DBGFCoreWrite.cpp@ 32534

Last change on this file since 32534 was 32534, checked in by vboxsync, 15 years ago
VMM/DBGFCoreWrite: log.
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1	/* $Id: DBGFCoreWrite.cpp 32534 2010-09-15 17:30:20Z 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	/*
19	* VBox VMCore Format:
20	* [ ELF 64 Header] -- Only 1
21	*
22	* [ PT_NOTE ] -- Only 1
23	* - Offset into CoreDescriptor followed by list of Notes (Note Hdr + data) of VBox CPUs.
24	* - (Any Additional custom Note sections)
25	*
26	* [ PT_LOAD ] -- One for each contiguous memory chunk
27	* - Memory offset
28	* - File offset
29	*
30	* CoreDescriptor
31	* - Magic, VBox version
32	* - Number of CPus
33	*
34	* Per-CPU register dump
35	* - CPU 1 Note Hdr + Data
36	* - CPU 2 Note Hdr + Data
37	* ...
38	* (Additional custom notes Hdr+data)
39	* - VBox 1 Note Hdr + Data
40	* - VBox 2 Note Hdr + Data
41	* ...
42	* Memory dump
43	*
44	*/
45
46	/*******************************************************************************
47	* Header Files *
48	*******************************************************************************/
49	#define LOG_GROUP LOG_GROUP_DBGF
50	#include <iprt/param.h>
51	#include <iprt/file.h>
52
53	#include "DBGFInternal.h"
54
55	#include <VBox/cpum.h>
56	#include "CPUMInternal.h"
57	#include <VBox/dbgf.h>
58	#include <VBox/dbgfcorefmt.h>
59	#include <VBox/vm.h>
60	#include <VBox/pgm.h>
61	#include <VBox/err.h>
62	#include <VBox/log.h>
63	#include <VBox/mm.h>
64	#include <VBox/version.h>
65
66	#include "../Runtime/include/internal/ldrELF64.h"
67
68	/*******************************************************************************
69	* Defined Constants And Macros *
70	*******************************************************************************/
71	#ifdef DEBUG_ramshankar
72	# undef Log
73	# define Log LogRel
74	#endif
75	#define DBGFLOG_NAME "DBGFCoreWrite"
76
77	/*
78	* For now use Solaris-specific padding and namesz length (i.e. includes NULL terminator)
79	*/
80	static const int s_NoteAlign = 4; /* @todo see #5211 comment 3 */
81	static const int s_cbNoteName = 16;
82
83	/* These strings HAVE to be 8-byte aligned */
84	static const char *s_pcszCoreVBoxCore = "VBCORE";
85	static const char *s_pcszCoreVBoxCpu = "VBCPU";
86
87
88	/**
89	* DBGFCOREDATA: Core data.
90	*/
91	typedef struct
92	{
93	const char pszDumpPath; / File path to dump the core into. */
94	} DBGFCOREDATA, *PDBGFCOREDATA;
95
96	/**
97	* ELF function to write 64-bit ELF header.
98	*
99	* @param hFile The file to write to.
100	* @param cProgHdrs Number of program headers.
101	* @param cSecHdrs Number of section headers.
102	* @param pcbElfHdr Where to store the size of written header to file,
103	* can be NULL.
104	*
105	* @return IPRT status code.
