[apple/xnu.git] / bsd / kern / kern_core.c

/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
 * 
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this
 * file.
 * 
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
/* Copyright (c) 1991 NeXT Computer, Inc.  All rights reserved.
 *
 *	File:	bsd/kern/kern_core.c
 *
 *	This file contains machine independent code for performing core dumps.
 *
 * HISTORY
 * 16-Feb-91  Mike DeMoney (mike@next.com)
 *	Massaged into MI form from m68k/core.c.
 */

#include <mach/vm_param.h>
#include <mach/thread_status.h>

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/signalvar.h>
#include <sys/resourcevar.h>
#include <sys/namei.h>
#include <sys/vnode.h>
#include <sys/proc.h>
#include <sys/timeb.h>
#include <sys/times.h>
#include <sys/buf.h>
#include <sys/acct.h>
#include <sys/file.h>
#include <sys/uio.h>
#include <sys/kernel.h>
#include <sys/stat.h>

#include <mach-o/loader.h>
#include <mach/vm_region.h>
#include <mach/vm_statistics.h>

#include <vm/vm_kern.h>

typedef struct {
	int	flavor;			/* the number for this flavor */
	int	count;			/* count of ints in this flavor */
} mythread_state_flavor_t;

#if defined (__ppc__)

mythread_state_flavor_t thread_flavor_array[]={
		{PPC_THREAD_STATE , PPC_THREAD_STATE_COUNT},
		{PPC_FLOAT_STATE, PPC_FLOAT_STATE_COUNT}, 
		{PPC_EXCEPTION_STATE, PPC_EXCEPTION_STATE_COUNT},
		{PPC_VECTOR_STATE, PPC_VECTOR_STATE_COUNT}
		};
int mynum_flavors=4;
#elif defined (__i386__)
mythread_state_flavor_t thread_flavor_array [] = { 
		{i386_THREAD_STATE, i386_THREAD_STATE_COUNT},
		{i386_THREAD_FPSTATE, i386_THREAD_FPSTATE_COUNT},
		{i386_THREAD_EXCEPTSTATE, i386_THREAD_EXCEPTSTATE_COUNT},
		{i386_THREAD_CTHREADSTATE, i386_THREAD_CTHREADSTATE_COUNT},
		{i386_NEW_THREAD_STATE, i386_NEW_THREAD_STATE_COUNT},
		{i386_FLOAT_STATE, i386_FLOAT_STATE_COUNT},
		{i386_ISA_PORT_MAP_STATE, i386_ISA_PORT_MAP_STATE_COUNT},
		{i386_V86_ASSIST_STATE, i386_V86_ASSIST_STATE_COUNT},
		{THREAD_SYSCALL_STATE, i386_THREAD_SYSCALL_STATE_COUNT}
		};
int mynum_flavors=9;

#else
#error architecture not supported
#endif


typedef struct {
	vm_offset_t header; 
	int  hoffset;
	mythread_state_flavor_t *flavors;
	int tstate_size;
} tir_t;

collectth_state(thread_act_t th_act, tir_t *t)
{
	vm_offset_t	header;
	int  hoffset, i ;
	mythread_state_flavor_t *flavors;
	struct thread_command	*tc;
		/*
		 *	Fill in thread command structure.
		 */
		header = t->header;
		hoffset = t->hoffset;
		flavors = t->flavors;
	
		tc = (struct thread_command *) (header + hoffset);
		tc->cmd = LC_THREAD;
		tc->cmdsize = sizeof(struct thread_command)
				+ t->tstate_size;
		hoffset += sizeof(struct thread_command);
		/*
		 * Follow with a struct thread_state_flavor and
		 * the appropriate thread state struct for each
		 * thread state flavor.
		 */
		for (i = 0; i < mynum_flavors; i++) {
			*(mythread_state_flavor_t *)(header+hoffset) =
			  flavors[i];
			hoffset += sizeof(mythread_state_flavor_t);
			thread_getstatus(th_act, flavors[i].flavor,
					(thread_state_t *)(header+hoffset),
					&flavors[i].count);
			hoffset += flavors[i].count*sizeof(int);
		}

