xref: /freebsd/lib/libkvm/kvm_amd64.c (revision c10970dd7d7cd88f4e14743bd56f6bf010c49274)
1f95a0250SRodney W. Grimes /*-
2f95a0250SRodney W. Grimes  * Copyright (c) 1989, 1992, 1993
3f95a0250SRodney W. Grimes  *	The Regents of the University of California.  All rights reserved.
4f95a0250SRodney W. Grimes  *
5f95a0250SRodney W. Grimes  * This code is derived from software developed by the Computer Systems
6f95a0250SRodney W. Grimes  * Engineering group at Lawrence Berkeley Laboratory under DARPA contract
7f95a0250SRodney W. Grimes  * BG 91-66 and contributed to Berkeley.
8f95a0250SRodney W. Grimes  *
9f95a0250SRodney W. Grimes  * Redistribution and use in source and binary forms, with or without
10f95a0250SRodney W. Grimes  * modification, are permitted provided that the following conditions
11f95a0250SRodney W. Grimes  * are met:
12f95a0250SRodney W. Grimes  * 1. Redistributions of source code must retain the above copyright
13f95a0250SRodney W. Grimes  *    notice, this list of conditions and the following disclaimer.
14f95a0250SRodney W. Grimes  * 2. Redistributions in binary form must reproduce the above copyright
15f95a0250SRodney W. Grimes  *    notice, this list of conditions and the following disclaimer in the
16f95a0250SRodney W. Grimes  *    documentation and/or other materials provided with the distribution.
17f95a0250SRodney W. Grimes  * 4. Neither the name of the University nor the names of its contributors
18f95a0250SRodney W. Grimes  *    may be used to endorse or promote products derived from this software
19f95a0250SRodney W. Grimes  *    without specific prior written permission.
20f95a0250SRodney W. Grimes  *
21f95a0250SRodney W. Grimes  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22f95a0250SRodney W. Grimes  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23f95a0250SRodney W. Grimes  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24f95a0250SRodney W. Grimes  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25f95a0250SRodney W. Grimes  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26f95a0250SRodney W. Grimes  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27f95a0250SRodney W. Grimes  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28f95a0250SRodney W. Grimes  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29f95a0250SRodney W. Grimes  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30f95a0250SRodney W. Grimes  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31f95a0250SRodney W. Grimes  * SUCH DAMAGE.
32f95a0250SRodney W. Grimes  */
33f95a0250SRodney W. Grimes 
34e67f5b9fSMatthew Dillon #include <sys/cdefs.h>
35e67f5b9fSMatthew Dillon __FBSDID("$FreeBSD$");
36e67f5b9fSMatthew Dillon 
37f95a0250SRodney W. Grimes #if defined(LIBC_SCCS) && !defined(lint)
38c4a7cdb3SPeter Wemm #if 0
39f95a0250SRodney W. Grimes static char sccsid[] = "@(#)kvm_hp300.c	8.1 (Berkeley) 6/4/93";
40c4a7cdb3SPeter Wemm #endif
41f95a0250SRodney W. Grimes #endif /* LIBC_SCCS and not lint */
42f95a0250SRodney W. Grimes 
43f95a0250SRodney W. Grimes /*
44a1de871dSPeter Wemm  * AMD64 machine dependent routines for kvm.  Hopefully, the forthcoming
45f95a0250SRodney W. Grimes  * vm code will one day obsolete this module.
