrace_invop_remove(sdt_invop);
	kmem_free(sdt_probetab, sdt_probetab_size * sizeof (sdt_probe_t *));

	return (DDI_SUCCESS);
}

/*ARGSUSED*/
static int
sdt_info(dev_info_t *dip, ddi_info_cmd_t infocmd, void *arg, void **result)
{
	int error;

	switch (infocmd) {
	case DDI_INFO_DEVT2DEVINFO:
		*result = (void *)sdt_devi;
		error = DDI_SUCCESS;
		break;
	case DDI_INFO_DEVT2INSTANCE:
		*result = (void *)0;
		error = DDI_SUCCESS;
		break;
	default:
		error = DDI_FAILURE;
	}
	return (error);
}

/*ARGSUSED*/
static int
sdt_open(dev_t *devp, int flag, int otyp, cred_t *cred_p)
{
	return (0);
}

static struct cb_ops sdt_cb_ops = {
	sdt_open,		/* open */
	nodev,			/* close */
	nulldev,		/* strategy */
	nulldev,		/* print */
	nodev,			/* dump */
	nodev,			/* read */
	nodev,			/* write */
	nodev,			/* ioctl */
	nodev,			/* devmap */
	nodev,			/* mmap */
	nodev,			/* segmap */
	nochpoll,		/* poll */
	ddi_prop_op,		/* cb_prop_op */
	0,			/* streamtab  */
	D_NEW | D_MP		/* Driver compatibility flag */
};

static struct dev_ops sdt_ops = {
	DEVO_REV,		/* devo_rev, */
	0,			/* refcnt  */
	sdt_info,		/* get_dev_info */
	nulldev,		/* identify */
	nulldev,		/* probe */
	sdt_attach,		/* attach */
	sdt_detach,		/* detach */
	nodev,			/* reset */
	&sdt_cb_ops,		/* driver operations */
	NULL,			/* bus operations */
	nodev			/* dev power */
};

/*
 * Module linkage information for the kernel.
 */
static struct modldrv modldrv = {
	&mod_driverops,		/* module type (this is a pseudo driver) */
	"Statically Defined Tracing",	/* name of module */
	&sdt_ops,		/* driver ops */
};

static struct modlinkage modlinkage = {
	MODREV_1,
	(void *)&modldrv,
	NULL
};

int
_init(void)
{
	return (mod_install(&modlinkage));
}

int
_info(struct modinfo *modinfop)
{
	return (mod_info(&modlinkage, modinfop));
}

int
_fini(void)
{
	return (mod_remove(&modlinkage));
}
#else
d_open_t _sdt_open;

int _sdt_open(dev_t dev, int flags, int devtype, struct proc *p)
{
#pragma unused(dev,flags,devtype,p)
	return 0;
}

#define SDT_MAJOR  -24 /* let the kernel pick the device number */

/*
 * A struct describing which functions will get invoked for certain
 * actions.
 */
static struct cdevsw sdt_cdevsw =
{
	_sdt_open,		/* open */
	eno_opcl,			/* close */
	eno_rdwrt,			/* read */
	eno_rdwrt,			/* write */
	eno_ioctl,			/* ioctl */
	(stop_fcn_t *)nulldev, /* stop */
	(reset_fcn_t *)nulldev, /* reset */
	NULL,				/* tty's */
	eno_select,			/* select */
	eno_mmap,			/* mmap */
	eno_strat,			/* strategy */
	eno_getc,			/* getc */
	eno_putc,			/* putc */
	0					/* type */
};

static int gSDTInited = 0;
static struct modctl g_sdt_kernctl;
static struct module g_sdt_mach_module;

#include <mach-o/nlist.h>
#include <libkern/kernel_mach_header.h>

#if defined(__LP64__)
#define KERNEL_MAGIC MH_MAGIC_64
typedef struct nlist_64 kernel_nlist_t;
#else
#define KERNEL_MAGIC MH_MAGIC
typedef struct nlist kernel_nlist_t;
#endif

void sdt_init( void )
{
	if (0 == gSDTInited)
	{
		int majdevno = cdevsw_add(SDT_MAJOR, &sdt_cdevsw);
		
		if (majdevno < 0) {
			printf("sdt_init: failed to allocate a major number!\n");
			gSDTInited = 0;
			return;
		}

		if (KERNEL_MAGIC != _mh_execute_header.magic) {
			g_sdt_kernctl.mod_address = (vm_address_t)NULL;
			g_sdt_kernctl.mod_size = 0;
		} else {
			kernel_mach_header_t        *mh;
			struct load_command         *cmd;
			kernel_segment_command_t    *orig_ts = NULL, *orig_le = NULL;
			struct symtab_command       *orig_st = NULL;
			kernel_nlist_t		    *sym = NULL;
			char                        *strings;
			unsigned int 		    i;
			
			g_sdt_mach_module.sdt_nprobes = 0;
			g_sdt_mach_module.sdt_probes = NULL;
			