		t->hoffset = hoffset;
}
/*
 * Create a core image on the file "core".
 */
#define	MAX_TSTATE_FLAVORS	10
int
coredump(p)
	register struct proc *p;
{
	int error=0;
	register struct pcred *pcred = p->p_cred;
	register struct ucred *cred = pcred->pc_ucred;
	struct nameidata nd;
	struct vattr	vattr;
	vm_map_t	map;
	int		thread_count, segment_count;
	int		command_size, header_size, tstate_size;
	int		hoffset, foffset, vmoffset;
	vm_offset_t	header;
	struct machine_slot	*ms;
	struct mach_header	*mh;
	struct segment_command	*sc;
	struct thread_command	*tc;
	vm_size_t	size;
	vm_prot_t	prot;
	vm_prot_t	maxprot;
	vm_inherit_t	inherit;
	vm_offset_t	offset;
	int		error1;
	task_t		task;
	char		core_name[MAXCOMLEN+6];
	mythread_state_flavor_t flavors[MAX_TSTATE_FLAVORS];
	vm_size_t	nflavors,mapsize;
	int		i;
	int nesting_depth = 0;
	kern_return_t	kret;
	struct vm_region_submap_info_64 vbr;
	int vbrcount=0;
	tir_t tir1;
	struct vnode * vp;
	extern boolean_t coredumpok(vm_map_t map, vm_offset_t va);  /* temp fix */

	if (pcred->p_svuid != pcred->p_ruid || pcred->p_svgid != pcred->p_rgid)
		return (EFAULT);

	task = current_task();
	map = current_map();
	mapsize = get_vmmap_size(map);

	if (mapsize >=  p->p_rlimit[RLIMIT_CORE].rlim_cur)
		return (EFAULT);
	(void) task_suspend(task);

	sprintf(core_name, "/cores/core.%d", p->p_pid);
	NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, core_name, p);
	if(error = vn_open(&nd, O_CREAT | FWRITE, S_IRUSR ))
		return (error);
	vp = nd.ni_vp;
	
	/* Don't dump to non-regular files or files with links. */
	if (vp->v_type != VREG ||
	    VOP_GETATTR(vp, &vattr, cred, p) || vattr.va_nlink != 1) {
		error = EFAULT;
		goto out;
	}

	VATTR_NULL(&vattr);
	vattr.va_size = 0;
	VOP_LEASE(vp, p, cred, LEASE_WRITE);
	VOP_SETATTR(vp, &vattr, cred, p);
	p->p_acflag |= ACORE;

	/*
	 *	If the task is modified while dumping the file
	 *	(e.g., changes in threads or VM, the resulting
	 *	file will not necessarily be correct.
	 */

	thread_count = get_task_numacts(task);
	segment_count = get_vmmap_entries(map);	/* XXX */
	/*
	 * nflavors here is really the number of ints in flavors
	 * to meet the thread_getstatus() calling convention
	 */
#if 0
	nflavors = sizeof(flavors)/sizeof(int);
	if (thread_getstatus(current_thread(), THREAD_STATE_FLAVOR_LIST,
				(thread_state_t)(flavors),
				 &nflavors) != KERN_SUCCESS)
	    panic("core flavor list");
	/* now convert to number of flavors */
	nflavors /= sizeof(mythread_state_flavor_t)/sizeof(int);
#else
	nflavors = mynum_flavors;
	bcopy(thread_flavor_array,flavors,sizeof(thread_flavor_array));
#endif
	tstate_size = 0;
	for (i = 0; i < nflavors; i++)
		tstate_size += sizeof(mythread_state_flavor_t) +
		  (flavors[i].count * sizeof(int));

	command_size = segment_count*sizeof(struct segment_command) +
	  thread_count*sizeof(struct thread_command) +
	  tstate_size*thread_count;

	header_size = command_size + sizeof(struct mach_header);

	(void) kmem_alloc_wired(kernel_map,
				    (vm_offset_t *)&header,
				    (vm_size_t)header_size);

