ldrELFRelocatable.cpp.h@ 4968

Last change on this file since 4968 was 4071, checked in by vboxsync, 17 years ago
Biggest check-in ever. New source code headers for all (C) innotek files.
Property svn:eol-style set to `native` Property svn:keywords set to `Id`
File size: 42.2 KB

Line
1	/* $Id: ldrELFRelocatable.cpp.h 4071 2007-08-07 17:07:59Z vboxsync $ */
2	/** @file
3	* innotek Portable Runtime - Binary Image Loader, Template for ELF Relocatable Images.
4	*/
5
6	/*
7	* Copyright (C) 2006-2007 innotek GmbH
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 as published by the Free Software Foundation,
13	* in version 2 as it comes in the "COPYING" file of the VirtualBox OSE
14	* distribution. VirtualBox OSE is distributed in the hope that it will
15	* be useful, but WITHOUT ANY WARRANTY of any kind.
16	*/
17
18	/*******************************************************************************
19	* Defined Constants And Macros *
20	*******************************************************************************/
21	#if ELF_MODE == 32
22	#define RTLDRELF_NAME(name) rtldrELF32##name
23	#define RTLDRELF_SUFF(name) name##32
24	#define RTLDRELF_MID(pre,suff) pre##32##suff
25	#define FMT_ELF_ADDR "%08RX32"
26	#define FMT_ELF_HALF "%04RX16"
27	#define FMT_ELF_OFF "%08RX32"
28	#define FMT_ELF_SIZE "%08RX32"
29	#define FMT_ELF_SWORD "%RI32"
30	#define FMT_ELF_WORD "%08RX32"
31	#define FMT_ELF_XWORD "%08RX32"
32	#define FMT_ELF_SXWORD "%RI32"
33
34	#elif ELF_MODE == 64
35	#define RTLDRELF_NAME(name) rtldrELF64##name
36	#define RTLDRELF_SUFF(name) name##64
37	#define RTLDRELF_MID(pre,suff) pre##64##suff
38	#define FMT_ELF_ADDR "%016RX64"
39	#define FMT_ELF_HALF "%04RX16"
40	#define FMT_ELF_SHALF "%RI16"
41	#define FMT_ELF_OFF "%016RX64"
42	#define FMT_ELF_SIZE "%016RX64"
43	#define FMT_ELF_SWORD "%RI32"
44	#define FMT_ELF_WORD "%08RX32"
45	#define FMT_ELF_XWORD "%016RX64"
46	#define FMT_ELF_SXWORD "%RI64"
47	#endif
48
49	#define Elf_Ehdr RTLDRELF_MID(Elf,_Ehdr)
50	#define Elf_Phdr RTLDRELF_MID(Elf,_Phdr)
51	#define Elf_Shdr RTLDRELF_MID(Elf,_Shdr)
52	#define Elf_Sym RTLDRELF_MID(Elf,_Sym)
53	#define Elf_Rel RTLDRELF_MID(Elf,_Rel)
54	#define Elf_Rela RTLDRELF_MID(Elf,_Rela)
55	#define Elf_Nhdr RTLDRELF_MID(Elf,_Nhdr)
56	#define Elf_Dyn RTLDRELF_MID(Elf,_Dyn)
57	#define Elf_Addr RTLDRELF_MID(Elf,_Addr)
58	#define Elf_Half RTLDRELF_MID(Elf,_Half)
59	#define Elf_Off RTLDRELF_MID(Elf,_Off)
60	#define Elf_Size RTLDRELF_MID(Elf,_Size)
61	#define Elf_Sword RTLDRELF_MID(Elf,_Sword)
62	#define Elf_Word RTLDRELF_MID(Elf,_Word)
63
64	#define RTLDRMODELF RTLDRELF_MID(RTLDRMODELF,)
65	#define PRTLDRMODELF RTLDRELF_MID(PRTLDRMODELF,)
66
67	#define ELF_R_SYM(info) RTLDRELF_MID(ELF,_R_SYM)(info)
68	#define ELF_R_TYPE(info) RTLDRELF_MID(ELF,_R_TYPE)(info)
69	#define ELF_R_INFO(sym, type) RTLDRELF_MID(ELF,_R_INFO)(sym, type)
70
71	#define ELF_ST_BIND(info) RTLDRELF_MID(ELF,_ST_BIND)(info)
72
73
74
75	/*******************************************************************************
76	* Structures and Typedefs *
77	*******************************************************************************/
78	/**
79	* The ELF loader structure.
80	*/
81	typedef struct RTLDRMODELF
82	{
83	/** Core module structure. */
84	RTLDRMODINTERNAL Core;
85	/** Pointer to the reader instance. */
86	PRTLDRREADER pReader;
87	/** Pointer to readonly mapping of the image bits.
88	* This mapping is provided by the pReader. */
89	const void *pvBits;
90
91	/** The ELF header. */
92	Elf_Ehdr Ehdr;
93	/** Pointer to our copy of the section headers.
94	* The virtual addresses in this array is the 0 based assignments we've given the image.
95	* Not valid if the image is DONE. */
96	Elf_Shdr *paShdrs;
97	/** The size of the loaded image. */
98	size_t cbImage;
99
100	/** The symbol section index. */
101	unsigned iSymSh;
102	/** Number of symbols in the table. */
103	unsigned cSyms;
104	/** Pointer to symbol table within RTLDRMODELF::pvBits. */
105	const Elf_Sym *paSyms;
106
107	/** The string section index. */
108	unsigned iStrSh;
109	/** Size of the string table. */
110	unsigned cbStr;
111	/** Pointer to string table within RTLDRMODELF::pvBits. */
112	const char *pStr;
113	} RTLDRMODELF, *PRTLDRMODELF;
114
115
116	/**
117	* Maps the image bits into memory and resolve pointers into it.
118	*
119	* @returns iprt status code.
120	* @param pModElf The ELF loader module instance data.
121	* @param fNeedsBits Set if we actually need the pvBits member.
122	* If we don't, we can simply read the string and symbol sections, thus saving memory.
123	*/
124	static int RTLDRELF_NAME(MapBits)(PRTLDRMODELF pModElf, bool fNeedsBits)
125	{
126	NOREF(fNeedsBits);
127	if (pModElf->pvBits)
128	return VINF_SUCCESS;
129	int rc = pModElf->pReader->pfnMap(pModElf->pReader, &pModElf->pvBits);
130	if (RT_SUCCESS(rc))
131	{
132	const uint8_t pu8 = (const uint8_t )pModElf->pvBits;
133	pModElf->paSyms = (const Elf_Sym *)(pu8 + pModElf->paShdrs[pModElf->iSymSh].sh_offset);
134	pModElf->pStr = (const char *)(pu8 + pModElf->paShdrs[pModElf->iStrSh].sh_offset);
135	}
136	return rc;
137	}
138
139
140	/**
141	* Get the symbol and symbol value.
142	*
143	* @returns iprt status code.