			g_sdt_kernctl.mod_address = (vm_address_t)&g_sdt_mach_module;
			g_sdt_kernctl.mod_size = 0;
			strncpy((char *)&(g_sdt_kernctl.mod_modname), "mach_kernel", KMOD_MAX_NAME);
			
			g_sdt_kernctl.mod_next = NULL;
			g_sdt_kernctl.mod_stale = NULL;
			g_sdt_kernctl.mod_id = 0;
			g_sdt_kernctl.mod_loadcnt = 1;
			g_sdt_kernctl.mod_loaded = 1;
			g_sdt_kernctl.mod_flags = 0;
			g_sdt_kernctl.mod_nenabled = 0;
			
			mh = &_mh_execute_header;
			cmd = (struct load_command*) &mh[1];
			for (i = 0; i < mh->ncmds; i++) {
				if (cmd->cmd == LC_SEGMENT_KERNEL) {
					kernel_segment_command_t *orig_sg = (kernel_segment_command_t *) cmd;
					
					if (LIT_STRNEQL(orig_sg->segname, SEG_TEXT))
						orig_ts = orig_sg;
					else if (LIT_STRNEQL(orig_sg->segname, SEG_LINKEDIT))
						orig_le = orig_sg;
					else if (LIT_STRNEQL(orig_sg->segname, ""))
						orig_ts = orig_sg; /* kexts have a single unnamed segment */
				}
				else if (cmd->cmd == LC_SYMTAB)
					orig_st = (struct symtab_command *) cmd;
				
				cmd = (struct load_command *) ((uintptr_t) cmd + cmd->cmdsize);
			}
			
			if ((orig_ts == NULL) || (orig_st == NULL) || (orig_le == NULL))
				return;
			
			sym = (kernel_nlist_t *)(orig_le->vmaddr + orig_st->symoff - orig_le->fileoff);
			strings = (char *)(orig_le->vmaddr + orig_st->stroff - orig_le->fileoff);
			
			for (i = 0; i < orig_st->nsyms; i++) {
				uint8_t n_type = sym[i].n_type & (N_TYPE | N_EXT);
				char *name = strings + sym[i].n_un.n_strx;
				const char *prev_name;
				unsigned long best;
				unsigned int j;
				
				/* Check that the symbol is a global and that it has a name. */
				if (((N_SECT | N_EXT) != n_type && (N_ABS | N_EXT) != n_type))
					continue;
				
				if (0 == sym[i].n_un.n_strx) /* iff a null, "", name. */
					continue;
				
				/* Lop off omnipresent leading underscore. */
				if (*name == '_')
					name += 1;
				
				if (strncmp(name, DTRACE_PROBE_PREFIX, sizeof(DTRACE_PROBE_PREFIX) - 1) == 0) {
					sdt_probedesc_t *sdpd = kmem_alloc(sizeof(sdt_probedesc_t), KM_SLEEP);
					int len = strlen(name) + 1;
					
					sdpd->sdpd_name = kmem_alloc(len, KM_SLEEP);
					strncpy(sdpd->sdpd_name, name, len); /* NUL termination is ensured. */
					
					prev_name = "<unknown>";
					best = 0;
					
					/*
					 * Find the symbol immediately preceding the sdt probe site just discovered,
					 * that symbol names the function containing the sdt probe.
					 */
					for (j = 0; j < orig_st->nsyms; j++) {
						uint8_t jn_type = sym[j].n_type & (N_TYPE | N_EXT);
						char *jname = strings + sym[j].n_un.n_strx;
						
						if (((N_SECT | N_EXT) != jn_type && (N_ABS | N_EXT) != jn_type))
							continue;
						
						if (0 == sym[j].n_un.n_strx) /* iff a null, "", name. */
							continue;
						
						if (*jname == '_')
							jname += 1;
						
						if (*(unsigned long *)sym[i].n_value <= (unsigned long)sym[j].n_value)
							continue;
						
						if ((unsigned long)sym[j].n_value > best) {
							best = (unsigned long)sym[j].n_value;
							prev_name = jname;
						}
					}
					
					sdpd->sdpd_func = kmem_alloc((len = strlen(prev_name) + 1), KM_SLEEP);
					strncpy(sdpd->sdpd_func, prev_name, len); /* NUL termination is ensured. */
					
					sdpd->sdpd_offset = *(unsigned long *)sym[i].n_value;
					
					sdpd->sdpd_next = g_sdt_mach_module.sdt_probes;
					g_sdt_mach_module.sdt_probes = sdpd;
				} else {
					prev_name = name;
				}
			}
		}
		
		sdt_attach( (dev_info_t	*)(uintptr_t)majdevno, DDI_ATTACH );
		
		gSDTInited = 1;
	} else
		panic("sdt_init: called twice!\n");
}

#undef SDT_MAJOR

/*ARGSUSED*/
void
sdt_provide_module(void *arg, struct modctl *ctl)
{
#pragma unused(arg)
	ASSERT(ctl != NULL);
	ASSERT(dtrace_kernel_symbol_mode != DTRACE_KERNEL_SYMBOLS_NEVER);
	lck_mtx_assert(&mod_lock, LCK_MTX_ASSERT_OWNED);
	