46f95a0250SRodney W. Grimes  */
47f95a0250SRodney W. Grimes 
48f95a0250SRodney W. Grimes #include <sys/param.h>
49f95a0250SRodney W. Grimes #include <sys/user.h>
50f95a0250SRodney W. Grimes #include <sys/proc.h>
51f95a0250SRodney W. Grimes #include <sys/stat.h>
52e55a0cd8SPeter Wemm #include <sys/mman.h>
5351295a4dSJordan K. Hubbard #include <stdlib.h>
54953e4134SEd Schouten #include <string.h>
55f95a0250SRodney W. Grimes #include <unistd.h>
56f95a0250SRodney W. Grimes #include <nlist.h>
57f95a0250SRodney W. Grimes #include <kvm.h>
58f95a0250SRodney W. Grimes 
59f95a0250SRodney W. Grimes #include <vm/vm.h>
60f95a0250SRodney W. Grimes #include <vm/vm_param.h>
61f95a0250SRodney W. Grimes 
62e55a0cd8SPeter Wemm #include <machine/elf.h>
63e55a0cd8SPeter Wemm 
64f95a0250SRodney W. Grimes #include <limits.h>
65f95a0250SRodney W. Grimes 
66f95a0250SRodney W. Grimes #include "kvm_private.h"
67f95a0250SRodney W. Grimes 
68f95a0250SRodney W. Grimes #ifndef btop
69a1de871dSPeter Wemm #define	btop(x)		(amd64_btop(x))
70a1de871dSPeter Wemm #define	ptob(x)		(amd64_ptob(x))
71f95a0250SRodney W. Grimes #endif
72f95a0250SRodney W. Grimes 
73e9ca6fe4SPeter Wemm /* minidump must be the first item! */
74f95a0250SRodney W. Grimes struct vmstate {
75e9ca6fe4SPeter Wemm 	int		minidump;	/* 1 = minidump mode */
76e55a0cd8SPeter Wemm 	void		*mmapbase;
77e55a0cd8SPeter Wemm 	size_t		mmapsize;
78f2b29125SPeter Wemm 	pml4_entry_t	*PML4;
79f95a0250SRodney W. Grimes };
80f95a0250SRodney W. Grimes 
81e55a0cd8SPeter Wemm /*
82e55a0cd8SPeter Wemm  * Map the ELF headers into the process' address space. We do this in two
83e55a0cd8SPeter Wemm  * steps: first the ELF header itself and using that information the whole
84e55a0cd8SPeter Wemm  * set of headers. (Taken from kvm_ia64.c)
85e55a0cd8SPeter Wemm  */
86e55a0cd8SPeter Wemm static int
87e55a0cd8SPeter Wemm _kvm_maphdrs(kvm_t *kd, size_t sz)
88e55a0cd8SPeter Wemm {
89e55a0cd8SPeter Wemm 	struct vmstate *vm = kd->vmst;
90e55a0cd8SPeter Wemm 
91e55a0cd8SPeter Wemm 	/* munmap() previous mmap(). */
92e55a0cd8SPeter Wemm 	if (vm->mmapbase != NULL) {
93e55a0cd8SPeter Wemm 		munmap(vm->mmapbase, vm->mmapsize);
94e55a0cd8SPeter Wemm 		vm->mmapbase = NULL;
95e55a0cd8SPeter Wemm 	}
96e55a0cd8SPeter Wemm 
97e55a0cd8SPeter Wemm 	vm->mmapsize = sz;
98e55a0cd8SPeter Wemm 	vm->mmapbase = mmap(NULL, sz, PROT_READ, MAP_PRIVATE, kd->pmfd, 0);
99e55a0cd8SPeter Wemm 	if (vm->mmapbase == MAP_FAILED) {
100e55a0cd8SPeter Wemm 		_kvm_err(kd, kd->program, "cannot mmap corefile");
101e55a0cd8SPeter Wemm 		return (-1);
102e55a0cd8SPeter Wemm 	}
103e55a0cd8SPeter Wemm 	return (0);
104e55a0cd8SPeter Wemm }
105e55a0cd8SPeter Wemm 
106e55a0cd8SPeter Wemm /*
107e55a0cd8SPeter Wemm  * Translate a physical memory address to a file-offset in the crash-dump.
