PDMLdr.cpp@ 16281

Last change on this file since 16281 was 14595, checked in by vboxsync, 16 years ago
PDMLdr: RC modules are not accessible from ring-0.
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1	/* $Id: PDMLdr.cpp 14595 2008-11-25 20:21:52Z vboxsync $ */
2	/** @file
3	* PDM - Pluggable Device Manager, module loader.
4	*/
5
6	/*
7	* Copyright (C) 2006-2007 Sun Microsystems, Inc.
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	* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
18	* Clara, CA 95054 USA or visit http://www.sun.com if you need
19	* additional information or have any questions.
20	*/
21
22	//#define PDMLDR_FAKE_MODE
23
24	/*******************************************************************************
25	* Header Files *
26	*******************************************************************************/
27	#define LOG_GROUP LOG_GROUP_PDM_LDR
28	#include "PDMInternal.h"
29	#include <VBox/pdm.h>
30	#include <VBox/mm.h>
31	#include <VBox/vmm.h>
32	#include <VBox/vm.h>
33	#include <VBox/uvm.h>
34	#include <VBox/sup.h>
35	#include <VBox/param.h>
36	#include <VBox/err.h>
37	#include <VBox/hwaccm.h>
38
39	#include <VBox/log.h>
40	#include <iprt/assert.h>
41	#include <iprt/alloc.h>
42	#include <iprt/ldr.h>
43	#include <iprt/path.h>
44	#include <iprt/string.h>
45
46	#include <limits.h>
47
48
49	/*******************************************************************************
50	* Structures and Typedefs *
51	*******************************************************************************/
52	/**
53	* Structure which the user argument of the RTLdrGetBits() callback points to.
54	* @internal
55	*/
56	typedef struct PDMGETIMPORTARGS
57	{
58	PVM pVM;
59	PPDMMOD pModule;
60	} PDMGETIMPORTARGS, *PPDMGETIMPORTARGS;
61
62
63	/*******************************************************************************
64	* Internal Functions *
65	*******************************************************************************/
66	static DECLCALLBACK(int) pdmR3GetImportRC(RTLDRMOD hLdrMod, const char pszModule, const char pszSymbol, unsigned uSymbol, RTUINTPTR pValue, void pvUser);
67	static int pdmR3LoadR0U(PUVM pUVM, const char pszFilename, const char pszName);
68	static char * pdmR3FileRC(const char *pszFile);
69	static char * pdmR3FileR0(const char *pszFile);
70	static char * pdmR3File(const char pszFile, const char pszDefaultExt, bool fShared);
71	static DECLCALLBACK(int) pdmR3QueryModFromEIPEnumSymbols(RTLDRMOD hLdrMod, const char pszSymbol, unsigned uSymbol, RTUINTPTR Value, void pvUser);
72
73
74
75	/**
76	* Loads the VMMR0.r0 module early in the init process.
77	*
78	* @returns VBox status code.
79	* @param pUVM Pointer to the user mode VM structure.
80	*/
81	VMMR3DECL(int) PDMR3LdrLoadVMMR0U(PUVM pUVM)
82	{
83	return pdmR3LoadR0U(pUVM, NULL, VMMR0_MAIN_MODULE_NAME);
84	}
85
86
87	/**
88	* Init the module loader part of PDM.
89	*
90	* This routine will load the Host Context Ring-0 and Guest
91	* Context VMM modules.
92	*
93	* @returns VBox stutus code.
94	* @param pUVM Pointer to the user mode VM structure.
95	* @param pvVMMR0Mod The opqaue returned by PDMR3LdrLoadVMMR0.
96	*/
97	int pdmR3LdrInitU(PUVM pUVM)
98	{
99	#ifdef PDMLDR_FAKE_MODE
100	return VINF_SUCCESS;
101
102	#else
103
104	/*
105	* Load the mandatory GC module, the VMMR0.r0 is loaded before VM creation.
106	*/
107	return PDMR3LdrLoadRC(pUVM->pVM, NULL, VMMGC_MAIN_MODULE_NAME);
108	#endif
109	}
110
111
112	/**
113	* Terminate the module loader part of PDM.
114	*
115	* This will unload and free all modules.
116	*
117	* @param pVM The VM handle.
118	*
119	* @remarks This is normally called twice during termination.
120	*/
121	void pdmR3LdrTermU(PUVM pUVM)
122	{
123	/*
124	* Free the modules.
125	*/
126	PPDMMOD pModule = pUVM->pdm.s.pModules;
127	pUVM->pdm.s.pModules = NULL;
128	while (pModule)
129	{
130	/* free loader item. */
131	if (pModule->hLdrMod != NIL_RTLDRMOD)
132	{
133	int rc2 = RTLdrClose(pModule->hLdrMod);
134	AssertRC(rc2);
135	pModule->hLdrMod = NIL_RTLDRMOD;
136	}
137
138	/* free bits. */
139	switch (pModule->eType)
140	{
141	case PDMMOD_TYPE_R0:
142	{
143	Assert(pModule->ImageBase);
144	int rc2 = SUPFreeModule((void *)(uintptr_t)pModule->ImageBase);
145	AssertRC(rc2);
146	pModule->ImageBase = 0;
147	break;
148	}
149
150	case PDMMOD_TYPE_RC:
151	case PDMMOD_TYPE_R3:
152	/* MM will free this memory for us - it's alloc only memory. :-) */
153	break;
154
155	default:
156	AssertMsgFailed(("eType=%d\n", pModule->eType));
157	break;
158	}
159	pModule->pvBits = NULL;
160
161	void *pvFree = pModule;
162	pModule = pModule->pNext;
163	RTMemFree(pvFree);
164	}
165	}
166
167
168	/**
169	* Applies relocations to GC modules.
170	*
171	* This must be done very early in the relocation
172	* process so that components can resolve GC symbols during relocation.
173	*
174	* @param pUVM Pointer to the user mode VM structure.
175	* @param offDelta Relocation delta relative to old location.
