ldrELFRelocatable.cpp.h@ 80346

Last change on this file since 80346 was 77971, checked in by vboxsync, 6 years ago
Runtime/ldr: Make RTLDRREADER::pfnSize return an unsigned 64bit value instead of a signed one for the raw image size and adapt all users. This avoids signed/unsigned confusions when comparing those value with others (bugref:9188)
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1	/* $Id: ldrELFRelocatable.cpp.h 77971 2019-04-01 09:35:17Z vboxsync $ */
2	/** @file
3	* IPRT - Binary Image Loader, Template for ELF Relocatable Images.
4	*/
5
6	/*
7	* Copyright (C) 2006-2019 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	* Defined Constants And Macros *
30	*******************************************************************************/
31	#if ELF_MODE == 32
32	#define RTLDRELF_NAME(name) rtldrELF32##name
33	#define RTLDRELF_SUFF(name) name##32
34	#define RTLDRELF_MID(pre,suff) pre##32##suff
35	#define FMT_ELF_ADDR "%08RX32"
36	#define FMT_ELF_HALF "%04RX16"
37	#define FMT_ELF_OFF "%08RX32"
38	#define FMT_ELF_SIZE "%08RX32"
39	#define FMT_ELF_SWORD "%RI32"
40	#define FMT_ELF_WORD "%08RX32"
41	#define FMT_ELF_XWORD "%08RX32"
42	#define FMT_ELF_SXWORD "%RI32"
43
44	#elif ELF_MODE == 64
45	#define RTLDRELF_NAME(name) rtldrELF64##name
46	#define RTLDRELF_SUFF(name) name##64
47	#define RTLDRELF_MID(pre,suff) pre##64##suff
48	#define FMT_ELF_ADDR "%016RX64"
49	#define FMT_ELF_HALF "%04RX16"
50	#define FMT_ELF_SHALF "%RI16"
51	#define FMT_ELF_OFF "%016RX64"
52	#define FMT_ELF_SIZE "%016RX64"
53	#define FMT_ELF_SWORD "%RI32"
54	#define FMT_ELF_WORD "%08RX32"
55	#define FMT_ELF_XWORD "%016RX64"
56	#define FMT_ELF_SXWORD "%RI64"
57	#endif
58
59	#define Elf_Ehdr RTLDRELF_MID(Elf,_Ehdr)
60	#define Elf_Phdr RTLDRELF_MID(Elf,_Phdr)
61	#define Elf_Shdr RTLDRELF_MID(Elf,_Shdr)
62	#define Elf_Sym RTLDRELF_MID(Elf,_Sym)
63	#define Elf_Rel RTLDRELF_MID(Elf,_Rel)
64	#define Elf_Rela RTLDRELF_MID(Elf,_Rela)
65	#define Elf_Nhdr RTLDRELF_MID(Elf,_Nhdr)
66	#define Elf_Dyn RTLDRELF_MID(Elf,_Dyn)
67	#define Elf_Addr RTLDRELF_MID(Elf,_Addr)
68	#define Elf_Half RTLDRELF_MID(Elf,_Half)
69	#define Elf_Off RTLDRELF_MID(Elf,_Off)
70	#define Elf_Size RTLDRELF_MID(Elf,_Size)
71	#define Elf_Sword RTLDRELF_MID(Elf,_Sword)
72	#define Elf_Word RTLDRELF_MID(Elf,_Word)
73
74	#define RTLDRMODELF RTLDRELF_MID(RTLDRMODELF,RT_NOTHING)
75	#define PRTLDRMODELF RTLDRELF_MID(PRTLDRMODELF,RT_NOTHING)
76
77	#define ELF_R_SYM(info) RTLDRELF_MID(ELF,_R_SYM)(info)
78	#define ELF_R_TYPE(info) RTLDRELF_MID(ELF,_R_TYPE)(info)
79	#define ELF_R_INFO(sym, type) RTLDRELF_MID(ELF,_R_INFO)(sym, type)
80
81	#define ELF_ST_BIND(info) RTLDRELF_MID(ELF,_ST_BIND)(info)
82
83
84
85	/*******************************************************************************
86	* Structures and Typedefs *
87	*******************************************************************************/
88	/**
89	* The ELF loader structure.
90	*/
91	typedef struct RTLDRMODELF
92	{
93	/** Core module structure. */
94	RTLDRMODINTERNAL Core;
95	/** Pointer to readonly mapping of the image bits.
96	* This mapping is provided by the pReader. */
97	const void *pvBits;
98
99	/** The ELF header. */
100	Elf_Ehdr Ehdr;
101	/** Pointer to our copy of the section headers with sh_addr as RVAs.
102	* The virtual addresses in this array is the 0 based assignments we've given the image.
103	* Not valid if the image is DONE. */
104	Elf_Shdr *paShdrs;
105	/** Unmodified section headers (allocated after paShdrs, so no need to free).
106	* Not valid if the image is DONE. */
107	Elf_Shdr const *paOrgShdrs;
108	/** The size of the loaded image. */
109	size_t cbImage;
110
111	/** The image base address if it's an EXEC or DYN image. */
112	Elf_Addr LinkAddress;
113
114	/** The symbol section index. */
115	unsigned iSymSh;
116	/** Number of symbols in the table. */
117	unsigned cSyms;
118	/** Pointer to symbol table within RTLDRMODELF::pvBits. */
119	const Elf_Sym *paSyms;
120
121	/** The string section index. */
122	unsigned iStrSh;
123	/** Size of the string table. */
124	unsigned cbStr;
125	/** Pointer to string table within RTLDRMODELF::pvBits. */
126	const char *pStr;
127
128	/** Size of the section header string table. */
129	unsigned cbShStr;
130	/** Pointer to section header string table within RTLDRMODELF::pvBits. */
131	const char *pShStr;
132
133	/** The '.eh_frame' section index. Zero if not searched for, ~0U if not found. */
134	unsigned iShEhFrame;
135	/** The '.eh_frame_hdr' section index. Zero if not searched for, ~0U if not found. */
136	unsigned iShEhFrameHdr;
137	} RTLDRMODELF, *PRTLDRMODELF;
138
139
140	/**
141	* Maps the image bits into memory and resolve pointers into it.
142	*
143	* @returns iprt status code.
144	* @param pModElf The ELF loader module instance data.
145	* @param fNeedsBits Set if we actually need the pvBits member.
146	* If we don't, we can simply read the string and symbol sections, thus saving memory.
147	*/
148	static int RTLDRELF_NAME(MapBits)(PRTLDRMODELF pModElf, bool fNeedsBits)
149	{
150	NOREF(fNeedsBits);
151	if (pModElf->pvBits)
152	return VINF_SUCCESS;
153	int rc = pModElf->Core.pReader->pfnMap(pModElf->Core.pReader, &pModElf->pvBits);
154	if (RT_SUCCESS(rc))
155	{
156	const uint8_t pu8 = (const uint8_t )pModElf->pvBits;
157	if (pModElf->iSymSh != ~0U)
158	pModElf->paSyms = (const Elf_Sym *)(pu8 + pModElf->paShdrs[pModElf->iSymSh].sh_offset);
159	if (pModElf->iStrSh != ~0U)
160	pModElf->pStr = (const char *)(pu8 + pModElf->paShdrs[pModElf->iStrSh].sh_offset);
161	pModElf->pShStr = (const char *)(pu8 + pModElf->paShdrs[pModElf->Ehdr.e_shstrndx].sh_offset);
162
163	/*
164	* Verify that the ends of the string tables have a zero terminator
165	* (this avoids duplicating the appropriate checks later in the code accessing the string tables).
166	*
167	* sh_offset and sh_size were verfied in RTLDRELF_NAME(ValidateSectionHeader)() already so they
168	* are safe to use.
169	*/
170	AssertMsgStmt( pModElf->iStrSh == ~0U
171	\|\| pModElf->pStr[pModElf->paShdrs[pModElf->iStrSh].sh_size - 1] == '\0',
172	("The string table is not zero terminated!\n"),
173	rc = VERR_LDRELF_UNTERMINATED_STRING_TAB);
174	AssertMsgStmt(pModElf->pShStr[pModElf->paShdrs[pModElf->Ehdr.e_shstrndx].sh_size - 1] == '\0',
175	("The section header string table is not zero terminated!\n"),
176	rc = VERR_LDRELF_UNTERMINATED_STRING_TAB);
177
178	if (RT_FAILURE(rc))
179	{
180	/* Unmap. */
181	int rc2 = pModElf->Core.pReader->pfnUnmap(pModElf->Core.pReader, pModElf->pvBits);
182	AssertRC(rc2);
183	pModElf->pvBits = NULL;
184	pModElf->paSyms = NULL;
185	pModElf->pStr = NULL;
186	pModElf->pShStr = NULL;
187	}
188	}
189	return rc;
190	}
191
192
193	/*
194	*
195	* EXEC & DYN.
196	* EXEC & DYN.
197	* EXEC & DYN.
198	* EXEC & DYN.
199	* EXEC & DYN.
200	*
201	*/
202
203
204	/**
205	* Applies the fixups for a section in an executable image.
206	*
207	* @returns iprt status code.
208	* @param pModElf The ELF loader module instance data.
209	* @param BaseAddr The base address which the module is being fixedup to.
210	* @param pfnGetImport The callback function to use to resolve imports (aka unresolved externals).
211	* @param pvUser User argument to pass to the callback.
212	* @param SecAddr The section address. This is the address the relocations are relative to.
213	* @param cbSec The section size. The relocations must be inside this.
214	* @param pu8SecBaseR Where we read section bits from.
215	* @param pu8SecBaseW Where we write section bits to.
216	* @param pvRelocs Pointer to where we read the relocations from.
217	* @param cbRelocs Size of the relocations.
218	*/
219	static int RTLDRELF_NAME(RelocateSectionExecDyn)(PRTLDRMODELF pModElf, Elf_Addr BaseAddr,
220	PFNRTLDRIMPORT pfnGetImport, void *pvUser,
221	const Elf_Addr SecAddr, Elf_Size cbSec,
222	const uint8_t pu8SecBaseR, uint8_t pu8SecBaseW,
223	const void *pvRelocs, Elf_Size cbRelocs)
224	{
225	#if ELF_MODE != 32
226	NOREF(pu8SecBaseR);
227	#endif
228
229	/*
230	* Iterate the relocations.
231	* The relocations are stored in an array of Elf32_Rel records and covers the entire relocation section.
232	*/
233	const Elf_Addr offDelta = BaseAddr - pModElf->LinkAddress;
234	const Elf_Reloc paRels = (const Elf_Reloc )pvRelocs;
235	const unsigned iRelMax = (unsigned)(cbRelocs / sizeof(paRels[0]));
236	AssertMsgReturn(iRelMax == cbRelocs / sizeof(paRels[0]), (FMT_ELF_SIZE "\n", cbRelocs / sizeof(paRels[0])),
237	VERR_IMAGE_TOO_BIG);
238	for (unsigned iRel = 0; iRel < iRelMax; iRel++)
239	{
240	/*
241	* Skip R_XXX_NONE entries early to avoid confusion in the symbol
242	* getter code.
243	*/
244	#if ELF_MODE == 32
245	if (ELF_R_TYPE(paRels[iRel].r_info) == R_386_NONE)
246	continue;
247	#elif ELF_MODE == 64
248	if (ELF_R_TYPE(paRels[iRel].r_info) == R_X86_64_NONE)
249	continue;
250	#endif
251
252	/*
253	* Validate and find the symbol, resolve undefined ones.
254	*/
255	Elf_Size iSym = ELF_R_SYM(paRels[iRel].r_info);
256	if (iSym >= pModElf->cSyms)
257	{
258	AssertMsgFailed(("iSym=%d is an invalid symbol index!\n", iSym));
259	return VERR_LDRELF_INVALID_SYMBOL_INDEX;
260	}
261	const Elf_Sym *pSym = &pModElf->paSyms[iSym];
262	if (pSym->st_name >= pModElf->cbStr)
263	{
264	AssertMsgFailed(("iSym=%d st_name=%d str sh_size=%d\n", iSym, pSym->st_name, pModElf->cbStr));
265	return VERR_LDRELF_INVALID_SYMBOL_NAME_OFFSET;
266	}
267
268	Elf_Addr SymValue = 0;
269	if (pSym->st_shndx == SHN_UNDEF)
270	{
271	/* Try to resolve the symbol. */
272	const char *pszName = ELF_STR(pModElf, pSym->st_name);
273	RTUINTPTR ExtValue;
274	int rc = pfnGetImport(&pModElf->Core, "", pszName, ~0U, &ExtValue, pvUser);
275	AssertMsgRCReturn(rc, ("Failed to resolve '%s' rc=%Rrc\n", pszName, rc), rc);
276	SymValue = (Elf_Addr)ExtValue;
277	AssertMsgReturn((RTUINTPTR)SymValue == ExtValue, ("Symbol value overflowed! '%s'\n", pszName),
278	VERR_SYMBOL_VALUE_TOO_BIG);
279	Log2(("rtldrELF: #%-3d - UNDEF " FMT_ELF_ADDR " '%s'\n", iSym, SymValue, pszName));
280	}
281	else
282	{
283	AssertMsgReturn(pSym->st_shndx < pModElf->Ehdr.e_shnum \|\| pSym->st_shndx == SHN_ABS, ("%#x\n", pSym->st_shndx),
284	VERR_LDRELF_INVALID_RELOCATION_OFFSET);
285	#if ELF_MODE == 64
286	SymValue = pSym->st_value;
287	#endif
288	}
289
290	#if ELF_MODE == 64
291	/* Calc the value (indexes checked above; assumes SHN_UNDEF == 0). */
292	Elf_Addr Value;
293	if (pSym->st_shndx < pModElf->Ehdr.e_shnum)
294	Value = SymValue + offDelta;
295	else /* SHN_ABS: */
296	Value = SymValue + paRels[iRel].r_addend;
297	#endif
298
299	/*
300	* Apply the fixup.
