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1.1 root 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:
15: /* this flag is uneffective under linux too, should be deleted */
16: #ifndef MAP_DENYWRITE
17: #define MAP_DENYWRITE 0
18: #endif
19:
20: /* should probably go in elf.h */
21: #ifndef ELIBBAD
22: #define ELIBBAD 80
23: #endif
24:
25: #ifdef TARGET_I386
26:
1.1.1.2 root 27: #define ELF_PLATFORM get_elf_platform()
28:
29: static const char *get_elf_platform(void)
30: {
31: static char elf_platform[] = "i386";
32: int family = (global_env->cpuid_version >> 8) & 0xff;
33: if (family > 6)
34: family = 6;
35: if (family >= 3)
36: elf_platform[1] = '0' + family;
37: return elf_platform;
38: }
39:
40: #define ELF_HWCAP get_elf_hwcap()
41:
42: static uint32_t get_elf_hwcap(void)
43: {
44: return global_env->cpuid_features;
45: }
46:
1.1 root 47: #define ELF_START_MMAP 0x80000000
48:
49: /*
50: * This is used to ensure we don't load something for the wrong architecture.
51: */
52: #define elf_check_arch(x) ( ((x) == EM_386) || ((x) == EM_486) )
53:
54: /*
55: * These are used to set parameters in the core dumps.
56: */
57: #define ELF_CLASS ELFCLASS32
58: #define ELF_DATA ELFDATA2LSB
59: #define ELF_ARCH EM_386
60:
61: static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop)
62: {
63: regs->esp = infop->start_stack;
64: regs->eip = infop->entry;
1.1.1.4 ! root 65:
! 66: /* SVR4/i386 ABI (pages 3-31, 3-32) says that when the program
! 67: starts %edx contains a pointer to a function which might be
! 68: registered using `atexit'. This provides a mean for the
! 69: dynamic linker to call DT_FINI functions for shared libraries
! 70: that have been loaded before the code runs.
! 71:
! 72: A value of 0 tells we have no such handler. */
! 73: regs->edx = 0;
1.1 root 74: }
75:
76: #define USE_ELF_CORE_DUMP
77: #define ELF_EXEC_PAGESIZE 4096
78:
79: #endif
80:
81: #ifdef TARGET_ARM
82:
83: #define ELF_START_MMAP 0x80000000
84:
85: #define elf_check_arch(x) ( (x) == EM_ARM )
86:
87: #define ELF_CLASS ELFCLASS32
88: #ifdef TARGET_WORDS_BIGENDIAN
89: #define ELF_DATA ELFDATA2MSB
90: #else
91: #define ELF_DATA ELFDATA2LSB
92: #endif
93: #define ELF_ARCH EM_ARM
94:
95: static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop)
96: {
1.1.1.3 root 97: target_long stack = infop->start_stack;
1.1 root 98: memset(regs, 0, sizeof(*regs));
99: regs->ARM_cpsr = 0x10;
1.1.1.3 root 100: if (infop->entry & 1)
101: regs->ARM_cpsr |= CPSR_T;
102: regs->ARM_pc = infop->entry & 0xfffffffe;
1.1 root 103: regs->ARM_sp = infop->start_stack;
1.1.1.3 root 104: regs->ARM_r2 = tgetl(stack + 8); /* envp */
105: regs->ARM_r1 = tgetl(stack + 4); /* envp */
1.1 root 106: /* XXX: it seems that r0 is zeroed after ! */
1.1.1.4 ! root 107: regs->ARM_r0 = 0;
! 108: /* For uClinux PIC binaries. */
! 109: regs->ARM_r10 = infop->start_data;
1.1 root 110: }
111:
112: #define USE_ELF_CORE_DUMP
113: #define ELF_EXEC_PAGESIZE 4096
114:
1.1.1.2 root 115: enum
116: {
117: ARM_HWCAP_ARM_SWP = 1 << 0,
118: ARM_HWCAP_ARM_HALF = 1 << 1,
119: ARM_HWCAP_ARM_THUMB = 1 << 2,
120: ARM_HWCAP_ARM_26BIT = 1 << 3,
121: ARM_HWCAP_ARM_FAST_MULT = 1 << 4,
122: ARM_HWCAP_ARM_FPA = 1 << 5,
123: ARM_HWCAP_ARM_VFP = 1 << 6,
124: ARM_HWCAP_ARM_EDSP = 1 << 7,
125: };
126:
127: #define ELF_HWCAP (ARM_HWCAP_ARM_SWP | ARM_HWCAP_ARM_HALF \
128: | ARM_HWCAP_ARM_THUMB | ARM_HWCAP_ARM_FAST_MULT \
129: | ARM_HWCAP_ARM_FPA | ARM_HWCAP_ARM_VFP)
130:
1.1 root 131: #endif
132:
133: #ifdef TARGET_SPARC
134: #ifdef TARGET_SPARC64
135:
136: #define ELF_START_MMAP 0x80000000
137:
1.1.1.4 ! root 138: #define elf_check_arch(x) ( (x) == EM_SPARCV9 )
1.1 root 139:
140: #define ELF_CLASS ELFCLASS64
141: #define ELF_DATA ELFDATA2MSB
1.1.1.4 ! root 142: #define ELF_ARCH EM_SPARCV9
1.1 root 143:
1.1.1.4 ! root 144: #define STACK_BIAS 2047
1.1 root 145:
146: static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop)
147: {
148: regs->tstate = 0;
149: regs->pc = infop->entry;
150: regs->npc = regs->pc + 4;
151: regs->y = 0;
1.1.1.4 ! root 152: regs->u_regs[14] = infop->start_stack - 16 * 8 - STACK_BIAS;
1.1 root 153: }
154:
155: #else
156: #define ELF_START_MMAP 0x80000000
157:
158: #define elf_check_arch(x) ( (x) == EM_SPARC )
159:
160: #define ELF_CLASS ELFCLASS32
161: #define ELF_DATA ELFDATA2MSB
162: #define ELF_ARCH EM_SPARC
163:
164: static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop)
165: {
166: regs->psr = 0;
167: regs->pc = infop->entry;
168: regs->npc = regs->pc + 4;
169: regs->y = 0;
170: regs->u_regs[14] = infop->start_stack - 16 * 4;
171: }
172:
173: #endif
174: #endif
175:
176: #ifdef TARGET_PPC
177:
178: #define ELF_START_MMAP 0x80000000
179:
180: #define elf_check_arch(x) ( (x) == EM_PPC )
181:
182: #define ELF_CLASS ELFCLASS32
183: #ifdef TARGET_WORDS_BIGENDIAN
184: #define ELF_DATA ELFDATA2MSB
185: #else
186: #define ELF_DATA ELFDATA2LSB
187: #endif
188: #define ELF_ARCH EM_PPC
189:
190: /*
191: * We need to put in some extra aux table entries to tell glibc what
192: * the cache block size is, so it can use the dcbz instruction safely.
