DBGFCoreWrite.cpp@ 94425

Last change on this file since 94425 was 93554, checked in by vboxsync, 3 years ago
VMM: Changed PAGE_SIZE -> GUEST_PAGE_SIZE / HOST_PAGE_SIZE, PAGE_SHIFT -> GUEST_PAGE_SHIFT / HOST_PAGE_SHIFT, and PAGE_OFFSET_MASK -> GUEST_PAGE_OFFSET_MASK / HOST_PAGE_OFFSET_MASK. Also removed most usage of ASMMemIsZeroPage and ASMMemZeroPage since the host and guest page size doesn't need to be the same any more. Some work left to do in the page pool code. bugref:9898
Property svn:eol-style set to `native` Property svn:keywords set to `Author Date Id Revision`
File size: 24.1 KB

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1	/* $Id: DBGFCoreWrite.cpp 93554 2022-02-02 22:57:02Z vboxsync $ */
2	/** @file
3	* DBGF - Debugger Facility, Guest Core Dump.
4	*/
5
6	/*
7	* Copyright (C) 2010-2022 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	/*********************************************************************************************************************************
49	* Header Files *
50	*********************************************************************************************************************************/
51	#define LOG_GROUP LOG_GROUP_DBGF
52	#include <iprt/param.h>
53	#include <iprt/file.h>
54	#include <iprt/mem.h>
55	#include <iprt/formats/elf64.h>
56
57	#include "DBGFInternal.h"
58
59	#include <VBox/vmm/cpum.h>
60	#include <VBox/vmm/pgm.h>
61	#include <VBox/vmm/apic.h>
62	#include <VBox/vmm/dbgf.h>
63	#include <VBox/vmm/dbgfcorefmt.h>
64	#include <VBox/vmm/mm.h>
65	#include <VBox/vmm/vm.h>
66	#include <VBox/vmm/uvm.h>
67
68	#include <VBox/err.h>
69	#include <VBox/log.h>
70	#include <VBox/version.h>
71
72
73	/*********************************************************************************************************************************
74	* Defined Constants And Macros *
75	*********************************************************************************************************************************/
76	#define DBGFLOG_NAME "DBGFCoreWrite"
77
78
79	/*********************************************************************************************************************************
80	* Global Variables *
81	*********************************************************************************************************************************/
82	static const int g_NoteAlign = 8;
83	static const int g_cbNoteName = 16;
84
85	/* The size of these strings (incl. NULL terminator) must align to 8 bytes (g_NoteAlign) and -not- 4 bytes. */
86	static const char *g_pcszCoreVBoxCore = "VBCORE";
87	static const char *g_pcszCoreVBoxCpu = "VBCPU";
88
89
90	/*********************************************************************************************************************************
91	* Structures and Typedefs *
92	*********************************************************************************************************************************/
93	/**
94	* Guest core writer data.
95	*
96	* Used to pass parameters from DBGFR3CoreWrite to dbgfR3CoreWriteRendezvous().
97	*/
98	typedef struct DBGFCOREDATA
99	{
100	/** The name of the file to write the file to. */
101	const char *pszFilename;
102	/** Whether to replace (/overwrite) any existing file. */
103	bool fReplaceFile;
104	} DBGFCOREDATA;
105	/** Pointer to the guest core writer data. */
106	typedef DBGFCOREDATA *PDBGFCOREDATA;
107
108
109
110	/**
111	* ELF function to write 64-bit ELF header.
112	*
113	* @param hFile The file to write to.
114	* @param cProgHdrs Number of program headers.
115	* @param cSecHdrs Number of section headers.
116	*
117	* @return IPRT status code.