	/*
	 *	Set up Mach-O header.
	 */
	mh = (struct mach_header *) header;
	ms = &machine_slot[cpu_number()];
	mh->magic = MH_MAGIC;
	mh->cputype = ms->cpu_type;
	mh->cpusubtype = ms->cpu_subtype;
	mh->filetype = MH_CORE;
	mh->ncmds = segment_count + thread_count;
	mh->sizeofcmds = command_size;

	hoffset = sizeof(struct mach_header);	/* offset into header */
	foffset = round_page_32(header_size);	/* offset into file */
	vmoffset = VM_MIN_ADDRESS;		/* offset into VM */
	/* We use to check for an error, here, now we try and get 
	 * as much as we can
	 */
	while (segment_count > 0){
		/*
		 *	Get region information for next region.
		 */
		
		while (1) {
			vbrcount = VM_REGION_SUBMAP_INFO_COUNT_64;
			if((kret = vm_region_recurse_64(map, 
					&vmoffset, &size, &nesting_depth, 
					&vbr, &vbrcount)) != KERN_SUCCESS) {
				break;
			}
			if(vbr.is_submap) {
				nesting_depth++;
				continue;
			} else {
				break;
			}
		}
		if(kret != KERN_SUCCESS)
			break;

		prot = vbr.protection;
		maxprot = vbr.max_protection;
		inherit = vbr.inheritance;
		/*
		 *	Fill in segment command structure.
		 */
		sc = (struct segment_command *) (header + hoffset);
		sc->cmd = LC_SEGMENT;
		sc->cmdsize = sizeof(struct segment_command);
		/* segment name is zerod by kmem_alloc */
		sc->segname[0] = 0;
		sc->vmaddr = vmoffset;
		sc->vmsize = size;
		sc->fileoff = foffset;
		sc->filesize = size;
		sc->maxprot = maxprot;
		sc->initprot = prot;
		sc->nsects = 0;

		/*
		 *	Write segment out.  Try as hard as possible to
		 *	get read access to the data.
		 */
		if ((prot & VM_PROT_READ) == 0) {
			vm_protect(map, vmoffset, size, FALSE,
				   prot|VM_PROT_READ);
		}
		/*
		 *	Only actually perform write if we can read.
		 *	Note: if we can't read, then we end up with
		 *	a hole in the file.
		 */
		if ((maxprot & VM_PROT_READ) == VM_PROT_READ && vbr.user_tag != VM_MEMORY_IOKIT && coredumpok(map,vmoffset)) {
			error = vn_rdwr(UIO_WRITE, vp, (caddr_t)vmoffset, size, foffset,
				UIO_USERSPACE, IO_NODELOCKED|IO_UNIT, cred, (int *) 0, p);
		}

		hoffset += sizeof(struct segment_command);
		foffset += size;
		vmoffset += size;
		segment_count--;
	}

#if 0 /* [ */
	task_lock(task);
	thread = (thread_t) queue_first(&task->thread_list);
	while (thread_count > 0) {
		/*
		 *	Fill in thread command structure.
		 */
		tc = (struct thread_command *) (header + hoffset);
		tc->cmd = LC_THREAD;
		tc->cmdsize = sizeof(struct thread_command)
				+ tstate_size;
		hoffset += sizeof(struct thread_command);
		/*
		 * Follow with a struct thread_state_flavor and
		 * the appropriate thread state struct for each
		 * thread state flavor.
		 */
		for (i = 0; i < nflavors; i++) {
			*(mythread_state_flavor_t *)(header+hoffset) =
			  flavors[i];
			hoffset += sizeof(mythread_state_flavor_t);
			thread_getstatus(thread, flavors[i].flavor,
					(thread_state_t *)(header+hoffset),
					&flavors[i].count);
			hoffset += flavors[i].count*sizeof(int);
		}
		thread = (thread_t) queue_next(&thread->thread_list);
		thread_count--;
	}
	task_unlock(task);
#else /* /* 0 ][ */
	tir1.header = header;
	tir1.hoffset = hoffset;
	tir1.flavors = flavors;
	tir1.tstate_size = tstate_size;
	task_act_iterate_wth_args(task, collectth_state,&tir1);

