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84778508 BS |
1 | /* This is the Linux kernel elf-loading code, ported into user space */ |
2 | ||
3 | #include <stdio.h> | |
4 | #include <sys/types.h> | |
5 | #include <fcntl.h> | |
6 | #include <errno.h> | |
7 | #include <unistd.h> | |
8 | #include <sys/mman.h> | |
9 | #include <stdlib.h> | |
10 | #include <string.h> | |
11 | ||
12 | #include "qemu.h" | |
13 | #include "disas.h" | |
14 | ||
e58ffeb3 | 15 | #ifdef _ARCH_PPC64 |
84778508 BS |
16 | #undef ARCH_DLINFO |
17 | #undef ELF_PLATFORM | |
18 | #undef ELF_HWCAP | |
19 | #undef ELF_CLASS | |
20 | #undef ELF_DATA | |
21 | #undef ELF_ARCH | |
22 | #endif | |
23 | ||
24 | /* from personality.h */ | |
25 | ||
26 | /* | |
27 | * Flags for bug emulation. | |
28 | * | |
29 | * These occupy the top three bytes. | |
30 | */ | |
31 | enum { | |
32 | ADDR_NO_RANDOMIZE = 0x0040000, /* disable randomization of VA space */ | |
33 | FDPIC_FUNCPTRS = 0x0080000, /* userspace function ptrs point to descriptors | |
34 | * (signal handling) | |
35 | */ | |
36 | MMAP_PAGE_ZERO = 0x0100000, | |
37 | ADDR_COMPAT_LAYOUT = 0x0200000, | |
38 | READ_IMPLIES_EXEC = 0x0400000, | |
39 | ADDR_LIMIT_32BIT = 0x0800000, | |
40 | SHORT_INODE = 0x1000000, | |
41 | WHOLE_SECONDS = 0x2000000, | |
42 | STICKY_TIMEOUTS = 0x4000000, | |
43 | ADDR_LIMIT_3GB = 0x8000000, | |
44 | }; | |
45 | ||
46 | /* | |
47 | * Personality types. | |
48 | * | |
49 | * These go in the low byte. Avoid using the top bit, it will | |
50 | * conflict with error returns. | |
51 | */ | |
52 | enum { | |
53 | PER_LINUX = 0x0000, | |
54 | PER_LINUX_32BIT = 0x0000 | ADDR_LIMIT_32BIT, | |
55 | PER_LINUX_FDPIC = 0x0000 | FDPIC_FUNCPTRS, | |
56 | PER_SVR4 = 0x0001 | STICKY_TIMEOUTS | MMAP_PAGE_ZERO, | |
57 | PER_SVR3 = 0x0002 | STICKY_TIMEOUTS | SHORT_INODE, | |
58 | PER_SCOSVR3 = 0x0003 | STICKY_TIMEOUTS | | |
59 | WHOLE_SECONDS | SHORT_INODE, | |
60 | PER_OSR5 = 0x0003 | STICKY_TIMEOUTS | WHOLE_SECONDS, | |
61 | PER_WYSEV386 = 0x0004 | STICKY_TIMEOUTS | SHORT_INODE, | |
62 | PER_ISCR4 = 0x0005 | STICKY_TIMEOUTS, | |
63 | PER_BSD = 0x0006, | |
64 | PER_SUNOS = 0x0006 | STICKY_TIMEOUTS, | |
65 | PER_XENIX = 0x0007 | STICKY_TIMEOUTS | SHORT_INODE, | |
66 | PER_LINUX32 = 0x0008, | |
67 | PER_LINUX32_3GB = 0x0008 | ADDR_LIMIT_3GB, | |
68 | PER_IRIX32 = 0x0009 | STICKY_TIMEOUTS,/* IRIX5 32-bit */ | |
69 | PER_IRIXN32 = 0x000a | STICKY_TIMEOUTS,/* IRIX6 new 32-bit */ | |
70 | PER_IRIX64 = 0x000b | STICKY_TIMEOUTS,/* IRIX6 64-bit */ | |
71 | PER_RISCOS = 0x000c, | |
72 | PER_SOLARIS = 0x000d | STICKY_TIMEOUTS, | |
73 | PER_UW7 = 0x000e | STICKY_TIMEOUTS | MMAP_PAGE_ZERO, | |
74 | PER_OSF4 = 0x000f, /* OSF/1 v4 */ | |
75 | PER_HPUX = 0x0010, | |
76 | PER_MASK = 0x00ff, | |
77 | }; | |
78 | ||
79 | /* | |
80 | * Return the base personality without flags. | |
81 | */ | |
82 | #define personality(pers) (pers & PER_MASK) | |
83 | ||
84 | /* this flag is uneffective under linux too, should be deleted */ | |
85 | #ifndef MAP_DENYWRITE | |
86 | #define MAP_DENYWRITE 0 | |
87 | #endif | |
88 | ||
89 | /* should probably go in elf.h */ | |
90 | #ifndef ELIBBAD | |
91 | #define ELIBBAD 80 | |
92 | #endif | |
93 | ||
94 | #ifdef TARGET_I386 | |
95 | ||
96 | #define ELF_PLATFORM get_elf_platform() | |
97 | ||
98 | static const char *get_elf_platform(void) | |
99 | { | |
100 | static char elf_platform[] = "i386"; | |
101 | int family = (thread_env->cpuid_version >> 8) & 0xff; | |
102 | if (family > 6) | |
103 | family = 6; | |
104 | if (family >= 3) | |
105 | elf_platform[1] = '0' + family; | |
106 | return elf_platform; | |
107 | } | |
108 | ||
109 | #define ELF_HWCAP get_elf_hwcap() | |
110 | ||
111 | static uint32_t get_elf_hwcap(void) | |
112 | { | |
113 | return thread_env->cpuid_features; | |
114 | } | |
115 | ||
116 | #ifdef TARGET_X86_64 | |
117 | #define ELF_START_MMAP 0x2aaaaab000ULL | |
118 | #define elf_check_arch(x) ( ((x) == ELF_ARCH) ) | |
119 | ||
120 | #define ELF_CLASS ELFCLASS64 | |
121 | #define ELF_DATA ELFDATA2LSB | |
122 | #define ELF_ARCH EM_X86_64 | |
123 | ||
124 | static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop) | |
125 | { | |
126 | regs->rax = 0; | |
127 | regs->rsp = infop->start_stack; | |
128 | regs->rip = infop->entry; | |
78cfb07f JL |
129 | if (bsd_type == target_freebsd) { |
130 | regs->rdi = infop->start_stack; | |
131 | } | |
84778508 BS |
132 | } |
133 | ||
134 | #else | |
135 | ||
136 | #define ELF_START_MMAP 0x80000000 | |
137 | ||
138 | /* | |
139 | * This is used to ensure we don't load something for the wrong architecture. | |
140 | */ | |
141 | #define elf_check_arch(x) ( ((x) == EM_386) || ((x) == EM_486) ) | |
142 | ||
143 | /* | |
144 | * These are used to set parameters in the core dumps. | |
145 | */ | |
146 | #define ELF_CLASS ELFCLASS32 | |
147 | #define ELF_DATA ELFDATA2LSB | |
148 | #define ELF_ARCH EM_386 | |
149 | ||
150 | static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop) | |
151 | { | |
152 | regs->esp = infop->start_stack; | |
153 | regs->eip = infop->entry; | |
154 | ||
155 | /* SVR4/i386 ABI (pages 3-31, 3-32) says that when the program | |
156 | starts %edx contains a pointer to a function which might be | |
157 | registered using `atexit'. This provides a mean for the | |
158 | dynamic linker to call DT_FINI functions for shared libraries | |
159 | that have been loaded before the code runs. | |
160 | ||
161 | A value of 0 tells we have no such handler. */ | |
162 | regs->edx = 0; | |
163 | } | |
164 | #endif | |
165 | ||
166 | #define USE_ELF_CORE_DUMP | |
167 | #define ELF_EXEC_PAGESIZE 4096 | |
168 | ||
169 | #endif | |
170 | ||
171 | #ifdef TARGET_ARM | |
172 | ||
173 | #define ELF_START_MMAP 0x80000000 | |
174 | ||
175 | #define elf_check_arch(x) ( (x) == EM_ARM ) | |
176 | ||
177 | #define ELF_CLASS ELFCLASS32 | |
178 | #ifdef TARGET_WORDS_BIGENDIAN | |
179 | #define ELF_DATA ELFDATA2MSB | |
180 | #else | |
181 | #define ELF_DATA ELFDATA2LSB | |
182 | #endif | |
183 | #define ELF_ARCH EM_ARM | |
184 | ||
185 | static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop) | |
186 | { | |
187 | abi_long stack = infop->start_stack; | |
188 | memset(regs, 0, sizeof(*regs)); | |
189 | regs->ARM_cpsr = 0x10; | |
190 | if (infop->entry & 1) | |
191 | regs->ARM_cpsr |= CPSR_T; | |
192 | regs->ARM_pc = infop->entry & 0xfffffffe; | |
193 | regs->ARM_sp = infop->start_stack; | |
194 | /* FIXME - what to for failure of get_user()? */ | |
195 | get_user_ual(regs->ARM_r2, stack + 8); /* envp */ | |
196 | get_user_ual(regs->ARM_r1, stack + 4); /* envp */ | |
197 | /* XXX: it seems that r0 is zeroed after ! */ | |
198 | regs->ARM_r0 = 0; | |
199 | /* For uClinux PIC binaries. */ | |
200 | /* XXX: Linux does this only on ARM with no MMU (do we care ?) */ | |