106	*/
107	static int Elf64WriteElfHdr(RTFILE hFile, uint16_t cProgHdrs, uint16_t cSecHdrs, uint64_t *pcbElfHdr)
108	{
109	Elf64_Ehdr ElfHdr;
110	RT_ZERO(ElfHdr);
111	ElfHdr.e_ident[EI_MAG0] = ELFMAG0;
112	ElfHdr.e_ident[EI_MAG1] = ELFMAG1;
113	ElfHdr.e_ident[EI_MAG2] = ELFMAG2;
114	ElfHdr.e_ident[EI_MAG3] = ELFMAG3;
115	ElfHdr.e_ident[EI_DATA] = ELFDATA2LSB;
116	ElfHdr.e_type = ET_CORE;
117	ElfHdr.e_version = EV_CURRENT;
118	ElfHdr.e_ident[EI_CLASS] = ELFCLASS64;
119	/* 32-bit VMs will produce cores with e_machine EM_386. */
120	#ifdef RT_ARCH_AMD64
121	ElfHdr.e_machine = EM_X86_64;
122	#else
123	ElfHdr.e_machine = EM_386;
124	#endif
125	ElfHdr.e_phnum = cProgHdrs;
126	ElfHdr.e_shnum = cSecHdrs;
127	ElfHdr.e_ehsize = sizeof(ElfHdr);
128	ElfHdr.e_phoff = sizeof(ElfHdr);
129	ElfHdr.e_phentsize = sizeof(Elf64_Phdr);
130	ElfHdr.e_shentsize = sizeof(Elf64_Shdr);
131
132	int rc = RTFileWrite(hFile, &ElfHdr, sizeof(ElfHdr), NULL /* all */);
133	if (RT_SUCCESS(rc) && pcbElfHdr)
134	*pcbElfHdr = sizeof(ElfHdr);
135	return rc;
136	}
137
138
139	/**
140	* ELF function to write 64-bit program header.
141	*
142	* @param hFile The file to write to.
143	* @param Type Type of program header (PT_*).
144	* @param fFlags Flags (access permissions, PF_*).
145	* @param offFileData File offset of contents.
146	* @param cbFileData Size of contents in the file.
147	* @param cbMemData Size of contents in memory.
148	* @param Phys Physical address, pass zero if not applicable.
149	* @param pcbProgHdr Where to store the size of written header to file,
150	* can be NULL.
151	*
152	* @return IPRT status code.
153	*/
154	static int Elf64WriteProgHdr(RTFILE hFile, uint32_t Type, uint32_t fFlags, uint64_t offFileData, uint64_t cbFileData, uint64_t cbMemData,
155	RTGCPHYS Phys, uint64_t *pcbProgHdr)
156	{
157	Elf64_Phdr ProgHdr;
158	RT_ZERO(ProgHdr);
159	ProgHdr.p_type = Type;
160	ProgHdr.p_flags = fFlags;
161	ProgHdr.p_offset = offFileData;
162	ProgHdr.p_filesz = cbFileData;
163	ProgHdr.p_memsz = cbMemData;
164	ProgHdr.p_paddr = Phys;
165
166	int rc = RTFileWrite(hFile, &ProgHdr, sizeof(ProgHdr), NULL /* all */);
167	if (RT_SUCCESS(rc) && pcbProgHdr)
168	*pcbProgHdr = sizeof(ProgHdr);
169	return rc;
170	}
171
172
173	/**
174	* Returns the size of the NOTE section given the name and size of the data.
175	*
176	* @param pszName Name of the note section.
177	* @param cb Size of the data portion of the note section.
178	*
179	* @return The size of the NOTE section as rounded to the file alignment.
180	*/
181	static inline uint64_t Elf64NoteSectionSize(const char *pszName, uint64_t cbData)
182	{
183	uint64_t cbNote = sizeof(Elf64_Nhdr);
184
185	size_t cbName = strlen(pszName) + 1;
186	size_t cbNameAlign = RT_ALIGN_Z(cbName, s_NoteAlign);
187
188	cbNote += cbNameAlign;
189	cbNote += RT_ALIGN_64(cbData, s_NoteAlign);
190	return cbNote;
191	}
192
193
194	/**
195	* Elf function to write 64-bit note header.
196	*
197	* @param hFile The file to write to.
198	* @param Type Type of this section.
199	* @param pszName Name of this section.
200	* @param pcv Opaque pointer to the data, if NULL only computes size.
201	* @param cbData Size of the data.
202	* @param pcbNoteHdr Where to store the size of written header to file,
203	* can be NULL.
204	*
205	* @return IPRT status code.