144	* @param pModElf The ELF loader module instance data.
145	* @param BaseAddr The base address which the module is being fixedup to.
146	* @param pfnGetImport The callback function to use to resolve imports (aka unresolved externals).
147	* @param pvUser User argument to pass to the callback.
148	* @param iSym The symbol to get.
149	* @param ppSym Where to store the symbol pointer on success. (read only)
150	* @param pSymValue Where to store the symbol value on success.
151	*/
152	static int RTLDRELF_NAME(Symbol)(PRTLDRMODELF pModElf, Elf_Addr BaseAddr, PFNRTLDRIMPORT pfnGetImport, void *pvUser,
153	Elf_Size iSym, const Elf_Sym *ppSym, Elf_Addr pSymValue)
154	{
155	/*
156	* Validate and find the symbol.
157	*/
158	if (iSym >= pModElf->cSyms)
159	{
160	AssertMsgFailed(("iSym=%d is an invalid symbol index!\n", iSym));
161	return VERR_LDRELF_INVALID_SYMBOL_INDEX;
162	}
163	const Elf_Sym *pSym = &pModElf->paSyms[iSym];
164	*ppSym = pSym;
165
166	if (pSym->st_name >= pModElf->cbStr)
167	{
168	AssertMsgFailed(("iSym=%d st_name=%d str sh_size=%d\n", iSym, pSym->st_name, pModElf->cbStr));
169	return VERR_LDRELF_INVALID_SYMBOL_NAME_OFFSET;
170	}
171	const char *pszName = ELF_STR(pModElf, pSym->st_name);
172
173	/*
174	* Determin the symbol value.
175	*
176	* Symbols needs different treatment depending on which section their are in.
177	* Undefined and absolute symbols goes into special non-existing sections.
178	*/
179	switch (pSym->st_shndx)
180	{
181	/*
182	* Undefined symbol, needs resolving.
183	*
184	* Since ELF has no generic concept of importing from specific module (the OS/2 ELF format
185	* has but that's a OS extension and only applies to programs and dlls), we'll have to ask
186	* the resolver callback to do a global search.
187	*/
188	case SHN_UNDEF:
189	{
190	/* Try to resolve the symbol. */
191	RTUINTPTR Value;
192	int rc = pfnGetImport(&pModElf->Core, "", pszName, ~0, &Value, pvUser);
193	if (RT_FAILURE(rc))
194	{
195	AssertMsgFailed(("Failed to resolve '%s' rc=%Rrc\n", pszName, rc));
196	return rc;
197	}
198	*pSymValue = (Elf_Addr)Value;
199	if ((RTUINTPTR)*pSymValue != Value)
200	{
201	AssertMsgFailed(("Symbol value overflowed! '%s'\n", pszName));
202	return VERR_SYMBOL_VALUE_TOO_BIG;
203	}
204
205	Log2(("rtldrELF: #%-3d - UNDEF " FMT_ELF_ADDR " '%s'\n", iSym, *pSymValue, pszName));
206	break;
207	}
208
209	/*
210	* Absolute symbols needs no fixing since they are, well, absolute.
211	*/
212	case SHN_ABS:
213	*pSymValue = pSym->st_value;
214	Log2(("rtldrELF: #%-3d - ABS " FMT_ELF_ADDR " '%s'\n", iSym, *pSymValue, pszName));
215	break;
216
217	/*
218	* All other symbols are adressed relative to their section and need to be fixed up.
219	*/
220	default:
221	if (pSym->st_shndx >= pModElf->Ehdr.e_shnum)
222	{
223	/* what about common symbols? */
224	AssertMsg(pSym->st_shndx < pModElf->Ehdr.e_shnum,
225	("iSym=%d st_shndx=%d e_shnum=%d pszName=%s\n", iSym, pSym->st_shndx, pModElf->Ehdr.e_shnum, pszName));
226	return VERR_BAD_EXE_FORMAT;
227	}
228	*pSymValue = pSym->st_value + pModElf->paShdrs[pSym->st_shndx].sh_addr + BaseAddr;
229	Log2(("rtldrELF: #%-3d - %5d " FMT_ELF_ADDR " '%s'\n", iSym, pSym->st_shndx, *pSymValue, pszName));
230	break;
231	}
232
233	return VINF_SUCCESS;
234	}
235
236
237	/**
238	* Applies the fixups for a sections.
239	*
240	* @returns iprt status code.
241	* @param pModElf The ELF loader module instance data.
242	* @param BaseAddr The base address which the module is being fixedup to.
243	* @param pfnGetImport The callback function to use to resolve imports (aka unresolved externals).
244	* @param pvUser User argument to pass to the callback.
245	* @param SecAddr The section address. This is the address the relocations are relative to.
246	* @param cbSec The section size. The relocations must be inside this.
247	* @param pu8SecBaseR Where we read section bits from.
248	* @param pu8SecBaseW Where we write section bits to.
249	* @param pvRelocs Pointer to where we read the relocations from.
250	* @param cbRelocs Size of the relocations.
251	*/
252	static int RTLDRELF_NAME(RelocateSection)(PRTLDRMODELF pModElf, Elf_Addr BaseAddr, PFNRTLDRIMPORT pfnGetImport, void *pvUser,
253	const Elf_Addr SecAddr, Elf_Size cbSec, const uint8_t pu8SecBaseR, uint8_t pu8SecBaseW,
254	const void *pvRelocs, Elf_Size cbRelocs)
255	{
256	/*
257	* Iterate the relocations.
258	* The relocations are stored in an array of Elf32_Rel records and covers the entire relocation section.
259	*/
260	const Elf_Reloc paRels = (const Elf_Reloc )pvRelocs;
261	const unsigned iRelMax = (unsigned)(cbRelocs / sizeof(paRels[0]));
262	AssertMsgReturn(iRelMax == cbRelocs / sizeof(paRels[0]), (FMT_ELF_SIZE "\n", cbRelocs / sizeof(paRels[0])), VERR_IMAGE_TOO_BIG);
263	for (unsigned iRel = 0; iRel < iRelMax; iRel++)
264	{
265	/*
266	* Get the symbol.
267	*/
268	const Elf_Sym *pSym;
269	Elf_Addr SymValue = 0; /* shut up gcc-4 */
270	int rc = RTLDRELF_NAME(Symbol)(pModElf, BaseAddr, pfnGetImport, pvUser, ELF_R_SYM(paRels[iRel].r_info), &pSym, &SymValue);
271	if (RT_FAILURE(rc))
272	return rc;
273
274	Log3(("rtldrELF: " FMT_ELF_ADDR " %02x %06x - " FMT_ELF_ADDR " %3d %02x %s\n",
275	paRels[iRel].r_offset, ELF_R_TYPE(paRels[iRel].r_info), (unsigned)ELF_R_SYM(paRels[iRel].r_info),
276	SymValue, (unsigned)pSym->st_shndx, pSym->st_info, ELF_STR(pModElf, pSym->st_name)));
277
278	/*
279	* Apply the fixup.