176	*/
177	VMMR3DECL(void) PDMR3LdrRelocateU(PUVM pUVM, RTGCINTPTR offDelta)
178	{
179	LogFlow(("PDMR3LdrRelocate: offDelta=%RGv\n", offDelta));
180
181	/*
182	* GC Modules.
183	*/
184	if (pUVM->pdm.s.pModules)
185	{
186	/*
187	* The relocation have to be done in two passes so imports
188	* can be correctely resolved. The first pass will update
189	* the ImageBase saving the current value in OldImageBase.
190	* The second pass will do the actual relocation.
191	*/
192	/* pass 1 */
193	PPDMMOD pCur;
194	for (pCur = pUVM->pdm.s.pModules; pCur; pCur = pCur->pNext)
195	{
196	if (pCur->eType == PDMMOD_TYPE_RC)
197	{
198	pCur->OldImageBase = pCur->ImageBase;
199	pCur->ImageBase = MMHyperR3ToRC(pUVM->pVM, pCur->pvBits);
200	}
201	}
202
203	/* pass 2 */
204	for (pCur = pUVM->pdm.s.pModules; pCur; pCur = pCur->pNext)
205	{
206	if (pCur->eType == PDMMOD_TYPE_RC)
207	{
208	PDMGETIMPORTARGS Args;
209	Args.pVM = pUVM->pVM;
210	Args.pModule = pCur;
211	int rc = RTLdrRelocate(pCur->hLdrMod, pCur->pvBits, pCur->ImageBase, pCur->OldImageBase,
212	pdmR3GetImportRC, &Args);
213	AssertFatalMsgRC(rc, ("RTLdrRelocate failed, rc=%d\n", rc));
214	DBGFR3ModuleRelocate(pUVM->pVM, pCur->OldImageBase, pCur->ImageBase, RTLdrSize(pCur->hLdrMod),
215	pCur->szFilename, pCur->szName);
216	}
217	}
218	}
219	}
220
221
222	/**
223	* Loads a module into the host context ring-3.
224	*
225	* This is used by the driver and device init functions to load modules
226	* containing the drivers and devices. The function can be extended to
227	* load modules which are not native to the environment we're running in,
228	* but at the moment this is not required.
229	*
230	* No reference counting is kept, since we don't implement any facilities
231	* for unloading the module. But the module will naturally be released
232	* when the VM terminates.
233	*
234	* @returns VBox status code.
235	* @param pUVM Pointer to the user mode VM structure.
236	* @param pszFilename Filename of the module binary.
237	* @param pszName Module name. Case sensitive and the length is limited!
238	*/
239	int pdmR3LoadR3U(PUVM pUVM, const char pszFilename, const char pszName)
240	{
241	/*
242	* Validate input.
243	*/
244	AssertMsg(pUVM->pVM->pdm.s.offVM, ("bad init order!\n"));
245	Assert(pszFilename);
246	size_t cchFilename = strlen(pszFilename);
247	Assert(pszName);
248	size_t cchName = strlen(pszName);
249	PPDMMOD pCur;
250	if (cchName >= sizeof(pCur->szName))
251	{
252	AssertMsgFailed(("Name is too long, cchName=%d pszName='%s'\n", cchName, pszName));
253	return VERR_INVALID_PARAMETER;
254	}
255
256	/*
257	* Try lookup the name and see if the module exists.
258	*/
259	for (pCur = pUVM->pdm.s.pModules; pCur; pCur = pCur->pNext)
260	{
261	if (!strcmp(pCur->szName, pszName))
262	{
263	if (pCur->eType == PDMMOD_TYPE_R3)
264	return VINF_PDM_ALREADY_LOADED;
265	AssertMsgFailed(("We've already got a module '%s' loaded!\n", pszName));
266	return VERR_PDM_MODULE_NAME_CLASH;
267	}
268	}
269
270	/*
271	* Allocate the module list node and initialize it.
272	*/
273	const char *pszSuff = RTLdrGetSuff();
274	size_t cchSuff = RTPathHaveExt(pszFilename) ? 0 : strlen(pszSuff);
275	PPDMMOD pModule = (PPDMMOD)RTMemAllocZ(RT_OFFSETOF(PDMMOD, szFilename[cchFilename + cchSuff + 1]));
276	if (!pModule)
277	return VERR_NO_MEMORY;
278
279	pModule->eType = PDMMOD_TYPE_R3;
280	memcpy(pModule->szName, pszName, cchName); /* memory is zero'ed, no need to copy terminator :-) */
281	memcpy(pModule->szFilename, pszFilename, cchFilename);
282	memcpy(&pModule->szFilename[cchFilename], pszSuff, cchSuff);
283
284	/*
285	* Load the loader item.
286	*/
287	int rc = SUPR3HardenedVerifyFile(pModule->szFilename, "pdmR3LoadR3U", NULL);
288	if (RT_SUCCESS(rc))
289	rc = RTLdrLoad(pModule->szFilename, &pModule->hLdrMod);
290	if (RT_SUCCESS(rc))
291	{
292	pModule->pNext = pUVM->pdm.s.pModules;
293	pUVM->pdm.s.pModules = pModule;
294	return rc;
295	}
296
297	/* Something went wrong, most likely module not found. Don't consider other unlikely errors */
298	rc = VMSetError(pUVM->pVM, rc, RT_SRC_POS, N_("Unable to load R3 module %s (%s)"), pModule->szFilename, pszName);
299	RTMemFree(pModule);
300	return rc;
301	}
302
303
304	/**
305	* Resolve an external symbol during RTLdrGetBits() of a RC module.
306	*
307	* @returns VBox status code.
308	* @param hLdrMod The loader module handle.
309	* @param pszModule Module name.
310	* @param pszSymbol Symbol name, NULL if uSymbol should be used.
311	* @param uSymbol Symbol ordinal, ~0 if pszSymbol should be used.
312	* @param pValue Where to store the symbol value (address).
313	* @param pvUser User argument.