	if (MOD_SDT_DONE(ctl))
		return;
		
	if (MOD_IS_MACH_KERNEL(ctl)) {
		__sdt_provide_module(arg, &g_sdt_kernctl);
		
		sdt_probedesc_t *sdpd = g_sdt_mach_module.sdt_probes;
		while (sdpd) {
			sdt_probedesc_t *this_sdpd = sdpd;
			kmem_free((void *)sdpd->sdpd_name, strlen(sdpd->sdpd_name) + 1);
			kmem_free((void *)sdpd->sdpd_func, strlen(sdpd->sdpd_func) + 1);
			sdpd = sdpd->sdpd_next;
			kmem_free((void *)this_sdpd, sizeof(sdt_probedesc_t));
		}
		g_sdt_mach_module.sdt_probes = NULL;
	} else {
		/* FIXME -- sdt in kext not yet supported */
	}
	
	/* Need to mark this module as completed */
	ctl->mod_flags |= MODCTL_SDT_PROBES_PROVIDED;
}

#endif /* __APPLE__ */
Commit	Line	Data
2d21ac55 A	1	/*
	2	* CDDL HEADER START
	3	*
	4	* The contents of this file are subject to the terms of the
	5	* Common Development and Distribution License (the "License").
	6	* You may not use this file except in compliance with the License.
	7	*
	8	* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
	9	* or http://www.opensolaris.org/os/licensing.
	10	* See the License for the specific language governing permissions
	11	* and limitations under the License.
	12	*
	13	* When distributing Covered Code, include this CDDL HEADER in each
	14	* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
	15	* If applicable, add the following below this CDDL HEADER, with the
	16	* fields enclosed by brackets "[]" replaced with your own identifying
	17	* information: Portions Copyright [yyyy] [name of copyright owner]
	18	*
	19	* CDDL HEADER END
	20	*/
	21	/*
6d2010ae	22	* Copyright 2009 Sun Microsystems, Inc. All rights reserved.
2d21ac55 A	23	* Use is subject to license terms.
	24	*/
	25
b0d623f7	26	/* #pragma ident "@(#)sdt.c 1.9 08/07/01 SMI" */
2d21ac55 A	27
	28	#ifdef KERNEL
	29	#ifndef _KERNEL
	30	#define _KERNEL /* Solaris vs. Darwin */
	31	#endif
	32	#endif
	33
	34	#include <sys/param.h>
	35	#include <sys/systm.h>
	36	#include <sys/errno.h>
	37	#include <sys/stat.h>
	38	#include <sys/ioctl.h>
	39	#include <sys/conf.h>
	40	#include <sys/fcntl.h>
	41	#include <miscfs/devfs/devfs.h>
	42
	43	#include <sys/dtrace.h>
	44	#include <sys/dtrace_impl.h>
	45
	46	#include <sys/dtrace_glue.h>
	47
	48	#include <sys/sdt_impl.h>
6d2010ae	49	extern int dtrace_kernel_symbol_mode;
2d21ac55 A	50
2d21ac55 A	51	struct savearea_t; /* Used anonymously */
6d2010ae	52	typedef kern_return_t (perfCallback)(int, struct savearea_t , uintptr_t *, int);
2d21ac55	53
6d2010ae	54	#if defined(__i386__) \|\| defined(__x86_64__)
2d21ac55 A	55	extern perfCallback tempDTraceTrapHook;
	56	extern kern_return_t fbt_perfCallback(int, struct savearea_t *, int, int);
	57
	58	#define SDT_PATCHVAL 0xf0
	59	#define SDT_AFRAMES 6
	60	#else
	61	#error Unknown architecture
	62	#endif
	63
	64	#define SDT_PROBETAB_SIZE 0x1000 /* 4k entries -- 16K total */
	65
b0d623f7 A	66	#if defined(__x86_64__)
	67	#define DTRACE_PROBE_PREFIX "_dtrace_probeDOLLAR"
	68	#else
	69	#define DTRACE_PROBE_PREFIX "_dtrace_probe$"
	70	#endif
	71
2d21ac55 A	72	static dev_info_t *sdt_devi;
	73	static int sdt_verbose = 0;
	74	sdt_probe_t **sdt_probetab;
	75	int sdt_probetab_size;
	76	int sdt_probetab_mask;
	77
	78	/ARGSUSED/
	79	static void
	80	__sdt_provide_module(void arg, struct modctl ctl)
	81	{
	82	#pragma unused(arg)
6d2010ae	83	struct module mp = (struct module )ctl->mod_address;
2d21ac55 A	84	char *modname = ctl->mod_modname;