280	*/
281	AssertMsgReturn(paRels[iRel].r_offset < cbSec, (FMT_ELF_ADDR " " FMT_ELF_SIZE "\n", paRels[iRel].r_offset, cbSec), VERR_LDRELF_INVALID_RELOCATION_OFFSET);
282	#if ELF_MODE == 32
283	const Elf_Addr pAddrR = (const Elf_Addr )(pu8SecBaseR + paRels[iRel].r_offset); /* Where to read the addend. */
284	#endif
285	Elf_Addr pAddrW = (Elf_Addr )(pu8SecBaseW + paRels[iRel].r_offset); /* Where to write the fixup. */
286	switch (ELF_R_TYPE(paRels[iRel].r_info))
287	{
288	#if ELF_MODE == 32
289	/*
290	* Absolute addressing.
291	*/
292	case R_386_32:
293	{
294	const Elf_Addr Value = SymValue + *pAddrR;
295	(uint32_t )pAddrW = Value;
296	Log4((FMT_ELF_ADDR": R_386_32 Value=" FMT_ELF_ADDR " SymValue=" FMT_ELF_ADDR "\n",
297	SecAddr + paRels[iRel].r_offset + BaseAddr, Value, SymValue));
298	break;
299	}
300
301	/*
302	* PC relative addressing.
303	*/
304	case R_386_PC32:
305	{
306	const Elf_Addr SourceAddr = SecAddr + paRels[iRel].r_offset + BaseAddr; /* Where the source really is. */
307	const Elf_Addr Value = SymValue + (uint32_t )pAddrR - SourceAddr;
308	(uint32_t )pAddrW = Value;
309	Log4((FMT_ELF_ADDR": R_386_PC32 Value=" FMT_ELF_ADDR " SymValue=" FMT_ELF_ADDR "\n",
310	SourceAddr, Value, SymValue));
311	break;
312	}
313
314	/* ignore */
315	case R_386_NONE:
316	break;
317
318	#elif ELF_MODE == 64
319
320	/*
321	* Absolute addressing
322	*/
323	case R_X86_64_64:
324	{
325	const Elf_Addr Value = SymValue + paRels[iRel].r_addend;
326	(uint64_t )pAddrW = Value;
327	Log4((FMT_ELF_ADDR": R_X86_64_64 Value=" FMT_ELF_ADDR " SymValue=" FMT_ELF_ADDR "\n",
328	SecAddr + paRels[iRel].r_offset + BaseAddr, Value, SymValue));
329	break;
330	}
331
332	/*
333	* Trunacated 32-bit value (zero-extendedable to the 64-bit value).
334	*/
335	case R_X86_64_32:
336	{
337	const Elf_Addr Value = SymValue + paRels[iRel].r_addend;
338	(uint32_t )pAddrW = (uint32_t)Value;
339	Log4((FMT_ELF_ADDR": R_X86_64_32 Value=" FMT_ELF_ADDR " SymValue=" FMT_ELF_ADDR "\n",
340	SecAddr + paRels[iRel].r_offset + BaseAddr, Value, SymValue));
341	AssertMsgReturn((Elf_Addr)(uint32_t )pAddrW == Value, ("Value=" FMT_ELF_ADDR "\n", Value), VERR_SYMBOL_VALUE_TOO_BIG);
342	break;
343	}
344
345	/*
346	* Truncated 32-bit value (sign-extendedable to the 64-bit value).
347	*/
348	case R_X86_64_32S:
349	{
350	const Elf_Addr Value = SymValue + paRels[iRel].r_addend;
351	(int32_t )pAddrW = (int32_t)Value;
352	Log4((FMT_ELF_ADDR": R_X86_64_32S Value=" FMT_ELF_ADDR " SymValue=" FMT_ELF_ADDR "\n",
353	SecAddr + paRels[iRel].r_offset + BaseAddr, Value, SymValue));
354	AssertMsgReturn((Elf_Addr)(int32_t )pAddrW == Value, ("Value=" FMT_ELF_ADDR "\n", Value), VERR_SYMBOL_VALUE_TOO_BIG); /** @todo check the sign-extending here. */
355	break;
356	}
357
358	/*
359	* PC relative addressing.
360	*/
361	case R_X86_64_PC32:
362	{
363	const Elf_Addr SourceAddr = SecAddr + paRels[iRel].r_offset + BaseAddr; /* Where the source really is. */
364	const Elf_Addr Value = SymValue + paRels[iRel].r_addend - SourceAddr;
365	(int32_t )pAddrW = (int32_t)Value;
366	Log4((FMT_ELF_ADDR": R_X86_64_PC32 Value=" FMT_ELF_ADDR " SymValue=" FMT_ELF_ADDR "\n",
367	SourceAddr, Value, SymValue));
368	AssertMsgReturn((Elf_Addr)(int32_t )pAddrW == Value, ("Value=" FMT_ELF_ADDR "\n", Value), VERR_SYMBOL_VALUE_TOO_BIG); /** @todo check the sign-extending here. */
369	break;
370	}
371
372	/* ignore */
373	case R_X86_64_NONE:
374	break;
375	#endif
376
377	default:
378	AssertMsgFailed(("Unknown relocation type: %d (iRel=%d iRelMax=%d)\n",
379	ELF_R_TYPE(paRels[iRel].r_info), iRel, iRelMax));
380	return VERR_LDRELF_RELOCATION_NOT_SUPPORTED;
381	}
382	}
383
384	return VINF_SUCCESS;
385	}
386
387
388
389	/** @copydoc RTLDROPS::pfnClose */
390	static DECLCALLBACK(int) RTLDRELF_NAME(Close)(PRTLDRMODINTERNAL pMod)
391	{
392	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
393
394	if (pModElf->paShdrs)
395	{
396	RTMemFree(pModElf->paShdrs);
397	pModElf->paShdrs = NULL;
398	}
399
400	if (pModElf->pReader)
401	{
402	pModElf->pReader->pfnDestroy(pModElf->pReader);
403	pModElf->pReader = NULL;
404	}
405
406	pModElf->pvBits = NULL;
407
408	return VINF_SUCCESS;
409	}
410
411
412	/** @copydoc RTLDROPS::Done */
413	static DECLCALLBACK(int) RTLDRELF_NAME(Done)(PRTLDRMODINTERNAL pMod)
414	{
415	//PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
416	/** @todo Have to think more about this .... */
417	return -1;
418	}
419
420
421	/** @copydoc RTLDROPS::EnumSymbols */
422	static DECLCALLBACK(int) RTLDRELF_NAME(EnumSymbols)(PRTLDRMODINTERNAL pMod, unsigned fFlags, const void *pvBits, RTUINTPTR BaseAddress,
423	PFNRTLDRENUMSYMS pfnCallback, void *pvUser)
424	{
425	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
426
427	/*
428	* Validate the input.