301	*/
302	AssertMsgReturn(paRels[iRel].r_offset < cbSec, (FMT_ELF_ADDR " " FMT_ELF_SIZE "\n", paRels[iRel].r_offset, cbSec), VERR_LDRELF_INVALID_RELOCATION_OFFSET);
303	#if ELF_MODE == 32
304	const Elf_Addr pAddrR = (const Elf_Addr )(pu8SecBaseR + paRels[iRel].r_offset); /* Where to read the addend. */
305	#endif
306	Elf_Addr pAddrW = (Elf_Addr )(pu8SecBaseW + paRels[iRel].r_offset); /* Where to write the fixup. */
307	switch (ELF_R_TYPE(paRels[iRel].r_info))
308	{
309	#if ELF_MODE == 32
310	/*
311	* Absolute addressing.
312	*/
313	case R_386_32:
314	{
315	Elf_Addr Value;
316	if (pSym->st_shndx < pModElf->Ehdr.e_shnum)
317	Value = pAddrR + offDelta; / Simplified. */
318	else if (pSym->st_shndx == SHN_ABS)
319	continue; /* Internal fixup, no need to apply it. */
320	else if (pSym->st_shndx == SHN_UNDEF)
321	Value = SymValue + *pAddrR;
322	else
323	AssertFailedReturn(VERR_LDR_GENERAL_FAILURE); /** @todo SHN_COMMON */
324	(uint32_t )pAddrW = Value;
325	Log4((FMT_ELF_ADDR": R_386_32 Value=" FMT_ELF_ADDR "\n", SecAddr + paRels[iRel].r_offset + BaseAddr, Value));
326	break;
327	}
328
329	/*
330	* PC relative addressing.
331	*/
332	case R_386_PC32:
333	{
334	Elf_Addr Value;
335	if (pSym->st_shndx < pModElf->Ehdr.e_shnum)
336	continue; /* Internal fixup, no need to apply it. */
337	else if (pSym->st_shndx == SHN_ABS)
338	Value = pAddrR + offDelta; / Simplified. */
339	else if (pSym->st_shndx == SHN_UNDEF)
340	{
341	const Elf_Addr SourceAddr = SecAddr + paRels[iRel].r_offset + BaseAddr; /* Where the source really is. */
342	Value = SymValue + (uint32_t )pAddrR - SourceAddr;
343	(uint32_t )pAddrW = Value;
344	}
345	else
346	AssertFailedReturn(VERR_LDR_GENERAL_FAILURE); /** @todo SHN_COMMON */
347	Log4((FMT_ELF_ADDR": R_386_PC32 Value=" FMT_ELF_ADDR "\n", SecAddr + paRels[iRel].r_offset + BaseAddr, Value));
348	break;
349	}
350
351	#elif ELF_MODE == 64
352
353	/*
354	* Absolute addressing
355	*/
356	case R_X86_64_64:
357	{
358	(uint64_t )pAddrW = Value;
359	Log4((FMT_ELF_ADDR": R_X86_64_64 Value=" FMT_ELF_ADDR " SymValue=" FMT_ELF_ADDR "\n",
360	SecAddr + paRels[iRel].r_offset + BaseAddr, Value, SymValue));
361	break;
362	}
363
364	/*
365	* Truncated 32-bit value (zero-extendedable to the 64-bit value).
366	*/
367	case R_X86_64_32:
368	{
369	(uint32_t )pAddrW = (uint32_t)Value;
370	Log4((FMT_ELF_ADDR": R_X86_64_32 Value=" FMT_ELF_ADDR " SymValue=" FMT_ELF_ADDR "\n",
371	SecAddr + paRels[iRel].r_offset + BaseAddr, Value, SymValue));
372	AssertMsgReturn((Elf_Addr)(uint32_t )pAddrW == SymValue, ("Value=" FMT_ELF_ADDR "\n", SymValue),
373	VERR_SYMBOL_VALUE_TOO_BIG);
374	break;
375	}
376
377	/*
378	* Truncated 32-bit value (sign-extendedable to the 64-bit value).
379	*/
380	case R_X86_64_32S:
381	{
382	(int32_t )pAddrW = (int32_t)Value;
383	Log4((FMT_ELF_ADDR": R_X86_64_32S Value=" FMT_ELF_ADDR " SymValue=" FMT_ELF_ADDR "\n",
384	SecAddr + paRels[iRel].r_offset + BaseAddr, Value, SymValue));
385	AssertMsgReturn((Elf_Addr)(int32_t )pAddrW == Value, ("Value=" FMT_ELF_ADDR "\n", Value), VERR_SYMBOL_VALUE_TOO_BIG); /** @todo check the sign-extending here. */
386	break;
387	}
388
389	/*
390	* PC relative addressing.
391	*/
392	case R_X86_64_PC32:
393	case R_X86_64_PLT32: /* binutils commit 451875b4f976a527395e9303224c7881b65e12ed feature/regression. */
394	{
395	const Elf_Addr SourceAddr = SecAddr + paRels[iRel].r_offset + BaseAddr; /* Where the source really is. */
396	Value -= SourceAddr;
397	(int32_t )pAddrW = (int32_t)Value;
398	Log4((FMT_ELF_ADDR": R_X86_64_PC32 Value=" FMT_ELF_ADDR " SymValue=" FMT_ELF_ADDR "\n",
399	SourceAddr, Value, SymValue));
400	AssertMsgReturn((Elf_Addr)(int32_t )pAddrW == Value, ("Value=" FMT_ELF_ADDR "\n", Value), VERR_SYMBOL_VALUE_TOO_BIG); /** @todo check the sign-extending here. */
401	break;
402	}
403	#endif
404
405	default:
406	AssertMsgFailed(("Unknown relocation type: %d (iRel=%d iRelMax=%d)\n",
407	ELF_R_TYPE(paRels[iRel].r_info), iRel, iRelMax));
408	return VERR_LDRELF_RELOCATION_NOT_SUPPORTED;
409	}
410	}
411
412	return VINF_SUCCESS;
413	}
414
415
416
417	/*
418	*
419	* REL
420	* REL
421	* REL
422	* REL
423	* REL
424	*
425	*/
426
427	/**
428	* Get the symbol and symbol value.
429	*
430	* @returns iprt status code.
431	* @param pModElf The ELF loader module instance data.
432	* @param BaseAddr The base address which the module is being fixedup to.
433	* @param pfnGetImport The callback function to use to resolve imports (aka unresolved externals).
434	* @param pvUser User argument to pass to the callback.
435	* @param iSym The symbol to get.
436	* @param ppSym Where to store the symbol pointer on success. (read only)
437	* @param pSymValue Where to store the symbol value on success.
438	*/
439	static int RTLDRELF_NAME(Symbol)(PRTLDRMODELF pModElf, Elf_Addr BaseAddr, PFNRTLDRIMPORT pfnGetImport, void *pvUser,
440	Elf_Size iSym, const Elf_Sym *ppSym, Elf_Addr pSymValue)
441	{
442	/*
443	* Validate and find the symbol.
444	*/
445	if (iSym >= pModElf->cSyms)
446	{
447	AssertMsgFailed(("iSym=%d is an invalid symbol index!\n", iSym));
448	return VERR_LDRELF_INVALID_SYMBOL_INDEX;
449	}
450	const Elf_Sym *pSym = &pModElf->paSyms[iSym];
451	*ppSym = pSym;
452
453	if (pSym->st_name >= pModElf->cbStr)
454	{
455	AssertMsgFailed(("iSym=%d st_name=%d str sh_size=%d\n", iSym, pSym->st_name, pModElf->cbStr));
456	return VERR_LDRELF_INVALID_SYMBOL_NAME_OFFSET;
457	}
458	const char *pszName = ELF_STR(pModElf, pSym->st_name);
459
460	/*
461	* Determine the symbol value.
462	*
463	* Symbols needs different treatment depending on which section their are in.
464	* Undefined and absolute symbols goes into special non-existing sections.
465	*/
466	switch (pSym->st_shndx)
467	{
468	/*
469	* Undefined symbol, needs resolving.
470	*
471	* Since ELF has no generic concept of importing from specific module (the OS/2 ELF format
472	* has but that's a OS extension and only applies to programs and dlls), we'll have to ask
473	* the resolver callback to do a global search.
474	*/
475	case SHN_UNDEF:
476	{
477	/* Try to resolve the symbol. */
478	RTUINTPTR Value;
479	int rc = pfnGetImport(&pModElf->Core, "", pszName, ~0U, &Value, pvUser);
480	if (RT_FAILURE(rc))
481	{
482	AssertMsgFailed(("Failed to resolve '%s' rc=%Rrc\n", pszName, rc));
483	return rc;
484	}
485	*pSymValue = (Elf_Addr)Value;
486	if ((RTUINTPTR)*pSymValue != Value)
487	{
488	AssertMsgFailed(("Symbol value overflowed! '%s'\n", pszName));
489	return VERR_SYMBOL_VALUE_TOO_BIG;
490	}
491
492	Log2(("rtldrELF: #%-3d - UNDEF " FMT_ELF_ADDR " '%s'\n", iSym, *pSymValue, pszName));
493	break;
494	}
495
496	/*
497	* Absolute symbols needs no fixing since they are, well, absolute.
498	*/
499	case SHN_ABS:
500	*pSymValue = pSym->st_value;
501	Log2(("rtldrELF: #%-3d - ABS " FMT_ELF_ADDR " '%s'\n", iSym, *pSymValue, pszName));
502	break;
503
504	/*
505	* All other symbols are addressed relative to their section and need to be fixed up.
506	*/
507	default:
508	if (pSym->st_shndx >= pModElf->Ehdr.e_shnum)
509	{
510	/* what about common symbols? */
511	AssertMsg(pSym->st_shndx < pModElf->Ehdr.e_shnum,
512	("iSym=%d st_shndx=%d e_shnum=%d pszName=%s\n", iSym, pSym->st_shndx, pModElf->Ehdr.e_shnum, pszName));
513	return VERR_BAD_EXE_FORMAT;
514	}
515	*pSymValue = pSym->st_value + pModElf->paShdrs[pSym->st_shndx].sh_addr + BaseAddr;
516	Log2(("rtldrELF: #%-3d - %5d " FMT_ELF_ADDR " '%s'\n", iSym, pSym->st_shndx, *pSymValue, pszName));
517	break;
518	}
519
520	return VINF_SUCCESS;
521	}
522
523
524	/**
525	* Applies the fixups for a sections.
526	*
527	* @returns iprt status code.
528	* @param pModElf The ELF loader module instance data.
529	* @param BaseAddr The base address which the module is being fixedup to.
530	* @param pfnGetImport The callback function to use to resolve imports (aka unresolved externals).
531	* @param pvUser User argument to pass to the callback.
532	* @param SecAddr The section address. This is the address the relocations are relative to.
533	* @param cbSec The section size. The relocations must be inside this.
534	* @param pu8SecBaseR Where we read section bits from.
535	* @param pu8SecBaseW Where we write section bits to.
536	* @param pvRelocs Pointer to where we read the relocations from.
537	* @param cbRelocs Size of the relocations.
538	*/
539	static int RTLDRELF_NAME(RelocateSection)(PRTLDRMODELF pModElf, Elf_Addr BaseAddr, PFNRTLDRIMPORT pfnGetImport, void *pvUser,
540	const Elf_Addr SecAddr, Elf_Size cbSec, const uint8_t pu8SecBaseR, uint8_t pu8SecBaseW,
541	const void *pvRelocs, Elf_Size cbRelocs)
542	{
543	#if ELF_MODE != 32
544	NOREF(pu8SecBaseR);
545	#endif
546
547	/*
548	* Iterate the relocations.
549	* The relocations are stored in an array of Elf32_Rel records and covers the entire relocation section.