193: */
194: #define AT_DCACHEBSIZE 19
195: #define AT_ICACHEBSIZE 20
196: #define AT_UCACHEBSIZE 21
197: /* A special ignored type value for PPC, for glibc compatibility. */
198: #define AT_IGNOREPPC 22
199: /*
200: * The requirements here are:
201: * - keep the final alignment of sp (sp & 0xf)
202: * - make sure the 32-bit value at the first 16 byte aligned position of
203: * AUXV is greater than 16 for glibc compatibility.
204: * AT_IGNOREPPC is used for that.
205: * - for compatibility with glibc ARCH_DLINFO must always be defined on PPC,
206: * even if DLINFO_ARCH_ITEMS goes to zero or is undefined.
207: */
208: #define DLINFO_ARCH_ITEMS 5
209: #define ARCH_DLINFO \
210: do { \
211: NEW_AUX_ENT(AT_DCACHEBSIZE, 0x20); \
212: NEW_AUX_ENT(AT_ICACHEBSIZE, 0x20); \
213: NEW_AUX_ENT(AT_UCACHEBSIZE, 0); \
214: /* \
215: * Now handle glibc compatibility. \
216: */ \
217: NEW_AUX_ENT(AT_IGNOREPPC, AT_IGNOREPPC); \
218: NEW_AUX_ENT(AT_IGNOREPPC, AT_IGNOREPPC); \
219: } while (0)
220:
221: static inline void init_thread(struct target_pt_regs *_regs, struct image_info *infop)
222: {
1.1.1.4 ! root 223: target_ulong pos = infop->start_stack;
! 224: target_ulong tmp;
! 225:
1.1 root 226: _regs->msr = 1 << MSR_PR; /* Set user mode */
227: _regs->gpr[1] = infop->start_stack;
228: _regs->nip = infop->entry;
1.1.1.4 ! root 229: /* Note that isn't exactly what regular kernel does
! 230: * but this is what the ABI wants and is needed to allow
! 231: * execution of PPC BSD programs.
! 232: */
! 233: _regs->gpr[3] = tgetl(pos);
! 234: pos += sizeof(target_ulong);
! 235: _regs->gpr[4] = pos;
! 236: for (tmp = 1; tmp != 0; pos += sizeof(target_ulong))
! 237: tmp = ldl(pos);
! 238: _regs->gpr[5] = pos;
1.1 root 239: }
240:
241: #define USE_ELF_CORE_DUMP
242: #define ELF_EXEC_PAGESIZE 4096
243:
244: #endif
245:
1.1.1.2 root 246: #ifdef TARGET_MIPS
247:
248: #define ELF_START_MMAP 0x80000000
249:
250: #define elf_check_arch(x) ( (x) == EM_MIPS )
251:
252: #define ELF_CLASS ELFCLASS32
253: #ifdef TARGET_WORDS_BIGENDIAN
254: #define ELF_DATA ELFDATA2MSB
255: #else
256: #define ELF_DATA ELFDATA2LSB
257: #endif
258: #define ELF_ARCH EM_MIPS
259:
260: static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop)
261: {
262: regs->cp0_status = CP0St_UM;
263: regs->cp0_epc = infop->entry;
264: regs->regs[29] = infop->start_stack;
265: }
266:
267: #endif /* TARGET_MIPS */
268:
1.1.1.3 root 269: #ifdef TARGET_SH4
270:
271: #define ELF_START_MMAP 0x80000000
272:
273: #define elf_check_arch(x) ( (x) == EM_SH )
274:
275: #define ELF_CLASS ELFCLASS32
276: #define ELF_DATA ELFDATA2LSB
277: #define ELF_ARCH EM_SH
278:
279: static inline void init_thread(struct target_pt_regs *regs, struct image_info *infop)
280: {
281: /* Check other registers XXXXX */
282: regs->pc = infop->entry;
283: regs->regs[15] = infop->start_stack - 16 * 4;
284: }
285:
286: #define USE_ELF_CORE_DUMP
287: #define ELF_EXEC_PAGESIZE 4096
288:
289: #endif
290:
1.1.1.2 root 291: #ifndef ELF_PLATFORM
292: #define ELF_PLATFORM (NULL)
293: #endif
294:
295: #ifndef ELF_HWCAP
296: #define ELF_HWCAP 0
297: #endif
298:
1.1 root 299: #include "elf.h"
300:
301: struct exec
302: {
303: unsigned int a_info; /* Use macros N_MAGIC, etc for access */
304: unsigned int a_text; /* length of text, in bytes */
305: unsigned int a_data; /* length of data, in bytes */
306: unsigned int a_bss; /* length of uninitialized data area, in bytes */
307: unsigned int a_syms; /* length of symbol table data in file, in bytes */
308: unsigned int a_entry; /* start address */
309: unsigned int a_trsize; /* length of relocation info for text, in bytes */
310: unsigned int a_drsize; /* length of relocation info for data, in bytes */
311: };
312:
313:
314: #define N_MAGIC(exec) ((exec).a_info & 0xffff)
315: #define OMAGIC 0407
316: #define NMAGIC 0410
317: #define ZMAGIC 0413
318: #define QMAGIC 0314
319:
320: /* max code+data+bss space allocated to elf interpreter */
321: #define INTERP_MAP_SIZE (32 * 1024 * 1024)
322:
323: /* max code+data+bss+brk space allocated to ET_DYN executables */
324: #define ET_DYN_MAP_SIZE (128 * 1024 * 1024)
325:
326: /* from personality.h */
327:
328: /* Flags for bug emulation. These occupy the top three bytes. */
329: #define STICKY_TIMEOUTS 0x4000000
330: #define WHOLE_SECONDS 0x2000000
331:
332: /* Personality types. These go in the low byte. Avoid using the top bit,
333: * it will conflict with error returns.
