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>
43 #include <vm/vm_param.h>
45 #include <machine/elf.h>
46 #include <machine/cpufunc.h>
47 #include <machine/minidump.h>
52 #include "kvm_private.h"
62 /* minidump must be the first item! */
64 int minidump; /* 1 = minidump mode */
65 int pgtable; /* pagetable mode */
66 void *hpt_head[HPT_SIZE];
76 hpt_insert(kvm_t *kd, vm_paddr_t pa, int64_t off)
79 uint32_t fnv = FNV1_32_INIT;
81 fnv = fnv_32_buf(&pa, sizeof(pa), fnv);
82 fnv &= (HPT_SIZE - 1);
83 hpte = malloc(sizeof(*hpte));
86 hpte->next = kd->vmst->hpt_head[fnv];
87 kd->vmst->hpt_head[fnv] = hpte;
91 hpt_find(kvm_t *kd, vm_paddr_t pa)
94 uint32_t fnv = FNV1_32_INIT;
96 fnv = fnv_32_buf(&pa, sizeof(pa), fnv);
97 fnv &= (HPT_SIZE - 1);
98 for (hpte = kd->vmst->hpt_head[fnv]; hpte != NULL; hpte = hpte->next) {
106 inithash(kvm_t *kd, uint64_t *base, int len, off_t off)
112 for (idx = 0; idx < len / sizeof(*base); idx++) {
116 bits &= ~(1ul << bit);
117 pa = (idx * sizeof(*base) * NBBY + bit) * PAGE_SIZE;
118 hpt_insert(kd, pa, off);
126 _kvm_minidump_freevtop(kvm_t *kd)
128 struct vmstate *vm = kd->vmst;
138 static int _kvm_minidump_init_hdr1(kvm_t *kd, struct vmstate *vmst,
139 struct minidumphdr1 *hdr);
140 static int _kvm_minidump_init_hdr2(kvm_t *kd, struct vmstate *vmst,
141 struct minidumphdr2 *hdr);
144 _kvm_minidump_initvtop(kvm_t *kd)
146 struct vmstate *vmst;
149 struct minidumphdr1 hdr1;
150 struct minidumphdr2 hdr2;
153 vmst = _kvm_malloc(kd, sizeof(*vmst));
155 _kvm_err(kd, kd->program, "cannot allocate vm");
159 bzero(vmst, sizeof(*vmst));
162 if (pread(kd->pmfd, &u, sizeof(u), 0) != sizeof(u)) {
163 _kvm_err(kd, kd->program, "cannot read dump header");
166 if (strncmp(MINIDUMP1_MAGIC, u.hdr1.magic, sizeof(u.hdr1.magic)) == 0 &&
167 u.hdr1.version == MINIDUMP1_VERSION) {
168 error = _kvm_minidump_init_hdr1(kd, vmst, &u.hdr1);
170 if (strncmp(MINIDUMP2_MAGIC, u.hdr1.magic, sizeof(u.hdr1.magic)) == 0 &&
171 u.hdr2.version == MINIDUMP2_VERSION) {
172 error = _kvm_minidump_init_hdr2(kd, vmst, &u.hdr2);
174 _kvm_err(kd, kd->program, "not a minidump for this platform");
182 _kvm_minidump_init_hdr1(kvm_t *kd, struct vmstate *vmst,
183 struct minidumphdr1 *hdr)
187 /* Skip header and msgbuf */
188 off = PAGE_SIZE + round_page(hdr->msgbufsize);
190 vmst->bitmap = _kvm_malloc(kd, hdr->bitmapsize);
191 if (vmst->bitmap == NULL) {
192 _kvm_err(kd, kd->program,
193 "cannot allocate %jd bytes for bitmap",
194 (intmax_t)hdr->bitmapsize);
197 if (pread(kd->pmfd, vmst->bitmap, hdr->bitmapsize, off) !=
199 _kvm_err(kd, kd->program,
200 "cannot read %jd bytes for page bitmap",
201 (intmax_t)hdr->bitmapsize);
204 off += round_page(vmst->bitmapsize);
206 vmst->ptemap = _kvm_malloc(kd, hdr->ptesize);
207 if (vmst->ptemap == NULL) {
208 _kvm_err(kd, kd->program,
209 "cannot allocate %jd bytes for ptemap",
210 (intmax_t)hdr->ptesize);
213 if (pread(kd->pmfd, vmst->ptemap, hdr->ptesize, off) !=
215 _kvm_err(kd, kd->program,
216 "cannot read %jd bytes for ptemap",
217 (intmax_t)hdr->ptesize);
222 vmst->kernbase = hdr->kernbase;
223 vmst->dmapbase = hdr->dmapbase;
224 vmst->dmapend = hdr->dmapend;
225 vmst->bitmapsize = hdr->bitmapsize;
228 /* build physical address hash table for sparse pages */
229 inithash(kd, vmst->bitmap, hdr->bitmapsize, off);
236 _kvm_minidump_init_hdr2(kvm_t *kd, struct vmstate *vmst,
237 struct minidumphdr2 *hdr)
241 /* Skip header and msgbuf */
242 off = PAGE_SIZE + round_page(hdr->msgbufsize);
244 vmst->bitmap = _kvm_malloc(kd, hdr->bitmapsize);
245 if (vmst->bitmap == NULL) {
246 _kvm_err(kd, kd->program,
