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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> | |
c4fe5864 | 7 | // RG = Richard Goedeken |
cf76e892 JPM |
8 | // |
9 | // WHO WHEN WHAT | |
10 | // --- ---------- ------------------------------------------------------------ | |
4f945aea JPM |
11 | // JPM Jan./2016 Created this file and added ELF format support |
12 | // JPM 07/13/2017 ELF DWARF format support improvement | |
13 | // JPM 10/20/2018 Added function name support from ELF structure | |
c3b14e59 | 14 | // JPM 03/13/2020 Added ELF & DWARF .debug* types |
c4fe5864 | 15 | // RG Jan./2021 Linux build fixes |
cf76e892 JPM |
16 | // |
17 | ||
18 | #include <stdlib.h> | |
19 | #include <string.h> | |
009df4d7 JPM |
20 | #include <sys/types.h> |
21 | #include <sys/stat.h> | |
c89f8ff7 RG |
22 | #include "libelf.h" |
23 | #include "gelf.h" | |
cf76e892 JPM |
24 | #include "libdwarf.h" |
25 | #include "log.h" | |
26 | #include "ELFManager.h" | |
c89f8ff7 | 27 | #include "DWARFManager.h" |
cf76e892 JPM |
28 | |
29 | ||
4f945aea JPM |
30 | //#define LOG_SUPPORT // Support log |
31 | ||
32 | ||
cf76e892 JPM |
33 | typedef struct { |
34 | const char *SectionName; | |
35 | size_t SectionType; | |
36 | }ELFSectionType; | |
37 | ||
38 | typedef struct { | |
39 | size_t Type; | |
40 | size_t Size; | |
41 | union { | |
42 | Elf_Data *PtrDataTab; | |
43 | void *PtrTab; | |
44 | }; | |
45 | }ELFTab; | |
46 | ||
47 | ||
48 | // Section type list | |
49 | ELFSectionType ELFTabSectionType[] = { | |
50 | { "", ELF_NULL_TYPE }, | |
51 | { ".text", ELF_text_TYPE }, | |
52 | { ".rodata", ELF_rodata_TYPE }, | |
53 | { ".data", ELF_data_TYPE }, | |
54 | { ".bss", ELF_bss_TYPE }, | |
55 | { ".heap", ELF_heap_TYPE }, | |
c3b14e59 JPM |
56 | { ".debug", ELF_debug_TYPE }, |
57 | { ".comment", ELF_comment_TYPE }, | |
58 | { ".shstrtab", ELF_shstrtab_TYPE }, | |
59 | { ".symtab", ELF_symtab_TYPE }, | |
60 | { ".strtab", ELF_strtab_TYPE }, | |
61 | { ".debug_abbrev", ELF_debug_abbrev_TYPE }, | |
cf76e892 | 62 | { ".debug_aranges", ELF_debug_aranges_TYPE }, |
c3b14e59 | 63 | { ".debug_frame", ELF_debug_frame_TYPE }, |
cf76e892 | 64 | { ".debug_info", ELF_debug_info_TYPE }, |
cf76e892 | 65 | { ".debug_line", ELF_debug_line_TYPE }, |
cf76e892 | 66 | { ".debug_loc", ELF_debug_loc_TYPE }, |
c3b14e59 JPM |
67 | { ".debug_macinfo", ELF_debug_macinfo_TYPE }, |
68 | { ".debug_pubnames", ELF_debug_pubnames_TYPE }, | |
69 | { ".debug_pubtypes", ELF_debug_pubtypes_TYPE }, | |
cf76e892 | 70 | { ".debug_ranges", ELF_debug_ranges_TYPE }, |
c3b14e59 JPM |
71 | { ".debug_str", ELF_debug_str_TYPE }, |
72 | { ".debug_types", ELF_debug_types_TYPE } | |
cf76e892 JPM |
73 | }; |
74 | ||
75 | ||
76 | // ELF management | |
77 | Elf *ElfMem; | |
78 | void *PtrExec; // ELF executable | |
79 | ||
80 | // ELF Dwarf management | |
81 | bool ElfDwarf; | |
82 | ||
83 | // TAB structure | |
84 | size_t NbELFtabStruct; | |
85 | ELFTab **ELFtab; | |
86 | ||
87 | ||
88 | char *ELFManager_GetSymbolnameFromSymbolindex(size_t Index); | |
89 | ||
90 | ||
91 | // ELF section type detection | |
92 | size_t ELFManager_GetSectionType(char *SectionName) | |
93 | { | |
5fe21518 JPM |
94 | size_t i; |
95 | ||