314	*/
315	static DECLCALLBACK(int) pdmR3GetImportRC(RTLDRMOD hLdrMod, const char pszModule, const char pszSymbol, unsigned uSymbol, RTUINTPTR pValue, void pvUser)
316	{
317	PVM pVM = ((PPDMGETIMPORTARGS)pvUser)->pVM;
318	PPDMMOD pModule = ((PPDMGETIMPORTARGS)pvUser)->pModule;
319
320	/*
321	* Adjust input.
322	*/
323	if (pszModule && !*pszModule)
324	pszModule = NULL;
325
326	/*
327	* Builtin module.
328	*/
329	if (!pszModule \|\| !strcmp(pszModule, "VMMGCBuiltin.gc"))
330	{
331	int rc = VINF_SUCCESS;
332	if (!strcmp(pszSymbol, "g_VM"))
333	*pValue = pVM->pVMRC;
334	else if (!strcmp(pszSymbol, "g_CPUM"))
335	*pValue = VM_RC_ADDR(pVM, &pVM->cpum);
336	else if (!strcmp(pszSymbol, "g_TRPM"))
337	*pValue = VM_RC_ADDR(pVM, &pVM->trpm);
338	else if ( !strncmp(pszSymbol, "VMM", 3)
339	\|\| !strcmp(pszSymbol, "g_Logger")
340	\|\| !strcmp(pszSymbol, "g_RelLogger"))
341	{
342	RTRCPTR RCPtr = 0;
343	rc = VMMR3GetImportRC(pVM, pszSymbol, &RCPtr);
344	if (RT_SUCCESS(rc))
345	*pValue = RCPtr;
346	}
347	else if ( !strncmp(pszSymbol, "TM", 2)
348	\|\| !strcmp(pszSymbol, "g_pSUPGlobalInfoPage"))
349	{
350	RTRCPTR RCPtr = 0;
351	rc = TMR3GetImportRC(pVM, pszSymbol, &RCPtr);
352	if (RT_SUCCESS(rc))
353	*pValue = RCPtr;
354	}
355	else
356	{
357	AssertMsg(!pszModule, ("Unknown builtin symbol '%s' for module '%s'!\n", pszSymbol, pModule->szName)); NOREF(pModule);
358	rc = VERR_SYMBOL_NOT_FOUND;
359	}
360	if (RT_SUCCESS(rc) \|\| pszModule)
361	return rc;
362	}
363
364	/*
365	* Search for module.
366	*/
367	PPDMMOD pCur = pVM->pUVM->pdm.s.pModules;
368	while (pCur)
369	{
370	if ( pCur->eType == PDMMOD_TYPE_RC
371	&& ( !pszModule
372	\|\| !strcmp(pCur->szName, pszModule))
373	)
374	{
375	/* Search for the symbol. */
376	int rc = RTLdrGetSymbolEx(pCur->hLdrMod, pCur->pvBits, pCur->ImageBase, pszSymbol, pValue);
377	if (RT_SUCCESS(rc))
378	{
379	AssertMsg(*pValue - pCur->ImageBase < RTLdrSize(pCur->hLdrMod),
380	("%RRv-%RRv %s %RRv\n", (RTRCPTR)pCur->ImageBase,
381	(RTRCPTR)(pCur->ImageBase + RTLdrSize(pCur->hLdrMod) - 1),
382	pszSymbol, (RTRCPTR)*pValue));
383	return rc;
384	}
385	if (pszModule)
386	{
387	AssertMsgFailed(("Couldn't find symbol '%s' in module '%s'!\n", pszSymbol, pszModule));
388	LogRel(("PDMLdr: Couldn't find symbol '%s' in module '%s'!\n", pszSymbol, pszModule));
389	return VERR_SYMBOL_NOT_FOUND;
390	}
391	}
392
393	/* next */
394	pCur = pCur->pNext;
395	}
396
397	AssertMsgFailed(("Couldn't find module '%s' for resolving symbol '%s'!\n", pszModule, pszSymbol));
398	return VERR_SYMBOL_NOT_FOUND;
399	}
400
401
402	/**
403	* Loads a module into the guest context (i.e. into the Hypervisor memory region).
404	*
405	* @returns VBox status code.
406	* @param pVM The VM to load it into.
407	* @param pszFilename Filename of the module binary.
408	* @param pszName Module name. Case sensitive and the length is limited!
409	*/
410	VMMR3DECL(int) PDMR3LdrLoadRC(PVM pVM, const char pszFilename, const char pszName)
411	{
412	/*
413	* Validate input.
414	*/
415	AssertMsg(pVM->pdm.s.offVM, ("bad init order!\n"));
416	PPDMMOD pCur = pVM->pUVM->pdm.s.pModules;
417	while (pCur)
418	{
419	if (!strcmp(pCur->szName, pszName))
420	{
421	AssertMsgFailed(("We've already got a module '%s' loaded!\n", pszName));
422	return VERR_PDM_MODULE_NAME_CLASH;
423	}
424	/* next */
425	pCur = pCur->pNext;
426	}
427
428	/*
429	* Find the file if not specified.
430	*/
431	char *pszFile = NULL;
432	if (!pszFilename)
433	pszFilename = pszFile = pdmR3FileRC(pszName);
434
435	/*
436	* Allocate the module list node.
437	*/
438	PPDMMOD pModule = (PPDMMOD)RTMemAllocZ(sizeof(*pModule) + strlen(pszFilename));
439	if (!pModule)
440	{
441	RTMemTmpFree(pszFile);
442	return VERR_NO_MEMORY;
443	}
444	AssertMsg(strlen(pszName) + 1 < sizeof(pModule->szName),
445	("pazName is too long (%d chars) max is %d chars.\n", strlen(pszName), sizeof(pModule->szName) - 1));
446	strcpy(pModule->szName, pszName);
447	pModule->eType = PDMMOD_TYPE_RC;
448	strcpy(pModule->szFilename, pszFilename);
449
450
451	/*
452	* Open the loader item.
