dbgstackdumpself.cpp@ 84204

Last change on this file since 84204 was 82968, checked in by vboxsync, 5 years ago
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1	/* $Id: dbgstackdumpself.cpp 82968 2020-02-04 10:35:17Z vboxsync $ */
2	/** @file
3	* IPRT - Dump current thread stack to buffer.
4	*/
5
6	/*
7	* Copyright (C) 2006-2020 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	* The contents of this file may alternatively be used under the terms
18	* of the Common Development and Distribution License Version 1.0
19	* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
20	* VirtualBox OSE distribution, in which case the provisions of the
21	* CDDL are applicable instead of those of the GPL.
22	*
23	* You may elect to license modified versions of this file under the
24	* terms and conditions of either the GPL or the CDDL or both.
25	*/
26
27
28	/*********************************************************************************************************************************
29	* Header Files *
30	*********************************************************************************************************************************/
31	#include "internal/iprt.h"
32	#include <iprt/dbg.h>
33
34	#include <iprt/errcore.h>
35	#include <iprt/string.h>
36	#include <iprt/ldr.h>
37	#include <iprt/list.h>
38	#include <iprt/mem.h>
39	#include <iprt/path.h>
40	#include <iprt/string.h>
41
42	#if defined(RT_ARCH_AMD64) \|\| defined(RT_ARCH_X86)
43	# include <iprt/x86.h>
44	#else
45	# error "PORTME"
46	#endif
47
48	#ifdef RT_OS_WINDOWS
49	# include <iprt/param.h>
50	# include <iprt/utf16.h>
51	# include <iprt/win/windows.h>
52	#elif defined(RT_OS_LINUX) \|\| defined(RT_OS_DARWIN)
53	# include <dlfcn.h>
54	#endif
55
56
57	/*********************************************************************************************************************************
58	* Structures and Typedefs *
59	*********************************************************************************************************************************/
60	/**
61	* Cached module.
62	*/
63	typedef struct RTDBGSTACKSELFMOD
64	{
65	/** List entry. */
66	RTLISTNODE ListEntry;
67	/** The mapping address. */
68	uintptr_t uMapping;
69	/** The size of the mapping. */
70	size_t cbMapping;
71	/** The loader module handle. */
72	RTLDRMOD hLdrMod;
73	/** The debug module handle, if available. */
74	RTDBGMOD hDbgMod;
75	/** Offset into szFilename of the name part. */
76	size_t offName;
77	/** the module filename. */
78	char szFilename[RTPATH_MAX];
79	} RTDBGSTACKSELFMOD;
80	/** Pointer to a cached module. */
81	typedef RTDBGSTACKSELFMOD *PRTDBGSTACKSELFMOD;
82
83
84	/**
85	* Symbol search state.
86	*/
87	typedef struct RTDBGSTACKSELFSYMSEARCH
88	{
89	/** The address (not RVA) we're searching for a symbol for. */
90	uintptr_t uSearch;
91	/** The distance of the current hit. This is ~(uintptr_t)0 if no hit. */
92	uintptr_t offBestDist;
93	/** Where to return symbol information. */
94	PRTDBGSYMBOL pSymInfo;
95	} RTDBGSTACKSELFSYMSEARCH;
96	typedef RTDBGSTACKSELFSYMSEARCH *PRTDBGSTACKSELFSYMSEARCH;
97
98
99	/*********************************************************************************************************************************
100	* Internal Functions *
101	*********************************************************************************************************************************/
102	/* Wanted to use DECLHIDDEN(DECLASM(size_t)) here, but early solaris 11 doesn't like it. */
103	RT_C_DECLS_BEGIN
104	DECLHIDDEN(DECLCALLBACK(size_t)) rtDbgStackDumpSelfWorker(char *pszStack, size_t cbStack, uint32_t fFlags, PCRTCCUINTREG pauRegs);
105	RT_C_DECLS_END
106
107
108	/**
109	* Worker for stack and module reader callback.
110	*
111	* @returns IPRT status code
112	* @param pvDst Where to put the request memory.
113	* @param cbToRead How much to read.
114	* @param uSrcAddr Where to read the memory from.
