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Rev 2962 | Rev 2964 | ||
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Line 59... | Line 59... | ||
59 | "incompatible image", |
59 | "incompatible image", |
60 | "unsupported image type", |
60 | "unsupported image type", |
61 | "irrecoverable error" |
61 | "irrecoverable error" |
62 | }; |
62 | }; |
63 | 63 | ||
64 | static unsigned int elf_load(int fd, elf_header_t *header); |
64 | static unsigned int elf_load(elf_ld_t *elf); |
65 | static int segment_header(int fd, elf_header_t *elf); |
65 | static int segment_header(elf_ld_t *elf, elf_segment_header_t *entry); |
66 | static int section_header(int fd, elf_header_t *elf); |
66 | static int section_header(elf_ld_t *elf, elf_section_header_t *entry); |
67 | static int load_segment(int fd, elf_segment_header_t *entry, elf_header_t *elf); |
67 | static int load_segment(elf_ld_t *elf, elf_segment_header_t *entry); |
68 | 68 | ||
69 | typedef void (*entry_point_t)(void); |
- | |
70 | - | ||
71 | int elf_load_file(char *file_name, elf_header_t *header) |
69 | int elf_load_file(char *file_name, elf_info_t *info) |
72 | { |
70 | { |
- | 71 | elf_ld_t elf; |
|
- | 72 | ||
73 | int fd; |
73 | int fd; |
74 | int rc; |
74 | int rc; |
75 | 75 | ||
76 | printf("open and read '%s'...\n", file_name); |
76 | printf("open and read '%s'...\n", file_name); |
77 | 77 | ||
Line 79... | Line 79... | ||
79 | if (fd < 0) { |
79 | if (fd < 0) { |
80 | printf("failed opening file\n"); |
80 | printf("failed opening file\n"); |
81 | return -1; |
81 | return -1; |
82 | } |
82 | } |
83 | 83 | ||
- | 84 | elf.fd = fd; |
|
- | 85 | elf.info = info; |
|
- | 86 | ||
84 | rc = elf_load(fd, header); |
87 | rc = elf_load(&elf); |
85 | printf("elf_load() -> %d\n", rc); |
88 | printf("elf_load() -> %d\n", rc); |
86 | 89 | ||
87 | close(fd); |
90 | close(fd); |
88 | 91 | ||
89 | return rc; |
92 | return rc; |
90 | } |
93 | } |
91 | 94 | ||
92 | void elf_run(elf_header_t *header) |
95 | void elf_run(elf_info_t *info) |
93 | { |
96 | { |
94 | entry_point_t entry_point; |
- | |
95 | - | ||
96 | entry_point = (entry_point_t)header->e_entry; |
- | |
97 | (*entry_point)(); |
97 | (*info->entry)(); |
98 | 98 | ||
99 | /* not reached */ |
99 | /* not reached */ |
100 | } |
100 | } |
101 | 101 | ||
102 | int elf_create_pcb(elf_header_t *header) |
102 | int elf_create_pcb(elf_info_t *info) |
103 | { |
103 | { |
104 | pcb_t *pcb; |
104 | pcb_t *pcb; |
105 | void *a; |
105 | void *a; |
106 | 106 | ||
107 | pcb = (pcb_t *)PCB_ADDRESS; |
107 | pcb = (pcb_t *)PCB_ADDRESS; |
Line 110... | Line 110... | ||
110 | if (a == (void *)(-1)) { |
110 | if (a == (void *)(-1)) { |
111 | printf("elf_create_pcb: memory mapping failed\n"); |
111 | printf("elf_create_pcb: memory mapping failed\n"); |
112 | return EE_MEMORY; |
112 | return EE_MEMORY; |
113 | } |
113 | } |
114 | 114 | ||
115 | pcb->entry = (entry_point_t)header->e_entry; |
115 | pcb->entry = info->entry; |
116 | 116 | ||
117 | return 0; |
117 | return 0; |
118 | } |
118 | } |
119 | 119 | ||
120 | 120 | ||
121 | /** ELF loader |
121 | /** ELF loader |
122 | * |
122 | * |
123 | * @param header Pointer to ELF header in memory |
123 | * @param header Pointer to ELF header in memory |
124 | * @return EE_OK on success |
124 | * @return EE_OK on success |
125 | */ |
125 | */ |
126 | static unsigned int elf_load(int fd, elf_header_t *header) |