550	*/
551	const Elf_Reloc paRels = (const Elf_Reloc )pvRelocs;
552	const unsigned iRelMax = (unsigned)(cbRelocs / sizeof(paRels[0]));
553	AssertMsgReturn(iRelMax == cbRelocs / sizeof(paRels[0]), (FMT_ELF_SIZE "\n", cbRelocs / sizeof(paRels[0])), VERR_IMAGE_TOO_BIG);
554	for (unsigned iRel = 0; iRel < iRelMax; iRel++)
555	{
556	/*
557	* Skip R_XXX_NONE entries early to avoid confusion in the symbol
558	* getter code.
559	*/
560	#if ELF_MODE == 32
561	if (ELF_R_TYPE(paRels[iRel].r_info) == R_386_NONE)
562	continue;
563	#elif ELF_MODE == 64
564	if (ELF_R_TYPE(paRels[iRel].r_info) == R_X86_64_NONE)
565	continue;
566	#endif
567
568
569	/*
570	* Get the symbol.
571	*/
572	const Elf_Sym pSym = NULL; / shut up gcc */
573	Elf_Addr SymValue = 0; /* shut up gcc-4 */
574	int rc = RTLDRELF_NAME(Symbol)(pModElf, BaseAddr, pfnGetImport, pvUser, ELF_R_SYM(paRels[iRel].r_info), &pSym, &SymValue);
575	if (RT_FAILURE(rc))
576	return rc;
577
578	Log3(("rtldrELF: " FMT_ELF_ADDR " %02x %06x - " FMT_ELF_ADDR " %3d %02x %s\n",
579	paRels[iRel].r_offset, ELF_R_TYPE(paRels[iRel].r_info), (unsigned)ELF_R_SYM(paRels[iRel].r_info),
580	SymValue, (unsigned)pSym->st_shndx, pSym->st_info, ELF_STR(pModElf, pSym->st_name)));
581
582	/*
583	* Apply the fixup.
584	*/
585	AssertMsgReturn(paRels[iRel].r_offset < cbSec, (FMT_ELF_ADDR " " FMT_ELF_SIZE "\n", paRels[iRel].r_offset, cbSec), VERR_LDRELF_INVALID_RELOCATION_OFFSET);
586	#if ELF_MODE == 32
587	const Elf_Addr pAddrR = (const Elf_Addr )(pu8SecBaseR + paRels[iRel].r_offset); /* Where to read the addend. */
588	#endif
589	Elf_Addr pAddrW = (Elf_Addr )(pu8SecBaseW + paRels[iRel].r_offset); /* Where to write the fixup. */
590	switch (ELF_R_TYPE(paRels[iRel].r_info))
591	{
592	#if ELF_MODE == 32
593	/*
594	* Absolute addressing.
595	*/
596	case R_386_32:
597	{
598	const Elf_Addr Value = SymValue + *pAddrR;
599	(uint32_t )pAddrW = Value;
600	Log4((FMT_ELF_ADDR": R_386_32 Value=" FMT_ELF_ADDR " SymValue=" FMT_ELF_ADDR "\n",
601	SecAddr + paRels[iRel].r_offset + BaseAddr, Value, SymValue));
602	break;
603	}
604
605	/*
606	* PC relative addressing.
607	*/
608	case R_386_PC32:
609	{
610	const Elf_Addr SourceAddr = SecAddr + paRels[iRel].r_offset + BaseAddr; /* Where the source really is. */
611	const Elf_Addr Value = SymValue + (uint32_t )pAddrR - SourceAddr;
612	(uint32_t )pAddrW = Value;
613	Log4((FMT_ELF_ADDR": R_386_PC32 Value=" FMT_ELF_ADDR " SymValue=" FMT_ELF_ADDR "\n",
614	SourceAddr, Value, SymValue));
615	break;
616	}
617
618	/* ignore */
619	case R_386_NONE:
620	break;
621
622	#elif ELF_MODE == 64
623
624	/*
625	* Absolute addressing
626	*/
627	case R_X86_64_64:
628	{
629	const Elf_Addr Value = SymValue + paRels[iRel].r_addend;
630	(uint64_t )pAddrW = Value;
631	Log4((FMT_ELF_ADDR": R_X86_64_64 Value=" FMT_ELF_ADDR " SymValue=" FMT_ELF_ADDR "\n",
632	SecAddr + paRels[iRel].r_offset + BaseAddr, Value, SymValue));
633	break;
634	}
635
636	/*
637	* Truncated 32-bit value (zero-extendedable to the 64-bit value).
638	*/
639	case R_X86_64_32:
640	{
641	const Elf_Addr Value = SymValue + paRels[iRel].r_addend;
642	(uint32_t )pAddrW = (uint32_t)Value;
643	Log4((FMT_ELF_ADDR": R_X86_64_32 Value=" FMT_ELF_ADDR " SymValue=" FMT_ELF_ADDR "\n",
644	SecAddr + paRels[iRel].r_offset + BaseAddr, Value, SymValue));
645	AssertMsgReturn((Elf_Addr)(uint32_t )pAddrW == Value, ("Value=" FMT_ELF_ADDR "\n", Value), VERR_SYMBOL_VALUE_TOO_BIG);
646	break;
647	}
648
649	/*
650	* Truncated 32-bit value (sign-extendedable to the 64-bit value).
651	*/
652	case R_X86_64_32S:
653	{
654	const Elf_Addr Value = SymValue + paRels[iRel].r_addend;
655	(int32_t )pAddrW = (int32_t)Value;
656	Log4((FMT_ELF_ADDR": R_X86_64_32S Value=" FMT_ELF_ADDR " SymValue=" FMT_ELF_ADDR "\n",
657	SecAddr + paRels[iRel].r_offset + BaseAddr, Value, SymValue));
658	AssertMsgReturn((Elf_Addr)(int32_t )pAddrW == Value, ("Value=" FMT_ELF_ADDR "\n", Value), VERR_SYMBOL_VALUE_TOO_BIG); /** @todo check the sign-extending here. */
659	break;
660	}
661
662	/*
663	* PC relative addressing.
664	*/
665	case R_X86_64_PC32:
666	case R_X86_64_PLT32: /* binutils commit 451875b4f976a527395e9303224c7881b65e12ed feature/regression. */
667	{
668	const Elf_Addr SourceAddr = SecAddr + paRels[iRel].r_offset + BaseAddr; /* Where the source really is. */
669	const Elf_Addr Value = SymValue + paRels[iRel].r_addend - SourceAddr;
670	(int32_t )pAddrW = (int32_t)Value;
671	Log4((FMT_ELF_ADDR": R_X86_64_PC32 Value=" FMT_ELF_ADDR " SymValue=" FMT_ELF_ADDR "\n",
672	SourceAddr, Value, SymValue));
673	AssertMsgReturn((Elf_Addr)(int32_t )pAddrW == Value, ("Value=" FMT_ELF_ADDR "\n", Value), VERR_SYMBOL_VALUE_TOO_BIG); /** @todo check the sign-extending here. */
674	break;
675	}
676
677	/* ignore */
678	case R_X86_64_NONE:
679	break;
680	#endif
681
682	default:
683	AssertMsgFailed(("Unknown relocation type: %d (iRel=%d iRelMax=%d)\n",
684	ELF_R_TYPE(paRels[iRel].r_info), iRel, iRelMax));
685	return VERR_LDRELF_RELOCATION_NOT_SUPPORTED;
686	}
687	}
688
689	return VINF_SUCCESS;
690	}
691
692
693
694	/** @copydoc RTLDROPS::pfnClose */
695	static DECLCALLBACK(int) RTLDRELF_NAME(Close)(PRTLDRMODINTERNAL pMod)
696	{
697	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
698
699	if (pModElf->paShdrs)
700	{
701	RTMemFree(pModElf->paShdrs);
702	pModElf->paShdrs = NULL;
703	}
704
705	if (pModElf->pvBits)
706	{
707	pModElf->Core.pReader->pfnUnmap(pModElf->Core.pReader, pModElf->pvBits);
708	pModElf->pvBits = NULL;
709	}
710
711	return VINF_SUCCESS;
712	}
713
714
715	/** @copydoc RTLDROPS::Done */
716	static DECLCALLBACK(int) RTLDRELF_NAME(Done)(PRTLDRMODINTERNAL pMod)
717	{
718	NOREF(pMod); /PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;/
719	/** @todo Have to think more about this .... */
720	return -1;
721	}
722
723
724	/** @copydoc RTLDROPS::EnumSymbols */
725	static DECLCALLBACK(int) RTLDRELF_NAME(EnumSymbols)(PRTLDRMODINTERNAL pMod, unsigned fFlags, const void *pvBits, RTUINTPTR BaseAddress,
726	PFNRTLDRENUMSYMS pfnCallback, void *pvUser)
727	{
728	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
729	NOREF(pvBits);
730
731	/*
732	* Validate the input.
733	*/
734	Elf_Addr BaseAddr = (Elf_Addr)BaseAddress;
735	AssertMsgReturn((RTUINTPTR)BaseAddr == BaseAddress, ("%RTptr", BaseAddress), VERR_IMAGE_BASE_TOO_HIGH);
736
737	/*
738	* Make sure we've got the string and symbol tables. (We don't need the pvBits.)
739	*/
740	int rc = RTLDRELF_NAME(MapBits)(pModElf, false);
741	if (RT_FAILURE(rc))
742	return rc;
743
744	/*
745	* Enumerate the symbol table.
746	*/
747	const Elf_Sym *paSyms = pModElf->paSyms;
748	unsigned cSyms = pModElf->cSyms;
749	for (unsigned iSym = 1; iSym < cSyms; iSym++)
750	{
751	/*
752	* Skip imports (undefined).
753	*/
754	if (paSyms[iSym].st_shndx != SHN_UNDEF)
755	{
756	/*
757	* Calc value and get name.
758	*/
759	Elf_Addr Value;
760	if (paSyms[iSym].st_shndx == SHN_ABS)
761	/* absolute symbols are not subject to any relocation. */
762	Value = paSyms[iSym].st_value;
763	else if (paSyms[iSym].st_shndx < pModElf->Ehdr.e_shnum)
764	{
765	if (pModElf->Ehdr.e_type == ET_REL)
766	/* relative to the section. */
767	Value = BaseAddr + paSyms[iSym].st_value + pModElf->paShdrs[paSyms[iSym].st_shndx].sh_addr;
768	else /* Fixed up for link address. */
769	Value = BaseAddr + paSyms[iSym].st_value - pModElf->LinkAddress;
770	}
771	else
772	{
773	AssertMsgFailed(("Arg! paSyms[%u].st_shndx=" FMT_ELF_HALF "\n", iSym, paSyms[iSym].st_shndx));
774	return VERR_BAD_EXE_FORMAT;
775	}
776
777	AssertMsgReturn(paSyms[iSym].st_name < pModElf->cbStr,
778	("String outside string table! iSym=%d paSyms[iSym].st_name=%#x\n", iSym, paSyms[iSym].st_name),
779	VERR_LDRELF_INVALID_SYMBOL_NAME_OFFSET);
780
781	const char *pszName = ELF_STR(pModElf, paSyms[iSym].st_name);
782	/* String termination was already checked when the string table was mapped. */
783	if ( (pszName && *pszName)
784	&& ( (fFlags & RTLDR_ENUM_SYMBOL_FLAGS_ALL)
785	\|\| ELF_ST_BIND(paSyms[iSym].st_info) == STB_GLOBAL)
786	)
787	{
788	/*
789	* Call back.
790	*/
791	AssertMsgReturn(Value == (RTUINTPTR)Value, (FMT_ELF_ADDR "\n", Value), VERR_SYMBOL_VALUE_TOO_BIG);
792	rc = pfnCallback(pMod, pszName, ~0U, (RTUINTPTR)Value, pvUser);
793	if (rc)
794	return rc;
795	}
796	}
797	}
798
799	return VINF_SUCCESS;
800	}
801
802
803	/** @copydoc RTLDROPS::GetImageSize */
804	static DECLCALLBACK(size_t) RTLDRELF_NAME(GetImageSize)(PRTLDRMODINTERNAL pMod)
805	{
806	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
807
808	return pModElf->cbImage;
809	}
810
811
812	/** @copydoc RTLDROPS::GetBits */
813	static DECLCALLBACK(int) RTLDRELF_NAME(GetBits)(PRTLDRMODINTERNAL pMod, void pvBits, RTUINTPTR BaseAddress, PFNRTLDRIMPORT pfnGetImport, void pvUser)
814	{
815	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
816
817	/*
818	* This operation is currently only available on relocatable images.
