VirtualBox

source: vbox/trunk/src/VBox/VMM/DBGFCoreWrite.cpp@ 34904

Last change on this file since 34904 was 34902, checked in by vboxsync, 14 years ago

IMachineDebugger::dumpGuestCore: Added DBGFR3CoreWrite interface.

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1/* $Id: DBGFCoreWrite.cpp 34902 2010-12-09 16:16:51Z vboxsync $ */
2/** @file
3 * DBGF - Debugger Facility, Guest Core Dump.
4 */
5
6/*
7 * Copyright (C) 2010 Oracle Corporation
8 *
9 * This file is part of VirtualBox Open Source Edition (OSE), as
10 * available from http://www.virtualbox.org. This file is free software;
11 * you can redistribute it and/or modify it under the terms of the GNU
12 * General Public License (GPL) as published by the Free Software
13 * Foundation, in version 2 as it comes in the "COPYING" file of the
14 * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15 * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16 */
17
18/** @page pg_dbgf_vmcore VMCore Format
19 *
20 * The VirtualBox VMCore Format:
21 * [ ELF 64 Header] -- Only 1
22 *
23 * [ PT_NOTE ] -- Only 1
24 * - Offset into CoreDescriptor followed by list of Notes (Note Hdr + data) of VBox CPUs.
25 * - (Any Additional custom Note sections).
26 *
27 * [ PT_LOAD ] -- One for each contiguous memory chunk
28 * - Memory offset (physical).
29 * - File offset.
30 *
31 * CoreDescriptor
32 * - Magic, VBox version.
33 * - Number of CPus.
34 *
35 * Per-CPU register dump
36 * - CPU 1 Note Hdr + Data.
37 * - CPU 2 Note Hdr + Data.
38 * ...
39 * (Additional custom notes Hdr+data)
40 * - VBox 1 Note Hdr + Data.
41 * - VBox 2 Note Hdr + Data.
42 * ...
43 * Memory dump
44 *
45 */
46
47/*******************************************************************************
48* Header Files *
49*******************************************************************************/
50#define LOG_GROUP LOG_GROUP_DBGF
51#include <iprt/param.h>
52#include <iprt/file.h>
53
54#include "DBGFInternal.h"
55
56#include <VBox/cpum.h>
57#include "CPUMInternal.h"
58#include <VBox/dbgf.h>
59#include <VBox/dbgfcorefmt.h>
60#include <VBox/vm.h>
61#include <VBox/pgm.h>
62#include <VBox/err.h>
63#include <VBox/log.h>
64#include <VBox/mm.h>
65#include <VBox/version.h>
66
67#include "../Runtime/include/internal/ldrELF64.h"
68
69
70/*******************************************************************************
71* Defined Constants And Macros *
72*******************************************************************************/
73#ifdef DEBUG_ramshankar
74# undef Log
75# define Log LogRel
76#endif
77#define DBGFLOG_NAME "DBGFCoreWrite"
78
79
80/*******************************************************************************
81* Global Variables *
82*******************************************************************************/
83static const int s_NoteAlign = 8;
84static const int s_cbNoteName = 16;
85
86/* These strings *HAVE* to be 8-byte aligned */
87static const char *s_pcszCoreVBoxCore = "VBCORE";
88static const char *s_pcszCoreVBoxCpu = "VBCPU";
89
90
91/*******************************************************************************
92* Structures and Typedefs *
93*******************************************************************************/
94/**
95 * Guest core writer data.
96 *
97 * Used to pass parameters from DBGFR3CoreWrite to dbgfR3CoreWriteRendezvous.
98 */
99typedef struct DBGFCOREDATA
100{
101 /** The name of the file to write the file to. */
102 const char *pszFilename;
103 /** Whether to replace (/overwrite) any existing file. */
104 bool fReplaceFile;
105} DBGFCOREDATA;
106/** Pointer to the guest core writer data. */
107typedef DBGFCOREDATA *PDBGFCOREDATA;
108
109
110
111/**
112 * ELF function to write 64-bit ELF header.
113 *
114 * @param hFile The file to write to.
115 * @param cProgHdrs Number of program headers.
116 * @param cSecHdrs Number of section headers.
117 *
118 * @return IPRT status code.
