]>
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 | |
66ef252f WL |
26 | #include "target_arch_elf.h" |
27 | ||
84778508 BS |
28 | /* from personality.h */ |
29 | ||
30 | /* | |
31 | * Flags for bug emulation. | |
32 | * | |
33 | * These occupy the top three bytes. | |
34 | */ | |
35 | enum { | |
36 | ADDR_NO_RANDOMIZE = 0x0040000, /* disable randomization of VA space */ | |
37 | FDPIC_FUNCPTRS = 0x0080000, /* userspace function ptrs point to descriptors | |
38 | * (signal handling) | |
39 | */ | |
40 | MMAP_PAGE_ZERO = 0x0100000, | |
41 | ADDR_COMPAT_LAYOUT = 0x0200000, | |
42 | READ_IMPLIES_EXEC = 0x0400000, | |
43 | ADDR_LIMIT_32BIT = 0x0800000, | |
44 | SHORT_INODE = 0x1000000, | |
45 | WHOLE_SECONDS = 0x2000000, | |
46 | STICKY_TIMEOUTS = 0x4000000, | |
47 | ADDR_LIMIT_3GB = 0x8000000, | |
48 | }; | |
49 | ||
50 | /* | |
51 | * Personality types. | |
52 | * | |
53 | * These go in the low byte. Avoid using the top bit, it will | |
54 | * conflict with error returns. | |
55 | */ | |
56 | enum { | |
57 | PER_LINUX = 0x0000, | |
58 | PER_LINUX_32BIT = 0x0000 | ADDR_LIMIT_32BIT, | |
59 | PER_LINUX_FDPIC = 0x0000 | FDPIC_FUNCPTRS, | |
60 | PER_SVR4 = 0x0001 | STICKY_TIMEOUTS | MMAP_PAGE_ZERO, | |
61 | PER_SVR3 = 0x0002 | STICKY_TIMEOUTS | SHORT_INODE, | |
62 | PER_SCOSVR3 = 0x0003 | STICKY_TIMEOUTS | | |
63 | WHOLE_SECONDS | SHORT_INODE, | |
64 | PER_OSR5 = 0x0003 | STICKY_TIMEOUTS | WHOLE_SECONDS, | |
65 | PER_WYSEV386 = 0x0004 | STICKY_TIMEOUTS | SHORT_INODE, | |
66 | PER_ISCR4 = 0x0005 | STICKY_TIMEOUTS, | |
67 | PER_BSD = 0x0006, | |
68 | PER_SUNOS = 0x0006 | STICKY_TIMEOUTS, | |
69 | PER_XENIX = 0x0007 | STICKY_TIMEOUTS | SHORT_INODE, | |
70 | PER_LINUX32 = 0x0008, | |
71 | PER_LINUX32_3GB = 0x0008 | ADDR_LIMIT_3GB, | |
72 | PER_IRIX32 = 0x0009 | STICKY_TIMEOUTS,/* IRIX5 32-bit */ | |
73 | PER_IRIXN32 = 0x000a | STICKY_TIMEOUTS,/* IRIX6 new 32-bit */ | |
74 | PER_IRIX64 = 0x000b | STICKY_TIMEOUTS,/* IRIX6 64-bit */ | |
75 | PER_RISCOS = 0x000c, | |
76 | PER_SOLARIS = 0x000d | STICKY_TIMEOUTS, | |
77 | PER_UW7 = 0x000e | STICKY_TIMEOUTS | MMAP_PAGE_ZERO, | |
78 | PER_OSF4 = 0x000f, /* OSF/1 v4 */ | |
79 | PER_HPUX = 0x0010, | |
80 | PER_MASK = 0x00ff, | |
81 | }; | |
82 | ||
83 | /* | |
84 | * Return the base personality without flags. | |
85 | */ | |
86 | #define personality(pers) (pers & PER_MASK) | |
87 | ||
88 | /* this flag is uneffective under linux too, should be deleted */ | |
89 | #ifndef MAP_DENYWRITE | |
90 | #define MAP_DENYWRITE 0 | |
91 | #endif | |
92 | ||
93 | /* should probably go in elf.h */ | |
94 | #ifndef ELIBBAD | |
95 | #define ELIBBAD 80 | |
96 | #endif | |
97 | ||
84778508 BS |
98 | #ifndef ELF_PLATFORM |
99 | #define ELF_PLATFORM (NULL) | |
100 | #endif | |
101 | ||
102 | #ifndef ELF_HWCAP | |
103 | #define ELF_HWCAP 0 | |
104 | #endif | |
105 | ||
106 | #ifdef TARGET_ABI32 | |
107 | #undef ELF_CLASS | |
108 | #define ELF_CLASS ELFCLASS32 | |
109 | #undef bswaptls | |
110 | #define bswaptls(ptr) bswap32s(ptr) | |
111 | #endif | |
112 | ||
113 | #include "elf.h" | |
114 | ||
115 | struct exec | |
116 | { | |
117 | unsigned int a_info; /* Use macros N_MAGIC, etc for access */ | |
118 | unsigned int a_text; /* length of text, in bytes */ | |
119 | unsigned int a_data; /* length of data, in bytes */ | |
120 | unsigned int a_bss; /* length of uninitialized data area, in bytes */ | |
121 | unsigned int a_syms; /* length of symbol table data in file, in bytes */ | |
122 | unsigned int a_entry; /* start address */ | |
123 | unsigned int a_trsize; /* length of relocation info for text, in bytes */ | |
124 | unsigned int a_drsize; /* length of relocation info for data, in bytes */ | |
125 | }; | |
126 | ||
127 | ||
128 | #define N_MAGIC(exec) ((exec).a_info & 0xffff) | |
129 | #define OMAGIC 0407 | |
130 | #define NMAGIC 0410 | |
131 | #define ZMAGIC 0413 | |
132 | #define QMAGIC 0314 | |
133 | ||
134 | /* max code+data+bss space allocated to elf interpreter */ | |
135 | #define INTERP_MAP_SIZE (32 * 1024 * 1024) | |
136 | ||
137 | /* max code+data+bss+brk space allocated to ET_DYN executables */ | |
138 | #define ET_DYN_MAP_SIZE (128 * 1024 * 1024) | |
139 | ||
140 | /* Necessary parameters */ | |
141 | #define TARGET_ELF_EXEC_PAGESIZE TARGET_PAGE_SIZE | |
b4bebeee WL |
142 | #define TARGET_ELF_PAGESTART(_v) ((_v) & ~(unsigned long)(TARGET_ELF_EXEC_PAGESIZE - 1)) |
143 | #define TARGET_ELF_PAGEOFFSET(_v) ((_v) & (TARGET_ELF_EXEC_PAGESIZE - 1)) | |
84778508 BS |
144 | |
145 | #define INTERPRETER_NONE 0 | |
146 | #define INTERPRETER_AOUT 1 | |
147 | #define INTERPRETER_ELF 2 | |
148 | ||
149 | #define DLINFO_ITEMS 12 | |
150 | ||
b4bebeee | 151 | static inline void memcpy_fromfs(void *to, const void *from, unsigned long n) |
84778508 BS |
152 | { |
153 | memcpy(to, from, n); | |
154 | } | |
155 | ||
b4bebeee | 156 | static int load_aout_interp(void *exptr, int interp_fd); |
84778508 BS |
157 | |
158 | #ifdef BSWAP_NEEDED | |
159 | static void bswap_ehdr(struct elfhdr *ehdr) | |
160 | { | |
161 | bswap16s(&ehdr->e_type); /* Object file type */ | |
162 | bswap16s(&ehdr->e_machine); /* Architecture */ | |
163 | bswap32s(&ehdr->e_version); /* Object file version */ | |