206	*/
207	static int Elf64WriteNoteHdr(RTFILE hFile, uint16_t Type, const char pszName, const void pcvData, uint64_t cbData, uint64_t *pcbNoteHdr)
208	{
209	AssertReturn(pcvData, VERR_INVALID_POINTER);
210	AssertReturn(cbData > 0, VERR_NO_DATA);
211
212	char szNoteName[s_cbNoteName];
213	RT_ZERO(szNoteName);
214	RTStrCopy(szNoteName, sizeof(szNoteName), pszName);
215
216	size_t cbName = strlen(szNoteName) + 1;
217	size_t cbNameAlign = RT_ALIGN_Z(cbName, s_NoteAlign);
218	uint64_t cbDataAlign = RT_ALIGN_64(cbData, s_NoteAlign);
219
220	/*
221	* Yell loudly and bail if we are going to be writing a core file that is not compatible with
222	* both Solaris and the 64-bit ELF spec. which dictates 8-byte alignment. See #5211 comment 3.
223	*/
224	if (cbNameAlign % 8)
225	{
226	LogRel((DBGFLOG_NAME ":Elf64WriteNoteHdr pszName=%s cbNameAlign=%u, not 8-byte aligned!\n", pszName, cbNameAlign));
227	return VERR_INVALID_PARAMETER;
228	}
229
230	if (cbDataAlign % 8)
231	{
232	LogRel((DBGFLOG_NAME ":Elf64WriteNoteHdr pszName=%s cbDataAlign=%u, not 8-byte aligned!\n", pszName, cbDataAlign));
233	return VERR_INVALID_PARAMETER;
234	}
235
236	static const char s_achPad[7] = { 0, 0, 0, 0, 0, 0, 0 };
237	AssertCompile(sizeof(s_achPad) >= s_NoteAlign - 1);
238
239	Elf64_Nhdr ElfNoteHdr;
240	RT_ZERO(ElfNoteHdr);
241	ElfNoteHdr.n_namesz = (Elf64_Word)cbName - 1; /* Again a discrepancy between Elf64 and Solaris (#5211 comment 3) */
242	ElfNoteHdr.n_type = Type;
243	ElfNoteHdr.n_descsz = (Elf64_Word)cbDataAlign;
244
245	/*
246	* Write note header.
247	*/
248	int rc = RTFileWrite(hFile, &ElfNoteHdr, sizeof(ElfNoteHdr), NULL /* all */);
249	if (RT_SUCCESS(rc))
250	{
251	/*
252	* Write note name.
253	*/
254	rc = RTFileWrite(hFile, szNoteName, cbName, NULL /* all */);
255	if (RT_SUCCESS(rc))
256	{
257	/*
258	* Write note name padding if required.
259	*/
260	if (cbNameAlign > cbName)
261	rc = RTFileWrite(hFile, s_achPad, cbNameAlign - cbName, NULL);
262
263	if (RT_SUCCESS(rc))
264	{
265	/*
266	* Write note data.
267	*/
268	rc = RTFileWrite(hFile, pcvData, cbData, NULL /* all */);
269	if (RT_SUCCESS(rc))
270	{
271	/*
272	* Write note data padding if required.
273	*/
274	if (cbDataAlign > cbData)
275	rc = RTFileWrite(hFile, s_achPad, cbDataAlign - cbData, NULL /* all*/);
276	}
277	}
278	}
279	}
280
281	if (RT_FAILURE(rc))
282	LogRel((DBGFLOG_NAME ":RTFileWrite failed. rc=%Rrc pszName=%s cbData=%u cbDataAlign=%u\n", rc, pszName, cbData, cbDataAlign));
283
284	return rc;
285	}
286
287
288	/**
289	* Count the number of memory ranges that go into the core file.
290	*
291	* We cannot do a page-by-page dump of the entire guest memory as there will be
292	* way too many program header entries. Also we don't want to dump MMIO regions
293	* which means we cannot have a 1:1 mapping between core file offset and memory
294	* offset. Instead we dump the memory in ranges. A memory range is a contiguous
295	* memory area suitable for dumping to a core file.
296	*
297	* @param pVM The VM handle.