119 */
120static int Elf64WriteElfHdr(RTFILE hFile, uint16_t cProgHdrs, uint16_t cSecHdrs)
121{
122 Elf64_Ehdr ElfHdr;
123 RT_ZERO(ElfHdr);
124 ElfHdr.e_ident[EI_MAG0] = ELFMAG0;
125 ElfHdr.e_ident[EI_MAG1] = ELFMAG1;
126 ElfHdr.e_ident[EI_MAG2] = ELFMAG2;
127 ElfHdr.e_ident[EI_MAG3] = ELFMAG3;
128 ElfHdr.e_ident[EI_DATA] = ELFDATA2LSB;
129 ElfHdr.e_type = ET_CORE;
130 ElfHdr.e_version = EV_CURRENT;
131 ElfHdr.e_ident[EI_CLASS] = ELFCLASS64;
132 /* 32-bit builds will produce cores with e_machine EM_386. */
133#ifdef RT_ARCH_AMD64
134 ElfHdr.e_machine = EM_X86_64;
135#else
136 ElfHdr.e_machine = EM_386;
137#endif
138 ElfHdr.e_phnum = cProgHdrs;
139 ElfHdr.e_shnum = cSecHdrs;
140 ElfHdr.e_ehsize = sizeof(ElfHdr);
141 ElfHdr.e_phoff = sizeof(ElfHdr);
142 ElfHdr.e_phentsize = sizeof(Elf64_Phdr);
143 ElfHdr.e_shentsize = sizeof(Elf64_Shdr);
144
145 return RTFileWrite(hFile, &ElfHdr, sizeof(ElfHdr), NULL /* all */);
146}
147
148
149/**
150 * ELF function to write 64-bit program header.
151 *
152 * @param hFile The file to write to.
153 * @param Type Type of program header (PT_*).
154 * @param fFlags Flags (access permissions, PF_*).
155 * @param offFileData File offset of contents.
156 * @param cbFileData Size of contents in the file.
157 * @param cbMemData Size of contents in memory.
158 * @param Phys Physical address, pass zero if not applicable.
159 *
160 * @return IPRT status code.
161 */
162static int Elf64WriteProgHdr(RTFILE hFile, uint32_t Type, uint32_t fFlags, uint64_t offFileData, uint64_t cbFileData,
163 uint64_t cbMemData, RTGCPHYS Phys)
164{
165 Elf64_Phdr ProgHdr;
166 RT_ZERO(ProgHdr);
167 ProgHdr.p_type = Type;
168 ProgHdr.p_flags = fFlags;
169 ProgHdr.p_offset = offFileData;
170 ProgHdr.p_filesz = cbFileData;
171 ProgHdr.p_memsz = cbMemData;
172 ProgHdr.p_paddr = Phys;
173
174 return RTFileWrite(hFile, &ProgHdr, sizeof(ProgHdr), NULL /* all */);
175}
176
177
178/**
179 * Returns the size of the NOTE section given the name and size of the data.
180 *
181 * @param pszName Name of the note section.
182 * @param cb Size of the data portion of the note section.
183 *
184 * @return The size of the NOTE section as rounded to the file alignment.
185 */
186static uint64_t Elf64NoteSectionSize(const char *pszName, uint64_t cbData)
187{
188 uint64_t cbNote = sizeof(Elf64_Nhdr);
189
190 size_t cchName = strlen(pszName) + 1;
191 size_t cchNameAlign = RT_ALIGN_Z(cchName, s_NoteAlign);
192
193 cbNote += cchNameAlign;
194 cbNote += RT_ALIGN_64(cbData, s_NoteAlign);
195 return cbNote;
196}
197
198
199/**
200 * Elf function to write 64-bit note header.
201 *
202 * @param hFile The file to write to.
203 * @param Type Type of this section.
204 * @param pszName Name of this section.
205 * @param pcv Opaque pointer to the data, if NULL only computes size.
206 * @param cbData Size of the data.
207 *
208 * @return IPRT status code.