453	*/
454	int rc = SUPR3HardenedVerifyFile(pszFilename, "PDMR3LdrLoadRC", NULL);
455	if (RT_SUCCESS(rc))
456	rc = RTLdrOpen(pszFilename, &pModule->hLdrMod);
457	if (RT_SUCCESS(rc))
458	{
459	/*
460	* Allocate space in the hypervisor.
461	*/
462	size_t cb = RTLdrSize(pModule->hLdrMod);
463	cb = RT_ALIGN_Z(cb, PAGE_SIZE);
464	uint32_t cPages = cb >> PAGE_SHIFT;
465	PSUPPAGE paPages = (PSUPPAGE)RTMemTmpAlloc(cPages * sizeof(paPages[0]));
466	if (paPages)
467	{
468	rc = SUPR3PageAllocEx(cPages, 0 /fFlags/, &pModule->pvBits, NULL /pR0Ptr/, paPages);
469	if (RT_SUCCESS(rc))
470	{
471	RTGCPTR GCPtr;
472	rc = MMR3HyperMapPages(pVM, pModule->pvBits, NIL_RTR0PTR,
473	cPages, paPages, pModule->szName, &GCPtr);
474	if (RT_SUCCESS(rc))
475	{
476	MMR3HyperReserve(pVM, PAGE_SIZE, "fence", NULL);
477
478	/*
479	* Get relocated image bits.
480	*/
481	Assert(MMHyperR3ToRC(pVM, pModule->pvBits) == GCPtr);
482	pModule->ImageBase = GCPtr;
483	PDMGETIMPORTARGS Args;
484	Args.pVM = pVM;
485	Args.pModule = pModule;
486	rc = RTLdrGetBits(pModule->hLdrMod, pModule->pvBits, pModule->ImageBase, pdmR3GetImportRC, &Args);
487	if (RT_SUCCESS(rc))
488	{
489	/*
490	* Insert the module.
491	*/
492	PUVM pUVM = pVM->pUVM;
493	if (pUVM->pdm.s.pModules)
494	{
495	/* we don't expect this list to be very long, so rather save the tail pointer. */
496	PPDMMOD pCur = pUVM->pdm.s.pModules;
497	while (pCur->pNext)
498	pCur = pCur->pNext;
499	pCur->pNext = pModule;
500	}
501	else
502	pUVM->pdm.s.pModules = pModule; /* (pNext is zeroed by alloc) */
503	Log(("PDM: RC Module at %RRv %s (%s)\n", (RTRCPTR)pModule->ImageBase, pszName, pszFilename));
504	RTMemTmpFree(pszFile);
505	RTMemTmpFree(paPages);
506	return VINF_SUCCESS;
507	}
508	}
509	else
510	{
511	AssertRC(rc);
512	SUPR3PageFreeEx(pModule->pvBits, cPages);
513	}
514	}
515	else
516	AssertMsgFailed(("SUPPageAlloc(%d,) -> %Rrc\n", cPages, rc));
517	RTMemTmpFree(paPages);
518	}
519	else
520	rc = VERR_NO_TMP_MEMORY;
521	int rc2 = RTLdrClose(pModule->hLdrMod);
522	AssertRC(rc2);
523	}
524	RTMemFree(pModule);
525	RTMemTmpFree(pszFile);
526
527	/* Don't consider VERR_PDM_MODULE_NAME_CLASH and VERR_NO_MEMORY above as these are very unlikely. */
528	if (RT_FAILURE(rc))
529	return VMSetError(pVM, rc, RT_SRC_POS, N_("Cannot load GC module %s"), pszFilename);
530	return rc;
531	}
532
533
534	/**
535	* Loads a module into the ring-0 context.
536	*
537	* @returns VBox status code.
538	* @param pUVM Pointer to the user mode VM structure.
539	* @param pszFilename Filename of the module binary.
540	* @param pszName Module name. Case sensitive and the length is limited!
541	*/
542	static int pdmR3LoadR0U(PUVM pUVM, const char pszFilename, const char pszName)
543	{
544	/*
545	* Validate input.
546	*/
547	PPDMMOD pCur = pUVM->pdm.s.pModules;
548	while (pCur)
549	{
550	if (!strcmp(pCur->szName, pszName))
551	{
552	AssertMsgFailed(("We've already got a module '%s' loaded!\n", pszName));
553	return VERR_PDM_MODULE_NAME_CLASH;
554	}
555	/* next */
556	pCur = pCur->pNext;
557	}
558
559	/*
560	* Find the file if not specified.
561	*/
562	char *pszFile = NULL;
563	if (!pszFilename)
564	pszFilename = pszFile = pdmR3FileR0(pszName);
565
566	/*
567	* Allocate the module list node.
568	*/
569	PPDMMOD pModule = (PPDMMOD)RTMemAllocZ(sizeof(*pModule) + strlen(pszFilename));
570	if (!pModule)
571	{
572	RTMemTmpFree(pszFile);
573	return VERR_NO_MEMORY;
574	}
575	AssertMsg(strlen(pszName) + 1 < sizeof(pModule->szName),
576	("pazName is too long (%d chars) max is %d chars.\n", strlen(pszName), sizeof(pModule->szName) - 1));
577	strcpy(pModule->szName, pszName);
578	pModule->eType = PDMMOD_TYPE_R0;
579	strcpy(pModule->szFilename, pszFilename);
580
581	/*
582	* Ask the support library to load it.
583	*/
584	void *pvImageBase;
585	int rc = SUPLoadModule(pszFilename, pszName, &pvImageBase);
586	if (RT_SUCCESS(rc))
587	{
588	pModule->hLdrMod = NIL_RTLDRMOD;
589	pModule->ImageBase = (uintptr_t)pvImageBase;
590
591	/*
592	* Insert the module.