126 | static unsigned int elf_load(elf_ld_t *elf) |
127 | { |
127 | { |
- | 128 | elf_header_t header_buf; |
|
- | 129 | elf_header_t *header = &header_buf; |
|
128 | int i, rc; |
130 | int i, rc; |
129 | 131 | ||
130 | rc = read(fd, header, sizeof(elf_header_t)); |
132 | rc = read(elf->fd, header, sizeof(elf_header_t)); |
131 | if (rc < 0) { |
133 | if (rc < 0) { |
132 | printf("read error\n"); |
134 | printf("read error\n"); |
133 | return EE_INVALID; |
135 | return EE_INVALID; |
134 | } |
136 | } |
135 | 137 | ||
- | 138 | elf->header = header; |
|
- | 139 | ||
136 | printf("ELF-load:"); |
140 | printf("ELF-load:"); |
137 | /* Identify ELF */ |
141 | /* Identify ELF */ |
138 | if (header->e_ident[EI_MAG0] != ELFMAG0 || |
142 | if (header->e_ident[EI_MAG0] != ELFMAG0 || |
139 | header->e_ident[EI_MAG1] != ELFMAG1 || |
143 | header->e_ident[EI_MAG1] != ELFMAG1 || |
140 | header->e_ident[EI_MAG2] != ELFMAG2 || |
144 | header->e_ident[EI_MAG2] != ELFMAG2 || |
Line 162... | Line 166... | ||
162 | /* Check if the object type is supported. */ |
166 | /* Check if the object type is supported. */ |
163 | if (header->e_type != ET_EXEC && header->e_type != ET_DYN) { |
167 | if (header->e_type != ET_EXEC && header->e_type != ET_DYN) { |
164 | printf("Object type %d is not supported\n", header->e_type); |
168 | printf("Object type %d is not supported\n", header->e_type); |
165 | return EE_UNSUPPORTED; |
169 | return EE_UNSUPPORTED; |
166 | } |
170 | } |
- | 171 | ||
- | 172 | /* The run-time dynamic linker is loaded with a bias */ |
|
167 | if (header->e_type == ET_DYN) header->e_entry += RTLD_BIAS; |
173 | if (header->e_type == ET_DYN) |
- | 174 | elf->bias = RTLD_BIAS; |
|
- | 175 | else |
|
- | 176 | elf->bias = 0; |
|
168 | 177 | ||
169 | printf("parse segments\n"); |
178 | printf("parse segments\n"); |
170 | 179 | ||
171 | /* Walk through all segment headers and process them. */ |
180 | /* Walk through all segment headers and process them. */ |
172 | for (i = 0; i < header->e_phnum; i++) { |
181 | for (i = 0; i < header->e_phnum; i++) { |
- | 182 | elf_segment_header_t segment_hdr; |
|
173 | 183 | ||
174 | /* Seek to start of segment header */ |
184 | /* Seek to start of segment header */ |
- | 185 | lseek(elf->fd, header->e_phoff |
|
- | 186 | + i * sizeof(elf_segment_header_t), SEEK_SET); |
|
- | 187 | ||
175 | lseek(fd, header->e_phoff + i * sizeof(elf_segment_header_t), |
188 | rc = read(elf->fd, &segment_hdr, sizeof(elf_segment_header_t)); |
176 | SEEK_SET); |
189 | if (rc < 0) { printf("read error\n"); return EE_INVALID; } |
177 | 190 | ||
178 | rc = segment_header(fd, header); |
191 | rc = segment_header(elf, &segment_hdr); |
179 | if (rc != EE_OK) |
192 | if (rc != EE_OK) |
180 | return rc; |
193 | return rc; |
181 | } |
194 | } |
182 | 195 | ||
183 | printf("parse sections\n"); |
196 | printf("parse sections\n"); |
184 | 197 | ||
185 | /* Inspect all section headers and proccess them. */ |
198 | /* Inspect all section headers and proccess them. */ |
186 | for (i = 0; i < header->e_shnum; i++) { |
199 | for (i = 0; i < header->e_shnum; i++) { |
- | 200 | elf_section_header_t section_hdr; |
|
187 | 201 | ||
188 | /* Seek to start of section header */ |
202 | /* Seek to start of section header */ |
189 | lseek(fd, header->e_shoff + i * sizeof(elf_section_header_t), |
203 | lseek(elf->fd, header->e_shoff |
190 | SEEK_SET); |