	85	sdt_probedesc_t *sdpd;
	86	sdt_probe_t sdp, old;
	87	sdt_provider_t *prov;
	88	int len;
	89
	90	/*
	91	* One for all, and all for one: if we haven't yet registered all of
	92	* our providers, we'll refuse to provide anything.
	93	*/
	94	for (prov = sdt_providers; prov->sdtp_name != NULL; prov++) {
	95	if (prov->sdtp_id == DTRACE_PROVNONE)
	96	return;
	97	}
	98
b0d623f7	99	if (!mp \|\| mp->sdt_nprobes != 0 \|\| (sdpd = mp->sdt_probes) == NULL)
2d21ac55 A	100	return;
	101
	102	for (sdpd = mp->sdt_probes; sdpd != NULL; sdpd = sdpd->sdpd_next) {
b0d623f7 A	103	const char name = sdpd->sdpd_name, func;
b0d623f7 A	104	char *nname;
2d21ac55 A	105	int i, j;
	106	dtrace_id_t id;
	107
	108	for (prov = sdt_providers; prov->sdtp_prefix != NULL; prov++) {
b0d623f7	109	const char prefpart, prefix = prov->sdtp_prefix;
2d21ac55 A	110
	111	if ((prefpart = strstr(name, prefix))) {
	112	name = prefpart + strlen(prefix);
	113	break;
	114	}
	115	}
	116
	117	nname = kmem_alloc(len = strlen(name) + 1, KM_SLEEP);
	118
	119	for (i = 0, j = 0; name[j] != '\0'; i++) {
	120	if (name[j] == '_' && name[j + 1] == '_') {
	121	nname[i] = '-';
	122	j += 2;
	123	} else {
	124	nname[i] = name[j++];
	125	}
	126	}
	127
	128	nname[i] = '\0';
	129
	130	sdp = kmem_zalloc(sizeof (sdt_probe_t), KM_SLEEP);
	131	sdp->sdp_loadcnt = ctl->mod_loadcnt;
	132	sdp->sdp_ctl = ctl;
	133	sdp->sdp_name = nname;
	134	sdp->sdp_namelen = len;
	135	sdp->sdp_provider = prov;
	136
	137	func = sdpd->sdpd_func;
	138
	139	if (func == NULL)
	140	func = "<unknown>";
	141
	142	/*
	143	* We have our provider. Now create the probe.
	144	*/
	145	if ((id = dtrace_probe_lookup(prov->sdtp_id, modname,
	146	func, nname)) != DTRACE_IDNONE) {
	147	old = dtrace_probe_arg(prov->sdtp_id, id);
	148	ASSERT(old != NULL);
	149
	150	sdp->sdp_next = old->sdp_next;
	151	sdp->sdp_id = id;
	152	old->sdp_next = sdp;
	153	} else {
	154	sdp->sdp_id = dtrace_probe_create(prov->sdtp_id,
	155	modname, func, nname, SDT_AFRAMES, sdp);
	156
	157	mp->sdt_nprobes++;
	158	}
	159
	160	sdp->sdp_hashnext =
	161	sdt_probetab[SDT_ADDR2NDX(sdpd->sdpd_offset)];
	162	sdt_probetab[SDT_ADDR2NDX(sdpd->sdpd_offset)] = sdp;
	163
	164	sdp->sdp_patchval = SDT_PATCHVAL;
	165	sdp->sdp_patchpoint = (sdt_instr_t *)sdpd->sdpd_offset;
	166	sdp->sdp_savedval = *sdp->sdp_patchpoint;
	167	}
	168	}
	169
	170	/ARGSUSED/
	171	static void
	172	sdt_destroy(void arg, dtrace_id_t id, void parg)
	173	{
174	#pragma unused(arg,id)
175	sdt_probe_t sdp = parg, old, last, hash;
176	int ndx;
177	#if !defined(__APPLE__)
178	struct modctl *ctl = sdp->sdp_ctl;
179
180	if (ctl != NULL && ctl->mod_loadcnt == sdp->sdp_loadcnt) {
181	if ((ctl->mod_loadcnt == sdp->sdp_loadcnt &&
182	ctl->mod_loaded)) {
183	((struct module *)(ctl->mod_mp))->sdt_nprobes--;
184	}
185	}
186	#endif /* __APPLE__ */
187
188	while (sdp != NULL) {
189	old = sdp;
190
191	/*
192	* Now we need to remove this probe from the sdt_probetab.
193	*/
194	ndx = SDT_ADDR2NDX(sdp->sdp_patchpoint);
195	last = NULL;
196	hash = sdt_probetab[ndx];
197
198	while (hash != sdp) {
199	ASSERT(hash != NULL);
200	last = hash;
201	hash = hash->sdp_hashnext;
202	}
203
204	if (last != NULL) {
205	last->sdp_hashnext = sdp->sdp_hashnext;
206	} else {
207	sdt_probetab[ndx] = sdp->sdp_hashnext;
208	}
209
210	kmem_free(sdp->sdp_name, sdp->sdp_namelen);
211	sdp = sdp->sdp_next;