115	*/
116	static int rtDbgStackDumpSelfSafeMemoryReader(void *pvDst, size_t cbToRead, uintptr_t uSrcAddr)
117	{
118	# ifdef RT_OS_WINDOWS
119	# if 1
120	__try
121	{
122	memcpy(pvDst, (void const *)uSrcAddr, cbToRead);
123	}
124	__except(EXCEPTION_EXECUTE_HANDLER)
125	{
126	return VERR_ACCESS_DENIED;
127	}
128	# else
129	SIZE_T cbActual = 0;
130	if (ReadProcessMemory(GetCurrentProcess(), (void const *)uSrcAddr, pvDst, cbToRead, &cbActual))
131	{
132	if (cbActual >= cbToRead)
133	return VINF_SUCCESS;
134	memset((uint8_t *)pvDst + cbActual, 0, cbToRead - cbActual);
135	return VINF_SUCCESS;
136	}
137	# endif
138	# else
139	/** @todo secure this from SIGSEGV. */
140	memcpy(pvDst, (void const *)uSrcAddr, cbToRead);
141	# endif
142	return VINF_SUCCESS;
143	}
144
145
146	#if defined(RT_OS_WINDOWS) && 0
147	/**
148	* @callback_method_impl{FNRTLDRRDRMEMREAD}
149	*/
150	static DECLCALLBACK(int) rtDbgStackDumpSelfModReader(void pvBuf, size_t cb, size_t off, void pvUser)
151	{
152	PRTDBGSTACKSELFMOD pMod = (PRTDBGSTACKSELFMOD)pvUser;
153	return rtDbgStackDumpSelfSafeMemoryReader(pvBuf, cb, pMod->uMapping + off);
154	}
155	#endif
156
157
158	/**
159	* @interface_method_impl{RTDBGUNWINDSTATE,pfnReadStack}
160	*/
161	static DECLCALLBACK(int) rtDbgStackDumpSelfReader(PRTDBGUNWINDSTATE pThis, RTUINTPTR uSp, size_t cbToRead, void *pvDst)
162	{
163	RT_NOREF(pThis);
164	return rtDbgStackDumpSelfSafeMemoryReader(pvDst, cbToRead, uSp);
165	}
166
167
168	#ifdef RT_OS_WINDOWS
169	/**
170	* Figure the size of a loaded PE image.
171	* @returns The size.
172	* @param uBase The image base address.
173	*/
174	static size_t rtDbgStackDumpSelfGetPeImageSize(uintptr_t uBase)
175	{
176	union
177	{
178	IMAGE_DOS_HEADER DosHdr;
179	IMAGE_NT_HEADERS NtHdrs;
180	} uBuf;
181	int rc = rtDbgStackDumpSelfSafeMemoryReader(&uBuf, sizeof(uBuf.DosHdr), uBase);
182	if (RT_SUCCESS(rc))
183	{
184	if ( uBuf.DosHdr.e_magic == IMAGE_DOS_SIGNATURE
185	&& uBuf.DosHdr.e_lfanew < _2M)
186	{
187	rc = rtDbgStackDumpSelfSafeMemoryReader(&uBuf, sizeof(uBuf.NtHdrs), uBase + uBuf.DosHdr.e_lfanew);
188	if (RT_SUCCESS(rc))
189	{
190	if (uBuf.NtHdrs.Signature == IMAGE_NT_SIGNATURE)
191	return uBuf.NtHdrs.OptionalHeader.SizeOfImage;
192	}
193	}
194	}
195	return _64K;
196	}
197	#endif
198
199
200	/**
201	* Works the module cache.
202	*
203	* @returns Pointer to module cache entry on success, NULL otherwise.
204	* @param uPc The PC to locate a module for.
205	* @param pCachedModules The module cache.
206	*/
207	static PRTDBGSTACKSELFMOD rtDbgStackDumpSelfQueryModForPC(uintptr_t uPc, PRTLISTANCHOR pCachedModules)
208	{
209	/*
210	* Search the list first.
