[apple/xnu.git] / bsd / dev / dtrace / fbt.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	"@(#)fbt.c	1.18	07/01/10 SMI" */

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

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

#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 <pexpert/pexpert.h>

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

#include <sys/dtrace_glue.h>

/* #include <machine/trap.h> */
struct savearea_t; /* Used anonymously */
typedef kern_return_t (*perfCallback)(int, struct savearea_t *, uintptr_t *, int);

extern perfCallback tempDTraceTrapHook;
extern kern_return_t fbt_perfCallback(int, struct savearea_t *, uintptr_t *);

#define	FBT_ADDR2NDX(addr)	((((uintptr_t)(addr)) >> 4) & fbt_probetab_mask)
#define	FBT_PROBETAB_SIZE	0x8000		/* 32k entries -- 128K total */

static dev_info_t		*fbt_devi;
static int				fbt_probetab_size;
dtrace_provider_id_t	fbt_id;
fbt_probe_t				**fbt_probetab;
int						fbt_probetab_mask;
static int				fbt_verbose = 0;

void fbt_init( void );

/*ARGSUSED*/
static void
fbt_destroy(void *arg, dtrace_id_t id, void *parg)
{
#pragma unused(arg,id)
	fbt_probe_t *fbt = parg, *next, *hash, *last;
	int ndx;

	do {
		/*
		 * Now we need to remove this probe from the fbt_probetab.
		 */
		ndx = FBT_ADDR2NDX(fbt->fbtp_patchpoint);
		last = NULL;
		hash = fbt_probetab[ndx];

		while (hash != fbt) {
			ASSERT(hash != NULL);
			last = hash;
			hash = hash->fbtp_hashnext;
		}

		if (last != NULL) {
			last->fbtp_hashnext = fbt->fbtp_hashnext;
		} else {
			fbt_probetab[ndx] = fbt->fbtp_hashnext;
		}

		next = fbt->fbtp_next;
		kmem_free(fbt, sizeof (fbt_probe_t));

		fbt = next;
	} while (fbt != NULL);
}

/*ARGSUSED*/
int
fbt_enable(void *arg, dtrace_id_t id, void *parg)
{
#pragma unused(arg,id)
	fbt_probe_t *fbt = parg;
	struct modctl *ctl = NULL;

    for (; fbt != NULL; fbt = fbt->fbtp_next) {

	ctl = fbt->fbtp_ctl;
	
	if (!ctl->mod_loaded) {
		if (fbt_verbose) {
			cmn_err(CE_NOTE, "fbt is failing for probe %s "
			    "(module %s unloaded)",
			    fbt->fbtp_name, ctl->mod_modname);
		}

		continue;
	}

	/*
	 * 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 != fbt->fbtp_loadcnt) {
		if (fbt_verbose) {
			cmn_err(CE_NOTE, "fbt is failing for probe %s "
			    "(module %s reloaded)",
			    fbt->fbtp_name, ctl->mod_modname);
		}

		continue;
	}	

	dtrace_casptr(&tempDTraceTrapHook, NULL, fbt_perfCallback);
	if (tempDTraceTrapHook != (perfCallback)fbt_perfCallback) {
		if (fbt_verbose) {
			cmn_err(CE_NOTE, "fbt_enable is failing for probe %s "
			    "in module %s: tempDTraceTrapHook already occupied.",
			    fbt->fbtp_name, ctl->mod_modname);
		}
		continue;
	}

	if (fbt->fbtp_currentval != fbt->fbtp_patchval) {
		(void)ml_nofault_copy( (vm_offset_t)&fbt->fbtp_patchval, (vm_offset_t)fbt->fbtp_patchpoint, 
								sizeof(fbt->fbtp_patchval));
                fbt->fbtp_currentval = fbt->fbtp_patchval;
		ctl->mod_nenabled++;
	}