118	*/
119	static int Elf64WriteElfHdr(RTFILE hFile, uint16_t cProgHdrs, uint16_t cSecHdrs)
120	{
121	Elf64_Ehdr ElfHdr;
122	RT_ZERO(ElfHdr);
123	ElfHdr.e_ident[EI_MAG0] = ELFMAG0;
124	ElfHdr.e_ident[EI_MAG1] = ELFMAG1;
125	ElfHdr.e_ident[EI_MAG2] = ELFMAG2;
126	ElfHdr.e_ident[EI_MAG3] = ELFMAG3;
127	ElfHdr.e_ident[EI_DATA] = ELFDATA2LSB;
128	ElfHdr.e_type = ET_CORE;
129	ElfHdr.e_version = EV_CURRENT;
130	ElfHdr.e_ident[EI_CLASS] = ELFCLASS64;
131	/* 32-bit builds will produce cores with e_machine EM_386. */
132	#ifdef RT_ARCH_AMD64
133	ElfHdr.e_machine = EM_X86_64;
134	#else
135	ElfHdr.e_machine = EM_386;
136	#endif
137	ElfHdr.e_phnum = cProgHdrs;
138	ElfHdr.e_shnum = cSecHdrs;
139	ElfHdr.e_ehsize = sizeof(ElfHdr);
140	ElfHdr.e_phoff = sizeof(ElfHdr);
141	ElfHdr.e_phentsize = sizeof(Elf64_Phdr);
142	ElfHdr.e_shentsize = sizeof(Elf64_Shdr);
143
144	return RTFileWrite(hFile, &ElfHdr, sizeof(ElfHdr), NULL /* all */);
145	}
146
147
148	/**
149	* ELF function to write 64-bit program header.
150	*
151	* @param hFile The file to write to.
152	* @param Type Type of program header (PT_*).
153	* @param fFlags Flags (access permissions, PF_*).
154	* @param offFileData File offset of contents.
155	* @param cbFileData Size of contents in the file.
156	* @param cbMemData Size of contents in memory.
157	* @param Phys Physical address, pass zero if not applicable.
158	*
159	* @return IPRT status code.
160	*/
161	static int Elf64WriteProgHdr(RTFILE hFile, uint32_t Type, uint32_t fFlags, uint64_t offFileData, uint64_t cbFileData,
162	uint64_t cbMemData, RTGCPHYS Phys)
163	{
164	Elf64_Phdr ProgHdr;
165	RT_ZERO(ProgHdr);
166	ProgHdr.p_type = Type;
167	ProgHdr.p_flags = fFlags;
168	ProgHdr.p_offset = offFileData;
169	ProgHdr.p_filesz = cbFileData;
170	ProgHdr.p_memsz = cbMemData;
171	ProgHdr.p_paddr = Phys;
172
173	return RTFileWrite(hFile, &ProgHdr, sizeof(ProgHdr), NULL /* all */);
174	}
175
176
177	/**
178	* Returns the size of the NOTE section given the name and size of the data.
179	*
180	* @param pszName Name of the note section.
181	* @param cbData Size of the data portion of the note section.
182	*
183	* @return The size of the NOTE section as rounded to the file alignment.
184	*/
185	static uint64_t Elf64NoteSectionSize(const char *pszName, uint64_t cbData)
186	{
187	uint64_t cbNote = sizeof(Elf64_Nhdr);
188
189	size_t cbName = strlen(pszName) + 1;
190	size_t cbNameAlign = RT_ALIGN_Z(cbName, g_NoteAlign);
191
192	cbNote += cbNameAlign;
193	cbNote += RT_ALIGN_64(cbData, g_NoteAlign);
194	return cbNote;
195	}
196
197
198	/**
199	* Elf function to write 64-bit note header.
200	*
201	* @param hFile The file to write to.
202	* @param Type Type of this section.
203	* @param pszName Name of this section.
204	* @param pvData Opaque pointer to the data, if NULL only computes size.
205	* @param cbData Size of the data.
206	*
207	* @returns IPRT status code.
208	*/
209	static int Elf64WriteNoteHdr(RTFILE hFile, uint16_t Type, const char pszName, const void pvData, uint64_t cbData)
210	{
211	AssertReturn(pvData, VERR_INVALID_POINTER);
212	AssertReturn(cbData > 0, VERR_NO_DATA);
213
214	char szNoteName[g_cbNoteName];
215	RT_ZERO(szNoteName);
216	RTStrCopy(szNoteName, sizeof(szNoteName), pszName);
217
218	size_t cbName = strlen(szNoteName) + 1;
219	size_t cbNameAlign = RT_ALIGN_Z(cbName, g_NoteAlign);
220	uint64_t cbDataAlign = RT_ALIGN_64(cbData, g_NoteAlign);
221
222	/*
223	* Yell loudly and bail if we are going to be writing a core file that is not compatible with
224	* both Solaris and the 64-bit ELF spec. which dictates 8-byte alignment. See @bugref{5211#c3}.
