2 * Copyright (c) 2006 Peter Wemm
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 #include <sys/cdefs.h>
27 __FBSDID("$FreeBSD$");
30 * i386 machine dependent routines for kvm and minidumps.
33 #include <sys/param.h>
34 #include <sys/endian.h>
41 #include "../../sys/i386/include/minidump.h"
45 #include "kvm_private.h"
48 #define i386_round_page(x) roundup2((kvaddr_t)(x), I386_PAGE_SIZE)
51 struct minidumphdr hdr;
57 _i386_minidump_probe(kvm_t *kd)
60 return (_kvm_probe_elf_kernel(kd, ELFCLASS32, EM_386) &&
61 _kvm_is_minidump(kd));
65 _i386_minidump_freevtop(kvm_t *kd)
67 struct vmstate *vm = kd->vmst;
69 _kvm_hpt_free(&vm->hpt);
77 _i386_minidump_initvtop(kvm_t *kd)
83 vmst = _kvm_malloc(kd, sizeof(*vmst));
85 _kvm_err(kd, kd->program, "cannot allocate vm");
89 if (pread(kd->pmfd, &vmst->hdr, sizeof(vmst->hdr), 0) !=
91 _kvm_err(kd, kd->program, "cannot read dump header");
94 if (strncmp(MINIDUMP_MAGIC, vmst->hdr.magic, sizeof(vmst->hdr.magic)) != 0) {
95 _kvm_err(kd, kd->program, "not a minidump for this platform");
98 vmst->hdr.version = le32toh(vmst->hdr.version);
99 if (vmst->hdr.version != MINIDUMP_VERSION) {
100 _kvm_err(kd, kd->program, "wrong minidump version. expected %d got %d",
101 MINIDUMP_VERSION, vmst->hdr.version);
104 vmst->hdr.msgbufsize = le32toh(vmst->hdr.msgbufsize);
105 vmst->hdr.bitmapsize = le32toh(vmst->hdr.bitmapsize);
106 vmst->hdr.ptesize = le32toh(vmst->hdr.ptesize);
107 vmst->hdr.kernbase = le32toh(vmst->hdr.kernbase);
108 vmst->hdr.paemode = le32toh(vmst->hdr.paemode);
110 /* Skip header and msgbuf */
111 off = I386_PAGE_SIZE + i386_round_page(vmst->hdr.msgbufsize);
113 bitmap = _kvm_malloc(kd, vmst->hdr.bitmapsize);
114 if (bitmap == NULL) {
115 _kvm_err(kd, kd->program, "cannot allocate %d bytes for bitmap", vmst->hdr.bitmapsize);
118 if (pread(kd->pmfd, bitmap, vmst->hdr.bitmapsize, off) !=
119 (ssize_t)vmst->hdr.bitmapsize) {
120 _kvm_err(kd, kd->program, "cannot read %d bytes for page bitmap", vmst->hdr.bitmapsize);
124 off += i386_round_page(vmst->hdr.bitmapsize);
126 vmst->ptemap = _kvm_malloc(kd, vmst->hdr.ptesize);
127 if (vmst->ptemap == NULL) {
128 _kvm_err(kd, kd->program, "cannot allocate %d bytes for ptemap", vmst->hdr.ptesize);
132 if (pread(kd->pmfd, vmst->ptemap, vmst->hdr.ptesize, off) !=
133 (ssize_t)vmst->hdr.ptesize) {
134 _kvm_err(kd, kd->program, "cannot read %d bytes for ptemap", vmst->hdr.ptesize);
138 off += vmst->hdr.ptesize;
140 /* build physical address hash table for sparse pages */
141 _kvm_hpt_init(kd, &vmst->hpt, bitmap, vmst->hdr.bitmapsize, off,
142 I386_PAGE_SIZE, sizeof(*bitmap));
149 _i386_minidump_vatop_pae(kvm_t *kd, kvaddr_t va, off_t *pa)
152 i386_physaddr_pae_t offset;
155 i386_physaddr_pae_t a;
157 i386_pte_pae_t *ptemap;
161 offset = va & I386_PAGE_MASK;
163 if (va >= vm->hdr.kernbase) {
164 pteindex = (va - vm->hdr.kernbase) >> I386_PAGE_SHIFT;
165 pte = le64toh(ptemap[pteindex]);
166 if ((pte & I386_PG_V) == 0) {
167 _kvm_err(kd, kd->program,
168 "_i386_minidump_vatop_pae: pte not valid");
171 a = pte & I386_PG_FRAME_PAE;
172 ofs = _kvm_hpt_find(&vm->hpt, a);
174 _kvm_err(kd, kd->program,
175 "_i386_minidump_vatop_pae: physical address 0x%jx not in minidump",
180 return (I386_PAGE_SIZE - offset);
182 _kvm_err(kd, kd->program,
183 "_i386_minidump_vatop_pae: virtual address 0x%jx not minidumped",
189 _kvm_err(kd, 0, "invalid address (0x%jx)", (uintmax_t)va);
194 _i386_minidump_vatop(kvm_t *kd, kvaddr_t va, off_t *pa)
197 i386_physaddr_t offset;
206 offset = va & I386_PAGE_MASK;
208 if (va >= vm->hdr.kernbase) {
209 pteindex = (va - vm->hdr.kernbase) >> I386_PAGE_SHIFT;
210 pte = le32toh(ptemap[pteindex]);
211 if ((pte & I386_PG_V) == 0) {
212 _kvm_err(kd, kd->program,
213 "_i386_minidump_vatop: pte not valid");
216 a = pte & I386_PG_FRAME;
217 ofs = _kvm_hpt_find(&vm->hpt, a);
219 _kvm_err(kd, kd->program,
220 "_i386_minidump_vatop: physical address 0x%jx not in minidump",
225 return (I386_PAGE_SIZE - offset);
227 _kvm_err(kd, kd->program,
228 "_i386_minidump_vatop: virtual address 0x%jx not minidumped",
234 _kvm_err(kd, 0, "invalid address (0x%jx)", (uintmax_t)va);
239 _i386_minidump_kvatop(kvm_t *kd, kvaddr_t va, off_t *pa)
243 _kvm_err(kd, 0, "_i386_minidump_kvatop called in live kernel!");
246 if (kd->vmst->hdr.paemode)
247 return (_i386_minidump_vatop_pae(kd, va, pa));
249 return (_i386_minidump_vatop(kd, va, pa));
252 struct kvm_arch kvm_i386_minidump = {
253 .ka_probe = _i386_minidump_probe,
254 .ka_initvtop = _i386_minidump_initvtop,
255 .ka_freevtop = _i386_minidump_freevtop,
256 .ka_kvatop = _i386_minidump_kvatop,
257 .ka_native = _i386_native,
260 KVM_ARCH(kvm_i386_minidump);