164 | bswaptls(&ehdr->e_entry); /* Entry point virtual address */ | |
165 | bswaptls(&ehdr->e_phoff); /* Program header table file offset */ | |
166 | bswaptls(&ehdr->e_shoff); /* Section header table file offset */ | |
167 | bswap32s(&ehdr->e_flags); /* Processor-specific flags */ | |
168 | bswap16s(&ehdr->e_ehsize); /* ELF header size in bytes */ | |
169 | bswap16s(&ehdr->e_phentsize); /* Program header table entry size */ | |
170 | bswap16s(&ehdr->e_phnum); /* Program header table entry count */ | |
171 | bswap16s(&ehdr->e_shentsize); /* Section header table entry size */ | |
172 | bswap16s(&ehdr->e_shnum); /* Section header table entry count */ | |
173 | bswap16s(&ehdr->e_shstrndx); /* Section header string table index */ | |
174 | } | |
175 | ||
176 | static void bswap_phdr(struct elf_phdr *phdr) | |
177 | { | |
178 | bswap32s(&phdr->p_type); /* Segment type */ | |
179 | bswaptls(&phdr->p_offset); /* Segment file offset */ | |
180 | bswaptls(&phdr->p_vaddr); /* Segment virtual address */ | |
181 | bswaptls(&phdr->p_paddr); /* Segment physical address */ | |
182 | bswaptls(&phdr->p_filesz); /* Segment size in file */ | |
183 | bswaptls(&phdr->p_memsz); /* Segment size in memory */ | |
184 | bswap32s(&phdr->p_flags); /* Segment flags */ | |
185 | bswaptls(&phdr->p_align); /* Segment alignment */ | |
186 | } | |
187 | ||
188 | static void bswap_shdr(struct elf_shdr *shdr) | |
189 | { | |
190 | bswap32s(&shdr->sh_name); | |
191 | bswap32s(&shdr->sh_type); | |
192 | bswaptls(&shdr->sh_flags); | |
193 | bswaptls(&shdr->sh_addr); | |
194 | bswaptls(&shdr->sh_offset); | |
195 | bswaptls(&shdr->sh_size); | |
196 | bswap32s(&shdr->sh_link); | |
197 | bswap32s(&shdr->sh_info); | |
198 | bswaptls(&shdr->sh_addralign); | |
199 | bswaptls(&shdr->sh_entsize); | |
200 | } | |
201 | ||
202 | static void bswap_sym(struct elf_sym *sym) | |
203 | { | |
204 | bswap32s(&sym->st_name); | |
205 | bswaptls(&sym->st_value); | |
206 | bswaptls(&sym->st_size); | |
207 | bswap16s(&sym->st_shndx); | |
208 | } | |
209 | #endif | |
210 | ||
211 | /* | |
212 | * 'copy_elf_strings()' copies argument/envelope strings from user | |
213 | * memory to free pages in kernel mem. These are in a format ready | |
214 | * to be put directly into the top of new user memory. | |
215 | * | |
216 | */ | |
b4bebeee | 217 | static abi_ulong copy_elf_strings(int argc, char **argv, void **page, |
84778508 BS |
218 | abi_ulong p) |
219 | { | |
220 | char *tmp, *tmp1, *pag = NULL; | |
221 | int len, offset = 0; | |
222 | ||
223 | if (!p) { | |
224 | return 0; /* bullet-proofing */ | |
225 | } | |
226 | while (argc-- > 0) { | |
227 | tmp = argv[argc]; | |
228 | if (!tmp) { | |
9bb93180 | 229 | fprintf(stderr, "VFS: argc is wrong"); |
84778508 BS |
230 | exit(-1); |
231 | } | |
232 | tmp1 = tmp; | |
233 | while (*tmp++); | |
234 | len = tmp - tmp1; | |
235 | if (p < len) { /* this shouldn't happen - 128kB */ | |
236 | return 0; | |
237 | } | |
238 | while (len) { | |
239 | --p; --tmp; --len; | |
240 | if (--offset < 0) { | |
241 | offset = p % TARGET_PAGE_SIZE; | |
b4bebeee | 242 | pag = (char *)page[p / TARGET_PAGE_SIZE]; |
84778508 | 243 | if (!pag) { |
c580dee4 | 244 | pag = g_try_malloc0(TARGET_PAGE_SIZE); |
b4bebeee | 245 | page[p / TARGET_PAGE_SIZE] = pag; |
84778508 BS |
246 | if (!pag) |
247 | return 0; | |
248 | } | |
249 | } | |
250 | if (len == 0 || offset == 0) { | |
251 | *(pag + offset) = *tmp; | |
252 | } | |
253 | else { | |
254 | int bytes_to_copy = (len > offset) ? offset : len; | |
255 | tmp -= bytes_to_copy; | |
256 | p -= bytes_to_copy; | |
257 | offset -= bytes_to_copy; | |
258 | len -= bytes_to_copy; | |
259 | memcpy_fromfs(pag + offset, tmp, bytes_to_copy + 1); | |
260 | } | |
261 | } | |
262 | } | |
263 | return p; | |
264 | } | |
265 | ||
afcbcff8 | 266 | static abi_ulong setup_arg_pages(abi_ulong p, struct bsd_binprm *bprm, |
84778508 BS |
267 | struct image_info *info) |
268 | { | |
269 | abi_ulong stack_base, size, error; | |
270 | int i; | |
271 | ||
272 | /* Create enough stack to hold everything. If we don't use | |
273 | * it for args, we'll use it for something else... | |
274 | */ | |
275 | size = x86_stack_size; | |
b4bebeee WL |
276 | if (size < MAX_ARG_PAGES * TARGET_PAGE_SIZE) |
277 | size = MAX_ARG_PAGES * TARGET_PAGE_SIZE; | |
84778508 BS |
278 | error = target_mmap(0, |
279 | size + qemu_host_page_size, | |
280 | PROT_READ | PROT_WRITE, | |
281 | MAP_PRIVATE | MAP_ANON, | |
282 | -1, 0); | |
283 | if (error == -1) { | |
284 | perror("stk mmap"); | |
285 | exit(-1); | |
286 | } | |
287 | /* we reserve one extra page at the top of the stack as guard */ | |
288 | target_mprotect(error + size, qemu_host_page_size, PROT_NONE); | |
289 | ||
b4bebeee | 290 | stack_base = error + size - MAX_ARG_PAGES * TARGET_PAGE_SIZE; |
84778508 BS |
291 | p += stack_base; |
292 | ||
293 | for (i = 0 ; i < MAX_ARG_PAGES ; i++) { | |
294 | if (bprm->page[i]) { | |
295 | info->rss++; | |
296 | /* FIXME - check return value of memcpy_to_target() for failure */ | |
297 | memcpy_to_target(stack_base, bprm->page[i], TARGET_PAGE_SIZE); | |
c580dee4 | 298 | g_free(bprm->page[i]); |
84778508 BS |
299 | } |
300 | stack_base += TARGET_PAGE_SIZE; | |