108e55a0cd8SPeter Wemm  * (Taken from kvm_ia64.c)
109e55a0cd8SPeter Wemm  */
110e55a0cd8SPeter Wemm static size_t
111e55a0cd8SPeter Wemm _kvm_pa2off(kvm_t *kd, uint64_t pa, off_t *ofs)
112e55a0cd8SPeter Wemm {
113e55a0cd8SPeter Wemm 	Elf_Ehdr *e = kd->vmst->mmapbase;
114d7dc9f76SHidetoshi Shimokawa 	Elf_Phdr *p;
115d7dc9f76SHidetoshi Shimokawa 	int n;
116e55a0cd8SPeter Wemm 
117d7dc9f76SHidetoshi Shimokawa 	if (kd->rawdump) {
118d7dc9f76SHidetoshi Shimokawa 		*ofs = pa;
119d7dc9f76SHidetoshi Shimokawa 		return (PAGE_SIZE - ((size_t)pa & PAGE_MASK));
120d7dc9f76SHidetoshi Shimokawa 	}
121d7dc9f76SHidetoshi Shimokawa 
122d7dc9f76SHidetoshi Shimokawa 	p = (Elf_Phdr*)((char*)e + e->e_phoff);
123d7dc9f76SHidetoshi Shimokawa 	n = e->e_phnum;
124e55a0cd8SPeter Wemm 	while (n && (pa < p->p_paddr || pa >= p->p_paddr + p->p_memsz))
125e55a0cd8SPeter Wemm 		p++, n--;
126e55a0cd8SPeter Wemm 	if (n == 0)
127e55a0cd8SPeter Wemm 		return (0);
128e55a0cd8SPeter Wemm 	*ofs = (pa - p->p_paddr) + p->p_offset;
129e55a0cd8SPeter Wemm 	return (PAGE_SIZE - ((size_t)pa & PAGE_MASK));
130e55a0cd8SPeter Wemm }
131e55a0cd8SPeter Wemm 
132f95a0250SRodney W. Grimes void
1332f85bf6eSPeter Wemm _kvm_freevtop(kvm_t *kd)
1342f85bf6eSPeter Wemm {
135e55a0cd8SPeter Wemm 	struct vmstate *vm = kd->vmst;
136e55a0cd8SPeter Wemm 
137e9ca6fe4SPeter Wemm 	if (kd->vmst->minidump)
138e9ca6fe4SPeter Wemm 		return (_kvm_minidump_freevtop(kd));
139e55a0cd8SPeter Wemm 	if (vm->mmapbase != NULL)
140e55a0cd8SPeter Wemm 		munmap(vm->mmapbase, vm->mmapsize);
141e55a0cd8SPeter Wemm 	if (vm->PML4)
142e55a0cd8SPeter Wemm 		free(vm->PML4);
143e55a0cd8SPeter Wemm 	free(vm);
144e55a0cd8SPeter Wemm 	kd->vmst = NULL;
14521d54b07SRodney W. Grimes }
146f95a0250SRodney W. Grimes 
147f95a0250SRodney W. Grimes int
1482f85bf6eSPeter Wemm _kvm_initvtop(kvm_t *kd)
1492f85bf6eSPeter Wemm {
150*c10970ddSUlrich Spörlein 	struct nlist nl[2];
1512f85bf6eSPeter Wemm 	u_long pa;
152f85f3040SPeter Wemm 	u_long kernbase;
153f2b29125SPeter Wemm 	pml4_entry_t	*PML4;
154e55a0cd8SPeter Wemm 	Elf_Ehdr *ehdr;
155e55a0cd8SPeter Wemm 	size_t hdrsz;
156e9ca6fe4SPeter Wemm 	char minihdr[8];
157e9ca6fe4SPeter Wemm 
158d7dc9f76SHidetoshi Shimokawa 	if (!kd->rawdump && pread(kd->pmfd, &minihdr, 8, 0) == 8)
