]>
Commit | Line | Data |
---|---|---|
310df056 WL |
1 | /* |
2 | * ELF loading code | |
3 | * | |
4 | * Copyright (c) 2013 Stacey D. Son | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, see <http://www.gnu.org/licenses/>. | |
18 | */ | |
84778508 | 19 | |
2231197c | 20 | #include "qemu/osdep.h" |
84778508 BS |
21 | |
22 | #include "qemu.h" | |
76cad711 | 23 | #include "disas/disas.h" |
f348b6d1 | 24 | #include "qemu/path.h" |
84778508 | 25 | |
98b34d35 WL |
26 | static abi_ulong target_auxents; /* Where the AUX entries are in target */ |
27 | static size_t target_auxents_sz; /* Size of AUX entries including AT_NULL */ | |
84778508 | 28 | |
0475f8fa | 29 | #include "target_arch_reg.h" |
98b34d35 WL |
30 | #include "target_os_elf.h" |
31 | #include "target_os_stack.h" | |
32 | #include "target_os_thread.h" | |
0475f8fa | 33 | #include "target_os_user.h" |
84778508 | 34 | |
98b34d35 WL |
35 | abi_ulong target_stksiz; |
36 | abi_ulong target_stkbas; | |
84778508 | 37 | |
0475f8fa WL |
38 | static int elf_core_dump(int signr, CPUArchState *env); |
39 | ||
b4bebeee | 40 | static inline void memcpy_fromfs(void *to, const void *from, unsigned long n) |
84778508 | 41 | { |
b62f790c | 42 | memcpy(to, from, n); |
84778508 BS |
43 | } |
44 | ||
84778508 BS |
45 | #ifdef BSWAP_NEEDED |
46 | static void bswap_ehdr(struct elfhdr *ehdr) | |
47 | { | |
b62f790c | 48 | bswap16s(&ehdr->e_type); /* Object file type */ |
84778508 BS |
49 | bswap16s(&ehdr->e_machine); /* Architecture */ |
50 | bswap32s(&ehdr->e_version); /* Object file version */ | |
51 | bswaptls(&ehdr->e_entry); /* Entry point virtual address */ | |
52 | bswaptls(&ehdr->e_phoff); /* Program header table file offset */ | |
53 | bswaptls(&ehdr->e_shoff); /* Section header table file offset */ | |
54 | bswap32s(&ehdr->e_flags); /* Processor-specific flags */ | |
55 | bswap16s(&ehdr->e_ehsize); /* ELF header size in bytes */ | |
b62f790c | 56 | bswap16s(&ehdr->e_phentsize); /* Program header table entry size */ |
84778508 | 57 | bswap16s(&ehdr->e_phnum); /* Program header table entry count */ |
b62f790c | 58 | bswap16s(&ehdr->e_shentsize); /* Section header table entry size */ |
84778508 | 59 | bswap16s(&ehdr->e_shnum); /* Section header table entry count */ |
b62f790c | 60 | bswap16s(&ehdr->e_shstrndx); /* Section header string table index */ |
84778508 BS |
61 | } |
62 | ||
b62f790c | 63 | static void bswap_phdr(struct elf_phdr *phdr, int phnum) |
84778508 | 64 | { |
b62f790c WL |
65 | int i; |
66 | ||
67 | for (i = 0; i < phnum; i++, phdr++) { | |
68 | bswap32s(&phdr->p_type); /* Segment type */ | |
69 | bswap32s(&phdr->p_flags); /* Segment flags */ | |
70 | bswaptls(&phdr->p_offset); /* Segment file offset */ | |
71 | bswaptls(&phdr->p_vaddr); /* Segment virtual address */ | |
72 | bswaptls(&phdr->p_paddr); /* Segment physical address */ | |
73 | bswaptls(&phdr->p_filesz); /* Segment size in file */ | |
74 | bswaptls(&phdr->p_memsz); /* Segment size in memory */ | |
75 | bswaptls(&phdr->p_align); /* Segment alignment */ | |
76 | } | |
84778508 BS |
77 | } |
78 | ||
b62f790c | 79 | static void bswap_shdr(struct elf_shdr *shdr, int shnum) |
84778508 | 80 | { |
b62f790c WL |
81 | int i; |
82 | ||
83 | for (i = 0; i < shnum; i++, shdr++) { | |
84 | bswap32s(&shdr->sh_name); | |
85 | bswap32s(&shdr->sh_type); | |
86 | bswaptls(&shdr->sh_flags); | |
87 | bswaptls(&shdr->sh_addr); | |
88 | bswaptls(&shdr->sh_offset); | |
89 | bswaptls(&shdr->sh_size); | |
90 | bswap32s(&shdr->sh_link); | |
91 | bswap32s(&shdr->sh_info); | |
92 | bswaptls(&shdr->sh_addralign); | |
93 | bswaptls(&shdr->sh_entsize); | |
94 | } | |
84778508 BS |
95 | } |
96 | ||
97 | static void bswap_sym(struct elf_sym *sym) | |
98 | { | |
99 | bswap32s(&sym->st_name); | |
100 | bswaptls(&sym->st_value); | |
101 | bswaptls(&sym->st_size); | |
102 | bswap16s(&sym->st_shndx); | |
103 | } | |
b62f790c | 104 | |