593	*/
594	if (pUVM->pdm.s.pModules)
595	{
596	/* we don't expect this list to be very long, so rather save the tail pointer. */
597	PPDMMOD pCur = pUVM->pdm.s.pModules;
598	while (pCur->pNext)
599	pCur = pCur->pNext;
600	pCur->pNext = pModule;
601	}
602	else
603	pUVM->pdm.s.pModules = pModule; /* (pNext is zeroed by alloc) */
604	Log(("PDM: R0 Module at %RHv %s (%s)\n", (RTR0PTR)pModule->ImageBase, pszName, pszFilename));
605	RTMemTmpFree(pszFile);
606	return VINF_SUCCESS;
607	}
608
609	RTMemFree(pModule);
610	RTMemTmpFree(pszFile);
611	LogRel(("pdmR3LoadR0U: pszName=\"%s\" rc=%Rrc\n", pszName, rc));
612
613	/* Don't consider VERR_PDM_MODULE_NAME_CLASH and VERR_NO_MEMORY above as these are very unlikely. */
614	if (RT_FAILURE(rc) && pUVM->pVM) /** @todo VMR3SetErrorU. */
615	return VMSetError(pUVM->pVM, rc, RT_SRC_POS, N_("Cannot load R0 module %s"), pszFilename);
616	return rc;
617	}
618
619
620
621	/**
622	* Get the address of a symbol in a given HC ring 3 module.
623	*
624	* @returns VBox status code.
625	* @param pVM VM handle.
626	* @param pszModule Module name.
627	* @param pszSymbol Symbol name. If it's value is less than 64k it's treated like a
628	* ordinal value rather than a string pointer.
629	* @param ppvValue Where to store the symbol value.
630	*/
631	VMMR3DECL(int) PDMR3LdrGetSymbolR3(PVM pVM, const char pszModule, const char pszSymbol, void **ppvValue)
632	{
633	/*
634	* Validate input.
635	*/
636	AssertMsg(pVM->pdm.s.offVM, ("bad init order!\n"));
637
638	/*
639	* Find the module.
640	*/
641	for (PPDMMOD pModule = pVM->pUVM->pdm.s.pModules; pModule; pModule = pModule->pNext)
642	{
643	if ( pModule->eType == PDMMOD_TYPE_R3
644	&& !strcmp(pModule->szName, pszModule))
645	{
646	RTUINTPTR Value = 0;
647	int rc = RTLdrGetSymbolEx(pModule->hLdrMod, pModule->pvBits, pModule->ImageBase, pszSymbol, &Value);
648	if (RT_SUCCESS(rc))
649	{
650	ppvValue = (void )(uintptr_t)Value;
651	Assert((uintptr_t)*ppvValue == Value);
652	}
653	else
654	{
655	if ((uintptr_t)pszSymbol < 0x10000)
656	AssertMsg(rc, ("Couldn't symbol '%u' in module '%s'\n", (unsigned)(uintptr_t)pszSymbol, pszModule));
657	else
658	AssertMsg(rc, ("Couldn't symbol '%s' in module '%s'\n", pszSymbol, pszModule));
659	}
660	return rc;
661	}
662	}
663
664	AssertMsgFailed(("Couldn't locate module '%s'\n", pszModule));
665	return VERR_SYMBOL_NOT_FOUND;
666	}
667
668
669	/**
670	* Get the address of a symbol in a given HC ring 0 module.
671	*
672	* @returns VBox status code.
673	* @param pVM VM handle.
674	* @param pszModule Module name. If NULL the main R0 module (VMMR0.r0) is assumes.
675	* @param pszSymbol Symbol name. If it's value is less than 64k it's treated like a
676	* ordinal value rather than a string pointer.
677	* @param ppvValue Where to store the symbol value.
678	*/
679	VMMR3DECL(int) PDMR3LdrGetSymbolR0(PVM pVM, const char pszModule, const char pszSymbol, PRTR0PTR ppvValue)
680	{
681	#ifdef PDMLDR_FAKE_MODE
682	*ppvValue = 0xdeadbeef;
683	return VINF_SUCCESS;
684
685	#else
686	/*
687	* Validate input.
688	*/
689	AssertMsg(pVM->pdm.s.offVM, ("bad init order!\n"));
690	if (!pszModule)
691	pszModule = "VMMR0.r0";
692
693	/*
694	* Find the module.
695	*/
696	for (PPDMMOD pModule = pVM->pUVM->pdm.s.pModules; pModule; pModule = pModule->pNext)
697	{
698	if ( pModule->eType == PDMMOD_TYPE_R0
699	&& !strcmp(pModule->szName, pszModule))
700	{
701	int rc = SUPGetSymbolR0((void )(uintptr_t)pModule->ImageBase, pszSymbol, (void *)ppvValue);
702	if (RT_FAILURE(rc))
703	{
704	AssertMsgRC(rc, ("Couldn't find symbol '%s' in module '%s'\n", pszSymbol, pszModule));
705	LogRel(("PDMGetSymbol: Couldn't find symbol '%s' in module '%s'\n", pszSymbol, pszModule));
706	}
707	return rc;
708	}
709	}
710
711	AssertMsgFailed(("Couldn't locate module '%s'\n", pszModule));
712	return VERR_SYMBOL_NOT_FOUND;
713	#endif
714	}
715
716
717	/**
718	* Same as PDMR3LdrGetSymbolR0 except that the module will be attempted loaded if not found.
719	*
720	* @returns VBox status code.
721	* @param pVM VM handle.
722	* @param pszModule Module name. If NULL the main R0 module (VMMR0.r0) is assumed.
723	* @param pszSymbol Symbol name. If it's value is less than 64k it's treated like a
724	* ordinal value rather than a string pointer.
725	* @param ppvValue Where to store the symbol value.
726	*/
727	VMMR3DECL(int) PDMR3LdrGetSymbolR0Lazy(PVM pVM, const char pszModule, const char pszSymbol, PRTR0PTR ppvValue)
728	{
729	#ifdef PDMLDR_FAKE_MODE
730	*ppvValue = 0xdeadbeef;
731	return VINF_SUCCESS;
732
733	#else
734	/*
735	* Since we're lazy, we'll only check if the module is present
736	* and hand it over to PDMR3LdrGetSymbolR0 when that's done.