819	*/
820	switch (pModElf->Ehdr.e_type)
821	{
822	case ET_REL:
823	break;
824	case ET_EXEC:
825	Log(("RTLdrELF: %s: Executable images are not supported yet!\n", pModElf->Core.pReader->pfnLogName(pModElf->Core.pReader)));
826	return VERR_LDRELF_EXEC;
827	case ET_DYN:
828	Log(("RTLdrELF: %s: Dynamic images are not supported yet!\n", pModElf->Core.pReader->pfnLogName(pModElf->Core.pReader)));
829	return VERR_LDRELF_DYN;
830	default: AssertFailedReturn(VERR_BAD_EXE_FORMAT);
831	}
832
833	/*
834	* Load the bits into pvBits.
835	*/
836	const Elf_Shdr *paShdrs = pModElf->paShdrs;
837	for (unsigned iShdr = 0; iShdr < pModElf->Ehdr.e_shnum; iShdr++)
838	{
839	if (paShdrs[iShdr].sh_flags & SHF_ALLOC)
840	{
841	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);
842	switch (paShdrs[iShdr].sh_type)
843	{
844	case SHT_NOBITS:
845	memset((uint8_t *)pvBits + paShdrs[iShdr].sh_addr, 0, (size_t)paShdrs[iShdr].sh_size);
846	break;
847
848	case SHT_PROGBITS:
849	default:
850	{
851	int rc = pModElf->Core.pReader->pfnRead(pModElf->Core.pReader, (uint8_t *)pvBits + paShdrs[iShdr].sh_addr,
852	(size_t)paShdrs[iShdr].sh_size, paShdrs[iShdr].sh_offset);
853	if (RT_FAILURE(rc))
854	{
855	Log(("RTLdrELF: %s: Read error when reading " FMT_ELF_SIZE " bytes at " FMT_ELF_OFF ", iShdr=%d\n",
856	pModElf->Core.pReader->pfnLogName(pModElf->Core.pReader),
857	paShdrs[iShdr].sh_size, paShdrs[iShdr].sh_offset, iShdr));
858	return rc;
859	}
860	}
861	}
862	}
863	}
864
865	/*
866	* Relocate the image.
867	*/
868	return pModElf->Core.pOps->pfnRelocate(pMod, pvBits, BaseAddress, ~(RTUINTPTR)0, pfnGetImport, pvUser);
869	}
870
871
872	/** @copydoc RTLDROPS::Relocate */
873	static DECLCALLBACK(int) RTLDRELF_NAME(Relocate)(PRTLDRMODINTERNAL pMod, void *pvBits, RTUINTPTR NewBaseAddress,
874	RTUINTPTR OldBaseAddress, PFNRTLDRIMPORT pfnGetImport, void *pvUser)
875	{
876	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
877	#ifdef LOG_ENABLED
878	const char *pszLogName = pModElf->Core.pReader->pfnLogName(pModElf->Core.pReader);
879	#endif
880	NOREF(OldBaseAddress);
881
882	/*
883	* This operation is currently only available on relocatable images.
884	*/
885	switch (pModElf->Ehdr.e_type)
886	{
887	case ET_REL:
888	break;
889	case ET_EXEC:
890	Log(("RTLdrELF: %s: Executable images are not supported yet!\n", pszLogName));
891	return VERR_LDRELF_EXEC;
892	case ET_DYN:
893	Log(("RTLdrELF: %s: Dynamic images are not supported yet!\n", pszLogName));
894	return VERR_LDRELF_DYN;
895	default: AssertFailedReturn(VERR_BAD_EXE_FORMAT);
896	}
897
898	/*
899	* Validate the input.
900	*/
901	Elf_Addr BaseAddr = (Elf_Addr)NewBaseAddress;
902	AssertMsgReturn((RTUINTPTR)BaseAddr == NewBaseAddress, ("%RTptr", NewBaseAddress), VERR_IMAGE_BASE_TOO_HIGH);
903
904	/*
905	* Map the image bits if not already done and setup pointer into it.
906	*/
907	int rc = RTLDRELF_NAME(MapBits)(pModElf, true);
908	if (RT_FAILURE(rc))
909	return rc;
910
911	/*
912	* Iterate the sections looking for interesting SHT_REL[A] sections.
913	* SHT_REL[A] sections have the section index of the section they contain fixups
914	* for in the sh_info member.
915	*/
916	const Elf_Shdr *paShdrs = pModElf->paShdrs;
917	Log2(("rtLdrElf: %s: Fixing up image\n", pszLogName));
918	for (unsigned iShdr = 0; iShdr < pModElf->Ehdr.e_shnum; iShdr++)
919	{
920	const Elf_Shdr *pShdrRel = &paShdrs[iShdr];
921
922	/*
923	* Skip sections without interest to us.
924	*/
925	#if ELF_MODE == 32
926	if (pShdrRel->sh_type != SHT_REL)
927	#else
928	if (pShdrRel->sh_type != SHT_RELA)
929	#endif
930	continue;
931	if (pShdrRel->sh_info >= pModElf->Ehdr.e_shnum)
932	continue;
933	const Elf_Shdr pShdr = &paShdrs[pShdrRel->sh_info]; / the section to fixup. */
934	if (!(pShdr->sh_flags & SHF_ALLOC))
935	continue;
936
937	/*
938	* Relocate the section.
939	*/
940	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",
941	pszLogName, (int)pShdrRel->sh_info, ELF_SH_STR(pModElf, pShdr->sh_name), (int)pShdr->sh_info, (int)pShdr->sh_link,
942	iShdr, ELF_SH_STR(pModElf, pShdrRel->sh_name), (int)pShdrRel->sh_info, (int)pShdrRel->sh_link));
943
944	/** @todo Make RelocateSection a function pointer so we can select the one corresponding to the machine when opening the image. */
945	if (pModElf->Ehdr.e_type == ET_REL)
946	rc = RTLDRELF_NAME(RelocateSection)(pModElf, BaseAddr, pfnGetImport, pvUser,
947	pShdr->sh_addr,
948	pShdr->sh_size,
949	(const uint8_t *)pModElf->pvBits + pShdr->sh_offset,
950	(uint8_t *)pvBits + pShdr->sh_addr,
951	(const uint8_t *)pModElf->pvBits + pShdrRel->sh_offset,
952	pShdrRel->sh_size);
953	else
954	rc = RTLDRELF_NAME(RelocateSectionExecDyn)(pModElf, BaseAddr, pfnGetImport, pvUser,
955	pShdr->sh_addr,
956	pShdr->sh_size,
957	(const uint8_t *)pModElf->pvBits + pShdr->sh_offset,
958	(uint8_t *)pvBits + pShdr->sh_addr,
959	(const uint8_t *)pModElf->pvBits + pShdrRel->sh_offset,
960	pShdrRel->sh_size);
961	if (RT_FAILURE(rc))
962	return rc;
963	}
964	return VINF_SUCCESS;
965	}
966
967
968	/**
969	* Worker for pfnGetSymbolEx.
970	*/
971	static int RTLDRELF_NAME(ReturnSymbol)(PRTLDRMODELF pThis, const Elf_Sym *pSym, Elf_Addr uBaseAddr, PRTUINTPTR pValue)
972	{
973	Elf_Addr Value;
974	if (pSym->st_shndx == SHN_ABS)
975	/* absolute symbols are not subject to any relocation. */
976	Value = pSym->st_value;
977	else if (pSym->st_shndx < pThis->Ehdr.e_shnum)
978	{
979	if (pThis->Ehdr.e_type == ET_REL)
980	/* relative to the section. */
981	Value = uBaseAddr + pSym->st_value + pThis->paShdrs[pSym->st_shndx].sh_addr;
982	else /* Fixed up for link address. */
983	Value = uBaseAddr + pSym->st_value - pThis->LinkAddress;
984	}
985	else
986	{
987	AssertMsgFailed(("Arg! pSym->st_shndx=%d\n", pSym->st_shndx));
988	return VERR_BAD_EXE_FORMAT;
989	}
990	AssertMsgReturn(Value == (RTUINTPTR)Value, (FMT_ELF_ADDR "\n", Value), VERR_SYMBOL_VALUE_TOO_BIG);
991	*pValue = (RTUINTPTR)Value;
992	return VINF_SUCCESS;
993	}
994
995
996	/** @copydoc RTLDROPS::pfnGetSymbolEx */
997	static DECLCALLBACK(int) RTLDRELF_NAME(GetSymbolEx)(PRTLDRMODINTERNAL pMod, const void *pvBits, RTUINTPTR BaseAddress,
998	uint32_t iOrdinal, const char pszSymbol, RTUINTPTR pValue)
999	{
1000	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
1001	NOREF(pvBits);
1002
1003	/*
1004	* Validate the input.
1005	*/
1006	Elf_Addr uBaseAddr = (Elf_Addr)BaseAddress;
1007	AssertMsgReturn((RTUINTPTR)uBaseAddr == BaseAddress, ("%RTptr", BaseAddress), VERR_IMAGE_BASE_TOO_HIGH);
1008
1009	/*
1010	* Map the image bits if not already done and setup pointer into it.
1011	*/
1012	int rc = RTLDRELF_NAME(MapBits)(pModElf, true);
1013	if (RT_FAILURE(rc))
1014	return rc;
1015
1016	/*
1017	* Calc all kinds of pointers before we start iterating the symbol table.
1018	*/
1019	const Elf_Sym *paSyms = pModElf->paSyms;
1020	unsigned cSyms = pModElf->cSyms;
1021	if (iOrdinal == UINT32_MAX)
1022	{
1023	const char *pStr = pModElf->pStr;
1024	for (unsigned iSym = 1; iSym < cSyms; iSym++)
1025	{
1026	/* Undefined symbols are not exports, they are imports. */
1027	if ( paSyms[iSym].st_shndx != SHN_UNDEF
1028	&& ( ELF_ST_BIND(paSyms[iSym].st_info) == STB_GLOBAL
1029	\|\| ELF_ST_BIND(paSyms[iSym].st_info) == STB_WEAK))
1030	{
1031	/* Validate the name string and try match with it. */
1032	if (paSyms[iSym].st_name < pModElf->cbStr)
1033	{
1034	if (!strcmp(pszSymbol, pStr + paSyms[iSym].st_name))
1035	{
1036	/* matched! */
1037	return RTLDRELF_NAME(ReturnSymbol)(pModElf, &paSyms[iSym], uBaseAddr, pValue);
1038	}
1039	}
1040	else
1041	{
1042	AssertMsgFailed(("String outside string table! iSym=%d paSyms[iSym].st_name=%#x\n", iSym, paSyms[iSym].st_name));
1043	return VERR_LDRELF_INVALID_SYMBOL_NAME_OFFSET;
1044	}
1045	}
1046	}
1047	}
1048	else if (iOrdinal < cSyms)
1049	{
1050	if ( paSyms[iOrdinal].st_shndx != SHN_UNDEF
1051	&& ( ELF_ST_BIND(paSyms[iOrdinal].st_info) == STB_GLOBAL
1052	\|\| ELF_ST_BIND(paSyms[iOrdinal].st_info) == STB_WEAK))
1053	return RTLDRELF_NAME(ReturnSymbol)(pModElf, &paSyms[iOrdinal], uBaseAddr, pValue);
1054	}
1055
1056	return VERR_SYMBOL_NOT_FOUND;
1057	}
1058
1059
1060	/** @copydoc RTLDROPS::pfnEnumDbgInfo */
1061	static DECLCALLBACK(int) RTLDRELF_NAME(EnumDbgInfo)(PRTLDRMODINTERNAL pMod, const void *pvBits,
1062	PFNRTLDRENUMDBG pfnCallback, void *pvUser)
1063	{
1064	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
1065	RT_NOREF_PV(pvBits);
1066
1067	/*
1068	* Map the image bits if not already done and setup pointer into it.
1069	*/
1070	int rc = RTLDRELF_NAME(MapBits)(pModElf, true);
1071	if (RT_FAILURE(rc))
1072	return rc;
1073
1074	/*
1075	* Do the enumeration.