0475f8fa WL |
105 | static void bswap_note(struct elf_note *en) |
106 | { | |
107 | bswap32s(&en->n_namesz); | |
108 | bswap32s(&en->n_descsz); | |
109 | bswap32s(&en->n_type); | |
110 | } | |
111 | ||
b62f790c WL |
112 | #else /* ! BSWAP_NEEDED */ |
113 | ||
114 | static void bswap_ehdr(struct elfhdr *ehdr) { } | |
115 | static void bswap_phdr(struct elf_phdr *phdr, int phnum) { } | |
116 | static void bswap_shdr(struct elf_shdr *shdr, int shnum) { } | |
117 | static void bswap_sym(struct elf_sym *sym) { } | |
0475f8fa | 118 | static void bswap_note(struct elf_note *en) { } |
b62f790c WL |
119 | |
120 | #endif /* ! BSWAP_NEEDED */ | |
84778508 | 121 | |
0475f8fa WL |
122 | #include "elfcore.c" |
123 | ||
84778508 BS |
124 | /* |
125 | * 'copy_elf_strings()' copies argument/envelope strings from user | |
126 | * memory to free pages in kernel mem. These are in a format ready | |
127 | * to be put directly into the top of new user memory. | |
128 | * | |
129 | */ | |
b4bebeee | 130 | static abi_ulong copy_elf_strings(int argc, char **argv, void **page, |
84778508 BS |
131 | abi_ulong p) |
132 | { | |
133 | char *tmp, *tmp1, *pag = NULL; | |
134 | int len, offset = 0; | |
135 | ||
136 | if (!p) { | |
137 | return 0; /* bullet-proofing */ | |
138 | } | |
139 | while (argc-- > 0) { | |
140 | tmp = argv[argc]; | |
141 | if (!tmp) { | |
9bb93180 | 142 | fprintf(stderr, "VFS: argc is wrong"); |
84778508 BS |
143 | exit(-1); |
144 | } | |
145 | tmp1 = tmp; | |
146 | while (*tmp++); | |
147 | len = tmp - tmp1; | |
148 | if (p < len) { /* this shouldn't happen - 128kB */ | |
149 | return 0; | |
150 | } | |
151 | while (len) { | |
152 | --p; --tmp; --len; | |
153 | if (--offset < 0) { | |
154 | offset = p % TARGET_PAGE_SIZE; | |
b4bebeee | 155 | pag = (char *)page[p / TARGET_PAGE_SIZE]; |
84778508 | 156 | if (!pag) { |
c580dee4 | 157 | pag = g_try_malloc0(TARGET_PAGE_SIZE); |
b4bebeee | 158 | page[p / TARGET_PAGE_SIZE] = pag; |
84778508 BS |
159 | if (!pag) |
160 | return 0; | |
161 | } | |
162 | } | |
163 | if (len == 0 || offset == 0) { | |
164 | *(pag + offset) = *tmp; | |
165 | } | |
166 | else { | |
167 | int bytes_to_copy = (len > offset) ? offset : len; | |
168 | tmp -= bytes_to_copy; | |
169 | p -= bytes_to_copy; | |
170 | offset -= bytes_to_copy; | |
171 | len -= bytes_to_copy; | |
172 | memcpy_fromfs(pag + offset, tmp, bytes_to_copy + 1); | |
173 | } | |
174 | } | |
175 | } | |
176 | return p; | |
177 | } | |
178 | ||
98b34d35 WL |
179 | static void setup_arg_pages(struct bsd_binprm *bprm, struct image_info *info, |
180 | abi_ulong *stackp, abi_ulong *stringp) | |
84778508 | 181 | { |
98b34d35 WL |
182 | abi_ulong stack_base, size; |
183 | abi_long addr; | |
84778508 BS |
184 | |
185 | /* Create enough stack to hold everything. If we don't use | |
186 | * it for args, we'll use it for something else... | |
187 | */ | |
312a0b1c | 188 | size = target_dflssiz; |
98b34d35 WL |
189 | stack_base = TARGET_USRSTACK - size; |
190 | addr = target_mmap(stack_base, | |
84778508 BS |
191 | size + qemu_host_page_size, |
192 | PROT_READ | PROT_WRITE, | |
193 | MAP_PRIVATE | MAP_ANON, | |
194 | -1, 0); | |
98b34d35 | 195 | if (addr == -1) { |
84778508 BS |
196 | perror("stk mmap"); |
197 | exit(-1); | |
198 | } | |
199 | /* we reserve one extra page at the top of the stack as guard */ | |
98b34d35 | 200 | target_mprotect(addr + size, qemu_host_page_size, PROT_NONE); |
84778508 | 201 | |
98b34d35 WL |
202 | target_stksiz = size; |
203 | target_stkbas = addr; | |
84778508 | 204 | |
98b34d35 WL |
205 | if (setup_initial_stack(bprm, stackp, stringp) != 0) { |
206 | perror("stk setup"); | |
207 | exit(-1); | |
84778508 | 208 | } |
84778508 BS |
209 | } |
210 | ||
211 | static void set_brk(abi_ulong start, abi_ulong end) | |
212 | { | |
213 | /* page-align the start and end addresses... */ | |
214 | start = HOST_PAGE_ALIGN(start); | |