211	*/
212	PRTDBGSTACKSELFMOD pMod;
213	RTListForEach(pCachedModules, pMod, RTDBGSTACKSELFMOD, ListEntry)
214	{
215	if (uPc - pMod->uMapping < pMod->cbMapping)
216	return pMod;
217	}
218
219	/*
220	* Try figure out the module using the native loader or similar.
221	*/
222	#ifdef RT_OS_WINDOWS
223	HMODULE hmod = NULL;
224	static bool volatile s_fResolvedSymbols = false;
225	static decltype(GetModuleHandleExW) *g_pfnGetModuleHandleExW = NULL;
226	decltype(GetModuleHandleExW) *pfnGetModuleHandleExW;
227	if (s_fResolvedSymbols)
228	pfnGetModuleHandleExW = g_pfnGetModuleHandleExW;
229	else
230	{
231	pfnGetModuleHandleExW = (decltype(GetModuleHandleExW) *)GetProcAddress(GetModuleHandleW(L"kernel32.dll"),
232	"GetModuleHandleExW");
233	g_pfnGetModuleHandleExW = pfnGetModuleHandleExW;
234	s_fResolvedSymbols = true;
235	}
236	if ( pfnGetModuleHandleExW
237	&& pfnGetModuleHandleExW(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS \| GET_MODULE_HANDLE_EX_FLAG_UNCHANGED_REFCOUNT,
238	(LPCWSTR)uPc, &hmod))
239	{
240	WCHAR wszFilename[RTPATH_MAX];
241	DWORD cwcFilename = GetModuleFileNameW(hmod, wszFilename, RT_ELEMENTS(wszFilename));
242	if (cwcFilename > 0)
243	{
244	pMod = (PRTDBGSTACKSELFMOD)RTMemAllocZ(sizeof(*pMod));
245	if (pMod)
246	{
247	char *pszDst = pMod->szFilename;
248	int rc = RTUtf16ToUtf8Ex(wszFilename, cwcFilename, &pszDst, sizeof(pMod->szFilename), NULL);
249	if (RT_SUCCESS(rc))
250	{
251	const char *pszFilename = RTPathFilename(pMod->szFilename);
252	pMod->offName = pszFilename ? pszFilename - &pMod->szFilename[0] : 0;
253	pMod->uMapping = (uintptr_t)hmod & ~(uintptr_t)(PAGE_SIZE - 1);
254	pMod->cbMapping = rtDbgStackDumpSelfGetPeImageSize(pMod->uMapping);
255	pMod->hLdrMod = NIL_RTLDRMOD;
256	pMod->hDbgMod = NIL_RTDBGMOD;
257
258	# if 0 /* this ain't reliable, trouble enumerate symbols in VBoxRT. But why bother when we can load it off the disk. */
259	rc = RTLdrOpenInMemory(&pMod->szFilename[pMod->offName], RTLDR_O_FOR_DEBUG, RTLdrGetHostArch(),
260	pMod->cbMapping, rtDbgStackDumpSelfModReader, NULL /pfnDtor/, pMod /pvUser/,
261	&pMod->hLdrMod, NULL /pErrInfo/);
262	# else
263	rc = RTLdrOpen(pMod->szFilename, RTLDR_O_FOR_DEBUG, RTLdrGetHostArch(), &pMod->hLdrMod);
264	# endif
265	if (RT_SUCCESS(rc))
266	{
267	pMod->cbMapping = RTLdrSize(pMod->hLdrMod);
268
269	/* Try open debug info for the module. */
270	uint32_t uTimeDateStamp = 0;
271	RTLdrQueryProp(pMod->hLdrMod, RTLDRPROP_TIMESTAMP_SECONDS, &uTimeDateStamp, sizeof(uTimeDateStamp));
272	rc = RTDbgModCreateFromPeImage(&pMod->hDbgMod, pMod->szFilename, &pMod->szFilename[pMod->offName],
273	&pMod->hLdrMod, (uint32_t)pMod->cbMapping, uTimeDateStamp, NIL_RTDBGCFG);
274	RTListPrepend(pCachedModules, &pMod->ListEntry);
275	return pMod;
276	}
277	}
278	RTMemFree(pMod);
279	}
280	}
281	}
282	#elif defined(RT_OS_LINUX) \|\| defined(RT_OS_DARWIN)
