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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;
1.1.1.3 ! root 129: if (bsd_type == target_freebsd) {
! 130: regs->rdi = infop->start_stack;
! 131: }
1.1 root 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;
1.1.1.3 ! root 255: else {
1.1 root 256: regs->u_regs[14] = infop->start_stack - 16 * 8 - STACK_BIAS;
1.1.1.3 ! root 257: if (bsd_type == target_freebsd) {
! 258: regs->u_regs[8] = infop->start_stack;
! 259: regs->u_regs[11] = infop->start_stack;
! 260: }
! 261: }
1.1 root 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:
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);
1.1.1.2 root 1023: if (sym != NULL) {
1.1 root 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;
1047: struct elf_sym *syms;
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);
1075: if (!syms)
1076: return;
1077: s->disas_strtab = strings = malloc(strtab.sh_size);
1078: if (!s->disas_strtab)
1079: return;
1080:
1081: lseek(fd, symtab.sh_offset, SEEK_SET);
1082: if (read(fd, syms, symtab.sh_size) != symtab.sh_size)
1083: return;
1084:
1085: nsyms = symtab.sh_size / sizeof(struct elf_sym);
1086:
1087: i = 0;
1088: while (i < nsyms) {
1089: #ifdef BSWAP_NEEDED
1090: bswap_sym(syms + i);
1091: #endif
1092: // Throw away entries which we do not need.
1093: if (syms[i].st_shndx == SHN_UNDEF ||
1094: syms[i].st_shndx >= SHN_LORESERVE ||
1095: ELF_ST_TYPE(syms[i].st_info) != STT_FUNC) {
1096: nsyms--;
1097: if (i < nsyms) {
1098: syms[i] = syms[nsyms];
1099: }
1100: continue;
1101: }
1102: #if defined(TARGET_ARM) || defined (TARGET_MIPS)
1103: /* The bottom address bit marks a Thumb or MIPS16 symbol. */
1104: syms[i].st_value &= ~(target_ulong)1;
1105: #endif
1106: i++;
1107: }
1108: syms = realloc(syms, nsyms * sizeof(*syms));
1109:
1110: qsort(syms, nsyms, sizeof(*syms), symcmp);
1111:
1112: lseek(fd, strtab.sh_offset, SEEK_SET);
1113: if (read(fd, strings, strtab.sh_size) != strtab.sh_size)
1114: return;
1115: s->disas_num_syms = nsyms;
1116: #if ELF_CLASS == ELFCLASS32
1117: s->disas_symtab.elf32 = syms;
1.1.1.3 ! root 1118: s->lookup_symbol = (lookup_symbol_t)lookup_symbolxx;
1.1 root 1119: #else
1120: s->disas_symtab.elf64 = syms;
1.1.1.3 ! root 1121: s->lookup_symbol = (lookup_symbol_t)lookup_symbolxx;
1.1 root 1122: #endif
1123: s->next = syminfos;
1124: syminfos = s;
1125: }
1126:
1127: int load_elf_binary(struct linux_binprm * bprm, struct target_pt_regs * regs,
1128: struct image_info * info)
1129: {
1130: struct elfhdr elf_ex;
1131: struct elfhdr interp_elf_ex;
1132: struct exec interp_ex;
1133: int interpreter_fd = -1; /* avoid warning */
1134: abi_ulong load_addr, load_bias;
1135: int load_addr_set = 0;
1136: unsigned int interpreter_type = INTERPRETER_NONE;
1137: unsigned char ibcs2_interpreter;
1138: int i;
1139: abi_ulong mapped_addr;
1140: struct elf_phdr * elf_ppnt;
1141: struct elf_phdr *elf_phdata;
1142: abi_ulong elf_bss, k, elf_brk;
1143: int retval;
1144: char * elf_interpreter;
1145: abi_ulong elf_entry, interp_load_addr = 0;