215 | end = HOST_PAGE_ALIGN(end); | |
216 | if (end <= start) | |
217 | return; | |
b4bebeee | 218 | if (target_mmap(start, end - start, |
84778508 BS |
219 | PROT_READ | PROT_WRITE | PROT_EXEC, |
220 | MAP_FIXED | MAP_PRIVATE | MAP_ANON, -1, 0) == -1) { | |
221 | perror("cannot mmap brk"); | |
222 | exit(-1); | |
223 | } | |
224 | } | |
225 | ||
226 | ||
227 | /* We need to explicitly zero any fractional pages after the data | |
228 | section (i.e. bss). This would contain the junk from the file that | |
229 | should not be in memory. */ | |
230 | static void padzero(abi_ulong elf_bss, abi_ulong last_bss) | |
231 | { | |
232 | abi_ulong nbyte; | |
233 | ||
234 | if (elf_bss >= last_bss) | |
235 | return; | |
236 | ||
237 | /* XXX: this is really a hack : if the real host page size is | |
238 | smaller than the target page size, some pages after the end | |
239 | of the file may not be mapped. A better fix would be to | |
240 | patch target_mmap(), but it is more complicated as the file | |
241 | size must be known */ | |
242 | if (qemu_real_host_page_size < qemu_host_page_size) { | |
243 | abi_ulong end_addr, end_addr1; | |
0c2d70c4 | 244 | end_addr1 = REAL_HOST_PAGE_ALIGN(elf_bss); |
84778508 BS |
245 | end_addr = HOST_PAGE_ALIGN(elf_bss); |
246 | if (end_addr1 < end_addr) { | |
3e8f1628 | 247 | mmap((void *)g2h_untagged(end_addr1), end_addr - end_addr1, |
b4bebeee WL |
248 | PROT_READ | PROT_WRITE | PROT_EXEC, |
249 | MAP_FIXED | MAP_PRIVATE | MAP_ANON, -1, 0); | |
84778508 BS |
250 | } |
251 | } | |
252 | ||
b4bebeee | 253 | nbyte = elf_bss & (qemu_host_page_size - 1); |
84778508 BS |
254 | if (nbyte) { |
255 | nbyte = qemu_host_page_size - nbyte; | |
256 | do { | |
257 | /* FIXME - what to do if put_user() fails? */ | |
258 | put_user_u8(0, elf_bss); | |
259 | elf_bss++; | |
260 | } while (--nbyte); | |
261 | } | |
262 | } | |
263 | ||
b4bebeee | 264 | static abi_ulong load_elf_interp(struct elfhdr *interp_elf_ex, |
84778508 BS |
265 | int interpreter_fd, |
266 | abi_ulong *interp_load_addr) | |
267 | { | |
b4bebeee WL |
268 | struct elf_phdr *elf_phdata = NULL; |
269 | struct elf_phdr *eppnt; | |
270 | abi_ulong load_addr = 0; | |
271 | int load_addr_set = 0; | |
272 | int retval; | |
273 | abi_ulong last_bss, elf_bss; | |
274 | abi_ulong error; | |
275 | int i; | |
84778508 | 276 | |
b4bebeee WL |
277 | elf_bss = 0; |
278 | last_bss = 0; | |
279 | error = 0; | |
84778508 | 280 | |
b4bebeee | 281 | bswap_ehdr(interp_elf_ex); |
b4bebeee WL |
282 | /* First of all, some simple consistency checks */ |
283 | if ((interp_elf_ex->e_type != ET_EXEC && | |
284 | interp_elf_ex->e_type != ET_DYN) || | |
285 | !elf_check_arch(interp_elf_ex->e_machine)) { | |
286 | return ~((abi_ulong)0UL); | |
287 | } | |
84778508 BS |
288 | |
289 | ||
b4bebeee | 290 | /* Now read in all of the header information */ |
84778508 | 291 | |
b4bebeee WL |
292 | if (sizeof(struct elf_phdr) * interp_elf_ex->e_phnum > TARGET_PAGE_SIZE) |
293 | return ~(abi_ulong)0UL; | |
84778508 | 294 | |
b4bebeee WL |
295 | elf_phdata = (struct elf_phdr *) |
296 | malloc(sizeof(struct elf_phdr) * interp_elf_ex->e_phnum); | |
84778508 | 297 | |
b4bebeee WL |
298 | if (!elf_phdata) |
299 | return ~((abi_ulong)0UL); | |
84778508 | 300 | |
b4bebeee WL |
301 | /* |
302 | * If the size of this structure has changed, then punt, since | |
303 | * we will be doing the wrong thing. | |
304 | */ | |
305 | if (interp_elf_ex->e_phentsize != sizeof(struct elf_phdr)) { | |
306 | free(elf_phdata); | |
307 | return ~((abi_ulong)0UL); | |
308 | } | |
84778508 | 309 | |
b4bebeee WL |
310 | retval = lseek(interpreter_fd, interp_elf_ex->e_phoff, SEEK_SET); |
311 | if (retval >= 0) { | |
312 | retval = read(interpreter_fd, | |
313 | (char *) elf_phdata, | |
314 | sizeof(struct elf_phdr) * interp_elf_ex->e_phnum); | |
315 | } | |
316 | if (retval < 0) { | |
317 | perror("load_elf_interp"); | |