737	*/
738	AssertMsg(pVM->pdm.s.offVM, ("bad init order!\n"));
739	if (pszModule)
740	{
741	AssertMsgReturn(!strpbrk(pszModule, "/\\:\n\r\t"), ("pszModule=%s\n", pszModule), VERR_INVALID_PARAMETER);
742	PPDMMOD pModule;
743	for (pModule = pVM->pUVM->pdm.s.pModules; pModule; pModule = pModule->pNext)
744	if ( pModule->eType == PDMMOD_TYPE_R0
745	&& !strcmp(pModule->szName, pszModule))
746	break;
747	if (!pModule)
748	{
749	int rc = pdmR3LoadR0U(pVM->pUVM, NULL, pszModule);
750	AssertMsgRCReturn(rc, ("pszModule=%s rc=%Rrc\n", pszModule, rc), VERR_MODULE_NOT_FOUND);
751	}
752	}
753	return PDMR3LdrGetSymbolR0(pVM, pszModule, pszSymbol, ppvValue);
754	#endif
755	}
756
757
758	/**
759	* Get the address of a symbol in a given RC module.
760	*
761	* @returns VBox status code.
762	* @param pVM VM handle.
763	* @param pszModule Module name. If NULL the main R0 module (VMMGC.gc) is assumes.
764	* @param pszSymbol Symbol name. If it's value is less than 64k it's treated like a
765	* ordinal value rather than a string pointer.
766	* @param pRCPtrValue Where to store the symbol value.
767	*/
768	VMMR3DECL(int) PDMR3LdrGetSymbolRC(PVM pVM, const char pszModule, const char pszSymbol, PRTRCPTR pRCPtrValue)
769	{
770	#ifdef PDMLDR_FAKE_MODE
771	*pRCPtrValue = 0xfeedf00d;
772	return VINF_SUCCESS;
773
774	#else
775	/*
776	* Validate input.
777	*/
778	AssertMsg(pVM->pdm.s.offVM, ("bad init order!\n"));
779	if (!pszModule)
780	pszModule = "VMMGC.gc";
781
782	/*
783	* Find the module.
784	*/
785	for (PPDMMOD pModule = pVM->pUVM->pdm.s.pModules; pModule; pModule = pModule->pNext)
786	{
787	if ( pModule->eType == PDMMOD_TYPE_RC
788	&& !strcmp(pModule->szName, pszModule))
789	{
790	RTUINTPTR Value;
791	int rc = RTLdrGetSymbolEx(pModule->hLdrMod, pModule->pvBits, pModule->ImageBase, pszSymbol, &Value);
792	if (RT_SUCCESS(rc))
793	{
794	*pRCPtrValue = (RTGCPTR)Value;
795	Assert(*pRCPtrValue == Value);
796	}
797	else
798	{
799	if ((uintptr_t)pszSymbol < 0x10000)
800	AssertMsg(rc, ("Couldn't symbol '%u' in module '%s'\n", (unsigned)(uintptr_t)pszSymbol, pszModule));
801	else
802	AssertMsg(rc, ("Couldn't symbol '%s' in module '%s'\n", pszSymbol, pszModule));
803	}
804	return rc;
805	}
806	}
807
808	AssertMsgFailed(("Couldn't locate module '%s'\n", pszModule));
809	return VERR_SYMBOL_NOT_FOUND;
810	#endif
811	}
812
813
814	/**
815	* Same as PDMR3LdrGetSymbolRC except that the module will be attempted loaded if not found.
816	*
817	* @returns VBox status code.
818	* @param pVM VM handle.
819	* @param pszModule Module name. If NULL the main R0 module (VMMGC.gc) is assumes.
820	* @param pszSymbol Symbol name. If it's value is less than 64k it's treated like a
821	* ordinal value rather than a string pointer.
822	* @param pRCPtrValue Where to store the symbol value.
823	*/
824	VMMR3DECL(int) PDMR3LdrGetSymbolRCLazy(PVM pVM, const char pszModule, const char pszSymbol, PRTRCPTR pRCPtrValue)
825	{
826	#ifdef PDMLDR_FAKE_MODE
827	*pRCPtrValue = 0xfeedf00d;
828	return VINF_SUCCESS;
829
830	#else
831	/*
832	* Since we're lazy, we'll only check if the module is present
833	* and hand it over to PDMR3LdrGetSymbolRC when that's done.
834	*/
835	AssertMsg(pVM->pdm.s.offVM, ("bad init order!\n"));
836	if (pszModule)
837	{
838	AssertMsgReturn(!strpbrk(pszModule, "/\\:\n\r\t"), ("pszModule=%s\n", pszModule), VERR_INVALID_PARAMETER);
839	PPDMMOD pModule;
840	for (pModule = pVM->pUVM->pdm.s.pModules; pModule; pModule = pModule->pNext)
841	if ( pModule->eType == PDMMOD_TYPE_RC
842	&& !strcmp(pModule->szName, pszModule))
843	break;
844	if (!pModule)
845	{
846	char *pszFilename = pdmR3FileRC(pszModule);
847	AssertMsgReturn(pszFilename, ("pszModule=%s\n", pszModule), VERR_MODULE_NOT_FOUND);
848	int rc = PDMR3LdrLoadRC(pVM, pszFilename, pszModule);
849	RTMemTmpFree(pszFilename);
850	AssertMsgRCReturn(rc, ("pszModule=%s rc=%Rrc\n", pszModule, rc), VERR_MODULE_NOT_FOUND);
851	}
852	}
853	return PDMR3LdrGetSymbolRC(pVM, pszModule, pszSymbol, pRCPtrValue);
854	#endif
855	}
856
857
858	/**
859	* Constructs the full filename for a R3 image file.
860	*
861	* @returns Pointer to temporary memory containing the filename.
862	* Caller must free this using RTMemTmpFree().
863	* @returns NULL on failure.