247 "cannot allocate %jd bytes for bitmap",
248 (intmax_t)hdr->bitmapsize);
251 if (pread(kd->pmfd, vmst->bitmap, hdr->bitmapsize, off) !=
252 (intmax_t)hdr->bitmapsize) {
253 _kvm_err(kd, kd->program,
254 "cannot read %jd bytes for page bitmap",
255 (intmax_t)hdr->bitmapsize);
258 off += round_page(hdr->bitmapsize);
260 vmst->ptemap = _kvm_malloc(kd, hdr->ptesize);
261 if (vmst->ptemap == NULL) {
262 _kvm_err(kd, kd->program,
263 "cannot allocate %jd bytes for ptemap",
264 (intmax_t)hdr->ptesize);
267 if (pread(kd->pmfd, vmst->ptemap, hdr->ptesize, off) !=
268 (intmax_t)hdr->ptesize) {
269 _kvm_err(kd, kd->program,
270 "cannot read %jd bytes for ptemap",
271 (intmax_t)hdr->ptesize);
276 vmst->kernbase = hdr->kernbase;
277 vmst->dmapbase = hdr->dmapbase;
278 vmst->bitmapsize = hdr->bitmapsize;
281 /* build physical address hash table for sparse pages */
282 inithash(kd, vmst->bitmap, hdr->bitmapsize, off);
288 _kvm_minidump_vatop(kvm_t *kd, u_long va, off_t *pa)
298 offset = va & (PAGE_SIZE - 1);
300 if (va >= vm->kernbase) {
301 switch (vm->pgtable) {
304 * Page tables are specifically dumped (old style)
306 pteindex = (va - vm->kernbase) >> PAGE_SHIFT;
307 pte = vm->ptemap[pteindex];
308 if (((u_long)pte & X86_PG_V) == 0) {
309 _kvm_err(kd, kd->program,
310 "_kvm_vatop: pte not valid");
317 * Kernel page table pages are included in the
318 * sparse map. We only dump the contents of
319 * the PDs (zero-filling any empty entries).
321 * Index of PD entry in PDP & PDP in PML4E together.
323 * First shift by 30 (1GB) - gives us an index
324 * into PD entries. We do not PDP entries in the
325 * PML4E, so there are 512 * 512 PD entries possible.
327 pteindex = (va >> PDPSHIFT) & (512 * 512 - 1);
328 pte = vm->ptemap[pteindex];
329 if ((pte & X86_PG_V) == 0) {
330 _kvm_err(kd, kd->program,
331 "_kvm_vatop: pd not valid");
334 if (pte & X86_PG_PS) { /* 1GB pages */
335 pte += va & (1024 * 1024 * 1024 - 1);
338 ofs = hpt_find(kd, pte & PG_FRAME);
340 _kvm_err(kd, kd->program,
341 "_kvm_vatop: no phys page for pd");
346 * Index of PT entry in PD
348 pteindex = (va >> PDRSHIFT) & 511;
349 if (pread(kd->pmfd, &pte, sizeof(pte),
350 ofs + pteindex * sizeof(pte)) != sizeof(pte)) {
351 _kvm_err(kd, kd->program,
352 "_kvm_vatop: pd lookup not valid");
355 if ((pte & X86_PG_V) == 0) {
356 _kvm_err(kd, kd->program,
357 "_kvm_vatop: pt not valid");
360 if (pte & X86_PG_PS) { /* 2MB pages */
361 pte += va & (2048 * 1024 - 1);
364 ofs = hpt_find(kd, pte & PG_FRAME);
366 _kvm_err(kd, kd->program,
367 "_kvm_vatop: no phys page for pt");
372 * Index of pte entry in PT
374 pteindex = (va >> PAGE_SHIFT) & 511;
375 if (pread(kd->pmfd, &pte, sizeof(pte),
376 ofs + pteindex * sizeof(pte)) != sizeof(pte)) {
377 _kvm_err(kd, kd->program,
378 "_kvm_vatop: pte lookup not valid");
389 _kvm_err(kd, kd->program,
390 "_kvm_vatop: bad pgtable mode ");
393 ofs = hpt_find(kd, a);
395 _kvm_err(kd, kd->program, "_kvm_vatop: physical address 0x%lx not in minidump", a);
399 return (PAGE_SIZE - offset);
400 } else if (va >= vm->dmapbase && va < vm->dmapend) {
401 a = (va - vm->dmapbase) & ~PAGE_MASK;
402 ofs = hpt_find(kd, a);
404 _kvm_err(kd, kd->program, "_kvm_vatop: direct map address 0x%lx not in minidump", va);
408 return (PAGE_SIZE - offset);
410 _kvm_err(kd, kd->program, "_kvm_vatop: virtual address 0x%lx not minidumped", va);
415 _kvm_err(kd, 0, "invalid address (0x%lx)", va);
420 _kvm_minidump_kvatop(kvm_t *kd, u_long va, off_t *pa)
422 if (kvm_ishost(kd)) {
423 _kvm_err(kd, 0, "kvm_vatop called in live kernel!");
427 return (_kvm_minidump_vatop(kd, va, pa));