1076	*/
1077	const Elf_Shdr *paShdrs = pModElf->paOrgShdrs;
1078	for (unsigned iShdr = 0; iShdr < pModElf->Ehdr.e_shnum; iShdr++)
1079	{
1080	/* Debug sections are expected to be PROGBITS and not allocated. */
1081	if (paShdrs[iShdr].sh_type != SHT_PROGBITS)
1082	continue;
1083	if (paShdrs[iShdr].sh_flags & SHF_ALLOC)
1084	continue;
1085
1086	RTLDRDBGINFO DbgInfo;
1087	const char *pszSectName = ELF_SH_STR(pModElf, paShdrs[iShdr].sh_name);
1088	if ( !strncmp(pszSectName, RT_STR_TUPLE(".debug_"))
1089	\|\| !strcmp(pszSectName, ".WATCOM_references") )
1090	{
1091	RT_ZERO(DbgInfo.u);
1092	DbgInfo.enmType = RTLDRDBGINFOTYPE_DWARF;
1093	DbgInfo.pszExtFile = NULL;
1094	DbgInfo.offFile = paShdrs[iShdr].sh_offset;
1095	DbgInfo.cb = paShdrs[iShdr].sh_size;
1096	DbgInfo.u.Dwarf.pszSection = pszSectName;
1097	}
1098	else if (!strcmp(pszSectName, ".gnu_debuglink"))
1099	{
1100	if ((paShdrs[iShdr].sh_size & 3) \|\| paShdrs[iShdr].sh_size < 8)
1101	return VERR_BAD_EXE_FORMAT;
1102
1103	RT_ZERO(DbgInfo.u);
1104	DbgInfo.enmType = RTLDRDBGINFOTYPE_DWARF_DWO;
1105	DbgInfo.pszExtFile = (const char *)((uintptr_t)pModElf->pvBits + (uintptr_t)paShdrs[iShdr].sh_offset);
1106	if (!RTStrEnd(DbgInfo.pszExtFile, paShdrs[iShdr].sh_size))
1107	return VERR_BAD_EXE_FORMAT;
1108	DbgInfo.u.Dwo.uCrc32 = (uint32_t )((uintptr_t)DbgInfo.pszExtFile + (uintptr_t)paShdrs[iShdr].sh_size
1109	- sizeof(uint32_t));
1110	DbgInfo.offFile = -1;
1111	DbgInfo.cb = 0;
1112	}
1113	else
1114	continue;
1115
1116	DbgInfo.LinkAddress = NIL_RTLDRADDR;
1117	DbgInfo.iDbgInfo = iShdr - 1;
1118
1119	rc = pfnCallback(pMod, &DbgInfo, pvUser);
1120	if (rc != VINF_SUCCESS)
1121	return rc;
1122
1123	}
1124
1125	return VINF_SUCCESS;
1126	}
1127
1128
1129	/**
1130	* Helper that locates the first allocated section.
1131	*
1132	* @returns Pointer to the section header if found, NULL if none.
1133	* @param pShdr The section header to start searching at.
1134	* @param cLeft The number of section headers left to search. Can be 0.
1135	*/
1136	static const Elf_Shdr RTLDRELF_NAME(GetFirstAllocatedSection)(const Elf_Shdr pShdr, unsigned cLeft)
1137	{
1138	while (cLeft-- > 0)
1139	{
1140	if (pShdr->sh_flags & SHF_ALLOC)
1141	return pShdr;
1142	pShdr++;
1143	}
1144	return NULL;
1145	}
1146
1147	/** @copydoc RTLDROPS::pfnEnumSegments. */
1148	static DECLCALLBACK(int) RTLDRELF_NAME(EnumSegments)(PRTLDRMODINTERNAL pMod, PFNRTLDRENUMSEGS pfnCallback, void *pvUser)
1149	{
1150	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
1151
1152	/*
1153	* Map the image bits if not already done and setup pointer into it.
1154	*/
1155	int rc = RTLDRELF_NAME(MapBits)(pModElf, true);
1156	if (RT_FAILURE(rc))
1157	return rc;
1158
1159	/*
1160	* Do the enumeration.
1161	*/
1162	char szName[32];
1163	Elf_Addr uPrevMappedRva = 0;
1164	const Elf_Shdr *paShdrs = pModElf->paShdrs;
1165	const Elf_Shdr *paOrgShdrs = pModElf->paOrgShdrs;
1166	for (unsigned iShdr = 1; iShdr < pModElf->Ehdr.e_shnum; iShdr++)
1167	{
1168	RTLDRSEG Seg;
1169	Seg.pszName = ELF_SH_STR(pModElf, paShdrs[iShdr].sh_name);
1170	Seg.cchName = (uint32_t)strlen(Seg.pszName);
1171	if (Seg.cchName == 0)
1172	{
1173	Seg.pszName = szName;
1174	Seg.cchName = (uint32_t)RTStrPrintf(szName, sizeof(szName), "UnamedSect%02u", iShdr);
1175	}
1176	Seg.SelFlat = 0;
1177	Seg.Sel16bit = 0;
1178	Seg.fFlags = 0;
1179	Seg.fProt = RTMEM_PROT_READ;
1180	if (paShdrs[iShdr].sh_flags & SHF_WRITE)
1181	Seg.fProt \|= RTMEM_PROT_WRITE;
1182	if (paShdrs[iShdr].sh_flags & SHF_EXECINSTR)
1183	Seg.fProt \|= RTMEM_PROT_EXEC;
1184	Seg.cb = paShdrs[iShdr].sh_size;
1185	Seg.Alignment = paShdrs[iShdr].sh_addralign;
1186	if (paShdrs[iShdr].sh_flags & SHF_ALLOC)
1187	{
1188	Seg.LinkAddress = paOrgShdrs[iShdr].sh_addr;
1189	Seg.RVA = paShdrs[iShdr].sh_addr;
1190	const Elf_Shdr *pShdr2 = RTLDRELF_NAME(GetFirstAllocatedSection)(&paShdrs[iShdr + 1],
1191	pModElf->Ehdr.e_shnum - iShdr - 1);
1192	if ( pShdr2
1193	&& pShdr2->sh_addr >= paShdrs[iShdr].sh_addr
1194	&& Seg.RVA >= uPrevMappedRva)
1195	Seg.cbMapped = pShdr2->sh_addr - paShdrs[iShdr].sh_addr;
1196	else
1197	Seg.cbMapped = RT_MAX(paShdrs[iShdr].sh_size, paShdrs[iShdr].sh_addralign);
1198	uPrevMappedRva = Seg.RVA;
1199	}
1200	else
1201	{
1202	Seg.LinkAddress = NIL_RTLDRADDR;
1203	Seg.RVA = NIL_RTLDRADDR;
1204	Seg.cbMapped = NIL_RTLDRADDR;
1205	}
1206	if (paShdrs[iShdr].sh_type != SHT_NOBITS)
1207	{
1208	Seg.offFile = paShdrs[iShdr].sh_offset;
1209	Seg.cbFile = paShdrs[iShdr].sh_size;
1210	}
1211	else
1212	{
1213	Seg.offFile = -1;
1214	Seg.cbFile = 0;
1215	}
1216
1217	rc = pfnCallback(pMod, &Seg, pvUser);
1218	if (rc != VINF_SUCCESS)
1219	return rc;
1220	}
1221
1222	return VINF_SUCCESS;
1223	}
1224
1225
1226	/** @copydoc RTLDROPS::pfnLinkAddressToSegOffset. */
1227	static DECLCALLBACK(int) RTLDRELF_NAME(LinkAddressToSegOffset)(PRTLDRMODINTERNAL pMod, RTLDRADDR LinkAddress,
1228	uint32_t *piSeg, PRTLDRADDR poffSeg)
1229	{
1230	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
1231
1232	const Elf_Shdr *pShdrEnd = NULL;
1233	unsigned cLeft = pModElf->Ehdr.e_shnum - 1;
1234	const Elf_Shdr *pShdr = &pModElf->paOrgShdrs[cLeft];
1235	while (cLeft-- > 0)
1236	{
1237	if (pShdr->sh_flags & SHF_ALLOC)
1238	{
1239	RTLDRADDR offSeg = LinkAddress - pShdr->sh_addr;
1240	if (offSeg < pShdr->sh_size)
1241	{
1242	*poffSeg = offSeg;
1243	*piSeg = cLeft;
1244	return VINF_SUCCESS;
1245	}
1246	if (offSeg == pShdr->sh_size)
1247	pShdrEnd = pShdr;
1248	}
1249	pShdr--;
1250	}
1251
1252	if (pShdrEnd)
1253	{
1254	*poffSeg = pShdrEnd->sh_size;
1255	*piSeg = pShdrEnd - pModElf->paOrgShdrs - 1;
1256	return VINF_SUCCESS;
1257	}
1258
1259	return VERR_LDR_INVALID_LINK_ADDRESS;
1260	}
1261
1262
1263	/** @copydoc RTLDROPS::pfnLinkAddressToRva. */
1264	static DECLCALLBACK(int) RTLDRELF_NAME(LinkAddressToRva)(PRTLDRMODINTERNAL pMod, RTLDRADDR LinkAddress, PRTLDRADDR pRva)
1265	{
1266	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
1267	uint32_t iSeg;
1268	RTLDRADDR offSeg;
1269	int rc = RTLDRELF_NAME(LinkAddressToSegOffset)(pMod, LinkAddress, &iSeg, &offSeg);
1270	if (RT_SUCCESS(rc))
1271	*pRva = pModElf->paShdrs[iSeg + 1].sh_addr + offSeg;
1272	return rc;
1273	}
1274
1275
1276	/** @copydoc RTLDROPS::pfnSegOffsetToRva. */
1277	static DECLCALLBACK(int) RTLDRELF_NAME(SegOffsetToRva)(PRTLDRMODINTERNAL pMod, uint32_t iSeg, RTLDRADDR offSeg,
1278	PRTLDRADDR pRva)
1279	{
1280	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
1281	if (iSeg >= pModElf->Ehdr.e_shnum - 1U)
1282	return VERR_LDR_INVALID_SEG_OFFSET;
1283
1284	iSeg++; /* skip section 0 */
1285	if (offSeg > pModElf->paShdrs[iSeg].sh_size)
1286	{
1287	const Elf_Shdr *pShdr2 = RTLDRELF_NAME(GetFirstAllocatedSection)(&pModElf->paShdrs[iSeg + 1],
1288	pModElf->Ehdr.e_shnum - iSeg - 1);
1289	if ( !pShdr2
1290	\|\| offSeg > (pShdr2->sh_addr - pModElf->paShdrs[iSeg].sh_addr))
1291	return VERR_LDR_INVALID_SEG_OFFSET;
1292	}
1293
1294	if (!(pModElf->paShdrs[iSeg].sh_flags & SHF_ALLOC))
1295	return VERR_LDR_INVALID_SEG_OFFSET;
1296
1297	*pRva = pModElf->paShdrs[iSeg].sh_addr;
1298	return VINF_SUCCESS;
1299	}
1300
1301
1302	/** @copydoc RTLDROPS::pfnRvaToSegOffset. */
1303	static DECLCALLBACK(int) RTLDRELF_NAME(RvaToSegOffset)(PRTLDRMODINTERNAL pMod, RTLDRADDR Rva,
1304	uint32_t *piSeg, PRTLDRADDR poffSeg)
1305	{
1306	PRTLDRMODELF pModElf = (PRTLDRMODELF)pMod;
1307
1308	Elf_Addr PrevAddr = 0;
1309	unsigned cLeft = pModElf->Ehdr.e_shnum - 1;
1310	const Elf_Shdr *pShdr = &pModElf->paShdrs[cLeft];
1311	while (cLeft-- > 0)
1312	{
1313	if (pShdr->sh_flags & SHF_ALLOC)
1314	{
1315	Elf_Addr cbSeg = PrevAddr ? PrevAddr - pShdr->sh_addr : pShdr->sh_size;
1316	RTLDRADDR offSeg = Rva - pShdr->sh_addr;
1317	if (offSeg <= cbSeg)
1318	{
1319	*poffSeg = offSeg;
1320	*piSeg = cLeft;
1321	return VINF_SUCCESS;
1322	}
1323	PrevAddr = pShdr->sh_addr;
1324	}
1325	pShdr--;
1326	}
1327
1328	return VERR_LDR_INVALID_RVA;
1329	}
1330
1331
1332	/** @callback_method_impl{FNRTLDRIMPORT, Stub used by ReadDbgInfo.} */
1333	static DECLCALLBACK(int) RTLDRELF_NAME(GetImportStubCallback)(RTLDRMOD hLdrMod, const char pszModule, const char pszSymbol,
1334	unsigned uSymbol, PRTLDRADDR pValue, void *pvUser)
1335	{
1336	RT_NOREF_PV(hLdrMod); RT_NOREF_PV(pszModule); RT_NOREF_PV(pszSymbol);
1337	RT_NOREF_PV(uSymbol); RT_NOREF_PV(pValue); RT_NOREF_PV(pvUser);
1338	return VERR_SYMBOL_NOT_FOUND;
1339	}
1340
1341
1342	/** @copydoc RTLDROPS::pfnReadDbgInfo. */
1343	static DECLCALLBACK(int) RTLDRELF_NAME(ReadDbgInfo)(PRTLDRMODINTERNAL pMod, uint32_t iDbgInfo, RTFOFF off,
1344	size_t cb, void *pvBuf)
1345	{
1346	PRTLDRMODELF pThis = (PRTLDRMODELF)pMod;
1347	LogFlow(("%s: iDbgInfo=%#x off=%RTfoff cb=%#zu\n", __FUNCTION__, iDbgInfo, off, cb));
1348
1349	/*
1350	* Input validation.