864	*
865	* @param pszFile File name (no path).
866	*/
867	char pdmR3FileR3(const char pszFile, bool fShared)
868	{
869	return pdmR3File(pszFile, NULL, fShared);
870	}
871
872
873	/**
874	* Constructs the full filename for a R0 image file.
875	*
876	* @returns Pointer to temporary memory containing the filename.
877	* Caller must free this using RTMemTmpFree().
878	* @returns NULL on failure.
879	*
880	* @param pszFile File name (no path).
881	*/
882	char pdmR3FileR0(const char pszFile)
883	{
884	return pdmR3File(pszFile, NULL, /fShared=/false);
885	}
886
887
888	/**
889	* Constructs the full filename for a RC image file.
890	*
891	* @returns Pointer to temporary memory containing the filename.
892	* Caller must free this using RTMemTmpFree().
893	* @returns NULL on failure.
894	*
895	* @param pszFile File name (no path).
896	*/
897	char pdmR3FileRC(const char pszFile)
898	{
899	return pdmR3File(pszFile, NULL, /fShared=/false);
900	}
901
902
903	/**
904	* Worker for pdmR3File().
905	*
906	* @returns Pointer to temporary memory containing the filename.
907	* Caller must free this using RTMemTmpFree().
908	* @returns NULL on failure.
909	*
910	* @param pszDir Directory part
911	* @param pszFile File name part
912	* @param pszDefaultExt Extension part
913	*/
914	static char pdmR3FileConstruct(const char pszDir, const char pszFile, const char pszDefaultExt)
915	{
916	/*
917	* Allocate temp memory for return buffer.
918	*/
919	size_t cchDir = strlen(pszDir);
920	size_t cchFile = strlen(pszFile);
921	size_t cchDefaultExt;
922
923	/*
924	* Default extention?
925	*/
926	if (!pszDefaultExt \|\| strchr(pszFile, '.'))
927	cchDefaultExt = 0;
928	else
929	cchDefaultExt = strlen(pszDefaultExt);
930
931	size_t cchPath = cchDir + 1 + cchFile + cchDefaultExt + 1;
932	AssertMsgReturn(cchPath <= RTPATH_MAX, ("Path too long!\n"), NULL);
933
934	char pszRet = (char )RTMemTmpAlloc(cchDir + 1 + cchFile + cchDefaultExt + 1);
935	AssertMsgReturn(pszRet, ("Out of temporary memory!\n"), NULL);
936
937	/*
938	* Construct the filename.
939	*/
940	memcpy(pszRet, pszDir, cchDir);
941	pszRet[cchDir++] = '/'; /* this works everywhere */
942	memcpy(pszRet + cchDir, pszFile, cchFile + 1);
943	if (cchDefaultExt)
944	memcpy(pszRet + cchDir + cchFile, pszDefaultExt, cchDefaultExt + 1);
945
946	return pszRet;
947	}
948
949
950	/**
951	* Worker for pdmR3FileRC(), pdmR3FileR0() and pdmR3FileR3().
952	*
953	* @returns Pointer to temporary memory containing the filename.
954	* Caller must free this using RTMemTmpFree().
955	* @returns NULL on failure.
956	* @param pszFile File name (no path).
957	* @param pszDefaultExt The default extention, NULL if none.
958	* @param fShared If true, search in the shared directory (/usr/lib on Unix), else
959	* search in the private directory (/usr/lib/virtualbox on Unix).
960	* Ignored if VBOX_PATH_SHARED_LIBS is not defined.
961	* @todo We'll have this elsewhere than in the root later!
962	* @todo Remove the fShared hack again once we don't need to link against VBoxDD anymore!
963	*/
964	static char pdmR3File(const char pszFile, const char *pszDefaultExt, bool fShared)
965	{
966	char szPath[RTPATH_MAX];
967	int rc;
968
969	rc = fShared ? RTPathSharedLibs(szPath, sizeof(szPath))
970	: RTPathAppPrivateArch(szPath, sizeof(szPath));
971	if (!RT_SUCCESS(rc))
972	{
973	AssertMsgFailed(("RTPathProgram(,%d) failed rc=%d!\n", sizeof(szPath), rc));
974	return NULL;
975	}
976
977	return pdmR3FileConstruct(szPath, pszFile, pszDefaultExt);
978	}
979
980
981	/** @internal */
982	typedef struct QMFEIPARG
983	{
984	RTRCUINTPTR uPC;
985
986	char *pszNearSym1;
987	size_t cchNearSym1;
988	RTRCINTPTR offNearSym1;
989
990	char *pszNearSym2;
991	size_t cchNearSym2;
992	RTRCINTPTR offNearSym2;
993	} QMFEIPARG, *PQMFEIPARG;
994
995	/**
996	* Queries module information from an PC (eip/rip).
997	*
998	* This is typically used to locate a crash address.
999	*
1000	* @returns VBox status code.
1001	*
1002	* @param pVM VM handle
1003	* @param uPC The program counter (eip/rip) to locate the module for.
1004	* @param pszModName Where to store the module name.
1005	* @param cchModName Size of the module name buffer.
1006	* @param pMod Base address of the module.
1007	* @param pszNearSym1 Name of the closes symbol from below.
1008	* @param cchNearSym1 Size of the buffer pointed to by pszNearSym1.
1009	* @param pNearSym1 The address of pszNearSym1.
1010	* @param pszNearSym2 Name of the closes symbol from below.
1011	* @param cchNearSym2 Size of the buffer pointed to by pszNearSym2.
1012	* @param pNearSym2 The address of pszNearSym2.