    }
    
    dtrace_membar_consumer();
    
    return (0);
}

/*ARGSUSED*/
static void
fbt_disable(void *arg, dtrace_id_t id, void *parg)
{
#pragma unused(arg,id)
	fbt_probe_t *fbt = parg;
	struct modctl *ctl = NULL;

	for (; fbt != NULL; fbt = fbt->fbtp_next) {
	    ctl = fbt->fbtp_ctl;
	    
	    if (!ctl->mod_loaded || (ctl->mod_loadcnt != fbt->fbtp_loadcnt))
		continue;

	    if (fbt->fbtp_currentval != fbt->fbtp_savedval) {
		(void)ml_nofault_copy( (vm_offset_t)&fbt->fbtp_savedval, (vm_offset_t)fbt->fbtp_patchpoint, 
								sizeof(fbt->fbtp_savedval));
		fbt->fbtp_currentval = fbt->fbtp_savedval;
		ASSERT(ctl->mod_nenabled > 0);
		ctl->mod_nenabled--;
	    }
	}
	dtrace_membar_consumer();
}

/*ARGSUSED*/
static void
fbt_suspend(void *arg, dtrace_id_t id, void *parg)
{
#pragma unused(arg,id)
	fbt_probe_t *fbt = parg;
	struct modctl *ctl = NULL;

	for (; fbt != NULL; fbt = fbt->fbtp_next) {
	    ctl = fbt->fbtp_ctl;

	    ASSERT(ctl->mod_nenabled > 0);
	    if (!ctl->mod_loaded || (ctl->mod_loadcnt != fbt->fbtp_loadcnt))
		continue;

	    (void)ml_nofault_copy( (vm_offset_t)&fbt->fbtp_savedval, (vm_offset_t)fbt->fbtp_patchpoint, 
								sizeof(fbt->fbtp_savedval));
	    fbt->fbtp_currentval = fbt->fbtp_savedval;
	}
	
	dtrace_membar_consumer();
}

/*ARGSUSED*/
static void
fbt_resume(void *arg, dtrace_id_t id, void *parg)
{
#pragma unused(arg,id)
	fbt_probe_t *fbt = parg;
	struct modctl *ctl = NULL;

	for (; fbt != NULL; fbt = fbt->fbtp_next) {
	    ctl = fbt->fbtp_ctl;

	    ASSERT(ctl->mod_nenabled > 0);
	    if (!ctl->mod_loaded || (ctl->mod_loadcnt != fbt->fbtp_loadcnt))
		continue;
	
	    dtrace_casptr(&tempDTraceTrapHook, NULL, fbt_perfCallback);
	    if (tempDTraceTrapHook != (perfCallback)fbt_perfCallback) {
		if (fbt_verbose) {
			cmn_err(CE_NOTE, "fbt_resume is failing for probe %s "
			    "in module %s: tempDTraceTrapHook already occupied.",
			    fbt->fbtp_name, ctl->mod_modname);
		}
		return;
	    }
	
	    (void)ml_nofault_copy( (vm_offset_t)&fbt->fbtp_patchval, (vm_offset_t)fbt->fbtp_patchpoint, 
								sizeof(fbt->fbtp_patchval));
  	    fbt->fbtp_currentval = fbt->fbtp_patchval;
	}
	
	dtrace_membar_consumer();
}

#if !defined(__APPLE__)
/*ARGSUSED*/
static void
fbt_getargdesc(void *arg, dtrace_id_t id, void *parg, dtrace_argdesc_t *desc)
{
	fbt_probe_t *fbt = parg;
	struct modctl *ctl = fbt->fbtp_ctl;
	struct module *mp = ctl->mod_mp;
	ctf_file_t *fp = NULL, *pfp;
	ctf_funcinfo_t f;
	int error;
	ctf_id_t argv[32], type;
	int argc = sizeof (argv) / sizeof (ctf_id_t);
	const char *parent;

	if (!ctl->mod_loaded || (ctl->mod_loadcnt != fbt->fbtp_loadcnt))
		goto err;

	if (fbt->fbtp_roffset != 0 && desc->dtargd_ndx == 0) {
		(void) strlcpy(desc->dtargd_native, "int",
			       sizeof(desc->dtargd_native));
		return;
	}

	if ((fp = ctf_modopen(mp, &error)) == NULL) {
		/*
		 * We have no CTF information for this module -- and therefore
		 * no args[] information.
		 */
		goto err;
	}

	/*
	 * If we have a parent container, we must manually import it.
	 */
	if ((parent = ctf_parent_name(fp)) != NULL) {
		struct modctl *mp = &modules;
		struct modctl *mod = NULL;