212	kmem_free(old, sizeof (sdt_probe_t));
213	}
214	}
215
216	/ARGSUSED/
6d2010ae	217	static int
2d21ac55 A	218	sdt_enable(void arg, dtrace_id_t id, void parg)
	219	{
	220	#pragma unused(arg,id)
	221	sdt_probe_t *sdp = parg;
	222	struct modctl *ctl = sdp->sdp_ctl;
	223
2d21ac55 A	224	ctl->mod_nenabled++;
	225
	226	/*
	227	* If this module has disappeared since we discovered its probes,
	228	* refuse to enable it.
	229	*/
	230	if (!ctl->mod_loaded) {
	231	if (sdt_verbose) {
	232	cmn_err(CE_NOTE, "sdt is failing for probe %s "
	233	"(module %s unloaded)",
	234	sdp->sdp_name, ctl->mod_modname);
	235	}
	236	goto err;
	237	}
	238
	239	/*
	240	* Now check that our modctl has the expected load count. If it
	241	* doesn't, this module must have been unloaded and reloaded -- and
	242	* we're not going to touch it.
	243	*/
	244	if (ctl->mod_loadcnt != sdp->sdp_loadcnt) {
	245	if (sdt_verbose) {
	246	cmn_err(CE_NOTE, "sdt is failing for probe %s "
	247	"(module %s reloaded)",
	248	sdp->sdp_name, ctl->mod_modname);
	249	}
	250	goto err;
	251	}
2d21ac55	252
2d21ac55 A	253	dtrace_casptr(&tempDTraceTrapHook, NULL, fbt_perfCallback);
	254	if (tempDTraceTrapHook != (perfCallback)fbt_perfCallback) {
	255	if (sdt_verbose) {
	256	cmn_err(CE_NOTE, "sdt_enable is failing for probe %s "
	257	"in module %s: tempDTraceTrapHook already occupied.",
	258	sdp->sdp_name, ctl->mod_modname);
	259	}
6d2010ae	260	return (0);
2d21ac55 A	261	}
	262
	263	while (sdp != NULL) {
	264	(void)ml_nofault_copy( (vm_offset_t)&sdp->sdp_patchval, (vm_offset_t)sdp->sdp_patchpoint,
b0d623f7	265	(vm_size_t)sizeof(sdp->sdp_patchval));
2d21ac55 A	266	sdp = sdp->sdp_next;
2d21ac55 A	267	}
6d2010ae	268
2d21ac55	269	err:
6d2010ae	270	return (0);
2d21ac55 A	271	}
	272
	273	/ARGSUSED/
	274	static void
	275	sdt_disable(void arg, dtrace_id_t id, void parg)
	276	{
	277	#pragma unused(arg,id)
	278	sdt_probe_t *sdp = parg;
2d21ac55 A	279	struct modctl *ctl = sdp->sdp_ctl;
	280
	281	ctl->mod_nenabled--;
	282
	283	if (!ctl->mod_loaded \|\| ctl->mod_loadcnt != sdp->sdp_loadcnt)
	284	goto err;
2d21ac55 A	285
	286	while (sdp != NULL) {
	287	(void)ml_nofault_copy( (vm_offset_t)&sdp->sdp_savedval, (vm_offset_t)sdp->sdp_patchpoint,
b0d623f7	288	(vm_size_t)sizeof(sdp->sdp_savedval));
2d21ac55 A	289	sdp = sdp->sdp_next;
	290	}
	291
	292	err:
	293	;
	294	}
	295
	296	static dtrace_pops_t sdt_pops = {
	297	NULL,
	298	sdt_provide_module,
	299	sdt_enable,
	300	sdt_disable,
	301	NULL,
	302	NULL,
	303	sdt_getargdesc,
b0d623f7	304	sdt_getarg,
2d21ac55 A	305	NULL,
	306	sdt_destroy
	307	};
	308
	309	/ARGSUSED/
	310	static int
	311	sdt_attach(dev_info_t *devi, ddi_attach_cmd_t cmd)
	312	{
	313	#pragma unused(cmd)
	314	sdt_provider_t *prov;
	315
	316	if (ddi_create_minor_node(devi, "sdt", S_IFCHR,
	317	0, DDI_PSEUDO, 0) == DDI_FAILURE) {
	318	cmn_err(CE_NOTE, "/dev/sdt couldn't create minor node");
	319	ddi_remove_minor_node(devi, NULL);
	320	return (DDI_FAILURE);
	321	}
	322
	323	ddi_report_dev(devi);
	324	sdt_devi = devi;
	325
	326	if (sdt_probetab_size == 0)
	327	sdt_probetab_size = SDT_PROBETAB_SIZE;
	328
	329	sdt_probetab_mask = sdt_probetab_size - 1;
	330	sdt_probetab =
	331	kmem_zalloc(sdt_probetab_size * sizeof (sdt_probe_t *), KM_SLEEP);
	332	dtrace_invop_add(sdt_invop);
	333
	334	for (prov = sdt_providers; prov->sdtp_name != NULL; prov++) {
	335	if (dtrace_register(prov->sdtp_name, prov->sdtp_attr,