298	*
299	* @return Number of memory ranges
300	*/
301	static uint32_t dbgfR3GetRamRangeCount(PVM pVM)
302	{
303	return PGMR3PhysGetRamRangeCount(pVM);
304	}
305
306
307	/**
308	* EMT Rendezvous worker function for DBGFR3CoreWrite.
309	*
310	* @param pVM The VM handle.
311	* @param pVCpu The handle of the calling VCPU.
312	* @param pvData Opaque data.
313	*
314	* @return VBox status code.
315	*/
316	static DECLCALLBACK(VBOXSTRICTRC) dbgfR3CoreWrite(PVM pVM, PVMCPU pVCpu, void *pvData)
317	{
318	/*
319	* Validate input.
320	*/
321	AssertReturn(pVM, VERR_INVALID_VM_HANDLE);
322	AssertReturn(pVCpu, VERR_INVALID_VMCPU_HANDLE);
323	AssertReturn(pvData, VERR_INVALID_POINTER);
324
325	PDBGFCOREDATA pDbgfData = (PDBGFCOREDATA)pvData;
326
327	/*
328	* Collect core information.
329	*/
330	uint32_t u32MemRanges = dbgfR3GetRamRangeCount(pVM);
331	uint16_t cMemRanges = u32MemRanges < UINT16_MAX - 1 ? u32MemRanges : UINT16_MAX - 1; /* One PT_NOTE Program header */
332	uint16_t cProgHdrs = cMemRanges + 1;
333
334	DBGFCOREDESCRIPTOR CoreDescriptor;
335	RT_ZERO(CoreDescriptor);
336	CoreDescriptor.u32Magic = DBGFCORE_MAGIC;
337	CoreDescriptor.u32FmtVersion = DBGFCORE_FMT_VERSION;
338	CoreDescriptor.cbSelf = sizeof(CoreDescriptor);
339	CoreDescriptor.u32VBoxVersion = VBOX_FULL_VERSION;
340	CoreDescriptor.u32VBoxRevision = VMMGetSvnRev();
341	CoreDescriptor.cCpus = pVM->cCpus;
342
343	Log((DBGFLOG_NAME ":CoreDescriptor Version=%u Revision=%u\n", CoreDescriptor.u32VBoxVersion, CoreDescriptor.u32VBoxRevision));
344
345	/*
346	* Compute total size of the note section.
347	*/
348	uint64_t cbNoteSection = Elf64NoteSectionSize(s_pcszCoreVBoxCore, sizeof(CoreDescriptor))
349	+ pVM->cCpus * Elf64NoteSectionSize(s_pcszCoreVBoxCpu, sizeof(CPUMCTX));
350	uint64_t off = 0;
351
352	/*
353	* Create the core file.
354	*/
355	RTFILE hFile = NIL_RTFILE;
356	int rc = RTFileOpen(&hFile, pDbgfData->pszDumpPath, RTFILE_O_CREATE_REPLACE \| RTFILE_O_READWRITE);
357	if (RT_FAILURE(rc))
358	{
359	LogRel((DBGFLOG_NAME ":RTFileOpen failed for '%s' rc=%Rrc\n", pDbgfData->pszDumpPath, rc));
360	return rc;
361	}
362
363	/*
364	* Write ELF header.
365	*/
366	uint64_t cbElfHdr = 0;
367	uint64_t cbProgHdr = 0;
368	uint64_t offMemRange = 0;
369	rc = Elf64WriteElfHdr(hFile, cProgHdrs, 0 /* cSecHdrs */, &cbElfHdr);
370	off += cbElfHdr;
371	if (RT_FAILURE(rc))
372	{
373	LogRel((DBGFLOG_NAME ":Elf64WriteElfHdr failed. rc=%Rrc\n", rc));
374	goto CoreWriteDone;
375	}
376
377	/*
378	* Write PT_NOTE program header.
379	*/
380	rc = Elf64WriteProgHdr(hFile, PT_NOTE, PF_R,
381	cbElfHdr + cProgHdrs * sizeof(Elf64_Phdr), /* file offset to contents */
382	cbNoteSection, /* size in core file */
383	cbNoteSection, /* size in memory */
384	0, /* physical address */
385	&cbProgHdr);
386	Assert(cbProgHdr == sizeof(Elf64_Phdr));
387	off += cbProgHdr;
388
389	if (RT_FAILURE(rc))
390	{
391	LogRel((DBGFLOG_NAME ":Elf64WritreProgHdr failed for PT_NOTE. rc=%Rrc\n", rc));
392	goto CoreWriteDone;
393	}
394
395	/*
396	* Write PT_LOAD program header for each memory range.
397	*/
398	offMemRange = off + cbNoteSection;
399	for (uint16_t iRange = 0; iRange < cMemRanges; iRange++)
400	{
401	RTGCPHYS GCPhysStart;
402	RTGCPHYS GCPhysEnd;
403
404	bool fIsMmio;
405	rc = PGMR3PhysGetRange(pVM, iRange, &GCPhysStart, &GCPhysEnd, NULL /* pszDesc */, &fIsMmio);
406	if (RT_FAILURE(rc))
407	{
408	LogRel((DBGFLOG_NAME ": PGMR3PhysGetRange failed for iRange(%u) rc=%Rrc\n", iRange, rc));
409	goto CoreWriteDone;
410	}
411
412	uint64_t cbMemRange = GCPhysEnd - GCPhysStart + 1;
413	uint64_t cbFileRange = fIsMmio ? 0 : cbMemRange;
414
415	Log((DBGFLOG_NAME ": PGMR3PhysGetRange iRange=%u GCPhysStart=%#x GCPhysEnd=%#x cbMemRange=%u\n",
416	iRange, GCPhysStart, GCPhysEnd, cbMemRange));
417
418	rc = Elf64WriteProgHdr(hFile, PT_LOAD, PF_R,
419	offMemRange, /* file offset to contents */
420	cbFileRange, /* size in core file */
421	cbMemRange, /* size in memory */
422	GCPhysStart, /* physical address */
423	&cbProgHdr);
424	Assert(cbProgHdr == sizeof(Elf64_Phdr));
425	if (RT_FAILURE(rc))
426	{
427	LogRel((DBGFLOG_NAME ":Elf64WriteProgHdr failed for memory range(%u) cbFileRange=%u cbMemRange=%u rc=%Rrc\n", iRange,
428	cbFileRange, cbMemRange, rc));
429	goto CoreWriteDone;
430	}
431
432	offMemRange += cbFileRange;
433	}
434
435	/*
436	* Write the Core descriptor note header and data.
437	*/
438	rc = Elf64WriteNoteHdr(hFile, NT_VBOXCORE, s_pcszCoreVBoxCore, &CoreDescriptor, sizeof(CoreDescriptor),
439	NULL /* pcbNoteHdr */);
440	if (RT_FAILURE(rc))
441	{
442	LogRel((DBGFLOG_NAME ":Elf64WriteNoteHdr failed for Note '%s' rc=%Rrc\n", s_pcszCoreVBoxCore, rc));
443	goto CoreWriteDone;
444	}
445
446	/*
447	* Write the CPU context note headers and data.
448	*/
449	for (uint32_t iCpu = 0; iCpu < pVM->cCpus; iCpu++)
450	{
451	PCPUMCTX pCpuCtx = &pVM->aCpus[iCpu].cpum.s.Guest;
452	rc = Elf64WriteNoteHdr(hFile, NT_VBOXCPU, s_pcszCoreVBoxCpu, pCpuCtx, sizeof(CPUMCTX), NULL /* pcbNoteHdr */);
453	if (RT_FAILURE(rc))
454	{
455	LogRel((DBGFLOG_NAME ":Elf64WriteNoteHdr failed for vCPU[%u] rc=%Rrc\n", iCpu, rc));
456	goto CoreWriteDone;
457	}
458	}
459
460	/*
461	* Write memory ranges.