318 | exit(-1); | |
ffa03665 | 319 | free(elf_phdata); |
b4bebeee WL |
320 | return retval; |
321 | } | |
b62f790c | 322 | bswap_phdr(elf_phdata, interp_elf_ex->e_phnum); |
84778508 | 323 | |
b4bebeee WL |
324 | if (interp_elf_ex->e_type == ET_DYN) { |
325 | /* in order to avoid hardcoding the interpreter load | |
326 | address in qemu, we allocate a big enough memory zone */ | |
327 | error = target_mmap(0, INTERP_MAP_SIZE, | |
328 | PROT_NONE, MAP_PRIVATE | MAP_ANON, | |
329 | -1, 0); | |
330 | if (error == -1) { | |
331 | perror("mmap"); | |
332 | exit(-1); | |
84778508 | 333 | } |
b4bebeee WL |
334 | load_addr = error; |
335 | load_addr_set = 1; | |
336 | } | |
84778508 | 337 | |
b4bebeee WL |
338 | eppnt = elf_phdata; |
339 | for (i = 0; i < interp_elf_ex->e_phnum; i++, eppnt++) | |
340 | if (eppnt->p_type == PT_LOAD) { | |
84778508 BS |
341 | int elf_type = MAP_PRIVATE | MAP_DENYWRITE; |
342 | int elf_prot = 0; | |
343 | abi_ulong vaddr = 0; | |
344 | abi_ulong k; | |
345 | ||
346 | if (eppnt->p_flags & PF_R) elf_prot = PROT_READ; | |
347 | if (eppnt->p_flags & PF_W) elf_prot |= PROT_WRITE; | |
348 | if (eppnt->p_flags & PF_X) elf_prot |= PROT_EXEC; | |
349 | if (interp_elf_ex->e_type == ET_EXEC || load_addr_set) { | |
350 | elf_type |= MAP_FIXED; | |
351 | vaddr = eppnt->p_vaddr; | |
352 | } | |
b4bebeee WL |
353 | error = target_mmap(load_addr + TARGET_ELF_PAGESTART(vaddr), |
354 | eppnt->p_filesz + TARGET_ELF_PAGEOFFSET(eppnt->p_vaddr), | |
355 | elf_prot, | |
356 | elf_type, | |
357 | interpreter_fd, | |
358 | eppnt->p_offset - TARGET_ELF_PAGEOFFSET(eppnt->p_vaddr)); | |
84778508 BS |
359 | |
360 | if (error == -1) { | |
b4bebeee WL |
361 | /* Real error */ |
362 | close(interpreter_fd); | |
363 | free(elf_phdata); | |
364 | return ~((abi_ulong)0UL); | |
84778508 BS |
365 | } |
366 | ||
367 | if (!load_addr_set && interp_elf_ex->e_type == ET_DYN) { | |
b4bebeee WL |
368 | load_addr = error; |
369 | load_addr_set = 1; | |
84778508 BS |
370 | } |
371 | ||
372 | /* | |
373 | * Find the end of the file mapping for this phdr, and keep | |
374 | * track of the largest address we see for this. | |
375 | */ | |
376 | k = load_addr + eppnt->p_vaddr + eppnt->p_filesz; | |
377 | if (k > elf_bss) elf_bss = k; | |
378 | ||
379 | /* | |
380 | * Do the same thing for the memory mapping - between | |
381 | * elf_bss and last_bss is the bss section. | |
382 | */ | |
383 | k = load_addr + eppnt->p_memsz + eppnt->p_vaddr; | |
384 | if (k > last_bss) last_bss = k; | |
b4bebeee | 385 | } |
84778508 | 386 | |
b4bebeee | 387 | /* Now use mmap to map the library into memory. */ |
84778508 | 388 | |
b4bebeee | 389 | close(interpreter_fd); |
84778508 | 390 | |
b4bebeee WL |
391 | /* |
392 | * Now fill out the bss section. First pad the last page up | |
393 | * to the page boundary, and then perform a mmap to make sure | |
394 | * that there are zeromapped pages up to and including the last | |
395 | * bss page. | |
396 | */ | |
397 | padzero(elf_bss, last_bss); | |
398 | elf_bss = TARGET_ELF_PAGESTART(elf_bss + qemu_host_page_size - 1); /* What we have mapped so far */ | |
399 | ||
400 | /* Map the last of the bss segment */ | |
401 | if (last_bss > elf_bss) { | |
402 | target_mmap(elf_bss, last_bss - elf_bss, | |
403 | PROT_READ | PROT_WRITE | PROT_EXEC, | |
404 | MAP_FIXED | MAP_PRIVATE | MAP_ANON, -1, 0); | |
405 | } | |
406 | free(elf_phdata); | |
84778508 | 407 | |
b4bebeee WL |
408 | *interp_load_addr = load_addr; |
409 | return ((abi_ulong) interp_elf_ex->e_entry) + load_addr; | |
84778508 BS |
410 | } |
411 | ||
412 | static int symfind(const void *s0, const void *s1) | |
413 | { | |
c7c530cd | 414 | target_ulong addr = *(target_ulong *)s0; |
84778508 BS |
415 | struct elf_sym *sym = (struct elf_sym *)s1; |
416 | int result = 0; | |
c7c530cd | 417 | if (addr < sym->st_value) { |
84778508 | 418 | result = -1; |