429	*/
430	Elf_Addr BaseAddr = (Elf_Addr)BaseAddress;
431	AssertMsgReturn((RTUINTPTR)BaseAddr == BaseAddress, ("#RTptr", BaseAddress), VERR_IMAGE_BASE_TOO_HIGH);
432
433	/*
434	* Make sure we've got the string and symbol tables. (We don't need the pvBits.)
435	*/
436	int rc = RTLDRELF_NAME(MapBits)(pModElf, false);
437	if (RT_FAILURE(rc))
438	return rc;
439
440	/*
441	* Enumerate the symbol table.
442	*/
443	const Elf_Sym *paSyms = pModElf->paSyms;
444	unsigned cSyms = pModElf->cSyms;
445	for (unsigned iSym = 1; iSym < cSyms; iSym++)
446	{
447	/*
448	* Skip imports (undefined).
449	*/
450	if (paSyms[iSym].st_shndx != SHN_UNDEF)
451	{
452	/*
453	* Calc value and get name.
454	*/
455	Elf_Addr Value;
456	if (paSyms[iSym].st_shndx == SHN_ABS)
457	/* absolute symbols are not subject to any relocation. */
458	Value = paSyms[iSym].st_value;
459	else if (paSyms[iSym].st_shndx < pModElf->Ehdr.e_shnum)
460	/* relative to the section. */
461	Value = BaseAddr + paSyms[iSym].st_value + pModElf->paShdrs[paSyms[iSym].st_shndx].sh_addr;
462	else
463	{
464	AssertMsgFailed(("Arg! paSyms[%u].st_shndx=" FMT_ELF_HALF "\n", iSym, paSyms[iSym].st_shndx));
465	return VERR_BAD_EXE_FORMAT;
466	}
467	const char *pszName = ELF_STR(pModElf, paSyms[iSym].st_name);
468	if ( (pszName && *pszName)
469	&& ( (fFlags & RTLDR_ENUM_SYMBOL_FLAGS_ALL)
470	\|\| ELF_ST_BIND(paSyms[iSym].st_info) == STB_GLOBAL)
471	)
472	{
473	/*
474	* Call back.
475	*/
476	AssertMsgReturn(Value == (RTUINTPTR)Value, (FMT_ELF_ADDR "\n", Value), VERR_SYMBOL_VALUE_TOO_BIG);
477	int rc = pfnCallback(pMod, pszName, ~0, (RTUINTPTR)Value, pvUser);
478	if (rc)
479	return rc;
480	}
481	}
482	}
483
484	return VINF_SUCCESS;
485	}
486
487
488	/** @copydoc RTLDROPS::GetImageSize */
489	static DECLCALLBACK(size_t) RTLDRELF_NAME(GetImageSize)(PRTLDRMODINTERNAL pMod)
490	{
491	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
492
493	return pModElf->cbImage;
494	}
495
496
497	/** @copydoc RTLDROPS::GetBits */
498	static DECLCALLBACK(int) RTLDRELF_NAME(GetBits)(PRTLDRMODINTERNAL pMod, void pvBits, RTUINTPTR BaseAddress, PFNRTLDRIMPORT pfnGetImport, void pvUser)
499	{
500	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
501
502	/*
503	* Load the bits into pvBits.
504	*/
505	const Elf_Shdr *paShdrs = pModElf->paShdrs;
506	for (unsigned iShdr = 0; iShdr < pModElf->Ehdr.e_shnum; iShdr++)
507	{
508	if (paShdrs[iShdr].sh_flags & SHF_ALLOC)
509	{
510	AssertMsgReturn((size_t)paShdrs[iShdr].sh_size == (size_t)paShdrs[iShdr].sh_size, (FMT_ELF_SIZE "\n", paShdrs[iShdr].sh_size), VERR_IMAGE_TOO_BIG);
511	switch (paShdrs[iShdr].sh_type)
512	{
513	case SHT_NOBITS:
514	memset((uint8_t *)pvBits + paShdrs[iShdr].sh_addr, 0, (size_t)paShdrs[iShdr].sh_size);
515	break;
516
517	case SHT_PROGBITS:
518	default:
519	{
520	int rc = pModElf->pReader->pfnRead(pModElf->pReader, (uint8_t *)pvBits + paShdrs[iShdr].sh_addr,
521	(size_t)paShdrs[iShdr].sh_size, paShdrs[iShdr].sh_offset);
522	if (RT_FAILURE(rc))
523	{
524	Log(("RTLdrELF: %s: Read error when reading " FMT_ELF_SIZE " bytes at " FMT_ELF_OFF ", iShdr=%d\n",
525	pModElf->pReader->pfnLogName(pModElf->pReader),
526	paShdrs[iShdr].sh_size, paShdrs[iShdr].sh_offset, iShdr));
527	return rc;
528	}
529	}
530	}
531	}
532	}
533
534	/*
535	* Relocate the image.
536	*/
537	return pModElf->Core.pOps->pfnRelocate(pMod, pvBits, BaseAddress, ~(RTUINTPTR)0, pfnGetImport, pvUser);
538	}
539
540
541	/** @copydoc RTLDROPS::Relocate */
542	static DECLCALLBACK(int) RTLDRELF_NAME(Relocate)(PRTLDRMODINTERNAL pMod, void pvBits, RTUINTPTR NewBaseAddress, RTUINTPTR OldBaseAddress, PFNRTLDRIMPORT pfnGetImport, void pvUser)
543	{
544	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
545
546	/*
547	* Validate the input.
548	*/
549	Elf_Addr BaseAddr = (Elf_Addr)NewBaseAddress;
550	AssertMsgReturn((RTUINTPTR)BaseAddr == NewBaseAddress, ("#RTptr", NewBaseAddress), VERR_IMAGE_BASE_TOO_HIGH);
551
552	/*
553	* Map the image bits if not already done and setup pointer into it.
554	*/
555	int rc = RTLDRELF_NAME(MapBits)(pModElf, true);
556	if (RT_FAILURE(rc))
557	return rc;
558
559	/*
560	* Iterate the sections looking for interesting SHT_REL[A] sections.
561	* SHT_REL[A] sections have the section index of the section they contain fixups
562	* for in the sh_info member.
563	*/
564	const Elf_Shdr *paShdrs = pModElf->paShdrs;
565	#ifdef LOG_ENABLED
566	const char *pszLogName = pModElf->pReader->pfnLogName(pModElf->pReader);
567	Log2(("rtLdrElf: %s: Fixing up image\n", pszLogName));
568	#endif
569	for (unsigned iShdr = 0; iShdr < pModElf->Ehdr.e_shnum; iShdr++)
570	{
571	const Elf_Shdr *pShdrRel = &paShdrs[iShdr];
572
573	/*
574	* Skip sections without interest to us.
575	*/
576	#if ELF_MODE == 32
577	if (pShdrRel->sh_type != SHT_REL)
578	#else
579	if (pShdrRel->sh_type != SHT_RELA)
580	#endif
581	continue;
582	if (pShdrRel->sh_info >= pModElf->Ehdr.e_shnum)
583	continue;
584	const Elf_Shdr pShdr = &paShdrs[pShdrRel->sh_info]; / the section to fixup. */
585	if (!(pShdr->sh_flags & SHF_ALLOC))
586	continue;
587
588	/*
589	* Relocate the section.