225	*/
226	if (cbNameAlign - cbName > 3)
227	{
228	LogRel((DBGFLOG_NAME ": Elf64WriteNoteHdr pszName=%s cbName=%u cbNameAlign=%u, cbName aligns to 4 not 8-bytes!\n",
229	pszName, cbName, cbNameAlign));
230	return VERR_INVALID_PARAMETER;
231	}
232
233	if (cbDataAlign - cbData > 3)
234	{
235	LogRel((DBGFLOG_NAME ": Elf64WriteNoteHdr pszName=%s cbData=%u cbDataAlign=%u, cbData aligns to 4 not 8-bytes!\n",
236	pszName, cbData, cbDataAlign));
237	return VERR_INVALID_PARAMETER;
238	}
239
240	static const char s_achPad[7] = { 0, 0, 0, 0, 0, 0, 0 };
241	AssertCompile(sizeof(s_achPad) >= g_NoteAlign - 1);
242
243	Elf64_Nhdr ElfNoteHdr;
244	RT_ZERO(ElfNoteHdr);
245	ElfNoteHdr.n_namesz = (Elf64_Word)cbName - 1; /* Again, a discrepancy between ELF-64 and Solaris,
246	we will follow ELF-64, see @bugref{5211#c3}. */
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, cbName, NULL /* all */);
260	if (RT_SUCCESS(rc))
261	{
262	/*
263	* Write note name padding if required.
264	*/
265	if (cbNameAlign > cbName)
266	rc = RTFileWrite(hFile, s_achPad, cbNameAlign - cbName, NULL);
267
268	if (RT_SUCCESS(rc))
269	{
270	/*
271	* Write note data.
272	*/
273	rc = RTFileWrite(hFile, pvData, 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 cbName=%u cbNameAlign=%u cbData=%u cbDataAlign=%u\n",
288	rc, pszName, cbName, cbNameAlign, 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 cross context VM structure.
304	*
305	* @return Number of memory ranges
306	*/
307	static uint32_t dbgfR3GetRamRangeCount(PVM pVM)
308	{
309	return PGMR3PhysGetRamRangeCount(pVM);
310	}
311
312
313	/**
314	* Gets the guest-CPU context suitable for dumping into the core file.
315	*
316	* @param pVCpu The cross context virtual CPU structure.
317	* @param pDbgfCpu Where to dump the guest-CPU data.
318	*/
319	static void dbgfR3GetCoreCpu(PVMCPU pVCpu, PDBGFCORECPU pDbgfCpu)
320	{
321	#define DBGFCOPYSEL(a_dbgfsel, a_cpumselreg) \
322	do { \
323	(a_dbgfsel).uBase = (a_cpumselreg).u64Base; \
324	(a_dbgfsel).uLimit = (a_cpumselreg).u32Limit; \
325	(a_dbgfsel).uAttr = (a_cpumselreg).Attr.u; \
326	(a_dbgfsel).uSel = (a_cpumselreg).Sel; \
327	} while (0)
328
329	PVM pVM = pVCpu->CTX_SUFF(pVM);
330	PCCPUMCTX pCtx = CPUMQueryGuestCtxPtr(pVCpu);
331	pDbgfCpu->rax = pCtx->rax;
332	pDbgfCpu->rbx = pCtx->rbx;
333	pDbgfCpu->rcx = pCtx->rcx;
334	pDbgfCpu->rdx = pCtx->rdx;
335	pDbgfCpu->rsi = pCtx->rsi;
336	pDbgfCpu->rdi = pCtx->rdi;
337	pDbgfCpu->r8 = pCtx->r8;
338	pDbgfCpu->r9 = pCtx->r9;
339	pDbgfCpu->r10 = pCtx->r10;
340	pDbgfCpu->r11 = pCtx->r11;
341	pDbgfCpu->r12 = pCtx->r12;
342	pDbgfCpu->r13 = pCtx->r13;
343	pDbgfCpu->r14 = pCtx->r14;
344	pDbgfCpu->r15 = pCtx->r15;
345	pDbgfCpu->rip = pCtx->rip;
346	pDbgfCpu->rsp = pCtx->rsp;
347	pDbgfCpu->rbp = pCtx->rbp;
348	pDbgfCpu->rflags = pCtx->rflags.u;
349	DBGFCOPYSEL(pDbgfCpu->cs, pCtx->cs);