1013	*/
1014	VMMR3DECL(int) PDMR3LdrQueryRCModFromPC(PVM pVM, RTRCPTR uPC,
1015	char *pszModName, size_t cchModName, PRTRCPTR pMod,
1016	char *pszNearSym1, size_t cchNearSym1, PRTRCPTR pNearSym1,
1017	char *pszNearSym2, size_t cchNearSym2, PRTRCPTR pNearSym2)
1018	{
1019	int rc = VERR_MODULE_NOT_FOUND;
1020	PPDMMOD pCur;
1021	for (pCur = pVM->pUVM->pdm.s.pModules; pCur; pCur = pCur->pNext)
1022	{
1023	/* Skip anything which isn't in GC. */
1024	if (pCur->eType != PDMMOD_TYPE_RC)
1025	continue;
1026	if (uPC - pCur->ImageBase < RTLdrSize(pCur->hLdrMod))
1027	{
1028	if (pMod)
1029	*pMod = pCur->ImageBase;
1030	if (pszModName && cchModName)
1031	{
1032	*pszModName = '\0';
1033	strncat(pszModName, pCur->szName, cchModName);
1034	}
1035	if (pNearSym1) *pNearSym1 = 0;
1036	if (pNearSym2) *pNearSym2 = 0;
1037	if (pszNearSym1) *pszNearSym1 = '\0';
1038	if (pszNearSym2) *pszNearSym2 = '\0';
1039
1040	/*
1041	* Locate the nearest symbols.
1042	*/
1043	QMFEIPARG Args;
1044	Args.uPC = uPC;
1045	Args.pszNearSym1 = pszNearSym1;
1046	Args.cchNearSym1 = cchNearSym1;
1047	Args.offNearSym1 = RTRCINTPTR_MIN;
1048	Args.pszNearSym2 = pszNearSym2;
1049	Args.cchNearSym2 = cchNearSym2;
1050	Args.offNearSym2 = RTRCINTPTR_MAX;
1051
1052	rc = RTLdrEnumSymbols(pCur->hLdrMod, RTLDR_ENUM_SYMBOL_FLAGS_ALL, pCur->pvBits, pCur->ImageBase,
1053	pdmR3QueryModFromEIPEnumSymbols, &Args);
1054	if (pNearSym1 && Args.offNearSym1 != INT_MIN)
1055	*pNearSym1 = Args.offNearSym1 + uPC;
1056	if (pNearSym2 && Args.offNearSym2 != INT_MAX)
1057	*pNearSym2 = Args.offNearSym2 + uPC;
1058
1059	rc = VINF_SUCCESS;
1060	if (pCur->eType == PDMMOD_TYPE_RC)
1061	break;
1062	}
1063
1064	}
1065	return rc;
1066	}
1067
1068
1069	/**
1070	* Enumeration callback function used by RTLdrEnumSymbols().
1071	*
1072	* @returns VBox status code. Failure will stop the enumeration.
1073	* @param hLdrMod The loader module handle.
1074	* @param pszSymbol Symbol name. NULL if ordinal only.
1075	* @param uSymbol Symbol ordinal, ~0 if not used.
1076	* @param Value Symbol value.
1077	* @param pvUser The user argument specified to RTLdrEnumSymbols().
1078	*/
1079	static DECLCALLBACK(int) pdmR3QueryModFromEIPEnumSymbols(RTLDRMOD hLdrMod, const char pszSymbol, unsigned uSymbol, RTUINTPTR Value, void pvUser)
1080	{
1081	PQMFEIPARG pArgs = (PQMFEIPARG)pvUser;
1082
1083	RTINTPTR off = Value - pArgs->uPC;
1084	if (off <= 0) /* near1 is before or at same location. */
1085	{
1086	if (off > pArgs->offNearSym1)
1087	{
1088	pArgs->offNearSym1 = off;
1089	if (pArgs->pszNearSym1 && pArgs->cchNearSym1)
1090	{
1091	*pArgs->pszNearSym1 = '\0';
1092	if (pszSymbol)
1093	strncat(pArgs->pszNearSym1, pszSymbol, pArgs->cchNearSym1);
1094	else
1095	{
1096	char szOrd[32];
1097	RTStrPrintf(szOrd, sizeof(szOrd), "#%#x", uSymbol);
1098	strncat(pArgs->pszNearSym1, szOrd, pArgs->cchNearSym1);
1099	}
1100	}
1101	}
1102	}
1103	else /* near2 is after */
1104	{
1105	if (off < pArgs->offNearSym2)
1106	{
1107	pArgs->offNearSym2 = off;
1108	if (pArgs->pszNearSym2 && pArgs->cchNearSym2)
1109	{
1110	*pArgs->pszNearSym2 = '\0';
1111	if (pszSymbol)
1112	strncat(pArgs->pszNearSym2, pszSymbol, pArgs->cchNearSym2);
1113	else
1114	{
1115	char szOrd[32];
1116	RTStrPrintf(szOrd, sizeof(szOrd), "#%#x", uSymbol);
1117	strncat(pArgs->pszNearSym2, szOrd, pArgs->cchNearSym2);
1118	}
1119	}
1120	}
1121	}
1122
1123	return VINF_SUCCESS;
1124	}
1125
1126
1127	/**
1128	* Enumerate all PDM modules.
1129	*
1130	* @returns VBox status.
1131	* @param pVM VM Handle.
1132	* @param pfnCallback Function to call back for each of the modules.
1133	* @param pvArg User argument.
1134	*/
1135	VMMR3DECL(int) PDMR3LdrEnumModules(PVM pVM, PFNPDMR3ENUM pfnCallback, void *pvArg)
1136	{
1137	PPDMMOD pCur;
1138	for (pCur = pVM->pUVM->pdm.s.pModules; pCur; pCur = pCur->pNext)
1139	{
1140	int rc = pfnCallback(pVM,
1141	pCur->szFilename,
1142	pCur->szName,
1143	pCur->ImageBase,
1144	pCur->eType == PDMMOD_TYPE_RC ? RTLdrSize(pCur->hLdrMod) : 0,
1145	pCur->eType == PDMMOD_TYPE_RC,
1146	pvArg);
1147	if (RT_FAILURE(rc))
1148	return rc;
1149	}
1150	return VINF_SUCCESS;
1151	}
1152

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source: vbox/trunk/src/VBox/VMM/PDMLdr.cpp@ 16281

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