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
27 * AMD64 machine dependent routines for kvm and minidumps.
30 #include <sys/user.h> /* MUST BE FIRST */
31 #include <sys/param.h>
35 #include <sys/fnv_hash.h>
44 #include <vm/vm_param.h>
46 #include <machine/elf.h>
47 #include <machine/cpufunc.h>
48 #include <machine/minidump.h>
52 #include "kvm_private.h"
62 /* minidump must be the first item! */
64 int minidump; /* 1 = minidump mode */
65 struct minidumphdr hdr;
66 void *hpt_head[HPT_SIZE];
72 hpt_insert(kvm_t *kd, vm_paddr_t pa, int64_t off)
75 uint32_t fnv = FNV1_32_INIT;
77 fnv = fnv_32_buf(&pa, sizeof(pa), fnv);
78 fnv &= (HPT_SIZE - 1);
79 hpte = malloc(sizeof(*hpte));
82 hpte->next = kd->vmst->hpt_head[fnv];
83 kd->vmst->hpt_head[fnv] = hpte;
87 hpt_find(kvm_t *kd, vm_paddr_t pa)
90 uint32_t fnv = FNV1_32_INIT;
92 fnv = fnv_32_buf(&pa, sizeof(pa), fnv);
93 fnv &= (HPT_SIZE - 1);
94 for (hpte = kd->vmst->hpt_head[fnv]; hpte != NULL; hpte = hpte->next) {
102 inithash(kvm_t *kd, uint64_t *base, int len, off_t off)
108 for (idx = 0; idx < len / sizeof(*base); idx++) {
112 bits &= ~(1ul << bit);
113 pa = (idx * sizeof(*base) * NBBY + bit) * PAGE_SIZE;
114 hpt_insert(kd, pa, off);
122 _kvm_minidump_freevtop(kvm_t *kd)
124 struct vmstate *vm = kd->vmst;
135 _kvm_minidump_initvtop(kvm_t *kd)
137 struct vmstate *vmst;
140 vmst = _kvm_malloc(kd, sizeof(*vmst));
142 _kvm_err(kd, kd->program, "cannot allocate vm");
146 bzero(vmst, sizeof(*vmst));
148 if (pread(kd->pmfd, &vmst->hdr, sizeof(vmst->hdr), 0) !=
150 _kvm_err(kd, kd->program, "cannot read dump header");
153 if (strncmp(MINIDUMP_MAGIC, vmst->hdr.magic, sizeof(vmst->hdr.magic)) != 0) {
154 _kvm_err(kd, kd->program, "not a minidump for this platform");
157 if (vmst->hdr.version != MINIDUMP_VERSION) {
158 _kvm_err(kd, kd->program, "wrong minidump version. expected %d got %d",
159 MINIDUMP_VERSION, vmst->hdr.version);
163 /* Skip header and msgbuf */
164 off = PAGE_SIZE + round_page(vmst->hdr.msgbufsize);
166 vmst->bitmap = _kvm_malloc(kd, vmst->hdr.bitmapsize);
167 if (vmst->bitmap == NULL) {
168 _kvm_err(kd, kd->program, "cannot allocate %d bytes for bitmap", vmst->hdr.bitmapsize);
171 if (pread(kd->pmfd, vmst->bitmap, vmst->hdr.bitmapsize, off) !=
172 vmst->hdr.bitmapsize) {
173 _kvm_err(kd, kd->program, "cannot read %d bytes for page bitmap", vmst->hdr.bitmapsize);
176 off += round_page(vmst->hdr.bitmapsize);
178 vmst->ptemap = _kvm_malloc(kd, vmst->hdr.ptesize);
179 if (vmst->ptemap == NULL) {
180 _kvm_err(kd, kd->program, "cannot allocate %d bytes for ptemap", vmst->hdr.ptesize);
183 if (pread(kd->pmfd, vmst->ptemap, vmst->hdr.ptesize, off) !=
185 _kvm_err(kd, kd->program, "cannot read %d bytes for ptemap", vmst->hdr.ptesize);
188 off += vmst->hdr.ptesize;
190 /* build physical address hash table for sparse pages */
191 inithash(kd, vmst->bitmap, vmst->hdr.bitmapsize, off);
197 _kvm_minidump_vatop(kvm_t *kd, u_long va, off_t *pa)
207 offset = va & (PAGE_SIZE - 1);
209 if (va >= vm->hdr.kernbase) {
210 pteindex = (va - vm->hdr.kernbase) >> PAGE_SHIFT;
211 pte = vm->ptemap[pteindex];
212 if (((u_long)pte & PG_V) == 0) {
213 _kvm_err(kd, kd->program, "_kvm_vatop: pte not valid");
217 ofs = hpt_find(kd, a);
219 _kvm_err(kd, kd->program, "_kvm_vatop: physical address 0x%lx not in minidump", a);
223 return (PAGE_SIZE - offset);
224 } else if (va >= vm->hdr.dmapbase && va < vm->hdr.dmapend) {
225 a = (va - vm->hdr.dmapbase) & ~PAGE_MASK;
226 ofs = hpt_find(kd, a);
228 _kvm_err(kd, kd->program, "_kvm_vatop: direct map address 0x%lx not in minidump", va);
232 return (PAGE_SIZE - offset);
234 _kvm_err(kd, kd->program, "_kvm_vatop: virtual address 0x%lx not minidumped", va);
239 _kvm_err(kd, 0, "invalid address (0x%lx)", va);
244 _kvm_minidump_kvatop(kvm_t *kd, u_long va, off_t *pa)
246 if (kvm_ishost(kd)) {
247 _kvm_err(kd, 0, "kvm_vatop called in live kernel!");
251 return (_kvm_minidump_vatop(kd, va, pa));