301 | } | |
302 | return p; | |
303 | } | |
304 | ||
305 | static void set_brk(abi_ulong start, abi_ulong end) | |
306 | { | |
307 | /* page-align the start and end addresses... */ | |
308 | start = HOST_PAGE_ALIGN(start); | |
309 | end = HOST_PAGE_ALIGN(end); | |
310 | if (end <= start) | |
311 | return; | |
b4bebeee | 312 | if (target_mmap(start, end - start, |
84778508 BS |
313 | PROT_READ | PROT_WRITE | PROT_EXEC, |
314 | MAP_FIXED | MAP_PRIVATE | MAP_ANON, -1, 0) == -1) { | |
315 | perror("cannot mmap brk"); | |
316 | exit(-1); | |
317 | } | |
318 | } | |
319 | ||
320 | ||
321 | /* We need to explicitly zero any fractional pages after the data | |
322 | section (i.e. bss). This would contain the junk from the file that | |
323 | should not be in memory. */ | |
324 | static void padzero(abi_ulong elf_bss, abi_ulong last_bss) | |
325 | { | |
326 | abi_ulong nbyte; | |
327 | ||
328 | if (elf_bss >= last_bss) | |
329 | return; | |
330 | ||
331 | /* XXX: this is really a hack : if the real host page size is | |
332 | smaller than the target page size, some pages after the end | |
333 | of the file may not be mapped. A better fix would be to | |
334 | patch target_mmap(), but it is more complicated as the file | |
335 | size must be known */ | |
336 | if (qemu_real_host_page_size < qemu_host_page_size) { | |
337 | abi_ulong end_addr, end_addr1; | |
0c2d70c4 | 338 | end_addr1 = REAL_HOST_PAGE_ALIGN(elf_bss); |
84778508 BS |
339 | end_addr = HOST_PAGE_ALIGN(elf_bss); |
340 | if (end_addr1 < end_addr) { | |
3e8f1628 | 341 | mmap((void *)g2h_untagged(end_addr1), end_addr - end_addr1, |
b4bebeee WL |
342 | PROT_READ | PROT_WRITE | PROT_EXEC, |
343 | MAP_FIXED | MAP_PRIVATE | MAP_ANON, -1, 0); | |
84778508 BS |
344 | } |
345 | } | |
346 | ||
b4bebeee | 347 | nbyte = elf_bss & (qemu_host_page_size - 1); |
84778508 BS |
348 | if (nbyte) { |
349 | nbyte = qemu_host_page_size - nbyte; | |
350 | do { | |
351 | /* FIXME - what to do if put_user() fails? */ | |
352 | put_user_u8(0, elf_bss); | |
353 | elf_bss++; | |
354 | } while (--nbyte); | |
355 | } | |
356 | } | |
357 | ||
358 | ||
359 | static abi_ulong create_elf_tables(abi_ulong p, int argc, int envc, | |
360 | struct elfhdr * exec, | |
361 | abi_ulong load_addr, | |
362 | abi_ulong load_bias, | |
363 | abi_ulong interp_load_addr, int ibcs, | |
364 | struct image_info *info) | |
365 | { | |
366 | abi_ulong sp; | |
367 | int size; | |
368 | abi_ulong u_platform; | |
369 | const char *k_platform; | |
370 | const int n = sizeof(elf_addr_t); | |
371 | ||
372 | sp = p; | |
373 | u_platform = 0; | |
374 | k_platform = ELF_PLATFORM; | |
375 | if (k_platform) { | |
376 | size_t len = strlen(k_platform) + 1; | |
377 | sp -= (len + n - 1) & ~(n - 1); | |
378 | u_platform = sp; | |
379 | /* FIXME - check return value of memcpy_to_target() for failure */ | |
380 | memcpy_to_target(sp, k_platform, len); | |
381 | } | |
382 | /* | |
383 | * Force 16 byte _final_ alignment here for generality. | |
384 | */ | |
b4bebeee | 385 | sp = sp & ~(abi_ulong)15; |
84778508 BS |
386 | size = (DLINFO_ITEMS + 1) * 2; |
387 | if (k_platform) | |
b4bebeee | 388 | size += 2; |
84778508 BS |
389 | #ifdef DLINFO_ARCH_ITEMS |
390 | size += DLINFO_ARCH_ITEMS * 2; | |
391 | #endif | |
392 | size += envc + argc + 2; | |
393 | size += (!ibcs ? 3 : 1); /* argc itself */ | |
394 | size *= n; | |
395 | if (size & 15) | |
b4bebeee | 396 | sp -= 16 - (size & 15); |
84778508 BS |
397 | |
398 | /* This is correct because Linux defines | |
399 | * elf_addr_t as Elf32_Off / Elf64_Off | |
400 | */ | |
401 | #define NEW_AUX_ENT(id, val) do { \ | |
402 | sp -= n; put_user_ual(val, sp); \ | |
403 | sp -= n; put_user_ual(id, sp); \ | |
b4bebeee | 404 | } while (0) |
84778508 | 405 | |
b4bebeee | 406 | NEW_AUX_ENT(AT_NULL, 0); |
84778508 BS |
407 | |
408 | /* There must be exactly DLINFO_ITEMS entries here. */ | |
409 | NEW_AUX_ENT(AT_PHDR, (abi_ulong)(load_addr + exec->e_phoff)); | |
b4bebeee | 410 | NEW_AUX_ENT(AT_PHENT, (abi_ulong)(sizeof(struct elf_phdr))); |
84778508 BS |
411 | NEW_AUX_ENT(AT_PHNUM, (abi_ulong)(exec->e_phnum)); |
412 | NEW_AUX_ENT(AT_PAGESZ, (abi_ulong)(TARGET_PAGE_SIZE)); | |
413 | NEW_AUX_ENT(AT_BASE, (abi_ulong)(interp_load_addr)); | |
414 | NEW_AUX_ENT(AT_FLAGS, (abi_ulong)0); | |
415 | NEW_AUX_ENT(AT_ENTRY, load_bias + exec->e_entry); | |
416 | NEW_AUX_ENT(AT_UID, (abi_ulong) getuid()); | |
417 | NEW_AUX_ENT(AT_EUID, (abi_ulong) geteuid()); | |
418 | NEW_AUX_ENT(AT_GID, (abi_ulong) getgid()); | |
419 | NEW_AUX_ENT(AT_EGID, (abi_ulong) getegid()); | |
420 | NEW_AUX_ENT(AT_HWCAP, (abi_ulong) ELF_HWCAP); | |
421 | NEW_AUX_ENT(AT_CLKTCK, (abi_ulong) sysconf(_SC_CLK_TCK)); | |
422 | if (k_platform) | |
423 | NEW_AUX_ENT(AT_PLATFORM, u_platform); | |
424 | #ifdef ARCH_DLINFO | |
425 | /* | |
426 | * ARCH_DLINFO must come last so platform specific code can enforce | |
427 | * special alignment requirements on the AUXV if necessary (eg. PPC). | |
428 | */ | |
429 | ARCH_DLINFO; | |
430 | #endif | |
431 | #undef NEW_AUX_ENT | |
432 | ||
433 | sp = loader_build_argptr(envc, argc, sp, p, !ibcs); | |
434 | return sp; | |
435 | } | |
436 | ||
437 | ||