201 | regs->ARM_r10 = infop->start_data; | |
202 | } | |
203 | ||
204 | #define USE_ELF_CORE_DUMP | |
205 | #define ELF_EXEC_PAGESIZE 4096 | |
206 | ||
207 | enum | |
208 | { | |
209 | ARM_HWCAP_ARM_SWP = 1 << 0, | |
210 | ARM_HWCAP_ARM_HALF = 1 << 1, | |
211 | ARM_HWCAP_ARM_THUMB = 1 << 2, | |
212 | ARM_HWCAP_ARM_26BIT = 1 << 3, | |
213 | ARM_HWCAP_ARM_FAST_MULT = 1 << 4, | |
214 | ARM_HWCAP_ARM_FPA = 1 << 5, | |
215 | ARM_HWCAP_ARM_VFP = 1 << 6, | |
216 | ARM_HWCAP_ARM_EDSP = 1 << 7, | |
217 | }; | |
218 | ||
219 | #define ELF_HWCAP (ARM_HWCAP_ARM_SWP | ARM_HWCAP_ARM_HALF \ | |
220 | | ARM_HWCAP_ARM_THUMB | ARM_HWCAP_ARM_FAST_MULT \ | |
221 | | ARM_HWCAP_ARM_FPA | ARM_HWCAP_ARM_VFP) | |
222 | ||
223 | #endif | |
224 | ||
225 | #ifdef TARGET_SPARC | |
226 | #ifdef TARGET_SPARC64 | |
227 | ||
228 | #define ELF_START_MMAP 0x80000000 | |
229 | ||
230 | #ifndef TARGET_ABI32 | |
231 | #define elf_check_arch(x) ( (x) == EM_SPARCV9 || (x) == EM_SPARC32PLUS ) | |
232 | #else | |
233 | #define elf_check_arch(x) ( (x) == EM_SPARC32PLUS || (x) == EM_SPARC ) | |
234 | #endif | |
235 | ||
236 | #define ELF_CLASS ELFCLASS64 | |
237 | #define ELF_DATA ELFDATA2MSB | |
238 | #define ELF_ARCH EM_SPARCV9 | |
239 | ||
240 | #define STACK_BIAS 2047 | |
241 | ||
242 | static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop) | |
243 | { | |
244 | #ifndef TARGET_ABI32 | |
245 | regs->tstate = 0; | |
246 | #endif | |
247 | regs->pc = infop->entry; | |
248 | regs->npc = regs->pc + 4; | |
249 | regs->y = 0; | |
250 | #ifdef TARGET_ABI32 | |
251 | regs->u_regs[14] = infop->start_stack - 16 * 4; | |
252 | #else | |
253 | if (personality(infop->personality) == PER_LINUX32) | |
254 | regs->u_regs[14] = infop->start_stack - 16 * 4; | |
78cfb07f | 255 | else { |
84778508 | 256 | regs->u_regs[14] = infop->start_stack - 16 * 8 - STACK_BIAS; |
78cfb07f JL |
257 | if (bsd_type == target_freebsd) { |
258 | regs->u_regs[8] = infop->start_stack; | |
259 | regs->u_regs[11] = infop->start_stack; | |
260 | } | |
261 | } | |
84778508 BS |
262 | #endif |
263 | } | |
264 | ||
265 | #else | |
266 | #define ELF_START_MMAP 0x80000000 | |
267 | ||
268 | #define elf_check_arch(x) ( (x) == EM_SPARC ) | |
269 | ||
270 | #define ELF_CLASS ELFCLASS32 | |
271 | #define ELF_DATA ELFDATA2MSB | |
272 | #define ELF_ARCH EM_SPARC | |
273 | ||
274 | static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop) | |
275 | { | |
276 | regs->psr = 0; | |
277 | regs->pc = infop->entry; | |
278 | regs->npc = regs->pc + 4; | |
279 | regs->y = 0; | |
280 | regs->u_regs[14] = infop->start_stack - 16 * 4; | |
281 | } | |
282 | ||
283 | #endif | |
284 | #endif | |
285 | ||
286 | #ifdef TARGET_PPC | |
287 | ||
288 | #define ELF_START_MMAP 0x80000000 | |
289 | ||
290 | #if defined(TARGET_PPC64) && !defined(TARGET_ABI32) | |
291 | ||
292 | #define elf_check_arch(x) ( (x) == EM_PPC64 ) | |
293 | ||
294 | #define ELF_CLASS ELFCLASS64 | |
295 | ||
296 | #else | |
297 | ||
298 | #define elf_check_arch(x) ( (x) == EM_PPC ) | |
299 | ||
300 | #define ELF_CLASS ELFCLASS32 | |
301 | ||
302 | #endif | |
303 | ||
304 | #ifdef TARGET_WORDS_BIGENDIAN | |
305 | #define ELF_DATA ELFDATA2MSB | |
306 | #else | |
307 | #define ELF_DATA ELFDATA2LSB | |
308 | #endif | |
309 | #define ELF_ARCH EM_PPC | |
310 | ||
311 | /* | |
312 | * We need to put in some extra aux table entries to tell glibc what | |
313 | * the cache block size is, so it can use the dcbz instruction safely. | |
314 | */ | |
315 | #define AT_DCACHEBSIZE 19 | |
316 | #define AT_ICACHEBSIZE 20 | |
317 | #define AT_UCACHEBSIZE 21 | |
318 | /* A special ignored type value for PPC, for glibc compatibility. */ | |
319 | #define AT_IGNOREPPC 22 | |
320 | /* | |
321 | * The requirements here are: | |
322 | * - keep the final alignment of sp (sp & 0xf) | |
323 | * - make sure the 32-bit value at the first 16 byte aligned position of | |
324 | * AUXV is greater than 16 for glibc compatibility. | |
325 | * AT_IGNOREPPC is used for that. | |
326 | * - for compatibility with glibc ARCH_DLINFO must always be defined on PPC, | |
327 | * even if DLINFO_ARCH_ITEMS goes to zero or is undefined. | |
328 | */ | |
329 | #define DLINFO_ARCH_ITEMS 5 | |
330 | #define ARCH_DLINFO \ | |
331 | do { \ | |
332 | NEW_AUX_ENT(AT_DCACHEBSIZE, 0x20); \ | |
333 | NEW_AUX_ENT(AT_ICACHEBSIZE, 0x20); \ | |
334 | NEW_AUX_ENT(AT_UCACHEBSIZE, 0); \ | |
335 | /* \ | |
336 | * Now handle glibc compatibility. \ | |
337 | */ \ | |
338 | NEW_AUX_ENT(AT_IGNOREPPC, AT_IGNOREPPC); \ | |
339 | NEW_AUX_ENT(AT_IGNOREPPC, AT_IGNOREPPC); \ | |
340 | } while (0) | |
341 | ||
342 | static inline void init_thread(struct target_pt_regs *_regs, struct image_info *infop) | |
343 | { | |
344 | abi_ulong pos = infop->start_stack; | |
345 | abi_ulong tmp; | |
346 | #if defined(TARGET_PPC64) && !defined(TARGET_ABI32) | |
347 | abi_ulong entry, toc; | |
348 | #endif | |
349 | ||
350 | _regs->gpr[1] = infop->start_stack; | |
351 | #if defined(TARGET_PPC64) && !defined(TARGET_ABI32) | |
352 | entry = ldq_raw(infop->entry) + infop->load_addr; | |
353 | toc = ldq_raw(infop->entry + 8) + infop->load_addr; | |
354 | _regs->gpr[2] = toc; | |
355 | infop->entry = entry; | |
356 | #endif | |
357 | _regs->nip = infop->entry; | |
358 | /* Note that isn't exactly what regular kernel does | |
359 | * but this is what the ABI wants and is needed to allow | |
360 | * execution of PPC BSD programs. | |
361 | */ | |
362 | /* FIXME - what to for failure of get_user()? */ | |
363 | get_user_ual(_regs->gpr[3], pos); | |
364 | pos += sizeof(abi_ulong); | |
365 | _regs->gpr[4] = pos; | |
366 | for (tmp = 1; tmp != 0; pos += sizeof(abi_ulong)) | |
367 | tmp = ldl(pos); | |
368 | _regs->gpr[5] = pos; | |
369 | } | |
370 | ||
371 | #define USE_ELF_CORE_DUMP | |
372 | #define ELF_EXEC_PAGESIZE 4096 | |
373 | ||
374 | #endif | |
375 | ||
376 | #ifdef TARGET_MIPS | |
377 | ||
378 | #define ELF_START_MMAP 0x80000000 | |
379 | ||
380 | #define elf_check_arch(x) ( (x) == EM_MIPS ) | |
381 | ||
382 | #ifdef TARGET_MIPS64 | |
383 | #define ELF_CLASS ELFCLASS64 | |
384 | #else | |
385 | #define ELF_CLASS ELFCLASS32 | |
386 | #endif | |
387 | #ifdef TARGET_WORDS_BIGENDIAN | |
388 | #define ELF_DATA ELFDATA2MSB | |
389 | #else | |
390 | #define ELF_DATA ELFDATA2LSB | |
391 | #endif | |
392 | #define ELF_ARCH EM_MIPS | |
393 | ||
394 | static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop) | |
395 | { | |
396 | regs->cp0_status = 2 << CP0St_KSU; | |
397 | regs->cp0_epc = infop->entry; | |
398 | regs->regs[29] = infop->start_stack; | |
399 | } | |
400 | ||
401 | #define USE_ELF_CORE_DUMP | |
402 | #define ELF_EXEC_PAGESIZE 4096 | |
403 | ||
404 | #endif /* TARGET_MIPS */ | |
405 | ||
406 | #ifdef TARGET_SH4 | |
407 | ||
408 | #define ELF_START_MMAP 0x80000000 | |