1146: int status;
1147: abi_ulong start_code, end_code, start_data, end_data;
1148: abi_ulong reloc_func_desc = 0;
1149: abi_ulong elf_stack;
1150: char passed_fileno[6];
1151:
1152: ibcs2_interpreter = 0;
1153: status = 0;
1154: load_addr = 0;
1155: load_bias = 0;
1156: elf_ex = *((struct elfhdr *) bprm->buf); /* exec-header */
1157: #ifdef BSWAP_NEEDED
1158: bswap_ehdr(&elf_ex);
1159: #endif
1160:
1161: /* First of all, some simple consistency checks */
1162: if ((elf_ex.e_type != ET_EXEC && elf_ex.e_type != ET_DYN) ||
1163: (! elf_check_arch(elf_ex.e_machine))) {
1164: return -ENOEXEC;
1165: }
1166:
1167: bprm->p = copy_elf_strings(1, &bprm->filename, bprm->page, bprm->p);
1168: bprm->p = copy_elf_strings(bprm->envc,bprm->envp,bprm->page,bprm->p);
1169: bprm->p = copy_elf_strings(bprm->argc,bprm->argv,bprm->page,bprm->p);
1170: if (!bprm->p) {
1171: retval = -E2BIG;
1172: }
1173:
1174: /* Now read in all of the header information */
1175: elf_phdata = (struct elf_phdr *)malloc(elf_ex.e_phentsize*elf_ex.e_phnum);
1176: if (elf_phdata == NULL) {
1177: return -ENOMEM;
1178: }
1179:
1180: retval = lseek(bprm->fd, elf_ex.e_phoff, SEEK_SET);
1181: if(retval > 0) {
1182: retval = read(bprm->fd, (char *) elf_phdata,
1183: elf_ex.e_phentsize * elf_ex.e_phnum);
1184: }
1185:
1186: if (retval < 0) {
1187: perror("load_elf_binary");
1188: exit(-1);
1189: free (elf_phdata);
1190: return -errno;
1191: }
1192:
1193: #ifdef BSWAP_NEEDED
1194: elf_ppnt = elf_phdata;
1195: for (i=0; i<elf_ex.e_phnum; i++, elf_ppnt++) {
1196: bswap_phdr(elf_ppnt);
1197: }
1198: #endif
1199: elf_ppnt = elf_phdata;
1200:
1201: elf_bss = 0;
1202: elf_brk = 0;
1203:
1204:
1205: elf_stack = ~((abi_ulong)0UL);
1206: elf_interpreter = NULL;
1207: start_code = ~((abi_ulong)0UL);
1208: end_code = 0;
1209: start_data = 0;
1210: end_data = 0;
1211: interp_ex.a_info = 0;
1212:
1213: for(i=0;i < elf_ex.e_phnum; i++) {
1214: if (elf_ppnt->p_type == PT_INTERP) {
1215: if ( elf_interpreter != NULL )
1216: {
1217: free (elf_phdata);
1218: free(elf_interpreter);
1219: close(bprm->fd);
1220: return -EINVAL;
1221: }
1222:
1223: /* This is the program interpreter used for
1224: * shared libraries - for now assume that this
1225: * is an a.out format binary
1226: */
1227:
1228: elf_interpreter = (char *)malloc(elf_ppnt->p_filesz);
1229:
1230: if (elf_interpreter == NULL) {
1231: free (elf_phdata);
1232: close(bprm->fd);
1233: return -ENOMEM;
1234: }
1235:
1236: retval = lseek(bprm->fd, elf_ppnt->p_offset, SEEK_SET);
1237: if(retval >= 0) {
1238: retval = read(bprm->fd, elf_interpreter, elf_ppnt->p_filesz);
1239: }
1240: if(retval < 0) {
1241: perror("load_elf_binary2");
1242: exit(-1);
1243: }
1244:
1245: /* If the program interpreter is one of these two,
1246: then assume an iBCS2 image. Otherwise assume
1247: a native linux image. */
1248:
1249: /* JRP - Need to add X86 lib dir stuff here... */
1250:
1251: if (strcmp(elf_interpreter,"/usr/lib/libc.so.1") == 0 ||
1252: strcmp(elf_interpreter,"/usr/lib/ld.so.1") == 0) {