590	*/
591	Log2(("rtldrELF: %s: Relocation records for #%d [%s] (sh_info=%d sh_link=%d) found in #%d [%s] (sh_info=%d sh_link=%d)\n",
592	pszLogName, (int)pShdrRel->sh_info, ELF_STR(pModElf, pShdr->sh_name), (int)pShdr->sh_info, (int)pShdr->sh_link,
593	iShdr, ELF_STR(pModElf, pShdrRel->sh_name), (int)pShdrRel->sh_info, (int)pShdrRel->sh_link));
594
595	/** @todo Make RelocateSection a function pointer so we can select the one corresponding to the machine when opening the image. */
596	rc = RTLDRELF_NAME(RelocateSection)(pModElf, BaseAddr, pfnGetImport, pvUser,
597	pShdr->sh_addr,
598	pShdr->sh_size,
599	(const uint8_t *)pModElf->pvBits + pShdr->sh_offset,
600	(uint8_t *)pvBits + pShdr->sh_addr,
601	(const uint8_t *)pModElf->pvBits + pShdrRel->sh_offset,
602	pShdrRel->sh_size);
603	if (RT_FAILURE(rc))
604	return rc;
605	}
606	return VINF_SUCCESS;
607	}
608
609
610	/** @copydoc RTLDROPS::pfnGetSymbolEx */
611	static DECLCALLBACK(int) RTLDRELF_NAME(GetSymbolEx)(PRTLDRMODINTERNAL pMod, const void pvBits, RTUINTPTR BaseAddress, const char pszSymbol, RTUINTPTR *pValue)
612	{
613	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
614	NOREF(pvBits);
615
616	/*
617	* Validate the input.
618	*/
619	Elf_Addr BaseAddr = (Elf_Addr)BaseAddress;
620	AssertMsgReturn((RTUINTPTR)BaseAddr == BaseAddress, ("#RTptr", BaseAddress), VERR_IMAGE_BASE_TOO_HIGH);
621
622	/*
623	* Map the image bits if not already done and setup pointer into it.
624	*/
625	int rc = RTLDRELF_NAME(MapBits)(pModElf, true);
626	if (RT_FAILURE(rc))
627	return rc;
628
629	/*
630	* Calc all kinds of pointers before we start iterating the symbol table.
631	*/
632	const char *pStr = pModElf->pStr;
633	const Elf_Sym *paSyms = pModElf->paSyms;
634	unsigned cSyms = pModElf->cSyms;
635	for (unsigned iSym = 1; iSym < cSyms; iSym++)
636	{
637	/* Undefined symbols are not exports, they are imports. */
638	if ( paSyms[iSym].st_shndx != SHN_UNDEF
639	&& ( ELF_ST_BIND(paSyms[iSym].st_info) == STB_GLOBAL
640	\|\| ELF_ST_BIND(paSyms[iSym].st_info) == STB_WEAK))
641	{
642	/* Validate the name string and try match with it. */
643	if (paSyms[iSym].st_name < pModElf->cbStr)
644	{
645	if (!strcmp(pszSymbol, pStr + paSyms[iSym].st_name))
646	{
647	/* matched! */
648	Elf_Addr Value;
649	if (paSyms[iSym].st_shndx == SHN_ABS)
650	/* absolute symbols are not subject to any relocation. */
651	Value = paSyms[iSym].st_value;
652	else if (paSyms[iSym].st_shndx < pModElf->Ehdr.e_shnum)
653	/* relative to the section. */
654	Value = BaseAddr + paSyms[iSym].st_value + pModElf->paShdrs[paSyms[iSym].st_shndx].sh_addr;
655	else
656	{
657	AssertMsgFailed(("Arg. paSyms[iSym].st_shndx=%d\n", paSyms[iSym].st_shndx));
658	return VERR_BAD_EXE_FORMAT;
659	}
660	AssertMsgReturn(Value == (RTUINTPTR)Value, (FMT_ELF_ADDR "\n", Value), VERR_SYMBOL_VALUE_TOO_BIG);
661	*pValue = (RTUINTPTR)Value;
662	return VINF_SUCCESS;
663	}
664	}
665	else
666	{
667	AssertMsgFailed(("String outside string table! iSym=%d paSyms[iSym].st_name=%#x\n", iSym, paSyms[iSym].st_name));
668	return VERR_LDRELF_INVALID_SYMBOL_NAME_OFFSET;
669	}
670	}
671	}
672
673	return VERR_SYMBOL_NOT_FOUND;
674	}
675
676
677
678	/**
679	* The ELF module operations.
680	*/
681	static RTLDROPS RTLDRELF_MID(s_rtldrElf,Ops) =
682	{
683	#if ELF_MODE == 32
684	"elf32",
685	#elif ELF_MODE == 64
686	"elf64",
687	#endif
688	RTLDRELF_NAME(Close),
689	NULL, /* Get Symbol */
690	RTLDRELF_NAME(Done),
691	RTLDRELF_NAME(EnumSymbols),
692	/* ext: */
693	RTLDRELF_NAME(GetImageSize),
694	RTLDRELF_NAME(GetBits),
695	RTLDRELF_NAME(Relocate),
696	RTLDRELF_NAME(GetSymbolEx),
697	0
698	};
699
700
701
702	/**
703	* Validates the ELF header.
704	*
705	* @returns iprt status code.
706	* @param pEhdr Pointer to the ELF header.
707	* @param pszLogName The log name.
708	* @param cbRawImage The size of the raw image.