350	DBGFCOPYSEL(pDbgfCpu->ds, pCtx->ds);
351	DBGFCOPYSEL(pDbgfCpu->es, pCtx->es);
352	DBGFCOPYSEL(pDbgfCpu->fs, pCtx->fs);
353	DBGFCOPYSEL(pDbgfCpu->gs, pCtx->gs);
354	DBGFCOPYSEL(pDbgfCpu->ss, pCtx->ss);
355	pDbgfCpu->cr0 = pCtx->cr0;
356	pDbgfCpu->cr2 = pCtx->cr2;
357	pDbgfCpu->cr3 = pCtx->cr3;
358	pDbgfCpu->cr4 = pCtx->cr4;
359	AssertCompile(RT_ELEMENTS(pDbgfCpu->dr) == RT_ELEMENTS(pCtx->dr));
360	for (unsigned i = 0; i < RT_ELEMENTS(pDbgfCpu->dr); i++)
361	pDbgfCpu->dr[i] = pCtx->dr[i];
362	pDbgfCpu->gdtr.uAddr = pCtx->gdtr.pGdt;
363	pDbgfCpu->gdtr.cb = pCtx->gdtr.cbGdt;
364	pDbgfCpu->idtr.uAddr = pCtx->idtr.pIdt;
365	pDbgfCpu->idtr.cb = pCtx->idtr.cbIdt;
366	DBGFCOPYSEL(pDbgfCpu->ldtr, pCtx->ldtr);
367	DBGFCOPYSEL(pDbgfCpu->tr, pCtx->tr);
368	pDbgfCpu->sysenter.cs = pCtx->SysEnter.cs;
369	pDbgfCpu->sysenter.eip = pCtx->SysEnter.eip;
370	pDbgfCpu->sysenter.esp = pCtx->SysEnter.esp;
371	pDbgfCpu->msrEFER = pCtx->msrEFER;
372	pDbgfCpu->msrSTAR = pCtx->msrSTAR;
373	pDbgfCpu->msrPAT = pCtx->msrPAT;
374	pDbgfCpu->msrLSTAR = pCtx->msrLSTAR;
375	pDbgfCpu->msrCSTAR = pCtx->msrCSTAR;
376	pDbgfCpu->msrSFMASK = pCtx->msrSFMASK;
377	pDbgfCpu->msrKernelGSBase = pCtx->msrKERNELGSBASE;
378	pDbgfCpu->msrApicBase = APICGetBaseMsrNoCheck(pVCpu);
379	pDbgfCpu->msrTscAux = CPUMGetGuestTscAux(pVCpu);
380	pDbgfCpu->aXcr[0] = pCtx->aXcr[0];
381	pDbgfCpu->aXcr[1] = pCtx->aXcr[1];
382	AssertCompile(sizeof(pDbgfCpu->ext) == sizeof(pCtx->XState));
383	pDbgfCpu->cbExt = pVM->cpum.ro.GuestFeatures.cbMaxExtendedState;
384	if (RT_LIKELY(pDbgfCpu->cbExt))
385	memcpy(&pDbgfCpu->ext, &pCtx->XState, pDbgfCpu->cbExt);
386
387	#undef DBGFCOPYSEL
388	}
389
390
391	/**
392	* Worker function for dbgfR3CoreWrite() which does the writing.
393	*
394	* @returns VBox status code
395	* @param pVM The cross context VM structure.
396	* @param hFile The file to write to. Caller closes this.
397	*/
398	static int dbgfR3CoreWriteWorker(PVM pVM, RTFILE hFile)
399	{
400	/*
401	* Collect core information.
402	*/
403	uint32_t const cu32MemRanges = dbgfR3GetRamRangeCount(pVM);
404	uint16_t const cMemRanges = cu32MemRanges < UINT16_MAX - 1 ? cu32MemRanges : UINT16_MAX - 1; /* One PT_NOTE Program header */
405	uint16_t const cProgHdrs = cMemRanges + 1;
406
407	DBGFCOREDESCRIPTOR CoreDescriptor;
408	RT_ZERO(CoreDescriptor);
409	CoreDescriptor.u32Magic = DBGFCORE_MAGIC;
410	CoreDescriptor.u32FmtVersion = DBGFCORE_FMT_VERSION;
411	CoreDescriptor.cbSelf = sizeof(CoreDescriptor);
412	CoreDescriptor.u32VBoxVersion = VBOX_FULL_VERSION;
413	CoreDescriptor.u32VBoxRevision = VMMGetSvnRev();
414	CoreDescriptor.cCpus = pVM->cCpus;
415
416	Log((DBGFLOG_NAME ": CoreDescriptor Version=%u Revision=%u\n", CoreDescriptor.u32VBoxVersion, CoreDescriptor.u32VBoxRevision));
417
418	/*
419	* Compute the file layout (see pg_dbgf_vmcore).