159e9ca6fe4SPeter Wemm 		if (memcmp(&minihdr, "minidump", 8) == 0)
160e9ca6fe4SPeter Wemm 			return (_kvm_minidump_initvtop(kd));
161f95a0250SRodney W. Grimes 
162e55a0cd8SPeter Wemm 	kd->vmst = (struct vmstate *)_kvm_malloc(kd, sizeof(*kd->vmst));
163e55a0cd8SPeter Wemm 	if (kd->vmst == 0) {
16421d54b07SRodney W. Grimes 		_kvm_err(kd, kd->program, "cannot allocate vm");
165f95a0250SRodney W. Grimes 		return (-1);
16621d54b07SRodney W. Grimes 	}
167e55a0cd8SPeter Wemm 	kd->vmst->PML4 = 0;
168e55a0cd8SPeter Wemm 
169d7dc9f76SHidetoshi Shimokawa 	if (kd->rawdump == 0) {
170e55a0cd8SPeter Wemm 		if (_kvm_maphdrs(kd, sizeof(Elf_Ehdr)) == -1)
171e55a0cd8SPeter Wemm 			return (-1);
172e55a0cd8SPeter Wemm 
173e55a0cd8SPeter Wemm 		ehdr = kd->vmst->mmapbase;
174e55a0cd8SPeter Wemm 		hdrsz = ehdr->e_phoff + ehdr->e_phentsize * ehdr->e_phnum;
175e55a0cd8SPeter Wemm 		if (_kvm_maphdrs(kd, hdrsz) == -1)
176e55a0cd8SPeter Wemm 			return (-1);
177d7dc9f76SHidetoshi Shimokawa 	}
178f95a0250SRodney W. Grimes 
179*c10970ddSUlrich Spörlein 	nl[0].n_name = "kernbase";
180*c10970ddSUlrich Spörlein 	nl[1].n_name = 0;
181f85f3040SPeter Wemm 
182*c10970ddSUlrich Spörlein 	if (kvm_nlist(kd, nl) != 0) {
183f2b29125SPeter Wemm 		_kvm_err(kd, kd->program, "bad namelist - no kernbase");
184f2b29125SPeter Wemm 		return (-1);
185f2b29125SPeter Wemm 	}
186*c10970ddSUlrich Spörlein 	kernbase = nl[0].n_value;
187f85f3040SPeter Wemm 
188*c10970ddSUlrich Spörlein 	nl[0].n_name = "KPML4phys";
189*c10970ddSUlrich Spörlein 	nl[1].n_name = 0;
190f95a0250SRodney W. Grimes 
191*c10970ddSUlrich Spörlein 	if (kvm_nlist(kd, nl) != 0) {
192f2b29125SPeter Wemm 		_kvm_err(kd, kd->program, "bad namelist - no KPML4phys");
193f95a0250SRodney W. Grimes 		return (-1);
194f95a0250SRodney W. Grimes 	}
195*c10970ddSUlrich Spörlein 	if (kvm_read(kd, (nl[0].n_value - kernbase), &pa, sizeof(pa)) !=
196f85f3040SPeter Wemm 	    sizeof(pa)) {
197f2b29125SPeter Wemm 		_kvm_err(kd, kd->program, "cannot read KPML4phys");
198f95a0250SRodney W. Grimes 		return (-1);
199f95a0250SRodney W. Grimes 	}
200f2b29125SPeter Wemm 	PML4 = _kvm_malloc(kd, PAGE_SIZE);
201f2b29125SPeter Wemm 	if (kvm_read(kd, pa, PML4, PAGE_SIZE) != PAGE_SIZE) {
202f2b29125SPeter Wemm 		_kvm_err(kd, kd->program, "cannot read KPML4phys");