#endif /* 0 ] */
	/*
	 *	Write out the Mach header at the beginning of the
	 *	file.
	 */
	error = vn_rdwr(UIO_WRITE, vp, (caddr_t)header, header_size, (off_t)0,
			UIO_SYSSPACE, IO_NODELOCKED|IO_UNIT, cred, (int *) 0, p);
	kmem_free(kernel_map, header, header_size);
out:
	VOP_UNLOCK(vp, 0, p);
	error1 = vn_close(vp, FWRITE, cred, p);
	if (error == 0)
		error = error1;
}
Commit	Line	Data
1c79356b A	1	/*
	2	* Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
d7e50217	6	* Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved.
1c79356b	7	*
d7e50217 A	8	* This file contains Original Code and/or Modifications of Original Code
	9	* as defined in and that are subject to the Apple Public Source License
	10	* Version 2.0 (the 'License'). You may not use this file except in
	11	* compliance with the License. Please obtain a copy of the License at
	12	* http://www.opensource.apple.com/apsl/ and read it before using this
	13	* file.
	14	*
	15	* The Original Code and all software distributed under the License are
	16	* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
1c79356b A	17	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
1c79356b A	18	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
d7e50217 A	19	* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
	20	* Please see the License for the specific language governing rights and
	21	* limitations under the License.
1c79356b A	22	*
	23	* @APPLE_LICENSE_HEADER_END@
	24	*/
	25	/* Copyright (c) 1991 NeXT Computer, Inc. All rights reserved.
	26	*
	27	* File: bsd/kern/kern_core.c
	28	*
	29	* This file contains machine independent code for performing core dumps.
	30	*
	31	* HISTORY
	32	* 16-Feb-91 Mike DeMoney (mike@next.com)
	33	* Massaged into MI form from m68k/core.c.
	34	*/
	35
	36	#include <mach/vm_param.h>
	37	#include <mach/thread_status.h>
	38
	39	#include <sys/param.h>
	40	#include <sys/systm.h>
	41	#include <sys/signalvar.h>
	42	#include <sys/resourcevar.h>
	43	#include <sys/namei.h>
	44	#include <sys/vnode.h>
	45	#include <sys/proc.h>
	46	#include <sys/timeb.h>
	47	#include <sys/times.h>
	48	#include <sys/buf.h>
	49	#include <sys/acct.h>
	50	#include <sys/file.h>
	51	#include <sys/uio.h>
	52	#include <sys/kernel.h>
	53	#include <sys/stat.h>
	54
	55	#include <mach-o/loader.h>
	56	#include <mach/vm_region.h>
765c9de3	57	#include <mach/vm_statistics.h>
1c79356b A	58
	59	#include <vm/vm_kern.h>
	60
	61	typedef struct {
	62	int flavor; /* the number for this flavor */
	63	int count; /* count of ints in this flavor */
	64	} mythread_state_flavor_t;
	65
	66	#if defined (__ppc__)
	67
	68	mythread_state_flavor_t thread_flavor_array[]={
	69	{PPC_THREAD_STATE , PPC_THREAD_STATE_COUNT},
	70	{PPC_FLOAT_STATE, PPC_FLOAT_STATE_COUNT},
d7e50217 A	71	{PPC_EXCEPTION_STATE, PPC_EXCEPTION_STATE_COUNT},
d7e50217 A	72	{PPC_VECTOR_STATE, PPC_VECTOR_STATE_COUNT}
1c79356b	73	};
d7e50217	74	int mynum_flavors=4;
1c79356b A	75	#elif defined (__i386__)
	76	mythread_state_flavor_t thread_flavor_array [] = {
	77	{i386_THREAD_STATE, i386_THREAD_STATE_COUNT},
