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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 | // --- ---------- ------------------------------------------------------------ | |
10 | // JPM 12/01/2016 Created this file | |
11 | // JPM 12/01/2016 ELF format support | |
12 | // JPM 13/07/2017 ELF DWARF format support | |
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 | ||
25 | typedef struct { | |
26 | const char *SectionName; | |
27 | size_t SectionType; | |
28 | }ELFSectionType; | |
29 | ||
30 | typedef struct { | |
31 | size_t Type; | |
32 | size_t Size; | |
33 | union { | |
34 | Elf_Data *PtrDataTab; | |
35 | void *PtrTab; | |
36 | }; | |
37 | }ELFTab; | |
38 | ||
39 | ||
40 | // Section type list | |
41 | ELFSectionType ELFTabSectionType[] = { | |
42 | { "", ELF_NULL_TYPE }, | |
43 | { ".text", ELF_text_TYPE }, | |
44 | { ".rodata", ELF_rodata_TYPE }, | |
45 | { ".data", ELF_data_TYPE }, | |
46 | { ".bss", ELF_bss_TYPE }, | |
47 | { ".heap", ELF_heap_TYPE }, | |
48 | { ".debug_aranges", ELF_debug_aranges_TYPE }, | |
49 | { ".debug_info", ELF_debug_info_TYPE }, | |
50 | { ".debug_abbrev", ELF_debug_abbrev_TYPE }, | |
51 | { ".debug_line", ELF_debug_line_TYPE }, | |
52 | { ".debug_frame", ELF_debug_frame_TYPE }, | |
53 | { ".debug_str", ELF_debug_str_TYPE }, | |
54 | { ".debug_loc", ELF_debug_loc_TYPE }, | |
55 | { ".debug_ranges", ELF_debug_ranges_TYPE }, | |
56 | { ".comment", ELF_comment_TYPE }, | |
57 | { ".shstrtab", ELF_shstrtab_TYPE }, | |
58 | { ".symtab", ELF_symtab_TYPE }, | |
59 | { ".strtab", ELF_strtab_TYPE } | |
60 | }; | |
61 | ||
62 | ||
63 | // ELF management | |
64 | Elf *ElfMem; | |
65 | void *PtrExec; // ELF executable | |
66 | ||
67 | // ELF Dwarf management | |
68 | bool ElfDwarf; | |
69 | ||
70 | // TAB structure | |
71 | size_t NbELFtabStruct; | |
72 | ELFTab **ELFtab; | |
73 | ||
74 | ||
75 | char *ELFManager_GetSymbolnameFromSymbolindex(size_t Index); | |
76 | ||
77 | ||
78 | // ELF section type detection | |
79 | size_t ELFManager_GetSectionType(char *SectionName) | |
80 | { | |
5fe21518 JPM |
81 | size_t i; |
82 | ||
83 | for (i = 0; i < ELF_END_TYPE; i++) | |
cf76e892 JPM |
84 | { |
85 | if (!strcmp(ELFTabSectionType[i].SectionName, SectionName)) | |
86 | { | |
87 | return (ELFTabSectionType[i].SectionType); | |
88 | } | |
89 | } | |
90 | ||
5fe21518 | 91 | return (size_t)ELF_NO_TYPE; |
cf76e892 JPM |
92 | } |
93 | ||
94 | ||
95 | // ELF manager executable copy | |
96 | void *ELFManager_ExeCopy(void *src, size_t size) | |
97 | { | |
98 | if ((PtrExec = malloc(size)) != NULL) | |
99 | { | |
100 | memcpy(PtrExec, src, size); | |
101 | } | |
102 | ||
103 | return PtrExec; | |
104 | } | |
105 | ||
106 | ||
107 | Elf *ELFManager_MemOpen(char *PtrELFExe, size_t Size) | |
108 | { | |
109 | return(ElfMem = elf_memory(PtrELFExe, Size)); | |
110 | } | |
111 | ||
112 | ||
113 | int ELFManager_MemEnd(void) | |
114 | { | |
115 | int err = 0; | |
116 | ||
117 | if (ElfMem) | |
118 | { | |
119 | err = elf_end(ElfMem); | |
120 | ElfMem = NULL; | |
121 | } | |
122 | ||
123 | return (err); | |
124 | } | |
125 | ||
126 | ||
127 | // ELF manager Initialisation | |
128 | void ELFManager_Init(void) | |
129 | { | |
130 | PtrExec = NULL; | |
131 | NbELFtabStruct = 0; | |
132 | ELFtab = NULL; | |
133 | ElfMem = NULL; | |
134 | ElfDwarf = false; | |
135 | } | |
136 | ||
137 | ||
138 | // ELF manager Dwarf Initialisation | |
139 | bool ELFManager_DwarfInit(Elf *PtrElfMem) | |
140 | { | |
141 | return (ElfDwarf = (DWARFManager_ElfInit(PtrElfMem) == DW_DLV_OK) ? true : false); | |
142 | } | |
143 | ||
144 | ||
145 | // ELF manager Reset | |
146 | void ELFManager_Reset(void) | |
147 | { | |