409 | ||
410 | #define elf_check_arch(x) ( (x) == EM_SH ) | |
411 | ||
412 | #define ELF_CLASS ELFCLASS32 | |
413 | #define ELF_DATA ELFDATA2LSB | |
414 | #define ELF_ARCH EM_SH | |
415 | ||
416 | static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop) | |
417 | { | |
418 | /* Check other registers XXXXX */ | |
419 | regs->pc = infop->entry; | |
420 | regs->regs[15] = infop->start_stack; | |
421 | } | |
422 | ||
423 | #define USE_ELF_CORE_DUMP | |
424 | #define ELF_EXEC_PAGESIZE 4096 | |
425 | ||
426 | #endif | |
427 | ||
428 | #ifdef TARGET_CRIS | |
429 | ||
430 | #define ELF_START_MMAP 0x80000000 | |
431 | ||
432 | #define elf_check_arch(x) ( (x) == EM_CRIS ) | |
433 | ||
434 | #define ELF_CLASS ELFCLASS32 | |
435 | #define ELF_DATA ELFDATA2LSB | |
436 | #define ELF_ARCH EM_CRIS | |
437 | ||
438 | static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop) | |
439 | { | |
440 | regs->erp = infop->entry; | |
441 | } | |
442 | ||
443 | #define USE_ELF_CORE_DUMP | |
444 | #define ELF_EXEC_PAGESIZE 8192 | |
445 | ||
446 | #endif | |
447 | ||
448 | #ifdef TARGET_M68K | |
449 | ||
450 | #define ELF_START_MMAP 0x80000000 | |
451 | ||
452 | #define elf_check_arch(x) ( (x) == EM_68K ) | |
453 | ||
454 | #define ELF_CLASS ELFCLASS32 | |
455 | #define ELF_DATA ELFDATA2MSB | |
456 | #define ELF_ARCH EM_68K | |
457 | ||
458 | /* ??? Does this need to do anything? | |
459 | #define ELF_PLAT_INIT(_r) */ | |
460 | ||
461 | static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop) | |
462 | { | |
463 | regs->usp = infop->start_stack; | |
464 | regs->sr = 0; | |
465 | regs->pc = infop->entry; | |
466 | } | |
467 | ||
468 | #define USE_ELF_CORE_DUMP | |
469 | #define ELF_EXEC_PAGESIZE 8192 | |
470 | ||
471 | #endif | |
472 | ||
473 | #ifdef TARGET_ALPHA | |
474 | ||
475 | #define ELF_START_MMAP (0x30000000000ULL) | |
476 | ||
477 | #define elf_check_arch(x) ( (x) == ELF_ARCH ) | |
478 | ||
479 | #define ELF_CLASS ELFCLASS64 | |
480 | #define ELF_DATA ELFDATA2MSB | |
481 | #define ELF_ARCH EM_ALPHA | |
482 | ||
483 | static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop) | |
484 | { | |
485 | regs->pc = infop->entry; | |
486 | regs->ps = 8; | |
487 | regs->usp = infop->start_stack; | |
488 | regs->unique = infop->start_data; /* ? */ | |
489 | printf("Set unique value to " TARGET_FMT_lx " (" TARGET_FMT_lx ")\n", | |
490 | regs->unique, infop->start_data); | |
491 | } | |
492 | ||
493 | #define USE_ELF_CORE_DUMP | |
494 | #define ELF_EXEC_PAGESIZE 8192 | |
495 | ||
496 | #endif /* TARGET_ALPHA */ | |
497 | ||
498 | #ifndef ELF_PLATFORM | |
499 | #define ELF_PLATFORM (NULL) | |
500 | #endif | |
501 | ||
502 | #ifndef ELF_HWCAP | |
503 | #define ELF_HWCAP 0 | |
504 | #endif | |
505 | ||
506 | #ifdef TARGET_ABI32 | |
507 | #undef ELF_CLASS | |
508 | #define ELF_CLASS ELFCLASS32 | |
509 | #undef bswaptls | |
510 | #define bswaptls(ptr) bswap32s(ptr) | |
511 | #endif | |
512 | ||
513 | #include "elf.h" | |
514 | ||
515 | struct exec | |
516 | { | |
517 | unsigned int a_info; /* Use macros N_MAGIC, etc for access */ | |
518 | unsigned int a_text; /* length of text, in bytes */ | |
519 | unsigned int a_data; /* length of data, in bytes */ | |
520 | unsigned int a_bss; /* length of uninitialized data area, in bytes */ | |
521 | unsigned int a_syms; /* length of symbol table data in file, in bytes */ | |
522 | unsigned int a_entry; /* start address */ | |
523 | unsigned int a_trsize; /* length of relocation info for text, in bytes */ | |
524 | unsigned int a_drsize; /* length of relocation info for data, in bytes */ | |
525 | }; | |
526 | ||
527 | ||
528 | #define N_MAGIC(exec) ((exec).a_info & 0xffff) | |
529 | #define OMAGIC 0407 | |
530 | #define NMAGIC 0410 | |
531 | #define ZMAGIC 0413 | |
532 | #define QMAGIC 0314 | |
533 | ||
534 | /* max code+data+bss space allocated to elf interpreter */ | |
535 | #define INTERP_MAP_SIZE (32 * 1024 * 1024) | |
536 | ||
537 | /* max code+data+bss+brk space allocated to ET_DYN executables */ | |
538 | #define ET_DYN_MAP_SIZE (128 * 1024 * 1024) | |
539 | ||
540 | /* Necessary parameters */ | |
541 | #define TARGET_ELF_EXEC_PAGESIZE TARGET_PAGE_SIZE | |
542 | #define TARGET_ELF_PAGESTART(_v) ((_v) & ~(unsigned long)(TARGET_ELF_EXEC_PAGESIZE-1)) | |
543 | #define TARGET_ELF_PAGEOFFSET(_v) ((_v) & (TARGET_ELF_EXEC_PAGESIZE-1)) | |
544 | ||
545 | #define INTERPRETER_NONE 0 | |
546 | #define INTERPRETER_AOUT 1 | |
547 | #define INTERPRETER_ELF 2 | |
548 | ||
549 | #define DLINFO_ITEMS 12 | |
550 | ||
551 | static inline void memcpy_fromfs(void * to, const void * from, unsigned long n) | |
552 | { | |
553 | memcpy(to, from, n); | |
554 | } | |
555 | ||
84778508 BS |
556 | static int load_aout_interp(void * exptr, int interp_fd); |
557 | ||
558 | #ifdef BSWAP_NEEDED | |
559 | static void bswap_ehdr(struct elfhdr *ehdr) | |
560 | { | |
561 | bswap16s(&ehdr->e_type); /* Object file type */ | |
562 | bswap16s(&ehdr->e_machine); /* Architecture */ | |
563 | bswap32s(&ehdr->e_version); /* Object file version */ | |
564 | bswaptls(&ehdr->e_entry); /* Entry point virtual address */ | |
565 | bswaptls(&ehdr->e_phoff); /* Program header table file offset */ | |
566 | bswaptls(&ehdr->e_shoff); /* Section header table file offset */ | |
567 | bswap32s(&ehdr->e_flags); /* Processor-specific flags */ | |
568 | bswap16s(&ehdr->e_ehsize); /* ELF header size in bytes */ | |
569 | bswap16s(&ehdr->e_phentsize); /* Program header table entry size */ | |
570 | bswap16s(&ehdr->e_phnum); /* Program header table entry count */ | |
571 | bswap16s(&ehdr->e_shentsize); /* Section header table entry size */ | |
572 | bswap16s(&ehdr->e_shnum); /* Section header table entry count */ | |
573 | bswap16s(&ehdr->e_shstrndx); /* Section header string table index */ | |
574 | } | |
575 | ||
576 | static void bswap_phdr(struct elf_phdr *phdr) | |
577 | { | |
578 | bswap32s(&phdr->p_type); /* Segment type */ | |
579 | bswaptls(&phdr->p_offset); /* Segment file offset */ | |
580 | bswaptls(&phdr->p_vaddr); /* Segment virtual address */ | |
581 | bswaptls(&phdr->p_paddr); /* Segment physical address */ | |
582 | bswaptls(&phdr->p_filesz); /* Segment size in file */ | |
583 | bswaptls(&phdr->p_memsz); /* Segment size in memory */ | |
584 | bswap32s(&phdr->p_flags); /* Segment flags */ | |
585 | bswaptls(&phdr->p_align); /* Segment alignment */ | |
586 | } | |
587 | ||
588 | static void bswap_shdr(struct elf_shdr *shdr) | |
589 | { | |
590 | bswap32s(&shdr->sh_name); | |
591 | bswap32s(&shdr->sh_type); | |
592 | bswaptls(&shdr->sh_flags); | |
593 | bswaptls(&shdr->sh_addr); | |
594 | bswaptls(&shdr->sh_offset); | |
595 | bswaptls(&shdr->sh_size); | |
596 | bswap32s(&shdr->sh_link); | |
597 | bswap32s(&shdr->sh_info); | |
598 | bswaptls(&shdr->sh_addralign); | |
