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 * AMD64 machine dependent routines for kvm and minidumps.
33 #include <sys/param.h>
34 #include <sys/endian.h>
41 #include "../../sys/amd64/include/minidump.h"
45 #include "kvm_private.h"
46 #include "kvm_amd64.h"
48 #define amd64_round_page(x) roundup2((kvaddr_t)(x), AMD64_PAGE_SIZE)
51 struct minidumphdr hdr;
53 amd64_pte_t *page_map;
57 _amd64_minidump_probe(kvm_t *kd)
60 return (_kvm_probe_elf_kernel(kd, ELFCLASS64, EM_X86_64) &&
61 _kvm_is_minidump(kd));
65 _amd64_minidump_freevtop(kvm_t *kd)
67 struct vmstate *vm = kd->vmst;
69 _kvm_hpt_free(&vm->hpt);
77 _amd64_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");
100 * NB: amd64 minidump header is binary compatible between version 1
101 * and version 2; this may not be the case for the future versions.
103 vmst->hdr.version = le32toh(vmst->hdr.version);
104 if (vmst->hdr.version != MINIDUMP_VERSION && vmst->hdr.version != 1) {
105 _kvm_err(kd, kd->program, "wrong minidump version. expected %d got %d",
106 MINIDUMP_VERSION, vmst->hdr.version);
109 vmst->hdr.msgbufsize = le32toh(vmst->hdr.msgbufsize);
110 vmst->hdr.bitmapsize = le32toh(vmst->hdr.bitmapsize);
111 vmst->hdr.pmapsize = le32toh(vmst->hdr.pmapsize);
112 vmst->hdr.kernbase = le64toh(vmst->hdr.kernbase);
113 vmst->hdr.dmapbase = le64toh(vmst->hdr.dmapbase);
114 vmst->hdr.dmapend = le64toh(vmst->hdr.dmapend);
116 /* Skip header and msgbuf */
117 off = AMD64_PAGE_SIZE + amd64_round_page(vmst->hdr.msgbufsize);
119 bitmap = _kvm_malloc(kd, vmst->hdr.bitmapsize);
120 if (bitmap == NULL) {
121 _kvm_err(kd, kd->program, "cannot allocate %d bytes for bitmap", vmst->hdr.bitmapsize);
124 if (pread(kd->pmfd, bitmap, vmst->hdr.bitmapsize, off) !=
125 (ssize_t)vmst->hdr.bitmapsize) {
126 _kvm_err(kd, kd->program, "cannot read %d bytes for page bitmap", vmst->hdr.bitmapsize);
130 off += amd64_round_page(vmst->hdr.bitmapsize);
132 vmst->page_map = _kvm_malloc(kd, vmst->hdr.pmapsize);
133 if (vmst->page_map == NULL) {
134 _kvm_err(kd, kd->program, "cannot allocate %d bytes for page_map", vmst->hdr.pmapsize);
138 if (pread(kd->pmfd, vmst->page_map, vmst->hdr.pmapsize, off) !=
139 (ssize_t)vmst->hdr.pmapsize) {
140 _kvm_err(kd, kd->program, "cannot read %d bytes for page_map", vmst->hdr.pmapsize);
144 off += vmst->hdr.pmapsize;
146 /* build physical address hash table for sparse pages */
147 _kvm_hpt_init(kd, &vmst->hpt, bitmap, vmst->hdr.bitmapsize, off,
148 AMD64_PAGE_SIZE, sizeof(*bitmap));
155 _amd64_minidump_vatop_v1(kvm_t *kd, kvaddr_t va, off_t *pa)
158 amd64_physaddr_t offset;
165 offset = va & AMD64_PAGE_MASK;
167 if (va >= vm->hdr.kernbase) {
168 pteindex = (va - vm->hdr.kernbase) >> AMD64_PAGE_SHIFT;
169 if (pteindex >= vm->hdr.pmapsize / sizeof(*vm->page_map))
171 pte = le64toh(vm->page_map[pteindex]);
172 if ((pte & AMD64_PG_V) == 0) {
173 _kvm_err(kd, kd->program,
174 "_amd64_minidump_vatop_v1: pte not valid");
177 a = pte & AMD64_PG_FRAME;