283	Dl_info Info = { NULL, NULL, NULL, NULL };
284	int rc = dladdr((const void *)uPc, &Info);
285	if (rc != 0 && Info.dli_fname)
286	{
287	pMod = (PRTDBGSTACKSELFMOD)RTMemAllocZ(sizeof(*pMod));
288	if (pMod)
289	{
290	/** @todo better filename translation... */
291	rc = RTStrCopy(pMod->szFilename, sizeof(pMod->szFilename), Info.dli_fname);
292	if (RT_SUCCESS(rc))
293	{
294	RTStrPurgeEncoding(pMod->szFilename);
295
296	const char *pszFilename = RTPathFilename(pMod->szFilename);
297	pMod->offName = pszFilename ? pszFilename - &pMod->szFilename[0] : 0;
298	pMod->uMapping = (uintptr_t)Info.dli_fbase;
299	pMod->cbMapping = 0;
300	pMod->hLdrMod = NIL_RTLDRMOD;
301	pMod->hDbgMod = NIL_RTDBGMOD;
302
303	rc = RTLdrOpen(pMod->szFilename, RTLDR_O_FOR_DEBUG, RTLdrGetHostArch(), &pMod->hLdrMod);
304	if (RT_SUCCESS(rc))
305	{
306	pMod->cbMapping = RTLdrSize(pMod->hLdrMod);
307
308	/* Try open debug info for the module. */
309	//uint32_t uTimeDateStamp = 0;
310	//RTLdrQueryProp(pMod->hLdrMod, RTLDRPROP_TIMESTAMP_SECONDS, &uTimeDateStamp, sizeof(uTimeDateStamp));
311	//RTDbgModCreateFromImage()??
312	//rc = RTDbgModCreateFromPeImage(&pMod->hDbgMod, pMod->szFilename, &pMod->szFilename[pMod->offName],
313	// &pMod->hLdrMod, (uint32_t)pMod->cbMapping, uTimeDateStamp, NIL_RTDBGCFG);
314
315	RTListPrepend(pCachedModules, &pMod->ListEntry);
316	return pMod;
317	}
318	}
319	RTMemFree(pMod);
320	}
321	}
322	#endif
323	return NULL;
324	}
325
326
327	/**
328	* @callback_method_impl{FNRTLDRENUMSYMS}
329	*/
330	static DECLCALLBACK(int) rtDbgStackdumpSelfSymbolSearchCallback(RTLDRMOD hLdrMod, const char *pszSymbol,
331	unsigned uSymbol, RTLDRADDR Value, void *pvUser)
332	{
333	PRTDBGSTACKSELFSYMSEARCH pSearch = (PRTDBGSTACKSELFSYMSEARCH)pvUser;
334	if (Value >= pSearch->uSearch)
335	{
336	uintptr_t const offDist = (uintptr_t)Value - pSearch->uSearch;
337	if (offDist < pSearch->offBestDist)
338	{
339	pSearch->offBestDist = offDist;
340
341	PRTDBGSYMBOL pSymInfo = pSearch->pSymInfo;
342	pSymInfo->Value = Value;
343	pSymInfo->offSeg = Value;
344	pSymInfo->iSeg = RTDBGSEGIDX_ABS;
345	pSymInfo->iOrdinal = uSymbol;
346	pSymInfo->fFlags = 0;
347	if (pszSymbol)
348	RTStrCopy(pSymInfo->szName, sizeof(pSymInfo->szName), pszSymbol);
349	else
350	RTStrPrintf(pSymInfo->szName, sizeof(pSymInfo->szName), "Ordinal#%u", uSymbol);
351
352	if (offDist < 8)
353	return VINF_CALLBACK_RETURN;
354	}
355	}
356	RT_NOREF(hLdrMod);
357	return VINF_SUCCESS;
358	}
359
360
361	/**
362	* Searches for a symbol close to @a uRva.
363	*
364	* @returns true if found, false if not.
365	* @param pMod The module cache entry to search in.
366	* @param uRva The RVA to locate a symbol for.
367	* @param poffDisp Where to return the distance between uRva and the returned symbol.
368	* @param pSymInfo Where to return the symbol information.