209 */
210static int Elf64WriteNoteHdr(RTFILE hFile, uint16_t Type, const char *pszName, const void *pcvData, uint64_t cbData)
211{
212 AssertReturn(pcvData, VERR_INVALID_POINTER);
213 AssertReturn(cbData > 0, VERR_NO_DATA);
214
215 char szNoteName[s_cbNoteName];
216 RT_ZERO(szNoteName);
217 RTStrCopy(szNoteName, sizeof(szNoteName), pszName);
218
219 size_t cchName = strlen(szNoteName) + 1;
220 size_t cchNameAlign = RT_ALIGN_Z(cchName, s_NoteAlign);
221 uint64_t cbDataAlign = RT_ALIGN_64(cbData, s_NoteAlign);
222
223 /*
224 * Yell loudly and bail if we are going to be writing a core file that is not compatible with
225 * both Solaris and the 64-bit ELF spec. which dictates 8-byte alignment. See #5211 comment 3.
226 */
227 if (cchNameAlign - cchName > 3)
228 {
229 LogRel((DBGFLOG_NAME ": Elf64WriteNoteHdr pszName=%s cchName=%u cchNameAlign=%u, cchName aligns to 4 not 8-bytes!\n", pszName, cchName,
230 cchNameAlign));
231 return VERR_INVALID_PARAMETER;
232 }
233
234 if (cbDataAlign - cbData > 3)
235 {
236 LogRel((DBGFLOG_NAME ": Elf64WriteNoteHdr pszName=%s cbData=%u cbDataAlign=%u, cbData aligns to 4 not 8-bytes!\n", pszName, cbData,
237 cbDataAlign));
238 return VERR_INVALID_PARAMETER;
239 }
240
241 static const char s_achPad[7] = { 0, 0, 0, 0, 0, 0, 0 };
242 AssertCompile(sizeof(s_achPad) >= s_NoteAlign - 1);
243
244 Elf64_Nhdr ElfNoteHdr;
245 RT_ZERO(ElfNoteHdr);
246 ElfNoteHdr.n_namesz = (Elf64_Word)cchName - 1; /* Again a discrepancy between ELF-64 and Solaris (#5211 comment 3), we will follow ELF-64 */
247 ElfNoteHdr.n_type = Type;
248 ElfNoteHdr.n_descsz = (Elf64_Word)cbDataAlign;
249
250 /*
251 * Write note header.
252 */
253 int rc = RTFileWrite(hFile, &ElfNoteHdr, sizeof(ElfNoteHdr), NULL /* all */);
254 if (RT_SUCCESS(rc))
255 {
256 /*
257 * Write note name.
258 */
259 rc = RTFileWrite(hFile, szNoteName, cchName, NULL /* all */);
260 if (RT_SUCCESS(rc))
261 {
262 /*
263 * Write note name padding if required.
264 */
265 if (cchNameAlign > cchName)
266 rc = RTFileWrite(hFile, s_achPad, cchNameAlign - cchName, NULL);
267
268 if (RT_SUCCESS(rc))
269 {
270 /*
271 * Write note data.
272 */
273 rc = RTFileWrite(hFile, pcvData, cbData, NULL /* all */);
274 if (RT_SUCCESS(rc))
275 {
276 /*
277 * Write note data padding if required.
278 */
279 if (cbDataAlign > cbData)
280 rc = RTFileWrite(hFile, s_achPad, cbDataAlign - cbData, NULL /* all*/);
281 }
282 }
283 }
284 }
285
286 if (RT_FAILURE(rc))
287 LogRel((DBGFLOG_NAME ": RTFileWrite failed. rc=%Rrc pszName=%s cchName=%u cchNameAlign=%u cbData=%u cbDataAlign=%u\n",
288 rc, pszName, cchName, cchNameAlign, cbData, cbDataAlign));
289
290 return rc;
291}
292
293
294/**
295 * Count the number of memory ranges that go into the core file.
296 *
297 * We cannot do a page-by-page dump of the entire guest memory as there will be
298 * way too many program header entries. Also we don't want to dump MMIO regions
299 * which means we cannot have a 1:1 mapping between core file offset and memory
300 * offset. Instead we dump the memory in ranges. A memory range is a contiguous
301 * memory area suitable for dumping to a core file.
302 *
303 * @param pVM The VM handle.
304 *
305 * @return Number of memory ranges
306 */
307static uint32_t dbgfR3GetRamRangeCount(PVM pVM)
308{
309 return PGMR3PhysGetRamRangeCount(pVM);
310}
311
312
313/**
314 * Worker function for dbgfR3CoreWrite which does the writing.