1351	*/
1352	AssertReturn(iDbgInfo < pThis->Ehdr.e_shnum && iDbgInfo + 1 < pThis->Ehdr.e_shnum, VERR_INVALID_PARAMETER);
1353	iDbgInfo++;
1354	AssertReturn(!(pThis->paShdrs[iDbgInfo].sh_flags & SHF_ALLOC), VERR_INVALID_PARAMETER);
1355	AssertReturn(pThis->paShdrs[iDbgInfo].sh_type == SHT_PROGBITS, VERR_INVALID_PARAMETER);
1356	AssertReturn(pThis->paShdrs[iDbgInfo].sh_offset == (uint64_t)off, VERR_INVALID_PARAMETER);
1357	AssertReturn(pThis->paShdrs[iDbgInfo].sh_size == cb, VERR_INVALID_PARAMETER);
1358	uint64_t cbRawImage = pThis->Core.pReader->pfnSize(pThis->Core.pReader);
1359	AssertReturn(off >= 0 && cb <= cbRawImage && (uint64_t)off + cb <= cbRawImage, VERR_INVALID_PARAMETER);
1360
1361	/*
1362	* Read it from the file and look for fixup sections.
1363	*/
1364	int rc;
1365	if (pThis->pvBits)
1366	memcpy(pvBuf, (const uint8_t *)pThis->pvBits + (size_t)off, cb);
1367	else
1368	{
1369	rc = pThis->Core.pReader->pfnRead(pThis->Core.pReader, pvBuf, cb, off);
1370	if (RT_FAILURE(rc))
1371	return rc;
1372	}
1373
1374	uint32_t iRelocs = iDbgInfo + 1;
1375	if ( iRelocs >= pThis->Ehdr.e_shnum
1376	\|\| pThis->paShdrs[iRelocs].sh_info != iDbgInfo
1377	\|\| ( pThis->paShdrs[iRelocs].sh_type != SHT_REL
1378	&& pThis->paShdrs[iRelocs].sh_type != SHT_RELA) )
1379	{
1380	iRelocs = 0;
1381	while ( iRelocs < pThis->Ehdr.e_shnum
1382	&& ( pThis->paShdrs[iRelocs].sh_info != iDbgInfo
1383	\|\| ( pThis->paShdrs[iRelocs].sh_type != SHT_REL
1384	&& pThis->paShdrs[iRelocs].sh_type != SHT_RELA)) )
1385	iRelocs++;
1386	}
1387	if ( iRelocs < pThis->Ehdr.e_shnum
1388	&& pThis->paShdrs[iRelocs].sh_size > 0)
1389	{
1390	/*
1391	* Load the relocations.
1392	*/
1393	uint8_t *pbRelocsBuf = NULL;
1394	const uint8_t *pbRelocs;
1395	if (pThis->pvBits)
1396	pbRelocs = (const uint8_t *)pThis->pvBits + pThis->paShdrs[iRelocs].sh_offset;
1397	else
1398	{
1399	pbRelocs = pbRelocsBuf = (uint8_t *)RTMemTmpAlloc(pThis->paShdrs[iRelocs].sh_size);
1400	if (!pbRelocsBuf)
1401	return VERR_NO_TMP_MEMORY;
1402	rc = pThis->Core.pReader->pfnRead(pThis->Core.pReader, pbRelocsBuf,
1403	pThis->paShdrs[iRelocs].sh_size,
1404	pThis->paShdrs[iRelocs].sh_offset);
1405	if (RT_FAILURE(rc))
1406	{
1407	RTMemTmpFree(pbRelocsBuf);
1408	return rc;
1409	}
1410	}
1411
1412	/*
1413	* Apply the relocations.
1414	*/
1415	if (pThis->Ehdr.e_type == ET_REL)
1416	rc = RTLDRELF_NAME(RelocateSection)(pThis, pThis->LinkAddress,
1417	RTLDRELF_NAME(GetImportStubCallback), NULL /pvUser/,
1418	pThis->paShdrs[iDbgInfo].sh_addr,
1419	pThis->paShdrs[iDbgInfo].sh_size,
1420	(const uint8_t *)pvBuf,
1421	(uint8_t *)pvBuf,
1422	pbRelocs,
1423	pThis->paShdrs[iRelocs].sh_size);
1424	else
1425	rc = RTLDRELF_NAME(RelocateSectionExecDyn)(pThis, pThis->LinkAddress,
1426	RTLDRELF_NAME(GetImportStubCallback), NULL /pvUser/,
1427	pThis->paShdrs[iDbgInfo].sh_addr,
1428	pThis->paShdrs[iDbgInfo].sh_size,
1429	(const uint8_t *)pvBuf,
1430	(uint8_t *)pvBuf,
1431	pbRelocs,
1432	pThis->paShdrs[iRelocs].sh_size);
1433
1434	RTMemTmpFree(pbRelocsBuf);
1435	}
1436	else
1437	rc = VINF_SUCCESS;
1438	return rc;
1439	}
1440
1441
1442	/**
1443	* @interface_method_impl{RTLDROPS,pfnUnwindFrame}
1444	*/
1445	static DECLCALLBACK(int)
1446	RTLDRELF_NAME(UnwindFrame)(PRTLDRMODINTERNAL pMod, void const *pvBits, uint32_t iSeg, RTUINTPTR off, PRTDBGUNWINDSTATE pState)
1447	{
1448	PRTLDRMODELF pThis = (PRTLDRMODELF)pMod;
1449	LogFlow(("%s: iSeg=%#x off=%RTptr\n", __FUNCTION__, iSeg, off));
1450
1451	/*
1452	* Process the input address, making us both RVA and proper seg:offset out of it.
1453	*/
1454	int rc;
1455	RTLDRADDR uRva = off;
1456	if (iSeg == UINT32_MAX)
1457	rc = RTLDRELF_NAME(RvaToSegOffset)(pMod, uRva, &iSeg, &off);
1458	else
1459	rc = RTLDRELF_NAME(SegOffsetToRva)(pMod, iSeg, off, &uRva);
1460	AssertRCReturn(rc, rc);
1461
1462	/*
1463	* Map the image bits if not already done and setup pointer into it.
1464	*/
1465	RT_NOREF(pvBits); /** @todo Try use passed in pvBits? */
1466	rc = RTLDRELF_NAME(MapBits)(pThis, true);
1467	if (RT_FAILURE(rc))
1468	return rc;
1469
1470	/*
1471	* Do we need to search for .eh_frame and .eh_frame_hdr?
1472	*/
1473	if (pThis->iShEhFrame == 0)
1474	{
1475	pThis->iShEhFrame = ~0U;
1476	pThis->iShEhFrameHdr = ~0U;
1477	unsigned cLeft = 2;
1478	for (unsigned iShdr = 1; iShdr < pThis->Ehdr.e_shnum; iShdr++)
1479	{
1480	const char *pszName = ELF_SH_STR(pThis, pThis->paShdrs[iShdr].sh_name);
1481	if ( pszName[0] == '.'
1482	&& pszName[1] == 'e'
1483	&& pszName[2] == 'h'
1484	&& pszName[3] == '_'
1485	&& pszName[4] == 'f'
1486	&& pszName[5] == 'r'
1487	&& pszName[6] == 'a'
1488	&& pszName[7] == 'm'
1489	&& pszName[8] == 'e')
1490	{
1491	if (pszName[9] == '\0')
1492	pThis->iShEhFrame = iShdr;
1493	else if ( pszName[9] == '_'
1494	&& pszName[10] == 'h'
1495	&& pszName[11] == 'd'
1496	&& pszName[12] == 'r'
1497	&& pszName[13] == '\0')
1498	pThis->iShEhFrameHdr = iShdr;
1499	else
1500	continue;
1501	if (--cLeft == 0)
1502	break;
1503	}
1504	}
1505	}
1506
1507	/*
1508	* Any info present?
1509	*/
1510	unsigned iShdr = pThis->iShEhFrame;
1511	if ( iShdr != ~0U
1512	&& pThis->paShdrs[iShdr].sh_size > 0)
1513	{
1514	if (pThis->paShdrs[iShdr].sh_flags & SHF_ALLOC)
1515	return rtDwarfUnwind_EhData((uint8_t const *)pThis->pvBits + pThis->paShdrs[iShdr].sh_addr,
1516	pThis->paShdrs[iShdr].sh_size, pThis->paShdrs[iShdr].sh_addr,
1517	iSeg, off, uRva, pState, pThis->Core.enmArch);
1518	}
1519	return VERR_DBG_NO_UNWIND_INFO;
1520	}
1521
1522
1523	/**
1524	* The ELF module operations.
1525	*/
1526	static RTLDROPS RTLDRELF_MID(s_rtldrElf,Ops) =
1527	{
1528	#if ELF_MODE == 32
1529	"elf32",
1530	#elif ELF_MODE == 64
1531	"elf64",
1532	#endif
1533	RTLDRELF_NAME(Close),
1534	NULL, /* Get Symbol */
1535	RTLDRELF_NAME(Done),
1536	RTLDRELF_NAME(EnumSymbols),
1537	/* ext: */
1538	RTLDRELF_NAME(GetImageSize),
1539	RTLDRELF_NAME(GetBits),
1540	RTLDRELF_NAME(Relocate),
1541	RTLDRELF_NAME(GetSymbolEx),
1542	NULL /pfnQueryForwarderInfo/,
1543	RTLDRELF_NAME(EnumDbgInfo),
1544	RTLDRELF_NAME(EnumSegments),
1545	RTLDRELF_NAME(LinkAddressToSegOffset),
1546	RTLDRELF_NAME(LinkAddressToRva),
1547	RTLDRELF_NAME(SegOffsetToRva),
1548	RTLDRELF_NAME(RvaToSegOffset),
1549	RTLDRELF_NAME(ReadDbgInfo),
1550	NULL /pfnQueryProp/,
1551	NULL /pfnVerifySignature/,
1552	NULL /pfnHashImage/,
1553	RTLDRELF_NAME(UnwindFrame),
1554	42
1555	};
1556
1557
1558
1559	/**
1560	* Validates the ELF header.
1561	*
1562	* @returns iprt status code.
1563	* @param pEhdr Pointer to the ELF header.
1564	* @param pszLogName The log name.
1565	* @param cbRawImage The size of the raw image.
