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cf76e892 JPM |
1 | // |
2 | // ELFManager.cpp: ELF format manager | |
3 | // | |
4 | // by Jean-Paul Mari | |
5 | // | |
6 | // JPM = Jean-Paul Mari <djipi.mari@gmail.com> | |
7 | // | |
8 | // WHO WHEN WHAT | |
9 | // --- ---------- ------------------------------------------------------------ | |
4f945aea JPM |
10 | // JPM Jan./2016 Created this file and added ELF format support |
11 | // JPM 07/13/2017 ELF DWARF format support improvement | |
12 | // JPM 10/20/2018 Added function name support from ELF structure | |
c3b14e59 | 13 | // JPM 03/13/2020 Added ELF & DWARF .debug* types |
cf76e892 JPM |
14 | // |
15 | ||
16 | #include <stdlib.h> | |
17 | #include <string.h> | |
009df4d7 JPM |
18 | #include <sys/types.h> |
19 | #include <sys/stat.h> | |
5fe21518 JPM |
20 | #include "libelf/libelf.h" |
21 | #include "libelf/gelf.h" | |
cf76e892 JPM |
22 | #include "libdwarf.h" |
23 | #include "log.h" | |
24 | #include "ELFManager.h" | |
25 | #include "DwarfManager.h" | |
26 | ||
27 | ||
4f945aea JPM |
28 | //#define LOG_SUPPORT // Support log |
29 | ||
30 | ||
cf76e892 JPM |
31 | typedef struct { |
32 | const char *SectionName; | |
33 | size_t SectionType; | |
34 | }ELFSectionType; | |
35 | ||
36 | typedef struct { | |
37 | size_t Type; | |
38 | size_t Size; | |
39 | union { | |
40 | Elf_Data *PtrDataTab; | |
41 | void *PtrTab; | |
42 | }; | |
43 | }ELFTab; | |
44 | ||
45 | ||
46 | // Section type list | |
47 | ELFSectionType ELFTabSectionType[] = { | |
48 | { "", ELF_NULL_TYPE }, | |
49 | { ".text", ELF_text_TYPE }, | |
50 | { ".rodata", ELF_rodata_TYPE }, | |
51 | { ".data", ELF_data_TYPE }, | |
52 | { ".bss", ELF_bss_TYPE }, | |
53 | { ".heap", ELF_heap_TYPE }, | |
c3b14e59 JPM |
54 | { ".debug", ELF_debug_TYPE }, |
55 | { ".comment", ELF_comment_TYPE }, | |
56 | { ".shstrtab", ELF_shstrtab_TYPE }, | |
57 | { ".symtab", ELF_symtab_TYPE }, | |
58 | { ".strtab", ELF_strtab_TYPE }, | |
59 | { ".debug_abbrev", ELF_debug_abbrev_TYPE }, | |
cf76e892 | 60 | { ".debug_aranges", ELF_debug_aranges_TYPE }, |
c3b14e59 | 61 | { ".debug_frame", ELF_debug_frame_TYPE }, |
cf76e892 | 62 | { ".debug_info", ELF_debug_info_TYPE }, |
cf76e892 | 63 | { ".debug_line", ELF_debug_line_TYPE }, |
cf76e892 | 64 | { ".debug_loc", ELF_debug_loc_TYPE }, |
c3b14e59 JPM |
65 | { ".debug_macinfo", ELF_debug_macinfo_TYPE }, |
66 | { ".debug_pubnames", ELF_debug_pubnames_TYPE }, | |
67 | { ".debug_pubtypes", ELF_debug_pubtypes_TYPE }, | |
cf76e892 | 68 | { ".debug_ranges", ELF_debug_ranges_TYPE }, |
c3b14e59 JPM |
69 | { ".debug_str", ELF_debug_str_TYPE }, |
70 | { ".debug_types", ELF_debug_types_TYPE } | |
cf76e892 JPM |
71 | }; |
72 | ||
73 | ||
74 | // ELF management | |
75 | Elf *ElfMem; | |
76 | void *PtrExec; // ELF executable | |
77 | ||
78 | // ELF Dwarf management | |
79 | bool ElfDwarf; | |
80 | ||
81 | // TAB structure | |
82 | size_t NbELFtabStruct; | |
83 | ELFTab **ELFtab; | |
84 | ||
85 | ||
86 | char *ELFManager_GetSymbolnameFromSymbolindex(size_t Index); | |
87 | ||
88 | ||
89 | // ELF section type detection | |
90 | size_t ELFManager_GetSectionType(char *SectionName) | |
91 | { | |
5fe21518 JPM |
92 | size_t i; |
93 | ||
94 | for (i = 0; i < ELF_END_TYPE; i++) | |
cf76e892 JPM |