203f95a0250SRodney W. Grimes 		return (-1);
204f95a0250SRodney W. Grimes 	}
205e55a0cd8SPeter Wemm 	kd->vmst->PML4 = PML4;
206f95a0250SRodney W. Grimes 	return (0);
207f95a0250SRodney W. Grimes }
208f95a0250SRodney W. Grimes 
209f95a0250SRodney W. Grimes static int
210e55a0cd8SPeter Wemm _kvm_vatop(kvm_t *kd, u_long va, off_t *pa)
2112f85bf6eSPeter Wemm {
2122f85bf6eSPeter Wemm 	struct vmstate *vm;
2132f85bf6eSPeter Wemm 	u_long offset;
214f2b29125SPeter Wemm 	u_long pdpe_pa;
215f2b29125SPeter Wemm 	u_long pde_pa;
2162f85bf6eSPeter Wemm 	u_long pte_pa;
217f2b29125SPeter Wemm 	pml4_entry_t pml4e;
218f2b29125SPeter Wemm 	pdp_entry_t pdpe;
2192f85bf6eSPeter Wemm 	pd_entry_t pde;
2202f85bf6eSPeter Wemm 	pt_entry_t pte;
221f2b29125SPeter Wemm 	u_long pml4eindex;
222f2b29125SPeter Wemm 	u_long pdpeindex;
2232f85bf6eSPeter Wemm 	u_long pdeindex;
2242f85bf6eSPeter Wemm 	u_long pteindex;
225e55a0cd8SPeter Wemm 	u_long a;
226e55a0cd8SPeter Wemm 	off_t ofs;
227e55a0cd8SPeter Wemm 	size_t s;
2282f85bf6eSPeter Wemm 
2292f85bf6eSPeter Wemm 	vm = kd->vmst;
2302f85bf6eSPeter Wemm 	offset = va & (PAGE_SIZE - 1);
2312f85bf6eSPeter Wemm 
2322f85bf6eSPeter Wemm 	/*
2332f85bf6eSPeter Wemm 	 * If we are initializing (kernel page table descriptor pointer
2342f85bf6eSPeter Wemm 	 * not yet set) then return pa == va to avoid infinite recursion.
2352f85bf6eSPeter Wemm 	 */
236f2b29125SPeter Wemm 	if (vm->PML4 == 0) {
237e55a0cd8SPeter Wemm 		s = _kvm_pa2off(kd, va, pa);
238e55a0cd8SPeter Wemm 		if (s == 0) {
239e55a0cd8SPeter Wemm 			_kvm_err(kd, kd->program,
240e55a0cd8SPeter Wemm 			    "_kvm_vatop: bootstrap data not in dump");
241e55a0cd8SPeter Wemm 			goto invalid;
242e55a0cd8SPeter Wemm 		} else
2432f85bf6eSPeter Wemm 			return (PAGE_SIZE - offset);
2442f85bf6eSPeter Wemm 	}
2452f85bf6eSPeter Wemm 
246f2b29125SPeter Wemm 	pml4eindex = (va >> PML4SHIFT) & (NPML4EPG - 1);
247f2b29125SPeter Wemm 	pml4e = vm->PML4[pml4eindex];
248e55a0cd8SPeter Wemm 	if (((u_long)pml4e & PG_V) == 0) {
249e55a0cd8SPeter Wemm 		_kvm_err(kd, kd->program, "_kvm_vatop: pml4e not valid");
250f2b29125SPeter Wemm 		goto invalid;
251e55a0cd8SPeter Wemm 	}
252f2b29125SPeter Wemm 
253f2b29125SPeter Wemm 	pdpeindex = (va >> PDPSHIFT) & (NPDPEPG-1);
254e55a0cd8SPeter Wemm 	pdpe_pa = ((u_long)pml4e & PG_FRAME) +
255e55a0cd8SPeter Wemm 	    (pdpeindex * sizeof(pdp_entry_t));
256f2b29125SPeter Wemm 
257e55a0cd8SPeter Wemm 	s = _kvm_pa2off(kd, pdpe_pa, &ofs);
258add112ffSPeter Wemm 	if (s < sizeof pdpe) {
259e55a0cd8SPeter Wemm 		_kvm_err(kd, kd->program, "_kvm_vatop: pdpe_pa not found");
260e55a0cd8SPeter Wemm 		goto invalid;
261e55a0cd8SPeter Wemm 	}
262e55a0cd8SPeter Wemm 	if (lseek(kd->pmfd, ofs, 0) == -1) {
263f2b29125SPeter Wemm 		_kvm_syserr(kd, kd->program, "_kvm_vatop: lseek pdpe_pa");
264f2b29125SPeter Wemm 		goto invalid;
265f2b29125SPeter Wemm 	}
266f2b29125SPeter Wemm 	if (read(kd->pmfd, &pdpe, sizeof pdpe) != sizeof pdpe) {
267f2b29125SPeter Wemm 		_kvm_syserr(kd, kd->program, "_kvm_vatop: read pdpe");
268f2b29125SPeter Wemm 		goto invalid;
269f2b29125SPeter Wemm 	}
270e55a0cd8SPeter Wemm 	if (((u_long)pdpe & PG_V) == 0) {
271e55a0cd8SPeter Wemm 		_kvm_err(kd, kd->program, "_kvm_vatop: pdpe not valid");
272f2b29125SPeter Wemm 		goto invalid;
273e55a0cd8SPeter Wemm 	}
274f2b29125SPeter Wemm 
275f2b29125SPeter Wemm 	pdeindex = (va >> PDRSHIFT) & (NPDEPG-1);
276f2b29125SPeter Wemm 	pde_pa = ((u_long)pdpe & PG_FRAME) + (pdeindex * sizeof(pd_entry_t));
277f2b29125SPeter Wemm 
278e55a0cd8SPeter Wemm 	s = _kvm_pa2off(kd, pde_pa, &ofs);
279add112ffSPeter Wemm 	if (s < sizeof pde) {
280e55a0cd8SPeter Wemm 		_kvm_syserr(kd, kd->program, "_kvm_vatop: pde_pa not found");
281e55a0cd8SPeter Wemm 		goto invalid;
282e55a0cd8SPeter Wemm 	}
283e55a0cd8SPeter Wemm 	if (lseek(kd->pmfd, ofs, 0) == -1) {
284e55a0cd8SPeter Wemm 		_kvm_err(kd, kd->program, "_kvm_vatop: lseek pde_pa");
285f2b29125SPeter Wemm 		goto invalid;
286f2b29125SPeter Wemm 	}
287f2b29125SPeter Wemm 	if (read(kd->pmfd, &pde, sizeof pde) != sizeof pde) {
288f2b29125SPeter Wemm 		_kvm_syserr(kd, kd->program, "_kvm_vatop: read pde");
289f2b29125SPeter Wemm 		goto invalid;
290f2b29125SPeter Wemm 	}
291e55a0cd8SPeter Wemm 	if (((u_long)pde & PG_V) == 0) {
292e55a0cd8SPeter Wemm 		_kvm_err(kd, kd->program, "_kvm_vatop: pde not valid");
2932f85bf6eSPeter Wemm 		goto invalid;
294e55a0cd8SPeter Wemm 	}
2952f85bf6eSPeter Wemm 
2964afb0d5aSTor Egge 	if ((u_long)pde & PG_PS) {
2974afb0d5aSTor Egge 	      /*
298f2b29125SPeter Wemm 	       * No final-level page table; ptd describes one 2MB page.
2994afb0d5aSTor Egge 	       */
300f2b29125SPeter Wemm #define	PAGE2M_MASK	(NBPDR - 1)
301f2b29125SPeter Wemm #define	PG_FRAME2M	(~PAGE2M_MASK)
302e55a0cd8SPeter Wemm 		a = ((u_long)pde & PG_FRAME2M) + (va & PAGE2M_MASK);
303e55a0cd8SPeter Wemm 		s = _kvm_pa2off(kd, a, pa);
304e55a0cd8SPeter Wemm 		if (s == 0) {
305e55a0cd8SPeter Wemm 			_kvm_err(kd, kd->program,
306e55a0cd8SPeter Wemm 			    "_kvm_vatop: 2MB page address not in dump");
307e55a0cd8SPeter Wemm 			goto invalid;
308e55a0cd8SPeter Wemm 		} else
309f2b29125SPeter Wemm 			return (NBPDR - (va & PAGE2M_MASK));
3104afb0d5aSTor Egge 	}
3114afb0d5aSTor Egge 
3122f85bf6eSPeter Wemm 	pteindex = (va >> PAGE_SHIFT) & (NPTEPG-1);
3132f85bf6eSPeter Wemm 	pte_pa = ((u_long)pde & PG_FRAME) + (pteindex * sizeof(pt_entry_t));
3142f85bf6eSPeter Wemm 
315e55a0cd8SPeter Wemm 	s = _kvm_pa2off(kd, pte_pa, &ofs);
316add112ffSPeter Wemm 	if (s < sizeof pte) {
317e55a0cd8SPeter Wemm 		_kvm_err(kd, kd->program, "_kvm_vatop: pte_pa not found");
318e55a0cd8SPeter Wemm 		goto invalid;
319e55a0cd8SPeter Wemm 	}
320e55a0cd8SPeter Wemm 	if (lseek(kd->pmfd, ofs, 0) == -1) {
3212f85bf6eSPeter Wemm 		_kvm_syserr(kd, kd->program, "_kvm_vatop: lseek");
3222f85bf6eSPeter Wemm 		goto invalid;
3232f85bf6eSPeter Wemm 	}
3242f85bf6eSPeter Wemm 	if (read(kd->pmfd, &pte, sizeof pte) != sizeof pte) {
3252f85bf6eSPeter Wemm 		_kvm_syserr(kd, kd->program, "_kvm_vatop: read");
3262f85bf6eSPeter Wemm 		goto invalid;
3272f85bf6eSPeter Wemm 	}
328e55a0cd8SPeter Wemm 	if (((u_long)pte & PG_V) == 0) {
329e55a0cd8SPeter Wemm 		_kvm_err(kd, kd->program, "_kvm_vatop: pte not valid");
3302f85bf6eSPeter Wemm 		goto invalid;
331e55a0cd8SPeter Wemm 	}
3322f85bf6eSPeter Wemm 
333e55a0cd8SPeter Wemm 	a = ((u_long)pte & PG_FRAME) + offset;
334e55a0cd8SPeter Wemm 	s = _kvm_pa2off(kd, a, pa);
335e55a0cd8SPeter Wemm 	if (s == 0) {
336e55a0cd8SPeter Wemm 		_kvm_err(kd, kd->program, "_kvm_vatop: address not in dump");
337e55a0cd8SPeter Wemm 		goto invalid;
338e55a0cd8SPeter Wemm 	} else
3392f85bf6eSPeter Wemm 		return (PAGE_SIZE - offset);
3402f85bf6eSPeter Wemm 
3412f85bf6eSPeter Wemm invalid:
342e55a0cd8SPeter Wemm 	_kvm_err(kd, 0, "invalid address (0x%lx)", va);
3432f85bf6eSPeter Wemm 	return (0);
344f95a0250SRodney W. Grimes }
345f95a0250SRodney W. Grimes 
346f95a0250SRodney W. Grimes int
347e55a0cd8SPeter Wemm _kvm_kvatop(kvm_t *kd, u_long va, off_t *pa)
3482f85bf6eSPeter Wemm {
349e55a0cd8SPeter Wemm 
350e9ca6fe4SPeter Wemm 	if (kd->vmst->minidump)
351e9ca6fe4SPeter Wemm 		return (_kvm_minidump_kvatop(kd, va, pa));
352e55a0cd8SPeter Wemm 	if (ISALIVE(kd)) {
353e55a0cd8SPeter Wemm 		_kvm_err(kd, 0, "kvm_kvatop called in live kernel!");
354e55a0cd8SPeter Wemm 		return (0);
355e55a0cd8SPeter Wemm 	}
35621d54b07SRodney W. Grimes 	return (_kvm_vatop(kd, va, pa));
357f95a0250SRodney W. Grimes }
358