315 *
316 * @returns VBox status code
317 * @param pVM The VM handle.
318 * @param hFile The file to write to. Caller closes this.
319 */
320static int dbgfR3CoreWriteWorker(PVM pVM, RTFILE hFile)
321{
322 /*
323 * Collect core information.
324 */
325 uint32_t const cu32MemRanges = dbgfR3GetRamRangeCount(pVM);
326 uint16_t const cMemRanges = cu32MemRanges < UINT16_MAX - 1 ? cu32MemRanges : UINT16_MAX - 1; /* One PT_NOTE Program header */
327 uint16_t const cProgHdrs = cMemRanges + 1;
328
329 DBGFCOREDESCRIPTOR CoreDescriptor;
330 RT_ZERO(CoreDescriptor);
331 CoreDescriptor.u32Magic = DBGFCORE_MAGIC;
332 CoreDescriptor.u32FmtVersion = DBGFCORE_FMT_VERSION;
333 CoreDescriptor.cbSelf = sizeof(CoreDescriptor);
334 CoreDescriptor.u32VBoxVersion = VBOX_FULL_VERSION;
335 CoreDescriptor.u32VBoxRevision = VMMGetSvnRev();
336 CoreDescriptor.cCpus = pVM->cCpus;
337
338 Log((DBGFLOG_NAME ": CoreDescriptor Version=%u Revision=%u\n", CoreDescriptor.u32VBoxVersion, CoreDescriptor.u32VBoxRevision));
339
340 /*
341 * Compute the file layout (see pg_dbgf_vmcore).
342 */
343 uint64_t const offElfHdr = RTFileTell(hFile);
344 uint64_t const offNoteSection = offElfHdr + sizeof(Elf64_Ehdr);
345 uint64_t const offLoadSections = offNoteSection + sizeof(Elf64_Phdr);
346 uint64_t const cbLoadSections = cMemRanges * sizeof(Elf64_Phdr);
347 uint64_t const offCoreDescriptor= offLoadSections + cbLoadSections;
348 uint64_t const cbCoreDescriptor = Elf64NoteSectionSize(s_pcszCoreVBoxCore, sizeof(CoreDescriptor));
349 uint64_t const offCpuDumps = offCoreDescriptor + cbCoreDescriptor;
350 uint64_t const cbCpuDumps = pVM->cCpus * Elf64NoteSectionSize(s_pcszCoreVBoxCpu, sizeof(CPUMCTX));
351 uint64_t const offMemory = offCpuDumps + cbCpuDumps;
352
353 uint64_t const offNoteSectionData = offCoreDescriptor;
354 uint64_t const cbNoteSectionData = cbCoreDescriptor + cbCpuDumps;
355
356 /*
357 * Write ELF header.
358 */
359 int rc = Elf64WriteElfHdr(hFile, cProgHdrs, 0 /* cSecHdrs */);
360 if (RT_FAILURE(rc))
361 {
362 LogRel((DBGFLOG_NAME ": Elf64WriteElfHdr failed. rc=%Rrc\n", rc));
363 return rc;
364 }
365
366 /*
367 * Write PT_NOTE program header.
368 */
369 Assert(RTFileTell(hFile) == offNoteSection);
370 rc = Elf64WriteProgHdr(hFile, PT_NOTE, PF_R,
371 offNoteSectionData, /* file offset to contents */
372 cbNoteSectionData, /* size in core file */
373 cbNoteSectionData, /* size in memory */
374 0); /* physical address */
375 if (RT_FAILURE(rc))
376 {
377 LogRel((DBGFLOG_NAME ": Elf64WritreProgHdr failed for PT_NOTE. rc=%Rrc\n", rc));
378 return rc;
379 }
380
381 /*
382 * Write PT_LOAD program header for each memory range.