c7c530cd | 419 | } else if (addr >= sym->st_value + sym->st_size) { |
84778508 BS |
420 | result = 1; |
421 | } | |
422 | return result; | |
423 | } | |
424 | ||
425 | static const char *lookup_symbolxx(struct syminfo *s, target_ulong orig_addr) | |
426 | { | |
427 | #if ELF_CLASS == ELFCLASS32 | |
428 | struct elf_sym *syms = s->disas_symtab.elf32; | |
429 | #else | |
430 | struct elf_sym *syms = s->disas_symtab.elf64; | |
431 | #endif | |
432 | ||
433 | // binary search | |
84778508 BS |
434 | struct elf_sym *sym; |
435 | ||
c7c530cd | 436 | sym = bsearch(&orig_addr, syms, s->disas_num_syms, sizeof(*syms), symfind); |
7cba04f6 | 437 | if (sym != NULL) { |
84778508 BS |
438 | return s->disas_strtab + sym->st_name; |
439 | } | |
440 | ||
441 | return ""; | |
442 | } | |
443 | ||
444 | /* FIXME: This should use elf_ops.h */ | |
445 | static int symcmp(const void *s0, const void *s1) | |
446 | { | |
447 | struct elf_sym *sym0 = (struct elf_sym *)s0; | |
448 | struct elf_sym *sym1 = (struct elf_sym *)s1; | |
449 | return (sym0->st_value < sym1->st_value) | |
450 | ? -1 | |
451 | : ((sym0->st_value > sym1->st_value) ? 1 : 0); | |
452 | } | |
453 | ||
454 | /* Best attempt to load symbols from this ELF object. */ | |
455 | static void load_symbols(struct elfhdr *hdr, int fd) | |
456 | { | |
457 | unsigned int i, nsyms; | |
458 | struct elf_shdr sechdr, symtab, strtab; | |
459 | char *strings; | |
460 | struct syminfo *s; | |
29718712 | 461 | struct elf_sym *syms, *new_syms; |
84778508 BS |
462 | |
463 | lseek(fd, hdr->e_shoff, SEEK_SET); | |
464 | for (i = 0; i < hdr->e_shnum; i++) { | |
465 | if (read(fd, &sechdr, sizeof(sechdr)) != sizeof(sechdr)) | |
466 | return; | |
b62f790c | 467 | bswap_shdr(&sechdr, 1); |
84778508 BS |
468 | if (sechdr.sh_type == SHT_SYMTAB) { |
469 | symtab = sechdr; | |
470 | lseek(fd, hdr->e_shoff | |
471 | + sizeof(sechdr) * sechdr.sh_link, SEEK_SET); | |
472 | if (read(fd, &strtab, sizeof(strtab)) | |
473 | != sizeof(strtab)) | |
474 | return; | |
b62f790c | 475 | bswap_shdr(&strtab, 1); |
84778508 BS |
476 | goto found; |
477 | } | |
478 | } | |
479 | return; /* Shouldn't happen... */ | |
480 | ||
481 | found: | |
482 | /* Now know where the strtab and symtab are. Snarf them. */ | |
483 | s = malloc(sizeof(*s)); | |
484 | syms = malloc(symtab.sh_size); | |
29718712 SW |
485 | if (!syms) { |
486 | free(s); | |
84778508 | 487 | return; |
29718712 | 488 | } |
84778508 | 489 | s->disas_strtab = strings = malloc(strtab.sh_size); |
29718712 SW |
490 | if (!s->disas_strtab) { |
491 | free(s); | |
492 | free(syms); | |
84778508 | 493 | return; |
29718712 | 494 | } |
84778508 BS |
495 | |
496 | lseek(fd, symtab.sh_offset, SEEK_SET); | |
29718712 SW |
497 | if (read(fd, syms, symtab.sh_size) != symtab.sh_size) { |
498 | free(s); | |
499 | free(syms); | |
500 | free(strings); | |
84778508 | 501 | return; |
29718712 | 502 | } |
84778508 BS |
503 | |
504 | nsyms = symtab.sh_size / sizeof(struct elf_sym); | |
505 | ||
506 | i = 0; | |
507 | while (i < nsyms) { | |
84778508 | 508 | bswap_sym(syms + i); |
84778508 BS |
509 | // Throw away entries which we do not need. |
510 | if (syms[i].st_shndx == SHN_UNDEF || | |
511 | syms[i].st_shndx >= SHN_LORESERVE || | |
512 | ELF_ST_TYPE(syms[i].st_info) != STT_FUNC) { | |
513 | nsyms--; | |
514 | if (i < nsyms) { | |
515 | syms[i] = syms[nsyms]; | |
516 | } | |
517 | continue; | |
518 | } | |
84778508 BS |
519 | i++; |
520 | } | |
29718712 SW |
521 | |
522 | /* Attempt to free the storage associated with the local symbols | |
523 | that we threw away. Whether or not this has any effect on the | |
524 | memory allocation depends on the malloc implementation and how | |
525 | many symbols we managed to discard. */ | |
526 | new_syms = realloc(syms, nsyms * sizeof(*syms)); | |
527 | if (new_syms == NULL) { | |
528 | free(s); | |
529 | free(syms); | |
530 | free(strings); | |