709	*/
710	static int RTLDRELF_NAME(ValidateElfHeader)(const Elf_Ehdr pEhdr, const char pszLogName, uint64_t cbRawImage)
711	{
712	Log3(("RTLdrELF: e_ident: %.*Rhxs\n"
713	"RTLdrELF: e_type: " FMT_ELF_HALF "\n"
714	"RTLdrELF: e_version: " FMT_ELF_HALF "\n"
715	"RTLdrELF: e_entry: " FMT_ELF_ADDR "\n"
716	"RTLdrELF: e_phoff: " FMT_ELF_OFF "\n"
717	"RTLdrELF: e_shoff: " FMT_ELF_OFF "\n"
718	"RTLdrELF: e_flags: " FMT_ELF_WORD "\n"
719	"RTLdrELF: e_ehsize: " FMT_ELF_HALF "\n"
720	"RTLdrELF: e_phentsize: " FMT_ELF_HALF "\n"
721	"RTLdrELF: e_phnum: " FMT_ELF_HALF "\n"
722	"RTLdrELF: e_shentsize: " FMT_ELF_HALF "\n"
723	"RTLdrELF: e_shnum: " FMT_ELF_HALF "\n"
724	"RTLdrELF: e_shstrndx: " FMT_ELF_HALF "\n",
725	ELEMENTS(pEhdr->e_ident), &pEhdr->e_ident[0], pEhdr->e_type, pEhdr->e_version,
726	pEhdr->e_entry, pEhdr->e_phoff, pEhdr->e_shoff,pEhdr->e_flags, pEhdr->e_ehsize, pEhdr->e_phentsize,
727	pEhdr->e_phnum, pEhdr->e_shentsize, pEhdr->e_shnum, pEhdr->e_shstrndx));
728
729	if ( pEhdr->e_ident[EI_MAG0] != ELFMAG0
730	\|\| pEhdr->e_ident[EI_MAG1] != ELFMAG1
731	\|\| pEhdr->e_ident[EI_MAG2] != ELFMAG2
732	\|\| pEhdr->e_ident[EI_MAG3] != ELFMAG3
733	)
734	{
735	Log(("RTLdrELF: %s: Invalid ELF magic (%.*Rhxs)\n", pszLogName, sizeof(pEhdr->e_ident), pEhdr->e_ident));
736	return VERR_BAD_EXE_FORMAT;
737	}
738	if (pEhdr->e_ident[EI_CLASS] != RTLDRELF_SUFF(ELFCLASS))
739	{
740	Log(("RTLdrELF: %s: Invalid ELF class (%.*Rhxs)\n", pszLogName, sizeof(pEhdr->e_ident), pEhdr->e_ident));
741	return VERR_BAD_EXE_FORMAT;
742	}
743	if (pEhdr->e_ident[EI_DATA] != ELFDATA2LSB)
744	{
745	Log(("RTLdrELF: %s: ELF endian %x is unsupported\n", pEhdr->e_ident[EI_DATA]));
746	return VERR_LDRELF_ODD_ENDIAN;
747	}
748	if (pEhdr->e_version != EV_CURRENT)
749	{
750	Log(("RTLdrELF: %s: ELF version %x is unsupported\n", pEhdr->e_version));
751	return VERR_LDRELF_VERSION;
752	}
753
754	if (sizeof(Elf_Ehdr) != pEhdr->e_ehsize)
755	{
756	Log(("RTLdrELF: %s: Elf header e_ehsize is %d expected %d!\n",
757	pszLogName, pEhdr->e_ehsize, sizeof(Elf_Ehdr)));
758	return VERR_BAD_EXE_FORMAT;
759	}
760	if ( sizeof(Elf_Phdr) != pEhdr->e_phentsize
761	&& ( pEhdr->e_phnum != 0
762	\|\| pEhdr->e_type == ET_DYN))
763	{
764	Log(("RTLdrELF: %s: Elf header e_phentsize is %d expected %d!\n",
765	pszLogName, pEhdr->e_phentsize, sizeof(Elf_Phdr)));
766	return VERR_BAD_EXE_FORMAT;
767	}
768	if (sizeof(Elf_Shdr) != pEhdr->e_shentsize)
769	{
770	Log(("RTLdrELF: %s: Elf header e_shentsize is %d expected %d!\n",
771	pszLogName, pEhdr->e_shentsize, sizeof(Elf_Shdr)));
772	return VERR_BAD_EXE_FORMAT;
773	}
774
775	switch (pEhdr->e_type)
776	{
777	case ET_REL:
778	break;
779	case ET_EXEC:
780	Log(("RTLdrELF: %s: Executable images are not supported yet!\n", pszLogName));
781	return VERR_LDRELF_EXEC;
782	case ET_DYN:
783	Log(("RTLdrELF: %s: Dynamic images are not supported yet!\n", pszLogName));
784	return VERR_LDRELF_DYN;
785	default:
786	Log(("RTLdrELF: %s: image type %#x is not supported!\n", pszLogName, pEhdr->e_type));
787	return VERR_BAD_EXE_FORMAT;
788	}
789
790	switch (pEhdr->e_machine)
791	{
792	#if ELF_MODE == 32
793	case EM_386:
794	case EM_486:
795	#elif ELF_MODE == 64
796	case EM_X86_64:
797	#endif
798	break;
799	default:
800	Log(("RTLdrELF: %s: machine type %u is not supported!\n", pEhdr->e_machine));
801	return VERR_LDRELF_MACHINE;
802	}
803
804	if ( pEhdr->e_phoff < pEhdr->e_ehsize
805	&& !(pEhdr->e_phoff && pEhdr->e_phnum)
806	&& pEhdr->e_phnum)
807	{
808	Log(("RTLdrELF: %s: The program headers overlap with the ELF header! e_phoff=" FMT_ELF_OFF "\n",
809	pszLogName, pEhdr->e_phoff));
810	return VERR_BAD_EXE_FORMAT;
811	}
812	if ( pEhdr->e_phoff + pEhdr->e_phnum * pEhdr->e_phentsize > cbRawImage
813	\|\| pEhdr->e_phoff + pEhdr->e_phnum * pEhdr->e_phentsize < pEhdr->e_phoff)
814	{
815	Log(("RTLdrELF: %s: The program headers extends beyond the file! e_phoff=" FMT_ELF_OFF " e_phnum=" FMT_ELF_HALF "\n",
816	pszLogName, pEhdr->e_phoff, pEhdr->e_phnum));
817	return VERR_BAD_EXE_FORMAT;
818	}
819
820
821	if ( pEhdr->e_shoff < pEhdr->e_ehsize
822	&& !(pEhdr->e_shoff && pEhdr->e_shnum))
823	{
824	Log(("RTLdrELF: %s: The section headers overlap with the ELF header! e_shoff=" FMT_ELF_OFF "\n",
825	pszLogName, pEhdr->e_shoff));
826	return VERR_BAD_EXE_FORMAT;
827	}
828	if ( pEhdr->e_shoff + pEhdr->e_shnum * pEhdr->e_shentsize > cbRawImage
829	\|\| pEhdr->e_shoff + pEhdr->e_shnum * pEhdr->e_shentsize < pEhdr->e_shoff)
830	{
831	Log(("RTLdrELF: %s: The section headers extends beyond the file! e_shoff=" FMT_ELF_OFF " e_shnum=" FMT_ELF_HALF "\n",
832	pszLogName, pEhdr->e_shoff, pEhdr->e_shnum));
833	return VERR_BAD_EXE_FORMAT;
834	}
835
836	return VINF_SUCCESS;
837	}
838
839	/**
840	* Gets the section header name.
841	*
842	* @returns pszName.
843	* @param pReader The loader reader instance.
844	* @param pEhdr The elf header.
845	* @param offName The offset of the section header name.
846	* @param pszName Where to store the name.
847	* @param cbName The size of the buffer pointed to by pszName.