	336	DTRACE_PRIV_KERNEL, NULL,
	337	&sdt_pops, prov, &prov->sdtp_id) != 0) {
	338	cmn_err(CE_WARN, "failed to register sdt provider %s",
	339	prov->sdtp_name);
	340	}
	341	}
	342
	343	return (DDI_SUCCESS);
	344	}
	345
	346	#if !defined(__APPLE__)
	347	/ARGSUSED/
	348	static int
	349	sdt_detach(dev_info_t *dip, ddi_detach_cmd_t cmd)
	350	{
	351	sdt_provider_t *prov;
	352
	353	switch (cmd) {
	354	case DDI_DETACH:
	355	break;
	356
	357	case DDI_SUSPEND:
	358	return (DDI_SUCCESS);
	359
	360	default:
	361	return (DDI_FAILURE);
	362	}
	363
	364	for (prov = sdt_providers; prov->sdtp_name != NULL; prov++) {
	365	if (prov->sdtp_id != DTRACE_PROVNONE) {
	366	if (dtrace_unregister(prov->sdtp_id) != 0)
	367	return (DDI_FAILURE);
	368
369	prov->sdtp_id = DTRACE_PROVNONE;
370	}
371	}
372
373	dtrace_invop_remove(sdt_invop);
374	kmem_free(sdt_probetab, sdt_probetab_size * sizeof (sdt_probe_t *));
375
376	return (DDI_SUCCESS);
377	}
378
379	/ARGSUSED/
380	static int
381	sdt_info(dev_info_t dip, ddi_info_cmd_t infocmd, void arg, void **result)
382	{
383	int error;
384
385	switch (infocmd) {
386	case DDI_INFO_DEVT2DEVINFO:
387	result = (void )sdt_devi;
388	error = DDI_SUCCESS;
389	break;
390	case DDI_INFO_DEVT2INSTANCE:
391	result = (void )0;
392	error = DDI_SUCCESS;
393	break;
394	default:
395	error = DDI_FAILURE;
396	}
397	return (error);
398	}
399
400	/ARGSUSED/
401	static int
402	sdt_open(dev_t devp, int flag, int otyp, cred_t cred_p)
403	{
404	return (0);
405	}
406
407	static struct cb_ops sdt_cb_ops = {
408	sdt_open, /* open */
409	nodev, /* close */
410	nulldev, /* strategy */
411	nulldev, /* print */
412	nodev, /* dump */
413	nodev, /* read */
414	nodev, /* write */
415	nodev, /* ioctl */
416	nodev, /* devmap */
417	nodev, /* mmap */
418	nodev, /* segmap */
419	nochpoll, /* poll */
420	ddi_prop_op, /* cb_prop_op */
421	0, /* streamtab */
422	D_NEW \| D_MP /* Driver compatibility flag */
423	};
424
425	static struct dev_ops sdt_ops = {
426	DEVO_REV, /* devo_rev, */
427	0, /* refcnt */
428	sdt_info, /* get_dev_info */
429	nulldev, /* identify */
430	nulldev, /* probe */
431	sdt_attach, /* attach */
432	sdt_detach, /* detach */
433	nodev, /* reset */
434	&sdt_cb_ops, /* driver operations */
435	NULL, /* bus operations */
436	nodev /* dev power */
437	};
438
439	/*
440	* Module linkage information for the kernel.
441	*/
442	static struct modldrv modldrv = {
443	&mod_driverops, /* module type (this is a pseudo driver) */
444	"Statically Defined Tracing", /* name of module */
445	&sdt_ops, /* driver ops */
446	};
447
448	static struct modlinkage modlinkage = {
449	MODREV_1,
450	(void *)&modldrv,
451	NULL
452	};
453
454	int
455	_init(void)
456	{
457	return (mod_install(&modlinkage));
458	}
459
460	int
461	_info(struct modinfo *modinfop)
462	{
463	return (mod_info(&modlinkage, modinfop));
464	}
465
466	int
467	_fini(void)
468	{
469	return (mod_remove(&modlinkage));
470	}
471	#else
472	d_open_t _sdt_open;
473
474	int _sdt_open(dev_t dev, int flags, int devtype, struct proc *p)
475	{
476	#pragma unused(dev,flags,devtype,p)
477	return 0;
478	}
479
480	#define SDT_MAJOR -24 /* let the kernel pick the device number */
481
482	/*
483	* A struct describing which functions will get invoked for certain
484	* actions.
485	*/
486	static struct cdevsw sdt_cdevsw =
487	{
488	_sdt_open, /* open */
489	eno_opcl, /* close */