		/*
		 * We must iterate over all modules to find the module that
		 * is our parent.
		 */
		do {
			if (strcmp(mp->mod_modname, parent) == 0) {
				mod = mp;
				break;
			}
		} while ((mp = mp->mod_next) != &modules);

		if (mod == NULL)
			goto err;

		if ((pfp = ctf_modopen(mod->mod_mp, &error)) == NULL) {
			goto err;
		}

		if (ctf_import(fp, pfp) != 0) {
			ctf_close(pfp);
			goto err;
		}

		ctf_close(pfp);
	}

	if (ctf_func_info(fp, fbt->fbtp_symndx, &f) == CTF_ERR)
		goto err;

	if (fbt->fbtp_roffset != 0) {
		if (desc->dtargd_ndx > 1)
			goto err;

		ASSERT(desc->dtargd_ndx == 1);
		type = f.ctc_return;
	} else {
		if (desc->dtargd_ndx + 1 > f.ctc_argc)
			goto err;

		if (ctf_func_args(fp, fbt->fbtp_symndx, argc, argv) == CTF_ERR)
			goto err;

		type = argv[desc->dtargd_ndx];
	}

	if (ctf_type_name(fp, type, desc->dtargd_native,
	    DTRACE_ARGTYPELEN) != NULL) {
		ctf_close(fp);
		return;
	}
err:
	if (fp != NULL)
		ctf_close(fp);

	desc->dtargd_ndx = DTRACE_ARGNONE;
}
#endif /* __APPLE__ */

static dtrace_pattr_t fbt_attr = {
{ DTRACE_STABILITY_EVOLVING, DTRACE_STABILITY_EVOLVING, DTRACE_CLASS_ISA },
{ DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_UNKNOWN },
{ DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_UNKNOWN },
{ DTRACE_STABILITY_EVOLVING, DTRACE_STABILITY_EVOLVING, DTRACE_CLASS_ISA },
{ DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_ISA },
};

static dtrace_pops_t fbt_pops = {
	NULL,
	fbt_provide_module,
	fbt_enable,
	fbt_disable,
	fbt_suspend,
	fbt_resume,
#if !defined(__APPLE__)
	fbt_getargdesc,
#else
	NULL, /* FIXME: where to look for xnu? */
#endif /* __APPLE__ */
	NULL,
	NULL,
	fbt_destroy
};

static void
fbt_cleanup(dev_info_t *devi)
{
	dtrace_invop_remove(fbt_invop);
	ddi_remove_minor_node(devi, NULL);
	kmem_free(fbt_probetab, fbt_probetab_size * sizeof (fbt_probe_t *));
	fbt_probetab = NULL;
	fbt_probetab_mask = 0;
}

static int
fbt_attach(dev_info_t *devi, ddi_attach_cmd_t cmd)
{
	switch (cmd) {
	case DDI_ATTACH:
		break;
	case DDI_RESUME:
		return (DDI_SUCCESS);
	default:
		return (DDI_FAILURE);
	}

	if (fbt_probetab_size == 0)
		fbt_probetab_size = FBT_PROBETAB_SIZE;

	fbt_probetab_mask = fbt_probetab_size - 1;
	fbt_probetab =
	    kmem_zalloc(fbt_probetab_size * sizeof (fbt_probe_t *), KM_SLEEP);

	dtrace_invop_add(fbt_invop);

#if !defined(__APPLE__)
	if (ddi_create_minor_node(devi, "fbt", S_IFCHR, 0,
	    DDI_PSEUDO, NULL) == DDI_FAILURE ||
	    dtrace_register("fbt", &fbt_attr, DTRACE_PRIV_KERNEL, NULL,
	    &fbt_pops, NULL, &fbt_id) != 0) {
		fbt_cleanup(devi);
		return (DDI_FAILURE);
	}
#else
	if (ddi_create_minor_node(devi, "fbt", S_IFCHR, 0,
	    DDI_PSEUDO, 0) == DDI_FAILURE ||
	    dtrace_register("fbt", &fbt_attr, DTRACE_PRIV_KERNEL, NULL,
	    &fbt_pops, NULL, &fbt_id) != 0) {
		fbt_cleanup(devi);
		return (DDI_FAILURE);
	}
#endif /* __APPLE__ */

	ddi_report_dev(devi);
	fbt_devi = devi;

	return (DDI_SUCCESS);
}

static d_open_t _fbt_open;