531 | return; | |
532 | } | |
533 | syms = new_syms; | |
84778508 BS |
534 | |
535 | qsort(syms, nsyms, sizeof(*syms), symcmp); | |
536 | ||
537 | lseek(fd, strtab.sh_offset, SEEK_SET); | |
29718712 SW |
538 | if (read(fd, strings, strtab.sh_size) != strtab.sh_size) { |
539 | free(s); | |
540 | free(syms); | |
541 | free(strings); | |
84778508 | 542 | return; |
29718712 | 543 | } |
84778508 BS |
544 | s->disas_num_syms = nsyms; |
545 | #if ELF_CLASS == ELFCLASS32 | |
546 | s->disas_symtab.elf32 = syms; | |
032e51d7 | 547 | s->lookup_symbol = (lookup_symbol_t)lookup_symbolxx; |
84778508 BS |
548 | #else |
549 | s->disas_symtab.elf64 = syms; | |
032e51d7 | 550 | s->lookup_symbol = (lookup_symbol_t)lookup_symbolxx; |
84778508 BS |
551 | #endif |
552 | s->next = syminfos; | |
553 | syminfos = s; | |
554 | } | |
555 | ||
afcbcff8 | 556 | int load_elf_binary(struct bsd_binprm *bprm, struct target_pt_regs *regs, |
b4bebeee | 557 | struct image_info *info) |
84778508 BS |
558 | { |
559 | struct elfhdr elf_ex; | |
560 | struct elfhdr interp_elf_ex; | |
84778508 BS |
561 | int interpreter_fd = -1; /* avoid warning */ |
562 | abi_ulong load_addr, load_bias; | |
563 | int load_addr_set = 0; | |
84778508 | 564 | int i; |
84778508 BS |
565 | struct elf_phdr * elf_ppnt; |
566 | struct elf_phdr *elf_phdata; | |
567 | abi_ulong elf_bss, k, elf_brk; | |
568 | int retval; | |
569 | char * elf_interpreter; | |
570 | abi_ulong elf_entry, interp_load_addr = 0; | |
84778508 BS |
571 | abi_ulong start_code, end_code, start_data, end_data; |
572 | abi_ulong reloc_func_desc = 0; | |
84778508 | 573 | |
84778508 BS |
574 | load_addr = 0; |
575 | load_bias = 0; | |
576 | elf_ex = *((struct elfhdr *) bprm->buf); /* exec-header */ | |
84778508 | 577 | bswap_ehdr(&elf_ex); |
84778508 BS |
578 | |
579 | /* First of all, some simple consistency checks */ | |
580 | if ((elf_ex.e_type != ET_EXEC && elf_ex.e_type != ET_DYN) || | |
b4bebeee | 581 | (!elf_check_arch(elf_ex.e_machine))) { |
84778508 BS |
582 | return -ENOEXEC; |
583 | } | |
584 | ||
585 | bprm->p = copy_elf_strings(1, &bprm->filename, bprm->page, bprm->p); | |
b4bebeee WL |
586 | bprm->p = copy_elf_strings(bprm->envc, bprm->envp, bprm->page,bprm->p); |
587 | bprm->p = copy_elf_strings(bprm->argc, bprm->argv, bprm->page,bprm->p); | |
84778508 BS |
588 | if (!bprm->p) { |
589 | retval = -E2BIG; | |
590 | } | |
591 | ||
592 | /* Now read in all of the header information */ | |
593 | elf_phdata = (struct elf_phdr *)malloc(elf_ex.e_phentsize*elf_ex.e_phnum); | |
594 | if (elf_phdata == NULL) { | |
595 | return -ENOMEM; | |
596 | } | |
597 | ||
598 | retval = lseek(bprm->fd, elf_ex.e_phoff, SEEK_SET); | |
b4bebeee WL |
599 | if (retval > 0) { |
600 | retval = read(bprm->fd, (char *)elf_phdata, | |
84778508 BS |
601 | elf_ex.e_phentsize * elf_ex.e_phnum); |
602 | } | |
603 | ||
604 | if (retval < 0) { | |
605 | perror("load_elf_binary"); | |
606 | exit(-1); | |
b4bebeee | 607 | free(elf_phdata); |
84778508 BS |
608 | return -errno; |
609 | } | |
610 | ||
b62f790c WL |
611 | bswap_phdr(elf_phdata, elf_ex.e_phnum); |
612 | ||
84778508 BS |
613 | elf_ppnt = elf_phdata; |
614 | ||
615 | elf_bss = 0; | |
616 | elf_brk = 0; | |
617 | ||
618 | ||
84778508 BS |
619 | elf_interpreter = NULL; |
620 | start_code = ~((abi_ulong)0UL); | |
621 | end_code = 0; | |
622 | start_data = 0; | |
623 | end_data = 0; | |
84778508 | 624 | |
b4bebeee | 625 | for (i = 0;i < elf_ex.e_phnum; i++) { |
84778508 | 626 | if (elf_ppnt->p_type == PT_INTERP) { |
b4bebeee | 627 | if (elf_interpreter != NULL) |
84778508 | 628 | { |
b4bebeee | 629 | free(elf_phdata); |
84778508 BS |
630 | free(elf_interpreter); |
631 | close(bprm->fd); | |
632 | return -EINVAL; | |
633 | } | |
634 | ||
635 | /* This is the program interpreter used for | |
636 | * shared libraries - for now assume that this | |
637 | * is an a.out format binary | |