848	*/
849	const char RTLDRELF_NAME(GetSHdrName)(PRTLDRMODELF pModElf, Elf_Word offName, char pszName, size_t cbName)
850	{
851	RTFOFF off = pModElf->paShdrs[pModElf->Ehdr.e_shstrndx].sh_offset + offName;
852	int rc = pModElf->pReader->pfnRead(pModElf->pReader, pszName, cbName - 1, off);
853	if (RT_FAILURE(rc))
854	{
855	/* read by for byte. */
856	for (unsigned i = 0; i < cbName; i++, off++)
857	{
858	int rc = pModElf->pReader->pfnRead(pModElf->pReader, pszName + i, 1, off);
859	if (RT_FAILURE(rc))
860	{
861	pszName[i] = '\0';
862	break;
863	}
864	}
865	}
866
867	pszName[cbName - 1] = '\0';
868	return pszName;
869	}
870
871
872	/**
873	* Validates a section header.
874	*
875	* @returns iprt status code.
876	* @param pModElf Pointer to the module structure.
877	* @param iShdr The index of section header which should be validated.
878	* The section headers are found in the pModElf->paShdrs array.
879	* @param pszLogName The log name.
880	* @param cbRawImage The size of the raw image.
881	*/
882	static int RTLDRELF_NAME(ValidateSectionHeader)(PRTLDRMODELF pModElf, unsigned iShdr, const char *pszLogName, RTFOFF cbRawImage)
883	{
884	const Elf_Shdr *pShdr = &pModElf->paShdrs[iShdr];
885	char szSectionName[80]; NOREF(szSectionName);
886	Log3(("RTLdrELF: Section Header #%d:\n"
887	"RTLdrELF: sh_name: " FMT_ELF_WORD " - %s\n"
888	"RTLdrELF: sh_type: " FMT_ELF_WORD " (%s)\n"
889	"RTLdrELF: sh_flags: " FMT_ELF_XWORD "\n"
890	"RTLdrELF: sh_addr: " FMT_ELF_ADDR "\n"
891	"RTLdrELF: sh_offset: " FMT_ELF_OFF "\n"
892	"RTLdrELF: sh_size: " FMT_ELF_XWORD "\n"
893	"RTLdrELF: sh_link: " FMT_ELF_WORD "\n"
894	"RTLdrELF: sh_info: " FMT_ELF_WORD "\n"
895	"RTLdrELF: sh_addralign: " FMT_ELF_XWORD "\n"
896	"RTLdrELF: sh_entsize: " FMT_ELF_XWORD "\n",
897	iShdr,
898	pShdr->sh_name, RTLDRELF_NAME(GetSHdrName)(pModElf, pShdr->sh_name, szSectionName, sizeof(szSectionName)),
899	pShdr->sh_type, rtldrElfGetShdrType(pShdr->sh_type), pShdr->sh_flags, pShdr->sh_addr,
900	pShdr->sh_offset, pShdr->sh_size, pShdr->sh_link, pShdr->sh_info, pShdr->sh_addralign,
901	pShdr->sh_entsize));
902
903	if (pShdr->sh_link >= pModElf->Ehdr.e_shnum)
904	{
905	Log(("RTLdrELF: %s: Shdr #%d: sh_link (%d) is beyond the end of the section table (%d)!\n",
906	pszLogName, iShdr, pShdr->sh_link, pModElf->Ehdr.e_shnum));
907	return VERR_BAD_EXE_FORMAT;
908	}
909
910	switch (pShdr->sh_type)
911	{
912	/** @todo find specs and check up which sh_info fields indicates section table entries */
913	case 12301230:
914	if (pShdr->sh_info >= pModElf->Ehdr.e_shnum)
915	{
916	Log(("RTLdrELF: %s: Shdr #%d: sh_info (%d) is beyond the end of the section table (%d)!\n",
917	pszLogName, iShdr, pShdr->sh_link, pModElf->Ehdr.e_shnum));
918	return VERR_BAD_EXE_FORMAT;
919	}
920	break;
921
922	case SHT_NULL:
923	case SHT_PROGBITS:
924	case SHT_SYMTAB:
925	case SHT_STRTAB:
926	case SHT_RELA:
927	case SHT_HASH:
928	case SHT_DYNAMIC:
929	case SHT_NOTE:
930	case SHT_NOBITS:
931	case SHT_REL:
932	case SHT_SHLIB:
933	case SHT_DYNSYM:
934	/*
935	* For these types sh_info doesn't have any special meaning, or anything which
936	* we need/can validate now.
937	*/
938	break;
939
940
941	default:
942	Log(("RTLdrELF: %s: Warning, unknown type %d!\n", pszLogName, pShdr->sh_type));
943	break;
944	}
945
946	if ( pShdr->sh_type != SHT_NOBITS
947	&& pShdr->sh_size)
948	{
949	RTFOFF offEnd = pShdr->sh_offset + pShdr->sh_size;
950	if ( offEnd > cbRawImage
951	\|\| offEnd < (RTFOFF)pShdr->sh_offset)
952	{
953	Log(("RTLdrELF: %s: Shdr #%d: sh_offset (" FMT_ELF_OFF ") + sh_size (" FMT_ELF_XWORD " = %RTfoff) is beyond the end of the file (%RTfoff)!\n",
954	pszLogName, iShdr, pShdr->sh_offset, pShdr->sh_size, offEnd, cbRawImage));
955	return VERR_BAD_EXE_FORMAT;
956	}
957	if (pShdr->sh_offset < sizeof(Elf_Ehdr))
958	{
959	Log(("RTLdrELF: %s: Shdr #%d: sh_offset (" FMT_ELF_OFF ") + sh_size (" FMT_ELF_XWORD ") is starting in the ELF header!\n",
960	pszLogName, iShdr, pShdr->sh_offset, pShdr->sh_size, cbRawImage));
961	return VERR_BAD_EXE_FORMAT;
962	}
963	}
964
965	return VINF_SUCCESS;
966	}
967
968
969
970	/**
971	* Opens an ELF image, fixed bitness.
972	*
973	* @returns iprt status code.
974	* @param pReader The loader reader instance which will provide the raw image bits.
975	* @param phLdrMod Where to store the handle.
976	*/
977	static int RTLDRELF_NAME(Open)(PRTLDRREADER pReader, PRTLDRMOD phLdrMod)
978	{
979	const char *pszLogName = pReader->pfnLogName(pReader);
980	RTFOFF cbRawImage = pReader->pfnSize(pReader);
981
982	/*
983	* Create the loader module instance.
984	*/
985	PRTLDRMODELF pModElf = (PRTLDRMODELF)RTMemAllocZ(sizeof(*pModElf));
986	if (!pModElf)
987	return VERR_NO_MEMORY;
988
989	pModElf->Core.u32Magic = RTLDRMOD_MAGIC;
990	pModElf->Core.eState = LDR_STATE_INVALID;
991	pModElf->pReader = pReader;
992	//pModElf->pvBits = NULL;
993	//pModElf->Ehdr = {0};
994	//pModElf->paShdrs = NULL;
995	//pModElf->paSyms = NULL;
996	pModElf->iSymSh = ~0U;
997	pModElf->cSyms = 0;
998	pModElf->iStrSh = ~0U;
999	pModElf->cbStr = 0;
1000	pModElf->cbImage = 0;
1001	//pModElf->pStr = NULL;
1002
1003	/*
1004	* Read and validate the ELF header.