1253: ibcs2_interpreter = 1;
1254: }
1255:
1256: #if 0
1.1.1.3 ! root 1257: printf("Using ELF interpreter %s\n", path(elf_interpreter));
1.1 root 1258: #endif
1259: if (retval >= 0) {
1260: retval = open(path(elf_interpreter), O_RDONLY);
1261: if(retval >= 0) {
1262: interpreter_fd = retval;
1263: }
1264: else {
1265: perror(elf_interpreter);
1266: exit(-1);
1267: /* retval = -errno; */
1268: }
1269: }
1270:
1271: if (retval >= 0) {
1272: retval = lseek(interpreter_fd, 0, SEEK_SET);
1273: if(retval >= 0) {
1274: retval = read(interpreter_fd,bprm->buf,128);
1275: }
1276: }
1277: if (retval >= 0) {
1278: interp_ex = *((struct exec *) bprm->buf); /* aout exec-header */
1.1.1.3 ! root 1279: interp_elf_ex = *((struct elfhdr *) bprm->buf); /* elf exec-header */
1.1 root 1280: }
1281: if (retval < 0) {
1282: perror("load_elf_binary3");
1283: exit(-1);
1284: free (elf_phdata);
1285: free(elf_interpreter);
1286: close(bprm->fd);
1287: return retval;
1288: }
1289: }
1290: elf_ppnt++;
1291: }
1292:
1293: /* Some simple consistency checks for the interpreter */
1294: if (elf_interpreter){
1295: interpreter_type = INTERPRETER_ELF | INTERPRETER_AOUT;
1296:
1297: /* Now figure out which format our binary is */
1298: if ((N_MAGIC(interp_ex) != OMAGIC) && (N_MAGIC(interp_ex) != ZMAGIC) &&
1299: (N_MAGIC(interp_ex) != QMAGIC)) {
1300: interpreter_type = INTERPRETER_ELF;
1301: }
1302:
1303: if (interp_elf_ex.e_ident[0] != 0x7f ||
1.1.1.2 root 1304: strncmp((char *)&interp_elf_ex.e_ident[1], "ELF",3) != 0) {
1.1 root 1305: interpreter_type &= ~INTERPRETER_ELF;
1306: }
1307:
1308: if (!interpreter_type) {
1309: free(elf_interpreter);
1310: free(elf_phdata);
1311: close(bprm->fd);
1312: return -ELIBBAD;
1313: }
1314: }
1315:
1316: /* OK, we are done with that, now set up the arg stuff,
1317: and then start this sucker up */
1318:
1319: {
1320: char * passed_p;
1321:
1322: if (interpreter_type == INTERPRETER_AOUT) {
1323: snprintf(passed_fileno, sizeof(passed_fileno), "%d", bprm->fd);
1324: passed_p = passed_fileno;
1325:
1326: if (elf_interpreter) {
1327: bprm->p = copy_elf_strings(1,&passed_p,bprm->page,bprm->p);
1328: bprm->argc++;
1329: }
1330: }
1331: if (!bprm->p) {
1332: if (elf_interpreter) {
1333: free(elf_interpreter);
1334: }
1335: free (elf_phdata);
1336: close(bprm->fd);
1337: return -E2BIG;
1338: }
1339: }
1340:
1341: /* OK, This is the point of no return */
1342: info->end_data = 0;
1343: info->end_code = 0;
1344: info->start_mmap = (abi_ulong)ELF_START_MMAP;
1345: info->mmap = 0;
1346: elf_entry = (abi_ulong) elf_ex.e_entry;
1347:
1.1.1.3 ! root 1348: #if defined(CONFIG_USE_GUEST_BASE)
! 1349: /*
! 1350: * In case where user has not explicitly set the guest_base, we
! 1351: * probe here that should we set it automatically.
! 1352: */
! 1353: if (!have_guest_base) {
! 1354: /*
! 1355: * Go through ELF program header table and find out whether
! 1356: * any of the segments drop below our current mmap_min_addr and
! 1357: * in that case set guest_base to corresponding address.