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

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

/*
 * A struct describing which functions will get invoked for certain
 * actions.
 */
static struct cdevsw fbt_cdevsw =
{
	_fbt_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 */
};

int gIgnoreFBTBlacklist = 0;
static int gFBTInited = 0;
#undef kmem_alloc /* from its binding to dt_kmem_alloc glue */
#undef kmem_free /* from its binding to dt_kmem_free glue */
#include <vm/vm_kern.h>

void
fbt_init( void )
{
	if (0 == gFBTInited)
	{
		int majdevno = cdevsw_add(FBT_MAJOR, &fbt_cdevsw);
		
		if (majdevno < 0) {
			printf("fbt_init: failed to allocate a major number!\n");
			return;
		}
		
		PE_parse_boot_argn("IgnoreFBTBlacklist", &gIgnoreFBTBlacklist, sizeof (gIgnoreFBTBlacklist));

		fbt_attach( (dev_info_t	*)(uintptr_t)majdevno, DDI_ATTACH );
		
		gFBTInited = 1; /* Ensure this initialization occurs just one time. */
	}
	else
		panic("fbt_init: called twice!\n");
}
#undef FBT_MAJOR
Commit	Line	Data
2d21ac55 A	1	/*
	2	* CDDL HEADER START
	3	*
	4	* The contents of this file are subject to the terms of the
b0d623f7 A	5	* Common Development and Distribution License (the "License").
b0d623f7 A	6	* You may not use this file except in compliance with the License.
2d21ac55 A	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 "@(#)fbt.c 1.18 07/01/10 SMI" */
2d21ac55 A	27
	28	#ifdef KERNEL
	29	#ifndef _KERNEL
	30	#define _KERNEL /* Solaris vs. Darwin */
	31	#endif
	32	#endif
	33
	34	#include <mach-o/loader.h>
b0d623f7	35	#include <libkern/kernel_mach_header.h>
2d21ac55 A	36
	37	#include <sys/param.h>
	38	#include <sys/systm.h>
	39	#include <sys/errno.h>
	40	#include <sys/stat.h>
	41	#include <sys/ioctl.h>
	42	#include <sys/conf.h>
	43	#include <sys/fcntl.h>
	44	#include <miscfs/devfs/devfs.h>
	45	#include <pexpert/pexpert.h>
	46
	47	#include <sys/dtrace.h>
	48	#include <sys/dtrace_impl.h>
	49	#include <sys/fbt.h>
	50
	51	#include <sys/dtrace_glue.h>
	52
	53	/* #include <machine/trap.h> */
	54	struct savearea_t; /* Used anonymously */
6d2010ae	55	typedef kern_return_t (perfCallback)(int, struct savearea_t , uintptr_t *, int);
2d21ac55	56
2d21ac55	57	extern perfCallback tempDTraceTrapHook;
6d2010ae	58	extern kern_return_t fbt_perfCallback(int, struct savearea_t , uintptr_t );
2d21ac55 A	59
	60	#define FBT_ADDR2NDX(addr) ((((uintptr_t)(addr)) >> 4) & fbt_probetab_mask)
	61	#define FBT_PROBETAB_SIZE 0x8000 /* 32k entries -- 128K total */
	62
	63	static dev_info_t *fbt_devi;
	64	static int fbt_probetab_size;
	65	dtrace_provider_id_t fbt_id;
	66	fbt_probe_t **fbt_probetab;
	67	int fbt_probetab_mask;
	68	static int fbt_verbose = 0;
	69
	70	void fbt_init( void );
	71
	72	/ARGSUSED/
	73	static void
	74	fbt_destroy(void arg, dtrace_id_t id, void parg)
	75	{
	76	#pragma unused(arg,id)
	77	fbt_probe_t fbt = parg, next, hash, last;