96 | for (i = 0; i < ELF_END_TYPE; i++) | |
cf76e892 JPM |
97 | { |
98 | if (!strcmp(ELFTabSectionType[i].SectionName, SectionName)) | |
99 | { | |
100 | return (ELFTabSectionType[i].SectionType); | |
101 | } | |
102 | } | |
103 | ||
5fe21518 | 104 | return (size_t)ELF_NO_TYPE; |
cf76e892 JPM |
105 | } |
106 | ||
107 | ||
108 | // ELF manager executable copy | |
109 | void *ELFManager_ExeCopy(void *src, size_t size) | |
110 | { | |
111 | if ((PtrExec = malloc(size)) != NULL) | |
112 | { | |
113 | memcpy(PtrExec, src, size); | |
114 | } | |
115 | ||
116 | return PtrExec; | |
117 | } | |
118 | ||
119 | ||
120 | Elf *ELFManager_MemOpen(char *PtrELFExe, size_t Size) | |
121 | { | |
122 | return(ElfMem = elf_memory(PtrELFExe, Size)); | |
123 | } | |
124 | ||
125 | ||
126 | int ELFManager_MemEnd(void) | |
127 | { | |
128 | int err = 0; | |
129 | ||
130 | if (ElfMem) | |
131 | { | |
132 | err = elf_end(ElfMem); | |
133 | ElfMem = NULL; | |
134 | } | |
135 | ||
136 | return (err); | |
137 | } | |
138 | ||
139 | ||
140 | // ELF manager Initialisation | |
141 | void ELFManager_Init(void) | |
142 | { | |
143 | PtrExec = NULL; | |
144 | NbELFtabStruct = 0; | |
145 | ELFtab = NULL; | |
146 | ElfMem = NULL; | |
147 | ElfDwarf = false; | |
148 | } | |
149 | ||
150 | ||
151 | // ELF manager Dwarf Initialisation | |
c89f8ff7 | 152 | bool ELFManager_DwarfInit(Elf *PtrElfMem, struct stat FileElfInfo) |
cf76e892 | 153 | { |
009df4d7 | 154 | return (ElfDwarf = (DWARFManager_ElfInit(PtrElfMem, FileElfInfo) == DW_DLV_OK) ? true : false); |
cf76e892 JPM |
155 | } |
156 | ||
157 | ||
158 | // ELF manager Reset | |
159 | void ELFManager_Reset(void) | |
160 | { | |
161 | if (ElfDwarf) | |
162 | { | |
163 | DWARFManager_Reset(); | |
164 | ElfDwarf = false; | |
165 | } | |
166 | ||
167 | if (PtrExec != NULL) | |
168 | { | |
169 | free(PtrExec); | |
170 | PtrExec = NULL; | |
171 | } | |
172 | ||
173 | if (ELFtab != NULL) | |
174 | { | |
175 | while (NbELFtabStruct) | |
176 | { | |
177 | free(ELFtab[--NbELFtabStruct]); | |
178 | } | |
179 | ||
180 | free(ELFtab); | |
181 | ELFtab = NULL; | |
182 | } | |
183 | ||
184 | ELFManager_MemEnd(); | |
185 | } | |
186 | ||
187 | ||
188 | // ELF manager Closing | |
189 | void ELFManager_Close(void) | |
190 | { | |
191 | ELFManager_Reset(); | |
192 | } | |
193 | ||
194 | ||
195 | // Save the ELF tab in memory | |
196 | bool ELFManager_AddTab(void *Ptr, size_t type) | |
197 | { | |
198 | if (!NbELFtabStruct) | |
199 | { | |
200 | if ((ELFtab = (ELFTab **)calloc(1, sizeof(ELFTab *))) == NULL) | |
201 | { | |
202 | return false; | |
203 | } | |
204 | } | |
205 | else | |
206 | { | |
207 | if ((ELFtab = (ELFTab **)realloc(ELFtab, sizeof(ELFTab *)*(NbELFtabStruct+1))) == NULL) | |
208 | { | |
209 | return false; | |
210 | } | |
211 | } | |
212 | ||
213 | if ((ELFtab[NbELFtabStruct] = (ELFTab *)calloc(1, sizeof(ELFTab))) == NULL) | |
214 | { | |
215 | return false; | |
216 | } | |
217 | else | |
218 | { | |
219 | ELFtab[NbELFtabStruct]->Type = type; | |
220 | ELFtab[NbELFtabStruct]->PtrTab = Ptr; | |
221 | NbELFtabStruct++; | |
222 | return true; | |
223 | } | |
224 | } | |
225 | ||
226 | ||
227 | // Get Address from his Symbol Name | |