462	*/
463	for (uint16_t iRange = 0; iRange < cMemRanges; iRange++)
464	{
465	RTGCPHYS GCPhysStart;
466	RTGCPHYS GCPhysEnd;
467	bool fIsMmio;
468	rc = PGMR3PhysGetRange(pVM, iRange, &GCPhysStart, &GCPhysEnd, NULL /* pszDesc */, &fIsMmio);
469	if (RT_FAILURE(rc))
470	{
471	LogRel((DBGFLOG_NAME ":PGMR3PhysGetRange(2) failed for iRange(%u) rc=%Rrc\n", iRange, rc));
472	goto CoreWriteDone;
473	}
474
475	if (fIsMmio)
476	continue;
477
478	/*
479	* Write page-by-page of this memory range.
480	*/
481	uint64_t cbMemRange = GCPhysEnd - GCPhysStart + 1;
482	uint64_t cPages = cbMemRange >> PAGE_SHIFT;
483	for (uint64_t iPage = 0; iPage < cPages; iPage++)
484	{
485	const int cbBuf = PAGE_SIZE;
486	void *pvBuf = MMR3HeapAlloc(pVM, MM_TAG_DBGF_CORE_WRITE, cbBuf);
487	if (RT_UNLIKELY(!pvBuf))
488	{
489	LogRel((DBGFLOG_NAME ":MMR3HeapAlloc failed. iRange=%u iPage=%u\n", iRange, iPage));
490	goto CoreWriteDone;
491	}
492
493	rc = PGMPhysRead(pVM, GCPhysStart, pvBuf, cbBuf);
494	if (RT_FAILURE(rc))
495	{
496	/*
497	* For some reason this failed, write out a zero page instead.
498	*/
499	LogRel((DBGFLOG_NAME ":PGMPhysRead failed for iRange=%u iPage=%u. rc=%Rrc. Ignoring...\n", iRange,
500	iPage, rc));
501	memset(pvBuf, 0, cbBuf);
502	}
503
504	rc = RTFileWrite(hFile, pvBuf, cbBuf, NULL /* all */);
505	if (RT_FAILURE(rc))
506	{
507	LogRel((DBGFLOG_NAME ":RTFileWrite failed. iRange=%u iPage=%u rc=%Rrc\n", iRange, iPage, rc));
508	MMR3HeapFree(pvBuf);
509	goto CoreWriteDone;
510	}
511
512	MMR3HeapFree(pvBuf);
513	}
514	}
515
516	CoreWriteDone:
517	RTFileClose(hFile);
518
519	return rc;
520	}
521
522
523	/**
524	* Write core dump of the guest.
525	*
526	* @return VBox status code.
527	* @param pVM The VM handle.
528	* @param pszDumpPath The path of the file to dump into, cannot be
529	* NULL.
530	*
531	* @remarks The VM must be suspended before calling this function.
532	*/
533	VMMR3DECL(int) DBGFR3CoreWrite(PVM pVM, const char *pszDumpPath)
534	{
535	VM_ASSERT_VALID_EXT_RETURN(pVM, VERR_INVALID_VM_HANDLE);
536	AssertReturn(pszDumpPath, VERR_INVALID_HANDLE);
537
538	/*
539	* Pass the core write request down to EMT rendezvous which makes sure
540	* other EMTs, if any, are not running. IO threads could still be running
541	* but we don't care about them.
542	*/
543	DBGFCOREDATA CoreData;
544	RT_ZERO(CoreData);
545	CoreData.pszDumpPath = pszDumpPath;
546
547	int rc = VMMR3EmtRendezvous(pVM, VMMEMTRENDEZVOUS_FLAGS_TYPE_ONCE, dbgfR3CoreWrite, &CoreData);
548	if (RT_SUCCESS(rc))
549	LogRel((DBGFLOG_NAME ":Successfully wrote guest core '%s'\n", pszDumpPath));
550	else
551	LogRel((DBGFLOG_NAME ":Failed to write guest core '%s' (%Rrc)\n", pszDumpPath, rc));
552	return rc;
553	}
554

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source: vbox/trunk/src/VBox/VMM/DBGFCoreWrite.cpp@ 32534

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