b4bebeee | 438 | static abi_ulong load_elf_interp(struct elfhdr *interp_elf_ex, |
84778508 BS |
439 | int interpreter_fd, |
440 | abi_ulong *interp_load_addr) | |
441 | { | |
b4bebeee WL |
442 | struct elf_phdr *elf_phdata = NULL; |
443 | struct elf_phdr *eppnt; | |
444 | abi_ulong load_addr = 0; | |
445 | int load_addr_set = 0; | |
446 | int retval; | |
447 | abi_ulong last_bss, elf_bss; | |
448 | abi_ulong error; | |
449 | int i; | |
84778508 | 450 | |
b4bebeee WL |
451 | elf_bss = 0; |
452 | last_bss = 0; | |
453 | error = 0; | |
84778508 BS |
454 | |
455 | #ifdef BSWAP_NEEDED | |
b4bebeee | 456 | bswap_ehdr(interp_elf_ex); |
84778508 | 457 | #endif |
b4bebeee WL |
458 | /* First of all, some simple consistency checks */ |
459 | if ((interp_elf_ex->e_type != ET_EXEC && | |
460 | interp_elf_ex->e_type != ET_DYN) || | |
461 | !elf_check_arch(interp_elf_ex->e_machine)) { | |
462 | return ~((abi_ulong)0UL); | |
463 | } | |
84778508 BS |
464 | |
465 | ||
b4bebeee | 466 | /* Now read in all of the header information */ |
84778508 | 467 | |
b4bebeee WL |
468 | if (sizeof(struct elf_phdr) * interp_elf_ex->e_phnum > TARGET_PAGE_SIZE) |
469 | return ~(abi_ulong)0UL; | |
84778508 | 470 | |
b4bebeee WL |
471 | elf_phdata = (struct elf_phdr *) |
472 | malloc(sizeof(struct elf_phdr) * interp_elf_ex->e_phnum); | |
84778508 | 473 | |
b4bebeee WL |
474 | if (!elf_phdata) |
475 | return ~((abi_ulong)0UL); | |
84778508 | 476 | |
b4bebeee WL |
477 | /* |
478 | * If the size of this structure has changed, then punt, since | |
479 | * we will be doing the wrong thing. | |
480 | */ | |
481 | if (interp_elf_ex->e_phentsize != sizeof(struct elf_phdr)) { | |
482 | free(elf_phdata); | |
483 | return ~((abi_ulong)0UL); | |
484 | } | |
84778508 | 485 | |
b4bebeee WL |
486 | retval = lseek(interpreter_fd, interp_elf_ex->e_phoff, SEEK_SET); |
487 | if (retval >= 0) { | |
488 | retval = read(interpreter_fd, | |
489 | (char *) elf_phdata, | |
490 | sizeof(struct elf_phdr) * interp_elf_ex->e_phnum); | |
491 | } | |
492 | if (retval < 0) { | |
493 | perror("load_elf_interp"); | |
494 | exit(-1); | |
495 | free (elf_phdata); | |
496 | return retval; | |
497 | } | |
84778508 | 498 | #ifdef BSWAP_NEEDED |
b4bebeee WL |
499 | eppnt = elf_phdata; |
500 | for (i = 0; i<interp_elf_ex->e_phnum; i++, eppnt++) { | |
501 | bswap_phdr(eppnt); | |
502 | } | |
84778508 BS |
503 | #endif |
504 | ||
b4bebeee WL |
505 | if (interp_elf_ex->e_type == ET_DYN) { |
506 | /* in order to avoid hardcoding the interpreter load | |
507 | address in qemu, we allocate a big enough memory zone */ | |
508 | error = target_mmap(0, INTERP_MAP_SIZE, | |
509 | PROT_NONE, MAP_PRIVATE | MAP_ANON, | |
510 | -1, 0); | |
511 | if (error == -1) { | |
512 | perror("mmap"); | |
513 | exit(-1); | |
84778508 | 514 | } |
b4bebeee WL |
515 | load_addr = error; |
516 | load_addr_set = 1; | |
517 | } | |
84778508 | 518 | |
b4bebeee WL |
519 | eppnt = elf_phdata; |
520 | for (i = 0; i < interp_elf_ex->e_phnum; i++, eppnt++) | |
521 | if (eppnt->p_type == PT_LOAD) { | |
84778508 BS |
522 | int elf_type = MAP_PRIVATE | MAP_DENYWRITE; |
523 | int elf_prot = 0; | |
524 | abi_ulong vaddr = 0; | |
525 | abi_ulong k; | |
526 | ||
527 | if (eppnt->p_flags & PF_R) elf_prot = PROT_READ; | |
528 | if (eppnt->p_flags & PF_W) elf_prot |= PROT_WRITE; | |
529 | if (eppnt->p_flags & PF_X) elf_prot |= PROT_EXEC; | |
530 | if (interp_elf_ex->e_type == ET_EXEC || load_addr_set) { | |
531 | elf_type |= MAP_FIXED; | |
532 | vaddr = eppnt->p_vaddr; | |
533 | } | |
b4bebeee WL |
534 | error = target_mmap(load_addr + TARGET_ELF_PAGESTART(vaddr), |
535 | eppnt->p_filesz + TARGET_ELF_PAGEOFFSET(eppnt->p_vaddr), | |
536 | elf_prot, | |
537 | elf_type, | |
538 | interpreter_fd, | |
539 | eppnt->p_offset - TARGET_ELF_PAGEOFFSET(eppnt->p_vaddr)); | |
84778508 BS |
540 | |
541 | if (error == -1) { | |
b4bebeee WL |
542 | /* Real error */ |
543 | close(interpreter_fd); | |
544 | free(elf_phdata); | |
545 | return ~((abi_ulong)0UL); | |
84778508 BS |
546 | } |
547 | ||
548 | if (!load_addr_set && interp_elf_ex->e_type == ET_DYN) { | |
b4bebeee WL |
549 | load_addr = error; |
550 | load_addr_set = 1; | |
84778508 BS |
551 | } |
552 | ||
553 | /* | |
554 | * Find the end of the file mapping for this phdr, and keep | |
555 | * track of the largest address we see for this. | |
556 | */ | |
557 | k = load_addr + eppnt->p_vaddr + eppnt->p_filesz; | |
558 | if (k > elf_bss) elf_bss = k; | |
559 | ||
560 | /* | |
561 | * Do the same thing for the memory mapping - between | |
562 | * elf_bss and last_bss is the bss section. | |
563 | */ | |
564 | k = load_addr + eppnt->p_memsz + eppnt->p_vaddr; | |
565 | if (k > last_bss) last_bss = k; | |
b4bebeee | 566 | } |
84778508 | 567 | |
b4bebeee | 568 | /* Now use mmap to map the library into memory. */ |
84778508 | 569 | |
b4bebeee | 570 | close(interpreter_fd); |
84778508 | 571 | |
b4bebeee WL |
572 | /* |
573 | * Now fill out the bss section. First pad the last page up | |
574 | * to the page boundary, and then perform a mmap to make sure | |
575 | * that there are zeromapped pages up to and including the last | |
576 | * bss page. | |
577 | */ | |
578 | padzero(elf_bss, last_bss); | |