! 1358: */
! 1359: for (i = 0, elf_ppnt = elf_phdata; i < elf_ex.e_phnum;
! 1360: i++, elf_ppnt++) {
! 1361: if (elf_ppnt->p_type != PT_LOAD)
! 1362: continue;
! 1363: if (HOST_PAGE_ALIGN(elf_ppnt->p_vaddr) < mmap_min_addr) {
! 1364: guest_base = HOST_PAGE_ALIGN(mmap_min_addr);
! 1365: break;
! 1366: }
! 1367: }
! 1368: }
! 1369: #endif /* CONFIG_USE_GUEST_BASE */
! 1370:
1.1 root 1371: /* Do this so that we can load the interpreter, if need be. We will
1372: change some of these later */
1373: info->rss = 0;
1374: bprm->p = setup_arg_pages(bprm->p, bprm, info);
1375: info->start_stack = bprm->p;
1376:
1377: /* Now we do a little grungy work by mmaping the ELF image into
1378: * the correct location in memory. At this point, we assume that
1379: * the image should be loaded at fixed address, not at a variable
1380: * address.
1381: */
1382:
1383: for(i = 0, elf_ppnt = elf_phdata; i < elf_ex.e_phnum; i++, elf_ppnt++) {
1384: int elf_prot = 0;
1385: int elf_flags = 0;
1386: abi_ulong error;
1387:
1388: if (elf_ppnt->p_type != PT_LOAD)
1389: continue;
1390:
1391: if (elf_ppnt->p_flags & PF_R) elf_prot |= PROT_READ;
1392: if (elf_ppnt->p_flags & PF_W) elf_prot |= PROT_WRITE;
1393: if (elf_ppnt->p_flags & PF_X) elf_prot |= PROT_EXEC;
1394: elf_flags = MAP_PRIVATE | MAP_DENYWRITE;
1395: if (elf_ex.e_type == ET_EXEC || load_addr_set) {
1396: elf_flags |= MAP_FIXED;
1397: } else if (elf_ex.e_type == ET_DYN) {
1398: /* Try and get dynamic programs out of the way of the default mmap
1399: base, as well as whatever program they might try to exec. This
1400: is because the brk will follow the loader, and is not movable. */
1401: /* NOTE: for qemu, we do a big mmap to get enough space
1402: without hardcoding any address */
1403: error = target_mmap(0, ET_DYN_MAP_SIZE,
1404: PROT_NONE, MAP_PRIVATE | MAP_ANON,
1405: -1, 0);
1406: if (error == -1) {
1407: perror("mmap");
1408: exit(-1);
1409: }
1410: load_bias = TARGET_ELF_PAGESTART(error - elf_ppnt->p_vaddr);
1411: }
1412:
1413: error = target_mmap(TARGET_ELF_PAGESTART(load_bias + elf_ppnt->p_vaddr),
1414: (elf_ppnt->p_filesz +
1415: TARGET_ELF_PAGEOFFSET(elf_ppnt->p_vaddr)),
1416: elf_prot,
1417: (MAP_FIXED | MAP_PRIVATE | MAP_DENYWRITE),
1418: bprm->fd,
1419: (elf_ppnt->p_offset -
1420: TARGET_ELF_PAGEOFFSET(elf_ppnt->p_vaddr)));
1421: if (error == -1) {
1422: perror("mmap");
1423: exit(-1);
1424: }
1425:
1426: #ifdef LOW_ELF_STACK
1427: if (TARGET_ELF_PAGESTART(elf_ppnt->p_vaddr) < elf_stack)
1428: elf_stack = TARGET_ELF_PAGESTART(elf_ppnt->p_vaddr);
1429: #endif
1430:
1431: if (!load_addr_set) {
1432: load_addr_set = 1;
1433: load_addr = elf_ppnt->p_vaddr - elf_ppnt->p_offset;
1434: if (elf_ex.e_type == ET_DYN) {
1435: load_bias += error -
1436: TARGET_ELF_PAGESTART(load_bias + elf_ppnt->p_vaddr);
1437: load_addr += load_bias;
1438: reloc_func_desc = load_bias;
1439: }
1440: }
1441: k = elf_ppnt->p_vaddr;
1442: if (k < start_code)
1443: start_code = k;
1444: if (start_data < k)
1445: start_data = k;
1446: k = elf_ppnt->p_vaddr + elf_ppnt->p_filesz;
1447: if (k > elf_bss)
1448: elf_bss = k;