420	*/
421	uint64_t const offElfHdr = RTFileTell(hFile);
422	uint64_t const offNoteSection = offElfHdr + sizeof(Elf64_Ehdr);
423	uint64_t const offLoadSections = offNoteSection + sizeof(Elf64_Phdr);
424	uint64_t const cbLoadSections = cMemRanges * sizeof(Elf64_Phdr);
425	uint64_t const offCoreDescriptor = offLoadSections + cbLoadSections;
426	uint64_t const cbCoreDescriptor = Elf64NoteSectionSize(g_pcszCoreVBoxCore, sizeof(CoreDescriptor));
427	uint64_t const offCpuDumps = offCoreDescriptor + cbCoreDescriptor;
428	uint64_t const cbCpuDumps = pVM->cCpus * Elf64NoteSectionSize(g_pcszCoreVBoxCpu, sizeof(DBGFCORECPU));
429	uint64_t const offMemory = offCpuDumps + cbCpuDumps;
430
431	uint64_t const offNoteSectionData = offCoreDescriptor;
432	uint64_t const cbNoteSectionData = cbCoreDescriptor + cbCpuDumps;
433
434	/*
435	* Write ELF header.
436	*/
437	int rc = Elf64WriteElfHdr(hFile, cProgHdrs, 0 /* cSecHdrs */);
438	if (RT_FAILURE(rc))
439	{
440	LogRel((DBGFLOG_NAME ": Elf64WriteElfHdr failed. rc=%Rrc\n", rc));
441	return rc;
442	}
443
444	/*
445	* Write PT_NOTE program header.
446	*/
447	Assert(RTFileTell(hFile) == offNoteSection);
448	rc = Elf64WriteProgHdr(hFile, PT_NOTE, PF_R,
449	offNoteSectionData, /* file offset to contents */
450	cbNoteSectionData, /* size in core file */
451	cbNoteSectionData, /* size in memory */
452	0); /* physical address */
453	if (RT_FAILURE(rc))
454	{
455	LogRel((DBGFLOG_NAME ": Elf64WritreProgHdr failed for PT_NOTE. rc=%Rrc\n", rc));
456	return rc;
457	}
458
459	/*
460	* Write PT_LOAD program header for each memory range.
461	*/
462	Assert(RTFileTell(hFile) == offLoadSections);
463	uint64_t offMemRange = offMemory;
464	for (uint16_t iRange = 0; iRange < cMemRanges; iRange++)
465	{
466	RTGCPHYS GCPhysStart;
467	RTGCPHYS GCPhysEnd;
468	bool fIsMmio;
469	rc = PGMR3PhysGetRange(pVM, iRange, &GCPhysStart, &GCPhysEnd, NULL /* pszDesc */, &fIsMmio);
470	if (RT_FAILURE(rc))
471	{
472	LogRel((DBGFLOG_NAME ": PGMR3PhysGetRange failed for iRange(%u) rc=%Rrc\n", iRange, rc));
473	return rc;
474	}
475
476	uint64_t cbMemRange = GCPhysEnd - GCPhysStart + 1;
477	uint64_t cbFileRange = fIsMmio ? 0 : cbMemRange;
478
479	Log((DBGFLOG_NAME ": PGMR3PhysGetRange iRange=%u GCPhysStart=%#x GCPhysEnd=%#x cbMemRange=%u\n",
480	iRange, GCPhysStart, GCPhysEnd, cbMemRange));
481
482	rc = Elf64WriteProgHdr(hFile, PT_LOAD, PF_R,
483	offMemRange, /* file offset to contents */
484	cbFileRange, /* size in core file */
485	cbMemRange, /* size in memory */
486	GCPhysStart); /* physical address */
487	if (RT_FAILURE(rc))
488	{
489	LogRel((DBGFLOG_NAME ": Elf64WriteProgHdr failed for memory range(%u) cbFileRange=%u cbMemRange=%u rc=%Rrc\n",
490	iRange, cbFileRange, cbMemRange, rc));
491	return rc;
492	}
493
494	offMemRange += cbFileRange;
495	}
496
497	/*
498	* Write the Core descriptor note header and data.