599 | bswaptls(&shdr->sh_entsize); | |
600 | } | |
601 | ||
602 | static void bswap_sym(struct elf_sym *sym) | |
603 | { | |
604 | bswap32s(&sym->st_name); | |
605 | bswaptls(&sym->st_value); | |
606 | bswaptls(&sym->st_size); | |
607 | bswap16s(&sym->st_shndx); | |
608 | } | |
609 | #endif | |
610 | ||
611 | /* | |
612 | * 'copy_elf_strings()' copies argument/envelope strings from user | |
613 | * memory to free pages in kernel mem. These are in a format ready | |
614 | * to be put directly into the top of new user memory. | |
615 | * | |
616 | */ | |
617 | static abi_ulong copy_elf_strings(int argc,char ** argv, void **page, | |
618 | abi_ulong p) | |
619 | { | |
620 | char *tmp, *tmp1, *pag = NULL; | |
621 | int len, offset = 0; | |
622 | ||
623 | if (!p) { | |
624 | return 0; /* bullet-proofing */ | |
625 | } | |
626 | while (argc-- > 0) { | |
627 | tmp = argv[argc]; | |
628 | if (!tmp) { | |
629 | fprintf(stderr, "VFS: argc is wrong"); | |
630 | exit(-1); | |
631 | } | |
632 | tmp1 = tmp; | |
633 | while (*tmp++); | |
634 | len = tmp - tmp1; | |
635 | if (p < len) { /* this shouldn't happen - 128kB */ | |
636 | return 0; | |
637 | } | |
638 | while (len) { | |
639 | --p; --tmp; --len; | |
640 | if (--offset < 0) { | |
641 | offset = p % TARGET_PAGE_SIZE; | |
642 | pag = (char *)page[p/TARGET_PAGE_SIZE]; | |
643 | if (!pag) { | |
644 | pag = (char *)malloc(TARGET_PAGE_SIZE); | |
645 | memset(pag, 0, TARGET_PAGE_SIZE); | |
646 | page[p/TARGET_PAGE_SIZE] = pag; | |
647 | if (!pag) | |
648 | return 0; | |
649 | } | |
650 | } | |
651 | if (len == 0 || offset == 0) { | |
652 | *(pag + offset) = *tmp; | |
653 | } | |
654 | else { | |
655 | int bytes_to_copy = (len > offset) ? offset : len; | |
656 | tmp -= bytes_to_copy; | |
657 | p -= bytes_to_copy; | |
658 | offset -= bytes_to_copy; | |
659 | len -= bytes_to_copy; | |
660 | memcpy_fromfs(pag + offset, tmp, bytes_to_copy + 1); | |
661 | } | |
662 | } | |
663 | } | |
664 | return p; | |
665 | } | |
666 | ||
667 | static abi_ulong setup_arg_pages(abi_ulong p, struct linux_binprm *bprm, | |
668 | struct image_info *info) | |
669 | { | |
670 | abi_ulong stack_base, size, error; | |
671 | int i; | |
672 | ||
673 | /* Create enough stack to hold everything. If we don't use | |
674 | * it for args, we'll use it for something else... | |
675 | */ | |
676 | size = x86_stack_size; | |
677 | if (size < MAX_ARG_PAGES*TARGET_PAGE_SIZE) | |
678 | size = MAX_ARG_PAGES*TARGET_PAGE_SIZE; | |
679 | error = target_mmap(0, | |
680 | size + qemu_host_page_size, | |
681 | PROT_READ | PROT_WRITE, | |
682 | MAP_PRIVATE | MAP_ANON, | |
683 | -1, 0); | |
684 | if (error == -1) { | |
685 | perror("stk mmap"); | |
686 | exit(-1); | |
687 | } | |
688 | /* we reserve one extra page at the top of the stack as guard */ | |
689 | target_mprotect(error + size, qemu_host_page_size, PROT_NONE); | |
690 | ||
691 | stack_base = error + size - MAX_ARG_PAGES*TARGET_PAGE_SIZE; | |
692 | p += stack_base; | |
693 | ||
694 | for (i = 0 ; i < MAX_ARG_PAGES ; i++) { | |
695 | if (bprm->page[i]) { | |
696 | info->rss++; | |
697 | /* FIXME - check return value of memcpy_to_target() for failure */ | |
698 | memcpy_to_target(stack_base, bprm->page[i], TARGET_PAGE_SIZE); | |
699 | free(bprm->page[i]); | |
700 | } | |
701 | stack_base += TARGET_PAGE_SIZE; | |
702 | } | |
703 | return p; | |
704 | } | |
705 | ||
706 | static void set_brk(abi_ulong start, abi_ulong end) | |
707 | { | |
708 | /* page-align the start and end addresses... */ | |
709 | start = HOST_PAGE_ALIGN(start); | |
710 | end = HOST_PAGE_ALIGN(end); | |
711 | if (end <= start) | |
712 | return; | |
713 | if(target_mmap(start, end - start, | |
714 | PROT_READ | PROT_WRITE | PROT_EXEC, | |
715 | MAP_FIXED | MAP_PRIVATE | MAP_ANON, -1, 0) == -1) { | |
716 | perror("cannot mmap brk"); | |
717 | exit(-1); | |
718 | } | |
719 | } | |
720 | ||
721 | ||
722 | /* We need to explicitly zero any fractional pages after the data | |
723 | section (i.e. bss). This would contain the junk from the file that | |
724 | should not be in memory. */ | |
725 | static void padzero(abi_ulong elf_bss, abi_ulong last_bss) | |
726 | { | |
727 | abi_ulong nbyte; | |
728 | ||
729 | if (elf_bss >= last_bss) | |
730 | return; | |
731 | ||
732 | /* XXX: this is really a hack : if the real host page size is | |
733 | smaller than the target page size, some pages after the end | |
734 | of the file may not be mapped. A better fix would be to | |
735 | patch target_mmap(), but it is more complicated as the file | |
736 | size must be known */ | |
737 | if (qemu_real_host_page_size < qemu_host_page_size) { | |
738 | abi_ulong end_addr, end_addr1; | |
739 | end_addr1 = (elf_bss + qemu_real_host_page_size - 1) & | |
740 | ~(qemu_real_host_page_size - 1); | |
741 | end_addr = HOST_PAGE_ALIGN(elf_bss); | |
742 | if (end_addr1 < end_addr) { | |
743 | mmap((void *)g2h(end_addr1), end_addr - end_addr1, | |
744 | PROT_READ|PROT_WRITE|PROT_EXEC, | |
745 | MAP_FIXED|MAP_PRIVATE|MAP_ANON, -1, 0); | |
746 | } | |
747 | } | |
748 | ||
749 | nbyte = elf_bss & (qemu_host_page_size-1); | |
750 | if (nbyte) { | |
751 | nbyte = qemu_host_page_size - nbyte; | |
752 | do { | |
753 | /* FIXME - what to do if put_user() fails? */ | |
754 | put_user_u8(0, elf_bss); | |
755 | elf_bss++; | |
756 | } while (--nbyte); | |
757 | } | |
758 | } | |
759 | ||
760 | ||
761 | static abi_ulong create_elf_tables(abi_ulong p, int argc, int envc, | |
762 | struct elfhdr * exec, | |
763 | abi_ulong load_addr, | |
764 | abi_ulong load_bias, | |
765 | abi_ulong interp_load_addr, int ibcs, | |
766 | struct image_info *info) | |
767 | { | |
768 | abi_ulong sp; | |
769 | int size; | |
770 | abi_ulong u_platform; | |
771 | const char *k_platform; | |
772 | const int n = sizeof(elf_addr_t); | |
773 | ||
774 | sp = p; | |
775 | u_platform = 0; | |
776 | k_platform = ELF_PLATFORM; | |
777 | if (k_platform) { | |
778 | size_t len = strlen(k_platform) + 1; | |
779 | sp -= (len + n - 1) & ~(n - 1); | |
780 | u_platform = sp; | |
781 | /* FIXME - check return value of memcpy_to_target() for failure */ | |
782 | memcpy_to_target(sp, k_platform, len); | |
783 | } | |
784 | /* | |
785 | * Force 16 byte _final_ alignment here for generality. | |
786 | */ | |
787 | sp = sp &~ (abi_ulong)15; | |
788 | size = (DLINFO_ITEMS + 1) * 2; | |
789 | if (k_platform) | |
790 | size += 2; | |
791 | #ifdef DLINFO_ARCH_ITEMS | |
792 | size += DLINFO_ARCH_ITEMS * 2; | |
793 | #endif | |
794 | size += envc + argc + 2; | |
795 | size += (!ibcs ? 3 : 1); /* argc itself */ | |
796 | size *= n; | |
797 | if (size & 15) | |
798 | sp -= 16 - (size & 15); | |
799 | ||
800 | /* This is correct because Linux defines | |
801 | * elf_addr_t as Elf32_Off / Elf64_Off | |
802 | */ | |
803 | #define NEW_AUX_ENT(id, val) do { \ | |
804 | sp -= n; put_user_ual(val, sp); \ | |
805 | sp -= n; put_user_ual(id, sp); \ | |
806 | } while(0) | |
807 | ||
808 | NEW_AUX_ENT (AT_NULL, 0); | |
809 | ||
810 | /* There must be exactly DLINFO_ITEMS entries here. */ | |
811 | NEW_AUX_ENT(AT_PHDR, (abi_ulong)(load_addr + exec->e_phoff)); | |
812 | NEW_AUX_ENT(AT_PHENT, (abi_ulong)(sizeof (struct elf_phdr))); | |
813 | NEW_AUX_ENT(AT_PHNUM, (abi_ulong)(exec->e_phnum)); | |
814 | NEW_AUX_ENT(AT_PAGESZ, (abi_ulong)(TARGET_PAGE_SIZE)); | |
815 | NEW_AUX_ENT(AT_BASE, (abi_ulong)(interp_load_addr)); | |
816 | NEW_AUX_ENT(AT_FLAGS, (abi_ulong)0); | |
817 | NEW_AUX_ENT(AT_ENTRY, load_bias + exec->e_entry); | |
818 | NEW_AUX_ENT(AT_UID, (abi_ulong) getuid()); | |
819 | NEW_AUX_ENT(AT_EUID, (abi_ulong) geteuid()); | |
820 | NEW_AUX_ENT(AT_GID, (abi_ulong) getgid()); | |
821 | NEW_AUX_ENT(AT_EGID, (abi_ulong) getegid()); | |
822 | NEW_AUX_ENT(AT_HWCAP, (abi_ulong) ELF_HWCAP); | |
823 | NEW_AUX_ENT(AT_CLKTCK, (abi_ulong) sysconf(_SC_CLK_TCK)); | |
824 | if (k_platform) | |
825 | NEW_AUX_ENT(AT_PLATFORM, u_platform); | |
826 | #ifdef ARCH_DLINFO | |
827 | /* | |
828 | * ARCH_DLINFO must come last so platform specific code can enforce | |
829 | * special alignment requirements on the AUXV if necessary (eg. PPC). | |
830 | */ | |
831 | ARCH_DLINFO; | |
832 | #endif | |
833 | #undef NEW_AUX_ENT | |
834 | ||
835 | sp = loader_build_argptr(envc, argc, sp, p, !ibcs); | |
836 | return sp; | |
837 | } | |
838 | ||
839 | ||
840 | static abi_ulong load_elf_interp(struct elfhdr * interp_elf_ex, | |
841 | int interpreter_fd, | |
842 | abi_ulong *interp_load_addr) | |
843 | { | |
844 | struct elf_phdr *elf_phdata = NULL; | |
845 | struct elf_phdr *eppnt; | |
846 | abi_ulong load_addr = 0; | |
847 | int load_addr_set = 0; | |
848 | int retval; | |
849 | abi_ulong last_bss, elf_bss; | |
850 | abi_ulong error; | |
851 | int i; | |
852 | ||
853 | elf_bss = 0; | |
854 | last_bss = 0; | |
855 | error = 0; | |
856 | ||
857 | #ifdef BSWAP_NEEDED | |
858 | bswap_ehdr(interp_elf_ex); | |
859 | #endif | |
860 | /* First of all, some simple consistency checks */ | |
861 | if ((interp_elf_ex->e_type != ET_EXEC && | |
862 | interp_elf_ex->e_type != ET_DYN) || | |
863 | !elf_check_arch(interp_elf_ex->e_machine)) { | |
864 | return ~((abi_ulong)0UL); | |
865 | } | |
866 | ||
867 | ||
868 | /* Now read in all of the header information */ | |
869 | ||
870 | if (sizeof(struct elf_phdr) * interp_elf_ex->e_phnum > TARGET_PAGE_SIZE) | |
871 | return ~(abi_ulong)0UL; | |
872 | ||
873 | elf_phdata = (struct elf_phdr *) | |
874 | malloc(sizeof(struct elf_phdr) * interp_elf_ex->e_phnum); | |
875 | ||
876 | if (!elf_phdata) | |
877 | return ~((abi_ulong)0UL); | |
878 | ||
879 | /* | |
880 | * If the size of this structure has changed, then punt, since | |
881 | * we will be doing the wrong thing. | |
882 | */ | |
883 | if (interp_elf_ex->e_phentsize != sizeof(struct elf_phdr)) { | |
884 | free(elf_phdata); | |
885 | return ~((abi_ulong)0UL); | |
886 | } | |
887 | ||
888 | retval = lseek(interpreter_fd, interp_elf_ex->e_phoff, SEEK_SET); | |
889 | if(retval >= 0) { | |
890 | retval = read(interpreter_fd, | |
891 | (char *) elf_phdata, | |
892 | sizeof(struct elf_phdr) * interp_elf_ex->e_phnum); | |
893 | } | |
894 | if (retval < 0) { | |
895 | perror("load_elf_interp"); | |
896 | exit(-1); | |
897 | free (elf_phdata); | |
898 | return retval; | |
899 | } | |
900 | #ifdef BSWAP_NEEDED | |
901 | eppnt = elf_phdata; | |
902 | for (i=0; i<interp_elf_ex->e_phnum; i++, eppnt++) { | |
903 | bswap_phdr(eppnt); | |
904 | } | |
905 | #endif | |
906 | ||
907 | if (interp_elf_ex->e_type == ET_DYN) { | |
908 | /* in order to avoid hardcoding the interpreter load | |
909 | address in qemu, we allocate a big enough memory zone */ | |
910 | error = target_mmap(0, INTERP_MAP_SIZE, | |
911 | PROT_NONE, MAP_PRIVATE | MAP_ANON, | |
912 | -1, 0); | |
913 | if (error == -1) { | |
914 | perror("mmap"); | |
915 | exit(-1); | |
916 | } | |
917 | load_addr = error; | |
918 | load_addr_set = 1; | |
919 | } | |
920 | ||
921 | eppnt = elf_phdata; | |
922 | for(i=0; i<interp_elf_ex->e_phnum; i++, eppnt++) | |
923 | if (eppnt->p_type == PT_LOAD) { | |
924 | int elf_type = MAP_PRIVATE | MAP_DENYWRITE; | |
925 | int elf_prot = 0; | |
926 | abi_ulong vaddr = 0; | |
927 | abi_ulong k; | |
928 | ||
929 | if (eppnt->p_flags & PF_R) elf_prot = PROT_READ; | |
930 | if (eppnt->p_flags & PF_W) elf_prot |= PROT_WRITE; | |
931 | if (eppnt->p_flags & PF_X) elf_prot |= PROT_EXEC; | |
932 | if (interp_elf_ex->e_type == ET_EXEC || load_addr_set) { | |
933 | elf_type |= MAP_FIXED; | |
934 | vaddr = eppnt->p_vaddr; | |
935 | } | |
936 | error = target_mmap(load_addr+TARGET_ELF_PAGESTART(vaddr), | |
937 | eppnt->p_filesz + TARGET_ELF_PAGEOFFSET(eppnt->p_vaddr), | |
938 | elf_prot, | |
939 | elf_type, | |
940 | interpreter_fd, | |
941 | eppnt->p_offset - TARGET_ELF_PAGEOFFSET(eppnt->p_vaddr)); | |
942 | ||
943 | if (error == -1) { | |
944 | /* Real error */ | |
945 | close(interpreter_fd); | |
946 | free(elf_phdata); | |
947 | return ~((abi_ulong)0UL); | |
948 | } | |
949 | ||
950 | if (!load_addr_set && interp_elf_ex->e_type == ET_DYN) { | |
951 | load_addr = error; | |
952 | load_addr_set = 1; | |
953 | } | |
954 | ||
955 | /* | |
956 | * Find the end of the file mapping for this phdr, and keep | |
957 | * track of the largest address we see for this. | |
958 | */ | |
959 | k = load_addr + eppnt->p_vaddr + eppnt->p_filesz; | |
960 | if (k > elf_bss) elf_bss = k; | |
961 | ||
962 | /* | |
963 | * Do the same thing for the memory mapping - between | |
964 | * elf_bss and last_bss is the bss section. | |
965 | */ | |
966 | k = load_addr + eppnt->p_memsz + eppnt->p_vaddr; | |
967 | if (k > last_bss) last_bss = k; | |
968 | } | |
969 | ||
970 | /* Now use mmap to map the library into memory. */ | |
971 | ||
972 | close(interpreter_fd); | |
973 | ||
974 | /* | |
975 | * Now fill out the bss section. First pad the last page up | |
976 | * to the page boundary, and then perform a mmap to make sure | |
977 | * that there are zeromapped pages up to and including the last | |
978 | * bss page. | |
979 | */ | |
980 | padzero(elf_bss, last_bss); | |
981 | elf_bss = TARGET_ELF_PAGESTART(elf_bss + qemu_host_page_size - 1); /* What we have mapped so far */ | |
982 | ||
983 | /* Map the last of the bss segment */ | |
984 | if (last_bss > elf_bss) { | |
985 | target_mmap(elf_bss, last_bss-elf_bss, | |
986 | PROT_READ|PROT_WRITE|PROT_EXEC, | |
987 | MAP_FIXED|MAP_PRIVATE|MAP_ANON, -1, 0); | |
988 | } | |
989 | free(elf_phdata); | |
990 | ||
991 | *interp_load_addr = load_addr; | |
992 | return ((abi_ulong) interp_elf_ex->e_entry) + load_addr; | |
993 | } | |
994 | ||
995 | static int symfind(const void *s0, const void *s1) | |
996 | { | |
997 | struct elf_sym *key = (struct elf_sym *)s0; | |
998 | struct elf_sym *sym = (struct elf_sym *)s1; | |
999 | int result = 0; | |
1000 | if (key->st_value < sym->st_value) { | |
1001 | result = -1; | |
1002 | } else if (key->st_value > sym->st_value + sym->st_size) { | |
1003 | result = 1; | |
1004 | } | |
1005 | return result; | |
1006 | } | |
1007 | ||
1008 | static const char *lookup_symbolxx(struct syminfo *s, target_ulong orig_addr) | |
1009 | { | |
1010 | #if ELF_CLASS == ELFCLASS32 | |
1011 | struct elf_sym *syms = s->disas_symtab.elf32; | |
1012 | #else | |
1013 | struct elf_sym *syms = s->disas_symtab.elf64; | |
1014 | #endif | |
1015 | ||
1016 | // binary search | |
1017 | struct elf_sym key; | |
1018 | struct elf_sym *sym; | |
1019 | ||
1020 | key.st_value = orig_addr; | |
1021 | ||
1022 | sym = bsearch(&key, syms, s->disas_num_syms, sizeof(*syms), symfind); | |
7cba04f6 | 1023 | if (sym != NULL) { |
84778508 BS |
1024 | return s->disas_strtab + sym->st_name; |
1025 | } | |
1026 | ||
1027 | return ""; | |
1028 | } | |
1029 | ||
1030 | /* FIXME: This should use elf_ops.h */ | |
1031 | static int symcmp(const void *s0, const void *s1) | |
1032 | { | |
1033 | struct elf_sym *sym0 = (struct elf_sym *)s0; | |
1034 | struct elf_sym *sym1 = (struct elf_sym *)s1; | |
1035 | return (sym0->st_value < sym1->st_value) | |
1036 | ? -1 | |
1037 | : ((sym0->st_value > sym1->st_value) ? 1 : 0); | |
1038 | } | |
1039 | ||
1040 | /* Best attempt to load symbols from this ELF object. */ | |
1041 | static void load_symbols(struct elfhdr *hdr, int fd) | |
1042 | { | |
1043 | unsigned int i, nsyms; | |
1044 | struct elf_shdr sechdr, symtab, strtab; | |
1045 | char *strings; | |
1046 | struct syminfo *s; | |
29718712 | 1047 | struct elf_sym *syms, *new_syms; |
84778508 BS |
1048 | |
1049 | lseek(fd, hdr->e_shoff, SEEK_SET); | |
1050 | for (i = 0; i < hdr->e_shnum; i++) { | |
1051 | if (read(fd, &sechdr, sizeof(sechdr)) != sizeof(sechdr)) | |
1052 | return; | |
1053 | #ifdef BSWAP_NEEDED | |
1054 | bswap_shdr(&sechdr); | |
1055 | #endif | |
1056 | if (sechdr.sh_type == SHT_SYMTAB) { | |
1057 | symtab = sechdr; | |
1058 | lseek(fd, hdr->e_shoff | |
1059 | + sizeof(sechdr) * sechdr.sh_link, SEEK_SET); | |
1060 | if (read(fd, &strtab, sizeof(strtab)) | |
1061 | != sizeof(strtab)) | |
1062 | return; | |
1063 | #ifdef BSWAP_NEEDED | |
1064 | bswap_shdr(&strtab); | |
1065 | #endif | |
1066 | goto found; | |
1067 | } | |
1068 | } | |
1069 | return; /* Shouldn't happen... */ | |
1070 | ||
1071 | found: | |
1072 | /* Now know where the strtab and symtab are. Snarf them. */ | |
1073 | s = malloc(sizeof(*s)); | |
1074 | syms = malloc(symtab.sh_size); | |
29718712 SW |
1075 | if (!syms) { |
1076 | free(s); | |
84778508 | 1077 | return; |
29718712 | 1078 | } |
84778508 | 1079 | s->disas_strtab = strings = malloc(strtab.sh_size); |
29718712 SW |
1080 | if (!s->disas_strtab) { |
1081 | free(s); | |
1082 | free(syms); | |
84778508 | 1083 | return; |
29718712 | 1084 | } |
84778508 BS |
1085 | |
1086 | lseek(fd, symtab.sh_offset, SEEK_SET); | |
29718712 SW |
1087 | if (read(fd, syms, symtab.sh_size) != symtab.sh_size) { |
1088 | free(s); | |
1089 | free(syms); | |
1090 | free(strings); | |
84778508 | 1091 | return; |
29718712 | 1092 | } |
84778508 BS |
1093 | |
1094 | nsyms = symtab.sh_size / sizeof(struct elf_sym); | |
1095 | ||
1096 | i = 0; | |
1097 | while (i < nsyms) { | |
1098 | #ifdef BSWAP_NEEDED | |
1099 | bswap_sym(syms + i); | |
1100 | #endif | |
1101 | // Throw away entries which we do not need. | |
1102 | if (syms[i].st_shndx == SHN_UNDEF || | |
1103 | syms[i].st_shndx >= SHN_LORESERVE || | |
1104 | ELF_ST_TYPE(syms[i].st_info) != STT_FUNC) { | |
1105 | nsyms--; | |
1106 | if (i < nsyms) { | |
1107 | syms[i] = syms[nsyms]; | |
1108 | } | |
1109 | continue; | |
1110 | } | |
1111 | #if defined(TARGET_ARM) || defined (TARGET_MIPS) | |
1112 | /* The bottom address bit marks a Thumb or MIPS16 symbol. */ | |
1113 | syms[i].st_value &= ~(target_ulong)1; | |
1114 | #endif | |
1115 | i++; | |
1116 | } | |
29718712 SW |
1117 | |
1118 | /* Attempt to free the storage associated with the local symbols | |
1119 | that we threw away. Whether or not this has any effect on the | |
1120 | memory allocation depends on the malloc implementation and how | |
1121 | many symbols we managed to discard. */ | |
1122 | new_syms = realloc(syms, nsyms * sizeof(*syms)); | |
1123 | if (new_syms == NULL) { | |
1124 | free(s); | |
1125 | free(syms); | |
1126 | free(strings); | |
1127 | return; | |
1128 | } | |
1129 | syms = new_syms; | |
84778508 BS |
1130 | |
1131 | qsort(syms, nsyms, sizeof(*syms), symcmp); | |
1132 | ||
1133 | lseek(fd, strtab.sh_offset, SEEK_SET); | |
29718712 SW |
1134 | if (read(fd, strings, strtab.sh_size) != strtab.sh_size) { |
1135 | free(s); | |
1136 | free(syms); | |
1137 | free(strings); | |
84778508 | 1138 | return; |
29718712 | 1139 | } |
84778508 BS |
1140 | s->disas_num_syms = nsyms; |
1141 | #if ELF_CLASS == ELFCLASS32 | |
1142 | s->disas_symtab.elf32 = syms; | |
032e51d7 | 1143 | s->lookup_symbol = (lookup_symbol_t)lookup_symbolxx; |
84778508 BS |
1144 | #else |
1145 | s->disas_symtab.elf64 = syms; | |
032e51d7 | 1146 | s->lookup_symbol = (lookup_symbol_t)lookup_symbolxx; |
84778508 BS |
1147 | #endif |
1148 | s->next = syminfos; | |
1149 | syminfos = s; | |
1150 | } | |
1151 | ||
1152 | int load_elf_binary(struct linux_binprm * bprm, struct target_pt_regs * regs, | |
1153 | struct image_info * info) | |
1154 | { | |
1155 | struct elfhdr elf_ex; | |
1156 | struct elfhdr interp_elf_ex; | |
1157 | struct exec interp_ex; | |
1158 | int interpreter_fd = -1; /* avoid warning */ | |
1159 | abi_ulong load_addr, load_bias; | |
1160 | int load_addr_set = 0; | |
1161 | unsigned int interpreter_type = INTERPRETER_NONE; | |
1162 | unsigned char ibcs2_interpreter; | |
1163 | int i; | |
1164 | abi_ulong mapped_addr; | |
1165 | struct elf_phdr * elf_ppnt; | |
1166 | struct elf_phdr *elf_phdata; | |
1167 | abi_ulong elf_bss, k, elf_brk; | |
1168 | int retval; | |
1169 | char * elf_interpreter; | |
1170 | abi_ulong elf_entry, interp_load_addr = 0; | |
1171 | int status; | |
1172 | abi_ulong start_code, end_code, start_data, end_data; | |
1173 | abi_ulong reloc_func_desc = 0; | |
1174 | abi_ulong elf_stack; | |
1175 | char passed_fileno[6]; | |
1176 | ||
1177 | ibcs2_interpreter = 0; | |
1178 | status = 0; | |
1179 | load_addr = 0; | |
1180 | load_bias = 0; | |
1181 | elf_ex = *((struct elfhdr *) bprm->buf); /* exec-header */ | |
1182 | #ifdef BSWAP_NEEDED | |
1183 | bswap_ehdr(&elf_ex); | |
1184 | #endif | |
1185 | ||
1186 | /* First of all, some simple consistency checks */ | |
1187 | if ((elf_ex.e_type != ET_EXEC && elf_ex.e_type != ET_DYN) || | |
1188 | (! elf_check_arch(elf_ex.e_machine))) { | |
1189 | return -ENOEXEC; | |
1190 | } | |
1191 | ||
1192 | bprm->p = copy_elf_strings(1, &bprm->filename, bprm->page, bprm->p); | |
1193 | bprm->p = copy_elf_strings(bprm->envc,bprm->envp,bprm->page,bprm->p); | |
1194 | bprm->p = copy_elf_strings(bprm->argc,bprm->argv,bprm->page,bprm->p); | |
1195 | if (!bprm->p) { | |
1196 | retval = -E2BIG; | |
1197 | } | |
1198 | ||
1199 | /* Now read in all of the header information */ | |
1200 | elf_phdata = (struct elf_phdr *)malloc(elf_ex.e_phentsize*elf_ex.e_phnum); | |
1201 | if (elf_phdata == NULL) { | |
1202 | return -ENOMEM; | |
1203 | } | |
1204 | ||
1205 | retval = lseek(bprm->fd, elf_ex.e_phoff, SEEK_SET); | |
1206 | if(retval > 0) { | |
1207 | retval = read(bprm->fd, (char *) elf_phdata, | |
1208 | elf_ex.e_phentsize * elf_ex.e_phnum); | |
1209 | } | |
1210 | ||
1211 | if (retval < 0) { | |
1212 | perror("load_elf_binary"); | |
1213 | exit(-1); | |
1214 | free (elf_phdata); | |
1215 | return -errno; | |
1216 | } | |
1217 | ||
1218 | #ifdef BSWAP_NEEDED | |
1219 | elf_ppnt = elf_phdata; | |
1220 | for (i=0; i<elf_ex.e_phnum; i++, elf_ppnt++) { | |
1221 | bswap_phdr(elf_ppnt); | |
1222 | } | |
1223 | #endif | |
1224 | elf_ppnt = elf_phdata; | |
1225 | ||
1226 | elf_bss = 0; | |
1227 | elf_brk = 0; | |
1228 | ||
1229 | ||
1230 | elf_stack = ~((abi_ulong)0UL); | |
1231 | elf_interpreter = NULL; | |
1232 | start_code = ~((abi_ulong)0UL); | |
1233 | end_code = 0; | |
1234 | start_data = 0; | |
1235 | end_data = 0; | |
1236 | interp_ex.a_info = 0; | |
1237 | ||
1238 | for(i=0;i < elf_ex.e_phnum; i++) { | |
1239 | if (elf_ppnt->p_type == PT_INTERP) { | |
1240 | if ( elf_interpreter != NULL ) | |
1241 | { | |
1242 | free (elf_phdata); | |
1243 | free(elf_interpreter); | |
1244 | close(bprm->fd); | |
1245 | return -EINVAL; | |
1246 | } | |
1247 | ||
1248 | /* This is the program interpreter used for | |
1249 | * shared libraries - for now assume that this | |
1250 | * is an a.out format binary | |
1251 | */ | |
1252 | ||
1253 | elf_interpreter = (char *)malloc(elf_ppnt->p_filesz); | |
1254 | ||
1255 | if (elf_interpreter == NULL) { | |
1256 | free (elf_phdata); | |
1257 | close(bprm->fd); | |
1258 | return -ENOMEM; | |
1259 | } | |
1260 | ||
1261 | retval = lseek(bprm->fd, elf_ppnt->p_offset, SEEK_SET); | |
1262 | if(retval >= 0) { | |
1263 | retval = read(bprm->fd, elf_interpreter, elf_ppnt->p_filesz); | |
1264 | } | |
1265 | if(retval < 0) { | |
1266 | perror("load_elf_binary2"); | |
1267 | exit(-1); | |
1268 | } | |
1269 | ||
1270 | /* If the program interpreter is one of these two, | |
1271 | then assume an iBCS2 image. Otherwise assume | |
1272 | a native linux image. */ | |
1273 | ||
1274 | /* JRP - Need to add X86 lib dir stuff here... */ | |
1275 | ||
1276 | if (strcmp(elf_interpreter,"/usr/lib/libc.so.1") == 0 || | |
1277 | strcmp(elf_interpreter,"/usr/lib/ld.so.1") == 0) { | |
1278 | ibcs2_interpreter = 1; | |
1279 | } | |
1280 | ||
1281 | #if 0 | |
b7d43d03 | 1282 | printf("Using ELF interpreter %s\n", path(elf_interpreter)); |
84778508 BS |
1283 | #endif |
1284 | if (retval >= 0) { | |
1285 | retval = open(path(elf_interpreter), O_RDONLY); | |
1286 | if(retval >= 0) { | |
1287 | interpreter_fd = retval; | |
1288 | } | |
1289 | else { | |
1290 | perror(elf_interpreter); | |
1291 | exit(-1); | |
1292 | /* retval = -errno; */ | |
1293 | } | |
1294 | } | |
1295 | ||
1296 | if (retval >= 0) { | |
1297 | retval = lseek(interpreter_fd, 0, SEEK_SET); | |
1298 | if(retval >= 0) { | |
1299 | retval = read(interpreter_fd,bprm->buf,128); | |
1300 | } | |
1301 | } | |
1302 | if (retval >= 0) { | |
1303 | interp_ex = *((struct exec *) bprm->buf); /* aout exec-header */ | |
6ece4df6 | 1304 | interp_elf_ex = *((struct elfhdr *) bprm->buf); /* elf exec-header */ |
84778508 BS |
1305 | } |
1306 | if (retval < 0) { | |
1307 | perror("load_elf_binary3"); | |
1308 | exit(-1); | |
1309 | free (elf_phdata); | |
1310 | free(elf_interpreter); | |
1311 | close(bprm->fd); | |
1312 | return retval; | |
1313 | } | |
1314 | } | |
1315 | elf_ppnt++; | |
1316 | } | |
1317 | ||
1318 | /* Some simple consistency checks for the interpreter */ | |
1319 | if (elf_interpreter){ | |
1320 | interpreter_type = INTERPRETER_ELF | INTERPRETER_AOUT; | |
1321 | ||
1322 | /* Now figure out which format our binary is */ | |
1323 | if ((N_MAGIC(interp_ex) != OMAGIC) && (N_MAGIC(interp_ex) != ZMAGIC) && | |
1324 | (N_MAGIC(interp_ex) != QMAGIC)) { | |
1325 | interpreter_type = INTERPRETER_ELF; | |
1326 | } | |
1327 | ||
1328 | if (interp_elf_ex.e_ident[0] != 0x7f || | |
fff2a02f | 1329 | strncmp((char *)&interp_elf_ex.e_ident[1], "ELF",3) != 0) { |
84778508 BS |
1330 | interpreter_type &= ~INTERPRETER_ELF; |
1331 | } | |
1332 | ||
1333 | if (!interpreter_type) { | |
1334 | free(elf_interpreter); | |
1335 | free(elf_phdata); | |
1336 | close(bprm->fd); | |
1337 | return -ELIBBAD; | |
1338 | } | |
1339 | } | |
1340 | ||
1341 | /* OK, we are done with that, now set up the arg stuff, | |
1342 | and then start this sucker up */ | |
1343 | ||
1344 | { | |
1345 | char * passed_p; | |
1346 | ||
1347 | if (interpreter_type == INTERPRETER_AOUT) { | |
1348 | snprintf(passed_fileno, sizeof(passed_fileno), "%d", bprm->fd); | |
1349 | passed_p = passed_fileno; | |
1350 | ||
1351 | if (elf_interpreter) { | |
1352 | bprm->p = copy_elf_strings(1,&passed_p,bprm->page,bprm->p); | |
1353 | bprm->argc++; | |
1354 | } | |
1355 | } | |
1356 | if (!bprm->p) { | |
1357 | if (elf_interpreter) { | |
1358 | free(elf_interpreter); | |
1359 | } | |
1360 | free (elf_phdata); | |
1361 | close(bprm->fd); | |
1362 | return -E2BIG; | |
1363 | } | |
1364 | } | |
1365 | ||
1366 | /* OK, This is the point of no return */ | |
1367 | info->end_data = 0; | |
1368 | info->end_code = 0; | |
1369 | info->start_mmap = (abi_ulong)ELF_START_MMAP; | |
1370 | info->mmap = 0; | |
1371 | elf_entry = (abi_ulong) elf_ex.e_entry; | |
1372 | ||
2fa5d9ba BS |
1373 | #if defined(CONFIG_USE_GUEST_BASE) |
1374 | /* | |
1375 | * In case where user has not explicitly set the guest_base, we | |
1376 | * probe here that should we set it automatically. | |
1377 | */ | |
1378 | if (!have_guest_base) { | |
1379 | /* | |
1380 | * Go through ELF program header table and find out whether | |
1381 | * any of the segments drop below our current mmap_min_addr and | |
1382 | * in that case set guest_base to corresponding address. | |
1383 | */ | |
1384 | for (i = 0, elf_ppnt = elf_phdata; i < elf_ex.e_phnum; | |
1385 | i++, elf_ppnt++) { | |
1386 | if (elf_ppnt->p_type != PT_LOAD) | |
1387 | continue; | |
1388 | if (HOST_PAGE_ALIGN(elf_ppnt->p_vaddr) < mmap_min_addr) { | |
1389 | guest_base = HOST_PAGE_ALIGN(mmap_min_addr); | |
1390 | break; | |
1391 | } | |
1392 | } | |
1393 | } | |
1394 | #endif /* CONFIG_USE_GUEST_BASE */ | |
1395 | ||
84778508 BS |
1396 | /* Do this so that we can load the interpreter, if need be. We will |
1397 | change some of these later */ | |
1398 | info->rss = 0; | |
1399 | bprm->p = setup_arg_pages(bprm->p, bprm, info); | |
1400 | info->start_stack = bprm->p; | |
1401 | ||
1402 | /* Now we do a little grungy work by mmaping the ELF image into | |
1403 | * the correct location in memory. At this point, we assume that | |
1404 | * the image should be loaded at fixed address, not at a variable | |
1405 | * address. | |
1406 | */ | |
1407 | ||
1408 | for(i = 0, elf_ppnt = elf_phdata; i < elf_ex.e_phnum; i++, elf_ppnt++) { | |
1409 | int elf_prot = 0; | |
1410 | int elf_flags = 0; | |
1411 | abi_ulong error; | |
1412 | ||
1413 | if (elf_ppnt->p_type != PT_LOAD) | |
1414 | continue; | |
1415 | ||
1416 | if (elf_ppnt->p_flags & PF_R) elf_prot |= PROT_READ; | |
1417 | if (elf_ppnt->p_flags & PF_W) elf_prot |= PROT_WRITE; | |
1418 | if (elf_ppnt->p_flags & PF_X) elf_prot |= PROT_EXEC; | |
1419 | elf_flags = MAP_PRIVATE | MAP_DENYWRITE; | |
1420 | if (elf_ex.e_type == ET_EXEC || load_addr_set) { | |
1421 | elf_flags |= MAP_FIXED; | |
1422 | } else if (elf_ex.e_type == ET_DYN) { | |
1423 | /* Try and get dynamic programs out of the way of the default mmap | |
1424 | base, as well as whatever program they might try to exec. This | |
1425 | is because the brk will follow the loader, and is not movable. */ | |
1426 | /* NOTE: for qemu, we do a big mmap to get enough space | |
1427 | without hardcoding any address */ | |
1428 | error = target_mmap(0, ET_DYN_MAP_SIZE, | |
1429 | PROT_NONE, MAP_PRIVATE | MAP_ANON, | |
1430 | -1, 0); | |
1431 | if (error == -1) { | |
1432 | perror("mmap"); | |
1433 | exit(-1); | |
1434 | } | |
1435 | load_bias = TARGET_ELF_PAGESTART(error - elf_ppnt->p_vaddr); | |
1436 | } | |
1437 | ||
1438 | error = target_mmap(TARGET_ELF_PAGESTART(load_bias + elf_ppnt->p_vaddr), | |
1439 | (elf_ppnt->p_filesz + | |
1440 | TARGET_ELF_PAGEOFFSET(elf_ppnt->p_vaddr)), | |
1441 | elf_prot, | |
1442 | (MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE), | |
1443 | bprm->fd, | |
1444 | (elf_ppnt->p_offset - | |
1445 | TARGET_ELF_PAGEOFFSET(elf_ppnt->p_vaddr))); | |
1446 | if (error == -1) { | |
1447 | perror("mmap"); | |
1448 | exit(-1); | |
1449 | } | |
1450 | ||
1451 | #ifdef LOW_ELF_STACK | |
1452 | if (TARGET_ELF_PAGESTART(elf_ppnt->p_vaddr) < elf_stack) | |
1453 | elf_stack = TARGET_ELF_PAGESTART(elf_ppnt->p_vaddr); | |
1454 | #endif | |
1455 | ||
1456 | if (!load_addr_set) { | |
1457 | load_addr_set = 1; | |
1458 | load_addr = elf_ppnt->p_vaddr - elf_ppnt->p_offset; | |
1459 | if (elf_ex.e_type == ET_DYN) { | |
1460 | load_bias += error - | |
1461 | TARGET_ELF_PAGESTART(load_bias + elf_ppnt->p_vaddr); | |
1462 | load_addr += load_bias; | |
1463 | reloc_func_desc = load_bias; | |
1464 | } | |
1465 | } | |
1466 | k = elf_ppnt->p_vaddr; | |
1467 | if (k < start_code) | |
1468 | start_code = k; | |
1469 | if (start_data < k) | |
1470 | start_data = k; | |
1471 | k = elf_ppnt->p_vaddr + elf_ppnt->p_filesz; | |
1472 | if (k > elf_bss) | |
1473 | elf_bss = k; | |
1474 | if ((elf_ppnt->p_flags & PF_X) && end_code < k) | |
1475 | end_code = k; | |
1476 | if (end_data < k) | |
1477 | end_data = k; | |
1478 | k = elf_ppnt->p_vaddr + elf_ppnt->p_memsz; | |
1479 | if (k > elf_brk) elf_brk = k; | |
1480 | } | |
1481 | ||
1482 | elf_entry += load_bias; | |
1483 | elf_bss += load_bias; | |
1484 | elf_brk += load_bias; | |
1485 | start_code += load_bias; | |
1486 | end_code += load_bias; | |
1487 | start_data += load_bias; | |
1488 | end_data += load_bias; | |
1489 | ||
1490 | if (elf_interpreter) { | |
1491 | if (interpreter_type & 1) { | |
1492 | elf_entry = load_aout_interp(&interp_ex, interpreter_fd); | |
1493 | } | |
1494 | else if (interpreter_type & 2) { | |
1495 | elf_entry = load_elf_interp(&interp_elf_ex, interpreter_fd, | |
1496 | &interp_load_addr); | |
1497 | } | |
1498 | reloc_func_desc = interp_load_addr; | |
1499 | ||
1500 | close(interpreter_fd); | |
1501 | free(elf_interpreter); | |
1502 | ||
1503 | if (elf_entry == ~((abi_ulong)0UL)) { | |
1504 | printf("Unable to load interpreter\n"); | |
1505 | free(elf_phdata); | |
1506 | exit(-1); | |
1507 | return 0; | |
1508 | } | |
1509 | } | |
1510 | ||
1511 | free(elf_phdata); | |
1512 | ||
93fcfe39 | 1513 | if (qemu_log_enabled()) |
84778508 BS |
1514 | load_symbols(&elf_ex, bprm->fd); |
1515 | ||
1516 | if (interpreter_type != INTERPRETER_AOUT) close(bprm->fd); | |
1517 | info->personality = (ibcs2_interpreter ? PER_SVR4 : PER_LINUX); | |
1518 | ||
1519 | #ifdef LOW_ELF_STACK | |
1520 | info->start_stack = bprm->p = elf_stack - 4; | |
1521 | #endif | |
1522 | bprm->p = create_elf_tables(bprm->p, | |
1523 | bprm->argc, | |
1524 | bprm->envc, | |
1525 | &elf_ex, | |
1526 | load_addr, load_bias, | |
1527 | interp_load_addr, | |
1528 | (interpreter_type == INTERPRETER_AOUT ? 0 : 1), | |
1529 | info); | |
1530 | info->load_addr = reloc_func_desc; | |
1531 | info->start_brk = info->brk = elf_brk; | |
1532 | info->end_code = end_code; | |
1533 | info->start_code = start_code; | |
1534 | info->start_data = start_data; | |
1535 | info->end_data = end_data; | |
1536 | info->start_stack = bprm->p; | |
1537 | ||
1538 | /* Calling set_brk effectively mmaps the pages that we need for the bss and break | |
1539 | sections */ | |
1540 | set_brk(elf_bss, elf_brk); | |
1541 | ||
1542 | padzero(elf_bss, elf_brk); | |
1543 | ||
1544 | #if 0 | |
1545 | printf("(start_brk) %x\n" , info->start_brk); | |
1546 | printf("(end_code) %x\n" , info->end_code); | |
1547 | printf("(start_code) %x\n" , info->start_code); | |
1548 | printf("(end_data) %x\n" , info->end_data); | |
1549 | printf("(start_stack) %x\n" , info->start_stack); | |
1550 | printf("(brk) %x\n" , info->brk); | |
1551 | #endif | |
1552 | ||
1553 | if ( info->personality == PER_SVR4 ) | |
1554 | { | |
1555 | /* Why this, you ask??? Well SVr4 maps page 0 as read-only, | |
1556 | and some applications "depend" upon this behavior. | |
1557 | Since we do not have the power to recompile these, we | |
1558 | emulate the SVr4 behavior. Sigh. */ | |
1559 | mapped_addr = target_mmap(0, qemu_host_page_size, PROT_READ | PROT_EXEC, | |
1560 | MAP_FIXED | MAP_PRIVATE, -1, 0); | |
1561 | } | |
1562 | ||
1563 | info->entry = elf_entry; | |
1564 | ||
1565 | return 0; | |
1566 | } | |
1567 | ||
1568 | static int load_aout_interp(void * exptr, int interp_fd) | |
1569 | { | |
1570 | printf("a.out interpreter not yet supported\n"); | |
1571 | return(0); | |
1572 | } | |
1573 | ||
1574 | void do_init_thread(struct target_pt_regs *regs, struct image_info *infop) | |
1575 | { | |
1576 | init_thread(regs, infop); | |
1577 | } |