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