334: */
335: #define PER_MASK (0x00ff)
336: #define PER_LINUX (0x0000)
337: #define PER_SVR4 (0x0001 | STICKY_TIMEOUTS)
338: #define PER_SVR3 (0x0002 | STICKY_TIMEOUTS)
339: #define PER_SCOSVR3 (0x0003 | STICKY_TIMEOUTS | WHOLE_SECONDS)
340: #define PER_WYSEV386 (0x0004 | STICKY_TIMEOUTS)
341: #define PER_ISCR4 (0x0005 | STICKY_TIMEOUTS)
342: #define PER_BSD (0x0006)
343: #define PER_XENIX (0x0007 | STICKY_TIMEOUTS)
344:
345: /* Necessary parameters */
346: #define TARGET_ELF_EXEC_PAGESIZE TARGET_PAGE_SIZE
347: #define TARGET_ELF_PAGESTART(_v) ((_v) & ~(unsigned long)(TARGET_ELF_EXEC_PAGESIZE-1))
348: #define TARGET_ELF_PAGEOFFSET(_v) ((_v) & (TARGET_ELF_EXEC_PAGESIZE-1))
349:
350: #define INTERPRETER_NONE 0
351: #define INTERPRETER_AOUT 1
352: #define INTERPRETER_ELF 2
353:
1.1.1.2 root 354: #define DLINFO_ITEMS 12
1.1 root 355:
356: static inline void memcpy_fromfs(void * to, const void * from, unsigned long n)
357: {
358: memcpy(to, from, n);
359: }
360:
361: extern unsigned long x86_stack_size;
362:
363: static int load_aout_interp(void * exptr, int interp_fd);
364:
365: #ifdef BSWAP_NEEDED
366: static void bswap_ehdr(struct elfhdr *ehdr)
367: {
368: bswap16s(&ehdr->e_type); /* Object file type */
369: bswap16s(&ehdr->e_machine); /* Architecture */
370: bswap32s(&ehdr->e_version); /* Object file version */
371: bswaptls(&ehdr->e_entry); /* Entry point virtual address */
372: bswaptls(&ehdr->e_phoff); /* Program header table file offset */
373: bswaptls(&ehdr->e_shoff); /* Section header table file offset */
374: bswap32s(&ehdr->e_flags); /* Processor-specific flags */
375: bswap16s(&ehdr->e_ehsize); /* ELF header size in bytes */
376: bswap16s(&ehdr->e_phentsize); /* Program header table entry size */
377: bswap16s(&ehdr->e_phnum); /* Program header table entry count */
378: bswap16s(&ehdr->e_shentsize); /* Section header table entry size */
379: bswap16s(&ehdr->e_shnum); /* Section header table entry count */
380: bswap16s(&ehdr->e_shstrndx); /* Section header string table index */
381: }
382:
383: static void bswap_phdr(struct elf_phdr *phdr)
384: {
385: bswap32s(&phdr->p_type); /* Segment type */
386: bswaptls(&phdr->p_offset); /* Segment file offset */
387: bswaptls(&phdr->p_vaddr); /* Segment virtual address */
388: bswaptls(&phdr->p_paddr); /* Segment physical address */
389: bswaptls(&phdr->p_filesz); /* Segment size in file */
390: bswaptls(&phdr->p_memsz); /* Segment size in memory */
391: bswap32s(&phdr->p_flags); /* Segment flags */
392: bswaptls(&phdr->p_align); /* Segment alignment */
393: }
394:
395: static void bswap_shdr(struct elf_shdr *shdr)
396: {
397: bswap32s(&shdr->sh_name);
398: bswap32s(&shdr->sh_type);
399: bswaptls(&shdr->sh_flags);
400: bswaptls(&shdr->sh_addr);
401: bswaptls(&shdr->sh_offset);
402: bswaptls(&shdr->sh_size);
403: bswap32s(&shdr->sh_link);
404: bswap32s(&shdr->sh_info);
405: bswaptls(&shdr->sh_addralign);
406: bswaptls(&shdr->sh_entsize);
407: }
408:
409: static void bswap_sym(Elf32_Sym *sym)
410: {
411: bswap32s(&sym->st_name);
412: bswap32s(&sym->st_value);
413: bswap32s(&sym->st_size);
414: bswap16s(&sym->st_shndx);
415: }
416: #endif
417:
418: /*
1.1.1.4 ! root 419: * 'copy_elf_strings()' copies argument/envelope strings from user
1.1 root 420: * memory to free pages in kernel mem. These are in a format ready
421: * to be put directly into the top of new user memory.
422: *
423: */
1.1.1.4 ! root 424: static unsigned long copy_elf_strings(int argc,char ** argv, void **page,
! 425: unsigned long p)
1.1 root 426: {
427: char *tmp, *tmp1, *pag = NULL;
428: int len, offset = 0;
429:
430: if (!p) {
431: return 0; /* bullet-proofing */
432: }
433: while (argc-- > 0) {
434: tmp = argv[argc];
435: if (!tmp) {
436: fprintf(stderr, "VFS: argc is wrong");
437: exit(-1);
438: }
439: tmp1 = tmp;
440: while (*tmp++);
441: len = tmp - tmp1;
442: if (p < len) { /* this shouldn't happen - 128kB */
443: return 0;
444: }
445: while (len) {
446: --p; --tmp; --len;
447: if (--offset < 0) {
448: offset = p % TARGET_PAGE_SIZE;
1.1.1.3 root 449: pag = (char *)page[p/TARGET_PAGE_SIZE];
1.1 root 450: if (!pag) {
1.1.1.3 root 451: pag = (char *)malloc(TARGET_PAGE_SIZE);
452: page[p/TARGET_PAGE_SIZE] = pag;
1.1 root 453: if (!pag)
454: return 0;
455: }
456: }
457: if (len == 0 || offset == 0) {
458: *(pag + offset) = *tmp;
459: }
460: else {
461: int bytes_to_copy = (len > offset) ? offset : len;
462: tmp -= bytes_to_copy;
463: p -= bytes_to_copy;
464: offset -= bytes_to_copy;
465: len -= bytes_to_copy;
466: memcpy_fromfs(pag + offset, tmp, bytes_to_copy + 1);
467: }
468: }
469: }
470: return p;
471: }
472:
1.1.1.3 root 473: unsigned long setup_arg_pages(target_ulong p, struct linux_binprm * bprm,
474: struct image_info * info)
1.1 root 475: {
1.1.1.3 root 476: target_ulong stack_base, size, error;
1.1 root 477: int i;
478:
479: /* Create enough stack to hold everything. If we don't use
480: * it for args, we'll use it for something else...
481: */
482: size = x86_stack_size;
483: if (size < MAX_ARG_PAGES*TARGET_PAGE_SIZE)
484: size = MAX_ARG_PAGES*TARGET_PAGE_SIZE;
485: error = target_mmap(0,
486: size + qemu_host_page_size,
487: PROT_READ | PROT_WRITE,
488: MAP_PRIVATE | MAP_ANONYMOUS,
489: -1, 0);
490: if (error == -1) {
491: perror("stk mmap");
492: exit(-1);
493: }
494: /* we reserve one extra page at the top of the stack as guard */
495: target_mprotect(error + size, qemu_host_page_size, PROT_NONE);
496:
497: stack_base = error + size - MAX_ARG_PAGES*TARGET_PAGE_SIZE;
498: p += stack_base;
499:
500: for (i = 0 ; i < MAX_ARG_PAGES ; i++) {
501: if (bprm->page[i]) {
502: info->rss++;
503:
1.1.1.3 root 504: memcpy_to_target(stack_base, bprm->page[i], TARGET_PAGE_SIZE);
505: free(bprm->page[i]);
1.1 root 506: }
1.1.1.3 root 507: stack_base += TARGET_PAGE_SIZE;
1.1 root 508: }
509: return p;
510: }
511:
512: static void set_brk(unsigned long start, unsigned long end)
513: {
514: /* page-align the start and end addresses... */
515: start = HOST_PAGE_ALIGN(start);
516: end = HOST_PAGE_ALIGN(end);
517: if (end <= start)
518: return;
519: if(target_mmap(start, end - start,
520: PROT_READ | PROT_WRITE | PROT_EXEC,
521: MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS, -1, 0) == -1) {
522: perror("cannot mmap brk");
523: exit(-1);
524: }
525: }
526:
527:
528: /* We need to explicitly zero any fractional pages after the data
529: section (i.e. bss). This would contain the junk from the file that
530: should not be in memory. */
531: static void padzero(unsigned long elf_bss)
532: {
533: unsigned long nbyte;
534:
535: /* XXX: this is really a hack : if the real host page size is
536: smaller than the target page size, some pages after the end
537: of the file may not be mapped. A better fix would be to
538: patch target_mmap(), but it is more complicated as the file
539: size must be known */
540: if (qemu_real_host_page_size < qemu_host_page_size) {
541: unsigned long end_addr, end_addr1;
542: end_addr1 = (elf_bss + qemu_real_host_page_size - 1) &
543: ~(qemu_real_host_page_size - 1);
544: end_addr = HOST_PAGE_ALIGN(elf_bss);
545: if (end_addr1 < end_addr) {
546: mmap((void *)end_addr1, end_addr - end_addr1,
547: PROT_READ|PROT_WRITE|PROT_EXEC,
548: MAP_FIXED|MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
549: }
550: }
551:
552: nbyte = elf_bss & (qemu_host_page_size-1);
553: if (nbyte) {
554: nbyte = qemu_host_page_size - nbyte;
555: do {
1.1.1.3 root 556: tput8(elf_bss, 0);
557: elf_bss++;
1.1 root 558: } while (--nbyte);
559: }
560: }
561:
1.1.1.3 root 562:
563: static unsigned long create_elf_tables(target_ulong p, int argc, int envc,
564: struct elfhdr * exec,
565: unsigned long load_addr,
566: unsigned long load_bias,
567: unsigned long interp_load_addr, int ibcs,
568: struct image_info *info)
569: {
570: target_ulong sp;
571: int size;
572: target_ulong u_platform;
1.1.1.2 root 573: const char *k_platform;
1.1.1.3 root 574: const int n = sizeof(target_ulong);
1.1 root 575:
1.1.1.3 root 576: sp = p;
577: u_platform = 0;
1.1.1.2 root 578: k_platform = ELF_PLATFORM;
579: if (k_platform) {
580: size_t len = strlen(k_platform) + 1;
1.1.1.3 root 581: sp -= (len + n - 1) & ~(n - 1);
582: u_platform = sp;
583: memcpy_to_target(sp, k_platform, len);
1.1.1.2 root 584: }
1.1.1.3 root 585: /*
586: * Force 16 byte _final_ alignment here for generality.
587: */
588: sp = sp &~ (target_ulong)15;
589: size = (DLINFO_ITEMS + 1) * 2;
1.1.1.2 root 590: if (k_platform)
1.1.1.3 root 591: size += 2;
1.1 root 592: #ifdef DLINFO_ARCH_ITEMS
1.1.1.3 root 593: size += DLINFO_ARCH_ITEMS * 2;
1.1 root 594: #endif
1.1.1.3 root 595: size += envc + argc + 2;
596: size += (!ibcs ? 3 : 1); /* argc itself */
597: size *= n;
598: if (size & 15)
599: sp -= 16 - (size & 15);
1.1 root 600:
1.1.1.3 root 601: #define NEW_AUX_ENT(id, val) do { \
602: sp -= n; tputl(sp, val); \
603: sp -= n; tputl(sp, id); \
604: } while(0)
1.1 root 605: NEW_AUX_ENT (AT_NULL, 0);
606:
607: /* There must be exactly DLINFO_ITEMS entries here. */
608: NEW_AUX_ENT(AT_PHDR, (target_ulong)(load_addr + exec->e_phoff));
609: NEW_AUX_ENT(AT_PHENT, (target_ulong)(sizeof (struct elf_phdr)));
610: NEW_AUX_ENT(AT_PHNUM, (target_ulong)(exec->e_phnum));
611: NEW_AUX_ENT(AT_PAGESZ, (target_ulong)(TARGET_PAGE_SIZE));
612: NEW_AUX_ENT(AT_BASE, (target_ulong)(interp_load_addr));
613: NEW_AUX_ENT(AT_FLAGS, (target_ulong)0);
614: NEW_AUX_ENT(AT_ENTRY, load_bias + exec->e_entry);
615: NEW_AUX_ENT(AT_UID, (target_ulong) getuid());
616: NEW_AUX_ENT(AT_EUID, (target_ulong) geteuid());
617: NEW_AUX_ENT(AT_GID, (target_ulong) getgid());
618: NEW_AUX_ENT(AT_EGID, (target_ulong) getegid());
1.1.1.2 root 619: NEW_AUX_ENT(AT_HWCAP, (target_ulong) ELF_HWCAP);
620: if (k_platform)
1.1.1.3 root 621: NEW_AUX_ENT(AT_PLATFORM, u_platform);
1.1 root 622: #ifdef ARCH_DLINFO
623: /*
624: * ARCH_DLINFO must come last so platform specific code can enforce
625: * special alignment requirements on the AUXV if necessary (eg. PPC).
626: */
627: ARCH_DLINFO;
628: #endif
629: #undef NEW_AUX_ENT
630:
1.1.1.4 ! root 631: sp = loader_build_argptr(envc, argc, sp, p, !ibcs);
1.1 root 632: return sp;
633: }
634:
635:
636: static unsigned long load_elf_interp(struct elfhdr * interp_elf_ex,
637: int interpreter_fd,
638: unsigned long *interp_load_addr)
639: {
640: struct elf_phdr *elf_phdata = NULL;
641: struct elf_phdr *eppnt;
642: unsigned long load_addr = 0;
643: int load_addr_set = 0;
644: int retval;
645: unsigned long last_bss, elf_bss;
646: unsigned long error;
647: int i;
648:
649: elf_bss = 0;
650: last_bss = 0;
651: error = 0;
652:
653: #ifdef BSWAP_NEEDED
654: bswap_ehdr(interp_elf_ex);
655: #endif
656: /* First of all, some simple consistency checks */
657: if ((interp_elf_ex->e_type != ET_EXEC &&
658: interp_elf_ex->e_type != ET_DYN) ||
659: !elf_check_arch(interp_elf_ex->e_machine)) {
660: return ~0UL;
661: }
662:
663:
664: /* Now read in all of the header information */
665:
666: if (sizeof(struct elf_phdr) * interp_elf_ex->e_phnum > TARGET_PAGE_SIZE)
667: return ~0UL;
668:
669: elf_phdata = (struct elf_phdr *)
670: malloc(sizeof(struct elf_phdr) * interp_elf_ex->e_phnum);
671:
672: if (!elf_phdata)
673: return ~0UL;
674:
675: /*
676: * If the size of this structure has changed, then punt, since
677: * we will be doing the wrong thing.
678: */
679: if (interp_elf_ex->e_phentsize != sizeof(struct elf_phdr)) {
680: free(elf_phdata);
681: return ~0UL;
682: }
683:
684: retval = lseek(interpreter_fd, interp_elf_ex->e_phoff, SEEK_SET);
685: if(retval >= 0) {
686: retval = read(interpreter_fd,
687: (char *) elf_phdata,
688: sizeof(struct elf_phdr) * interp_elf_ex->e_phnum);
689: }
690: if (retval < 0) {
691: perror("load_elf_interp");
692: exit(-1);
693: free (elf_phdata);
694: return retval;
695: }
696: #ifdef BSWAP_NEEDED
697: eppnt = elf_phdata;
698: for (i=0; i<interp_elf_ex->e_phnum; i++, eppnt++) {
699: bswap_phdr(eppnt);
700: }
701: #endif
702:
703: if (interp_elf_ex->e_type == ET_DYN) {
704: /* in order to avoid harcoding the interpreter load
705: address in qemu, we allocate a big enough memory zone */
706: error = target_mmap(0, INTERP_MAP_SIZE,
707: PROT_NONE, MAP_PRIVATE | MAP_ANON,
708: -1, 0);
709: if (error == -1) {
710: perror("mmap");
711: exit(-1);
712: }
713: load_addr = error;
714: load_addr_set = 1;
715: }
716:
717: eppnt = elf_phdata;
718: for(i=0; i<interp_elf_ex->e_phnum; i++, eppnt++)
719: if (eppnt->p_type == PT_LOAD) {
720: int elf_type = MAP_PRIVATE | MAP_DENYWRITE;
721: int elf_prot = 0;
722: unsigned long vaddr = 0;
723: unsigned long k;
724:
725: if (eppnt->p_flags & PF_R) elf_prot = PROT_READ;
726: if (eppnt->p_flags & PF_W) elf_prot |= PROT_WRITE;
727: if (eppnt->p_flags & PF_X) elf_prot |= PROT_EXEC;
728: if (interp_elf_ex->e_type == ET_EXEC || load_addr_set) {
729: elf_type |= MAP_FIXED;
730: vaddr = eppnt->p_vaddr;
731: }
732: error = target_mmap(load_addr+TARGET_ELF_PAGESTART(vaddr),
733: eppnt->p_filesz + TARGET_ELF_PAGEOFFSET(eppnt->p_vaddr),
734: elf_prot,
735: elf_type,
736: interpreter_fd,
737: eppnt->p_offset - TARGET_ELF_PAGEOFFSET(eppnt->p_vaddr));
738:
1.1.1.3 root 739: if (error == -1) {
1.1 root 740: /* Real error */
741: close(interpreter_fd);
742: free(elf_phdata);
743: return ~0UL;
744: }
745:
746: if (!load_addr_set && interp_elf_ex->e_type == ET_DYN) {
747: load_addr = error;
748: load_addr_set = 1;
749: }
750:
751: /*
752: * Find the end of the file mapping for this phdr, and keep
753: * track of the largest address we see for this.
754: */
755: k = load_addr + eppnt->p_vaddr + eppnt->p_filesz;
756: if (k > elf_bss) elf_bss = k;
757:
758: /*
759: * Do the same thing for the memory mapping - between
760: * elf_bss and last_bss is the bss section.
761: */
762: k = load_addr + eppnt->p_memsz + eppnt->p_vaddr;
763: if (k > last_bss) last_bss = k;
764: }
765:
766: /* Now use mmap to map the library into memory. */
767:
768: close(interpreter_fd);
769:
770: /*
771: * Now fill out the bss section. First pad the last page up
772: * to the page boundary, and then perform a mmap to make sure
773: * that there are zeromapped pages up to and including the last
774: * bss page.
775: */
776: padzero(elf_bss);
777: elf_bss = TARGET_ELF_PAGESTART(elf_bss + qemu_host_page_size - 1); /* What we have mapped so far */
778:
779: /* Map the last of the bss segment */
780: if (last_bss > elf_bss) {
781: target_mmap(elf_bss, last_bss-elf_bss,
782: PROT_READ|PROT_WRITE|PROT_EXEC,
783: MAP_FIXED|MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
784: }
785: free(elf_phdata);
786:
787: *interp_load_addr = load_addr;
788: return ((unsigned long) interp_elf_ex->e_entry) + load_addr;
789: }
790:
791: /* Best attempt to load symbols from this ELF object. */
792: static void load_symbols(struct elfhdr *hdr, int fd)
793: {
794: unsigned int i;
795: struct elf_shdr sechdr, symtab, strtab;
796: char *strings;
797: struct syminfo *s;
798:
799: lseek(fd, hdr->e_shoff, SEEK_SET);
800: for (i = 0; i < hdr->e_shnum; i++) {
801: if (read(fd, &sechdr, sizeof(sechdr)) != sizeof(sechdr))
802: return;
803: #ifdef BSWAP_NEEDED
804: bswap_shdr(&sechdr);
805: #endif
806: if (sechdr.sh_type == SHT_SYMTAB) {
807: symtab = sechdr;
808: lseek(fd, hdr->e_shoff
809: + sizeof(sechdr) * sechdr.sh_link, SEEK_SET);
810: if (read(fd, &strtab, sizeof(strtab))
811: != sizeof(strtab))
812: return;
813: #ifdef BSWAP_NEEDED
814: bswap_shdr(&strtab);
815: #endif
816: goto found;
817: }
818: }
819: return; /* Shouldn't happen... */
820:
821: found:
822: /* Now know where the strtab and symtab are. Snarf them. */
823: s = malloc(sizeof(*s));
824: s->disas_symtab = malloc(symtab.sh_size);
825: s->disas_strtab = strings = malloc(strtab.sh_size);
826: if (!s->disas_symtab || !s->disas_strtab)
827: return;
828:
829: lseek(fd, symtab.sh_offset, SEEK_SET);
830: if (read(fd, s->disas_symtab, symtab.sh_size) != symtab.sh_size)
831: return;
832:
833: #ifdef BSWAP_NEEDED
834: for (i = 0; i < symtab.sh_size / sizeof(struct elf_sym); i++)
835: bswap_sym(s->disas_symtab + sizeof(struct elf_sym)*i);
836: #endif
837:
838: lseek(fd, strtab.sh_offset, SEEK_SET);
839: if (read(fd, strings, strtab.sh_size) != strtab.sh_size)
840: return;
841: s->disas_num_syms = symtab.sh_size / sizeof(struct elf_sym);
842: s->next = syminfos;
843: syminfos = s;
844: }
845:
1.1.1.4 ! root 846: int load_elf_binary(struct linux_binprm * bprm, struct target_pt_regs * regs,
! 847: struct image_info * info)
1.1 root 848: {
849: struct elfhdr elf_ex;
850: struct elfhdr interp_elf_ex;
851: struct exec interp_ex;
852: int interpreter_fd = -1; /* avoid warning */
853: unsigned long load_addr, load_bias;
854: int load_addr_set = 0;
855: unsigned int interpreter_type = INTERPRETER_NONE;
856: unsigned char ibcs2_interpreter;
857: int i;
858: unsigned long mapped_addr;
859: struct elf_phdr * elf_ppnt;
860: struct elf_phdr *elf_phdata;
861: unsigned long elf_bss, k, elf_brk;
862: int retval;
863: char * elf_interpreter;
864: unsigned long elf_entry, interp_load_addr = 0;
865: int status;
866: unsigned long start_code, end_code, end_data;
867: unsigned long elf_stack;
868: char passed_fileno[6];
869:
870: ibcs2_interpreter = 0;
871: status = 0;
872: load_addr = 0;
873: load_bias = 0;
874: elf_ex = *((struct elfhdr *) bprm->buf); /* exec-header */
875: #ifdef BSWAP_NEEDED
876: bswap_ehdr(&elf_ex);
877: #endif
878:
879: /* First of all, some simple consistency checks */
880: if ((elf_ex.e_type != ET_EXEC && elf_ex.e_type != ET_DYN) ||
881: (! elf_check_arch(elf_ex.e_machine))) {
882: return -ENOEXEC;
883: }
884:
1.1.1.4 ! root 885: bprm->p = copy_elf_strings(1, &bprm->filename, bprm->page, bprm->p);
! 886: bprm->p = copy_elf_strings(bprm->envc,bprm->envp,bprm->page,bprm->p);
! 887: bprm->p = copy_elf_strings(bprm->argc,bprm->argv,bprm->page,bprm->p);
! 888: if (!bprm->p) {
! 889: retval = -E2BIG;
! 890: }
! 891:
1.1 root 892: /* Now read in all of the header information */
893: elf_phdata = (struct elf_phdr *)malloc(elf_ex.e_phentsize*elf_ex.e_phnum);
894: if (elf_phdata == NULL) {
895: return -ENOMEM;
896: }
897:
898: retval = lseek(bprm->fd, elf_ex.e_phoff, SEEK_SET);
899: if(retval > 0) {
900: retval = read(bprm->fd, (char *) elf_phdata,
901: elf_ex.e_phentsize * elf_ex.e_phnum);
902: }
903:
904: if (retval < 0) {
905: perror("load_elf_binary");
906: exit(-1);
907: free (elf_phdata);
908: return -errno;
909: }
910:
911: #ifdef BSWAP_NEEDED
912: elf_ppnt = elf_phdata;
913: for (i=0; i<elf_ex.e_phnum; i++, elf_ppnt++) {
914: bswap_phdr(elf_ppnt);
915: }
916: #endif
917: elf_ppnt = elf_phdata;
918:
919: elf_bss = 0;
920: elf_brk = 0;
921:
922:
923: elf_stack = ~0UL;
924: elf_interpreter = NULL;
925: start_code = ~0UL;
926: end_code = 0;
927: end_data = 0;
928:
929: for(i=0;i < elf_ex.e_phnum; i++) {
930: if (elf_ppnt->p_type == PT_INTERP) {
931: if ( elf_interpreter != NULL )
932: {
933: free (elf_phdata);
934: free(elf_interpreter);
935: close(bprm->fd);
936: return -EINVAL;
937: }
938:
939: /* This is the program interpreter used for
940: * shared libraries - for now assume that this
941: * is an a.out format binary
942: */
943:
944: elf_interpreter = (char *)malloc(elf_ppnt->p_filesz);
945:
946: if (elf_interpreter == NULL) {
947: free (elf_phdata);
948: close(bprm->fd);
949: return -ENOMEM;
950: }
951:
952: retval = lseek(bprm->fd, elf_ppnt->p_offset, SEEK_SET);
953: if(retval >= 0) {
954: retval = read(bprm->fd, elf_interpreter, elf_ppnt->p_filesz);
955: }
956: if(retval < 0) {
957: perror("load_elf_binary2");
958: exit(-1);
959: }
960:
961: /* If the program interpreter is one of these two,
962: then assume an iBCS2 image. Otherwise assume
963: a native linux image. */
964:
965: /* JRP - Need to add X86 lib dir stuff here... */
966:
967: if (strcmp(elf_interpreter,"/usr/lib/libc.so.1") == 0 ||
968: strcmp(elf_interpreter,"/usr/lib/ld.so.1") == 0) {
969: ibcs2_interpreter = 1;
970: }
971:
972: #if 0
973: printf("Using ELF interpreter %s\n", elf_interpreter);
974: #endif
975: if (retval >= 0) {
976: retval = open(path(elf_interpreter), O_RDONLY);
977: if(retval >= 0) {
978: interpreter_fd = retval;
979: }
980: else {
981: perror(elf_interpreter);
982: exit(-1);
983: /* retval = -errno; */
984: }
985: }
986:
987: if (retval >= 0) {
988: retval = lseek(interpreter_fd, 0, SEEK_SET);
989: if(retval >= 0) {
990: retval = read(interpreter_fd,bprm->buf,128);
991: }
992: }
993: if (retval >= 0) {
994: interp_ex = *((struct exec *) bprm->buf); /* aout exec-header */
995: interp_elf_ex=*((struct elfhdr *) bprm->buf); /* elf exec-header */
996: }
997: if (retval < 0) {
998: perror("load_elf_binary3");
999: exit(-1);
1000: free (elf_phdata);
1001: free(elf_interpreter);
1002: close(bprm->fd);
1003: return retval;
1004: }
1005: }
1006: elf_ppnt++;
1007: }
1008:
1009: /* Some simple consistency checks for the interpreter */
1010: if (elf_interpreter){
1011: interpreter_type = INTERPRETER_ELF | INTERPRETER_AOUT;
1012:
1013: /* Now figure out which format our binary is */
1014: if ((N_MAGIC(interp_ex) != OMAGIC) && (N_MAGIC(interp_ex) != ZMAGIC) &&
1015: (N_MAGIC(interp_ex) != QMAGIC)) {
1016: interpreter_type = INTERPRETER_ELF;
1017: }
1018:
1019: if (interp_elf_ex.e_ident[0] != 0x7f ||
1020: strncmp(&interp_elf_ex.e_ident[1], "ELF",3) != 0) {
1021: interpreter_type &= ~INTERPRETER_ELF;
1022: }
1023:
1024: if (!interpreter_type) {
1025: free(elf_interpreter);
1026: free(elf_phdata);
1027: close(bprm->fd);
1028: return -ELIBBAD;
1029: }
1030: }
1031:
1032: /* OK, we are done with that, now set up the arg stuff,
1033: and then start this sucker up */
1034:
1.1.1.4 ! root 1035: {
1.1 root 1036: char * passed_p;
1037:
1038: if (interpreter_type == INTERPRETER_AOUT) {
1039: snprintf(passed_fileno, sizeof(passed_fileno), "%d", bprm->fd);
1040: passed_p = passed_fileno;
1041:
1042: if (elf_interpreter) {
1.1.1.4 ! root 1043: bprm->p = copy_elf_strings(1,&passed_p,bprm->page,bprm->p);
1.1 root 1044: bprm->argc++;
1045: }
1046: }
1047: if (!bprm->p) {
1048: if (elf_interpreter) {
1049: free(elf_interpreter);
1050: }
1051: free (elf_phdata);
1052: close(bprm->fd);
1053: return -E2BIG;
1054: }
1055: }
1056:
1057: /* OK, This is the point of no return */
1058: info->end_data = 0;
1059: info->end_code = 0;
1060: info->start_mmap = (unsigned long)ELF_START_MMAP;
1061: info->mmap = 0;
1062: elf_entry = (unsigned long) elf_ex.e_entry;
1063:
1064: /* Do this so that we can load the interpreter, if need be. We will
1065: change some of these later */
1066: info->rss = 0;
1067: bprm->p = setup_arg_pages(bprm->p, bprm, info);
1068: info->start_stack = bprm->p;
1069:
1070: /* Now we do a little grungy work by mmaping the ELF image into
1071: * the correct location in memory. At this point, we assume that
1072: * the image should be loaded at fixed address, not at a variable
1073: * address.
1074: */
1075:
1076: for(i = 0, elf_ppnt = elf_phdata; i < elf_ex.e_phnum; i++, elf_ppnt++) {
1077: int elf_prot = 0;
1078: int elf_flags = 0;
1079: unsigned long error;
1080:
1081: if (elf_ppnt->p_type != PT_LOAD)
1082: continue;
1083:
1084: if (elf_ppnt->p_flags & PF_R) elf_prot |= PROT_READ;
1085: if (elf_ppnt->p_flags & PF_W) elf_prot |= PROT_WRITE;
1086: if (elf_ppnt->p_flags & PF_X) elf_prot |= PROT_EXEC;
1087: elf_flags = MAP_PRIVATE | MAP_DENYWRITE;
1088: if (elf_ex.e_type == ET_EXEC || load_addr_set) {
1089: elf_flags |= MAP_FIXED;
1090: } else if (elf_ex.e_type == ET_DYN) {
1091: /* Try and get dynamic programs out of the way of the default mmap
1092: base, as well as whatever program they might try to exec. This
1093: is because the brk will follow the loader, and is not movable. */
1094: /* NOTE: for qemu, we do a big mmap to get enough space
1095: without harcoding any address */
1096: error = target_mmap(0, ET_DYN_MAP_SIZE,
1097: PROT_NONE, MAP_PRIVATE | MAP_ANON,
1098: -1, 0);
1099: if (error == -1) {
1100: perror("mmap");
1101: exit(-1);
1102: }
1103: load_bias = TARGET_ELF_PAGESTART(error - elf_ppnt->p_vaddr);
1104: }
1105:
1106: error = target_mmap(TARGET_ELF_PAGESTART(load_bias + elf_ppnt->p_vaddr),
1107: (elf_ppnt->p_filesz +
1108: TARGET_ELF_PAGEOFFSET(elf_ppnt->p_vaddr)),
1109: elf_prot,
1110: (MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE),
1111: bprm->fd,
1112: (elf_ppnt->p_offset -
1113: TARGET_ELF_PAGEOFFSET(elf_ppnt->p_vaddr)));
1114: if (error == -1) {
1115: perror("mmap");
1116: exit(-1);
1117: }
1118:
1119: #ifdef LOW_ELF_STACK
1120: if (TARGET_ELF_PAGESTART(elf_ppnt->p_vaddr) < elf_stack)
1121: elf_stack = TARGET_ELF_PAGESTART(elf_ppnt->p_vaddr);
1122: #endif
1123:
1124: if (!load_addr_set) {
1125: load_addr_set = 1;
1126: load_addr = elf_ppnt->p_vaddr - elf_ppnt->p_offset;
1127: if (elf_ex.e_type == ET_DYN) {
1128: load_bias += error -
1129: TARGET_ELF_PAGESTART(load_bias + elf_ppnt->p_vaddr);
1130: load_addr += load_bias;
1131: }
1132: }
1133: k = elf_ppnt->p_vaddr;
1134: if (k < start_code)
1135: start_code = k;
1136: k = elf_ppnt->p_vaddr + elf_ppnt->p_filesz;
1137: if (k > elf_bss)
1138: elf_bss = k;
1139: if ((elf_ppnt->p_flags & PF_X) && end_code < k)
1140: end_code = k;
1141: if (end_data < k)
1142: end_data = k;
1143: k = elf_ppnt->p_vaddr + elf_ppnt->p_memsz;
1144: if (k > elf_brk) elf_brk = k;
1145: }
1146:
1147: elf_entry += load_bias;
1148: elf_bss += load_bias;
1149: elf_brk += load_bias;
1150: start_code += load_bias;
1151: end_code += load_bias;
1152: // start_data += load_bias;
1153: end_data += load_bias;
1154:
1155: if (elf_interpreter) {
1156: if (interpreter_type & 1) {
1157: elf_entry = load_aout_interp(&interp_ex, interpreter_fd);
1158: }
1159: else if (interpreter_type & 2) {
1160: elf_entry = load_elf_interp(&interp_elf_ex, interpreter_fd,
1161: &interp_load_addr);
1162: }
1163:
1164: close(interpreter_fd);
1165: free(elf_interpreter);
1166:
1167: if (elf_entry == ~0UL) {
1168: printf("Unable to load interpreter\n");
1169: free(elf_phdata);
1170: exit(-1);
1171: return 0;
1172: }
1173: }
1174:
1175: free(elf_phdata);
1176:
1177: if (loglevel)
1178: load_symbols(&elf_ex, bprm->fd);
1179:
1180: if (interpreter_type != INTERPRETER_AOUT) close(bprm->fd);
1181: info->personality = (ibcs2_interpreter ? PER_SVR4 : PER_LINUX);
1182:
1183: #ifdef LOW_ELF_STACK
1184: info->start_stack = bprm->p = elf_stack - 4;
1185: #endif
1.1.1.3 root 1186: bprm->p = create_elf_tables(bprm->p,
1.1 root 1187: bprm->argc,
1188: bprm->envc,
1189: &elf_ex,
1190: load_addr, load_bias,
1191: interp_load_addr,
1192: (interpreter_type == INTERPRETER_AOUT ? 0 : 1),
1193: info);
1194: info->start_brk = info->brk = elf_brk;
1195: info->end_code = end_code;
1196: info->start_code = start_code;
1.1.1.4 ! root 1197: info->start_data = end_code;
1.1 root 1198: info->end_data = end_data;
1199: info->start_stack = bprm->p;
1200:
1201: /* Calling set_brk effectively mmaps the pages that we need for the bss and break
1202: sections */
1203: set_brk(elf_bss, elf_brk);
1204:
1205: padzero(elf_bss);
1206:
1207: #if 0
1208: printf("(start_brk) %x\n" , info->start_brk);
1209: printf("(end_code) %x\n" , info->end_code);
1210: printf("(start_code) %x\n" , info->start_code);
1211: printf("(end_data) %x\n" , info->end_data);
1212: printf("(start_stack) %x\n" , info->start_stack);
1213: printf("(brk) %x\n" , info->brk);
1214: #endif
1215:
1216: if ( info->personality == PER_SVR4 )
1217: {
1218: /* Why this, you ask??? Well SVr4 maps page 0 as read-only,
1219: and some applications "depend" upon this behavior.
1220: Since we do not have the power to recompile these, we
1221: emulate the SVr4 behavior. Sigh. */
1222: mapped_addr = target_mmap(0, qemu_host_page_size, PROT_READ | PROT_EXEC,
1223: MAP_FIXED | MAP_PRIVATE, -1, 0);
1224: }
1225:
1226: info->entry = elf_entry;
1227:
1228: return 0;
1229: }
1230:
1231: static int load_aout_interp(void * exptr, int interp_fd)
1232: {
1233: printf("a.out interpreter not yet supported\n");
1234: return(0);
1235: }
1236:
1.1.1.4 ! root 1237: void do_init_thread(struct target_pt_regs *regs, struct image_info *infop)
! 1238: {
! 1239: init_thread(regs, infop);
! 1240: }
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