638 | */ | |
639 | ||
640 | elf_interpreter = (char *)malloc(elf_ppnt->p_filesz); | |
641 | ||
642 | if (elf_interpreter == NULL) { | |
b4bebeee | 643 | free(elf_phdata); |
84778508 BS |
644 | close(bprm->fd); |
645 | return -ENOMEM; | |
646 | } | |
647 | ||
648 | retval = lseek(bprm->fd, elf_ppnt->p_offset, SEEK_SET); | |
b4bebeee | 649 | if (retval >= 0) { |
84778508 BS |
650 | retval = read(bprm->fd, elf_interpreter, elf_ppnt->p_filesz); |
651 | } | |
b4bebeee | 652 | if (retval < 0) { |
84778508 BS |
653 | perror("load_elf_binary2"); |
654 | exit(-1); | |
655 | } | |
656 | ||
84778508 BS |
657 | if (retval >= 0) { |
658 | retval = open(path(elf_interpreter), O_RDONLY); | |
b4bebeee | 659 | if (retval >= 0) { |
84778508 BS |
660 | interpreter_fd = retval; |
661 | } | |
662 | else { | |
663 | perror(elf_interpreter); | |
664 | exit(-1); | |
665 | /* retval = -errno; */ | |
666 | } | |
667 | } | |
668 | ||
669 | if (retval >= 0) { | |
670 | retval = lseek(interpreter_fd, 0, SEEK_SET); | |
b4bebeee WL |
671 | if (retval >= 0) { |
672 | retval = read(interpreter_fd, bprm->buf, 128); | |
84778508 BS |
673 | } |
674 | } | |
675 | if (retval >= 0) { | |
6ece4df6 | 676 | interp_elf_ex = *((struct elfhdr *) bprm->buf); /* elf exec-header */ |
84778508 BS |
677 | } |
678 | if (retval < 0) { | |
679 | perror("load_elf_binary3"); | |
680 | exit(-1); | |
b4bebeee | 681 | free(elf_phdata); |
84778508 BS |
682 | free(elf_interpreter); |
683 | close(bprm->fd); | |
684 | return retval; | |
685 | } | |
686 | } | |
687 | elf_ppnt++; | |
688 | } | |
689 | ||
690 | /* Some simple consistency checks for the interpreter */ | |
b4bebeee | 691 | if (elf_interpreter) { |
84778508 | 692 | if (interp_elf_ex.e_ident[0] != 0x7f || |
ffa03665 | 693 | strncmp((char *)&interp_elf_ex.e_ident[1], "ELF", 3) != 0) { |
84778508 BS |
694 | free(elf_interpreter); |
695 | free(elf_phdata); | |
696 | close(bprm->fd); | |
697 | return -ELIBBAD; | |
698 | } | |
699 | } | |
700 | ||
701 | /* OK, we are done with that, now set up the arg stuff, | |
702 | and then start this sucker up */ | |
703 | ||
ffa03665 WL |
704 | if (!bprm->p) { |
705 | free(elf_interpreter); | |
706 | free(elf_phdata); | |
707 | close(bprm->fd); | |
708 | return -E2BIG; | |
84778508 BS |
709 | } |
710 | ||
711 | /* OK, This is the point of no return */ | |
712 | info->end_data = 0; | |
713 | info->end_code = 0; | |
714 | info->start_mmap = (abi_ulong)ELF_START_MMAP; | |
715 | info->mmap = 0; | |
716 | elf_entry = (abi_ulong) elf_ex.e_entry; | |
717 | ||
718 | /* Do this so that we can load the interpreter, if need be. We will | |
719 | change some of these later */ | |
720 | info->rss = 0; | |
98b34d35 | 721 | setup_arg_pages(bprm, info, &bprm->p, &bprm->stringp); |
84778508 BS |
722 | info->start_stack = bprm->p; |
723 | ||
724 | /* Now we do a little grungy work by mmaping the ELF image into | |
725 | * the correct location in memory. At this point, we assume that | |
726 | * the image should be loaded at fixed address, not at a variable | |
727 | * address. | |
728 | */ | |
729 | ||
b4bebeee | 730 | for (i = 0, elf_ppnt = elf_phdata; i < elf_ex.e_phnum; i++, elf_ppnt++) { |
84778508 BS |
731 | int elf_prot = 0; |
732 | int elf_flags = 0; | |
733 | abi_ulong error; | |
734 | ||
735 | if (elf_ppnt->p_type != PT_LOAD) | |
736 | continue; | |
737 | ||
738 | if (elf_ppnt->p_flags & PF_R) elf_prot |= PROT_READ; | |
739 | if (elf_ppnt->p_flags & PF_W) elf_prot |= PROT_WRITE; | |
740 | if (elf_ppnt->p_flags & PF_X) elf_prot |= PROT_EXEC; | |
741 | elf_flags = MAP_PRIVATE | MAP_DENYWRITE; | |
742 | if (elf_ex.e_type == ET_EXEC || load_addr_set) { | |
743 | elf_flags |= MAP_FIXED; | |
744 | } else if (elf_ex.e_type == ET_DYN) { | |
745 | /* Try and get dynamic programs out of the way of the default mmap | |
746 | base, as well as whatever program they might try to exec. This | |