1005	*/
1006	int rc = pReader->pfnRead(pReader, &pModElf->Ehdr, sizeof(pModElf->Ehdr), 0);
1007	if (RT_SUCCESS(rc))
1008	rc = RTLDRELF_NAME(ValidateElfHeader)(&pModElf->Ehdr, pszLogName, cbRawImage);
1009	if (RT_SUCCESS(rc))
1010	{
1011	/*
1012	* Read the section headers.
1013	*/
1014	Elf_Shdr paShdrs = (Elf_Shdr )RTMemAlloc(pModElf->Ehdr.e_shnum * sizeof(Elf_Shdr));
1015	if (paShdrs)
1016	{
1017	pModElf->paShdrs = paShdrs;
1018	rc = pReader->pfnRead(pReader, paShdrs, pModElf->Ehdr.e_shnum * sizeof(Elf_Shdr),
1019	pModElf->Ehdr.e_shoff);
1020	if (RT_SUCCESS(rc))
1021	{
1022	/*
1023	* Validate the section headers, allocate memory for the sections (determin the image size),
1024	* and find relevant sections.
1025	*/
1026	for (unsigned i = 0; i < pModElf->Ehdr.e_shnum; i++)
1027	{
1028	rc = RTLDRELF_NAME(ValidateSectionHeader)(pModElf, i, pszLogName, cbRawImage);
1029	if (RT_FAILURE(rc))
1030	break;
1031
1032	/* Allocate memory addresses for the section. */
1033	if (paShdrs[i].sh_flags & SHF_ALLOC)
1034	{
1035	paShdrs[i].sh_addr = paShdrs[i].sh_addralign
1036	? RT_ALIGN_T(pModElf->cbImage, paShdrs[i].sh_addralign, Elf_Addr)
1037	: pModElf->cbImage;
1038	pModElf->cbImage = (size_t)paShdrs[i].sh_addr + (size_t)paShdrs[i].sh_size;
1039	AssertMsgReturn(pModElf->cbImage == paShdrs[i].sh_addr + paShdrs[i].sh_size,
1040	(FMT_ELF_ADDR "\n", paShdrs[i].sh_addr + paShdrs[i].sh_size),
1041	VERR_IMAGE_TOO_BIG);
1042	Log2(("RTLdrElf: %s: Assigned " FMT_ELF_ADDR " to section #%d\n", pszLogName, paShdrs[i].sh_addr, i));
1043	}
1044
1045	/* We're looking for symbol tables. */
1046	if (paShdrs[i].sh_type == SHT_SYMTAB)
1047	{
1048	if (pModElf->iSymSh != ~0U)
1049	{
1050	Log(("RTLdrElf: %s: Multiple symbol tabs! iSymSh=%d i=%d\n", pszLogName, pModElf->iSymSh, i));
1051	rc = VERR_LDRELF_MULTIPLE_SYMTABS;
1052	break;
1053	}
1054	pModElf->iSymSh = i;
1055	pModElf->cSyms = (unsigned)(paShdrs[i].sh_size / sizeof(Elf_Sym));
1056	AssertReturn(pModElf->cSyms == paShdrs[i].sh_size / sizeof(Elf_Sym), VERR_IMAGE_TOO_BIG);
1057	pModElf->iStrSh = paShdrs[i].sh_link;
1058	pModElf->cbStr = (unsigned)paShdrs[pModElf->iStrSh].sh_size;
1059	AssertReturn(pModElf->cbStr == paShdrs[pModElf->iStrSh].sh_size, VERR_IMAGE_TOO_BIG);
1060	}
1061	} /* for each section header */
1062
1063	Log2(("RTLdrElf: iSymSh=%u cSyms=%u iStrSh=%u cbStr=%u rc=%Rrc cbImage=%#zx\n",
1064	pModElf->iSymSh, pModElf->cSyms, pModElf->iStrSh, pModElf->cbStr, rc, pModElf->cbImage));
1065
1066	/*
1067	* Are the section headers fine?
1068	* We require there to be symbol & string tables (at least for the time being).
1069	*/
1070	if ( pModElf->iSymSh == ~0U
1071	\|\| pModElf->iStrSh == ~0U)
1072	rc = VERR_LDRELF_NO_SYMBOL_OR_NO_STRING_TABS;
1073	if (RT_SUCCESS(rc))
1074	{
1075	pModElf->Core.pOps = &RTLDRELF_MID(s_rtldrElf,Ops);
1076	pModElf->Core.eState = LDR_STATE_OPENED;
1077	*phLdrMod = &pModElf->Core;
1078
1079	LogFlow(("%s: %s: returns VINF_SUCCESS phLdrMod=%p\n", __FUNCTION__, pszLogName, phLdrMod));
1080	return VINF_SUCCESS;
1081	}
1082	}
1083
1084	RTMemFree(paShdrs);
1085	}
1086	else
1087	rc = VERR_NO_MEMORY;
1088	}
1089
1090	RTMemFree(pModElf);
1091	LogFlow(("%s: returns %Rrc\n", __FUNCTION__, rc));
1092	return rc;
1093	}
1094
1095
1096
1097
1098	/*******************************************************************************
1099	* Cleanup Constants And Macros *
1100	*******************************************************************************/
1101	#undef RTLDRELF_NAME
1102	#undef RTLDRELF_SUFF
1103	#undef RTLDRELF_MID
1104
1105	#undef FMT_ELF_ADDR
1106	#undef FMT_ELF_HALF
1107	#undef FMT_ELF_SHALF
1108	#undef FMT_ELF_OFF
1109	#undef FMT_ELF_SIZE
1110	#undef FMT_ELF_SWORD
1111	#undef FMT_ELF_WORD
1112	#undef FMT_ELF_XWORD
1113	#undef FMT_ELF_SXWORD
1114
1115	#undef Elf_Ehdr
1116	#undef Elf_Phdr
1117	#undef Elf_Shdr
1118	#undef Elf_Sym
1119	#undef Elf_Rel
1120	#undef Elf_Rela
1121	#undef Elf_Reloc
1122	#undef Elf_Nhdr
1123	#undef Elf_Dyn
1124
1125	#undef Elf_Addr
1126	#undef Elf_Half
1127	#undef Elf_Off
1128	#undef Elf_Size
1129	#undef Elf_Sword
1130	#undef Elf_Word
1131
1132	#undef RTLDRMODELF
1133	#undef PRTLDRMODELF
1134
1135	#undef ELF_R_SYM
1136	#undef ELF_R_TYPE
1137	#undef ELF_R_INFO
1138
1139	#undef ELF_ST_BIND
1140

Note: See TracBrowser for help on using the repository browser.

source: vbox/trunk/src/VBox/Runtime/ldrELFRelocatable.cpp.h@ 4968

Download in other formats: