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