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