204 | + i * sizeof(elf_section_header_t), SEEK_SET); |
191 | 205 | ||
- | 206 | rc = read(elf->fd, §ion_hdr, sizeof(elf_section_header_t)); |
|
- | 207 | if (rc < 0) { printf("read error\n"); return EE_INVALID; } |
|
- | 208 | ||
192 | rc = section_header(fd, header); |
209 | rc = section_header(elf, §ion_hdr); |
193 | if (rc != EE_OK) |
210 | if (rc != EE_OK) |
194 | return rc; |
211 | return rc; |
195 | } |
212 | } |
196 | 213 | ||
- | 214 | elf->info->entry = |
|
- | 215 | (entry_point_t)((uint8_t *)header->e_entry + elf->bias); |
|
- | 216 | ||
197 | printf("done\n"); |
217 | printf("done\n"); |
198 | 218 | ||
199 | return EE_OK; |
219 | return EE_OK; |
200 | } |
220 | } |
201 | 221 | ||
Line 217... | Line 237... | ||
217 | * @param entry Segment header. |
237 | * @param entry Segment header. |
218 | * @param elf ELF header. |
238 | * @param elf ELF header. |
219 | * |
239 | * |
220 | * @return EE_OK on success, error code otherwise. |
240 | * @return EE_OK on success, error code otherwise. |
221 | */ |
241 | */ |
222 | static int segment_header(int fd, elf_header_t *elf) |
242 | static int segment_header(elf_ld_t *elf, elf_segment_header_t *entry) |
223 | { |
243 | { |
224 | static elf_segment_header_t entry_buf; |
- | |
225 | elf_segment_header_t *entry = &entry_buf; |
- | |
226 | int rc; |
- | |
227 | - | ||
228 | rc = read(fd, entry, sizeof(elf_segment_header_t)); |
- | |
229 | if (rc < 0) { printf("read error\n"); return EE_INVALID; } |
- | |
230 | - | ||
231 | switch (entry->p_type) { |
244 | switch (entry->p_type) { |
232 | case PT_NULL: |
245 | case PT_NULL: |
233 | case PT_PHDR: |
246 | case PT_PHDR: |
234 | break; |
247 | break; |
235 | case PT_LOAD: |
248 | case PT_LOAD: |
236 | return load_segment(fd, entry, elf); |
249 | return load_segment(elf, entry); |
237 | break; |
250 | break; |
238 | case PT_DYNAMIC: |
251 | case PT_DYNAMIC: |
239 | case PT_INTERP: |
252 | case PT_INTERP: |
240 | case PT_SHLIB: |
253 | case PT_SHLIB: |
241 | case PT_NOTE: |
254 | case PT_NOTE: |
Line 254... | Line 267... | ||
254 | * @param entry Program header entry describing segment to be loaded. |
267 | * @param entry Program header entry describing segment to be loaded. |
255 | * @param elf ELF header. |
268 | * @param elf ELF header. |
256 | * |
269 | * |
257 | * @return EE_OK on success, error code otherwise. |
270 | * @return EE_OK on success, error code otherwise. |
258 | */ |
271 | */ |
259 | int load_segment(int fd, elf_segment_header_t *entry, elf_header_t *elf) |
272 | int load_segment(elf_ld_t *elf, elf_segment_header_t *entry) |
260 | { |
273 | { |
261 | void *a; |
274 | void *a; |
262 | int flags = 0; |
275 | int flags = 0; |
263 | uintptr_t bias; |
276 | uintptr_t bias; |
264 | int rc; |
277 | int rc; |
265 | 278 | ||
266 | printf("load segment at addr 0x%x, size 0x%x\n", entry->p_vaddr, |
279 | printf("load segment at addr 0x%x, size 0x%x\n", entry->p_vaddr, |
267 | entry->p_memsz); |
280 | entry->p_memsz); |
268 | 281 | ||
269 | bias = (elf->e_type == ET_DYN) ? RTLD_BIAS : 0; |
282 | bias = elf->bias; |
270 | 283 | ||
271 | if (entry->p_align > 1) { |
284 | if (entry->p_align > 1) { |
272 | if ((entry->p_offset % entry->p_align) != |
285 | if ((entry->p_offset % entry->p_align) != |
273 | (entry->p_vaddr % entry->p_align)) { |
286 | (entry->p_vaddr % entry->p_align)) { |
274 | printf("align check 1 failed offset%%align=%d, vaddr%%align=%d\n", |