499	*/
500	Assert(RTFileTell(hFile) == offCoreDescriptor);
501	rc = Elf64WriteNoteHdr(hFile, NT_VBOXCORE, g_pcszCoreVBoxCore, &CoreDescriptor, sizeof(CoreDescriptor));
502	if (RT_FAILURE(rc))
503	{
504	LogRel((DBGFLOG_NAME ": Elf64WriteNoteHdr failed for Note '%s' rc=%Rrc\n", g_pcszCoreVBoxCore, rc));
505	return rc;
506	}
507
508	/*
509	* Write the CPU context note headers and data.
510	* We allocate the DBGFCORECPU struct. rather than using the stack as it can be pretty large due to X86XSAVEAREA.
511	*/
512	Assert(RTFileTell(hFile) == offCpuDumps);
513	PDBGFCORECPU pDbgfCoreCpu = (PDBGFCORECPU)RTMemAlloc(sizeof(*pDbgfCoreCpu));
514	if (RT_UNLIKELY(!pDbgfCoreCpu))
515	{
516	LogRel((DBGFLOG_NAME ": Failed to alloc %u bytes for DBGFCORECPU\n", sizeof(*pDbgfCoreCpu)));
517	return VERR_NO_MEMORY;
518	}
519
520	for (VMCPUID idCpu = 0; idCpu < pVM->cCpus; idCpu++)
521	{
522	PVMCPU pVCpu = pVM->apCpusR3[idCpu];
523	RT_BZERO(pDbgfCoreCpu, sizeof(*pDbgfCoreCpu));
524	dbgfR3GetCoreCpu(pVCpu, pDbgfCoreCpu);
525
526	rc = Elf64WriteNoteHdr(hFile, NT_VBOXCPU, g_pcszCoreVBoxCpu, pDbgfCoreCpu, sizeof(*pDbgfCoreCpu));
527	if (RT_FAILURE(rc))
528	{
529	LogRel((DBGFLOG_NAME ": Elf64WriteNoteHdr failed for vCPU[%u] rc=%Rrc\n", idCpu, rc));
530	RTMemFree(pDbgfCoreCpu);
531	return rc;
532	}
533	}
534	RTMemFree(pDbgfCoreCpu);
535	pDbgfCoreCpu = NULL;
536
537	/*
538	* Write memory ranges.
539	*/
540	Assert(RTFileTell(hFile) == offMemory);
541	for (uint16_t iRange = 0; iRange < cMemRanges; iRange++)
542	{
543	RTGCPHYS GCPhysStart;
544	RTGCPHYS GCPhysEnd;
545	bool fIsMmio;
546	rc = PGMR3PhysGetRange(pVM, iRange, &GCPhysStart, &GCPhysEnd, NULL /* pszDesc */, &fIsMmio);
547	if (RT_FAILURE(rc))
548	{
549	LogRel((DBGFLOG_NAME ": PGMR3PhysGetRange(2) failed for iRange(%u) rc=%Rrc\n", iRange, rc));
550	return rc;
551	}
552
553	if (fIsMmio)
554	continue;
555
556	/*
557	* Write page-by-page of this memory range.
558	*
559	* The read function may fail on MMIO ranges, we write these as zero
560	* pages for now (would be nice to have the VGA bits there though).
561	*/
562	uint64_t cbMemRange = GCPhysEnd - GCPhysStart + 1;
563	uint64_t cPages = cbMemRange >> GUEST_PAGE_SHIFT;
564	for (uint64_t iPage = 0; iPage < cPages; iPage++)
565	{
566	uint8_t abPage[GUEST_PAGE_SIZE];
567	rc = PGMPhysSimpleReadGCPhys(pVM, abPage, GCPhysStart + (iPage << GUEST_PAGE_SHIFT), sizeof(abPage));
568	if (RT_FAILURE(rc))
569	{
570	if (rc != VERR_PGM_PHYS_PAGE_RESERVED)
571	LogRel((DBGFLOG_NAME ": PGMPhysRead failed for iRange=%u iPage=%u. rc=%Rrc. Ignoring...\n", iRange, iPage, rc));
572	RT_ZERO(abPage);
573	}
574
575	rc = RTFileWrite(hFile, abPage, sizeof(abPage), NULL /* all */);
576	if (RT_FAILURE(rc))
577	{
578	LogRel((DBGFLOG_NAME ": RTFileWrite failed. iRange=%u iPage=%u rc=%Rrc\n", iRange, iPage, rc));
579	return rc;
580	}
581	}
582	}
583
584	return rc;
585	}
586
587
588	/**
589	* EMT Rendezvous worker function for DBGFR3CoreWrite().