579 | elf_bss = TARGET_ELF_PAGESTART(elf_bss + qemu_host_page_size - 1); /* What we have mapped so far */ | |
580 | ||
581 | /* Map the last of the bss segment */ | |
582 | if (last_bss > elf_bss) { | |
583 | target_mmap(elf_bss, last_bss - elf_bss, | |
584 | PROT_READ | PROT_WRITE | PROT_EXEC, | |
585 | MAP_FIXED | MAP_PRIVATE | MAP_ANON, -1, 0); | |
586 | } | |
587 | free(elf_phdata); | |
84778508 | 588 | |
b4bebeee WL |
589 | *interp_load_addr = load_addr; |
590 | return ((abi_ulong) interp_elf_ex->e_entry) + load_addr; | |
84778508 BS |
591 | } |
592 | ||
593 | static int symfind(const void *s0, const void *s1) | |
594 | { | |
c7c530cd | 595 | target_ulong addr = *(target_ulong *)s0; |
84778508 BS |
596 | struct elf_sym *sym = (struct elf_sym *)s1; |
597 | int result = 0; | |
c7c530cd | 598 | if (addr < sym->st_value) { |
84778508 | 599 | result = -1; |
c7c530cd | 600 | } else if (addr >= sym->st_value + sym->st_size) { |
84778508 BS |
601 | result = 1; |
602 | } | |
603 | return result; | |
604 | } | |
605 | ||
606 | static const char *lookup_symbolxx(struct syminfo *s, target_ulong orig_addr) | |
607 | { | |
608 | #if ELF_CLASS == ELFCLASS32 | |
609 | struct elf_sym *syms = s->disas_symtab.elf32; | |
610 | #else | |
611 | struct elf_sym *syms = s->disas_symtab.elf64; | |
612 | #endif | |
613 | ||
614 | // binary search | |
84778508 BS |
615 | struct elf_sym *sym; |
616 | ||
c7c530cd | 617 | sym = bsearch(&orig_addr, syms, s->disas_num_syms, sizeof(*syms), symfind); |
7cba04f6 | 618 | if (sym != NULL) { |
84778508 BS |
619 | return s->disas_strtab + sym->st_name; |
620 | } | |
621 | ||
622 | return ""; | |
623 | } | |
624 | ||
625 | /* FIXME: This should use elf_ops.h */ | |
626 | static int symcmp(const void *s0, const void *s1) | |
627 | { | |
628 | struct elf_sym *sym0 = (struct elf_sym *)s0; | |
629 | struct elf_sym *sym1 = (struct elf_sym *)s1; | |
630 | return (sym0->st_value < sym1->st_value) | |
631 | ? -1 | |
632 | : ((sym0->st_value > sym1->st_value) ? 1 : 0); | |
633 | } | |
634 | ||
635 | /* Best attempt to load symbols from this ELF object. */ | |
636 | static void load_symbols(struct elfhdr *hdr, int fd) | |
637 | { | |
638 | unsigned int i, nsyms; | |
639 | struct elf_shdr sechdr, symtab, strtab; | |
640 | char *strings; | |
641 | struct syminfo *s; | |
29718712 | 642 | struct elf_sym *syms, *new_syms; |
84778508 BS |
643 | |
644 | lseek(fd, hdr->e_shoff, SEEK_SET); | |
645 | for (i = 0; i < hdr->e_shnum; i++) { | |
646 | if (read(fd, &sechdr, sizeof(sechdr)) != sizeof(sechdr)) | |
647 | return; | |
648 | #ifdef BSWAP_NEEDED | |
649 | bswap_shdr(&sechdr); | |
650 | #endif | |
651 | if (sechdr.sh_type == SHT_SYMTAB) { | |
652 | symtab = sechdr; | |
653 | lseek(fd, hdr->e_shoff | |
654 | + sizeof(sechdr) * sechdr.sh_link, SEEK_SET); | |
655 | if (read(fd, &strtab, sizeof(strtab)) | |
656 | != sizeof(strtab)) | |
657 | return; | |
658 | #ifdef BSWAP_NEEDED | |
659 | bswap_shdr(&strtab); | |
660 | #endif | |
661 | goto found; | |
662 | } | |
663 | } | |
664 | return; /* Shouldn't happen... */ | |
665 | ||
666 | found: | |
667 | /* Now know where the strtab and symtab are. Snarf them. */ | |
668 | s = malloc(sizeof(*s)); | |
669 | syms = malloc(symtab.sh_size); | |
29718712 SW |
670 | if (!syms) { |
671 | free(s); | |
84778508 | 672 | return; |
29718712 | 673 | } |
84778508 | 674 | s->disas_strtab = strings = malloc(strtab.sh_size); |
29718712 SW |
675 | if (!s->disas_strtab) { |
676 | free(s); | |
677 | free(syms); | |
84778508 | 678 | return; |
29718712 | 679 | } |
84778508 BS |
680 | |
681 | lseek(fd, symtab.sh_offset, SEEK_SET); | |
29718712 SW |
682 | if (read(fd, syms, symtab.sh_size) != symtab.sh_size) { |
683 | free(s); | |
684 | free(syms); | |
685 | free(strings); | |
84778508 | 686 | return; |
29718712 | 687 | } |
84778508 BS |
688 | |
689 | nsyms = symtab.sh_size / sizeof(struct elf_sym); | |
690 | ||
691 | i = 0; | |
692 | while (i < nsyms) { | |
693 | #ifdef BSWAP_NEEDED | |
694 | bswap_sym(syms + i); | |
695 | #endif | |
696 | // Throw away entries which we do not need. | |
697 | if (syms[i].st_shndx == SHN_UNDEF || | |
698 | syms[i].st_shndx >= SHN_LORESERVE || | |
699 | ELF_ST_TYPE(syms[i].st_info) != STT_FUNC) { | |
700 | nsyms--; | |
701 | if (i < nsyms) { | |
702 | syms[i] = syms[nsyms]; | |
703 | } | |
704 | continue; | |
705 | } | |
84778508 BS |
706 | i++; |
707 | } | |
29718712 SW |
708 | |
709 | /* Attempt to free the storage associated with the local symbols | |
710 | that we threw away. Whether or not this has any effect on the | |
711 | memory allocation depends on the malloc implementation and how | |
712 | many symbols we managed to discard. */ | |
713 | new_syms = realloc(syms, nsyms * sizeof(*syms)); | |
714 | if (new_syms == NULL) { | |
715 | free(s); | |
716 | free(syms); | |
717 | free(strings); | |
718 | return; | |
719 | } | |
720 | syms = new_syms; | |
84778508 BS |
721 | |
722 | qsort(syms, nsyms, sizeof(*syms), symcmp); | |
723 | ||
724 | lseek(fd, strtab.sh_offset, SEEK_SET); | |
29718712 SW |
725 | if (read(fd, strings, strtab.sh_size) != strtab.sh_size) { |
726 | free(s); | |
727 | free(syms); | |
728 | free(strings); | |
84778508 | 729 | return; |
29718712 | 730 | } |