228 | // Return 0 if Symbol name is not found | |
229 | size_t ELFManager_GetAdrFromSymbolName(char *SymbolName) | |
230 | { | |
231 | size_t Adr = 0; | |
232 | GElf_Sym *PtrST, ST; | |
233 | ||
a4e46c05 | 234 | if (ELFtab && SymbolName) |
cf76e892 JPM |
235 | { |
236 | for (size_t i = 0; i < NbELFtabStruct; i++) | |
237 | { | |
238 | if ((ELFtab[i]->Type == ELF_symtab_TYPE) && ((ELFtab[i]->PtrDataTab) != NULL)) | |
239 | { | |
240 | int j = 0; | |
241 | ||
242 | while ((PtrST = gelf_getsym(ELFtab[i]->PtrDataTab, j++, &ST)) != NULL) | |
243 | { | |
244 | if (!strcmp(ELFManager_GetSymbolnameFromSymbolindex(PtrST->st_name), SymbolName)) | |
245 | { | |
246 | Adr = PtrST->st_value; | |
247 | } | |
248 | } | |
249 | } | |
250 | } | |
251 | } | |
252 | ||
253 | return Adr; | |
254 | } | |
255 | ||
256 | ||
4f945aea JPM |
257 | // Get function name from his address |
258 | // Return NULL if function name is not found | |
259 | char *ELFManager_GetFunctionName(size_t Adr) | |
260 | { | |
261 | char *SymbolName = NULL; | |
262 | GElf_Sym *PtrST, ST; | |
263 | ||
264 | if (ELFtab != NULL) | |
265 | { | |
266 | for (size_t i = 0; i < NbELFtabStruct; i++) | |
267 | { | |
268 | if ((ELFtab[i]->Type == ELF_symtab_TYPE) && ((ELFtab[i]->PtrDataTab) != NULL)) | |
269 | { | |
270 | int j = 0; | |
271 | ||
272 | while ((PtrST = gelf_getsym(ELFtab[i]->PtrDataTab, j++, &ST)) != NULL) | |
273 | { | |
274 | if (PtrST->st_value == Adr) | |
275 | { | |
276 | if (ELF32_ST_TYPE(PtrST->st_info) == STT_FUNC) | |
277 | { | |
278 | SymbolName = ELFManager_GetSymbolnameFromSymbolindex(PtrST->st_name); | |
279 | } | |
280 | } | |
281 | } | |
282 | } | |
283 | } | |
284 | } | |
285 | ||
286 | return SymbolName; | |
287 | } | |
288 | ||
289 | ||
cf76e892 JPM |
290 | // Get Symbol name from his address |
291 | // Return NULL if Symbol name is not found | |
292 | char *ELFManager_GetSymbolnameFromAdr(size_t Adr) | |
293 | { | |
294 | char *SymbolName = NULL; | |
295 | GElf_Sym *PtrST, ST; | |
296 | ||
297 | if (ELFtab != NULL) | |
298 | { | |
299 | for (size_t i = 0; i < NbELFtabStruct; i++) | |
300 | { | |
301 | if ((ELFtab[i]->Type == ELF_symtab_TYPE) && ((ELFtab[i]->PtrDataTab) != NULL)) | |
302 | { | |
303 | int j = 0; | |
304 | ||
305 | while ((PtrST = gelf_getsym(ELFtab[i]->PtrDataTab, j++, &ST)) != NULL) | |
306 | { | |
307 | if (PtrST->st_value == Adr) | |
308 | { | |
4f945aea | 309 | #ifdef LOG_SUPPORT |
cf76e892 | 310 | 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 | 311 | #endif |
cf76e892 JPM |
312 | SymbolName = ELFManager_GetSymbolnameFromSymbolindex(PtrST->st_name); |
313 | } | |
314 | } | |
315 | } | |
316 | } | |
317 | } | |
318 | ||
319 | return SymbolName; | |
320 | } | |
321 | ||
322 | ||
323 | // Get Symbol name from his Symbol index | |
324 | char *ELFManager_GetSymbolnameFromSymbolindex(size_t Index) | |
325 | { | |
326 | if (ELFtab != NULL) | |
327 | { | |
328 | for (size_t i = 0; i < NbELFtabStruct; i++) | |
329 | { | |
330 | if ((ELFtab[i]->Type == ELF_strtab_TYPE) && ((ELFtab[i]->PtrDataTab) != NULL)) | |
331 | { | |
332 | return ((char *)(ELFtab[i]->PtrDataTab->d_buf) + Index); | |
333 | } | |
334 | } | |
335 | } | |
336 | ||
337 | return NULL; | |
338 | } |