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

/*
 * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * The contents of this file constitute Original Code as defined in and
 * are subject to the Apple Public Source License Version 1.1 (the
 * "License").  You may not use this file except in compliance with the
 * License.  Please obtain a copy of the License at
 * http://www.apple.com/publicsource and read it before using this file.
 * 
 * This 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 OR NON-INFRINGEMENT.  Please see the
 * License for the specific language governing rights and limitations
 * under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
/* Copyright (c) 1998 Apple Computer, Inc.  All rights reserved.
 *
 *	File:	bsd/kern/kern_symfile.c
 *
 *	This file contains creates a dummy symbol file for mach_kernel based on
 *      the symbol table information passed by the SecondaryLoader/PlatformExpert.
 *      This allows us to correctly link other executables (drivers, etc) against the 
 *      the kernel in cases where the kernel image on the root device does not match
 *      the live kernel. This can occur during net-booting where the actual kernel
 *      image is obtained from the network via tftp rather than the root
 *      device.
 *
 *      If a symbol table is available, then the file /mach.sym will be created
 *      containing a Mach Header and a LC_SYMTAB load command followed by the
 *      the symbol table data for mach_kernel.
 *
 * HISTORY
 * 
 *	.
 */

#include <mach/vm_param.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-o/nlist.h>

#include <vm/vm_kern.h>

extern unsigned char 	rootdevice[];
extern struct mach_header _mh_execute_header;

static int kernel_symfile_opened = 0;
static int error_code = 0;

extern int  IODTGetLoaderInfo(char *key, void **infoAddr, int *infoSize);
extern void IODTFreeLoaderInfo(char *key, void *infoAddr, int infoSize);

/*
 * 
 */
static int output_kernel_symbols(struct proc *p)
{
    struct vnode		*vp;
    struct pcred 		*pcred = p->p_cred;
    struct ucred 		*cred = pcred->pc_ucred;
    struct nameidata 		nd;
    struct vattr		vattr;
    struct load_command		*cmd;
    struct mach_header		*orig_mh, *mh;
    struct segment_command	*orig_ds, *orig_ts, *orig_le, *sg;
    struct section		*se, *const_text;
    struct symtab_command	*st, *orig_st;
    struct nlist		*sym;
    vm_size_t			orig_mhsize, orig_st_size;
    vm_offset_t			header;
    vm_size_t			header_size;
    int				error, error1;
    int				i, j;
    caddr_t			addr;
    vm_offset_t			offset;
    int				rc_mh, rc_sc;

    error = EFAULT;

    vp		= NULL;
    header	= NULL;
    orig_mh	= NULL;
    orig_st	= NULL;
    
    // Dispose of unnecessary gumf, the booter doesn't need to load these
    rc_mh = IODTGetLoaderInfo("Kernel-__HEADER",
				(void **)&orig_mh, &orig_mhsize);
    if (rc_mh && orig_mh)
	IODTFreeLoaderInfo("Kernel-__HEADER",
			    (void *)orig_mh, round_page(orig_mhsize));

    rc_sc = IODTGetLoaderInfo("Kernel-__SYMTAB",
				(void **) &orig_st, &orig_st_size);
    if (rc_sc && orig_st)
	IODTFreeLoaderInfo("Kernel-__SYMTAB",
			    (void *)orig_st, round_page(orig_st_size));

    if (pcred->p_svuid != pcred->p_ruid || pcred->p_svgid != pcred->p_rgid)
	goto out;

    // Check to see if the root is 'e' or 'n', is this a test for network?
    if (rootdevice[0] == 'e' && rootdevice[1] == 'n')
	goto out;

    NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, "mach.sym", p);
    if((error = vn_open(&nd, O_CREAT | FWRITE, S_IRUSR | S_IRGRP | S_IROTH))) goto out;

    vp = nd.ni_vp;
    
    /* Don't dump to non-regular files or files with links. */
    error = EFAULT;
    if (vp->v_type != VREG || VOP_GETATTR(vp, &vattr, cred, p)
    ||  vattr.va_nlink != 1)
	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 file type is MH_EXECUTE then this must be a kernel
    // as all Kernel extensions must be of type MH_OBJECT
    orig_ds = orig_ts = orig_le = NULL;
    orig_st = NULL;
    orig_mh = &_mh_execute_header;
    cmd = (struct load_command *) &orig_mh[1];
    for (i = 0; i < orig_mh->ncmds; i++) {
	if (cmd->cmd == LC_SEGMENT) {
	    struct segment_command *sg = (struct segment_command *) cmd;
    
	    if (!strcmp(SEG_TEXT, sg->segname))
		orig_ts = sg;
	    else if (!strcmp(SEG_DATA, sg->segname))
		orig_ds = sg;
	    else if (!strcmp(SEG_LINKEDIT, sg->segname))
		orig_le = sg;
	}
	else if (cmd->cmd == LC_SYMTAB)
	    orig_st = (struct symtab_command *) cmd;
    
	cmd = (struct load_command *) ((caddr_t) cmd + cmd->cmdsize);
    }

    if (!orig_ts || !orig_ds || !orig_le || !orig_st) 
	goto out;

    const_text = NULL;
    se = (struct section *) &orig_ts[1];
    for (i = 0; i < orig_ts->nsects; i++, se++) {
	if (!strcmp("__const", se->sectname)) {
	    const_text = se;
	    break;
	}
    }
    if (!const_text)
	goto out;

    header_size =   sizeof(struct mach_header) 
		    + orig_ts->cmdsize
		    + orig_ds->cmdsize
		    + sizeof(struct symtab_command);

    (void) kmem_alloc_wired(kernel_map,
			    (vm_offset_t *) &header,
			    (vm_size_t) header_size);
    if (header)
	bzero((void *) header, header_size);
    else
	goto out;

    /*
     *	Set up Mach-O header.
     */
    mh = (struct mach_header *) header;
    mh->magic      = orig_mh->magic;
    mh->cputype    = orig_mh->cputype;
    mh->cpusubtype = orig_mh->cpusubtype;
    mh->filetype   = orig_mh->filetype;
    mh->ncmds      = 3;
    mh->sizeofcmds = header_size - sizeof(struct mach_header);
    mh->flags      = orig_mh->flags;

    // Initialise the current file offset and addr
    offset = round_page(header_size);
    addr = (caddr_t) const_text->addr;	// Load address of __TEXT,__const

    /*
     * Construct a TEXT segment load command
     * the only part of the TEXT segment we keep is the __TEXT,__const
     * which contains the kernel vtables. 
     */
    sg = (struct segment_command *) &mh[1];
    bcopy(orig_ts, sg, orig_ts->cmdsize);
    sg->vmaddr   = (unsigned long) addr;
    sg->vmsize   = const_text->size;
    sg->fileoff  = 0;
    sg->filesize = const_text->size + round_page(header_size);
    sg->maxprot  = 0;
    sg->initprot = 0;
    sg->flags    = 0;
    se = (struct section *)(sg+1);
    for ( j = 0; j < sg->nsects; j++, se++ ) {
	se->addr  = (unsigned long) addr;
	se->size  = 0;
	se->offset = offset;
	se->nreloc = 0;
	if (!strcmp("__const", se->sectname)) {
	    se->size = const_text->size;
	    addr    += const_text->size;
	    offset  += const_text->size;
	    const_text = se;
	}
    }
    offset = round_page((vm_address_t) offset);

    // Now copy of the __DATA segment load command, the image need
    // not be stored to disk nobody needs it, yet!
    sg = (struct segment_command *)((int)sg + sg->cmdsize);
    bcopy(orig_ds, sg, orig_ds->cmdsize);

    sg->vmaddr   = (unsigned long) addr;
    sg->vmsize   = 0x1000;	// One page for some reason?
    sg->fileoff  = offset;
    sg->filesize = 0;
    sg->maxprot  = 0;
    sg->initprot = 0;
    sg->flags    = 0;
    se = (struct section *)(sg+1);
    for ( j = 0; j < sg->nsects; j++, se++ ) {
	se->addr  = (unsigned long) addr;
	se->size  = 0;
	se->offset = offset;
	se->nreloc = 0;
    }
    offset = round_page(offset);


    /*
     *	Set up LC_SYMTAB command
     */
    st          = (struct symtab_command *)((int)sg + sg->cmdsize);
    st->cmd     = LC_SYMTAB;
    st->cmdsize = sizeof(struct symtab_command);
    st->symoff  = offset;
    st->nsyms   = orig_st->nsyms;
    st->strsize = orig_st->strsize;
    st->stroff =  offset + st->nsyms * sizeof(struct nlist);    

    /*
     * Convert the symbol table in place from section references
     * to absolute references.
     */
    sym = (struct nlist *) orig_le->vmaddr;
    for (i = 0; i < st->nsyms; i++, sym++ ) {
	if ( (sym->n_type & N_TYPE) == N_SECT) {
	    sym->n_sect = NO_SECT;
	    sym->n_type = (sym->n_type & ~N_TYPE) | N_ABS;
	}
    }

    /*
     *	Write out the load commands at the beginning of the file.
     */
    error = vn_rdwr(UIO_WRITE, vp, (caddr_t) mh, header_size, (off_t) 0,
		    UIO_SYSSPACE, IO_NODELOCKED|IO_UNIT, cred, (int *) 0, p);
    if (error)
	goto out;

    /*
     *	Write out the __TEXT,__const data segment.
     */
    error = vn_rdwr(UIO_WRITE, vp, (caddr_t) const_text->addr,
		    const_text->size, const_text->offset,
		    UIO_SYSSPACE, IO_NODELOCKED|IO_UNIT, cred, (int *) 0, p);
    if (error)
	goto out;

    /*
     * 	Write out kernel symbols
     */
    offset = st->nsyms * sizeof(struct nlist) + st->strsize;	// symtab size
    error = vn_rdwr(UIO_WRITE, vp,
		   (caddr_t) orig_le->vmaddr, offset, st->symoff,
		    UIO_SYSSPACE, IO_NODELOCKED|IO_UNIT, cred, (int *) 0, p);
    if (error)
	goto out;

out:
    if (header)
	kmem_free(kernel_map, header, header_size);

    if (vp) {
	VOP_UNLOCK(vp, 0, p);
	error1 = vn_close(vp, FWRITE, cred, p);
	if (!error) error = error1;
    }

    return(error);
}
/*
 * 
 */
int get_kernel_symfile(struct proc *p, char **symfile)
{
    if (!kernel_symfile_opened) {
        kernel_symfile_opened = 1;
        error_code = output_kernel_symbols(p);
    }
    if (!error_code)
	*symfile = "\\mach.sym";

    return error_code;
}
Commit	Line	Data
1c79356b A	1	/*
	2	* Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
	3	*
	4	* @APPLE_LICENSE_HEADER_START@
	5	*
de355530 A	6	* The contents of this file constitute Original Code as defined in and
	7	* are subject to the Apple Public Source License Version 1.1 (the
	8	* "License"). You may not use this file except in compliance with the
	9	* License. Please obtain a copy of the License at
	10	* http://www.apple.com/publicsource and read it before using this file.
1c79356b	11	*
de355530 A	12	* This Original Code and all software distributed under the License are
de355530 A	13	* distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
1c79356b A	14	* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
1c79356b A	15	* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
de355530 A	16	* FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
	17	* License for the specific language governing rights and limitations
	18	* under the License.
1c79356b A	19	*
	20	* @APPLE_LICENSE_HEADER_END@
	21	*/
	22	/* Copyright (c) 1998 Apple Computer, Inc. All rights reserved.
	23	*
	24	* File: bsd/kern/kern_symfile.c
	25	*
	26	* This file contains creates a dummy symbol file for mach_kernel based on
	27	* the symbol table information passed by the SecondaryLoader/PlatformExpert.
	28	* This allows us to correctly link other executables (drivers, etc) against the
	29	* the kernel in cases where the kernel image on the root device does not match
	30	* the live kernel. This can occur during net-booting where the actual kernel
	31	* image is obtained from the network via tftp rather than the root
	32	* device.
	33	*
	34	* If a symbol table is available, then the file /mach.sym will be created
	35	* containing a Mach Header and a LC_SYMTAB load command followed by the
	36	* the symbol table data for mach_kernel.
	37	*
	38	* HISTORY
	39	*
	40	* .
	41	*/
	42
	43	#include <mach/vm_param.h>
	44
	45	#include <sys/param.h>
	46	#include <sys/systm.h>
	47	#include <sys/signalvar.h>
	48	#include <sys/resourcevar.h>
	49	#include <sys/namei.h>
	50	#include <sys/vnode.h>
	51	#include <sys/proc.h>
	52	#include <sys/timeb.h>
	53	#include <sys/times.h>
	54	#include <sys/buf.h>
	55	#include <sys/acct.h>
	56	#include <sys/file.h>
	57	#include <sys/uio.h>
	58	#include <sys/kernel.h>
	59	#include <sys/stat.h>
	60
	61	#include <mach-o/loader.h>
	62	#include <mach-o/nlist.h>
	63
	64	#include <vm/vm_kern.h>
	65
	66	extern unsigned char rootdevice[];
0b4e3aa0	67	extern struct mach_header _mh_execute_header;
1c79356b	68
0b4e3aa0 A	69	static int kernel_symfile_opened = 0;
0b4e3aa0 A	70	static int error_code = 0;
1c79356b	71
0b4e3aa0 A	72	extern int IODTGetLoaderInfo(char key, void infoAddr, int infoSize);
0b4e3aa0 A	73	extern void IODTFreeLoaderInfo(char key, void infoAddr, int infoSize);
1c79356b A	74
	75	/*
	76	*
	77	*/
0b4e3aa0	78	static int output_kernel_symbols(struct proc *p)
1c79356b	79	{
0b4e3aa0 A	80	struct vnode *vp;
	81	struct pcred *pcred = p->p_cred;
	82	struct ucred *cred = pcred->pc_ucred;
	83	struct nameidata nd;
	84	struct vattr vattr;
	85	struct load_command *cmd;
	86	struct mach_header orig_mh, mh;
	87	struct segment_command orig_ds, orig_ts, orig_le, sg;
	88	struct section se, const_text;
	89	struct symtab_command st, orig_st;
	90	struct nlist *sym;
	91	vm_size_t orig_mhsize, orig_st_size;
	92	vm_offset_t header;
	93	vm_size_t header_size;
	94	int error, error1;
	95	int i, j;
	96	caddr_t addr;
	97	vm_offset_t offset;
	98	int rc_mh, rc_sc;
	99
	100	error = EFAULT;
	101
	102	vp = NULL;
	103	header = NULL;
	104	orig_mh = NULL;
	105	orig_st = NULL;
	106
	107	// Dispose of unnecessary gumf, the booter doesn't need to load these
	108	rc_mh = IODTGetLoaderInfo("Kernel-__HEADER",
	109	(void **)&orig_mh, &orig_mhsize);
	110	if (rc_mh && orig_mh)
	111	IODTFreeLoaderInfo("Kernel-__HEADER",
de355530	112	(void *)orig_mh, round_page(orig_mhsize));
0b4e3aa0 A	113
	114	rc_sc = IODTGetLoaderInfo("Kernel-__SYMTAB",
	115	(void **) &orig_st, &orig_st_size);
	116	if (rc_sc && orig_st)
	117	IODTFreeLoaderInfo("Kernel-__SYMTAB",
de355530	118	(void *)orig_st, round_page(orig_st_size));
0b4e3aa0 A	119
	120	if (pcred->p_svuid != pcred->p_ruid \|\| pcred->p_svgid != pcred->p_rgid)
	121	goto out;
	122
	123	// Check to see if the root is 'e' or 'n', is this a test for network?
	124	if (rootdevice[0] == 'e' && rootdevice[1] == 'n')
	125	goto out;
	126
	127	NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, "mach.sym", p);
	128	if((error = vn_open(&nd, O_CREAT \| FWRITE, S_IRUSR \| S_IRGRP \| S_IROTH))) goto out;
	129
	130	vp = nd.ni_vp;
	131
	132	/* Don't dump to non-regular files or files with links. */
	133	error = EFAULT;
	134	if (vp->v_type != VREG \|\| VOP_GETATTR(vp, &vattr, cred, p)
	135	\|\| vattr.va_nlink != 1)
	136	goto out;
	137
	138	VATTR_NULL(&vattr);
	139	vattr.va_size = 0;
	140	VOP_LEASE(vp, p, cred, LEASE_WRITE);
	141	VOP_SETATTR(vp, &vattr, cred, p);
	142	p->p_acflag \|= ACORE;
	143
	144	// If the file type is MH_EXECUTE then this must be a kernel
	145	// as all Kernel extensions must be of type MH_OBJECT
	146	orig_ds = orig_ts = orig_le = NULL;
	147	orig_st = NULL;
	148	orig_mh = &_mh_execute_header;
	149	cmd = (struct load_command *) &orig_mh[1];
	150	for (i = 0; i < orig_mh->ncmds; i++) {
	151	if (cmd->cmd == LC_SEGMENT) {
	152	struct segment_command sg = (struct segment_command ) cmd;
	153
	154	if (!strcmp(SEG_TEXT, sg->segname))
	155	orig_ts = sg;
	156	else if (!strcmp(SEG_DATA, sg->segname))
	157	orig_ds = sg;
	158	else if (!strcmp(SEG_LINKEDIT, sg->segname))
	159	orig_le = sg;
	160	}
	161	else if (cmd->cmd == LC_SYMTAB)
	162	orig_st = (struct symtab_command *) cmd;
	163
	164	cmd = (struct load_command *) ((caddr_t) cmd + cmd->cmdsize);
1c79356b	165	}
1c79356b	166
0b4e3aa0 A	167	if (!orig_ts \|\| !orig_ds \|\| !orig_le \|\| !orig_st)
0b4e3aa0 A	168	goto out;
1c79356b	169
0b4e3aa0 A	170	const_text = NULL;
	171	se = (struct section *) &orig_ts[1];
	172	for (i = 0; i < orig_ts->nsects; i++, se++) {
	173	if (!strcmp("__const", se->sectname)) {
	174	const_text = se;
	175	break;
	176	}
	177	}
	178	if (!const_text)
	179	goto out;
	180
	181	header_size = sizeof(struct mach_header)
	182	+ orig_ts->cmdsize
	183	+ orig_ds->cmdsize
	184	+ sizeof(struct symtab_command);
	185
	186	(void) kmem_alloc_wired(kernel_map,
	187	(vm_offset_t *) &header,
	188	(vm_size_t) header_size);
	189	if (header)
	190	bzero((void *) header, header_size);
	191	else
	192	goto out;
	193
	194	/*
	195	* Set up Mach-O header.
	196	*/
	197	mh = (struct mach_header *) header;
	198	mh->magic = orig_mh->magic;
	199	mh->cputype = orig_mh->cputype;
	200	mh->cpusubtype = orig_mh->cpusubtype;
	201	mh->filetype = orig_mh->filetype;
	202	mh->ncmds = 3;
	203	mh->sizeofcmds = header_size - sizeof(struct mach_header);
	204	mh->flags = orig_mh->flags;
	205
	206	// Initialise the current file offset and addr
de355530	207	offset = round_page(header_size);
0b4e3aa0 A	208	addr = (caddr_t) const_text->addr; // Load address of __TEXT,__const
	209
	210	/*
	211	* Construct a TEXT segment load command
	212	* the only part of the TEXT segment we keep is the __TEXT,__const
	213	* which contains the kernel vtables.
	214	*/
	215	sg = (struct segment_command *) &mh[1];
	216	bcopy(orig_ts, sg, orig_ts->cmdsize);
	217	sg->vmaddr = (unsigned long) addr;
	218	sg->vmsize = const_text->size;
	219	sg->fileoff = 0;
de355530	220	sg->filesize = const_text->size + round_page(header_size);
0b4e3aa0 A	221	sg->maxprot = 0;
	222	sg->initprot = 0;
	223	sg->flags = 0;
	224	se = (struct section *)(sg+1);
	225	for ( j = 0; j < sg->nsects; j++, se++ ) {
	226	se->addr = (unsigned long) addr;
	227	se->size = 0;
	228	se->offset = offset;
	229	se->nreloc = 0;
	230	if (!strcmp("__const", se->sectname)) {
	231	se->size = const_text->size;
	232	addr += const_text->size;
	233	offset += const_text->size;
	234	const_text = se;
	235	}
	236	}
de355530	237	offset = round_page((vm_address_t) offset);
0b4e3aa0 A	238
	239	// Now copy of the __DATA segment load command, the image need
	240	// not be stored to disk nobody needs it, yet!
	241	sg = (struct segment_command *)((int)sg + sg->cmdsize);
	242	bcopy(orig_ds, sg, orig_ds->cmdsize);
	243
	244	sg->vmaddr = (unsigned long) addr;
	245	sg->vmsize = 0x1000; // One page for some reason?
	246	sg->fileoff = offset;
	247	sg->filesize = 0;
	248	sg->maxprot = 0;
	249	sg->initprot = 0;
	250	sg->flags = 0;
	251	se = (struct section *)(sg+1);
	252	for ( j = 0; j < sg->nsects; j++, se++ ) {
	253	se->addr = (unsigned long) addr;
	254	se->size = 0;
	255	se->offset = offset;
	256	se->nreloc = 0;
	257	}
de355530	258	offset = round_page(offset);
0b4e3aa0 A	259
	260
	261	/*
	262	* Set up LC_SYMTAB command
	263	*/
	264	st = (struct symtab_command *)((int)sg + sg->cmdsize);
	265	st->cmd = LC_SYMTAB;
	266	st->cmdsize = sizeof(struct symtab_command);
	267	st->symoff = offset;
	268	st->nsyms = orig_st->nsyms;
	269	st->strsize = orig_st->strsize;
	270	st->stroff = offset + st->nsyms * sizeof(struct nlist);
	271
	272	/*
	273	* Convert the symbol table in place from section references
	274	* to absolute references.
	275	*/
	276	sym = (struct nlist *) orig_le->vmaddr;
	277	for (i = 0; i < st->nsyms; i++, sym++ ) {
	278	if ( (sym->n_type & N_TYPE) == N_SECT) {
	279	sym->n_sect = NO_SECT;
	280	sym->n_type = (sym->n_type & ~N_TYPE) \| N_ABS;
	281	}
	282	}
	283
	284	/*
	285	* Write out the load commands at the beginning of the file.
	286	*/
	287	error = vn_rdwr(UIO_WRITE, vp, (caddr_t) mh, header_size, (off_t) 0,
	288	UIO_SYSSPACE, IO_NODELOCKED\|IO_UNIT, cred, (int *) 0, p);
	289	if (error)
	290	goto out;
	291
	292	/*
	293	* Write out the __TEXT,__const data segment.
	294	*/
	295	error = vn_rdwr(UIO_WRITE, vp, (caddr_t) const_text->addr,
	296	const_text->size, const_text->offset,
	297	UIO_SYSSPACE, IO_NODELOCKED\|IO_UNIT, cred, (int *) 0, p);
	298	if (error)
	299	goto out;
	300
	301	/*
	302	* Write out kernel symbols
	303	*/
	304	offset = st->nsyms * sizeof(struct nlist) + st->strsize; // symtab size
	305	error = vn_rdwr(UIO_WRITE, vp,
	306	(caddr_t) orig_le->vmaddr, offset, st->symoff,
	307	UIO_SYSSPACE, IO_NODELOCKED\|IO_UNIT, cred, (int *) 0, p);
	308	if (error)
	309	goto out;
1c79356b A	310
1c79356b A	311	out:
0b4e3aa0 A	312	if (header)
	313	kmem_free(kernel_map, header, header_size);
	314
	315	if (vp) {
	316	VOP_UNLOCK(vp, 0, p);
	317	error1 = vn_close(vp, FWRITE, cred, p);
	318	if (!error) error = error1;
	319	}
1c79356b	320
0b4e3aa0 A	321	return(error);
0b4e3aa0 A	322	}
1c79356b A	323	/*
	324	*
	325	*/
0b4e3aa0	326	int get_kernel_symfile(struct proc p, char *symfile)
1c79356b	327	{
0b4e3aa0 A	328	if (!kernel_symfile_opened) {
	329	kernel_symfile_opened = 1;
	330	error_code = output_kernel_symbols(p);
1c79356b	331	}
0b4e3aa0 A	332	if (!error_code)
0b4e3aa0 A	333	*symfile = "\\mach.sym";
1c79356b	334
0b4e3aa0 A	335	return error_code;
0b4e3aa0 A	336	}