148 | if (ElfDwarf) | |
149 | { | |
150 | DWARFManager_Reset(); | |
151 | ElfDwarf = false; | |
152 | } | |
153 | ||
154 | if (PtrExec != NULL) | |
155 | { | |
156 | free(PtrExec); | |
157 | PtrExec = NULL; | |
158 | } | |
159 | ||
160 | if (ELFtab != NULL) | |
161 | { | |
162 | while (NbELFtabStruct) | |
163 | { | |
164 | free(ELFtab[--NbELFtabStruct]); | |
165 | } | |
166 | ||
167 | free(ELFtab); | |
168 | ELFtab = NULL; | |
169 | } | |
170 | ||
171 | ELFManager_MemEnd(); | |
172 | } | |
173 | ||
174 | ||
175 | // ELF manager Closing | |
176 | void ELFManager_Close(void) | |
177 | { | |
178 | ELFManager_Reset(); | |
179 | } | |
180 | ||
181 | ||
182 | // Save the ELF tab in memory | |
183 | bool ELFManager_AddTab(void *Ptr, size_t type) | |
184 | { | |
185 | if (!NbELFtabStruct) | |
186 | { | |
187 | if ((ELFtab = (ELFTab **)calloc(1, sizeof(ELFTab *))) == NULL) | |
188 | { | |
189 | return false; | |
190 | } | |
191 | } | |
192 | else | |
193 | { | |
194 | if ((ELFtab = (ELFTab **)realloc(ELFtab, sizeof(ELFTab *)*(NbELFtabStruct+1))) == NULL) | |
195 | { | |
196 | return false; | |
197 | } | |
198 | } | |
199 | ||
200 | if ((ELFtab[NbELFtabStruct] = (ELFTab *)calloc(1, sizeof(ELFTab))) == NULL) | |
201 | { | |
202 | return false; | |
203 | } | |
204 | else | |
205 | { | |
206 | ELFtab[NbELFtabStruct]->Type = type; | |
207 | ELFtab[NbELFtabStruct]->PtrTab = Ptr; | |
208 | NbELFtabStruct++; | |
209 | return true; | |
210 | } | |
211 | } | |
212 | ||
213 | ||
214 | // Get Address from his Symbol Name | |
215 | // Return 0 if Symbol name is not found | |
216 | size_t ELFManager_GetAdrFromSymbolName(char *SymbolName) | |
217 | { | |
218 | size_t Adr = 0; | |
219 | GElf_Sym *PtrST, ST; | |
220 | ||
221 | if (ELFtab != NULL) | |
222 | { | |
223 | for (size_t i = 0; i < NbELFtabStruct; i++) | |
224 | { | |
225 | if ((ELFtab[i]->Type == ELF_symtab_TYPE) && ((ELFtab[i]->PtrDataTab) != NULL)) | |
226 | { | |
227 | int j = 0; | |
228 | ||
229 | while ((PtrST = gelf_getsym(ELFtab[i]->PtrDataTab, j++, &ST)) != NULL) | |
230 | { | |
231 | if (!strcmp(ELFManager_GetSymbolnameFromSymbolindex(PtrST->st_name), SymbolName)) | |
232 | { | |
233 | Adr = PtrST->st_value; | |
234 | } | |
235 | } | |
236 | } | |
237 | } | |
238 | } | |
239 | ||
240 | return Adr; | |
241 | } | |
242 | ||
243 | ||
244 | // Get Symbol name from his address | |
245 | // Return NULL if Symbol name is not found | |
246 | char *ELFManager_GetSymbolnameFromAdr(size_t Adr) | |
247 | { | |
248 | char *SymbolName = NULL; | |
249 | GElf_Sym *PtrST, ST; | |
250 | ||
251 | if (ELFtab != NULL) | |
252 | { | |
253 | for (size_t i = 0; i < NbELFtabStruct; i++) | |
254 | { | |
255 | if ((ELFtab[i]->Type == ELF_symtab_TYPE) && ((ELFtab[i]->PtrDataTab) != NULL)) | |
256 | { | |
257 | int j = 0; | |
258 | ||
259 | while ((PtrST = gelf_getsym(ELFtab[i]->PtrDataTab, j++, &ST)) != NULL) | |
260 | { | |
261 | if (PtrST->st_value == Adr) | |
262 | { | |
263 | 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); | |
264 | SymbolName = ELFManager_GetSymbolnameFromSymbolindex(PtrST->st_name); | |
265 | } | |
266 | } | |
267 | } | |
268 | } | |
269 | } | |
270 | ||
271 | return SymbolName; | |
272 | } | |
273 | ||
274 | ||
275 | // Get Symbol name from his Symbol index | |
276 | char *ELFManager_GetSymbolnameFromSymbolindex(size_t Index) | |
277 | { | |
278 | if (ELFtab != NULL) | |
279 | { | |
280 | for (size_t i = 0; i < NbELFtabStruct; i++) | |
281 | { | |
282 | if ((ELFtab[i]->Type == ELF_strtab_TYPE) && ((ELFtab[i]->PtrDataTab) != NULL)) | |
283 | { | |
284 | return ((char *)(ELFtab[i]->PtrDataTab->d_buf) + Index); | |
285 | } | |
286 | } | |
287 | } | |
288 | ||
289 | return NULL; | |
290 | } |