490	eno_rdwrt, /* read */
491	eno_rdwrt, /* write */
492	eno_ioctl, /* ioctl */
493	(stop_fcn_t )nulldev, / stop */
494	(reset_fcn_t )nulldev, / reset */
495	NULL, /* tty's */
496	eno_select, /* select */
497	eno_mmap, /* mmap */
498	eno_strat, /* strategy */
499	eno_getc, /* getc */
500	eno_putc, /* putc */
501	0 /* type */
502	};
503
504	static int gSDTInited = 0;
505	static struct modctl g_sdt_kernctl;
506	static struct module g_sdt_mach_module;
507
2d21ac55	508	#include <mach-o/nlist.h>
b0d623f7	509	#include <libkern/kernel_mach_header.h>
2d21ac55	510
b0d623f7 A	511	#if defined(__LP64__)
	512	#define KERNEL_MAGIC MH_MAGIC_64
	513	typedef struct nlist_64 kernel_nlist_t;
	514	#else
	515	#define KERNEL_MAGIC MH_MAGIC
	516	typedef struct nlist kernel_nlist_t;
	517	#endif
2d21ac55 A	518
	519	void sdt_init( void )
	520	{
	521	if (0 == gSDTInited)
	522	{
	523	int majdevno = cdevsw_add(SDT_MAJOR, &sdt_cdevsw);
	524
	525	if (majdevno < 0) {
	526	printf("sdt_init: failed to allocate a major number!\n");
	527	gSDTInited = 0;
	528	return;
	529	}
	530
b0d623f7	531	if (KERNEL_MAGIC != _mh_execute_header.magic) {
6d2010ae A	532	g_sdt_kernctl.mod_address = (vm_address_t)NULL;
6d2010ae A	533	g_sdt_kernctl.mod_size = 0;
2d21ac55	534	} else {
6d2010ae A	535	kernel_mach_header_t *mh;
	536	struct load_command *cmd;
	537	kernel_segment_command_t orig_ts = NULL, orig_le = NULL;
	538	struct symtab_command *orig_st = NULL;
	539	kernel_nlist_t *sym = NULL;
	540	char *strings;
	541	unsigned int i;
	542
	543	g_sdt_mach_module.sdt_nprobes = 0;
	544	g_sdt_mach_module.sdt_probes = NULL;
	545
	546	g_sdt_kernctl.mod_address = (vm_address_t)&g_sdt_mach_module;
	547	g_sdt_kernctl.mod_size = 0;
	548	strncpy((char *)&(g_sdt_kernctl.mod_modname), "mach_kernel", KMOD_MAX_NAME);
	549
	550	g_sdt_kernctl.mod_next = NULL;
	551	g_sdt_kernctl.mod_stale = NULL;
	552	g_sdt_kernctl.mod_id = 0;
	553	g_sdt_kernctl.mod_loadcnt = 1;
	554	g_sdt_kernctl.mod_loaded = 1;
	555	g_sdt_kernctl.mod_flags = 0;
	556	g_sdt_kernctl.mod_nenabled = 0;
	557
	558	mh = &_mh_execute_header;
	559	cmd = (struct load_command*) &mh[1];
	560	for (i = 0; i < mh->ncmds; i++) {
	561	if (cmd->cmd == LC_SEGMENT_KERNEL) {
	562	kernel_segment_command_t orig_sg = (kernel_segment_command_t ) cmd;
	563
	564	if (LIT_STRNEQL(orig_sg->segname, SEG_TEXT))
	565	orig_ts = orig_sg;
	566	else if (LIT_STRNEQL(orig_sg->segname, SEG_LINKEDIT))
	567	orig_le = orig_sg;
	568	else if (LIT_STRNEQL(orig_sg->segname, ""))
	569	orig_ts = orig_sg; /* kexts have a single unnamed segment */
	570	}
	571	else if (cmd->cmd == LC_SYMTAB)
	572	orig_st = (struct symtab_command *) cmd;
	573
	574	cmd = (struct load_command *) ((uintptr_t) cmd + cmd->cmdsize);
	575	}
	576
	577	if ((orig_ts == NULL) \|\| (orig_st == NULL) \|\| (orig_le == NULL))
	578	return;
	579
	580	sym = (kernel_nlist_t *)(orig_le->vmaddr + orig_st->symoff - orig_le->fileoff);
	581	strings = (char *)(orig_le->vmaddr + orig_st->stroff - orig_le->fileoff);
	582
	583	for (i = 0; i < orig_st->nsyms; i++) {
	584	uint8_t n_type = sym[i].n_type & (N_TYPE \| N_EXT);
	585	char *name = strings + sym[i].n_un.n_strx;
b0d623f7	586	const char *prev_name;
2d21ac55 A	587	unsigned long best;
2d21ac55 A	588	unsigned int j;
6d2010ae A	589
	590	/* Check that the symbol is a global and that it has a name. */
	591	if (((N_SECT \| N_EXT) != n_type && (N_ABS \| N_EXT) != n_type))