383 */
384 Assert(RTFileTell(hFile) == offLoadSections);
385 uint64_t offMemRange = offMemory;
386 for (uint16_t iRange = 0; iRange < cMemRanges; iRange++)
387 {
388 RTGCPHYS GCPhysStart;
389 RTGCPHYS GCPhysEnd;
390 bool fIsMmio;
391 rc = PGMR3PhysGetRange(pVM, iRange, &GCPhysStart, &GCPhysEnd, NULL /* pszDesc */, &fIsMmio);
392 if (RT_FAILURE(rc))
393 {
394 LogRel((DBGFLOG_NAME ": PGMR3PhysGetRange failed for iRange(%u) rc=%Rrc\n", iRange, rc));
395 return rc;
396 }
397
398 uint64_t cbMemRange = GCPhysEnd - GCPhysStart + 1;
399 uint64_t cbFileRange = fIsMmio ? 0 : cbMemRange;
400
401 Log((DBGFLOG_NAME ": PGMR3PhysGetRange iRange=%u GCPhysStart=%#x GCPhysEnd=%#x cbMemRange=%u\n",
402 iRange, GCPhysStart, GCPhysEnd, cbMemRange));
403
404 rc = Elf64WriteProgHdr(hFile, PT_LOAD, PF_R,
405 offMemRange, /* file offset to contents */
406 cbFileRange, /* size in core file */
407 cbMemRange, /* size in memory */
408 GCPhysStart); /* physical address */
409 if (RT_FAILURE(rc))
410 {
411 LogRel((DBGFLOG_NAME ": Elf64WriteProgHdr failed for memory range(%u) cbFileRange=%u cbMemRange=%u rc=%Rrc\n",
412 iRange, cbFileRange, cbMemRange, rc));
413 return rc;
414 }
415
416 offMemRange += cbFileRange;
417 }
418
419 /*
420 * Write the Core descriptor note header and data.
421 */
422 Assert(RTFileTell(hFile) == offCoreDescriptor);
423 rc = Elf64WriteNoteHdr(hFile, NT_VBOXCORE, s_pcszCoreVBoxCore, &CoreDescriptor, sizeof(CoreDescriptor));
424 if (RT_FAILURE(rc))
425 {
426 LogRel((DBGFLOG_NAME ": Elf64WriteNoteHdr failed for Note '%s' rc=%Rrc\n", s_pcszCoreVBoxCore, rc));
427 return rc;
428 }
429
430 /*
431 * Write the CPU context note headers and data.
432 */
433 Assert(RTFileTell(hFile) == offCpuDumps);
434 for (uint32_t iCpu = 0; iCpu < pVM->cCpus; iCpu++)
435 {
436 PCPUMCTX pCpuCtx = &pVM->aCpus[iCpu].cpum.s.Guest;
437 rc = Elf64WriteNoteHdr(hFile, NT_VBOXCPU, s_pcszCoreVBoxCpu, pCpuCtx, sizeof(CPUMCTX));
438 if (RT_FAILURE(rc))
439 {
440 LogRel((DBGFLOG_NAME ": Elf64WriteNoteHdr failed for vCPU[%u] rc=%Rrc\n", iCpu, rc));
441 return rc;
442 }
443 }
444
445 /*
446 * Write memory ranges.
447 */
448 Assert(RTFileTell(hFile) == offMemory);
449 for (uint16_t iRange = 0; iRange < cMemRanges; iRange++)
450 {
451 RTGCPHYS GCPhysStart;
452 RTGCPHYS GCPhysEnd;
453 bool fIsMmio;
454 rc = PGMR3PhysGetRange(pVM, iRange, &GCPhysStart, &GCPhysEnd, NULL /* pszDesc */, &fIsMmio);
455 if (RT_FAILURE(rc))
456 {
457 LogRel((DBGFLOG_NAME ": PGMR3PhysGetRange(2) failed for iRange(%u) rc=%Rrc\n", iRange, rc));
458 return rc;
459 }
460
461 if (fIsMmio)
462 continue;
463
464 /*
465 * Write page-by-page of this memory range.
466 *
467 * The read function may fail on MMIO ranges, we write these as zero
468 * pages for now (would be nice to have the VGA bits there though).