178 ofs = _kvm_hpt_find(&vm->hpt, a);
180 _kvm_err(kd, kd->program,
181 "_amd64_minidump_vatop_v1: physical address 0x%jx not in minidump",
186 return (AMD64_PAGE_SIZE - offset);
187 } else if (va >= vm->hdr.dmapbase && va < vm->hdr.dmapend) {
188 a = (va - vm->hdr.dmapbase) & ~AMD64_PAGE_MASK;
189 ofs = _kvm_hpt_find(&vm->hpt, a);
191 _kvm_err(kd, kd->program,
192 "_amd64_minidump_vatop_v1: direct map address 0x%jx not in minidump",
197 return (AMD64_PAGE_SIZE - offset);
199 _kvm_err(kd, kd->program,
200 "_amd64_minidump_vatop_v1: virtual address 0x%jx not minidumped",
206 _kvm_err(kd, 0, "invalid address (0x%jx)", (uintmax_t)va);
211 _amd64_minidump_vatop(kvm_t *kd, kvaddr_t va, off_t *pa)
213 amd64_pte_t pt[AMD64_NPTEPG];
215 amd64_physaddr_t offset;
224 offset = va & AMD64_PAGE_MASK;
226 if (va >= vm->hdr.kernbase) {
227 pdeindex = (va - vm->hdr.kernbase) >> AMD64_PDRSHIFT;
228 if (pdeindex >= vm->hdr.pmapsize / sizeof(*vm->page_map))
230 pde = le64toh(vm->page_map[pdeindex]);
231 if ((pde & AMD64_PG_V) == 0) {
232 _kvm_err(kd, kd->program,
233 "_amd64_minidump_vatop: pde not valid");
236 if ((pde & AMD64_PG_PS) == 0) {
237 a = pde & AMD64_PG_FRAME;
238 ofs = _kvm_hpt_find(&vm->hpt, a);
240 _kvm_err(kd, kd->program,
241 "_amd64_minidump_vatop: pt physical address 0x%jx not in minidump",
245 /* TODO: Just read the single PTE */
246 if (pread(kd->pmfd, &pt, AMD64_PAGE_SIZE, ofs) !=
248 _kvm_err(kd, kd->program,
249 "cannot read %d bytes for page table",
253 pteindex = (va >> AMD64_PAGE_SHIFT) &
255 pte = le64toh(pt[pteindex]);
256 if ((pte & AMD64_PG_V) == 0) {
257 _kvm_err(kd, kd->program,
258 "_amd64_minidump_vatop: pte not valid");
261 a = pte & AMD64_PG_FRAME;
263 a = pde & AMD64_PG_PS_FRAME;
264 a += (va & AMD64_PDRMASK) ^ offset;
266 ofs = _kvm_hpt_find(&vm->hpt, a);
268 _kvm_err(kd, kd->program,
269 "_amd64_minidump_vatop: physical address 0x%jx not in minidump",
274 return (AMD64_PAGE_SIZE - offset);
275 } else if (va >= vm->hdr.dmapbase && va < vm->hdr.dmapend) {
276 a = (va - vm->hdr.dmapbase) & ~AMD64_PAGE_MASK;
277 ofs = _kvm_hpt_find(&vm->hpt, a);
279 _kvm_err(kd, kd->program,
280 "_amd64_minidump_vatop: direct map address 0x%jx not in minidump",
285 return (AMD64_PAGE_SIZE - offset);
287 _kvm_err(kd, kd->program,
288 "_amd64_minidump_vatop: virtual address 0x%jx not minidumped",
294 _kvm_err(kd, 0, "invalid address (0x%jx)", (uintmax_t)va);
299 _amd64_minidump_kvatop(kvm_t *kd, kvaddr_t va, off_t *pa)
304 "_amd64_minidump_kvatop called in live kernel!");
307 if (((struct vmstate *)kd->vmst)->hdr.version == 1)
308 return (_amd64_minidump_vatop_v1(kd, va, pa));
310 return (_amd64_minidump_vatop(kd, va, pa));
313 static struct kvm_arch kvm_amd64_minidump = {
314 .ka_probe = _amd64_minidump_probe,
315 .ka_initvtop = _amd64_minidump_initvtop,
316 .ka_freevtop = _amd64_minidump_freevtop,
317 .ka_kvatop = _amd64_minidump_kvatop,
318 .ka_native = _amd64_native,
321 KVM_ARCH(kvm_amd64_minidump);