95 | { |
96 | if (!strcmp(ELFTabSectionType[i].SectionName, SectionName)) | |
97 | { | |
98 | return (ELFTabSectionType[i].SectionType); | |
99 | } | |
100 | } | |
101 | ||
5fe21518 | 102 | return (size_t)ELF_NO_TYPE; |
cf76e892 JPM |
103 | } |
104 | ||
105 | ||
106 | // ELF manager executable copy | |
107 | void *ELFManager_ExeCopy(void *src, size_t size) | |
108 | { | |
109 | if ((PtrExec = malloc(size)) != NULL) | |
110 | { | |
111 | memcpy(PtrExec, src, size); | |
112 | } | |
113 | ||
114 | return PtrExec; | |
115 | } | |
116 | ||
117 | ||
118 | Elf *ELFManager_MemOpen(char *PtrELFExe, size_t Size) | |
119 | { | |
120 | return(ElfMem = elf_memory(PtrELFExe, Size)); | |
121 | } | |
122 | ||
123 | ||
124 | int ELFManager_MemEnd(void) | |
125 | { | |
126 | int err = 0; | |
127 | ||
128 | if (ElfMem) | |
129 | { | |
130 | err = elf_end(ElfMem); | |
131 | ElfMem = NULL; | |
132 | } | |
133 | ||
134 | return (err); | |
135 | } | |
136 | ||
137 | ||
138 | // ELF manager Initialisation | |
139 | void ELFManager_Init(void) | |
140 | { | |
141 | PtrExec = NULL; | |
142 | NbELFtabStruct = 0; | |
143 | ELFtab = NULL; | |
144 | ElfMem = NULL; | |
145 | ElfDwarf = false; | |
146 | } | |
147 | ||
148 | ||
149 | // ELF manager Dwarf Initialisation | |
009df4d7 | 150 | bool ELFManager_DwarfInit(Elf *PtrElfMem, struct _stat FileElfInfo) |
cf76e892 | 151 | { |
009df4d7 | 152 | return (ElfDwarf = (DWARFManager_ElfInit(PtrElfMem, FileElfInfo) == DW_DLV_OK) ? true : false); |
cf76e892 JPM |
153 | } |
154 | ||
155 | ||
156 | // ELF manager Reset | |
157 | void ELFManager_Reset(void) | |
158 | { | |
159 | if (ElfDwarf) | |
160 | { | |
161 | DWARFManager_Reset(); | |
162 | ElfDwarf = false; | |
163 | } | |
164 | ||
165 | if (PtrExec != NULL) | |
166 | { | |
167 | free(PtrExec); | |
168 | PtrExec = NULL; | |
169 | } | |
170 | ||
171 | if (ELFtab != NULL) | |
172 | { | |
173 | while (NbELFtabStruct) | |
174 | { | |
175 | free(ELFtab[--NbELFtabStruct]); | |
176 | } | |
177 | ||
178 | free(ELFtab); | |
179 | ELFtab = NULL; | |
180 | } | |
181 | ||
182 | ELFManager_MemEnd(); | |
183 | } | |
184 | ||
185 | ||
186 | // ELF manager Closing | |
187 | void ELFManager_Close(void) | |
188 | { | |
189 | ELFManager_Reset(); | |
190 | } | |
191 | ||
192 | ||
193 | // Save the ELF tab in memory | |
194 | bool ELFManager_AddTab(void *Ptr, size_t type) | |
195 | { | |
196 | if (!NbELFtabStruct) | |
197 | { | |
198 | if ((ELFtab = (ELFTab **)calloc(1, sizeof(ELFTab *))) == NULL) | |
199 | { | |
200 | return false; | |
201 | } | |
202 | } | |
203 | else | |
204 | { | |
205 | if ((ELFtab = (ELFTab **)realloc(ELFtab, sizeof(ELFTab *)*(NbELFtabStruct+1))) == NULL) | |
206 | { | |
207 | return false; | |
208 | } | |
209 | } | |
210 | ||
211 | if ((ELFtab[NbELFtabStruct] = (ELFTab *)calloc(1, sizeof(ELFTab))) == NULL) | |
212 | { | |
213 | return false; | |
214 | } | |
215 | else | |
216 | { | |
217 | ELFtab[NbELFtabStruct]->Type = type; | |
218 | ELFtab[NbELFtabStruct]->PtrTab = Ptr; | |
219 | NbELFtabStruct++; | |
220 | return true; | |
221 | } | |
222 | } | |
223 | ||
224 | ||
225 | // Get Address from his Symbol Name | |
226 | // Return 0 if Symbol name is not found | |
227 | size_t ELFManager_GetAdrFromSymbolName(char *SymbolName) | |