287 | printf("align check 1 failed offset%%align=%d, vaddr%%align=%d\n", |
Line 316... | Line 329... | ||
316 | 329 | ||
317 | /* |
330 | /* |
318 | * Load segment data |
331 | * Load segment data |
319 | */ |
332 | */ |
320 | printf("seek to %d\n", entry->p_offset); |
333 | printf("seek to %d\n", entry->p_offset); |
321 | rc = lseek(fd, entry->p_offset, SEEK_SET); |
334 | rc = lseek(elf->fd, entry->p_offset, SEEK_SET); |
322 | if (rc < 0) { printf("seek error\n"); return EE_INVALID; } |
335 | if (rc < 0) { printf("seek error\n"); return EE_INVALID; } |
323 | 336 | ||
324 | printf("read 0x%x bytes to address 0x%x\n", entry->p_filesz, entry->p_vaddr+bias); |
337 | printf("read 0x%x bytes to address 0x%x\n", entry->p_filesz, entry->p_vaddr+bias); |
325 | /* rc = read(fd, (void *)(entry->p_vaddr + bias), entry->p_filesz); |
338 | /* rc = read(fd, (void *)(entry->p_vaddr + bias), entry->p_filesz); |
326 | if (rc < 0) { printf("read error\n"); return EE_INVALID; }*/ |
339 | if (rc < 0) { printf("read error\n"); return EE_INVALID; }*/ |
Line 332... | Line 345... | ||
332 | 345 | ||
333 | while (left > 0) { |
346 | while (left > 0) { |
334 | now = 4096; |
347 | now = 4096; |
335 | if (now > left) now=left; |
348 | if (now > left) now=left; |
336 | printf("read %d...", now); |
349 | printf("read %d...", now); |
337 | rc = read(fd, dp, now); |
350 | rc = read(elf->fd, dp, now); |
338 | if (rc < 0) { printf("read error\n"); return EE_INVALID; } |
351 | if (rc < 0) { printf("read error\n"); return EE_INVALID; } |
339 | printf("->%d\n", rc); |
352 | printf("->%d\n", rc); |
340 | left -= now; |
353 | left -= now; |
341 | dp += now; |
354 | dp += now; |
342 | } |
355 | } |
Line 349... | Line 362... | ||
349 | * @param entry Segment header. |
362 | * @param entry Segment header. |
350 | * @param elf ELF header. |
363 | * @param elf ELF header. |
351 | * |
364 | * |
352 | * @return EE_OK on success, error code otherwise. |
365 | * @return EE_OK on success, error code otherwise. |
353 | */ |
366 | */ |
354 | static int section_header(int fd, elf_header_t *elf) |
367 | static int section_header(elf_ld_t *elf, elf_section_header_t *entry) |
355 | { |
368 | { |
356 | static elf_section_header_t entry_buf; |
- | |
357 | elf_section_header_t *entry = &entry_buf; |
- | |
358 | int rc; |
- | |
359 | - | ||
360 | rc = read(fd, entry, sizeof(elf_section_header_t)); |
- | |
361 | if (rc < 0) { printf("read error\n"); return EE_INVALID; } |
- | |
362 | - | ||
363 | switch (entry->sh_type) { |
369 | switch (entry->sh_type) { |
364 | case SHT_PROGBITS: |
370 | case SHT_PROGBITS: |
365 | if (entry->sh_flags & SHF_TLS) { |
371 | if (entry->sh_flags & SHF_TLS) { |
366 | /* .tdata */ |
372 | /* .tdata */ |
367 | } |
373 | } |
Line 370... | Line 376... | ||
370 | if (entry->sh_flags & SHF_TLS) { |
376 | if (entry->sh_flags & SHF_TLS) { |
371 | /* .tbss */ |
377 | /* .tbss */ |
372 | } |
378 | } |
373 | break; |
379 | break; |
374 | case SHT_DYNAMIC: |
380 | case SHT_DYNAMIC: |
- | 381 | elf->info->dynamic = |
|
- | 382 | (void *)((uint8_t *)entry->sh_addr + elf->bias); |
|
375 | printf("dynamic section found\n"); |
383 | printf("dynamic section found at 0x%x\n", |
- | 384 | (uintptr_t)elf->info->dynamic); |
|
376 | break; |
385 | break; |
377 | default: |
386 | default: |
378 | break; |
387 | break; |
379 | } |
388 | } |
380 | 389 |