747 | is because the brk will follow the loader, and is not movable. */ | |
748 | /* NOTE: for qemu, we do a big mmap to get enough space | |
749 | without hardcoding any address */ | |
750 | error = target_mmap(0, ET_DYN_MAP_SIZE, | |
751 | PROT_NONE, MAP_PRIVATE | MAP_ANON, | |
752 | -1, 0); | |
753 | if (error == -1) { | |
754 | perror("mmap"); | |
755 | exit(-1); | |
756 | } | |
757 | load_bias = TARGET_ELF_PAGESTART(error - elf_ppnt->p_vaddr); | |
758 | } | |
759 | ||
760 | error = target_mmap(TARGET_ELF_PAGESTART(load_bias + elf_ppnt->p_vaddr), | |
761 | (elf_ppnt->p_filesz + | |
762 | TARGET_ELF_PAGEOFFSET(elf_ppnt->p_vaddr)), | |
763 | elf_prot, | |
764 | (MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE), | |
765 | bprm->fd, | |
766 | (elf_ppnt->p_offset - | |
767 | TARGET_ELF_PAGEOFFSET(elf_ppnt->p_vaddr))); | |
768 | if (error == -1) { | |
769 | perror("mmap"); | |
770 | exit(-1); | |
771 | } | |
772 | ||
84778508 BS |
773 | if (!load_addr_set) { |
774 | load_addr_set = 1; | |
775 | load_addr = elf_ppnt->p_vaddr - elf_ppnt->p_offset; | |
776 | if (elf_ex.e_type == ET_DYN) { | |
777 | load_bias += error - | |
778 | TARGET_ELF_PAGESTART(load_bias + elf_ppnt->p_vaddr); | |
779 | load_addr += load_bias; | |
780 | reloc_func_desc = load_bias; | |
781 | } | |
782 | } | |
783 | k = elf_ppnt->p_vaddr; | |
784 | if (k < start_code) | |
785 | start_code = k; | |
786 | if (start_data < k) | |
787 | start_data = k; | |
788 | k = elf_ppnt->p_vaddr + elf_ppnt->p_filesz; | |
789 | if (k > elf_bss) | |
790 | elf_bss = k; | |
791 | if ((elf_ppnt->p_flags & PF_X) && end_code < k) | |
792 | end_code = k; | |
793 | if (end_data < k) | |
794 | end_data = k; | |
795 | k = elf_ppnt->p_vaddr + elf_ppnt->p_memsz; | |
796 | if (k > elf_brk) elf_brk = k; | |
797 | } | |
798 | ||
799 | elf_entry += load_bias; | |
800 | elf_bss += load_bias; | |
801 | elf_brk += load_bias; | |
802 | start_code += load_bias; | |
803 | end_code += load_bias; | |
804 | start_data += load_bias; | |
805 | end_data += load_bias; | |
806 | ||
807 | if (elf_interpreter) { | |
ffa03665 WL |
808 | elf_entry = load_elf_interp(&interp_elf_ex, interpreter_fd, |
809 | &interp_load_addr); | |
84778508 BS |
810 | reloc_func_desc = interp_load_addr; |
811 | ||
812 | close(interpreter_fd); | |
813 | free(elf_interpreter); | |
814 | ||
815 | if (elf_entry == ~((abi_ulong)0UL)) { | |
816 | printf("Unable to load interpreter\n"); | |
817 | free(elf_phdata); | |
818 | exit(-1); | |
819 | return 0; | |
820 | } | |
821 | } | |
822 | ||
823 | free(elf_phdata); | |
824 | ||
93fcfe39 | 825 | if (qemu_log_enabled()) |
84778508 BS |
826 | load_symbols(&elf_ex, bprm->fd); |
827 | ||
ffa03665 | 828 | close(bprm->fd); |
84778508 | 829 | |
98b34d35 WL |
830 | bprm->p = target_create_elf_tables(bprm->p, bprm->argc, bprm->envc, |
831 | bprm->stringp, &elf_ex, load_addr, | |
832 | load_bias, interp_load_addr, info); | |
84778508 BS |
833 | info->load_addr = reloc_func_desc; |
834 | info->start_brk = info->brk = elf_brk; | |
835 | info->end_code = end_code; | |
836 | info->start_code = start_code; | |
837 | info->start_data = start_data; | |
838 | info->end_data = end_data; | |
839 | info->start_stack = bprm->p; | |
840 | ||
841 | /* Calling set_brk effectively mmaps the pages that we need for the bss and break | |
842 | sections */ | |
843 | set_brk(elf_bss, elf_brk); | |
844 | ||
845 | padzero(elf_bss, elf_brk); | |
846 | ||
84778508 BS |
847 | info->entry = elf_entry; |
848 | ||
0475f8fa WL |
849 | #ifdef USE_ELF_CORE_DUMP |
850 | bprm->core_dump = &elf_core_dump; | |
851 | #else | |
852 | bprm->core_dump = NULL; | |
853 | #endif | |
854 | ||
84778508 BS |
855 | return 0; |
856 | } | |
857 | ||
84778508 BS |
858 | void do_init_thread(struct target_pt_regs *regs, struct image_info *infop) |
859 | { | |
a8fe6d5d WL |
860 | |
861 | target_thread_init(regs, infop); | |
84778508 | 862 | } |