369	*/
370	static bool rtDbgStackDumpSelfQuerySymbol(PRTDBGSTACKSELFMOD pMod, uintptr_t uRva, PRTINTPTR poffDisp, PRTDBGSYMBOL pSymInfo)
371	{
372	if (pMod->hDbgMod != NIL_RTDBGMOD)
373	{
374	int rc = RTDbgModSymbolByAddr(pMod->hDbgMod, RTDBGSEGIDX_RVA, uRva, RTDBGSYMADDR_FLAGS_LESS_OR_EQUAL,
375	poffDisp, pSymInfo);
376	if (RT_SUCCESS(rc))
377	return true;
378	}
379
380	if (pMod->hLdrMod != NIL_RTLDRMOD)
381	{
382	RTDBGSTACKSELFSYMSEARCH SearchInfo = { pMod->uMapping + uRva, ~(uintptr_t)0, pSymInfo };
383	int rc = RTLdrEnumSymbols(pMod->hLdrMod, 0, (const void *)pMod->uMapping, pMod->uMapping,
384	rtDbgStackdumpSelfSymbolSearchCallback, &SearchInfo);
385	if (RT_SUCCESS(rc) && SearchInfo.offBestDist != ~(uintptr_t)0)
386	{
387	*poffDisp = SearchInfo.offBestDist;
388	return true;
389	}
390	}
391
392	return false;
393	}
394
395
396	/**
397	* Does the grunt work for RTDbgStackDumpSelf.
398	*
399	* Called thru an assembly wrapper that collects the necessary register state.
400	*
401	* @returns Length of the string returned in pszStack.
402	* @param pszStack Where to output the stack dump.
403	* @param cbStack The size of the @a pszStack buffer.
404	* @param fFlags Flags, MBZ.
405	* @param pauRegs Register state. For AMD64 and x86 this starts with the
406	* PC and us followed by the general purpose registers.
407	*/
408	DECLHIDDEN(DECLCALLBACK(size_t)) rtDbgStackDumpSelfWorker(char *pszStack, size_t cbStack, uint32_t fFlags, PCRTCCUINTREG pauRegs)
409	{
410	RT_NOREF(fFlags);
411
412	/*
413	* Initialize the unwind state.
414	*/
415	RTDBGUNWINDSTATE UnwindState;
416	RT_ZERO(UnwindState);
417
418	UnwindState.u32Magic = RTDBGUNWINDSTATE_MAGIC;
419	UnwindState.pfnReadStack = rtDbgStackDumpSelfReader;
420	#ifdef RT_ARCH_AMD64
421	UnwindState.enmArch = RTLDRARCH_AMD64;
422	UnwindState.uPc = pauRegs[0];
423	UnwindState.enmRetType = RTDBGRETURNTYPE_NEAR64;
424	for (unsigned i = 0; i < 16; i++)
425	UnwindState.u.x86.auRegs[i] = pauRegs[i + 1];
426	#elif defined(RT_ARCH_X86)
427	UnwindState.enmArch = RTLDRARCH_X86_32;
428	UnwindState.uPc = pauRegs[0];
429	UnwindState.enmRetType = RTDBGRETURNTYPE_NEAR32;
430	for (unsigned i = 0; i < 8; i++)
431	UnwindState.u.x86.auRegs[i] = pauRegs[i + 1];
432	#else
433	# error "PORTME"
434	#endif
435
436	/*
437	* We cache modules.
438	*/
439	PRTDBGSTACKSELFMOD pCurModule = NULL;
440	RTLISTANCHOR CachedModules;
441	RTListInit(&CachedModules);
442
443	/*
444	* Work the stack.
445	*/
446	size_t offDst = 0;
447	while (offDst + 64 < cbStack)
448	{
449	/* Try locate the module containing the current PC. */
450	if ( !pCurModule
451	\|\| UnwindState.uPc - pCurModule->uMapping >= pCurModule->cbMapping)
452	pCurModule = rtDbgStackDumpSelfQueryModForPC(UnwindState.uPc, &CachedModules);
453	bool fManualUnwind = true;
454	if (!pCurModule)
455	offDst += RTStrPrintf(&pszStack[offDst], cbStack - offDst, "%p\n", UnwindState.uPc);
456	else
457	{
458	uintptr_t const uRva = UnwindState.uPc - pCurModule->uMapping;
459
460	/*
461	* Add a call stack entry with the symbol if we can.