469 */
470 uint64_t cbMemRange = GCPhysEnd - GCPhysStart + 1;
471 uint64_t cPages = cbMemRange >> PAGE_SHIFT;
472 for (uint64_t iPage = 0; iPage < cPages; iPage++)
473 {
474 uint8_t abPage[PAGE_SIZE];
475 rc = PGMPhysSimpleReadGCPhys(pVM, abPage, GCPhysStart + (iPage << PAGE_SHIFT), sizeof(abPage));
476 if (RT_FAILURE(rc))
477 {
478 if (rc != VERR_PGM_PHYS_PAGE_RESERVED)
479 LogRel((DBGFLOG_NAME ": PGMPhysRead failed for iRange=%u iPage=%u. rc=%Rrc. Ignoring...\n", iRange, iPage, rc));
480 RT_ZERO(abPage);
481 }
482
483 rc = RTFileWrite(hFile, abPage, sizeof(abPage), NULL /* all */);
484 if (RT_FAILURE(rc))
485 {
486 LogRel((DBGFLOG_NAME ": RTFileWrite failed. iRange=%u iPage=%u rc=%Rrc\n", iRange, iPage, rc));
487 return rc;
488 }
489 }
490 }
491
492 return rc;
493}
494
495
496/**
497 * EMT Rendezvous worker function for DBGFR3CoreWrite.
498 *
499 * @param pVM The VM handle.
500 * @param pVCpu The handle of the calling VCPU.
501 * @param pvData Opaque data.
502 *
503 * @return VBox status code.
504 */
505static DECLCALLBACK(VBOXSTRICTRC) dbgfR3CoreWriteRendezvous(PVM pVM, PVMCPU pVCpu, void *pvData)
506{
507 /*
508 * Validate input.
509 */
510 AssertReturn(pVM, VERR_INVALID_VM_HANDLE);
511 AssertReturn(pVCpu, VERR_INVALID_VMCPU_HANDLE);
512 AssertReturn(pvData, VERR_INVALID_POINTER);
513
514 PDBGFCOREDATA pDbgfData = (PDBGFCOREDATA)pvData;
515
516 /*
517 * Create the core file.
518 */
519 uint32_t fFlags = (pDbgfData->fReplaceFile ? RTFILE_O_CREATE_REPLACE : RTFILE_O_CREATE)
520 | RTFILE_O_WRITE
521 | RTFILE_O_DENY_ALL
522 | (0600 << RTFILE_O_CREATE_MODE_SHIFT);
523 RTFILE hFile;
524 int rc = RTFileOpen(&hFile, pDbgfData->pszFilename, fFlags);
525 if (RT_SUCCESS(rc))
526 {
527 rc = dbgfR3CoreWriteWorker(pVM, hFile);
528 RTFileClose(hFile);
529 }
530 else
531 LogRel((DBGFLOG_NAME ": RTFileOpen failed for '%s' rc=%Rrc\n", pDbgfData->pszFilename, rc));
532 return rc;
533}
534
535
536/**
537 * Write core dump of the guest.
538 *
539 * @returns VBox status code.
540 * @param pVM The VM handle.
541 * @param pszFilename The name of the file to which the guest core
542 * dump should be written.
543 * @param fReplaceFile Whether to replace the file or not.
544 *
545 * @remarks The VM should be suspended before calling this function or DMA may
546 * interfer with the state.
547 */
548VMMR3DECL(int) DBGFR3CoreWrite(PVM pVM, const char *pszFilename, bool fReplaceFile)
549{
550 VM_ASSERT_VALID_EXT_RETURN(pVM, VERR_INVALID_VM_HANDLE);
551 AssertReturn(pszFilename, VERR_INVALID_HANDLE);
552
553 /*
554 * Pass the core write request down to EMT rendezvous which makes sure
555 * other EMTs, if any, are not running. IO threads could still be running
556 * but we don't care about them.
557 */
558 DBGFCOREDATA CoreData;
559 RT_ZERO(CoreData);
560 CoreData.pszFilename = pszFilename;
561 CoreData.fReplaceFile = fReplaceFile;
562
563 int rc = VMMR3EmtRendezvous(pVM, VMMEMTRENDEZVOUS_FLAGS_TYPE_ONCE, dbgfR3CoreWriteRendezvous, &CoreData);
564 if (RT_SUCCESS(rc))
565 LogRel((DBGFLOG_NAME ": Successfully wrote guest core dump '%s'\n", pszFilename));
566 else
567 LogRel((DBGFLOG_NAME ": Failed to write guest core dump '%s'. rc=%Rrc\n", pszFilename, rc));
568 return rc;
569}
570
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