	78	int ndx;
	79
	80	do {
	81	/*
	82	* Now we need to remove this probe from the fbt_probetab.
	83	*/
	84	ndx = FBT_ADDR2NDX(fbt->fbtp_patchpoint);
	85	last = NULL;
	86	hash = fbt_probetab[ndx];
	87
	88	while (hash != fbt) {
	89	ASSERT(hash != NULL);
	90	last = hash;
	91	hash = hash->fbtp_hashnext;
	92	}
	93
	94	if (last != NULL) {
	95	last->fbtp_hashnext = fbt->fbtp_hashnext;
	96	} else {
	97	fbt_probetab[ndx] = fbt->fbtp_hashnext;
	98	}
	99
	100	next = fbt->fbtp_next;
	101	kmem_free(fbt, sizeof (fbt_probe_t));
	102
	103	fbt = next;
	104	} while (fbt != NULL);
	105	}
	106
	107	/ARGSUSED/
6d2010ae	108	int
2d21ac55 A	109	fbt_enable(void arg, dtrace_id_t id, void parg)
	110	{
	111	#pragma unused(arg,id)
	112	fbt_probe_t *fbt = parg;
6d2010ae A	113	struct modctl *ctl = NULL;
	114
	115	for (; fbt != NULL; fbt = fbt->fbtp_next) {
2d21ac55	116
6d2010ae A	117	ctl = fbt->fbtp_ctl;
	118
	119	if (!ctl->mod_loaded) {
2d21ac55	120	if (fbt_verbose) {
6d2010ae A	121	cmn_err(CE_NOTE, "fbt is failing for probe %s "
6d2010ae A	122	"(module %s unloaded)",
2d21ac55 A	123	fbt->fbtp_name, ctl->mod_modname);
2d21ac55 A	124	}
6d2010ae A	125
6d2010ae A	126	continue;
2d21ac55	127	}
6d2010ae A	128
	129	/*
	130	* Now check that our modctl has the expected load count. If it
	131	* doesn't, this module must have been unloaded and reloaded -- and
	132	* we're not going to touch it.
	133	*/
	134	if (ctl->mod_loadcnt != fbt->fbtp_loadcnt) {
	135	if (fbt_verbose) {
	136	cmn_err(CE_NOTE, "fbt is failing for probe %s "
	137	"(module %s reloaded)",
	138	fbt->fbtp_name, ctl->mod_modname);
	139	}
	140
	141	continue;
	142	}
	143
2d21ac55 A	144	dtrace_casptr(&tempDTraceTrapHook, NULL, fbt_perfCallback);
	145	if (tempDTraceTrapHook != (perfCallback)fbt_perfCallback) {
	146	if (fbt_verbose) {
	147	cmn_err(CE_NOTE, "fbt_enable is failing for probe %s "
	148	"in module %s: tempDTraceTrapHook already occupied.",
	149	fbt->fbtp_name, ctl->mod_modname);
	150	}
6d2010ae	151	continue;
2d21ac55 A	152	}
2d21ac55 A	153
6d2010ae	154	if (fbt->fbtp_currentval != fbt->fbtp_patchval) {
2d21ac55 A	155	(void)ml_nofault_copy( (vm_offset_t)&fbt->fbtp_patchval, (vm_offset_t)fbt->fbtp_patchpoint,
2d21ac55 A	156	sizeof(fbt->fbtp_patchval));
6d2010ae A	157	fbt->fbtp_currentval = fbt->fbtp_patchval;
	158	ctl->mod_nenabled++;
	159	}
	160
	161	}
	162
	163	dtrace_membar_consumer();
	164
	165	return (0);
2d21ac55 A	166	}
	167
	168	/ARGSUSED/
	169	static void
	170	fbt_disable(void arg, dtrace_id_t id, void parg)
	171	{
	172	#pragma unused(arg,id)
	173	fbt_probe_t *fbt = parg;
6d2010ae A	174	struct modctl *ctl = NULL;
	175
	176	for (; fbt != NULL; fbt = fbt->fbtp_next) {
	177	ctl = fbt->fbtp_ctl;
	178
	179	if (!ctl->mod_loaded \|\| (ctl->mod_loadcnt != fbt->fbtp_loadcnt))
	180	continue;
2d21ac55	181
6d2010ae	182	if (fbt->fbtp_currentval != fbt->fbtp_savedval) {
2d21ac55 A	183	(void)ml_nofault_copy( (vm_offset_t)&fbt->fbtp_savedval, (vm_offset_t)fbt->fbtp_patchpoint,
2d21ac55 A	184	sizeof(fbt->fbtp_savedval));
6d2010ae A	185	fbt->fbtp_currentval = fbt->fbtp_savedval;
	186	ASSERT(ctl->mod_nenabled > 0);
	187	ctl->mod_nenabled--;
	188	}
	189	}
2d21ac55 A	190	dtrace_membar_consumer();
	191	}
	192
	193	/ARGSUSED/
	194	static void
	195	fbt_suspend(void arg, dtrace_id_t id, void parg)
	196	{
	197	#pragma unused(arg,id)
	198	fbt_probe_t *fbt = parg;
6d2010ae	199	struct modctl *ctl = NULL;
2d21ac55	200
6d2010ae A	201	for (; fbt != NULL; fbt = fbt->fbtp_next) {
	202	ctl = fbt->fbtp_ctl;
	203
	204	ASSERT(ctl->mod_nenabled > 0);
	205	if (!ctl->mod_loaded \|\| (ctl->mod_loadcnt != fbt->fbtp_loadcnt))
	206	continue;
	207
	208	(void)ml_nofault_copy( (vm_offset_t)&fbt->fbtp_savedval, (vm_offset_t)fbt->fbtp_patchpoint,
2d21ac55	209	sizeof(fbt->fbtp_savedval));
6d2010ae A	210	fbt->fbtp_currentval = fbt->fbtp_savedval;
	211	}
	212
2d21ac55 A	213	dtrace_membar_consumer();
	214	}
	215
	216	/ARGSUSED/
	217	static void
	218	fbt_resume(void arg, dtrace_id_t id, void parg)
	219	{
	220	#pragma unused(arg,id)
	221	fbt_probe_t *fbt = parg;
6d2010ae	222	struct modctl *ctl = NULL;
2d21ac55	223
6d2010ae A	224	for (; fbt != NULL; fbt = fbt->fbtp_next) {
	225	ctl = fbt->fbtp_ctl;
	226
	227	ASSERT(ctl->mod_nenabled > 0);
	228	if (!ctl->mod_loaded \|\| (ctl->mod_loadcnt != fbt->fbtp_loadcnt))
	229	continue;
2d21ac55	230
6d2010ae A	231	dtrace_casptr(&tempDTraceTrapHook, NULL, fbt_perfCallback);
6d2010ae A	232	if (tempDTraceTrapHook != (perfCallback)fbt_perfCallback) {
2d21ac55 A	233	if (fbt_verbose) {
	234	cmn_err(CE_NOTE, "fbt_resume is failing for probe %s "
	235	"in module %s: tempDTraceTrapHook already occupied.",
	236	fbt->fbtp_name, ctl->mod_modname);
	237	}
	238	return;
6d2010ae	239	}
2d21ac55	240
6d2010ae	241	(void)ml_nofault_copy( (vm_offset_t)&fbt->fbtp_patchval, (vm_offset_t)fbt->fbtp_patchpoint,
2d21ac55	242	sizeof(fbt->fbtp_patchval));
6d2010ae A	243	fbt->fbtp_currentval = fbt->fbtp_patchval;
	244	}
	245
2d21ac55 A	246	dtrace_membar_consumer();
	247	}
	248
	249	#if !defined(__APPLE__)
	250	/ARGSUSED/
	251	static void
	252	fbt_getargdesc(void arg, dtrace_id_t id, void parg, dtrace_argdesc_t *desc)
	253	{
	254	fbt_probe_t *fbt = parg;
	255	struct modctl *ctl = fbt->fbtp_ctl;
	256	struct module *mp = ctl->mod_mp;
	257	ctf_file_t fp = NULL, pfp;
	258	ctf_funcinfo_t f;
	259	int error;
	260	ctf_id_t argv[32], type;
	261	int argc = sizeof (argv) / sizeof (ctf_id_t);
	262	const char *parent;
	263
	264	if (!ctl->mod_loaded \|\| (ctl->mod_loadcnt != fbt->fbtp_loadcnt))
	265	goto err;
	266
	267	if (fbt->fbtp_roffset != 0 && desc->dtargd_ndx == 0) {
	268	(void) strlcpy(desc->dtargd_native, "int",
	269	sizeof(desc->dtargd_native));
	270	return;
	271	}
	272
	273	if ((fp = ctf_modopen(mp, &error)) == NULL) {
	274	/*