1566	*/
1567	static int RTLDRELF_NAME(ValidateElfHeader)(const Elf_Ehdr pEhdr, const char pszLogName, uint64_t cbRawImage,
1568	PRTLDRARCH penmArch)
1569	{
1570	Log3(("RTLdrELF: e_ident: %.*Rhxs\n"
1571	"RTLdrELF: e_type: " FMT_ELF_HALF "\n"
1572	"RTLdrELF: e_version: " FMT_ELF_HALF "\n"
1573	"RTLdrELF: e_entry: " FMT_ELF_ADDR "\n"
1574	"RTLdrELF: e_phoff: " FMT_ELF_OFF "\n"
1575	"RTLdrELF: e_shoff: " FMT_ELF_OFF "\n"
1576	"RTLdrELF: e_flags: " FMT_ELF_WORD "\n"
1577	"RTLdrELF: e_ehsize: " FMT_ELF_HALF "\n"
1578	"RTLdrELF: e_phentsize: " FMT_ELF_HALF "\n"
1579	"RTLdrELF: e_phnum: " FMT_ELF_HALF "\n"
1580	"RTLdrELF: e_shentsize: " FMT_ELF_HALF "\n"
1581	"RTLdrELF: e_shnum: " FMT_ELF_HALF "\n"
1582	"RTLdrELF: e_shstrndx: " FMT_ELF_HALF "\n",
1583	RT_ELEMENTS(pEhdr->e_ident), &pEhdr->e_ident[0], pEhdr->e_type, pEhdr->e_version,
1584	pEhdr->e_entry, pEhdr->e_phoff, pEhdr->e_shoff,pEhdr->e_flags, pEhdr->e_ehsize, pEhdr->e_phentsize,
1585	pEhdr->e_phnum, pEhdr->e_shentsize, pEhdr->e_shnum, pEhdr->e_shstrndx));
1586
1587	if ( pEhdr->e_ident[EI_MAG0] != ELFMAG0
1588	\|\| pEhdr->e_ident[EI_MAG1] != ELFMAG1
1589	\|\| pEhdr->e_ident[EI_MAG2] != ELFMAG2
1590	\|\| pEhdr->e_ident[EI_MAG3] != ELFMAG3
1591	)
1592	{
1593	Log(("RTLdrELF: %s: Invalid ELF magic (%.*Rhxs)\n", pszLogName, sizeof(pEhdr->e_ident), pEhdr->e_ident)); NOREF(pszLogName);
1594	return VERR_BAD_EXE_FORMAT;
1595	}
1596	if (pEhdr->e_ident[EI_CLASS] != RTLDRELF_SUFF(ELFCLASS))
1597	{
1598	Log(("RTLdrELF: %s: Invalid ELF class (%.*Rhxs)\n", pszLogName, sizeof(pEhdr->e_ident), pEhdr->e_ident));
1599	return VERR_BAD_EXE_FORMAT;
1600	}
1601	if (pEhdr->e_ident[EI_DATA] != ELFDATA2LSB)
1602	{
1603	Log(("RTLdrELF: %s: ELF endian %x is unsupported\n", pszLogName, pEhdr->e_ident[EI_DATA]));
1604	return VERR_LDRELF_ODD_ENDIAN;
1605	}
1606	if (pEhdr->e_version != EV_CURRENT)
1607	{
1608	Log(("RTLdrELF: %s: ELF version %x is unsupported\n", pszLogName, pEhdr->e_version));
1609	return VERR_LDRELF_VERSION;
1610	}
1611
1612	if (sizeof(Elf_Ehdr) != pEhdr->e_ehsize)
1613	{
1614	Log(("RTLdrELF: %s: Elf header e_ehsize is %d expected %d!\n",
1615	pszLogName, pEhdr->e_ehsize, sizeof(Elf_Ehdr)));
1616	return VERR_BAD_EXE_FORMAT;
1617	}
1618	if ( sizeof(Elf_Phdr) != pEhdr->e_phentsize
1619	&& ( pEhdr->e_phnum != 0
1620	\|\| pEhdr->e_type == ET_DYN))
1621	{
1622	Log(("RTLdrELF: %s: Elf header e_phentsize is %d expected %d!\n",
1623	pszLogName, pEhdr->e_phentsize, sizeof(Elf_Phdr)));
1624	return VERR_BAD_EXE_FORMAT;
1625	}
1626	if (sizeof(Elf_Shdr) != pEhdr->e_shentsize)
1627	{
1628	Log(("RTLdrELF: %s: Elf header e_shentsize is %d expected %d!\n",
1629	pszLogName, pEhdr->e_shentsize, sizeof(Elf_Shdr)));
1630	return VERR_BAD_EXE_FORMAT;
1631	}
1632
1633	switch (pEhdr->e_type)
1634	{
1635	case ET_REL:
1636	case ET_EXEC:
1637	case ET_DYN:
1638	break;
1639	default:
1640	Log(("RTLdrELF: %s: image type %#x is not supported!\n", pszLogName, pEhdr->e_type));
1641	return VERR_BAD_EXE_FORMAT;
1642	}
1643
1644	switch (pEhdr->e_machine)
1645	{
1646	#if ELF_MODE == 32
1647	case EM_386:
1648	case EM_486:
1649	*penmArch = RTLDRARCH_X86_32;
1650	break;
1651	#elif ELF_MODE == 64
1652	case EM_X86_64:
1653	*penmArch = RTLDRARCH_AMD64;
1654	break;
1655	#endif
1656	default:
1657	Log(("RTLdrELF: %s: machine type %u is not supported!\n", pszLogName, pEhdr->e_machine));
1658	return VERR_LDRELF_MACHINE;
1659	}
1660
1661	if ( pEhdr->e_phoff < pEhdr->e_ehsize
1662	&& !(pEhdr->e_phoff && pEhdr->e_phnum)
1663	&& pEhdr->e_phnum)
1664	{
1665	Log(("RTLdrELF: %s: The program headers overlap with the ELF header! e_phoff=" FMT_ELF_OFF "\n",
1666	pszLogName, pEhdr->e_phoff));
1667	return VERR_BAD_EXE_FORMAT;
1668	}
1669	if ( pEhdr->e_phoff + pEhdr->e_phnum * pEhdr->e_phentsize > cbRawImage
1670	\|\| pEhdr->e_phoff + pEhdr->e_phnum * pEhdr->e_phentsize < pEhdr->e_phoff)
1671	{
1672	Log(("RTLdrELF: %s: The program headers extends beyond the file! e_phoff=" FMT_ELF_OFF " e_phnum=" FMT_ELF_HALF "\n",
1673	pszLogName, pEhdr->e_phoff, pEhdr->e_phnum));
1674	return VERR_BAD_EXE_FORMAT;
1675	}
1676
1677
1678	if ( pEhdr->e_shoff < pEhdr->e_ehsize
1679	&& !(pEhdr->e_shoff && pEhdr->e_shnum))
1680	{
1681	Log(("RTLdrELF: %s: The section headers overlap with the ELF header! e_shoff=" FMT_ELF_OFF "\n",
1682	pszLogName, pEhdr->e_shoff));
1683	return VERR_BAD_EXE_FORMAT;
1684	}
1685	if ( pEhdr->e_shoff + pEhdr->e_shnum * pEhdr->e_shentsize > cbRawImage
1686	\|\| pEhdr->e_shoff + pEhdr->e_shnum * pEhdr->e_shentsize < pEhdr->e_shoff)
1687	{
1688	Log(("RTLdrELF: %s: The section headers extends beyond the file! e_shoff=" FMT_ELF_OFF " e_shnum=" FMT_ELF_HALF "\n",
1689	pszLogName, pEhdr->e_shoff, pEhdr->e_shnum));
1690	return VERR_BAD_EXE_FORMAT;
1691	}
1692
1693	if (pEhdr->e_shstrndx == 0 \|\| pEhdr->e_shstrndx > pEhdr->e_shnum)
1694	{
1695	Log(("RTLdrELF: %s: The section headers string table is out of bounds! e_shstrndx=" FMT_ELF_HALF " e_shnum=" FMT_ELF_HALF "\n",
1696	pszLogName, pEhdr->e_shstrndx, pEhdr->e_shnum));
1697	return VERR_BAD_EXE_FORMAT;
1698	}
1699
1700	return VINF_SUCCESS;
1701	}
1702
1703	/**
1704	* Gets the section header name.
1705	*
1706	* @returns pszName.
1707	* @param pEhdr The elf header.
1708	* @param offName The offset of the section header name.
1709	* @param pszName Where to store the name.
1710	* @param cbName The size of the buffer pointed to by pszName.
1711	*/
1712	const char RTLDRELF_NAME(GetSHdrName)(PRTLDRMODELF pModElf, Elf_Word offName, char pszName, size_t cbName)
1713	{
1714	RTFOFF off = pModElf->paShdrs[pModElf->Ehdr.e_shstrndx].sh_offset + offName;
1715	int rc = pModElf->Core.pReader->pfnRead(pModElf->Core.pReader, pszName, cbName - 1, off);
1716	if (RT_FAILURE(rc))
1717	{
1718	/* read by for byte. */
1719	for (unsigned i = 0; i < cbName; i++, off++)
1720	{
1721	rc = pModElf->Core.pReader->pfnRead(pModElf->Core.pReader, pszName + i, 1, off);
1722	if (RT_FAILURE(rc))
1723	{
1724	pszName[i] = '\0';
1725	break;
1726	}
1727	}
1728	}
1729
1730	pszName[cbName - 1] = '\0';
1731	return pszName;
1732	}
1733
1734
1735	/**
1736	* Validates a section header.
1737	*
1738	* @returns iprt status code.
1739	* @param pModElf Pointer to the module structure.
1740	* @param iShdr The index of section header which should be validated.
1741	* The section headers are found in the pModElf->paShdrs array.
1742	* @param pszLogName The log name.
1743	* @param cbRawImage The size of the raw image.
1744	*/
1745	static int RTLDRELF_NAME(ValidateSectionHeader)(PRTLDRMODELF pModElf, unsigned iShdr, const char *pszLogName, uint64_t cbRawImage)
1746	{
1747	const Elf_Shdr *pShdr = &pModElf->paShdrs[iShdr];
1748	char szSectionName[80]; NOREF(szSectionName);
1749	Log3(("RTLdrELF: Section Header #%d:\n"
1750	"RTLdrELF: sh_name: " FMT_ELF_WORD " - %s\n"
1751	"RTLdrELF: sh_type: " FMT_ELF_WORD " (%s)\n"
1752	"RTLdrELF: sh_flags: " FMT_ELF_XWORD "\n"
1753	"RTLdrELF: sh_addr: " FMT_ELF_ADDR "\n"
1754	"RTLdrELF: sh_offset: " FMT_ELF_OFF "\n"
1755	"RTLdrELF: sh_size: " FMT_ELF_XWORD "\n"
1756	"RTLdrELF: sh_link: " FMT_ELF_WORD "\n"
1757	"RTLdrELF: sh_info: " FMT_ELF_WORD "\n"
1758	"RTLdrELF: sh_addralign: " FMT_ELF_XWORD "\n"
1759	"RTLdrELF: sh_entsize: " FMT_ELF_XWORD "\n",
1760	iShdr,
1761	pShdr->sh_name, RTLDRELF_NAME(GetSHdrName)(pModElf, pShdr->sh_name, szSectionName, sizeof(szSectionName)),
1762	pShdr->sh_type, rtldrElfGetShdrType(pShdr->sh_type), pShdr->sh_flags, pShdr->sh_addr,
1763	pShdr->sh_offset, pShdr->sh_size, pShdr->sh_link, pShdr->sh_info, pShdr->sh_addralign,
1764	pShdr->sh_entsize));
1765
1766	if (iShdr == 0)
1767	{
1768	if ( pShdr->sh_name != 0
1769	\|\| pShdr->sh_type != SHT_NULL
1770	\|\| pShdr->sh_flags != 0
1771	\|\| pShdr->sh_addr != 0
1772	\|\| pShdr->sh_size != 0
1773	\|\| pShdr->sh_offset != 0
1774	\|\| pShdr->sh_link != SHN_UNDEF
1775	\|\| pShdr->sh_addralign != 0
1776	\|\| pShdr->sh_entsize != 0 )
1777	{
1778	Log(("RTLdrELF: %s: Bad #0 section: %.Rhxs\n", pszLogName, sizeof(pShdr), pShdr ));
1779	return VERR_BAD_EXE_FORMAT;
1780	}
1781	return VINF_SUCCESS;
1782	}
1783
1784	if (pShdr->sh_name >= pModElf->cbShStr)
1785	{
1786	Log(("RTLdrELF: %s: Shdr #%d: sh_name (%d) is beyond the end of the section header string table (%d)!\n",
1787	pszLogName, iShdr, pShdr->sh_name, pModElf->cbShStr)); NOREF(pszLogName);
1788	return VERR_BAD_EXE_FORMAT;
1789	}
1790
1791	if (pShdr->sh_link >= pModElf->Ehdr.e_shnum)
1792	{
1793	Log(("RTLdrELF: %s: Shdr #%d: sh_link (%d) is beyond the end of the section table (%d)!\n",
1794	pszLogName, iShdr, pShdr->sh_link, pModElf->Ehdr.e_shnum)); NOREF(pszLogName);
1795	return VERR_BAD_EXE_FORMAT;
1796	}
1797
1798	switch (pShdr->sh_type)
1799	{
1800	/** @todo find specs and check up which sh_info fields indicates section table entries */
1801	case 12301230:
1802	if (pShdr->sh_info >= pModElf->Ehdr.e_shnum)
1803	{
1804	Log(("RTLdrELF: %s: Shdr #%d: sh_info (%d) is beyond the end of the section table (%d)!\n",
1805	pszLogName, iShdr, pShdr->sh_link, pModElf->Ehdr.e_shnum));
1806	return VERR_BAD_EXE_FORMAT;
1807	}
1808	break;
1809
1810	case SHT_NULL:
1811	break;
1812	case SHT_PROGBITS:
1813	case SHT_SYMTAB:
1814	case SHT_STRTAB:
1815	case SHT_RELA:
1816	case SHT_HASH:
1817	case SHT_DYNAMIC:
1818	case SHT_NOTE:
1819	case SHT_NOBITS:
1820	case SHT_REL:
1821	case SHT_SHLIB:
1822	case SHT_DYNSYM:
1823	/*
1824	* For these types sh_info doesn't have any special meaning, or anything which
1825	* we need/can validate now.
1826	*/
1827	break;
1828
1829
1830	default:
1831	Log(("RTLdrELF: %s: Warning, unknown type %d!\n", pszLogName, pShdr->sh_type));
1832	break;
1833	}
1834
1835	if ( pShdr->sh_type != SHT_NOBITS
1836	&& pShdr->sh_size)
1837	{
1838	uint64_t offEnd = pShdr->sh_offset + pShdr->sh_size;
1839	if ( offEnd > cbRawImage
1840	\|\| offEnd < (uint64_t)pShdr->sh_offset)
1841	{
1842	Log(("RTLdrELF: %s: Shdr #%d: sh_offset (" FMT_ELF_OFF ") + sh_size (" FMT_ELF_XWORD " = %RX64) is beyond the end of the file (%RX64)!\n",
1843	pszLogName, iShdr, pShdr->sh_offset, pShdr->sh_size, offEnd, cbRawImage));
1844	return VERR_BAD_EXE_FORMAT;
1845	}
1846	if (pShdr->sh_offset < sizeof(Elf_Ehdr))
1847	{
1848	Log(("RTLdrELF: %s: Shdr #%d: sh_offset (" FMT_ELF_OFF ") + sh_size (" FMT_ELF_XWORD ") is starting in the ELF header!\n",
1849	pszLogName, iShdr, pShdr->sh_offset, pShdr->sh_size));
1850	return VERR_BAD_EXE_FORMAT;
1851	}
1852	}
1853
1854	return VINF_SUCCESS;
1855	}
1856
1857
1858
1859	/**
1860	* Opens an ELF image, fixed bitness.