	592	continue;
	593
	594	if (0 == sym[i].n_un.n_strx) /* iff a null, "", name. */
	595	continue;
	596
	597	/* Lop off omnipresent leading underscore. */
	598	if (*name == '_')
	599	name += 1;
	600
	601	if (strncmp(name, DTRACE_PROBE_PREFIX, sizeof(DTRACE_PROBE_PREFIX) - 1) == 0) {
2d21ac55 A	602	sdt_probedesc_t *sdpd = kmem_alloc(sizeof(sdt_probedesc_t), KM_SLEEP);
2d21ac55 A	603	int len = strlen(name) + 1;
6d2010ae	604
2d21ac55 A	605	sdpd->sdpd_name = kmem_alloc(len, KM_SLEEP);
2d21ac55 A	606	strncpy(sdpd->sdpd_name, name, len); /* NUL termination is ensured. */
6d2010ae	607
2d21ac55 A	608	prev_name = "<unknown>";
2d21ac55 A	609	best = 0;
b0d623f7	610
6d2010ae A	611	/*
	612	* Find the symbol immediately preceding the sdt probe site just discovered,
	613	* that symbol names the function containing the sdt probe.
	614	*/
2d21ac55	615	for (j = 0; j < orig_st->nsyms; j++) {
b0d623f7 A	616	uint8_t jn_type = sym[j].n_type & (N_TYPE \| N_EXT);
b0d623f7 A	617	char *jname = strings + sym[j].n_un.n_strx;
6d2010ae	618
b0d623f7	619	if (((N_SECT \| N_EXT) != jn_type && (N_ABS \| N_EXT) != jn_type))
2d21ac55	620	continue;
6d2010ae	621
2d21ac55 A	622	if (0 == sym[j].n_un.n_strx) /* iff a null, "", name. */
2d21ac55 A	623	continue;
6d2010ae	624
b0d623f7 A	625	if (*jname == '_')
b0d623f7 A	626	jname += 1;
6d2010ae	627
2d21ac55 A	628	if ((unsigned long )sym[i].n_value <= (unsigned long)sym[j].n_value)
2d21ac55 A	629	continue;
6d2010ae	630
2d21ac55 A	631	if ((unsigned long)sym[j].n_value > best) {
2d21ac55 A	632	best = (unsigned long)sym[j].n_value;
b0d623f7	633	prev_name = jname;
2d21ac55 A	634	}
2d21ac55 A	635	}
6d2010ae	636
2d21ac55 A	637	sdpd->sdpd_func = kmem_alloc((len = strlen(prev_name) + 1), KM_SLEEP);
2d21ac55 A	638	strncpy(sdpd->sdpd_func, prev_name, len); /* NUL termination is ensured. */
6d2010ae	639
2d21ac55	640	sdpd->sdpd_offset = (unsigned long )sym[i].n_value;
6d2010ae	641
2d21ac55 A	642	sdpd->sdpd_next = g_sdt_mach_module.sdt_probes;
	643	g_sdt_mach_module.sdt_probes = sdpd;
	644	} else {
	645	prev_name = name;
	646	}
	647	}
	648	}
6d2010ae	649
b0d623f7	650	sdt_attach( (dev_info_t *)(uintptr_t)majdevno, DDI_ATTACH );
6d2010ae	651
2d21ac55 A	652	gSDTInited = 1;
	653	} else
	654	panic("sdt_init: called twice!\n");
	655	}
b0d623f7	656
2d21ac55 A	657	#undef SDT_MAJOR
	658
	659	/ARGSUSED/
	660	void
	661	sdt_provide_module(void arg, struct modctl ctl)
	662	{
c910b4d9	663	#pragma unused(arg)
6d2010ae A	664	ASSERT(ctl != NULL);
	665	ASSERT(dtrace_kernel_symbol_mode != DTRACE_KERNEL_SYMBOLS_NEVER);
	666	lck_mtx_assert(&mod_lock, LCK_MTX_ASSERT_OWNED);
	667
	668	if (MOD_SDT_DONE(ctl))
	669	return;
	670
	671	if (MOD_IS_MACH_KERNEL(ctl)) {
	672	__sdt_provide_module(arg, &g_sdt_kernctl);
	673
	674	sdt_probedesc_t *sdpd = g_sdt_mach_module.sdt_probes;
	675	while (sdpd) {
	676	sdt_probedesc_t *this_sdpd = sdpd;
	677	kmem_free((void *)sdpd->sdpd_name, strlen(sdpd->sdpd_name) + 1);
	678	kmem_free((void *)sdpd->sdpd_func, strlen(sdpd->sdpd_func) + 1);
	679	sdpd = sdpd->sdpd_next;
	680	kmem_free((void *)this_sdpd, sizeof(sdt_probedesc_t));
	681	}
	682	g_sdt_mach_module.sdt_probes = NULL;
	683	} else {
	684	/* FIXME -- sdt in kext not yet supported */
2d21ac55	685	}
6d2010ae A	686
	687	/* Need to mark this module as completed */
	688	ctl->mod_flags \|= MODCTL_SDT_PROBES_PROVIDED;
2d21ac55 A	689	}
	690
	691	#endif /* __APPLE__ */