	275	* We have no CTF information for this module -- and therefore
	276	* no args[] information.
	277	*/
	278	goto err;
	279	}
	280
	281	/*
	282	* If we have a parent container, we must manually import it.
	283	*/
	284	if ((parent = ctf_parent_name(fp)) != NULL) {
b0d623f7 A	285	struct modctl *mp = &modules;
b0d623f7 A	286	struct modctl *mod = NULL;
2d21ac55 A	287
	288	/*
	289	* We must iterate over all modules to find the module that
	290	* is our parent.
	291	*/
b0d623f7 A	292	do {
	293	if (strcmp(mp->mod_modname, parent) == 0) {
	294	mod = mp;
2d21ac55	295	break;
b0d623f7 A	296	}
b0d623f7 A	297	} while ((mp = mp->mod_next) != &modules);
2d21ac55 A	298
	299	if (mod == NULL)
	300	goto err;
	301
b0d623f7	302	if ((pfp = ctf_modopen(mod->mod_mp, &error)) == NULL) {
2d21ac55	303	goto err;
b0d623f7	304	}
2d21ac55 A	305
	306	if (ctf_import(fp, pfp) != 0) {
	307	ctf_close(pfp);
	308	goto err;
	309	}
	310
	311	ctf_close(pfp);
	312	}
	313
	314	if (ctf_func_info(fp, fbt->fbtp_symndx, &f) == CTF_ERR)
	315	goto err;
	316
	317	if (fbt->fbtp_roffset != 0) {
	318	if (desc->dtargd_ndx > 1)
	319	goto err;
	320
	321	ASSERT(desc->dtargd_ndx == 1);
	322	type = f.ctc_return;
	323	} else {
	324	if (desc->dtargd_ndx + 1 > f.ctc_argc)
	325	goto err;
	326
	327	if (ctf_func_args(fp, fbt->fbtp_symndx, argc, argv) == CTF_ERR)
	328	goto err;
	329
	330	type = argv[desc->dtargd_ndx];
	331	}
	332
	333	if (ctf_type_name(fp, type, desc->dtargd_native,
	334	DTRACE_ARGTYPELEN) != NULL) {
	335	ctf_close(fp);
	336	return;
	337	}
	338	err:
	339	if (fp != NULL)
	340	ctf_close(fp);
	341
	342	desc->dtargd_ndx = DTRACE_ARGNONE;
	343	}
	344	#endif /* __APPLE__ */
	345
	346	static dtrace_pattr_t fbt_attr = {
	347	{ DTRACE_STABILITY_EVOLVING, DTRACE_STABILITY_EVOLVING, DTRACE_CLASS_ISA },
	348	{ DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_UNKNOWN },
	349	{ DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_UNKNOWN },
	350	{ DTRACE_STABILITY_EVOLVING, DTRACE_STABILITY_EVOLVING, DTRACE_CLASS_ISA },
	351	{ DTRACE_STABILITY_PRIVATE, DTRACE_STABILITY_PRIVATE, DTRACE_CLASS_ISA },
	352	};
	353
	354	static dtrace_pops_t fbt_pops = {
	355	NULL,
	356	fbt_provide_module,
	357	fbt_enable,
	358	fbt_disable,
	359	fbt_suspend,
	360	fbt_resume,
	361	#if !defined(__APPLE__)
	362	fbt_getargdesc,
	363	#else
b0d623f7	364	NULL, /* FIXME: where to look for xnu? */
2d21ac55 A	365	#endif /* __APPLE__ */
	366	NULL,
	367	NULL,
	368	fbt_destroy
	369	};
	370
	371	static void
	372	fbt_cleanup(dev_info_t *devi)
	373	{
	374	dtrace_invop_remove(fbt_invop);
	375	ddi_remove_minor_node(devi, NULL);
	376	kmem_free(fbt_probetab, fbt_probetab_size * sizeof (fbt_probe_t *));
	377	fbt_probetab = NULL;
	378	fbt_probetab_mask = 0;
	379	}
	380
	381	static int
	382	fbt_attach(dev_info_t *devi, ddi_attach_cmd_t cmd)
	383	{
	384	switch (cmd) {
	385	case DDI_ATTACH:
	386	break;
	387	case DDI_RESUME:
	388	return (DDI_SUCCESS);
	389	default:
	390	return (DDI_FAILURE);
	391	}
	392
	393	if (fbt_probetab_size == 0)
	394	fbt_probetab_size = FBT_PROBETAB_SIZE;
	395
	396	fbt_probetab_mask = fbt_probetab_size - 1;
	397	fbt_probetab =
	398	kmem_zalloc(fbt_probetab_size * sizeof (fbt_probe_t *), KM_SLEEP);
	399
	400	dtrace_invop_add(fbt_invop);
	401
b0d623f7	402	#if !defined(__APPLE__)
2d21ac55 A	403	if (ddi_create_minor_node(devi, "fbt", S_IFCHR, 0,
	404	DDI_PSEUDO, NULL) == DDI_FAILURE \|\|
	405	dtrace_register("fbt", &fbt_attr, DTRACE_PRIV_KERNEL, NULL,
	406	&fbt_pops, NULL, &fbt_id) != 0) {
	407	fbt_cleanup(devi);
	408	return (DDI_FAILURE);
	409	}
b0d623f7 A	410	#else
	411	if (ddi_create_minor_node(devi, "fbt", S_IFCHR, 0,
	412	DDI_PSEUDO, 0) == DDI_FAILURE \|\|
	413	dtrace_register("fbt", &fbt_attr, DTRACE_PRIV_KERNEL, NULL,
	414	&fbt_pops, NULL, &fbt_id) != 0) {
	415	fbt_cleanup(devi);
	416	return (DDI_FAILURE);
	417	}
	418	#endif /* __APPLE__ */
2d21ac55 A	419
	420	ddi_report_dev(devi);
	421	fbt_devi = devi;
	422
	423	return (DDI_SUCCESS);
	424	}
	425
	426	static d_open_t _fbt_open;
	427
	428	static int
	429	_fbt_open(dev_t dev, int flags, int devtype, struct proc *p)
	430	{
	431	#pragma unused(dev,flags,devtype,p)
	432	return 0;
	433	}
	434
	435	#define FBT_MAJOR -24 /* let the kernel pick the device number */
	436
	437	/*
	438	* A struct describing which functions will get invoked for certain
	439	* actions.
	440	*/
	441	static struct cdevsw fbt_cdevsw =
	442	{
	443	_fbt_open, /* open */
	444	eno_opcl, /* close */
	445	eno_rdwrt, /* read */
	446	eno_rdwrt, /* write */
	447	eno_ioctl, /* ioctl */
	448	(stop_fcn_t )nulldev, / stop */
	449	(reset_fcn_t )nulldev, / reset */
	450	NULL, /* tty's */
	451	eno_select, /* select */
	452	eno_mmap, /* mmap */
	453	eno_strat, /* strategy */
	454	eno_getc, /* getc */
	455	eno_putc, /* putc */
	456	0 /* type */
	457	};
	458
6d2010ae A	459	int gIgnoreFBTBlacklist = 0;
6d2010ae A	460	static int gFBTInited = 0;
2d21ac55 A	461	#undef kmem_alloc /* from its binding to dt_kmem_alloc glue */
	462	#undef kmem_free /* from its binding to dt_kmem_free glue */
	463	#include <vm/vm_kern.h>
	464
	465	void
	466	fbt_init( void )
	467	{
6d2010ae	468	if (0 == gFBTInited)
2d21ac55 A	469	{
2d21ac55 A	470	int majdevno = cdevsw_add(FBT_MAJOR, &fbt_cdevsw);
2d21ac55 A	471
	472	if (majdevno < 0) {
	473	printf("fbt_init: failed to allocate a major number!\n");
	474	return;
	475	}
6d2010ae A	476
6d2010ae A	477	PE_parse_boot_argn("IgnoreFBTBlacklist", &gIgnoreFBTBlacklist, sizeof (gIgnoreFBTBlacklist));
2d21ac55	478
b0d623f7	479	fbt_attach( (dev_info_t *)(uintptr_t)majdevno, DDI_ATTACH );
6d2010ae A	480
6d2010ae A	481	gFBTInited = 1; /* Ensure this initialization occurs just one time. */
2d21ac55 A	482	}
2d21ac55 A	483	else
6d2010ae	484	panic("fbt_init: called twice!\n");
2d21ac55 A	485	}
2d21ac55 A	486	#undef FBT_MAJOR