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
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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/param.h>
34 #include <sys/fnv_hash.h>
43 #include <vm/vm_param.h>
45 #include <machine/elf.h>
46 #include <machine/cpufunc.h>
47 #include <machine/minidump.h>
51 #include "kvm_private.h"
53 #define PG_FRAME_PAE (~((uint64_t)PAGE_MASK))
63 /* minidump must be the first item! */
65 int minidump; /* 1 = minidump mode */
66 struct minidumphdr hdr;
67 void *hpt_head[HPT_SIZE];
73 hpt_insert(kvm_t *kd, uint64_t pa, int64_t off)
76 uint32_t fnv = FNV1_32_INIT;
78 fnv = fnv_32_buf(&pa, sizeof(pa), fnv);
79 fnv &= (HPT_SIZE - 1);
80 hpte = malloc(sizeof(*hpte));
83 hpte->next = kd->vmst->hpt_head[fnv];
84 kd->vmst->hpt_head[fnv] = hpte;
88 hpt_find(kvm_t *kd, uint64_t pa)
91 uint32_t fnv = FNV1_32_INIT;
93 fnv = fnv_32_buf(&pa, sizeof(pa), fnv);
94 fnv &= (HPT_SIZE - 1);
95 for (hpte = kd->vmst->hpt_head[fnv]; hpte != NULL; hpte = hpte->next) {
103 inithash(kvm_t *kd, uint32_t *base, int len, off_t off)
109 for (idx = 0; idx < len / sizeof(*base); idx++) {
113 bits &= ~(1ul << bit);
114 pa = (idx * sizeof(*base) * NBBY + bit) * PAGE_SIZE;
115 hpt_insert(kd, pa, off);
123 _kvm_minidump_freevtop(kvm_t *kd)
125 struct vmstate *vm = kd->vmst;
136 _kvm_minidump_initvtop(kvm_t *kd)
138 struct vmstate *vmst;
141 vmst = _kvm_malloc(kd, sizeof(*vmst));
143 _kvm_err(kd, kd->program, "cannot allocate vm");
147 bzero(vmst, sizeof(*vmst));
149 if (pread(kd->pmfd, &vmst->hdr, sizeof(vmst->hdr), 0) !=
151 _kvm_err(kd, kd->program, "cannot read dump header");
154 if (strncmp(MINIDUMP_MAGIC, vmst->hdr.magic, sizeof(vmst->hdr.magic)) != 0) {
155 _kvm_err(kd, kd->program, "not a minidump for this platform");
158 if (vmst->hdr.version != MINIDUMP_VERSION) {
159 _kvm_err(kd, kd->program, "wrong minidump version. expected %d got %d",
160 MINIDUMP_VERSION, vmst->hdr.version);
164 /* Skip header and msgbuf */
165 off = PAGE_SIZE + round_page(vmst->hdr.msgbufsize);
167 vmst->bitmap = _kvm_malloc(kd, vmst->hdr.bitmapsize);
168 if (vmst->bitmap == NULL) {
169 _kvm_err(kd, kd->program, "cannot allocate %d bytes for bitmap", vmst->hdr.bitmapsize);
172 if (pread(kd->pmfd, vmst->bitmap, vmst->hdr.bitmapsize, off) !=
173 vmst->hdr.bitmapsize) {
174 _kvm_err(kd, kd->program, "cannot read %d bytes for page bitmap", vmst->hdr.bitmapsize);
177 off += round_page(vmst->hdr.bitmapsize);
179 vmst->ptemap = _kvm_malloc(kd, vmst->hdr.ptesize);
180 if (vmst->ptemap == NULL) {
181 _kvm_err(kd, kd->program, "cannot allocate %d bytes for ptemap", vmst->hdr.ptesize);
184 if (pread(kd->pmfd, vmst->ptemap, vmst->hdr.ptesize, off) !=
186 _kvm_err(kd, kd->program, "cannot read %d bytes for ptemap", vmst->hdr.ptesize);
189 off += vmst->hdr.ptesize;
191 /* build physical address hash table for sparse pages */
192 inithash(kd, vmst->bitmap, vmst->hdr.bitmapsize, off);
198 _kvm_minidump_vatop(kvm_t *kd, u_long va, off_t *pa)
210 offset = va & (PAGE_SIZE - 1);
212 if (va >= vm->hdr.kernbase) {
213 pteindex = (va - vm->hdr.kernbase) >> PAGE_SHIFT;
214 pte = ptemap[pteindex];
215 if ((pte & PG_V) == 0) {
216 _kvm_err(kd, kd->program, "_kvm_vatop: pte not valid");
220 ofs = hpt_find(kd, a);
222 _kvm_err(kd, kd->program, "_kvm_vatop: physical address 0x%lx not in minidump", a);
226 return (PAGE_SIZE - offset);
228 _kvm_err(kd, kd->program, "_kvm_vatop: virtual address 0x%lx not minidumped", va);
233 _kvm_err(kd, 0, "invalid address (0x%lx)", va);
238 _kvm_minidump_kvatop(kvm_t *kd, u_long va, off_t *pa)
241 if (kvm_ishost(kd)) {
242 _kvm_err(kd, 0, "vatop called in live kernel!");
246 return (_kvm_minidump_vatop(kd, va, pa));