	78	{i386_THREAD_FPSTATE, i386_THREAD_FPSTATE_COUNT},
	79	{i386_THREAD_EXCEPTSTATE, i386_THREAD_EXCEPTSTATE_COUNT},
	80	{i386_THREAD_CTHREADSTATE, i386_THREAD_CTHREADSTATE_COUNT},
	81	{i386_NEW_THREAD_STATE, i386_NEW_THREAD_STATE_COUNT},
	82	{i386_FLOAT_STATE, i386_FLOAT_STATE_COUNT},
	83	{i386_ISA_PORT_MAP_STATE, i386_ISA_PORT_MAP_STATE_COUNT},
	84	{i386_V86_ASSIST_STATE, i386_V86_ASSIST_STATE_COUNT},
	85	{THREAD_SYSCALL_STATE, i386_THREAD_SYSCALL_STATE_COUNT}
	86	};
	87	int mynum_flavors=9;
	88
	89	#else
	90	#error architecture not supported
	91	#endif
	92
	93
	94	typedef struct {
	95	vm_offset_t header;
	96	int hoffset;
	97	mythread_state_flavor_t *flavors;
	98	int tstate_size;
	99	} tir_t;
	100
	101	collectth_state(thread_act_t th_act, tir_t *t)
	102	{
	103	vm_offset_t header;
	104	int hoffset, i ;
	105	mythread_state_flavor_t *flavors;
	106	struct thread_command *tc;
	107	/*
	108	* Fill in thread command structure.
	109	*/
	110	header = t->header;
	111	hoffset = t->hoffset;
	112	flavors = t->flavors;
	113
	114	tc = (struct thread_command *) (header + hoffset);
	115	tc->cmd = LC_THREAD;
	116	tc->cmdsize = sizeof(struct thread_command)
	117	+ t->tstate_size;
	118	hoffset += sizeof(struct thread_command);
	119	/*
	120	* Follow with a struct thread_state_flavor and
	121	* the appropriate thread state struct for each
	122	* thread state flavor.
	123	*/
	124	for (i = 0; i < mynum_flavors; i++) {
	125	(mythread_state_flavor_t )(header+hoffset) =
	126	flavors[i];
	127	hoffset += sizeof(mythread_state_flavor_t);
	128	thread_getstatus(th_act, flavors[i].flavor,
	129	(thread_state_t *)(header+hoffset),
	130	&flavors[i].count);
	131	hoffset += flavors[i].count*sizeof(int);
	132	}
	133
	134	t->hoffset = hoffset;
	135	}
	136	/*
	137	* Create a core image on the file "core".
	138	*/
139	#define MAX_TSTATE_FLAVORS 10
140	int
141	coredump(p)
142	register struct proc *p;
143	{
144	int error=0;
145	register struct pcred *pcred = p->p_cred;
146	register struct ucred *cred = pcred->pc_ucred;
147	struct nameidata nd;
148	struct vattr vattr;
149	vm_map_t map;
150	int thread_count, segment_count;
151	int command_size, header_size, tstate_size;
152	int hoffset, foffset, vmoffset;
153	vm_offset_t header;
154	struct machine_slot *ms;
155	struct mach_header *mh;
156	struct segment_command *sc;
157	struct thread_command *tc;
158	vm_size_t size;
159	vm_prot_t prot;
160	vm_prot_t maxprot;
161	vm_inherit_t inherit;
162	vm_offset_t offset;
163	int error1;
164	task_t task;
165	char core_name[MAXCOMLEN+6];
166	mythread_state_flavor_t flavors[MAX_TSTATE_FLAVORS];
167	vm_size_t nflavors,mapsize;
168	int i;
169	int nesting_depth = 0;
170	kern_return_t kret;
171	struct vm_region_submap_info_64 vbr;
172	int vbrcount=0;
173	tir_t tir1;
174	struct vnode * vp;
9bccf70c	175	extern boolean_t coredumpok(vm_map_t map, vm_offset_t va); /* temp fix */
1c79356b A	176
	177	if (pcred->p_svuid != pcred->p_ruid \|\| pcred->p_svgid != pcred->p_rgid)
	178	return (EFAULT);
	179
	180	task = current_task();
	181	map = current_map();
	182	mapsize = get_vmmap_size(map);