1449: if ((elf_ppnt->p_flags & PF_X) && end_code < k)
1450: end_code = k;
1451: if (end_data < k)
1452: end_data = k;
1453: k = elf_ppnt->p_vaddr + elf_ppnt->p_memsz;
1454: if (k > elf_brk) elf_brk = k;
1455: }
1456:
1457: elf_entry += load_bias;
1458: elf_bss += load_bias;
1459: elf_brk += load_bias;
1460: start_code += load_bias;
1461: end_code += load_bias;
1462: start_data += load_bias;
1463: end_data += load_bias;
1464:
1465: if (elf_interpreter) {
1466: if (interpreter_type & 1) {
1467: elf_entry = load_aout_interp(&interp_ex, interpreter_fd);
1468: }
1469: else if (interpreter_type & 2) {
1470: elf_entry = load_elf_interp(&interp_elf_ex, interpreter_fd,
1471: &interp_load_addr);
1472: }
1473: reloc_func_desc = interp_load_addr;
1474:
1475: close(interpreter_fd);
1476: free(elf_interpreter);
1477:
1478: if (elf_entry == ~((abi_ulong)0UL)) {
1479: printf("Unable to load interpreter\n");
1480: free(elf_phdata);
1481: exit(-1);
1482: return 0;
1483: }
1484: }
1485:
1486: free(elf_phdata);
1487:
1488: if (qemu_log_enabled())
1489: load_symbols(&elf_ex, bprm->fd);
1490:
1491: if (interpreter_type != INTERPRETER_AOUT) close(bprm->fd);
1492: info->personality = (ibcs2_interpreter ? PER_SVR4 : PER_LINUX);
1493:
1494: #ifdef LOW_ELF_STACK
1495: info->start_stack = bprm->p = elf_stack - 4;
1496: #endif
1497: bprm->p = create_elf_tables(bprm->p,
1498: bprm->argc,
1499: bprm->envc,
1500: &elf_ex,
1501: load_addr, load_bias,
1502: interp_load_addr,
1503: (interpreter_type == INTERPRETER_AOUT ? 0 : 1),
1504: info);
1505: info->load_addr = reloc_func_desc;
1506: info->start_brk = info->brk = elf_brk;
1507: info->end_code = end_code;
1508: info->start_code = start_code;
1509: info->start_data = start_data;
1510: info->end_data = end_data;
1511: info->start_stack = bprm->p;
1512:
1513: /* Calling set_brk effectively mmaps the pages that we need for the bss and break
1514: sections */
1515: set_brk(elf_bss, elf_brk);
1516:
1517: padzero(elf_bss, elf_brk);
1518:
1519: #if 0
1520: printf("(start_brk) %x\n" , info->start_brk);
1521: printf("(end_code) %x\n" , info->end_code);
1522: printf("(start_code) %x\n" , info->start_code);
1523: printf("(end_data) %x\n" , info->end_data);
1524: printf("(start_stack) %x\n" , info->start_stack);
1525: printf("(brk) %x\n" , info->brk);
1526: #endif
1527:
1528: if ( info->personality == PER_SVR4 )
1529: {
1530: /* Why this, you ask??? Well SVr4 maps page 0 as read-only,
1531: and some applications "depend" upon this behavior.
1532: Since we do not have the power to recompile these, we
1533: emulate the SVr4 behavior. Sigh. */
1534: mapped_addr = target_mmap(0, qemu_host_page_size, PROT_READ | PROT_EXEC,
1535: MAP_FIXED | MAP_PRIVATE, -1, 0);
1536: }
1537:
1538: info->entry = elf_entry;
1539:
1540: return 0;
1541: }
1542:
1543: static int load_aout_interp(void * exptr, int interp_fd)
1544: {
1545: printf("a.out interpreter not yet supported\n");
1546: return(0);
1547: }
1548:
1549: void do_init_thread(struct target_pt_regs *regs, struct image_info *infop)
1550: {
1551: init_thread(regs, infop);
1552: }
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