462	*/
463	union
464	{
465	RTDBGSYMBOL SymbolInfo;
466	RTDBGLINE LineInfo;
467	} uBuf;
468	RTINTPTR offDisp = 0;
469	if (!rtDbgStackDumpSelfQuerySymbol(pCurModule, uRva, &offDisp, &uBuf.SymbolInfo))
470	offDst += RTStrPrintf(&pszStack[offDst], cbStack - offDst, "%p %s + %#zx\n",
471	UnwindState.uPc, &pCurModule->szFilename[pCurModule->offName], (size_t)uRva);
472	else if (offDisp == 0)
473	offDst += RTStrPrintf(&pszStack[offDst], cbStack - offDst, "%p %s!%s (rva:%#zx)\n", UnwindState.uPc,
474	&pCurModule->szFilename[pCurModule->offName], uBuf.SymbolInfo.szName, (size_t)uRva);
475	else
476	offDst += RTStrPrintf(&pszStack[offDst], cbStack - offDst, "%p %s!%s%c%#zx (rva:%#zx)\n",
477	UnwindState.uPc, &pCurModule->szFilename[pCurModule->offName], uBuf.SymbolInfo.szName,
478	offDisp >= 0 ? '+' : '-', (size_t)RT_ABS(offDisp), (size_t)uRva);
479
480	/*
481	* Try supply the line number.
482	*/
483	if (pCurModule->hDbgMod != NIL_RTDBGMOD)
484	{
485	offDisp = 0;
486	int rc = RTDbgModLineByAddr(pCurModule->hDbgMod, RTDBGSEGIDX_RVA, uRva, &offDisp, &uBuf.LineInfo);
487	if (RT_SUCCESS(rc) && offDisp)
488	offDst += RTStrPrintf(&pszStack[offDst], cbStack - offDst, " [%s:%u]\n",
489	uBuf.LineInfo.szFilename, uBuf.LineInfo.uLineNo);
490	else if (RT_SUCCESS(rc))
491	offDst += RTStrPrintf(&pszStack[offDst], cbStack - offDst, " [%s:%u (%c%#zx)]\n", uBuf.LineInfo.szFilename,
492	uBuf.LineInfo.uLineNo, offDisp >= 0 ? '+' : '-', (size_t)RT_ABS(offDisp));
493	}
494
495	/*
496	* Try unwind using the module info.
497	*/
498	int rc;
499	if (pCurModule->hDbgMod != NIL_RTDBGMOD)
500	rc = RTDbgModUnwindFrame(pCurModule->hDbgMod, RTDBGSEGIDX_RVA, uRva, &UnwindState);
501	else
502	rc = RTLdrUnwindFrame(pCurModule->hLdrMod, (void const *)pCurModule->uMapping, UINT32_MAX, uRva, &UnwindState);
503	if (RT_SUCCESS(rc))
504	fManualUnwind = false;
505	}
506	if (fManualUnwind)
507	{
508	break;
509	}
510	}
511
512	/*
513	* Destroy the cache.
514	*/
515	PRTDBGSTACKSELFMOD pNextModule;
516	RTListForEachSafe(&CachedModules, pCurModule, pNextModule, RTDBGSTACKSELFMOD, ListEntry)
517	{
518	if (pCurModule->hDbgMod != NIL_RTDBGMOD)
519	{
520	RTDbgModRelease(pCurModule->hDbgMod);
521	pCurModule->hDbgMod = NIL_RTDBGMOD;
522	}
523	if (pCurModule->hLdrMod != NIL_RTLDRMOD)
524	{
525	RTLdrClose(pCurModule->hLdrMod);
526	pCurModule->hLdrMod = NIL_RTLDRMOD;
527	}
528	RTMemFree(pCurModule);
529	}
530
531	return offDst;
532	}
533

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source: vbox/trunk/src/VBox/Runtime/common/dbg/dbgstackdumpself.cpp@ 84204

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