	183
	184	if (mapsize >= p->p_rlimit[RLIMIT_CORE].rlim_cur)
	185	return (EFAULT);
	186	(void) task_suspend(task);
	187
1c79356b A	188	sprintf(core_name, "/cores/core.%d", p->p_pid);
	189	NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, core_name, p);
	190	if(error = vn_open(&nd, O_CREAT \| FWRITE, S_IRUSR ))
	191	return (error);
	192	vp = nd.ni_vp;
	193
	194	/* Don't dump to non-regular files or files with links. */
	195	if (vp->v_type != VREG \|\|
	196	VOP_GETATTR(vp, &vattr, cred, p) \|\| vattr.va_nlink != 1) {
	197	error = EFAULT;
	198	goto out;
	199	}
	200
	201	VATTR_NULL(&vattr);
	202	vattr.va_size = 0;
	203	VOP_LEASE(vp, p, cred, LEASE_WRITE);
	204	VOP_SETATTR(vp, &vattr, cred, p);
	205	p->p_acflag \|= ACORE;
	206
	207	/*
	208	* If the task is modified while dumping the file
	209	* (e.g., changes in threads or VM, the resulting
	210	* file will not necessarily be correct.
	211	*/
	212
	213	thread_count = get_task_numacts(task);
	214	segment_count = get_vmmap_entries(map); /* XXX */
	215	/*
	216	* nflavors here is really the number of ints in flavors
	217	* to meet the thread_getstatus() calling convention
	218	*/
	219	#if 0
	220	nflavors = sizeof(flavors)/sizeof(int);
	221	if (thread_getstatus(current_thread(), THREAD_STATE_FLAVOR_LIST,
	222	(thread_state_t)(flavors),
	223	&nflavors) != KERN_SUCCESS)
	224	panic("core flavor list");
	225	/* now convert to number of flavors */
	226	nflavors /= sizeof(mythread_state_flavor_t)/sizeof(int);
	227	#else
	228	nflavors = mynum_flavors;
	229	bcopy(thread_flavor_array,flavors,sizeof(thread_flavor_array));
	230	#endif
	231	tstate_size = 0;
	232	for (i = 0; i < nflavors; i++)
	233	tstate_size += sizeof(mythread_state_flavor_t) +
	234	(flavors[i].count * sizeof(int));
	235
	236	command_size = segment_count*sizeof(struct segment_command) +
	237	thread_count*sizeof(struct thread_command) +
	238	tstate_size*thread_count;
	239
	240	header_size = command_size + sizeof(struct mach_header);
	241
	242	(void) kmem_alloc_wired(kernel_map,
	243	(vm_offset_t *)&header,
	244	(vm_size_t)header_size);
	245
	246	/*
	247	* Set up Mach-O header.
	248	*/
	249	mh = (struct mach_header *) header;
	250	ms = &machine_slot[cpu_number()];
	251	mh->magic = MH_MAGIC;
252	mh->cputype = ms->cpu_type;
253	mh->cpusubtype = ms->cpu_subtype;
254	mh->filetype = MH_CORE;
255	mh->ncmds = segment_count + thread_count;
256	mh->sizeofcmds = command_size;
257
258	hoffset = sizeof(struct mach_header); /* offset into header */
d7e50217	259	foffset = round_page_32(header_size); /* offset into file */
1c79356b A	260	vmoffset = VM_MIN_ADDRESS; /* offset into VM */
	261	/* We use to check for an error, here, now we try and get
	262	* as much as we can
	263	*/
	264	while (segment_count > 0){
	265	/*
	266	* Get region information for next region.
	267	*/
	268
	269	while (1) {
	270	vbrcount = VM_REGION_SUBMAP_INFO_COUNT_64;
	271	if((kret = vm_region_recurse_64(map,
	272	&vmoffset, &size, &nesting_depth,
	273	&vbr, &vbrcount)) != KERN_SUCCESS) {
	274	break;
	275	}
	276	if(vbr.is_submap) {
	277	nesting_depth++;