1861	*
1862	* @returns iprt status code.
1863	* @param pReader The loader reader instance which will provide the raw image bits.
1864	* @param fFlags Reserved, MBZ.
1865	* @param enmArch Architecture specifier.
1866	* @param phLdrMod Where to store the handle.
1867	*/
1868	static int RTLDRELF_NAME(Open)(PRTLDRREADER pReader, uint32_t fFlags, RTLDRARCH enmArch, PRTLDRMOD phLdrMod)
1869	{
1870	const char *pszLogName = pReader->pfnLogName(pReader);
1871	uint64_t cbRawImage = pReader->pfnSize(pReader);
1872	RT_NOREF_PV(fFlags);
1873
1874	/*
1875	* Create the loader module instance.
1876	*/
1877	PRTLDRMODELF pModElf = (PRTLDRMODELF)RTMemAllocZ(sizeof(*pModElf));
1878	if (!pModElf)
1879	return VERR_NO_MEMORY;
1880
1881	pModElf->Core.u32Magic = RTLDRMOD_MAGIC;
1882	pModElf->Core.eState = LDR_STATE_INVALID;
1883	pModElf->Core.pReader = pReader;
1884	pModElf->Core.enmFormat = RTLDRFMT_ELF;
1885	pModElf->Core.enmType = RTLDRTYPE_OBJECT;
1886	pModElf->Core.enmEndian = RTLDRENDIAN_LITTLE;
1887	#if ELF_MODE == 32
1888	pModElf->Core.enmArch = RTLDRARCH_X86_32;
1889	#else
1890	pModElf->Core.enmArch = RTLDRARCH_AMD64;
1891	#endif
1892	//pModElf->pvBits = NULL;
1893	//pModElf->Ehdr = {0};
1894	//pModElf->paShdrs = NULL;
1895	//pModElf->paSyms = NULL;
1896	pModElf->iSymSh = ~0U;
1897	//pModElf->cSyms = 0;
1898	pModElf->iStrSh = ~0U;
1899	//pModElf->cbStr = 0;
1900	//pModElf->cbImage = 0;
1901	//pModElf->LinkAddress = 0;
1902	//pModElf->pStr = NULL;
1903	//pModElf->cbShStr = 0;
1904	//pModElf->pShStr = NULL;
1905	//pModElf->iShEhFrame = 0;
1906	//pModElf->iShEhFrameHdr = 0;
1907
1908	/*
1909	* Read and validate the ELF header and match up the CPU architecture.
1910	*/
1911	int rc = pReader->pfnRead(pReader, &pModElf->Ehdr, sizeof(pModElf->Ehdr), 0);
1912	if (RT_SUCCESS(rc))
1913	{
1914	RTLDRARCH enmArchImage = RTLDRARCH_INVALID; /* shut up gcc */
1915	rc = RTLDRELF_NAME(ValidateElfHeader)(&pModElf->Ehdr, pszLogName, cbRawImage, &enmArchImage);
1916	if (RT_SUCCESS(rc))
1917	{
1918	if ( enmArch != RTLDRARCH_WHATEVER
1919	&& enmArch != enmArchImage)
1920	rc = VERR_LDR_ARCH_MISMATCH;
1921	}
1922	}
1923	if (RT_SUCCESS(rc))
1924	{
1925	/*
1926	* Read the section headers, keeping a prestine copy for the module
1927	* introspection methods.
1928	*/
1929	size_t const cbShdrs = pModElf->Ehdr.e_shnum * sizeof(Elf_Shdr);
1930	Elf_Shdr paShdrs = (Elf_Shdr )RTMemAlloc(cbShdrs * 2);
1931	if (paShdrs)
1932	{
1933	pModElf->paShdrs = paShdrs;
1934	rc = pReader->pfnRead(pReader, paShdrs, cbShdrs, pModElf->Ehdr.e_shoff);
1935	if (RT_SUCCESS(rc))
1936	{
1937	memcpy(&paShdrs[pModElf->Ehdr.e_shnum], paShdrs, cbShdrs);
1938	pModElf->paOrgShdrs = &paShdrs[pModElf->Ehdr.e_shnum];
1939
1940	pModElf->cbShStr = paShdrs[pModElf->Ehdr.e_shstrndx].sh_size;
1941
1942	/*
1943	* Validate the section headers and find relevant sections.
1944	*/
1945	Elf_Addr uNextAddr = 0;
1946	for (unsigned i = 0; i < pModElf->Ehdr.e_shnum; i++)
1947	{
1948	rc = RTLDRELF_NAME(ValidateSectionHeader)(pModElf, i, pszLogName, cbRawImage);
1949	if (RT_FAILURE(rc))
1950	break;
1951
1952	/* We're looking for symbol tables. */
1953	if (paShdrs[i].sh_type == SHT_SYMTAB)
1954	{
1955	if (pModElf->iSymSh != ~0U)
1956	{
1957	Log(("RTLdrElf: %s: Multiple symbol tabs! iSymSh=%d i=%d\n", pszLogName, pModElf->iSymSh, i));
1958	rc = VERR_LDRELF_MULTIPLE_SYMTABS;
1959	break;
1960	}
1961	pModElf->iSymSh = i;
1962	pModElf->cSyms = (unsigned)(paShdrs[i].sh_size / sizeof(Elf_Sym));
1963	AssertBreakStmt(pModElf->cSyms == paShdrs[i].sh_size / sizeof(Elf_Sym), rc = VERR_IMAGE_TOO_BIG);
1964	pModElf->iStrSh = paShdrs[i].sh_link;
1965	pModElf->cbStr = (unsigned)paShdrs[pModElf->iStrSh].sh_size;
1966	AssertBreakStmt(pModElf->cbStr == paShdrs[pModElf->iStrSh].sh_size, rc = VERR_IMAGE_TOO_BIG);
1967	}
1968
1969	/* Special checks for the section string table. */
1970	if (i == pModElf->Ehdr.e_shstrndx)
1971	{
1972	if (paShdrs[i].sh_type != SHT_STRTAB)
1973	{
1974	Log(("RTLdrElf: Section header string table is not a SHT_STRTAB: %#x\n", paShdrs[i].sh_type));
1975	rc = VERR_BAD_EXE_FORMAT;
1976	break;
1977	}
1978	if (paShdrs[i].sh_size == 0)
1979	{
1980	Log(("RTLdrElf: Section header string table is empty\n"));
1981	rc = VERR_BAD_EXE_FORMAT;
1982	break;
1983	}
1984	}
1985
1986	/* Kluge for the .data..percpu segment in 64-bit linux kernels. */
1987	if (paShdrs[i].sh_flags & SHF_ALLOC)
1988	{
1989	if ( paShdrs[i].sh_addr == 0
1990	&& paShdrs[i].sh_addr < uNextAddr)
1991	{
1992	Elf_Addr uAddr = RT_ALIGN_T(uNextAddr, paShdrs[i].sh_addralign, Elf_Addr);
1993	Log(("RTLdrElf: Out of order section #%d; adjusting sh_addr from " FMT_ELF_ADDR " to " FMT_ELF_ADDR "\n",
1994	i, paShdrs[i].sh_addr, uAddr));
1995	paShdrs[i].sh_addr = uAddr;
1996	}
1997	uNextAddr = paShdrs[i].sh_addr + paShdrs[i].sh_size;
1998	}
1999	} /* for each section header */
2000
2001	/*
2002	* Calculate the image base address if the image isn't relocatable.
2003	*/
2004	if (RT_SUCCESS(rc) && pModElf->Ehdr.e_type != ET_REL)
2005	{
2006	pModElf->LinkAddress = ~(Elf_Addr)0;
2007	for (unsigned i = 0; i < pModElf->Ehdr.e_shnum; i++)
2008	if ( (paShdrs[i].sh_flags & SHF_ALLOC)
2009	&& paShdrs[i].sh_addr < pModElf->LinkAddress)
2010	pModElf->LinkAddress = paShdrs[i].sh_addr;
2011	if (pModElf->LinkAddress == ~(Elf_Addr)0)
2012	{
2013	AssertFailed();
2014	rc = VERR_LDR_GENERAL_FAILURE;
2015	}
2016	if (pModElf->Ehdr.e_type == ET_DYN && pModElf->LinkAddress < 0x1000)
2017	pModElf->LinkAddress = 0;
2018	}
2019
2020	/*
2021	* Perform allocations / RVA calculations, determine the image size.
2022	*/
2023	if (RT_SUCCESS(rc))
2024	for (unsigned i = 0; i < pModElf->Ehdr.e_shnum; i++)
2025	if (paShdrs[i].sh_flags & SHF_ALLOC)
2026	{
2027	if (pModElf->Ehdr.e_type == ET_REL)
2028	paShdrs[i].sh_addr = paShdrs[i].sh_addralign
2029	? RT_ALIGN_T(pModElf->cbImage, paShdrs[i].sh_addralign, Elf_Addr)
2030	: (Elf_Addr)pModElf->cbImage;
2031	else
2032	paShdrs[i].sh_addr -= pModElf->LinkAddress;
2033	Elf_Addr EndAddr = paShdrs[i].sh_addr + paShdrs[i].sh_size;
2034	if (pModElf->cbImage < EndAddr)
2035	{
2036	pModElf->cbImage = (size_t)EndAddr;
2037	AssertMsgBreakStmt(pModElf->cbImage == EndAddr, (FMT_ELF_ADDR "\n", EndAddr), rc = VERR_IMAGE_TOO_BIG);
2038	}
2039	Log2(("RTLdrElf: %s: Assigned " FMT_ELF_ADDR " to section #%d\n", pszLogName, paShdrs[i].sh_addr, i));
2040	}
2041
2042	Log2(("RTLdrElf: iSymSh=%u cSyms=%u iStrSh=%u cbStr=%u rc=%Rrc cbImage=%#zx LinkAddress=" FMT_ELF_ADDR "\n",
2043	pModElf->iSymSh, pModElf->cSyms, pModElf->iStrSh, pModElf->cbStr, rc,
2044	pModElf->cbImage, pModElf->LinkAddress));
2045	if (RT_SUCCESS(rc))
2046	{
2047	pModElf->Core.pOps = &RTLDRELF_MID(s_rtldrElf,Ops);
2048	pModElf->Core.eState = LDR_STATE_OPENED;
2049	*phLdrMod = &pModElf->Core;
2050
2051	LogFlow(("%s: %s: returns VINF_SUCCESS phLdrMod=%p\n", __FUNCTION__, pszLogName, phLdrMod));
2052	return VINF_SUCCESS;
2053	}
2054	}
2055
2056	RTMemFree(paShdrs);
2057	}
2058	else
2059	rc = VERR_NO_MEMORY;
2060	}
2061
2062	RTMemFree(pModElf);
2063	LogFlow(("%s: returns %Rrc\n", __FUNCTION__, rc));
2064	return rc;
2065	}
2066
2067
2068
2069
2070	/*******************************************************************************
2071	* Cleanup Constants And Macros *
2072	*******************************************************************************/
2073	#undef RTLDRELF_NAME
2074	#undef RTLDRELF_SUFF
2075	#undef RTLDRELF_MID
2076
2077	#undef FMT_ELF_ADDR
2078	#undef FMT_ELF_HALF
2079	#undef FMT_ELF_SHALF
2080	#undef FMT_ELF_OFF
2081	#undef FMT_ELF_SIZE
2082	#undef FMT_ELF_SWORD
2083	#undef FMT_ELF_WORD
2084	#undef FMT_ELF_XWORD
2085	#undef FMT_ELF_SXWORD
2086
2087	#undef Elf_Ehdr
2088	#undef Elf_Phdr
2089	#undef Elf_Shdr
2090	#undef Elf_Sym
2091	#undef Elf_Rel
2092	#undef Elf_Rela
2093	#undef Elf_Reloc
2094	#undef Elf_Nhdr
2095	#undef Elf_Dyn
2096
2097	#undef Elf_Addr
2098	#undef Elf_Half
2099	#undef Elf_Off
2100	#undef Elf_Size
2101	#undef Elf_Sword
2102	#undef Elf_Word
2103
2104	#undef RTLDRMODELF
2105	#undef PRTLDRMODELF
2106
2107	#undef ELF_R_SYM
2108	#undef ELF_R_TYPE
2109	#undef ELF_R_INFO
2110
2111	#undef ELF_ST_BIND
2112

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source: vbox/trunk/src/VBox/Runtime/common/ldr/ldrELFRelocatable.cpp.h@ 80346

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