84778508 BS |
731 | s->disas_num_syms = nsyms; |
732 | #if ELF_CLASS == ELFCLASS32 | |
733 | s->disas_symtab.elf32 = syms; | |
032e51d7 | 734 | s->lookup_symbol = (lookup_symbol_t)lookup_symbolxx; |
84778508 BS |
735 | #else |
736 | s->disas_symtab.elf64 = syms; | |
032e51d7 | 737 | s->lookup_symbol = (lookup_symbol_t)lookup_symbolxx; |
84778508 BS |
738 | #endif |
739 | s->next = syminfos; | |
740 | syminfos = s; | |
741 | } | |
742 | ||
afcbcff8 | 743 | int load_elf_binary(struct bsd_binprm *bprm, struct target_pt_regs *regs, |
b4bebeee | 744 | struct image_info *info) |
84778508 BS |
745 | { |
746 | struct elfhdr elf_ex; | |
747 | struct elfhdr interp_elf_ex; | |
748 | struct exec interp_ex; | |
749 | int interpreter_fd = -1; /* avoid warning */ | |
750 | abi_ulong load_addr, load_bias; | |
751 | int load_addr_set = 0; | |
752 | unsigned int interpreter_type = INTERPRETER_NONE; | |
753 | unsigned char ibcs2_interpreter; | |
754 | int i; | |
84778508 BS |
755 | struct elf_phdr * elf_ppnt; |
756 | struct elf_phdr *elf_phdata; | |
757 | abi_ulong elf_bss, k, elf_brk; | |
758 | int retval; | |
759 | char * elf_interpreter; | |
760 | abi_ulong elf_entry, interp_load_addr = 0; | |
84778508 BS |
761 | abi_ulong start_code, end_code, start_data, end_data; |
762 | abi_ulong reloc_func_desc = 0; | |
71025956 PM |
763 | #ifdef LOW_ELF_STACK |
764 | abi_ulong elf_stack = ~((abi_ulong)0UL); | |
765 | #endif | |
84778508 BS |
766 | char passed_fileno[6]; |
767 | ||
768 | ibcs2_interpreter = 0; | |
84778508 BS |
769 | load_addr = 0; |
770 | load_bias = 0; | |
771 | elf_ex = *((struct elfhdr *) bprm->buf); /* exec-header */ | |
772 | #ifdef BSWAP_NEEDED | |
773 | bswap_ehdr(&elf_ex); | |
774 | #endif | |
775 | ||
776 | /* First of all, some simple consistency checks */ | |
777 | if ((elf_ex.e_type != ET_EXEC && elf_ex.e_type != ET_DYN) || | |
b4bebeee | 778 | (!elf_check_arch(elf_ex.e_machine))) { |
84778508 BS |
779 | return -ENOEXEC; |
780 | } | |
781 | ||
782 | bprm->p = copy_elf_strings(1, &bprm->filename, bprm->page, bprm->p); | |
b4bebeee WL |
783 | bprm->p = copy_elf_strings(bprm->envc, bprm->envp, bprm->page,bprm->p); |
784 | bprm->p = copy_elf_strings(bprm->argc, bprm->argv, bprm->page,bprm->p); | |
84778508 BS |
785 | if (!bprm->p) { |
786 | retval = -E2BIG; | |
787 | } | |
788 | ||
789 | /* Now read in all of the header information */ | |
790 | elf_phdata = (struct elf_phdr *)malloc(elf_ex.e_phentsize*elf_ex.e_phnum); | |
791 | if (elf_phdata == NULL) { | |
792 | return -ENOMEM; | |
793 | } | |
794 | ||
795 | retval = lseek(bprm->fd, elf_ex.e_phoff, SEEK_SET); | |
b4bebeee WL |
796 | if (retval > 0) { |
797 | retval = read(bprm->fd, (char *)elf_phdata, | |
84778508 BS |
798 | elf_ex.e_phentsize * elf_ex.e_phnum); |
799 | } | |
800 | ||
801 | if (retval < 0) { | |
802 | perror("load_elf_binary"); | |
803 | exit(-1); | |
b4bebeee | 804 | free(elf_phdata); |
84778508 BS |
805 | return -errno; |
806 | } | |
807 | ||
808 | #ifdef BSWAP_NEEDED | |
809 | elf_ppnt = elf_phdata; | |
b4bebeee | 810 | for (i = 0; i < elf_ex.e_phnum; i++, elf_ppnt++) { |
84778508 BS |
811 | bswap_phdr(elf_ppnt); |
812 | } | |
813 | #endif | |
814 | elf_ppnt = elf_phdata; | |
815 | ||
816 | elf_bss = 0; | |
817 | elf_brk = 0; | |
818 | ||
819 | ||
84778508 BS |
820 | elf_interpreter = NULL; |
821 | start_code = ~((abi_ulong)0UL); | |
822 | end_code = 0; | |
823 | start_data = 0; | |
824 | end_data = 0; | |
825 | interp_ex.a_info = 0; | |
826 | ||
b4bebeee | 827 | for (i = 0;i < elf_ex.e_phnum; i++) { |
84778508 | 828 | if (elf_ppnt->p_type == PT_INTERP) { |
b4bebeee | 829 | if (elf_interpreter != NULL) |
84778508 | 830 | { |
b4bebeee | 831 | free(elf_phdata); |
84778508 BS |
832 | free(elf_interpreter); |
833 | close(bprm->fd); | |
834 | return -EINVAL; | |
835 | } | |
836 | ||
837 | /* This is the program interpreter used for | |
838 | * shared libraries - for now assume that this | |
839 | * is an a.out format binary | |
840 | */ | |
841 | ||
842 | elf_interpreter = (char *)malloc(elf_ppnt->p_filesz); | |
843 | ||
844 | if (elf_interpreter == NULL) { | |
b4bebeee | 845 | free(elf_phdata); |
84778508 BS |
846 | close(bprm->fd); |
847 | return -ENOMEM; | |
848 | } | |
849 | ||
850 | retval = lseek(bprm->fd, elf_ppnt->p_offset, SEEK_SET); | |
b4bebeee | 851 | if (retval >= 0) { |
84778508 BS |
852 | retval = read(bprm->fd, elf_interpreter, elf_ppnt->p_filesz); |
853 | } | |
b4bebeee | 854 | if (retval < 0) { |
84778508 BS |
855 | perror("load_elf_binary2"); |
856 | exit(-1); | |
857 | } | |
858 | ||
859 | /* If the program interpreter is one of these two, | |
860 | then assume an iBCS2 image. Otherwise assume | |
861 | a native linux image. */ | |
862 | ||
863 | /* JRP - Need to add X86 lib dir stuff here... */ | |
864 | ||
b4bebeee WL |
865 | if (strcmp(elf_interpreter, "/usr/lib/libc.so.1") == 0 || |
866 | strcmp(elf_interpreter, "/usr/lib/ld.so.1") == 0) { | |
84778508 BS |
867 | ibcs2_interpreter = 1; |
868 | } | |
869 | ||
870 | #if 0 | |
b7d43d03 | 871 | printf("Using ELF interpreter %s\n", path(elf_interpreter)); |
84778508 BS |
872 | #endif |
873 | if (retval >= 0) { | |
874 | retval = open(path(elf_interpreter), O_RDONLY); | |