228 | { | |
229 | size_t Adr = 0; | |
230 | GElf_Sym *PtrST, ST; | |
231 | ||
a4e46c05 | 232 | if (ELFtab && SymbolName) |
cf76e892 JPM |
233 | { |
234 | for (size_t i = 0; i < NbELFtabStruct; i++) | |
235 | { | |
236 | if ((ELFtab[i]->Type == ELF_symtab_TYPE) && ((ELFtab[i]->PtrDataTab) != NULL)) | |
237 | { | |
238 | int j = 0; | |
239 | ||
240 | while ((PtrST = gelf_getsym(ELFtab[i]->PtrDataTab, j++, &ST)) != NULL) | |
241 | { | |
242 | if (!strcmp(ELFManager_GetSymbolnameFromSymbolindex(PtrST->st_name), SymbolName)) | |
243 | { | |
244 | Adr = PtrST->st_value; | |
245 | } | |
246 | } | |
247 | } | |
248 | } | |
249 | } | |
250 | ||
251 | return Adr; | |
252 | } | |
253 | ||
254 | ||
4f945aea JPM |
255 | // Get function name from his address |
256 | // Return NULL if function name is not found | |
257 | char *ELFManager_GetFunctionName(size_t Adr) | |
258 | { | |
259 | char *SymbolName = NULL; | |
260 | GElf_Sym *PtrST, ST; | |
261 | ||
262 | if (ELFtab != NULL) | |
263 | { | |
264 | for (size_t i = 0; i < NbELFtabStruct; i++) | |
265 | { | |
266 | if ((ELFtab[i]->Type == ELF_symtab_TYPE) && ((ELFtab[i]->PtrDataTab) != NULL)) | |
267 | { | |
268 | int j = 0; | |
269 | ||
270 | while ((PtrST = gelf_getsym(ELFtab[i]->PtrDataTab, j++, &ST)) != NULL) | |
271 | { | |
272 | if (PtrST->st_value == Adr) | |
273 | { | |
274 | if (ELF32_ST_TYPE(PtrST->st_info) == STT_FUNC) | |
275 | { | |
276 | SymbolName = ELFManager_GetSymbolnameFromSymbolindex(PtrST->st_name); | |
277 | } | |
278 | } | |
279 | } | |
280 | } | |
281 | } | |
282 | } | |
283 | ||
284 | return SymbolName; | |
285 | } | |
286 | ||
287 | ||
cf76e892 JPM |
288 | // Get Symbol name from his address |
289 | // Return NULL if Symbol name is not found | |
290 | char *ELFManager_GetSymbolnameFromAdr(size_t Adr) | |
291 | { | |
292 | char *SymbolName = NULL; | |
293 | GElf_Sym *PtrST, ST; | |
294 | ||
295 | if (ELFtab != NULL) | |
296 | { | |
297 | for (size_t i = 0; i < NbELFtabStruct; i++) | |
298 | { | |
299 | if ((ELFtab[i]->Type == ELF_symtab_TYPE) && ((ELFtab[i]->PtrDataTab) != NULL)) | |
300 | { | |
301 | int j = 0; | |
302 | ||
303 | while ((PtrST = gelf_getsym(ELFtab[i]->PtrDataTab, j++, &ST)) != NULL) | |
304 | { | |
305 | if (PtrST->st_value == Adr) | |
306 | { | |
4f945aea | 307 | #ifdef LOG_SUPPORT |
cf76e892 | 308 | WriteLog("ELF: .symtab: DATA: st_info=%0x, st_name=%0x, st_other=%0x, st_shndx=%0x, st_size=%0x, st_value=%0x\n", PtrST->st_info, PtrST->st_name, PtrST->st_other, PtrST->st_shndx, PtrST->st_size, PtrST->st_value); |
4f945aea | 309 | #endif |
cf76e892 JPM |
310 | SymbolName = ELFManager_GetSymbolnameFromSymbolindex(PtrST->st_name); |
311 | } | |
312 | } | |
313 | } | |
314 | } | |
315 | } | |
316 | ||
317 | return SymbolName; | |
318 | } | |
319 | ||
320 | ||
321 | // Get Symbol name from his Symbol index | |
322 | char *ELFManager_GetSymbolnameFromSymbolindex(size_t Index) | |
323 | { | |
324 | if (ELFtab != NULL) | |
325 | { | |
326 | for (size_t i = 0; i < NbELFtabStruct; i++) | |
327 | { | |
328 | if ((ELFtab[i]->Type == ELF_strtab_TYPE) && ((ELFtab[i]->PtrDataTab) != NULL)) | |
329 | { | |
330 | return ((char *)(ELFtab[i]->PtrDataTab->d_buf) + Index); | |
331 | } | |
332 | } | |
333 | } | |
334 | ||
335 | return NULL; | |
336 | } |