590	*
591	* @param pVM The cross context VM structure.
592	* @param pVCpu The cross context virtual CPU structure of the calling EMT.
593	* @param pvData Opaque data.
594	*
595	* @return VBox status code.
596	*/
597	static DECLCALLBACK(VBOXSTRICTRC) dbgfR3CoreWriteRendezvous(PVM pVM, PVMCPU pVCpu, void *pvData)
598	{
599	/*
600	* Validate input.
601	*/
602	AssertReturn(pVM, VERR_INVALID_VM_HANDLE);
603	AssertReturn(pVCpu, VERR_INVALID_VMCPU_HANDLE);
604	AssertReturn(pvData, VERR_INVALID_POINTER);
605
606	PDBGFCOREDATA pDbgfData = (PDBGFCOREDATA)pvData;
607
608	/*
609	* Create the core file.
610	*/
611	uint32_t fFlags = (pDbgfData->fReplaceFile ? RTFILE_O_CREATE_REPLACE : RTFILE_O_CREATE)
612	\| RTFILE_O_WRITE
613	\| RTFILE_O_DENY_ALL
614	\| (0600 << RTFILE_O_CREATE_MODE_SHIFT);
615	RTFILE hFile;
616	int rc = RTFileOpen(&hFile, pDbgfData->pszFilename, fFlags);
617	if (RT_SUCCESS(rc))
618	{
619	rc = dbgfR3CoreWriteWorker(pVM, hFile);
620	RTFileClose(hFile);
621	}
622	else
623	LogRel((DBGFLOG_NAME ": RTFileOpen failed for '%s' rc=%Rrc\n", pDbgfData->pszFilename, rc));
624	return rc;
625	}
626
627
628	/**
629	* Write core dump of the guest.
630	*
631	* @returns VBox status code.
632	* @param pUVM The user mode VM handle.
633	* @param pszFilename The name of the file to which the guest core
634	* dump should be written.
635	* @param fReplaceFile Whether to replace the file or not.
636	*
637	* @remarks The VM may need to be suspended before calling this function in
638	* order to truly stop all device threads and drivers. This function
639	* only synchronizes EMTs.
640	*/
641	VMMR3DECL(int) DBGFR3CoreWrite(PUVM pUVM, const char *pszFilename, bool fReplaceFile)
642	{
643	UVM_ASSERT_VALID_EXT_RETURN(pUVM, VERR_INVALID_VM_HANDLE);
644	PVM pVM = pUVM->pVM;
645	VM_ASSERT_VALID_EXT_RETURN(pVM, VERR_INVALID_VM_HANDLE);
646	AssertReturn(pszFilename, VERR_INVALID_HANDLE);
647
648	/*
649	* Pass the core write request down to EMT rendezvous which makes sure
650	* other EMTs, if any, are not running. IO threads could still be running
651	* but we don't care about them.
652	*/
653	DBGFCOREDATA CoreData;
654	RT_ZERO(CoreData);
655	CoreData.pszFilename = pszFilename;
656	CoreData.fReplaceFile = fReplaceFile;
657
658	int rc = VMMR3EmtRendezvous(pVM, VMMEMTRENDEZVOUS_FLAGS_TYPE_ONCE, dbgfR3CoreWriteRendezvous, &CoreData);
659	if (RT_SUCCESS(rc))
660	LogRel((DBGFLOG_NAME ": Successfully wrote guest core dump '%s'\n", pszFilename));
661	else
662	LogRel((DBGFLOG_NAME ": Failed to write guest core dump '%s'. rc=%Rrc\n", pszFilename, rc));
663	return rc;
664	}
665

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source: vbox/trunk/src/VBox/VMM/VMMR3/DBGFCoreWrite.cpp@ 94425

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