b4bebeee | 875 | if (retval >= 0) { |
84778508 BS |
876 | interpreter_fd = retval; |
877 | } | |
878 | else { | |
879 | perror(elf_interpreter); | |
880 | exit(-1); | |
881 | /* retval = -errno; */ | |
882 | } | |
883 | } | |
884 | ||
885 | if (retval >= 0) { | |
886 | retval = lseek(interpreter_fd, 0, SEEK_SET); | |
b4bebeee WL |
887 | if (retval >= 0) { |
888 | retval = read(interpreter_fd, bprm->buf, 128); | |
84778508 BS |
889 | } |
890 | } | |
891 | if (retval >= 0) { | |
892 | interp_ex = *((struct exec *) bprm->buf); /* aout exec-header */ | |
6ece4df6 | 893 | interp_elf_ex = *((struct elfhdr *) bprm->buf); /* elf exec-header */ |
84778508 BS |
894 | } |
895 | if (retval < 0) { | |
896 | perror("load_elf_binary3"); | |
897 | exit(-1); | |
b4bebeee | 898 | free(elf_phdata); |
84778508 BS |
899 | free(elf_interpreter); |
900 | close(bprm->fd); | |
901 | return retval; | |
902 | } | |
903 | } | |
904 | elf_ppnt++; | |
905 | } | |
906 | ||
907 | /* Some simple consistency checks for the interpreter */ | |
b4bebeee | 908 | if (elf_interpreter) { |
84778508 BS |
909 | interpreter_type = INTERPRETER_ELF | INTERPRETER_AOUT; |
910 | ||
911 | /* Now figure out which format our binary is */ | |
912 | if ((N_MAGIC(interp_ex) != OMAGIC) && (N_MAGIC(interp_ex) != ZMAGIC) && | |
913 | (N_MAGIC(interp_ex) != QMAGIC)) { | |
b4bebeee | 914 | interpreter_type = INTERPRETER_ELF; |
84778508 BS |
915 | } |
916 | ||
917 | if (interp_elf_ex.e_ident[0] != 0x7f || | |
b4bebeee | 918 | strncmp((char *)&interp_elf_ex.e_ident[1], "ELF", 3) != 0) { |
84778508 BS |
919 | interpreter_type &= ~INTERPRETER_ELF; |
920 | } | |
921 | ||
922 | if (!interpreter_type) { | |
923 | free(elf_interpreter); | |
924 | free(elf_phdata); | |
925 | close(bprm->fd); | |
926 | return -ELIBBAD; | |
927 | } | |
928 | } | |
929 | ||
930 | /* OK, we are done with that, now set up the arg stuff, | |
931 | and then start this sucker up */ | |
932 | ||
933 | { | |
b4bebeee | 934 | char *passed_p; |
84778508 BS |
935 | |
936 | if (interpreter_type == INTERPRETER_AOUT) { | |
937 | snprintf(passed_fileno, sizeof(passed_fileno), "%d", bprm->fd); | |
938 | passed_p = passed_fileno; | |
939 | ||
940 | if (elf_interpreter) { | |
b4bebeee | 941 | bprm->p = copy_elf_strings(1, &passed_p, bprm->page, bprm->p); |
84778508 BS |
942 | bprm->argc++; |
943 | } | |
944 | } | |
945 | if (!bprm->p) { | |
ef1e1e07 | 946 | free(elf_interpreter); |
b4bebeee | 947 | free(elf_phdata); |
84778508 BS |
948 | close(bprm->fd); |
949 | return -E2BIG; | |
950 | } | |
951 | } | |
952 | ||
953 | /* OK, This is the point of no return */ | |
954 | info->end_data = 0; | |
955 | info->end_code = 0; | |
956 | info->start_mmap = (abi_ulong)ELF_START_MMAP; | |
957 | info->mmap = 0; | |
958 | elf_entry = (abi_ulong) elf_ex.e_entry; | |
959 | ||
2fa5d9ba BS |
960 | /* |
961 | * In case where user has not explicitly set the guest_base, we | |
962 | * probe here that should we set it automatically. | |
963 | */ | |
964 | if (!have_guest_base) { | |
965 | /* | |
966 | * Go through ELF program header table and find out whether | |
7d37435b | 967 | * any of the segments drop below our current mmap_min_addr and |
2fa5d9ba BS |
968 | * in that case set guest_base to corresponding address. |
969 | */ | |
970 | for (i = 0, elf_ppnt = elf_phdata; i < elf_ex.e_phnum; | |
971 | i++, elf_ppnt++) { | |
972 | if (elf_ppnt->p_type != PT_LOAD) | |
973 | continue; | |
974 | if (HOST_PAGE_ALIGN(elf_ppnt->p_vaddr) < mmap_min_addr) { | |
975 | guest_base = HOST_PAGE_ALIGN(mmap_min_addr); | |
976 | break; | |
977 | } | |
978 | } | |
979 | } | |
2fa5d9ba | 980 | |
84778508 BS |
981 | /* Do this so that we can load the interpreter, if need be. We will |
982 | change some of these later */ | |
983 | info->rss = 0; | |
984 | bprm->p = setup_arg_pages(bprm->p, bprm, info); | |
985 | info->start_stack = bprm->p; | |
986 | ||
987 | /* Now we do a little grungy work by mmaping the ELF image into | |
988 | * the correct location in memory. At this point, we assume that | |
989 | * the image should be loaded at fixed address, not at a variable | |
990 | * address. | |
991 | */ | |
992 | ||
b4bebeee | 993 | for (i = 0, elf_ppnt = elf_phdata; i < elf_ex.e_phnum; i++, elf_ppnt++) { |
84778508 BS |
994 | int elf_prot = 0; |
995 | int elf_flags = 0; | |
996 | abi_ulong error; | |
997 | ||
998 | if (elf_ppnt->p_type != PT_LOAD) | |
999 | continue; | |
1000 | ||
1001 | if (elf_ppnt->p_flags & PF_R) elf_prot |= PROT_READ; | |
1002 | if (elf_ppnt->p_flags & PF_W) elf_prot |= PROT_WRITE; | |
1003 | if (elf_ppnt->p_flags & PF_X) elf_prot |= PROT_EXEC; | |
1004 | elf_flags = MAP_PRIVATE | MAP_DENYWRITE; | |
1005 | if (elf_ex.e_type == ET_EXEC || load_addr_set) { | |
1006 | elf_flags |= MAP_FIXED; | |
1007 | } else if (elf_ex.e_type == ET_DYN) { | |
1008 | /* Try and get dynamic programs out of the way of the default mmap | |
1009 | base, as well as whatever program they might try to exec. This | |
1010 | is because the brk will follow the loader, and is not movable. */ | |
1011 | /* NOTE: for qemu, we do a big mmap to get enough space | |
1012 | without hardcoding any address */ | |
1013 | error = target_mmap(0, ET_DYN_MAP_SIZE, | |