	278	continue;
	279	} else {
	280	break;
	281	}
	282	}
	283	if(kret != KERN_SUCCESS)
	284	break;
	285
	286	prot = vbr.protection;
	287	maxprot = vbr.max_protection;
	288	inherit = vbr.inheritance;
	289	/*
	290	* Fill in segment command structure.
	291	*/
	292	sc = (struct segment_command *) (header + hoffset);
	293	sc->cmd = LC_SEGMENT;
	294	sc->cmdsize = sizeof(struct segment_command);
	295	/* segment name is zerod by kmem_alloc */
9bccf70c	296	sc->segname[0] = 0;
1c79356b A	297	sc->vmaddr = vmoffset;
	298	sc->vmsize = size;
	299	sc->fileoff = foffset;
	300	sc->filesize = size;
	301	sc->maxprot = maxprot;
	302	sc->initprot = prot;
	303	sc->nsects = 0;
	304
	305	/*
	306	* Write segment out. Try as hard as possible to
	307	* get read access to the data.
	308	*/
	309	if ((prot & VM_PROT_READ) == 0) {
	310	vm_protect(map, vmoffset, size, FALSE,
	311	prot\|VM_PROT_READ);
	312	}
	313	/*
	314	* Only actually perform write if we can read.
	315	* Note: if we can't read, then we end up with
	316	* a hole in the file.
	317	*/
9bccf70c	318	if ((maxprot & VM_PROT_READ) == VM_PROT_READ && vbr.user_tag != VM_MEMORY_IOKIT && coredumpok(map,vmoffset)) {
1c79356b A	319	error = vn_rdwr(UIO_WRITE, vp, (caddr_t)vmoffset, size, foffset,
	320	UIO_USERSPACE, IO_NODELOCKED\|IO_UNIT, cred, (int *) 0, p);
	321	}
	322
	323	hoffset += sizeof(struct segment_command);
	324	foffset += size;
	325	vmoffset += size;
	326	segment_count--;
	327	}
	328
	329	#if 0 /* [ */
	330	task_lock(task);
	331	thread = (thread_t) queue_first(&task->thread_list);
	332	while (thread_count > 0) {
	333	/*
	334	* Fill in thread command structure.
	335	*/
	336	tc = (struct thread_command *) (header + hoffset);
	337	tc->cmd = LC_THREAD;
	338	tc->cmdsize = sizeof(struct thread_command)
	339	+ tstate_size;
	340	hoffset += sizeof(struct thread_command);
	341	/*
	342	* Follow with a struct thread_state_flavor and
	343	* the appropriate thread state struct for each
	344	* thread state flavor.
	345	*/
	346	for (i = 0; i < nflavors; i++) {
	347	(mythread_state_flavor_t )(header+hoffset) =
	348	flavors[i];
	349	hoffset += sizeof(mythread_state_flavor_t);
	350	thread_getstatus(thread, flavors[i].flavor,
	351	(thread_state_t *)(header+hoffset),
	352	&flavors[i].count);
	353	hoffset += flavors[i].count*sizeof(int);
	354	}
	355	thread = (thread_t) queue_next(&thread->thread_list);
	356	thread_count--;
	357	}
	358	task_unlock(task);
	359	#else /* /* 0 ][ */
	360	tir1.header = header;
	361	tir1.hoffset = hoffset;
	362	tir1.flavors = flavors;
	363	tir1.tstate_size = tstate_size;
	364	task_act_iterate_wth_args(task, collectth_state,&tir1);
	365
	366	#endif /* 0 ] */
	367	/*
	368	* Write out the Mach header at the beginning of the
	369	* file.
	370	*/
	371	error = vn_rdwr(UIO_WRITE, vp, (caddr_t)header, header_size, (off_t)0,
	372	UIO_SYSSPACE, IO_NODELOCKED\|IO_UNIT, cred, (int *) 0, p);
	373	kmem_free(kernel_map, header, header_size);
	374	out:
	375	VOP_UNLOCK(vp, 0, p);
	376	error1 = vn_close(vp, FWRITE, cred, p);
	377	if (error == 0)
	378	error = error1;
	379	}