1014 | PROT_NONE, MAP_PRIVATE | MAP_ANON, | |
1015 | -1, 0); | |
1016 | if (error == -1) { | |
1017 | perror("mmap"); | |
1018 | exit(-1); | |
1019 | } | |
1020 | load_bias = TARGET_ELF_PAGESTART(error - elf_ppnt->p_vaddr); | |
1021 | } | |
1022 | ||
1023 | error = target_mmap(TARGET_ELF_PAGESTART(load_bias + elf_ppnt->p_vaddr), | |
1024 | (elf_ppnt->p_filesz + | |
1025 | TARGET_ELF_PAGEOFFSET(elf_ppnt->p_vaddr)), | |
1026 | elf_prot, | |
1027 | (MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE), | |
1028 | bprm->fd, | |
1029 | (elf_ppnt->p_offset - | |
1030 | TARGET_ELF_PAGEOFFSET(elf_ppnt->p_vaddr))); | |
1031 | if (error == -1) { | |
1032 | perror("mmap"); | |
1033 | exit(-1); | |
1034 | } | |
1035 | ||
1036 | #ifdef LOW_ELF_STACK | |
1037 | if (TARGET_ELF_PAGESTART(elf_ppnt->p_vaddr) < elf_stack) | |
1038 | elf_stack = TARGET_ELF_PAGESTART(elf_ppnt->p_vaddr); | |
1039 | #endif | |
1040 | ||
1041 | if (!load_addr_set) { | |
1042 | load_addr_set = 1; | |
1043 | load_addr = elf_ppnt->p_vaddr - elf_ppnt->p_offset; | |
1044 | if (elf_ex.e_type == ET_DYN) { | |
1045 | load_bias += error - | |
1046 | TARGET_ELF_PAGESTART(load_bias + elf_ppnt->p_vaddr); | |
1047 | load_addr += load_bias; | |
1048 | reloc_func_desc = load_bias; | |
1049 | } | |
1050 | } | |
1051 | k = elf_ppnt->p_vaddr; | |
1052 | if (k < start_code) | |
1053 | start_code = k; | |
1054 | if (start_data < k) | |
1055 | start_data = k; | |
1056 | k = elf_ppnt->p_vaddr + elf_ppnt->p_filesz; | |
1057 | if (k > elf_bss) | |
1058 | elf_bss = k; | |
1059 | if ((elf_ppnt->p_flags & PF_X) && end_code < k) | |
1060 | end_code = k; | |
1061 | if (end_data < k) | |
1062 | end_data = k; | |
1063 | k = elf_ppnt->p_vaddr + elf_ppnt->p_memsz; | |
1064 | if (k > elf_brk) elf_brk = k; | |
1065 | } | |
1066 | ||
1067 | elf_entry += load_bias; | |
1068 | elf_bss += load_bias; | |
1069 | elf_brk += load_bias; | |
1070 | start_code += load_bias; | |
1071 | end_code += load_bias; | |
1072 | start_data += load_bias; | |
1073 | end_data += load_bias; | |
1074 | ||
1075 | if (elf_interpreter) { | |
1076 | if (interpreter_type & 1) { | |
1077 | elf_entry = load_aout_interp(&interp_ex, interpreter_fd); | |
1078 | } | |
1079 | else if (interpreter_type & 2) { | |
1080 | elf_entry = load_elf_interp(&interp_elf_ex, interpreter_fd, | |
1081 | &interp_load_addr); | |
1082 | } | |
1083 | reloc_func_desc = interp_load_addr; | |
1084 | ||
1085 | close(interpreter_fd); | |
1086 | free(elf_interpreter); | |
1087 | ||
1088 | if (elf_entry == ~((abi_ulong)0UL)) { | |
1089 | printf("Unable to load interpreter\n"); | |
1090 | free(elf_phdata); | |
1091 | exit(-1); | |
1092 | return 0; | |
1093 | } | |
1094 | } | |
1095 | ||
1096 | free(elf_phdata); | |
1097 | ||
93fcfe39 | 1098 | if (qemu_log_enabled()) |
84778508 BS |
1099 | load_symbols(&elf_ex, bprm->fd); |
1100 | ||
1101 | if (interpreter_type != INTERPRETER_AOUT) close(bprm->fd); | |
1102 | info->personality = (ibcs2_interpreter ? PER_SVR4 : PER_LINUX); | |
1103 | ||
1104 | #ifdef LOW_ELF_STACK | |
1105 | info->start_stack = bprm->p = elf_stack - 4; | |
1106 | #endif | |
1107 | bprm->p = create_elf_tables(bprm->p, | |
1108 | bprm->argc, | |
1109 | bprm->envc, | |
1110 | &elf_ex, | |
1111 | load_addr, load_bias, | |
1112 | interp_load_addr, | |
1113 | (interpreter_type == INTERPRETER_AOUT ? 0 : 1), | |
1114 | info); | |
1115 | info->load_addr = reloc_func_desc; | |
1116 | info->start_brk = info->brk = elf_brk; | |
1117 | info->end_code = end_code; | |
1118 | info->start_code = start_code; | |
1119 | info->start_data = start_data; | |
1120 | info->end_data = end_data; | |
1121 | info->start_stack = bprm->p; | |
1122 | ||
1123 | /* Calling set_brk effectively mmaps the pages that we need for the bss and break | |
1124 | sections */ | |
1125 | set_brk(elf_bss, elf_brk); | |
1126 | ||
1127 | padzero(elf_bss, elf_brk); | |
1128 | ||
1129 | #if 0 | |
1130 | printf("(start_brk) %x\n" , info->start_brk); | |
1131 | printf("(end_code) %x\n" , info->end_code); | |
1132 | printf("(start_code) %x\n" , info->start_code); | |
1133 | printf("(end_data) %x\n" , info->end_data); | |
1134 | printf("(start_stack) %x\n" , info->start_stack); | |
1135 | printf("(brk) %x\n" , info->brk); | |
1136 | #endif | |
1137 | ||
b4bebeee | 1138 | if (info->personality == PER_SVR4) |
84778508 BS |
1139 | { |
1140 | /* Why this, you ask??? Well SVr4 maps page 0 as read-only, | |
1141 | and some applications "depend" upon this behavior. | |
1142 | Since we do not have the power to recompile these, we | |
1143 | emulate the SVr4 behavior. Sigh. */ | |
71025956 | 1144 | target_mmap(0, qemu_host_page_size, PROT_READ | PROT_EXEC, |
84778508 BS |
1145 | MAP_FIXED | MAP_PRIVATE, -1, 0); |
1146 | } | |
1147 | ||
1148 | info->entry = elf_entry; | |
1149 | ||
1150 | return 0; | |
1151 | } | |
1152 | ||
b4bebeee | 1153 | static int load_aout_interp(void *exptr, int interp_fd) |
84778508 BS |
1154 | { |
1155 | printf("a.out interpreter not yet supported\n"); | |
1156 | return(0); | |
1157 | } | |
1158 | ||
1159 | void do_init_thread(struct target_pt_regs *regs, struct image_info *infop) | |
1160 | { | |
1161 | init_thread(regs, infop); | |
1162 | } |